rustc_errors/emitter.rs
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387
//! The current rustc diagnostics emitter.
//!
//! An `Emitter` takes care of generating the output from a `Diag` struct.
//!
//! There are various `Emitter` implementations that generate different output formats such as
//! JSON and human readable output.
//!
//! The output types are defined in `rustc_session::config::ErrorOutputType`.
use std::borrow::Cow;
use std::cmp::{Reverse, max, min};
use std::error::Report;
use std::io::prelude::*;
use std::io::{self, IsTerminal};
use std::iter;
use std::path::Path;
use derive_setters::Setters;
use rustc_data_structures::fx::{FxHashMap, FxIndexMap, FxIndexSet};
use rustc_data_structures::sync::{DynSend, IntoDynSyncSend, Lrc};
use rustc_error_messages::{FluentArgs, SpanLabel};
use rustc_lint_defs::pluralize;
use rustc_span::hygiene::{ExpnKind, MacroKind};
use rustc_span::source_map::SourceMap;
use rustc_span::{FileLines, FileName, SourceFile, Span, char_width, str_width};
use termcolor::{Buffer, BufferWriter, Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
use tracing::{debug, instrument, trace, warn};
use crate::diagnostic::DiagLocation;
use crate::registry::Registry;
use crate::snippet::{
Annotation, AnnotationColumn, AnnotationType, Line, MultilineAnnotation, Style, StyledString,
};
use crate::styled_buffer::StyledBuffer;
use crate::translation::{Translate, to_fluent_args};
use crate::{
CodeSuggestion, DiagCtxt, DiagInner, DiagMessage, ErrCode, FluentBundle, LazyFallbackBundle,
Level, MultiSpan, Subdiag, SubstitutionHighlight, SuggestionStyle, TerminalUrl,
};
/// Default column width, used in tests and when terminal dimensions cannot be determined.
const DEFAULT_COLUMN_WIDTH: usize = 140;
/// Describes the way the content of the `rendered` field of the json output is generated
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum HumanReadableErrorType {
Default,
Unicode,
AnnotateSnippet,
Short,
}
impl HumanReadableErrorType {
pub fn short(&self) -> bool {
*self == HumanReadableErrorType::Short
}
}
#[derive(Clone, Copy, Debug)]
struct Margin {
/// The available whitespace in the left that can be consumed when centering.
pub whitespace_left: usize,
/// The column of the beginning of leftmost span.
pub span_left: usize,
/// The column of the end of rightmost span.
pub span_right: usize,
/// The beginning of the line to be displayed.
pub computed_left: usize,
/// The end of the line to be displayed.
pub computed_right: usize,
/// The current width of the terminal. Uses value of `DEFAULT_COLUMN_WIDTH` constant by default
/// and in tests.
pub column_width: usize,
/// The end column of a span label, including the span. Doesn't account for labels not in the
/// same line as the span.
pub label_right: usize,
}
impl Margin {
fn new(
whitespace_left: usize,
span_left: usize,
span_right: usize,
label_right: usize,
column_width: usize,
max_line_len: usize,
) -> Self {
// The 6 is padding to give a bit of room for `...` when displaying:
// ```
// error: message
// --> file.rs:16:58
// |
// 16 | ... fn foo(self) -> Self::Bar {
// | ^^^^^^^^^
// ```
let mut m = Margin {
whitespace_left: whitespace_left.saturating_sub(6),
span_left: span_left.saturating_sub(6),
span_right: span_right + 6,
computed_left: 0,
computed_right: 0,
column_width,
label_right: label_right + 6,
};
m.compute(max_line_len);
m
}
fn was_cut_left(&self) -> bool {
self.computed_left > 0
}
fn was_cut_right(&self, line_len: usize) -> bool {
let right =
if self.computed_right == self.span_right || self.computed_right == self.label_right {
// FIXME: This comment refers to the only callsite of this method.
// Rephrase it or refactor it, so it can stand on its own.
// Account for the "..." padding given above. Otherwise we end up with code lines
// that do fit but end in "..." as if they were trimmed.
// FIXME: Don't hard-code this offset. Is this meant to represent
// `2 * str_width(self.margin())`?
self.computed_right - 6
} else {
self.computed_right
};
right < line_len && self.computed_left + self.column_width < line_len
}
fn compute(&mut self, max_line_len: usize) {
// When there's a lot of whitespace (>20), we want to trim it as it is useless.
self.computed_left = if self.whitespace_left > 20 {
self.whitespace_left - 16 // We want some padding.
} else {
0
};
// We want to show as much as possible, max_line_len is the rightmost boundary for the
// relevant code.
self.computed_right = max(max_line_len, self.computed_left);
if self.computed_right - self.computed_left > self.column_width {
// Trimming only whitespace isn't enough, let's get craftier.
if self.label_right - self.whitespace_left <= self.column_width {
// Attempt to fit the code window only trimming whitespace.
self.computed_left = self.whitespace_left;
self.computed_right = self.computed_left + self.column_width;
} else if self.label_right - self.span_left <= self.column_width {
// Attempt to fit the code window considering only the spans and labels.
let padding_left = (self.column_width - (self.label_right - self.span_left)) / 2;
self.computed_left = self.span_left.saturating_sub(padding_left);
self.computed_right = self.computed_left + self.column_width;
} else if self.span_right - self.span_left <= self.column_width {
// Attempt to fit the code window considering the spans and labels plus padding.
let padding_left = (self.column_width - (self.span_right - self.span_left)) / 5 * 2;
self.computed_left = self.span_left.saturating_sub(padding_left);
self.computed_right = self.computed_left + self.column_width;
} else {
// Mostly give up but still don't show the full line.
self.computed_left = self.span_left;
self.computed_right = self.span_right;
}
}
}
fn left(&self, line_len: usize) -> usize {
min(self.computed_left, line_len)
}
fn right(&self, line_len: usize) -> usize {
if line_len.saturating_sub(self.computed_left) <= self.column_width {
line_len
} else {
min(line_len, self.computed_right)
}
}
}
const ANONYMIZED_LINE_NUM: &str = "LL";
pub type DynEmitter = dyn Emitter + DynSend;
/// Emitter trait for emitting errors.
pub trait Emitter: Translate {
/// Emit a structured diagnostic.
fn emit_diagnostic(&mut self, diag: DiagInner, registry: &Registry);
/// Emit a notification that an artifact has been output.
/// Currently only supported for the JSON format.
fn emit_artifact_notification(&mut self, _path: &Path, _artifact_type: &str) {}
/// Emit a report about future breakage.
/// Currently only supported for the JSON format.
fn emit_future_breakage_report(&mut self, _diags: Vec<DiagInner>, _registry: &Registry) {}
/// Emit list of unused externs.
/// Currently only supported for the JSON format.
fn emit_unused_externs(
&mut self,
_lint_level: rustc_lint_defs::Level,
_unused_externs: &[&str],
) {
}
/// Checks if should show explanations about "rustc --explain"
fn should_show_explain(&self) -> bool {
true
}
/// Checks if we can use colors in the current output stream.
fn supports_color(&self) -> bool {
false
}
fn source_map(&self) -> Option<&SourceMap>;
/// Formats the substitutions of the primary_span
///
/// There are a lot of conditions to this method, but in short:
///
/// * If the current `DiagInner` has only one visible `CodeSuggestion`,
/// we format the `help` suggestion depending on the content of the
/// substitutions. In that case, we modify the span and clear the
/// suggestions.
///
/// * If the current `DiagInner` has multiple suggestions,
/// we leave `primary_span` and the suggestions untouched.
fn primary_span_formatted(
&mut self,
primary_span: &mut MultiSpan,
suggestions: &mut Vec<CodeSuggestion>,
fluent_args: &FluentArgs<'_>,
) {
if let Some((sugg, rest)) = suggestions.split_first() {
let msg = self.translate_message(&sugg.msg, fluent_args).map_err(Report::new).unwrap();
if rest.is_empty()
// ^ if there is only one suggestion
// don't display multi-suggestions as labels
&& let [substitution] = sugg.substitutions.as_slice()
// don't display multipart suggestions as labels
&& let [part] = substitution.parts.as_slice()
// don't display long messages as labels
&& msg.split_whitespace().count() < 10
// don't display multiline suggestions as labels
&& !part.snippet.contains('\n')
&& ![
// when this style is set we want the suggestion to be a message, not inline
SuggestionStyle::HideCodeAlways,
// trivial suggestion for tooling's sake, never shown
SuggestionStyle::CompletelyHidden,
// subtle suggestion, never shown inline
SuggestionStyle::ShowAlways,
].contains(&sugg.style)
{
let snippet = part.snippet.trim();
let msg = if snippet.is_empty() || sugg.style.hide_inline() {
// This substitution is only removal OR we explicitly don't want to show the
// code inline (`hide_inline`). Therefore, we don't show the substitution.
format!("help: {msg}")
} else {
// Show the default suggestion text with the substitution
format!(
"help: {}{}: `{}`",
msg,
if self
.source_map()
.is_some_and(|sm| is_case_difference(sm, snippet, part.span,))
{
" (notice the capitalization)"
} else {
""
},
snippet,
)
};
primary_span.push_span_label(part.span, msg);
// We return only the modified primary_span
suggestions.clear();
} else {
// if there are multiple suggestions, print them all in full
// to be consistent. We could try to figure out if we can
// make one (or the first one) inline, but that would give
// undue importance to a semi-random suggestion
}
} else {
// do nothing
}
}
fn fix_multispans_in_extern_macros_and_render_macro_backtrace(
&self,
span: &mut MultiSpan,
children: &mut Vec<Subdiag>,
level: &Level,
backtrace: bool,
) {
// Check for spans in macros, before `fix_multispans_in_extern_macros`
// has a chance to replace them.
let has_macro_spans: Vec<_> = iter::once(&*span)
.chain(children.iter().map(|child| &child.span))
.flat_map(|span| span.primary_spans())
.flat_map(|sp| sp.macro_backtrace())
.filter_map(|expn_data| {
match expn_data.kind {
ExpnKind::Root => None,
// Skip past non-macro entries, just in case there
// are some which do actually involve macros.
ExpnKind::Desugaring(..) | ExpnKind::AstPass(..) => None,
ExpnKind::Macro(macro_kind, name) => Some((macro_kind, name)),
}
})
.collect();
if !backtrace {
self.fix_multispans_in_extern_macros(span, children);
}
self.render_multispans_macro_backtrace(span, children, backtrace);
if !backtrace {
if let Some((macro_kind, name)) = has_macro_spans.first() {
// Mark the actual macro this originates from
let and_then = if let Some((macro_kind, last_name)) = has_macro_spans.last()
&& last_name != name
{
let descr = macro_kind.descr();
format!(" which comes from the expansion of the {descr} `{last_name}`",)
} else {
"".to_string()
};
let descr = macro_kind.descr();
let msg = format!(
"this {level} originates in the {descr} `{name}`{and_then} \
(in Nightly builds, run with -Z macro-backtrace for more info)",
);
children.push(Subdiag {
level: Level::Note,
messages: vec![(DiagMessage::from(msg), Style::NoStyle)],
span: MultiSpan::new(),
});
}
}
}
fn render_multispans_macro_backtrace(
&self,
span: &mut MultiSpan,
children: &mut Vec<Subdiag>,
backtrace: bool,
) {
for span in iter::once(span).chain(children.iter_mut().map(|child| &mut child.span)) {
self.render_multispan_macro_backtrace(span, backtrace);
}
}
fn render_multispan_macro_backtrace(&self, span: &mut MultiSpan, always_backtrace: bool) {
let mut new_labels = FxIndexSet::default();
for &sp in span.primary_spans() {
if sp.is_dummy() {
continue;
}
// FIXME(eddyb) use `retain` on `macro_backtrace` to remove all the
// entries we don't want to print, to make sure the indices being
// printed are contiguous (or omitted if there's only one entry).
let macro_backtrace: Vec<_> = sp.macro_backtrace().collect();
for (i, trace) in macro_backtrace.iter().rev().enumerate() {
if trace.def_site.is_dummy() {
continue;
}
if always_backtrace {
new_labels.insert((
trace.def_site,
format!(
"in this expansion of `{}`{}",
trace.kind.descr(),
if macro_backtrace.len() > 1 {
// if macro_backtrace.len() == 1 it'll be
// pointed at by "in this macro invocation"
format!(" (#{})", i + 1)
} else {
String::new()
},
),
));
}
// Don't add a label on the call site if the diagnostic itself
// already points to (a part of) that call site, as the label
// is meant for showing the relevant invocation when the actual
// diagnostic is pointing to some part of macro definition.
//
// This also handles the case where an external span got replaced
// with the call site span by `fix_multispans_in_extern_macros`.
//
// NB: `-Zmacro-backtrace` overrides this, for uniformity, as the
// "in this expansion of" label above is always added in that mode,
// and it needs an "in this macro invocation" label to match that.
let redundant_span = trace.call_site.contains(sp);
if !redundant_span || always_backtrace {
let msg: Cow<'static, _> = match trace.kind {
ExpnKind::Macro(MacroKind::Attr, _) => {
"this procedural macro expansion".into()
}
ExpnKind::Macro(MacroKind::Derive, _) => {
"this derive macro expansion".into()
}
ExpnKind::Macro(MacroKind::Bang, _) => "this macro invocation".into(),
ExpnKind::Root => "the crate root".into(),
ExpnKind::AstPass(kind) => kind.descr().into(),
ExpnKind::Desugaring(kind) => {
format!("this {} desugaring", kind.descr()).into()
}
};
new_labels.insert((
trace.call_site,
format!(
"in {}{}",
msg,
if macro_backtrace.len() > 1 && always_backtrace {
// only specify order when the macro
// backtrace is multiple levels deep
format!(" (#{})", i + 1)
} else {
String::new()
},
),
));
}
if !always_backtrace {
break;
}
}
}
for (label_span, label_text) in new_labels {
span.push_span_label(label_span, label_text);
}
}
// This does a small "fix" for multispans by looking to see if it can find any that
// point directly at external macros. Since these are often difficult to read,
// this will change the span to point at the use site.
fn fix_multispans_in_extern_macros(&self, span: &mut MultiSpan, children: &mut Vec<Subdiag>) {
debug!("fix_multispans_in_extern_macros: before: span={:?} children={:?}", span, children);
self.fix_multispan_in_extern_macros(span);
for child in children.iter_mut() {
self.fix_multispan_in_extern_macros(&mut child.span);
}
debug!("fix_multispans_in_extern_macros: after: span={:?} children={:?}", span, children);
}
// This "fixes" MultiSpans that contain `Span`s pointing to locations inside of external macros.
// Since these locations are often difficult to read,
// we move these spans from the external macros to their corresponding use site.
fn fix_multispan_in_extern_macros(&self, span: &mut MultiSpan) {
let Some(source_map) = self.source_map() else { return };
// First, find all the spans in external macros and point instead at their use site.
let replacements: Vec<(Span, Span)> = span
.primary_spans()
.iter()
.copied()
.chain(span.span_labels().iter().map(|sp_label| sp_label.span))
.filter_map(|sp| {
if !sp.is_dummy() && source_map.is_imported(sp) {
let maybe_callsite = sp.source_callsite();
if sp != maybe_callsite {
return Some((sp, maybe_callsite));
}
}
None
})
.collect();
// After we have them, make sure we replace these 'bad' def sites with their use sites.
for (from, to) in replacements {
span.replace(from, to);
}
}
}
impl Translate for HumanEmitter {
fn fluent_bundle(&self) -> Option<&FluentBundle> {
self.fluent_bundle.as_deref()
}
fn fallback_fluent_bundle(&self) -> &FluentBundle {
&self.fallback_bundle
}
}
impl Emitter for HumanEmitter {
fn source_map(&self) -> Option<&SourceMap> {
self.sm.as_deref()
}
fn emit_diagnostic(&mut self, mut diag: DiagInner, _registry: &Registry) {
let fluent_args = to_fluent_args(diag.args.iter());
let mut suggestions = diag.suggestions.unwrap_tag();
self.primary_span_formatted(&mut diag.span, &mut suggestions, &fluent_args);
self.fix_multispans_in_extern_macros_and_render_macro_backtrace(
&mut diag.span,
&mut diag.children,
&diag.level,
self.macro_backtrace,
);
self.emit_messages_default(
&diag.level,
&diag.messages,
&fluent_args,
&diag.code,
&diag.span,
&diag.children,
&suggestions,
self.track_diagnostics.then_some(&diag.emitted_at),
);
}
fn should_show_explain(&self) -> bool {
!self.short_message
}
fn supports_color(&self) -> bool {
self.dst.supports_color()
}
}
/// An emitter that does nothing when emitting a non-fatal diagnostic.
/// Fatal diagnostics are forwarded to `fatal_dcx` to avoid silent
/// failures of rustc, as witnessed e.g. in issue #89358.
pub struct SilentEmitter {
pub fallback_bundle: LazyFallbackBundle,
pub fatal_dcx: DiagCtxt,
pub fatal_note: Option<String>,
pub emit_fatal_diagnostic: bool,
}
impl Translate for SilentEmitter {
fn fluent_bundle(&self) -> Option<&FluentBundle> {
None
}
fn fallback_fluent_bundle(&self) -> &FluentBundle {
// Ideally this field wouldn't be necessary and the fallback bundle in `fatal_dcx` would be
// used but the lock prevents this.
&self.fallback_bundle
}
}
impl Emitter for SilentEmitter {
fn source_map(&self) -> Option<&SourceMap> {
None
}
fn emit_diagnostic(&mut self, mut diag: DiagInner, _registry: &Registry) {
if self.emit_fatal_diagnostic && diag.level == Level::Fatal {
if let Some(fatal_note) = &self.fatal_note {
diag.sub(Level::Note, fatal_note.clone(), MultiSpan::new());
}
self.fatal_dcx.handle().emit_diagnostic(diag);
}
}
}
/// Maximum number of suggestions to be shown
///
/// Arbitrary, but taken from trait import suggestion limit
pub const MAX_SUGGESTIONS: usize = 4;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum ColorConfig {
Auto,
Always,
Never,
}
impl ColorConfig {
pub fn to_color_choice(self) -> ColorChoice {
match self {
ColorConfig::Always => {
if io::stderr().is_terminal() {
ColorChoice::Always
} else {
ColorChoice::AlwaysAnsi
}
}
ColorConfig::Never => ColorChoice::Never,
ColorConfig::Auto if io::stderr().is_terminal() => ColorChoice::Auto,
ColorConfig::Auto => ColorChoice::Never,
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum OutputTheme {
Ascii,
Unicode,
}
/// Handles the writing of `HumanReadableErrorType::Default` and `HumanReadableErrorType::Short`
#[derive(Setters)]
pub struct HumanEmitter {
#[setters(skip)]
dst: IntoDynSyncSend<Destination>,
sm: Option<Lrc<SourceMap>>,
fluent_bundle: Option<Lrc<FluentBundle>>,
#[setters(skip)]
fallback_bundle: LazyFallbackBundle,
short_message: bool,
teach: bool,
ui_testing: bool,
ignored_directories_in_source_blocks: Vec<String>,
diagnostic_width: Option<usize>,
macro_backtrace: bool,
track_diagnostics: bool,
terminal_url: TerminalUrl,
theme: OutputTheme,
}
#[derive(Debug)]
pub(crate) struct FileWithAnnotatedLines {
pub(crate) file: Lrc<SourceFile>,
pub(crate) lines: Vec<Line>,
multiline_depth: usize,
}
impl HumanEmitter {
pub fn new(dst: Destination, fallback_bundle: LazyFallbackBundle) -> HumanEmitter {
HumanEmitter {
dst: IntoDynSyncSend(dst),
sm: None,
fluent_bundle: None,
fallback_bundle,
short_message: false,
teach: false,
ui_testing: false,
ignored_directories_in_source_blocks: Vec::new(),
diagnostic_width: None,
macro_backtrace: false,
track_diagnostics: false,
terminal_url: TerminalUrl::No,
theme: OutputTheme::Ascii,
}
}
fn maybe_anonymized(&self, line_num: usize) -> Cow<'static, str> {
if self.ui_testing {
Cow::Borrowed(ANONYMIZED_LINE_NUM)
} else {
Cow::Owned(line_num.to_string())
}
}
fn draw_line(
&self,
buffer: &mut StyledBuffer,
source_string: &str,
line_index: usize,
line_offset: usize,
width_offset: usize,
code_offset: usize,
margin: Margin,
) {
// Tabs are assumed to have been replaced by spaces in calling code.
debug_assert!(!source_string.contains('\t'));
let line_len = source_string.len();
// Create the source line we will highlight.
let left = margin.left(line_len);
let right = margin.right(line_len);
// FIXME: The following code looks fishy. See #132860.
// On long lines, we strip the source line, accounting for unicode.
let mut taken = 0;
let code: String = source_string
.chars()
.skip(left)
.take_while(|ch| {
// Make sure that the trimming on the right will fall within the terminal width.
let next = char_width(*ch);
if taken + next > right - left {
return false;
}
taken += next;
true
})
.collect();
buffer.puts(line_offset, code_offset, &code, Style::Quotation);
let placeholder = self.margin();
if margin.was_cut_left() {
// We have stripped some code/whitespace from the beginning, make it clear.
buffer.puts(line_offset, code_offset, placeholder, Style::LineNumber);
}
if margin.was_cut_right(line_len) {
let padding = str_width(placeholder);
// We have stripped some code after the rightmost span end, make it clear we did so.
buffer.puts(line_offset, code_offset + taken - padding, placeholder, Style::LineNumber);
}
buffer.puts(line_offset, 0, &self.maybe_anonymized(line_index), Style::LineNumber);
self.draw_col_separator_no_space(buffer, line_offset, width_offset - 2);
}
#[instrument(level = "trace", skip(self), ret)]
fn render_source_line(
&self,
buffer: &mut StyledBuffer,
file: Lrc<SourceFile>,
line: &Line,
width_offset: usize,
code_offset: usize,
margin: Margin,
close_window: bool,
) -> Vec<(usize, Style)> {
// Draw:
//
// LL | ... code ...
// | ^^-^ span label
// | |
// | secondary span label
//
// ^^ ^ ^^^ ^^^^ ^^^ we don't care about code too far to the right of a span, we trim it
// | | | |
// | | | actual code found in your source code and the spans we use to mark it
// | | when there's too much wasted space to the left, trim it
// | vertical divider between the column number and the code
// column number
if line.line_index == 0 {
return Vec::new();
}
let source_string = match file.get_line(line.line_index - 1) {
Some(s) => normalize_whitespace(&s),
None => return Vec::new(),
};
trace!(?source_string);
let line_offset = buffer.num_lines();
// Left trim
let left = margin.left(source_string.len());
// FIXME: This looks fishy. See #132860.
// Account for unicode characters of width !=0 that were removed.
let left = source_string.chars().take(left).map(|ch| char_width(ch)).sum();
self.draw_line(
buffer,
&source_string,
line.line_index,
line_offset,
width_offset,
code_offset,
margin,
);
// Special case when there's only one annotation involved, it is the start of a multiline
// span and there's no text at the beginning of the code line. Instead of doing the whole
// graph:
//
// 2 | fn foo() {
// | _^
// 3 | |
// 4 | | }
// | |_^ test
//
// we simplify the output to:
//
// 2 | / fn foo() {
// 3 | |
// 4 | | }
// | |_^ test
let mut buffer_ops = vec![];
let mut annotations = vec![];
let mut short_start = true;
for ann in &line.annotations {
if let AnnotationType::MultilineStart(depth) = ann.annotation_type {
if source_string.chars().take(ann.start_col.display).all(|c| c.is_whitespace()) {
let uline = self.underline(ann.is_primary);
let chr = uline.multiline_whole_line;
annotations.push((depth, uline.style));
buffer_ops.push((line_offset, width_offset + depth - 1, chr, uline.style));
} else {
short_start = false;
break;
}
} else if let AnnotationType::MultilineLine(_) = ann.annotation_type {
} else {
short_start = false;
break;
}
}
if short_start {
for (y, x, c, s) in buffer_ops {
buffer.putc(y, x, c, s);
}
return annotations;
}
// We want to display like this:
//
// vec.push(vec.pop().unwrap());
// --- ^^^ - previous borrow ends here
// | |
// | error occurs here
// previous borrow of `vec` occurs here
//
// But there are some weird edge cases to be aware of:
//
// vec.push(vec.pop().unwrap());
// -------- - previous borrow ends here
// ||
// |this makes no sense
// previous borrow of `vec` occurs here
//
// For this reason, we group the lines into "highlight lines"
// and "annotations lines", where the highlight lines have the `^`.
// Sort the annotations by (start, end col)
// The labels are reversed, sort and then reversed again.
// Consider a list of annotations (A1, A2, C1, C2, B1, B2) where
// the letter signifies the span. Here we are only sorting by the
// span and hence, the order of the elements with the same span will
// not change. On reversing the ordering (|a, b| but b.cmp(a)), you get
// (C1, C2, B1, B2, A1, A2). All the elements with the same span are
// still ordered first to last, but all the elements with different
// spans are ordered by their spans in last to first order. Last to
// first order is important, because the jiggly lines and | are on
// the left, so the rightmost span needs to be rendered first,
// otherwise the lines would end up needing to go over a message.
let mut annotations = line.annotations.clone();
annotations.sort_by_key(|a| Reverse(a.start_col));
// First, figure out where each label will be positioned.
//
// In the case where you have the following annotations:
//
// vec.push(vec.pop().unwrap());
// -------- - previous borrow ends here [C]
// ||
// |this makes no sense [B]
// previous borrow of `vec` occurs here [A]
//
// `annotations_position` will hold [(2, A), (1, B), (0, C)].
//
// We try, when possible, to stick the rightmost annotation at the end
// of the highlight line:
//
// vec.push(vec.pop().unwrap());
// --- --- - previous borrow ends here
//
// But sometimes that's not possible because one of the other
// annotations overlaps it. For example, from the test
// `span_overlap_label`, we have the following annotations
// (written on distinct lines for clarity):
//
// fn foo(x: u32) {
// --------------
// -
//
// In this case, we can't stick the rightmost-most label on
// the highlight line, or we would get:
//
// fn foo(x: u32) {
// -------- x_span
// |
// fn_span
//
// which is totally weird. Instead we want:
//
// fn foo(x: u32) {
// --------------
// | |
// | x_span
// fn_span
//
// which is...less weird, at least. In fact, in general, if
// the rightmost span overlaps with any other span, we should
// use the "hang below" version, so we can at least make it
// clear where the span *starts*. There's an exception for this
// logic, when the labels do not have a message:
//
// fn foo(x: u32) {
// --------------
// |
// x_span
//
// instead of:
//
// fn foo(x: u32) {
// --------------
// | |
// | x_span
// <EMPTY LINE>
//
let mut annotations_position = vec![];
let mut line_len: usize = 0;
let mut p = 0;
for (i, annotation) in annotations.iter().enumerate() {
for (j, next) in annotations.iter().enumerate() {
if overlaps(next, annotation, 0) // This label overlaps with another one and both
&& annotation.has_label() // take space (they have text and are not
&& j > i // multiline lines).
&& p == 0
// We're currently on the first line, move the label one line down
{
// If we're overlapping with an un-labelled annotation with the same span
// we can just merge them in the output
if next.start_col == annotation.start_col
&& next.end_col == annotation.end_col
&& !next.has_label()
{
continue;
}
// This annotation needs a new line in the output.
p += 1;
break;
}
}
annotations_position.push((p, annotation));
for (j, next) in annotations.iter().enumerate() {
if j > i {
let l = next.label.as_ref().map_or(0, |label| label.len() + 2);
if (overlaps(next, annotation, l) // Do not allow two labels to be in the same
// line if they overlap including padding, to
// avoid situations like:
//
// fn foo(x: u32) {
// -------^------
// | |
// fn_spanx_span
//
&& annotation.has_label() // Both labels must have some text, otherwise
&& next.has_label()) // they are not overlapping.
// Do not add a new line if this annotation
// or the next are vertical line placeholders.
|| (annotation.takes_space() // If either this or the next annotation is
&& next.has_label()) // multiline start/end, move it to a new line
|| (annotation.has_label() // so as not to overlap the horizontal lines.
&& next.takes_space())
|| (annotation.takes_space() && next.takes_space())
|| (overlaps(next, annotation, l)
&& next.end_col <= annotation.end_col
&& next.has_label()
&& p == 0)
// Avoid #42595.
{
// This annotation needs a new line in the output.
p += 1;
break;
}
}
}
line_len = max(line_len, p);
}
if line_len != 0 {
line_len += 1;
}
// If there are no annotations or the only annotations on this line are
// MultilineLine, then there's only code being shown, stop processing.
if line.annotations.iter().all(|a| a.is_line()) {
return vec![];
}
if annotations_position
.iter()
.all(|(_, ann)| matches!(ann.annotation_type, AnnotationType::MultilineStart(_)))
&& let Some(max_pos) = annotations_position.iter().map(|(pos, _)| *pos).max()
{
// Special case the following, so that we minimize overlapping multiline spans.
//
// 3 │ X0 Y0 Z0
// │ ┏━━━━━┛ │ │ < We are writing these lines
// │ ┃┌───────┘ │ < by reverting the "depth" of
// │ ┃│┌─────────┘ < their multiline spans.
// 4 │ ┃││ X1 Y1 Z1
// 5 │ ┃││ X2 Y2 Z2
// │ ┃│└────╿──│──┘ `Z` label
// │ ┃└─────│──┤
// │ ┗━━━━━━┥ `Y` is a good letter too
// ╰╴ `X` is a good letter
for (pos, _) in &mut annotations_position {
*pos = max_pos - *pos;
}
// We know then that we don't need an additional line for the span label, saving us
// one line of vertical space.
line_len = line_len.saturating_sub(1);
}
// Write the column separator.
//
// After this we will have:
//
// 2 | fn foo() {
// |
// |
// |
// 3 |
// 4 | }
// |
for pos in 0..=line_len {
self.draw_col_separator_no_space(buffer, line_offset + pos + 1, width_offset - 2);
}
if close_window {
self.draw_col_separator_end(buffer, line_offset + line_len + 1, width_offset - 2);
}
// Write the horizontal lines for multiline annotations
// (only the first and last lines need this).
//
// After this we will have:
//
// 2 | fn foo() {
// | __________
// |
// |
// 3 |
// 4 | }
// | _
for &(pos, annotation) in &annotations_position {
let underline = self.underline(annotation.is_primary);
let pos = pos + 1;
match annotation.annotation_type {
AnnotationType::MultilineStart(depth) | AnnotationType::MultilineEnd(depth) => {
self.draw_range(
buffer,
underline.multiline_horizontal,
line_offset + pos,
width_offset + depth,
(code_offset + annotation.start_col.display).saturating_sub(left),
underline.style,
);
}
_ if self.teach => {
buffer.set_style_range(
line_offset,
(code_offset + annotation.start_col.display).saturating_sub(left),
(code_offset + annotation.end_col.display).saturating_sub(left),
underline.style,
annotation.is_primary,
);
}
_ => {}
}
}
// Write the vertical lines for labels that are on a different line as the underline.
//
// After this we will have:
//
// 2 | fn foo() {
// | __________
// | | |
// | |
// 3 | |
// 4 | | }
// | |_
for &(pos, annotation) in &annotations_position {
let underline = self.underline(annotation.is_primary);
let pos = pos + 1;
if pos > 1 && (annotation.has_label() || annotation.takes_space()) {
for p in line_offset + 1..=line_offset + pos {
buffer.putc(
p,
(code_offset + annotation.start_col.display).saturating_sub(left),
match annotation.annotation_type {
AnnotationType::MultilineLine(_) => underline.multiline_vertical,
_ => underline.vertical_text_line,
},
underline.style,
);
}
if let AnnotationType::MultilineStart(_) = annotation.annotation_type {
buffer.putc(
line_offset + pos,
(code_offset + annotation.start_col.display).saturating_sub(left),
underline.bottom_right,
underline.style,
);
}
if let AnnotationType::MultilineEnd(_) = annotation.annotation_type
&& annotation.has_label()
{
buffer.putc(
line_offset + pos,
(code_offset + annotation.start_col.display).saturating_sub(left),
underline.multiline_bottom_right_with_text,
underline.style,
);
}
}
match annotation.annotation_type {
AnnotationType::MultilineStart(depth) => {
buffer.putc(
line_offset + pos,
width_offset + depth - 1,
underline.top_left,
underline.style,
);
for p in line_offset + pos + 1..line_offset + line_len + 2 {
buffer.putc(
p,
width_offset + depth - 1,
underline.multiline_vertical,
underline.style,
);
}
}
AnnotationType::MultilineEnd(depth) => {
for p in line_offset..line_offset + pos {
buffer.putc(
p,
width_offset + depth - 1,
underline.multiline_vertical,
underline.style,
);
}
buffer.putc(
line_offset + pos,
width_offset + depth - 1,
underline.bottom_left,
underline.style,
);
}
_ => (),
}
}
// Write the labels on the annotations that actually have a label.
//
// After this we will have:
//
// 2 | fn foo() {
// | __________
// | |
// | something about `foo`
// 3 |
// 4 | }
// | _ test
for &(pos, annotation) in &annotations_position {
let style =
if annotation.is_primary { Style::LabelPrimary } else { Style::LabelSecondary };
let (pos, col) = if pos == 0 {
if annotation.end_col.display == 0 {
(pos + 1, (annotation.end_col.display + 2).saturating_sub(left))
} else {
(pos + 1, (annotation.end_col.display + 1).saturating_sub(left))
}
} else {
(pos + 2, annotation.start_col.display.saturating_sub(left))
};
if let Some(ref label) = annotation.label {
buffer.puts(line_offset + pos, code_offset + col, label, style);
}
}
// Sort from biggest span to smallest span so that smaller spans are
// represented in the output:
//
// x | fn foo()
// | ^^^---^^
// | | |
// | | something about `foo`
// | something about `fn foo()`
annotations_position.sort_by_key(|(_, ann)| {
// Decreasing order. When annotations share the same length, prefer `Primary`.
(Reverse(ann.len()), ann.is_primary)
});
// Write the underlines.
//
// After this we will have:
//
// 2 | fn foo() {
// | ____-_____^
// | |
// | something about `foo`
// 3 |
// 4 | }
// | _^ test
for &(pos, annotation) in &annotations_position {
let uline = self.underline(annotation.is_primary);
for p in annotation.start_col.display..annotation.end_col.display {
// The default span label underline.
buffer.putc(
line_offset + 1,
(code_offset + p).saturating_sub(left),
uline.underline,
uline.style,
);
}
if pos == 0
&& matches!(
annotation.annotation_type,
AnnotationType::MultilineStart(_) | AnnotationType::MultilineEnd(_)
)
{
// The beginning of a multiline span with its leftward moving line on the same line.
buffer.putc(
line_offset + 1,
(code_offset + annotation.start_col.display).saturating_sub(left),
match annotation.annotation_type {
AnnotationType::MultilineStart(_) => uline.top_right_flat,
AnnotationType::MultilineEnd(_) => uline.multiline_end_same_line,
_ => panic!("unexpected annotation type: {annotation:?}"),
},
uline.style,
);
} else if pos != 0
&& matches!(
annotation.annotation_type,
AnnotationType::MultilineStart(_) | AnnotationType::MultilineEnd(_)
)
{
// The beginning of a multiline span with its leftward moving line on another line,
// so we start going down first.
buffer.putc(
line_offset + 1,
(code_offset + annotation.start_col.display).saturating_sub(left),
match annotation.annotation_type {
AnnotationType::MultilineStart(_) => uline.multiline_start_down,
AnnotationType::MultilineEnd(_) => uline.multiline_end_up,
_ => panic!("unexpected annotation type: {annotation:?}"),
},
uline.style,
);
} else if pos != 0 && annotation.has_label() {
// The beginning of a span label with an actual label, we'll point down.
buffer.putc(
line_offset + 1,
(code_offset + annotation.start_col.display).saturating_sub(left),
uline.label_start,
uline.style,
);
}
}
annotations_position
.iter()
.filter_map(|&(_, annotation)| match annotation.annotation_type {
AnnotationType::MultilineStart(p) | AnnotationType::MultilineEnd(p) => {
let style = if annotation.is_primary {
Style::LabelPrimary
} else {
Style::LabelSecondary
};
Some((p, style))
}
_ => None,
})
.collect::<Vec<_>>()
}
fn get_multispan_max_line_num(&mut self, msp: &MultiSpan) -> usize {
let Some(ref sm) = self.sm else {
return 0;
};
let will_be_emitted = |span: Span| {
!span.is_dummy() && {
let file = sm.lookup_source_file(span.hi());
should_show_source_code(&self.ignored_directories_in_source_blocks, sm, &file)
}
};
let mut max = 0;
for primary_span in msp.primary_spans() {
if will_be_emitted(*primary_span) {
let hi = sm.lookup_char_pos(primary_span.hi());
max = (hi.line).max(max);
}
}
if !self.short_message {
for span_label in msp.span_labels() {
if will_be_emitted(span_label.span) {
let hi = sm.lookup_char_pos(span_label.span.hi());
max = (hi.line).max(max);
}
}
}
max
}
fn get_max_line_num(&mut self, span: &MultiSpan, children: &[Subdiag]) -> usize {
let primary = self.get_multispan_max_line_num(span);
children
.iter()
.map(|sub| self.get_multispan_max_line_num(&sub.span))
.max()
.unwrap_or(0)
.max(primary)
}
/// Adds a left margin to every line but the first, given a padding length and the label being
/// displayed, keeping the provided highlighting.
fn msgs_to_buffer(
&self,
buffer: &mut StyledBuffer,
msgs: &[(DiagMessage, Style)],
args: &FluentArgs<'_>,
padding: usize,
label: &str,
override_style: Option<Style>,
) -> usize {
// The extra 5 ` ` is padding that's always needed to align to the `note: `:
//
// error: message
// --> file.rs:13:20
// |
// 13 | <CODE>
// | ^^^^
// |
// = note: multiline
// message
// ++^^^----xx
// | | | |
// | | | magic `2`
// | | length of label
// | magic `3`
// `max_line_num_len`
let padding = " ".repeat(padding + label.len() + 5);
/// Returns `override` if it is present and `style` is `NoStyle` or `style` otherwise
fn style_or_override(style: Style, override_: Option<Style>) -> Style {
match (style, override_) {
(Style::NoStyle, Some(override_)) => override_,
_ => style,
}
}
let mut line_number = 0;
// Provided the following diagnostic message:
//
// let msgs = vec![
// ("
// ("highlighted multiline\nstring to\nsee how it ", Style::NoStyle),
// ("looks", Style::Highlight),
// ("with\nvery ", Style::NoStyle),
// ("weird", Style::Highlight),
// (" formats\n", Style::NoStyle),
// ("see?", Style::Highlight),
// ];
//
// the expected output on a note is (* surround the highlighted text)
//
// = note: highlighted multiline
// string to
// see how it *looks* with
// very *weird* formats
// see?
for (text, style) in msgs.iter() {
let text = self.translate_message(text, args).map_err(Report::new).unwrap();
let text = &normalize_whitespace(&text);
let lines = text.split('\n').collect::<Vec<_>>();
if lines.len() > 1 {
for (i, line) in lines.iter().enumerate() {
if i != 0 {
line_number += 1;
buffer.append(line_number, &padding, Style::NoStyle);
}
buffer.append(line_number, line, style_or_override(*style, override_style));
}
} else {
buffer.append(line_number, text, style_or_override(*style, override_style));
}
}
line_number
}
#[instrument(level = "trace", skip(self, args), ret)]
fn emit_messages_default_inner(
&mut self,
msp: &MultiSpan,
msgs: &[(DiagMessage, Style)],
args: &FluentArgs<'_>,
code: &Option<ErrCode>,
level: &Level,
max_line_num_len: usize,
is_secondary: bool,
emitted_at: Option<&DiagLocation>,
is_cont: bool,
) -> io::Result<()> {
let mut buffer = StyledBuffer::new();
if !msp.has_primary_spans() && !msp.has_span_labels() && is_secondary && !self.short_message
{
// This is a secondary message with no span info
for _ in 0..max_line_num_len {
buffer.prepend(0, " ", Style::NoStyle);
}
self.draw_note_separator(&mut buffer, 0, max_line_num_len + 1, is_cont);
if *level != Level::FailureNote {
buffer.append(0, level.to_str(), Style::MainHeaderMsg);
buffer.append(0, ": ", Style::NoStyle);
}
let printed_lines =
self.msgs_to_buffer(&mut buffer, msgs, args, max_line_num_len, "note", None);
if is_cont && matches!(self.theme, OutputTheme::Unicode) {
// There's another note after this one, associated to the subwindow above.
// We write additional vertical lines to join them:
// ╭▸ test.rs:3:3
// │
// 3 │ code
// │ ━━━━
// │
// ├ note: foo
// │ bar
// ╰ note: foo
// bar
for i in 1..=printed_lines {
self.draw_col_separator_no_space(&mut buffer, i, max_line_num_len + 1);
}
}
} else {
let mut label_width = 0;
// The failure note level itself does not provide any useful diagnostic information
if *level != Level::FailureNote {
buffer.append(0, level.to_str(), Style::Level(*level));
label_width += level.to_str().len();
}
if let Some(code) = code {
buffer.append(0, "[", Style::Level(*level));
let code = if let TerminalUrl::Yes = self.terminal_url {
let path = "https://doc.rust-lang.org/error_codes";
format!("\x1b]8;;{path}/{code}.html\x07{code}\x1b]8;;\x07")
} else {
code.to_string()
};
buffer.append(0, &code, Style::Level(*level));
buffer.append(0, "]", Style::Level(*level));
label_width += 2 + code.len();
}
let header_style = if is_secondary {
Style::HeaderMsg
} else if self.short_message {
// For short messages avoid bolding the message, as it doesn't look great (#63835).
Style::NoStyle
} else {
Style::MainHeaderMsg
};
if *level != Level::FailureNote {
buffer.append(0, ": ", header_style);
label_width += 2;
}
let mut line = 0;
for (text, style) in msgs.iter() {
let text = self.translate_message(text, args).map_err(Report::new).unwrap();
// Account for newlines to align output to its label.
for text in normalize_whitespace(&text).lines() {
buffer.append(
line,
&format!(
"{}{}",
if line == 0 { String::new() } else { " ".repeat(label_width) },
text
),
match style {
Style::Highlight => *style,
_ => header_style,
},
);
line += 1;
}
// We add lines above, but if the last line has no explicit newline (which would
// yield an empty line), then we revert one line up to continue with the next
// styled text chunk on the same line as the last one from the prior one. Otherwise
// every `text` would appear on their own line (because even though they didn't end
// in '\n', they advanced `line` by one).
if line > 0 {
line -= 1;
}
}
if self.short_message {
let labels = msp
.span_labels()
.into_iter()
.filter_map(|label| match label.label {
Some(msg) if label.is_primary => {
let text = self.translate_message(&msg, args).ok()?;
if !text.trim().is_empty() { Some(text.to_string()) } else { None }
}
_ => None,
})
.collect::<Vec<_>>()
.join(", ");
if !labels.is_empty() {
buffer.append(line, ": ", Style::NoStyle);
buffer.append(line, &labels, Style::NoStyle);
}
}
}
let mut annotated_files = FileWithAnnotatedLines::collect_annotations(self, args, msp);
trace!("{annotated_files:#?}");
// Make sure our primary file comes first
let primary_span = msp.primary_span().unwrap_or_default();
let (Some(sm), false) = (self.sm.as_ref(), primary_span.is_dummy()) else {
// If we don't have span information, emit and exit
return emit_to_destination(&buffer.render(), level, &mut self.dst, self.short_message);
};
let primary_lo = sm.lookup_char_pos(primary_span.lo());
if let Ok(pos) =
annotated_files.binary_search_by(|x| x.file.name.cmp(&primary_lo.file.name))
{
annotated_files.swap(0, pos);
}
// Print out the annotate source lines that correspond with the error
for annotated_file in annotated_files {
// we can't annotate anything if the source is unavailable.
if !should_show_source_code(
&self.ignored_directories_in_source_blocks,
sm,
&annotated_file.file,
) {
if !self.short_message {
// We'll just print an unannotated message.
for (annotation_id, line) in annotated_file.lines.iter().enumerate() {
let mut annotations = line.annotations.clone();
annotations.sort_by_key(|a| Reverse(a.start_col));
let mut line_idx = buffer.num_lines();
let labels: Vec<_> = annotations
.iter()
.filter_map(|a| Some((a.label.as_ref()?, a.is_primary)))
.filter(|(l, _)| !l.is_empty())
.collect();
if annotation_id == 0 || !labels.is_empty() {
buffer.append(
line_idx,
&format!(
"{}:{}:{}",
sm.filename_for_diagnostics(&annotated_file.file.name),
sm.doctest_offset_line(
&annotated_file.file.name,
line.line_index
),
annotations[0].start_col.file + 1,
),
Style::LineAndColumn,
);
if annotation_id == 0 {
buffer.prepend(line_idx, self.file_start(), Style::LineNumber);
} else {
buffer.prepend(
line_idx,
self.secondary_file_start(),
Style::LineNumber,
);
}
for _ in 0..max_line_num_len {
buffer.prepend(line_idx, " ", Style::NoStyle);
}
line_idx += 1;
}
for (label, is_primary) in labels.into_iter() {
let style = if is_primary {
Style::LabelPrimary
} else {
Style::LabelSecondary
};
let pipe = self.col_separator();
buffer.prepend(line_idx, &format!(" {pipe}"), Style::LineNumber);
for _ in 0..max_line_num_len {
buffer.prepend(line_idx, " ", Style::NoStyle);
}
line_idx += 1;
let chr = self.note_separator();
buffer.append(line_idx, &format!(" {chr} note: "), style);
for _ in 0..max_line_num_len {
buffer.prepend(line_idx, " ", Style::NoStyle);
}
buffer.append(line_idx, label, style);
line_idx += 1;
}
}
}
continue;
}
// print out the span location and spacer before we print the annotated source
// to do this, we need to know if this span will be primary
let is_primary = primary_lo.file.name == annotated_file.file.name;
if is_primary {
let loc = primary_lo.clone();
if !self.short_message {
// remember where we are in the output buffer for easy reference
let buffer_msg_line_offset = buffer.num_lines();
buffer.prepend(buffer_msg_line_offset, self.file_start(), Style::LineNumber);
buffer.append(
buffer_msg_line_offset,
&format!(
"{}:{}:{}",
sm.filename_for_diagnostics(&loc.file.name),
sm.doctest_offset_line(&loc.file.name, loc.line),
loc.col.0 + 1,
),
Style::LineAndColumn,
);
for _ in 0..max_line_num_len {
buffer.prepend(buffer_msg_line_offset, " ", Style::NoStyle);
}
} else {
buffer.prepend(
0,
&format!(
"{}:{}:{}: ",
sm.filename_for_diagnostics(&loc.file.name),
sm.doctest_offset_line(&loc.file.name, loc.line),
loc.col.0 + 1,
),
Style::LineAndColumn,
);
}
} else if !self.short_message {
// remember where we are in the output buffer for easy reference
let buffer_msg_line_offset = buffer.num_lines();
// Add spacing line, as shown:
// --> $DIR/file:54:15
// |
// LL | code
// | ^^^^
// | (<- It prints *this* line)
// ::: $DIR/other_file.rs:15:5
// |
// LL | code
// | ----
self.draw_col_separator_no_space(
&mut buffer,
buffer_msg_line_offset,
max_line_num_len + 1,
);
// Then, the secondary file indicator
buffer.prepend(
buffer_msg_line_offset + 1,
self.secondary_file_start(),
Style::LineNumber,
);
let loc = if let Some(first_line) = annotated_file.lines.first() {
let col = if let Some(first_annotation) = first_line.annotations.first() {
format!(":{}", first_annotation.start_col.file + 1)
} else {
String::new()
};
format!(
"{}:{}{}",
sm.filename_for_diagnostics(&annotated_file.file.name),
sm.doctest_offset_line(&annotated_file.file.name, first_line.line_index),
col
)
} else {
format!("{}", sm.filename_for_diagnostics(&annotated_file.file.name))
};
buffer.append(buffer_msg_line_offset + 1, &loc, Style::LineAndColumn);
for _ in 0..max_line_num_len {
buffer.prepend(buffer_msg_line_offset + 1, " ", Style::NoStyle);
}
}
if !self.short_message {
// Put in the spacer between the location and annotated source
let buffer_msg_line_offset = buffer.num_lines();
self.draw_col_separator_no_space(
&mut buffer,
buffer_msg_line_offset,
max_line_num_len + 1,
);
// Contains the vertical lines' positions for active multiline annotations
let mut multilines = FxIndexMap::default();
// Get the left-side margin to remove it
let mut whitespace_margin = usize::MAX;
for line_idx in 0..annotated_file.lines.len() {
let file = Lrc::clone(&annotated_file.file);
let line = &annotated_file.lines[line_idx];
if let Some(source_string) =
line.line_index.checked_sub(1).and_then(|l| file.get_line(l))
{
let leading_whitespace = source_string
.chars()
.take_while(|c| c.is_whitespace())
.map(|c| {
match c {
// Tabs are displayed as 4 spaces
'\t' => 4,
_ => 1,
}
})
.sum();
if source_string.chars().any(|c| !c.is_whitespace()) {
whitespace_margin = min(whitespace_margin, leading_whitespace);
}
}
}
if whitespace_margin == usize::MAX {
whitespace_margin = 0;
}
// Left-most column any visible span points at.
let mut span_left_margin = usize::MAX;
for line in &annotated_file.lines {
for ann in &line.annotations {
span_left_margin = min(span_left_margin, ann.start_col.display);
span_left_margin = min(span_left_margin, ann.end_col.display);
}
}
if span_left_margin == usize::MAX {
span_left_margin = 0;
}
// Right-most column any visible span points at.
let mut span_right_margin = 0;
let mut label_right_margin = 0;
let mut max_line_len = 0;
for line in &annotated_file.lines {
max_line_len = max(
max_line_len,
line.line_index
.checked_sub(1)
.and_then(|l| annotated_file.file.get_line(l))
.map_or(0, |s| s.len()),
);
for ann in &line.annotations {
span_right_margin = max(span_right_margin, ann.start_col.display);
span_right_margin = max(span_right_margin, ann.end_col.display);
// FIXME: account for labels not in the same line
let label_right = ann.label.as_ref().map_or(0, |l| l.len() + 1);
label_right_margin =
max(label_right_margin, ann.end_col.display + label_right);
}
}
let width_offset = 3 + max_line_num_len;
let code_offset = if annotated_file.multiline_depth == 0 {
width_offset
} else {
width_offset + annotated_file.multiline_depth + 1
};
let column_width = if let Some(width) = self.diagnostic_width {
width.saturating_sub(code_offset)
} else if self.ui_testing {
DEFAULT_COLUMN_WIDTH
} else {
termize::dimensions()
.map(|(w, _)| w.saturating_sub(code_offset))
.unwrap_or(DEFAULT_COLUMN_WIDTH)
};
let margin = Margin::new(
whitespace_margin,
span_left_margin,
span_right_margin,
label_right_margin,
column_width,
max_line_len,
);
// Next, output the annotate source for this file
for line_idx in 0..annotated_file.lines.len() {
let previous_buffer_line = buffer.num_lines();
let depths = self.render_source_line(
&mut buffer,
Lrc::clone(&annotated_file.file),
&annotated_file.lines[line_idx],
width_offset,
code_offset,
margin,
!is_cont && line_idx + 1 == annotated_file.lines.len(),
);
let mut to_add = FxHashMap::default();
for (depth, style) in depths {
// FIXME(#120456) - is `swap_remove` correct?
if multilines.swap_remove(&depth).is_none() {
to_add.insert(depth, style);
}
}
// Set the multiline annotation vertical lines to the left of
// the code in this line.
for (depth, style) in &multilines {
for line in previous_buffer_line..buffer.num_lines() {
self.draw_multiline_line(
&mut buffer,
line,
width_offset,
*depth,
*style,
);
}
}
// check to see if we need to print out or elide lines that come between
// this annotated line and the next one.
if line_idx < (annotated_file.lines.len() - 1) {
let line_idx_delta = annotated_file.lines[line_idx + 1].line_index
- annotated_file.lines[line_idx].line_index;
if line_idx_delta > 2 {
let last_buffer_line_num = buffer.num_lines();
self.draw_line_separator(
&mut buffer,
last_buffer_line_num,
width_offset,
);
// Set the multiline annotation vertical lines on `...` bridging line.
for (depth, style) in &multilines {
self.draw_multiline_line(
&mut buffer,
last_buffer_line_num,
width_offset,
*depth,
*style,
);
}
if let Some(line) = annotated_file.lines.get(line_idx) {
for ann in &line.annotations {
if let AnnotationType::MultilineStart(pos) = ann.annotation_type
{
// In the case where we have elided the entire start of the
// multispan because those lines were empty, we still need
// to draw the `|`s across the `...`.
self.draw_multiline_line(
&mut buffer,
last_buffer_line_num,
width_offset,
pos,
if ann.is_primary {
Style::UnderlinePrimary
} else {
Style::UnderlineSecondary
},
);
}
}
}
} else if line_idx_delta == 2 {
let unannotated_line = annotated_file
.file
.get_line(annotated_file.lines[line_idx].line_index)
.unwrap_or_else(|| Cow::from(""));
let last_buffer_line_num = buffer.num_lines();
self.draw_line(
&mut buffer,
&normalize_whitespace(&unannotated_line),
annotated_file.lines[line_idx + 1].line_index - 1,
last_buffer_line_num,
width_offset,
code_offset,
margin,
);
for (depth, style) in &multilines {
self.draw_multiline_line(
&mut buffer,
last_buffer_line_num,
width_offset,
*depth,
*style,
);
}
if let Some(line) = annotated_file.lines.get(line_idx) {
for ann in &line.annotations {
if let AnnotationType::MultilineStart(pos) = ann.annotation_type
{
self.draw_multiline_line(
&mut buffer,
last_buffer_line_num,
width_offset,
pos,
if ann.is_primary {
Style::UnderlinePrimary
} else {
Style::UnderlineSecondary
},
);
}
}
}
}
}
multilines.extend(&to_add);
}
}
trace!("buffer: {:#?}", buffer.render());
}
if let Some(tracked) = emitted_at {
let track = format!("-Ztrack-diagnostics: created at {tracked}");
let len = buffer.num_lines();
buffer.append(len, &track, Style::NoStyle);
}
// final step: take our styled buffer, render it, then output it
emit_to_destination(&buffer.render(), level, &mut self.dst, self.short_message)?;
Ok(())
}
fn emit_suggestion_default(
&mut self,
span: &MultiSpan,
suggestion: &CodeSuggestion,
args: &FluentArgs<'_>,
level: &Level,
max_line_num_len: usize,
) -> io::Result<()> {
let Some(ref sm) = self.sm else {
return Ok(());
};
// Render the replacements for each suggestion
let suggestions = suggestion.splice_lines(sm);
debug!(?suggestions);
if suggestions.is_empty() {
// Here we check if there are suggestions that have actual code changes. We sometimes
// suggest the same code that is already there, instead of changing how we produce the
// suggestions and filtering there, we just don't emit the suggestion.
// Suggestions coming from macros can also have malformed spans. This is a heavy handed
// approach to avoid ICEs by ignoring the suggestion outright.
return Ok(());
}
let mut buffer = StyledBuffer::new();
// Render the suggestion message
buffer.append(0, level.to_str(), Style::Level(*level));
buffer.append(0, ": ", Style::HeaderMsg);
let mut msg = vec![(suggestion.msg.to_owned(), Style::NoStyle)];
if suggestions
.iter()
.take(MAX_SUGGESTIONS)
.any(|(_, _, _, only_capitalization)| *only_capitalization)
{
msg.push((" (notice the capitalization difference)".into(), Style::NoStyle));
}
self.msgs_to_buffer(
&mut buffer,
&msg,
args,
max_line_num_len,
"suggestion",
Some(Style::HeaderMsg),
);
let mut row_num = 2;
for (i, (complete, parts, highlights, _)) in
suggestions.iter().enumerate().take(MAX_SUGGESTIONS)
{
debug!(?complete, ?parts, ?highlights);
let has_deletion = parts.iter().any(|p| p.is_deletion(sm));
let is_multiline = complete.lines().count() > 1;
if i == 0 {
self.draw_col_separator_start(&mut buffer, row_num - 1, max_line_num_len + 1);
} else {
buffer.puts(
row_num - 1,
max_line_num_len + 1,
self.multi_suggestion_separator(),
Style::LineNumber,
);
}
if let Some(span) = span.primary_span() {
// Compare the primary span of the diagnostic with the span of the suggestion
// being emitted. If they belong to the same file, we don't *need* to show the
// file name, saving in verbosity, but if it *isn't* we do need it, otherwise we're
// telling users to make a change but not clarifying *where*.
let loc = sm.lookup_char_pos(parts[0].span.lo());
if loc.file.name != sm.span_to_filename(span) && loc.file.name.is_real() {
// --> file.rs:line:col
// |
let arrow = self.file_start();
buffer.puts(row_num - 1, 0, arrow, Style::LineNumber);
let filename = sm.filename_for_diagnostics(&loc.file.name);
let offset = sm.doctest_offset_line(&loc.file.name, loc.line);
let message = format!("{}:{}:{}", filename, offset, loc.col.0 + 1);
if row_num == 2 {
let col = usize::max(max_line_num_len + 1, arrow.len());
buffer.puts(1, col, &message, Style::LineAndColumn);
} else {
buffer.append(row_num - 1, &message, Style::LineAndColumn);
}
for _ in 0..max_line_num_len {
buffer.prepend(row_num - 1, " ", Style::NoStyle);
}
self.draw_col_separator_no_space(&mut buffer, row_num, max_line_num_len + 1);
row_num += 1;
}
}
let show_code_change = if has_deletion && !is_multiline {
DisplaySuggestion::Diff
} else if let [part] = &parts[..]
&& part.snippet.ends_with('\n')
&& part.snippet.trim() == complete.trim()
{
// We are adding a line(s) of code before code that was already there.
DisplaySuggestion::Add
} else if (parts.len() != 1 || parts[0].snippet.trim() != complete.trim())
&& !is_multiline
{
DisplaySuggestion::Underline
} else {
DisplaySuggestion::None
};
if let DisplaySuggestion::Diff = show_code_change {
row_num += 1;
}
let file_lines = sm
.span_to_lines(parts[0].span)
.expect("span_to_lines failed when emitting suggestion");
assert!(!file_lines.lines.is_empty() || parts[0].span.is_dummy());
let line_start = sm.lookup_char_pos(parts[0].span.lo()).line;
let mut lines = complete.lines();
if lines.clone().next().is_none() {
// Account for a suggestion to completely remove a line(s) with whitespace (#94192).
let line_end = sm.lookup_char_pos(parts[0].span.hi()).line;
for line in line_start..=line_end {
buffer.puts(
row_num - 1 + line - line_start,
0,
&self.maybe_anonymized(line),
Style::LineNumber,
);
buffer.puts(
row_num - 1 + line - line_start,
max_line_num_len + 1,
"- ",
Style::Removal,
);
buffer.puts(
row_num - 1 + line - line_start,
max_line_num_len + 3,
&normalize_whitespace(&file_lines.file.get_line(line - 1).unwrap()),
Style::Removal,
);
}
row_num += line_end - line_start;
}
let mut unhighlighted_lines = Vec::new();
let mut last_pos = 0;
let mut is_item_attribute = false;
for (line_pos, (line, highlight_parts)) in lines.by_ref().zip(highlights).enumerate() {
last_pos = line_pos;
debug!(%line_pos, %line, ?highlight_parts);
// Remember lines that are not highlighted to hide them if needed
if highlight_parts.is_empty() {
unhighlighted_lines.push((line_pos, line));
continue;
}
if highlight_parts.len() == 1
&& line.trim().starts_with("#[")
&& line.trim().ends_with(']')
{
is_item_attribute = true;
}
match unhighlighted_lines.len() {
0 => (),
// Since we show first line, "..." line and last line,
// There is no reason to hide if there are 3 or less lines
// (because then we just replace a line with ... which is
// not helpful)
n if n <= 3 => unhighlighted_lines.drain(..).for_each(|(p, l)| {
self.draw_code_line(
&mut buffer,
&mut row_num,
&[],
p + line_start,
l,
show_code_change,
max_line_num_len,
&file_lines,
is_multiline,
)
}),
// Print first unhighlighted line, "..." and last unhighlighted line, like so:
//
// LL | this line was highlighted
// LL | this line is just for context
// ...
// LL | this line is just for context
// LL | this line was highlighted
_ => {
let last_line = unhighlighted_lines.pop();
let first_line = unhighlighted_lines.drain(..).next();
if let Some((p, l)) = first_line {
self.draw_code_line(
&mut buffer,
&mut row_num,
&[],
p + line_start,
l,
show_code_change,
max_line_num_len,
&file_lines,
is_multiline,
)
}
let placeholder = self.margin();
let padding = str_width(placeholder);
buffer.puts(
row_num,
max_line_num_len.saturating_sub(padding),
placeholder,
Style::LineNumber,
);
row_num += 1;
if let Some((p, l)) = last_line {
self.draw_code_line(
&mut buffer,
&mut row_num,
&[],
p + line_start,
l,
show_code_change,
max_line_num_len,
&file_lines,
is_multiline,
)
}
}
}
self.draw_code_line(
&mut buffer,
&mut row_num,
highlight_parts,
line_pos + line_start,
line,
show_code_change,
max_line_num_len,
&file_lines,
is_multiline,
)
}
if let DisplaySuggestion::Add = show_code_change
&& is_item_attribute
{
// The suggestion adds an entire line of code, ending on a newline, so we'll also
// print the *following* line, to provide context of what we're advising people to
// do. Otherwise you would only see contextless code that can be confused for
// already existing code, despite the colors and UI elements.
// We special case `#[derive(_)]\n` and other attribute suggestions, because those
// are the ones where context is most useful.
let file_lines = sm
.span_to_lines(parts[0].span.shrink_to_hi())
.expect("span_to_lines failed when emitting suggestion");
let line_num = sm.lookup_char_pos(parts[0].span.lo()).line;
if let Some(line) = file_lines.file.get_line(line_num - 1) {
let line = normalize_whitespace(&line);
self.draw_code_line(
&mut buffer,
&mut row_num,
&[],
line_num + last_pos + 1,
&line,
DisplaySuggestion::None,
max_line_num_len,
&file_lines,
is_multiline,
)
}
}
// This offset and the ones below need to be signed to account for replacement code
// that is shorter than the original code.
let mut offsets: Vec<(usize, isize)> = Vec::new();
// Only show an underline in the suggestions if the suggestion is not the
// entirety of the code being shown and the displayed code is not multiline.
if let DisplaySuggestion::Diff | DisplaySuggestion::Underline | DisplaySuggestion::Add =
show_code_change
{
for part in parts {
let span_start_pos = sm.lookup_char_pos(part.span.lo()).col_display;
let span_end_pos = sm.lookup_char_pos(part.span.hi()).col_display;
// If this addition is _only_ whitespace, then don't trim it,
// or else we're just not rendering anything.
let is_whitespace_addition = part.snippet.trim().is_empty();
// Do not underline the leading...
let start = if is_whitespace_addition {
0
} else {
part.snippet.len().saturating_sub(part.snippet.trim_start().len())
};
// ...or trailing spaces. Account for substitutions containing unicode
// characters.
let sub_len: usize = str_width(if is_whitespace_addition {
&part.snippet
} else {
part.snippet.trim()
});
let offset: isize = offsets
.iter()
.filter_map(
|(start, v)| if span_start_pos < *start { None } else { Some(v) },
)
.sum();
let underline_start = (span_start_pos + start) as isize + offset;
let underline_end = (span_start_pos + start + sub_len) as isize + offset;
assert!(underline_start >= 0 && underline_end >= 0);
let padding: usize = max_line_num_len + 3;
for p in underline_start..underline_end {
if let DisplaySuggestion::Underline = show_code_change
&& is_different(sm, &part.snippet, part.span)
{
// If this is a replacement, underline with `~`, if this is an addition
// underline with `+`.
buffer.putc(
row_num,
(padding as isize + p) as usize,
if part.is_addition(sm) { '+' } else { self.diff() },
Style::Addition,
);
}
}
if let DisplaySuggestion::Diff = show_code_change {
// Colorize removal with red in diff format.
buffer.set_style_range(
row_num - 2,
(padding as isize + span_start_pos as isize) as usize,
(padding as isize + span_end_pos as isize) as usize,
Style::Removal,
true,
);
}
// length of the code after substitution
let full_sub_len = str_width(&part.snippet) as isize;
// length of the code to be substituted
let snippet_len = span_end_pos as isize - span_start_pos as isize;
// For multiple substitutions, use the position *after* the previous
// substitutions have happened, only when further substitutions are
// located strictly after.
offsets.push((span_end_pos, full_sub_len - snippet_len));
}
row_num += 1;
}
// if we elided some lines, add an ellipsis
if lines.next().is_some() {
let placeholder = self.margin();
let padding = str_width(placeholder);
buffer.puts(
row_num,
max_line_num_len.saturating_sub(padding),
placeholder,
Style::LineNumber,
);
} else {
let row = match show_code_change {
DisplaySuggestion::Diff
| DisplaySuggestion::Add
| DisplaySuggestion::Underline => row_num - 1,
DisplaySuggestion::None => row_num,
};
self.draw_col_separator_end(&mut buffer, row, max_line_num_len + 1);
row_num = row + 1;
}
}
if suggestions.len() > MAX_SUGGESTIONS {
let others = suggestions.len() - MAX_SUGGESTIONS;
let msg = format!("and {} other candidate{}", others, pluralize!(others));
buffer.puts(row_num, max_line_num_len + 3, &msg, Style::NoStyle);
}
emit_to_destination(&buffer.render(), level, &mut self.dst, self.short_message)?;
Ok(())
}
#[instrument(level = "trace", skip(self, args, code, children, suggestions))]
fn emit_messages_default(
&mut self,
level: &Level,
messages: &[(DiagMessage, Style)],
args: &FluentArgs<'_>,
code: &Option<ErrCode>,
span: &MultiSpan,
children: &[Subdiag],
suggestions: &[CodeSuggestion],
emitted_at: Option<&DiagLocation>,
) {
let max_line_num_len = if self.ui_testing {
ANONYMIZED_LINE_NUM.len()
} else {
let n = self.get_max_line_num(span, children);
num_decimal_digits(n)
};
match self.emit_messages_default_inner(
span,
messages,
args,
code,
level,
max_line_num_len,
false,
emitted_at,
!children.is_empty()
|| suggestions.iter().any(|s| s.style != SuggestionStyle::CompletelyHidden),
) {
Ok(()) => {
if !children.is_empty()
|| suggestions.iter().any(|s| s.style != SuggestionStyle::CompletelyHidden)
{
let mut buffer = StyledBuffer::new();
if !self.short_message {
if let Some(child) = children.iter().next()
&& child.span.primary_spans().is_empty()
{
// We'll continue the vertical bar to point into the next note.
self.draw_col_separator_no_space(&mut buffer, 0, max_line_num_len + 1);
} else {
// We'll close the vertical bar to visually end the code window.
self.draw_col_separator_end(&mut buffer, 0, max_line_num_len + 1);
}
}
if let Err(e) = emit_to_destination(
&buffer.render(),
level,
&mut self.dst,
self.short_message,
) {
panic!("failed to emit error: {e}")
}
}
if !self.short_message {
for (i, child) in children.iter().enumerate() {
assert!(child.level.can_be_subdiag());
let span = &child.span;
// FIXME: audit that this behaves correctly with suggestions.
let should_close = match children.get(i + 1) {
Some(c) => !c.span.primary_spans().is_empty(),
None => i + 1 == children.len(),
};
if let Err(err) = self.emit_messages_default_inner(
span,
&child.messages,
args,
&None,
&child.level,
max_line_num_len,
true,
None,
!should_close,
) {
panic!("failed to emit error: {err}");
}
}
for (i, sugg) in suggestions.iter().enumerate() {
match sugg.style {
SuggestionStyle::CompletelyHidden => {
// do not display this suggestion, it is meant only for tools
}
SuggestionStyle::HideCodeAlways => {
if let Err(e) = self.emit_messages_default_inner(
&MultiSpan::new(),
&[(sugg.msg.to_owned(), Style::HeaderMsg)],
args,
&None,
&Level::Help,
max_line_num_len,
true,
None,
// FIXME: this needs to account for the suggestion type,
// some don't take any space.
i + 1 != suggestions.len(),
) {
panic!("failed to emit error: {e}");
}
}
SuggestionStyle::HideCodeInline
| SuggestionStyle::ShowCode
| SuggestionStyle::ShowAlways => {
if let Err(e) = self.emit_suggestion_default(
span,
sugg,
args,
&Level::Help,
max_line_num_len,
) {
panic!("failed to emit error: {e}");
}
}
}
}
}
}
Err(e) => panic!("failed to emit error: {e}"),
}
match writeln!(self.dst) {
Err(e) => panic!("failed to emit error: {e}"),
_ => {
if let Err(e) = self.dst.flush() {
panic!("failed to emit error: {e}")
}
}
}
}
fn draw_code_line(
&self,
buffer: &mut StyledBuffer,
row_num: &mut usize,
highlight_parts: &[SubstitutionHighlight],
line_num: usize,
line_to_add: &str,
show_code_change: DisplaySuggestion,
max_line_num_len: usize,
file_lines: &FileLines,
is_multiline: bool,
) {
if let DisplaySuggestion::Diff = show_code_change {
// We need to print more than one line if the span we need to remove is multiline.
// For more info: https://github.com/rust-lang/rust/issues/92741
let lines_to_remove = file_lines.lines.iter().take(file_lines.lines.len() - 1);
for (index, line_to_remove) in lines_to_remove.enumerate() {
buffer.puts(
*row_num - 1,
0,
&self.maybe_anonymized(line_num + index),
Style::LineNumber,
);
buffer.puts(*row_num - 1, max_line_num_len + 1, "- ", Style::Removal);
let line = normalize_whitespace(
&file_lines.file.get_line(line_to_remove.line_index).unwrap(),
);
buffer.puts(*row_num - 1, max_line_num_len + 3, &line, Style::NoStyle);
*row_num += 1;
}
// If the last line is exactly equal to the line we need to add, we can skip both of
// them. This allows us to avoid output like the following:
// 2 - &
// 2 + if true { true } else { false }
// 3 - if true { true } else { false }
// If those lines aren't equal, we print their diff
let last_line_index = file_lines.lines[file_lines.lines.len() - 1].line_index;
let last_line = &file_lines.file.get_line(last_line_index).unwrap();
if last_line != line_to_add {
buffer.puts(
*row_num - 1,
0,
&self.maybe_anonymized(line_num + file_lines.lines.len() - 1),
Style::LineNumber,
);
buffer.puts(*row_num - 1, max_line_num_len + 1, "- ", Style::Removal);
buffer.puts(
*row_num - 1,
max_line_num_len + 3,
&normalize_whitespace(last_line),
Style::NoStyle,
);
if !line_to_add.trim().is_empty() {
// Check if after the removal, the line is left with only whitespace. If so, we
// will not show an "addition" line, as removing the whole line is what the user
// would really want.
// For example, for the following:
// |
// 2 - .await
// 2 + (note the left over whitespace)
// |
// We really want
// |
// 2 - .await
// |
// *row_num -= 1;
buffer.puts(*row_num, 0, &self.maybe_anonymized(line_num), Style::LineNumber);
buffer.puts(*row_num, max_line_num_len + 1, "+ ", Style::Addition);
buffer.append(*row_num, &normalize_whitespace(line_to_add), Style::NoStyle);
} else {
*row_num -= 1;
}
} else {
*row_num -= 2;
}
} else if is_multiline {
buffer.puts(*row_num, 0, &self.maybe_anonymized(line_num), Style::LineNumber);
match &highlight_parts {
[SubstitutionHighlight { start: 0, end }] if *end == line_to_add.len() => {
buffer.puts(*row_num, max_line_num_len + 1, "+ ", Style::Addition);
}
[] => {
// FIXME: needed? Doesn't get excercised in any test.
self.draw_col_separator_no_space(buffer, *row_num, max_line_num_len + 1);
}
_ => {
let diff = self.diff();
buffer.puts(
*row_num,
max_line_num_len + 1,
&format!("{diff} "),
Style::Addition,
);
}
}
// LL | line_to_add
// ++^^^
// | |
// | magic `3`
// `max_line_num_len`
buffer.puts(
*row_num,
max_line_num_len + 3,
&normalize_whitespace(line_to_add),
Style::NoStyle,
);
} else if let DisplaySuggestion::Add = show_code_change {
buffer.puts(*row_num, 0, &self.maybe_anonymized(line_num), Style::LineNumber);
buffer.puts(*row_num, max_line_num_len + 1, "+ ", Style::Addition);
buffer.append(*row_num, &normalize_whitespace(line_to_add), Style::NoStyle);
} else {
buffer.puts(*row_num, 0, &self.maybe_anonymized(line_num), Style::LineNumber);
self.draw_col_separator(buffer, *row_num, max_line_num_len + 1);
buffer.append(*row_num, &normalize_whitespace(line_to_add), Style::NoStyle);
}
// Colorize addition/replacements with green.
for &SubstitutionHighlight { start, end } in highlight_parts {
// This is a no-op for empty ranges
if start != end {
// Account for tabs when highlighting (#87972).
let tabs: usize = line_to_add
.chars()
.take(start)
.map(|ch| match ch {
'\t' => 3,
_ => 0,
})
.sum();
buffer.set_style_range(
*row_num,
max_line_num_len + 3 + start + tabs,
max_line_num_len + 3 + end + tabs,
Style::Addition,
true,
);
}
}
*row_num += 1;
}
fn underline(&self, is_primary: bool) -> UnderlineParts {
// X0 Y0
// label_start > ┯━━━━ < underline
// │ < vertical_text_line
// text
// multiline_start_down ⤷ X0 Y0
// top_left > ┌───╿──┘ < top_right_flat
// top_left > ┏│━━━┙ < top_right
// multiline_vertical > ┃│
// ┃│ X1 Y1
// ┃│ X2 Y2
// ┃└────╿──┘ < multiline_end_same_line
// bottom_left > ┗━━━━━┥ < bottom_right_with_text
// multiline_horizontal ^ `X` is a good letter
// multiline_whole_line > ┏ X0 Y0
// ┃ X1 Y1
// ┗━━━━┛ < multiline_end_same_line
// multiline_whole_line > ┏ X0 Y0
// ┃ X1 Y1
// ┃ ╿ < multiline_end_up
// ┗━━┛ < bottom_right
match (self.theme, is_primary) {
(OutputTheme::Ascii, true) => UnderlineParts {
style: Style::UnderlinePrimary,
underline: '^',
label_start: '^',
vertical_text_line: '|',
multiline_vertical: '|',
multiline_horizontal: '_',
multiline_whole_line: '/',
multiline_start_down: '^',
bottom_right: '|',
top_left: ' ',
top_right_flat: '^',
bottom_left: '|',
multiline_end_up: '^',
multiline_end_same_line: '^',
multiline_bottom_right_with_text: '|',
},
(OutputTheme::Ascii, false) => UnderlineParts {
style: Style::UnderlineSecondary,
underline: '-',
label_start: '-',
vertical_text_line: '|',
multiline_vertical: '|',
multiline_horizontal: '_',
multiline_whole_line: '/',
multiline_start_down: '-',
bottom_right: '|',
top_left: ' ',
top_right_flat: '-',
bottom_left: '|',
multiline_end_up: '-',
multiline_end_same_line: '-',
multiline_bottom_right_with_text: '|',
},
(OutputTheme::Unicode, true) => UnderlineParts {
style: Style::UnderlinePrimary,
underline: '━',
label_start: '┯',
vertical_text_line: '│',
multiline_vertical: '┃',
multiline_horizontal: '━',
multiline_whole_line: '┏',
multiline_start_down: '╿',
bottom_right: '┙',
top_left: '┏',
top_right_flat: '┛',
bottom_left: '┗',
multiline_end_up: '╿',
multiline_end_same_line: '┛',
multiline_bottom_right_with_text: '┥',
},
(OutputTheme::Unicode, false) => UnderlineParts {
style: Style::UnderlineSecondary,
underline: '─',
label_start: '┬',
vertical_text_line: '│',
multiline_vertical: '│',
multiline_horizontal: '─',
multiline_whole_line: '┌',
multiline_start_down: '│',
bottom_right: '┘',
top_left: '┌',
top_right_flat: '┘',
bottom_left: '└',
multiline_end_up: '│',
multiline_end_same_line: '┘',
multiline_bottom_right_with_text: '┤',
},
}
}
fn col_separator(&self) -> char {
match self.theme {
OutputTheme::Ascii => '|',
OutputTheme::Unicode => '│',
}
}
fn note_separator(&self) -> char {
match self.theme {
OutputTheme::Ascii => '=',
OutputTheme::Unicode => '╰',
}
}
fn multi_suggestion_separator(&self) -> &'static str {
match self.theme {
OutputTheme::Ascii => "|",
OutputTheme::Unicode => "├╴",
}
}
fn draw_col_separator(&self, buffer: &mut StyledBuffer, line: usize, col: usize) {
let chr = self.col_separator();
buffer.puts(line, col, &format!("{chr} "), Style::LineNumber);
}
fn draw_col_separator_no_space(&self, buffer: &mut StyledBuffer, line: usize, col: usize) {
let chr = self.col_separator();
self.draw_col_separator_no_space_with_style(buffer, chr, line, col, Style::LineNumber);
}
fn draw_col_separator_start(&self, buffer: &mut StyledBuffer, line: usize, col: usize) {
match self.theme {
OutputTheme::Ascii => {
self.draw_col_separator_no_space_with_style(
buffer,
'|',
line,
col,
Style::LineNumber,
);
}
OutputTheme::Unicode => {
self.draw_col_separator_no_space_with_style(
buffer,
'╭',
line,
col,
Style::LineNumber,
);
self.draw_col_separator_no_space_with_style(
buffer,
'╴',
line,
col + 1,
Style::LineNumber,
);
}
}
}
fn draw_col_separator_end(&self, buffer: &mut StyledBuffer, line: usize, col: usize) {
match self.theme {
OutputTheme::Ascii => {
self.draw_col_separator_no_space_with_style(
buffer,
'|',
line,
col,
Style::LineNumber,
);
}
OutputTheme::Unicode => {
self.draw_col_separator_no_space_with_style(
buffer,
'╰',
line,
col,
Style::LineNumber,
);
self.draw_col_separator_no_space_with_style(
buffer,
'╴',
line,
col + 1,
Style::LineNumber,
);
}
}
}
fn draw_col_separator_no_space_with_style(
&self,
buffer: &mut StyledBuffer,
chr: char,
line: usize,
col: usize,
style: Style,
) {
buffer.putc(line, col, chr, style);
}
fn draw_range(
&self,
buffer: &mut StyledBuffer,
symbol: char,
line: usize,
col_from: usize,
col_to: usize,
style: Style,
) {
for col in col_from..col_to {
buffer.putc(line, col, symbol, style);
}
}
fn draw_note_separator(
&self,
buffer: &mut StyledBuffer,
line: usize,
col: usize,
is_cont: bool,
) {
let chr = match self.theme {
OutputTheme::Ascii => "= ",
OutputTheme::Unicode if is_cont => "├ ",
OutputTheme::Unicode => "╰ ",
};
buffer.puts(line, col, chr, Style::LineNumber);
}
fn draw_multiline_line(
&self,
buffer: &mut StyledBuffer,
line: usize,
offset: usize,
depth: usize,
style: Style,
) {
let chr = match (style, self.theme) {
(Style::UnderlinePrimary | Style::LabelPrimary, OutputTheme::Ascii) => '|',
(_, OutputTheme::Ascii) => '|',
(Style::UnderlinePrimary | Style::LabelPrimary, OutputTheme::Unicode) => '┃',
(_, OutputTheme::Unicode) => '│',
};
buffer.putc(line, offset + depth - 1, chr, style);
}
fn file_start(&self) -> &'static str {
match self.theme {
OutputTheme::Ascii => "--> ",
OutputTheme::Unicode => " ╭▸ ",
}
}
fn secondary_file_start(&self) -> &'static str {
match self.theme {
OutputTheme::Ascii => "::: ",
OutputTheme::Unicode => " ⸬ ",
}
}
fn diff(&self) -> char {
match self.theme {
OutputTheme::Ascii => '~',
OutputTheme::Unicode => '±',
}
}
fn draw_line_separator(&self, buffer: &mut StyledBuffer, line: usize, col: usize) {
let (column, dots) = match self.theme {
OutputTheme::Ascii => (0, "..."),
OutputTheme::Unicode => (col - 2, "‡"),
};
buffer.puts(line, column, dots, Style::LineNumber);
}
fn margin(&self) -> &'static str {
match self.theme {
OutputTheme::Ascii => "...",
OutputTheme::Unicode => "…",
}
}
}
#[derive(Debug, Clone, Copy)]
struct UnderlineParts {
style: Style,
underline: char,
label_start: char,
vertical_text_line: char,
multiline_vertical: char,
multiline_horizontal: char,
multiline_whole_line: char,
multiline_start_down: char,
bottom_right: char,
top_left: char,
top_right_flat: char,
bottom_left: char,
multiline_end_up: char,
multiline_end_same_line: char,
multiline_bottom_right_with_text: char,
}
#[derive(Clone, Copy, Debug)]
enum DisplaySuggestion {
Underline,
Diff,
None,
Add,
}
impl FileWithAnnotatedLines {
/// Preprocess all the annotations so that they are grouped by file and by line number
/// This helps us quickly iterate over the whole message (including secondary file spans)
pub(crate) fn collect_annotations(
emitter: &dyn Emitter,
args: &FluentArgs<'_>,
msp: &MultiSpan,
) -> Vec<FileWithAnnotatedLines> {
fn add_annotation_to_file(
file_vec: &mut Vec<FileWithAnnotatedLines>,
file: Lrc<SourceFile>,
line_index: usize,
ann: Annotation,
) {
for slot in file_vec.iter_mut() {
// Look through each of our files for the one we're adding to
if slot.file.name == file.name {
// See if we already have a line for it
for line_slot in &mut slot.lines {
if line_slot.line_index == line_index {
line_slot.annotations.push(ann);
return;
}
}
// We don't have a line yet, create one
slot.lines.push(Line { line_index, annotations: vec![ann] });
slot.lines.sort();
return;
}
}
// This is the first time we're seeing the file
file_vec.push(FileWithAnnotatedLines {
file,
lines: vec![Line { line_index, annotations: vec![ann] }],
multiline_depth: 0,
});
}
let mut output = vec![];
let mut multiline_annotations = vec![];
if let Some(sm) = emitter.source_map() {
for SpanLabel { span, is_primary, label } in msp.span_labels() {
// If we don't have a useful span, pick the primary span if that exists.
// Worst case we'll just print an error at the top of the main file.
let span = match (span.is_dummy(), msp.primary_span()) {
(_, None) | (false, _) => span,
(true, Some(span)) => span,
};
let lo = sm.lookup_char_pos(span.lo());
let mut hi = sm.lookup_char_pos(span.hi());
// Watch out for "empty spans". If we get a span like 6..6, we
// want to just display a `^` at 6, so convert that to
// 6..7. This is degenerate input, but it's best to degrade
// gracefully -- and the parser likes to supply a span like
// that for EOF, in particular.
if lo.col_display == hi.col_display && lo.line == hi.line {
hi.col_display += 1;
}
let label = label.as_ref().map(|m| {
normalize_whitespace(
&emitter.translate_message(m, args).map_err(Report::new).unwrap(),
)
});
if lo.line != hi.line {
let ml = MultilineAnnotation {
depth: 1,
line_start: lo.line,
line_end: hi.line,
start_col: AnnotationColumn::from_loc(&lo),
end_col: AnnotationColumn::from_loc(&hi),
is_primary,
label,
overlaps_exactly: false,
};
multiline_annotations.push((lo.file, ml));
} else {
let ann = Annotation {
start_col: AnnotationColumn::from_loc(&lo),
end_col: AnnotationColumn::from_loc(&hi),
is_primary,
label,
annotation_type: AnnotationType::Singleline,
};
add_annotation_to_file(&mut output, lo.file, lo.line, ann);
};
}
}
// Find overlapping multiline annotations, put them at different depths
multiline_annotations.sort_by_key(|(_, ml)| (ml.line_start, usize::MAX - ml.line_end));
for (_, ann) in multiline_annotations.clone() {
for (_, a) in multiline_annotations.iter_mut() {
// Move all other multiline annotations overlapping with this one
// one level to the right.
if !(ann.same_span(a))
&& num_overlap(ann.line_start, ann.line_end, a.line_start, a.line_end, true)
{
a.increase_depth();
} else if ann.same_span(a) && &ann != a {
a.overlaps_exactly = true;
} else {
break;
}
}
}
let mut max_depth = 0; // max overlapping multiline spans
for (_, ann) in &multiline_annotations {
max_depth = max(max_depth, ann.depth);
}
// Change order of multispan depth to minimize the number of overlaps in the ASCII art.
for (_, a) in multiline_annotations.iter_mut() {
a.depth = max_depth - a.depth + 1;
}
for (file, ann) in multiline_annotations {
let mut end_ann = ann.as_end();
if !ann.overlaps_exactly {
// avoid output like
//
// | foo(
// | _____^
// | |_____|
// | || bar,
// | || );
// | || ^
// | ||______|
// | |______foo
// | baz
//
// and instead get
//
// | foo(
// | _____^
// | | bar,
// | | );
// | | ^
// | | |
// | |______foo
// | baz
add_annotation_to_file(
&mut output,
Lrc::clone(&file),
ann.line_start,
ann.as_start(),
);
// 4 is the minimum vertical length of a multiline span when presented: two lines
// of code and two lines of underline. This is not true for the special case where
// the beginning doesn't have an underline, but the current logic seems to be
// working correctly.
let middle = min(ann.line_start + 4, ann.line_end);
// We'll show up to 4 lines past the beginning of the multispan start.
// We will *not* include the tail of lines that are only whitespace.
let until = (ann.line_start..middle)
.rev()
.filter_map(|line| file.get_line(line - 1).map(|s| (line + 1, s)))
.find(|(_, s)| !s.trim().is_empty())
.map(|(line, _)| line)
.unwrap_or(ann.line_start);
for line in ann.line_start + 1..until {
// Every `|` that joins the beginning of the span (`___^`) to the end (`|__^`).
add_annotation_to_file(&mut output, Lrc::clone(&file), line, ann.as_line());
}
let line_end = ann.line_end - 1;
if middle < line_end {
add_annotation_to_file(&mut output, Lrc::clone(&file), line_end, ann.as_line());
}
} else {
end_ann.annotation_type = AnnotationType::Singleline;
}
add_annotation_to_file(&mut output, file, ann.line_end, end_ann);
}
for file_vec in output.iter_mut() {
file_vec.multiline_depth = max_depth;
}
output
}
}
// instead of taking the String length or dividing by 10 while > 0, we multiply a limit by 10 until
// we're higher. If the loop isn't exited by the `return`, the last multiplication will wrap, which
// is OK, because while we cannot fit a higher power of 10 in a usize, the loop will end anyway.
// This is also why we need the max number of decimal digits within a `usize`.
fn num_decimal_digits(num: usize) -> usize {
#[cfg(target_pointer_width = "64")]
const MAX_DIGITS: usize = 20;
#[cfg(target_pointer_width = "32")]
const MAX_DIGITS: usize = 10;
#[cfg(target_pointer_width = "16")]
const MAX_DIGITS: usize = 5;
let mut lim = 10;
for num_digits in 1..MAX_DIGITS {
if num < lim {
return num_digits;
}
lim = lim.wrapping_mul(10);
}
MAX_DIGITS
}
// We replace some characters so the CLI output is always consistent and underlines aligned.
// Keep the following list in sync with `rustc_span::char_width`.
const OUTPUT_REPLACEMENTS: &[(char, &str)] = &[
// In terminals without Unicode support the following will be garbled, but in *all* terminals
// the underlying codepoint will be as well. We could gate this replacement behind a "unicode
// support" gate.
('\0', "␀"),
('\u{0001}', "␁"),
('\u{0002}', "␂"),
('\u{0003}', "␃"),
('\u{0004}', "␄"),
('\u{0005}', "␅"),
('\u{0006}', "␆"),
('\u{0007}', "␇"),
('\u{0008}', "␈"),
('\t', " "), // We do our own tab replacement
('\u{000b}', "␋"),
('\u{000c}', "␌"),
('\u{000d}', "␍"),
('\u{000e}', "␎"),
('\u{000f}', "␏"),
('\u{0010}', "␐"),
('\u{0011}', "␑"),
('\u{0012}', "␒"),
('\u{0013}', "␓"),
('\u{0014}', "␔"),
('\u{0015}', "␕"),
('\u{0016}', "␖"),
('\u{0017}', "␗"),
('\u{0018}', "␘"),
('\u{0019}', "␙"),
('\u{001a}', "␚"),
('\u{001b}', "␛"),
('\u{001c}', "␜"),
('\u{001d}', "␝"),
('\u{001e}', "␞"),
('\u{001f}', "␟"),
('\u{007f}', "␡"),
('\u{200d}', ""), // Replace ZWJ for consistent terminal output of grapheme clusters.
('\u{202a}', "�"), // The following unicode text flow control characters are inconsistently
('\u{202b}', "�"), // supported across CLIs and can cause confusion due to the bytes on disk
('\u{202c}', "�"), // not corresponding to the visible source code, so we replace them always.
('\u{202d}', "�"),
('\u{202e}', "�"),
('\u{2066}', "�"),
('\u{2067}', "�"),
('\u{2068}', "�"),
('\u{2069}', "�"),
];
fn normalize_whitespace(s: &str) -> String {
const {
let mut i = 1;
while i < OUTPUT_REPLACEMENTS.len() {
assert!(
OUTPUT_REPLACEMENTS[i - 1].0 < OUTPUT_REPLACEMENTS[i].0,
"The OUTPUT_REPLACEMENTS array must be sorted (for binary search to work) \
and must contain no duplicate entries"
);
i += 1;
}
}
// Scan the input string for a character in the ordered table above.
// If it's present, replace it with its alternative string (it can be more than 1 char!).
// Otherwise, retain the input char.
s.chars().fold(String::with_capacity(s.len()), |mut s, c| {
match OUTPUT_REPLACEMENTS.binary_search_by_key(&c, |(k, _)| *k) {
Ok(i) => s.push_str(OUTPUT_REPLACEMENTS[i].1),
_ => s.push(c),
}
s
})
}
fn num_overlap(
a_start: usize,
a_end: usize,
b_start: usize,
b_end: usize,
inclusive: bool,
) -> bool {
let extra = if inclusive { 1 } else { 0 };
(b_start..b_end + extra).contains(&a_start) || (a_start..a_end + extra).contains(&b_start)
}
fn overlaps(a1: &Annotation, a2: &Annotation, padding: usize) -> bool {
num_overlap(
a1.start_col.display,
a1.end_col.display + padding,
a2.start_col.display,
a2.end_col.display,
false,
)
}
fn emit_to_destination(
rendered_buffer: &[Vec<StyledString>],
lvl: &Level,
dst: &mut Destination,
short_message: bool,
) -> io::Result<()> {
use crate::lock;
// In order to prevent error message interleaving, where multiple error lines get intermixed
// when multiple compiler processes error simultaneously, we emit errors with additional
// steps.
//
// On Unix systems, we write into a buffered terminal rather than directly to a terminal. When
// the .flush() is called we take the buffer created from the buffered writes and write it at
// one shot. Because the Unix systems use ANSI for the colors, which is a text-based styling
// scheme, this buffered approach works and maintains the styling.
//
// On Windows, styling happens through calls to a terminal API. This prevents us from using the
// same buffering approach. Instead, we use a global Windows mutex, which we acquire long
// enough to output the full error message, then we release.
let _buffer_lock = lock::acquire_global_lock("rustc_errors");
for (pos, line) in rendered_buffer.iter().enumerate() {
for part in line {
let style = part.style.color_spec(*lvl);
dst.set_color(&style)?;
write!(dst, "{}", part.text)?;
dst.reset()?;
}
if !short_message && (!lvl.is_failure_note() || pos != rendered_buffer.len() - 1) {
writeln!(dst)?;
}
}
dst.flush()?;
Ok(())
}
pub type Destination = Box<dyn WriteColor + Send>;
struct Buffy {
buffer_writer: BufferWriter,
buffer: Buffer,
}
impl Write for Buffy {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.buffer.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
self.buffer_writer.print(&self.buffer)?;
self.buffer.clear();
Ok(())
}
}
impl Drop for Buffy {
fn drop(&mut self) {
if !self.buffer.is_empty() {
self.flush().unwrap();
panic!("buffers need to be flushed in order to print their contents");
}
}
}
impl WriteColor for Buffy {
fn supports_color(&self) -> bool {
self.buffer.supports_color()
}
fn set_color(&mut self, spec: &ColorSpec) -> io::Result<()> {
self.buffer.set_color(spec)
}
fn reset(&mut self) -> io::Result<()> {
self.buffer.reset()
}
}
pub fn stderr_destination(color: ColorConfig) -> Destination {
let choice = color.to_color_choice();
// On Windows we'll be performing global synchronization on the entire
// system for emitting rustc errors, so there's no need to buffer
// anything.
//
// On non-Windows we rely on the atomicity of `write` to ensure errors
// don't get all jumbled up.
if cfg!(windows) {
Box::new(StandardStream::stderr(choice))
} else {
let buffer_writer = BufferWriter::stderr(choice);
let buffer = buffer_writer.buffer();
Box::new(Buffy { buffer_writer, buffer })
}
}
/// On Windows, BRIGHT_BLUE is hard to read on black. Use cyan instead.
///
/// See #36178.
const BRIGHT_BLUE: Color = if cfg!(windows) { Color::Cyan } else { Color::Blue };
impl Style {
fn color_spec(&self, lvl: Level) -> ColorSpec {
let mut spec = ColorSpec::new();
match self {
Style::Addition => {
spec.set_fg(Some(Color::Green)).set_intense(true);
}
Style::Removal => {
spec.set_fg(Some(Color::Red)).set_intense(true);
}
Style::LineAndColumn => {}
Style::LineNumber => {
spec.set_bold(true);
spec.set_intense(true);
spec.set_fg(Some(BRIGHT_BLUE));
}
Style::Quotation => {}
Style::MainHeaderMsg => {
spec.set_bold(true);
if cfg!(windows) {
spec.set_intense(true).set_fg(Some(Color::White));
}
}
Style::UnderlinePrimary | Style::LabelPrimary => {
spec = lvl.color();
spec.set_bold(true);
}
Style::UnderlineSecondary | Style::LabelSecondary => {
spec.set_bold(true).set_intense(true);
spec.set_fg(Some(BRIGHT_BLUE));
}
Style::HeaderMsg | Style::NoStyle => {}
Style::Level(lvl) => {
spec = lvl.color();
spec.set_bold(true);
}
Style::Highlight => {
spec.set_bold(true).set_fg(Some(Color::Magenta));
}
}
spec
}
}
/// Whether the original and suggested code are the same.
pub fn is_different(sm: &SourceMap, suggested: &str, sp: Span) -> bool {
let found = match sm.span_to_snippet(sp) {
Ok(snippet) => snippet,
Err(e) => {
warn!(error = ?e, "Invalid span {:?}", sp);
return true;
}
};
found != suggested
}
/// Whether the original and suggested code are visually similar enough to warrant extra wording.
pub fn is_case_difference(sm: &SourceMap, suggested: &str, sp: Span) -> bool {
// FIXME: this should probably be extended to also account for `FO0` → `FOO` and unicode.
let found = match sm.span_to_snippet(sp) {
Ok(snippet) => snippet,
Err(e) => {
warn!(error = ?e, "Invalid span {:?}", sp);
return false;
}
};
let ascii_confusables = &['c', 'f', 'i', 'k', 'o', 's', 'u', 'v', 'w', 'x', 'y', 'z'];
// All the chars that differ in capitalization are confusable (above):
let confusable = iter::zip(found.chars(), suggested.chars())
.filter(|(f, s)| f != s)
.all(|(f, s)| (ascii_confusables.contains(&f) || ascii_confusables.contains(&s)));
confusable && found.to_lowercase() == suggested.to_lowercase()
// FIXME: We sometimes suggest the same thing we already have, which is a
// bug, but be defensive against that here.
&& found != suggested
}
pub(crate) fn should_show_source_code(
ignored_directories: &[String],
sm: &SourceMap,
file: &SourceFile,
) -> bool {
if !sm.ensure_source_file_source_present(file) {
return false;
}
let FileName::Real(name) = &file.name else { return true };
name.local_path()
.map(|path| ignored_directories.iter().all(|dir| !path.starts_with(dir)))
.unwrap_or(true)
}