reverse.js 9.6 KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", { value: true });
  3. exports.reversePatch = void 0;
  4. const parse_1 = require("./parse");
  5. const assertNever_1 = require("../assertNever");
  6. function reverseHunk(hunk) {
  7. const header = {
  8. original: hunk.header.patched,
  9. patched: hunk.header.original,
  10. };
  11. const parts = [];
  12. for (const part of hunk.parts) {
  13. switch (part.type) {
  14. case "context":
  15. parts.push(part);
  16. break;
  17. case "deletion":
  18. parts.push({
  19. type: "insertion",
  20. lines: part.lines,
  21. noNewlineAtEndOfFile: part.noNewlineAtEndOfFile,
  22. });
  23. break;
  24. case "insertion":
  25. parts.push({
  26. type: "deletion",
  27. lines: part.lines,
  28. noNewlineAtEndOfFile: part.noNewlineAtEndOfFile,
  29. });
  30. break;
  31. default:
  32. assertNever_1.assertNever(part.type);
  33. }
  34. }
  35. // swap insertions and deletions over so deletions always come first
  36. for (let i = 0; i < parts.length - 1; i++) {
  37. if (parts[i].type === "insertion" && parts[i + 1].type === "deletion") {
  38. const tmp = parts[i];
  39. parts[i] = parts[i + 1];
  40. parts[i + 1] = tmp;
  41. i += 1;
  42. }
  43. }
  44. const result = {
  45. header,
  46. parts,
  47. source: hunk.source,
  48. };
  49. parse_1.verifyHunkIntegrity(result);
  50. return result;
  51. }
  52. function reversePatchPart(part) {
  53. switch (part.type) {
  54. case "file creation":
  55. return {
  56. type: "file deletion",
  57. path: part.path,
  58. hash: part.hash,
  59. hunk: part.hunk && reverseHunk(part.hunk),
  60. mode: part.mode,
  61. };
  62. case "file deletion":
  63. return {
  64. type: "file creation",
  65. path: part.path,
  66. hunk: part.hunk && reverseHunk(part.hunk),
  67. mode: part.mode,
  68. hash: part.hash,
  69. };
  70. case "rename":
  71. return {
  72. type: "rename",
  73. fromPath: part.toPath,
  74. toPath: part.fromPath,
  75. };
  76. case "patch":
  77. return {
  78. type: "patch",
  79. path: part.path,
  80. hunks: part.hunks.map(reverseHunk),
  81. beforeHash: part.afterHash,
  82. afterHash: part.beforeHash,
  83. };
  84. case "mode change":
  85. return {
  86. type: "mode change",
  87. path: part.path,
  88. newMode: part.oldMode,
  89. oldMode: part.newMode,
  90. };
  91. }
  92. }
  93. const reversePatch = (patch) => {
  94. return patch.map(reversePatchPart).reverse();
  95. };
  96. exports.reversePatch = reversePatch;
  97. //# 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