Samuel Shuert | 274a4d6 | 2023-12-01 15:04:55 -0500 | [diff] [blame] | 1 | /*istanbul ignore start*/ |
| 2 | "use strict"; |
| 3 | |
| 4 | Object.defineProperty(exports, "__esModule", { |
| 5 | value: true |
| 6 | }); |
| 7 | exports.calcLineCount = calcLineCount; |
| 8 | exports.merge = merge; |
| 9 | |
| 10 | /*istanbul ignore end*/ |
| 11 | var |
| 12 | /*istanbul ignore start*/ |
| 13 | _create = require("./create") |
| 14 | /*istanbul ignore end*/ |
| 15 | ; |
| 16 | |
| 17 | var |
| 18 | /*istanbul ignore start*/ |
| 19 | _parse = require("./parse") |
| 20 | /*istanbul ignore end*/ |
| 21 | ; |
| 22 | |
| 23 | var |
| 24 | /*istanbul ignore start*/ |
| 25 | _array = require("../util/array") |
| 26 | /*istanbul ignore end*/ |
| 27 | ; |
| 28 | |
| 29 | /*istanbul ignore start*/ function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); } |
| 30 | |
| 31 | function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance"); } |
| 32 | |
| 33 | function _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter); } |
| 34 | |
| 35 | function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } } |
| 36 | |
| 37 | /*istanbul ignore end*/ |
| 38 | function calcLineCount(hunk) { |
| 39 | /*istanbul ignore start*/ |
| 40 | var _calcOldNewLineCount = |
| 41 | /*istanbul ignore end*/ |
| 42 | calcOldNewLineCount(hunk.lines), |
| 43 | oldLines = _calcOldNewLineCount.oldLines, |
| 44 | newLines = _calcOldNewLineCount.newLines; |
| 45 | |
| 46 | if (oldLines !== undefined) { |
| 47 | hunk.oldLines = oldLines; |
| 48 | } else { |
| 49 | delete hunk.oldLines; |
| 50 | } |
| 51 | |
| 52 | if (newLines !== undefined) { |
| 53 | hunk.newLines = newLines; |
| 54 | } else { |
| 55 | delete hunk.newLines; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | function merge(mine, theirs, base) { |
| 60 | mine = loadPatch(mine, base); |
| 61 | theirs = loadPatch(theirs, base); |
| 62 | var ret = {}; // For index we just let it pass through as it doesn't have any necessary meaning. |
| 63 | // Leaving sanity checks on this to the API consumer that may know more about the |
| 64 | // meaning in their own context. |
| 65 | |
| 66 | if (mine.index || theirs.index) { |
| 67 | ret.index = mine.index || theirs.index; |
| 68 | } |
| 69 | |
| 70 | if (mine.newFileName || theirs.newFileName) { |
| 71 | if (!fileNameChanged(mine)) { |
| 72 | // No header or no change in ours, use theirs (and ours if theirs does not exist) |
| 73 | ret.oldFileName = theirs.oldFileName || mine.oldFileName; |
| 74 | ret.newFileName = theirs.newFileName || mine.newFileName; |
| 75 | ret.oldHeader = theirs.oldHeader || mine.oldHeader; |
| 76 | ret.newHeader = theirs.newHeader || mine.newHeader; |
| 77 | } else if (!fileNameChanged(theirs)) { |
| 78 | // No header or no change in theirs, use ours |
| 79 | ret.oldFileName = mine.oldFileName; |
| 80 | ret.newFileName = mine.newFileName; |
| 81 | ret.oldHeader = mine.oldHeader; |
| 82 | ret.newHeader = mine.newHeader; |
| 83 | } else { |
| 84 | // Both changed... figure it out |
| 85 | ret.oldFileName = selectField(ret, mine.oldFileName, theirs.oldFileName); |
| 86 | ret.newFileName = selectField(ret, mine.newFileName, theirs.newFileName); |
| 87 | ret.oldHeader = selectField(ret, mine.oldHeader, theirs.oldHeader); |
| 88 | ret.newHeader = selectField(ret, mine.newHeader, theirs.newHeader); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | ret.hunks = []; |
| 93 | var mineIndex = 0, |
| 94 | theirsIndex = 0, |
| 95 | mineOffset = 0, |
| 96 | theirsOffset = 0; |
| 97 | |
| 98 | while (mineIndex < mine.hunks.length || theirsIndex < theirs.hunks.length) { |
| 99 | var mineCurrent = mine.hunks[mineIndex] || { |
| 100 | oldStart: Infinity |
| 101 | }, |
| 102 | theirsCurrent = theirs.hunks[theirsIndex] || { |
| 103 | oldStart: Infinity |
| 104 | }; |
| 105 | |
| 106 | if (hunkBefore(mineCurrent, theirsCurrent)) { |
| 107 | // This patch does not overlap with any of the others, yay. |
| 108 | ret.hunks.push(cloneHunk(mineCurrent, mineOffset)); |
| 109 | mineIndex++; |
| 110 | theirsOffset += mineCurrent.newLines - mineCurrent.oldLines; |
| 111 | } else if (hunkBefore(theirsCurrent, mineCurrent)) { |
| 112 | // This patch does not overlap with any of the others, yay. |
| 113 | ret.hunks.push(cloneHunk(theirsCurrent, theirsOffset)); |
| 114 | theirsIndex++; |
| 115 | mineOffset += theirsCurrent.newLines - theirsCurrent.oldLines; |
| 116 | } else { |
| 117 | // Overlap, merge as best we can |
| 118 | var mergedHunk = { |
| 119 | oldStart: Math.min(mineCurrent.oldStart, theirsCurrent.oldStart), |
| 120 | oldLines: 0, |
| 121 | newStart: Math.min(mineCurrent.newStart + mineOffset, theirsCurrent.oldStart + theirsOffset), |
| 122 | newLines: 0, |
| 123 | lines: [] |
| 124 | }; |
| 125 | mergeLines(mergedHunk, mineCurrent.oldStart, mineCurrent.lines, theirsCurrent.oldStart, theirsCurrent.lines); |
| 126 | theirsIndex++; |
| 127 | mineIndex++; |
| 128 | ret.hunks.push(mergedHunk); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | return ret; |
| 133 | } |
| 134 | |
| 135 | function loadPatch(param, base) { |
| 136 | if (typeof param === 'string') { |
| 137 | if (/^@@/m.test(param) || /^Index:/m.test(param)) { |
| 138 | return ( |
| 139 | /*istanbul ignore start*/ |
| 140 | (0, |
| 141 | /*istanbul ignore end*/ |
| 142 | |
| 143 | /*istanbul ignore start*/ |
| 144 | _parse |
| 145 | /*istanbul ignore end*/ |
| 146 | . |
| 147 | /*istanbul ignore start*/ |
| 148 | parsePatch) |
| 149 | /*istanbul ignore end*/ |
| 150 | (param)[0] |
| 151 | ); |
| 152 | } |
| 153 | |
| 154 | if (!base) { |
| 155 | throw new Error('Must provide a base reference or pass in a patch'); |
| 156 | } |
| 157 | |
| 158 | return ( |
| 159 | /*istanbul ignore start*/ |
| 160 | (0, |
| 161 | /*istanbul ignore end*/ |
| 162 | |
| 163 | /*istanbul ignore start*/ |
| 164 | _create |
| 165 | /*istanbul ignore end*/ |
| 166 | . |
| 167 | /*istanbul ignore start*/ |
| 168 | structuredPatch) |
| 169 | /*istanbul ignore end*/ |
| 170 | (undefined, undefined, base, param) |
| 171 | ); |
| 172 | } |
| 173 | |
| 174 | return param; |
| 175 | } |
| 176 | |
| 177 | function fileNameChanged(patch) { |
| 178 | return patch.newFileName && patch.newFileName !== patch.oldFileName; |
| 179 | } |
| 180 | |
| 181 | function selectField(index, mine, theirs) { |
| 182 | if (mine === theirs) { |
| 183 | return mine; |
| 184 | } else { |
| 185 | index.conflict = true; |
| 186 | return { |
| 187 | mine: mine, |
| 188 | theirs: theirs |
| 189 | }; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | function hunkBefore(test, check) { |
| 194 | return test.oldStart < check.oldStart && test.oldStart + test.oldLines < check.oldStart; |
| 195 | } |
| 196 | |
| 197 | function cloneHunk(hunk, offset) { |
| 198 | return { |
| 199 | oldStart: hunk.oldStart, |
| 200 | oldLines: hunk.oldLines, |
| 201 | newStart: hunk.newStart + offset, |
| 202 | newLines: hunk.newLines, |
| 203 | lines: hunk.lines |
| 204 | }; |
| 205 | } |
| 206 | |
| 207 | function mergeLines(hunk, mineOffset, mineLines, theirOffset, theirLines) { |
| 208 | // This will generally result in a conflicted hunk, but there are cases where the context |
| 209 | // is the only overlap where we can successfully merge the content here. |
| 210 | var mine = { |
| 211 | offset: mineOffset, |
| 212 | lines: mineLines, |
| 213 | index: 0 |
| 214 | }, |
| 215 | their = { |
| 216 | offset: theirOffset, |
| 217 | lines: theirLines, |
| 218 | index: 0 |
| 219 | }; // Handle any leading content |
| 220 | |
| 221 | insertLeading(hunk, mine, their); |
| 222 | insertLeading(hunk, their, mine); // Now in the overlap content. Scan through and select the best changes from each. |
| 223 | |
| 224 | while (mine.index < mine.lines.length && their.index < their.lines.length) { |
| 225 | var mineCurrent = mine.lines[mine.index], |
| 226 | theirCurrent = their.lines[their.index]; |
| 227 | |
| 228 | if ((mineCurrent[0] === '-' || mineCurrent[0] === '+') && (theirCurrent[0] === '-' || theirCurrent[0] === '+')) { |
| 229 | // Both modified ... |
| 230 | mutualChange(hunk, mine, their); |
| 231 | } else if (mineCurrent[0] === '+' && theirCurrent[0] === ' ') { |
| 232 | /*istanbul ignore start*/ |
| 233 | var _hunk$lines; |
| 234 | |
| 235 | /*istanbul ignore end*/ |
| 236 | // Mine inserted |
| 237 | |
| 238 | /*istanbul ignore start*/ |
| 239 | (_hunk$lines = |
| 240 | /*istanbul ignore end*/ |
| 241 | hunk.lines).push. |
| 242 | /*istanbul ignore start*/ |
| 243 | apply |
| 244 | /*istanbul ignore end*/ |
| 245 | ( |
| 246 | /*istanbul ignore start*/ |
| 247 | _hunk$lines |
| 248 | /*istanbul ignore end*/ |
| 249 | , |
| 250 | /*istanbul ignore start*/ |
| 251 | _toConsumableArray( |
| 252 | /*istanbul ignore end*/ |
| 253 | collectChange(mine))); |
| 254 | } else if (theirCurrent[0] === '+' && mineCurrent[0] === ' ') { |
| 255 | /*istanbul ignore start*/ |
| 256 | var _hunk$lines2; |
| 257 | |
| 258 | /*istanbul ignore end*/ |
| 259 | // Theirs inserted |
| 260 | |
| 261 | /*istanbul ignore start*/ |
| 262 | (_hunk$lines2 = |
| 263 | /*istanbul ignore end*/ |
| 264 | hunk.lines).push. |
| 265 | /*istanbul ignore start*/ |
| 266 | apply |
| 267 | /*istanbul ignore end*/ |
| 268 | ( |
| 269 | /*istanbul ignore start*/ |
| 270 | _hunk$lines2 |
| 271 | /*istanbul ignore end*/ |
| 272 | , |
| 273 | /*istanbul ignore start*/ |
| 274 | _toConsumableArray( |
| 275 | /*istanbul ignore end*/ |
| 276 | collectChange(their))); |
| 277 | } else if (mineCurrent[0] === '-' && theirCurrent[0] === ' ') { |
| 278 | // Mine removed or edited |
| 279 | removal(hunk, mine, their); |
| 280 | } else if (theirCurrent[0] === '-' && mineCurrent[0] === ' ') { |
| 281 | // Their removed or edited |
| 282 | removal(hunk, their, mine, true); |
| 283 | } else if (mineCurrent === theirCurrent) { |
| 284 | // Context identity |
| 285 | hunk.lines.push(mineCurrent); |
| 286 | mine.index++; |
| 287 | their.index++; |
| 288 | } else { |
| 289 | // Context mismatch |
| 290 | conflict(hunk, collectChange(mine), collectChange(their)); |
| 291 | } |
| 292 | } // Now push anything that may be remaining |
| 293 | |
| 294 | |
| 295 | insertTrailing(hunk, mine); |
| 296 | insertTrailing(hunk, their); |
| 297 | calcLineCount(hunk); |
| 298 | } |
| 299 | |
| 300 | function mutualChange(hunk, mine, their) { |
| 301 | var myChanges = collectChange(mine), |
| 302 | theirChanges = collectChange(their); |
| 303 | |
| 304 | if (allRemoves(myChanges) && allRemoves(theirChanges)) { |
| 305 | // Special case for remove changes that are supersets of one another |
| 306 | if ( |
| 307 | /*istanbul ignore start*/ |
| 308 | (0, |
| 309 | /*istanbul ignore end*/ |
| 310 | |
| 311 | /*istanbul ignore start*/ |
| 312 | _array |
| 313 | /*istanbul ignore end*/ |
| 314 | . |
| 315 | /*istanbul ignore start*/ |
| 316 | arrayStartsWith) |
| 317 | /*istanbul ignore end*/ |
| 318 | (myChanges, theirChanges) && skipRemoveSuperset(their, myChanges, myChanges.length - theirChanges.length)) { |
| 319 | /*istanbul ignore start*/ |
| 320 | var _hunk$lines3; |
| 321 | |
| 322 | /*istanbul ignore end*/ |
| 323 | |
| 324 | /*istanbul ignore start*/ |
| 325 | (_hunk$lines3 = |
| 326 | /*istanbul ignore end*/ |
| 327 | hunk.lines).push. |
| 328 | /*istanbul ignore start*/ |
| 329 | apply |
| 330 | /*istanbul ignore end*/ |
| 331 | ( |
| 332 | /*istanbul ignore start*/ |
| 333 | _hunk$lines3 |
| 334 | /*istanbul ignore end*/ |
| 335 | , |
| 336 | /*istanbul ignore start*/ |
| 337 | _toConsumableArray( |
| 338 | /*istanbul ignore end*/ |
| 339 | myChanges)); |
| 340 | |
| 341 | return; |
| 342 | } else if ( |
| 343 | /*istanbul ignore start*/ |
| 344 | (0, |
| 345 | /*istanbul ignore end*/ |
| 346 | |
| 347 | /*istanbul ignore start*/ |
| 348 | _array |
| 349 | /*istanbul ignore end*/ |
| 350 | . |
| 351 | /*istanbul ignore start*/ |
| 352 | arrayStartsWith) |
| 353 | /*istanbul ignore end*/ |
| 354 | (theirChanges, myChanges) && skipRemoveSuperset(mine, theirChanges, theirChanges.length - myChanges.length)) { |
| 355 | /*istanbul ignore start*/ |
| 356 | var _hunk$lines4; |
| 357 | |
| 358 | /*istanbul ignore end*/ |
| 359 | |
| 360 | /*istanbul ignore start*/ |
| 361 | (_hunk$lines4 = |
| 362 | /*istanbul ignore end*/ |
| 363 | hunk.lines).push. |
| 364 | /*istanbul ignore start*/ |
| 365 | apply |
| 366 | /*istanbul ignore end*/ |
| 367 | ( |
| 368 | /*istanbul ignore start*/ |
| 369 | _hunk$lines4 |
| 370 | /*istanbul ignore end*/ |
| 371 | , |
| 372 | /*istanbul ignore start*/ |
| 373 | _toConsumableArray( |
| 374 | /*istanbul ignore end*/ |
| 375 | theirChanges)); |
| 376 | |
| 377 | return; |
| 378 | } |
| 379 | } else if ( |
| 380 | /*istanbul ignore start*/ |
| 381 | (0, |
| 382 | /*istanbul ignore end*/ |
| 383 | |
| 384 | /*istanbul ignore start*/ |
| 385 | _array |
| 386 | /*istanbul ignore end*/ |
| 387 | . |
| 388 | /*istanbul ignore start*/ |
| 389 | arrayEqual) |
| 390 | /*istanbul ignore end*/ |
| 391 | (myChanges, theirChanges)) { |
| 392 | /*istanbul ignore start*/ |
| 393 | var _hunk$lines5; |
| 394 | |
| 395 | /*istanbul ignore end*/ |
| 396 | |
| 397 | /*istanbul ignore start*/ |
| 398 | (_hunk$lines5 = |
| 399 | /*istanbul ignore end*/ |
| 400 | hunk.lines).push. |
| 401 | /*istanbul ignore start*/ |
| 402 | apply |
| 403 | /*istanbul ignore end*/ |
| 404 | ( |
| 405 | /*istanbul ignore start*/ |
| 406 | _hunk$lines5 |
| 407 | /*istanbul ignore end*/ |
| 408 | , |
| 409 | /*istanbul ignore start*/ |
| 410 | _toConsumableArray( |
| 411 | /*istanbul ignore end*/ |
| 412 | myChanges)); |
| 413 | |
| 414 | return; |
| 415 | } |
| 416 | |
| 417 | conflict(hunk, myChanges, theirChanges); |
| 418 | } |
| 419 | |
| 420 | function removal(hunk, mine, their, swap) { |
| 421 | var myChanges = collectChange(mine), |
| 422 | theirChanges = collectContext(their, myChanges); |
| 423 | |
| 424 | if (theirChanges.merged) { |
| 425 | /*istanbul ignore start*/ |
| 426 | var _hunk$lines6; |
| 427 | |
| 428 | /*istanbul ignore end*/ |
| 429 | |
| 430 | /*istanbul ignore start*/ |
| 431 | (_hunk$lines6 = |
| 432 | /*istanbul ignore end*/ |
| 433 | hunk.lines).push. |
| 434 | /*istanbul ignore start*/ |
| 435 | apply |
| 436 | /*istanbul ignore end*/ |
| 437 | ( |
| 438 | /*istanbul ignore start*/ |
| 439 | _hunk$lines6 |
| 440 | /*istanbul ignore end*/ |
| 441 | , |
| 442 | /*istanbul ignore start*/ |
| 443 | _toConsumableArray( |
| 444 | /*istanbul ignore end*/ |
| 445 | theirChanges.merged)); |
| 446 | } else { |
| 447 | conflict(hunk, swap ? theirChanges : myChanges, swap ? myChanges : theirChanges); |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | function conflict(hunk, mine, their) { |
| 452 | hunk.conflict = true; |
| 453 | hunk.lines.push({ |
| 454 | conflict: true, |
| 455 | mine: mine, |
| 456 | theirs: their |
| 457 | }); |
| 458 | } |
| 459 | |
| 460 | function insertLeading(hunk, insert, their) { |
| 461 | while (insert.offset < their.offset && insert.index < insert.lines.length) { |
| 462 | var line = insert.lines[insert.index++]; |
| 463 | hunk.lines.push(line); |
| 464 | insert.offset++; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | function insertTrailing(hunk, insert) { |
| 469 | while (insert.index < insert.lines.length) { |
| 470 | var line = insert.lines[insert.index++]; |
| 471 | hunk.lines.push(line); |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | function collectChange(state) { |
| 476 | var ret = [], |
| 477 | operation = state.lines[state.index][0]; |
| 478 | |
| 479 | while (state.index < state.lines.length) { |
| 480 | var line = state.lines[state.index]; // Group additions that are immediately after subtractions and treat them as one "atomic" modify change. |
| 481 | |
| 482 | if (operation === '-' && line[0] === '+') { |
| 483 | operation = '+'; |
| 484 | } |
| 485 | |
| 486 | if (operation === line[0]) { |
| 487 | ret.push(line); |
| 488 | state.index++; |
| 489 | } else { |
| 490 | break; |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | return ret; |
| 495 | } |
| 496 | |
| 497 | function collectContext(state, matchChanges) { |
| 498 | var changes = [], |
| 499 | merged = [], |
| 500 | matchIndex = 0, |
| 501 | contextChanges = false, |
| 502 | conflicted = false; |
| 503 | |
| 504 | while (matchIndex < matchChanges.length && state.index < state.lines.length) { |
| 505 | var change = state.lines[state.index], |
| 506 | match = matchChanges[matchIndex]; // Once we've hit our add, then we are done |
| 507 | |
| 508 | if (match[0] === '+') { |
| 509 | break; |
| 510 | } |
| 511 | |
| 512 | contextChanges = contextChanges || change[0] !== ' '; |
| 513 | merged.push(match); |
| 514 | matchIndex++; // Consume any additions in the other block as a conflict to attempt |
| 515 | // to pull in the remaining context after this |
| 516 | |
| 517 | if (change[0] === '+') { |
| 518 | conflicted = true; |
| 519 | |
| 520 | while (change[0] === '+') { |
| 521 | changes.push(change); |
| 522 | change = state.lines[++state.index]; |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | if (match.substr(1) === change.substr(1)) { |
| 527 | changes.push(change); |
| 528 | state.index++; |
| 529 | } else { |
| 530 | conflicted = true; |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | if ((matchChanges[matchIndex] || '')[0] === '+' && contextChanges) { |
| 535 | conflicted = true; |
| 536 | } |
| 537 | |
| 538 | if (conflicted) { |
| 539 | return changes; |
| 540 | } |
| 541 | |
| 542 | while (matchIndex < matchChanges.length) { |
| 543 | merged.push(matchChanges[matchIndex++]); |
| 544 | } |
| 545 | |
| 546 | return { |
| 547 | merged: merged, |
| 548 | changes: changes |
| 549 | }; |
| 550 | } |
| 551 | |
| 552 | function allRemoves(changes) { |
| 553 | return changes.reduce(function (prev, change) { |
| 554 | return prev && change[0] === '-'; |
| 555 | }, true); |
| 556 | } |
| 557 | |
| 558 | function skipRemoveSuperset(state, removeChanges, delta) { |
| 559 | for (var i = 0; i < delta; i++) { |
| 560 | var changeContent = removeChanges[removeChanges.length - delta + i].substr(1); |
| 561 | |
| 562 | if (state.lines[state.index + i] !== ' ' + changeContent) { |
| 563 | return false; |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | state.index += delta; |
| 568 | return true; |
| 569 | } |
| 570 | |
| 571 | function calcOldNewLineCount(lines) { |
| 572 | var oldLines = 0; |
| 573 | var newLines = 0; |
| 574 | lines.forEach(function (line) { |
| 575 | if (typeof line !== 'string') { |
| 576 | var myCount = calcOldNewLineCount(line.mine); |
| 577 | var theirCount = calcOldNewLineCount(line.theirs); |
| 578 | |
| 579 | if (oldLines !== undefined) { |
| 580 | if (myCount.oldLines === theirCount.oldLines) { |
| 581 | oldLines += myCount.oldLines; |
| 582 | } else { |
| 583 | oldLines = undefined; |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | if (newLines !== undefined) { |
| 588 | if (myCount.newLines === theirCount.newLines) { |
| 589 | newLines += myCount.newLines; |
| 590 | } else { |
| 591 | newLines = undefined; |
| 592 | } |
| 593 | } |
| 594 | } else { |
| 595 | if (newLines !== undefined && (line[0] === '+' || line[0] === ' ')) { |
| 596 | newLines++; |
| 597 | } |
| 598 | |
| 599 | if (oldLines !== undefined && (line[0] === '-' || line[0] === ' ')) { |
| 600 | oldLines++; |
| 601 | } |
| 602 | } |
| 603 | }); |
| 604 | return { |
| 605 | oldLines: oldLines, |
| 606 | newLines: newLines |
| 607 | }; |
| 608 | } |
| 609 | //# 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{structuredPatch} from './create';\nimport {parsePatch} from './parse';\n\nimport {arrayEqual, arrayStartsWith} from '../util/array';\n\nexport function calcLineCount(hunk) {\n  const {oldLines, newLines} = calcOldNewLineCount(hunk.lines);\n\n  if (oldLines !== undefined) {\n    hunk.oldLines = oldLines;\n  } else {\n    delete hunk.oldLines;\n  }\n\n  if (newLines !== undefined) {\n    hunk.newLines = newLines;\n  } else {\n    delete hunk.newLines;\n  }\n}\n\nexport function merge(mine, theirs, base) {\n  mine = loadPatch(mine, base);\n  theirs = loadPatch(theirs, base);\n\n  let ret = {};\n\n  // For index we just let it pass through as it doesn't have any necessary meaning.\n  // Leaving sanity checks on this to the API consumer that may know more about the\n  // meaning in their own context.\n  if (mine.index || theirs.index) {\n    ret.index = mine.index || theirs.index;\n  }\n\n  if (mine.newFileName || theirs.newFileName) {\n    if (!fileNameChanged(mine)) {\n      // No header or no change in ours, use theirs (and ours if theirs does not exist)\n      ret.oldFileName = theirs.oldFileName || mine.oldFileName;\n      ret.newFileName = theirs.newFileName || mine.newFileName;\n      ret.oldHeader = theirs.oldHeader || mine.oldHeader;\n      ret.newHeader = theirs.newHeader || mine.newHeader;\n    } else if (!fileNameChanged(theirs)) {\n      // No header or no change in theirs, use ours\n      ret.oldFileName = mine.oldFileName;\n      ret.newFileName = mine.newFileName;\n      ret.oldHeader = mine.oldHeader;\n      ret.newHeader = mine.newHeader;\n    } else {\n      // Both changed... figure it out\n      ret.oldFileName = selectField(ret, mine.oldFileName, theirs.oldFileName);\n      ret.newFileName = selectField(ret, mine.newFileName, theirs.newFileName);\n      ret.oldHeader = selectField(ret, mine.oldHeader, theirs.oldHeader);\n      ret.newHeader = selectField(ret, mine.newHeader, theirs.newHeader);\n    }\n  }\n\n  ret.hunks = [];\n\n  let mineIndex = 0,\n      theirsIndex = 0,\n      mineOffset = 0,\n      theirsOffset = 0;\n\n  while (mineIndex < mine.hunks.length || theirsIndex < theirs.hunks.length) {\n    let mineCurrent = mine.hunks[mineIndex] || {oldStart: Infinity},\n        theirsCurrent = theirs.hunks[theirsIndex] || {oldStart: Infinity};\n\n    if (hunkBefore(mineCurrent, theirsCurrent)) {\n      // This patch does not overlap with any of the others, yay.\n      ret.hunks.push(cloneHunk(mineCurrent, mineOffset));\n      mineIndex++;\n      theirsOffset += mineCurrent.newLines - mineCurrent.oldLines;\n    } else if (hunkBefore(theirsCurrent, mineCurrent)) {\n      // This patch does not overlap with any of the others, yay.\n      ret.hunks.push(cloneHunk(theirsCurrent, theirsOffset));\n      theirsIndex++;\n      mineOffset += theirsCurrent.newLines - theirsCurrent.oldLines;\n    } else {\n      // Overlap, merge as best we can\n      let mergedHunk = {\n        oldStart: Math.min(mineCurrent.oldStart, theirsCurrent.oldStart),\n        oldLines: 0,\n        newStart: Math.min(mineCurrent.newStart + mineOffset, theirsCurrent.oldStart + theirsOffset),\n        newLines: 0,\n        lines: []\n      };\n      mergeLines(mergedHunk, mineCurrent.oldStart, mineCurrent.lines, theirsCurrent.oldStart, theirsCurrent.lines);\n      theirsIndex++;\n      mineIndex++;\n\n      ret.hunks.push(mergedHunk);\n    }\n  }\n\n  return ret;\n}\n\nfunction loadPatch(param, base) {\n  if (typeof param === 'string') {\n    if ((/^@@/m).test(param) || ((/^Index:/m).test(param))) {\n      return parsePatch(param)[0];\n    }\n\n    if (!base) {\n      throw new Error('Must provide a base reference or pass in a patch');\n    }\n    return structuredPatch(undefined, undefined, base, param);\n  }\n\n  return param;\n}\n\nfunction fileNameChanged(patch) {\n  return patch.newFileName && patch.newFileName !== patch.oldFileName;\n}\n\nfunction selectField(index, mine, theirs) {\n  if (mine === theirs) {\n    return mine;\n  } else {\n    index.conflict = true;\n    return {mine, theirs};\n  }\n}\n\nfunction hunkBefore(test, check) {\n  return test.oldStart < check.oldStart\n    && (test.oldStart + test.oldLines) < check.oldStart;\n}\n\nfunction cloneHunk(hunk, offset) {\n  return {\n    oldStart: hunk.oldStart, oldLines: hunk.oldLines,\n    newStart: hunk.newStart + offset, newLines: hunk.newLines,\n    lines: hunk.lines\n  };\n}\n\nfunction mergeLines(hunk, mineOffset, mineLines, theirOffset, theirLines) {\n  // This will generally result in a conflicted hunk, but there are cases where the context\n  // is the only overlap where we can successfully merge the content here.\n  let mine = {offset: mineOffset, lines: mineLines, index: 0},\n      their = {offset: theirOffset, lines: theirLines, index: 0};\n\n  // Handle any leading content\n  insertLeading(hunk, mine, their);\n  insertLeading(hunk, their, mine);\n\n  // Now in the overlap content. Scan through and select the best changes from each.\n  while (mine.index < mine.lines.length && their.index < their.lines.length) {\n    let mineCurrent = mine.lines[mine.index],\n        theirCurrent = their.lines[their.index];\n\n    if ((mineCurrent[0] === '-' || mineCurrent[0] === '+')\n        && (theirCurrent[0] === '-' || theirCurrent[0] === '+')) {\n      // Both modified ...\n      mutualChange(hunk, mine, their);\n    } else if (mineCurrent[0] === '+' && theirCurrent[0] === ' ') {\n      // Mine inserted\n      hunk.lines.push(... collectChange(mine));\n    } else if (theirCurrent[0] === '+' && mineCurrent[0] === ' ') {\n      // Theirs inserted\n      hunk.lines.push(... collectChange(their));\n    } else if (mineCurrent[0] === '-' && theirCurrent[0] === ' ') {\n      // Mine removed or edited\n      removal(hunk, mine, their);\n    } else if (theirCurrent[0] === '-' && mineCurrent[0] === ' ') {\n      // Their removed or edited\n      removal(hunk, their, mine, true);\n    } else if (mineCurrent === theirCurrent) {\n      // Context identity\n      hunk.lines.push(mineCurrent);\n      mine.index++;\n      their.index++;\n    } else {\n      // Context mismatch\n      conflict(hunk, collectChange(mine), collectChange(their));\n    }\n  }\n\n  // Now push anything that may be remaining\n  insertTrailing(hunk, mine);\n  insertTrailing(hunk, their);\n\n  calcLineCount(hunk);\n}\n\nfunction mutualChange(hunk, mine, their) {\n  let myChanges = collectChange(mine),\n      theirChanges = collectChange(their);\n\n  if (allRemoves(myChanges) && allRemoves(theirChanges)) {\n    // Special case for remove changes that are supersets of one another\n    if (arrayStartsWith(myChanges, theirChanges)\n        && skipRemoveSuperset(their, myChanges, myChanges.length - theirChanges.length)) {\n      hunk.lines.push(... myChanges);\n      return;\n    } else if (arrayStartsWith(theirChanges, myChanges)\n        && skipRemoveSuperset(mine, theirChanges, theirChanges.length - myChanges.length)) {\n      hunk.lines.push(... theirChanges);\n      return;\n    }\n  } else if (arrayEqual(myChanges, theirChanges)) {\n    hunk.lines.push(... myChanges);\n    return;\n  }\n\n  conflict(hunk, myChanges, theirChanges);\n}\n\nfunction removal(hunk, mine, their, swap) {\n  let myChanges = collectChange(mine),\n      theirChanges = collectContext(their, myChanges);\n  if (theirChanges.merged) {\n    hunk.lines.push(... theirChanges.merged);\n  } else {\n    conflict(hunk, swap ? theirChanges : myChanges, swap ? myChanges : theirChanges);\n  }\n}\n\nfunction conflict(hunk, mine, their) {\n  hunk.conflict = true;\n  hunk.lines.push({\n    conflict: true,\n    mine: mine,\n    theirs: their\n  });\n}\n\nfunction insertLeading(hunk, insert, their) {\n  while (insert.offset < their.offset && insert.index < insert.lines.length) {\n    let line = insert.lines[insert.index++];\n    hunk.lines.push(line);\n    insert.offset++;\n  }\n}\nfunction insertTrailing(hunk, insert) {\n  while (insert.index < insert.lines.length) {\n    let line = insert.lines[insert.index++];\n    hunk.lines.push(line);\n  }\n}\n\nfunction collectChange(state) {\n  let ret = [],\n      operation = state.lines[state.index][0];\n  while (state.index < state.lines.length) {\n    let line = state.lines[state.index];\n\n    // Group additions that are immediately after subtractions and treat them as one \"atomic\" modify change.\n    if (operation === '-' && line[0] === '+') {\n      operation = '+';\n    }\n\n    if (operation === line[0]) {\n      ret.push(line);\n      state.index++;\n    } else {\n      break;\n    }\n  }\n\n  return ret;\n}\nfunction collectContext(state, matchChanges) {\n  let changes = [],\n      merged = [],\n      matchIndex = 0,\n      contextChanges = false,\n      conflicted = false;\n  while (matchIndex < matchChanges.length\n        && state.index < state.lines.length) {\n    let change = state.lines[state.index],\n        match = matchChanges[matchIndex];\n\n    // Once we've hit our add, then we are done\n    if (match[0] === '+') {\n      break;\n    }\n\n    contextChanges = contextChanges || change[0] !== ' ';\n\n    merged.push(match);\n    matchIndex++;\n\n    // Consume any additions in the other block as a conflict to attempt\n    // to pull in the remaining context after this\n    if (change[0] === '+') {\n      conflicted = true;\n\n      while (change[0] === '+') {\n        changes.push(change);\n        change = state.lines[++state.index];\n      }\n    }\n\n    if (match.substr(1) === change.substr(1)) {\n      changes.push(change);\n      state.index++;\n    } else {\n      conflicted = true;\n    }\n  }\n\n  if ((matchChanges[matchIndex] || '')[0] === '+'\n      && contextChanges) {\n    conflicted = true;\n  }\n\n  if (conflicted) {\n    return changes;\n  }\n\n  while (matchIndex < matchChanges.length) {\n    merged.push(matchChanges[matchIndex++]);\n  }\n\n  return {\n    merged,\n    changes\n  };\n}\n\nfunction allRemoves(changes) {\n  return changes.reduce(function(prev, change) {\n    return prev && change[0] === '-';\n  }, true);\n}\nfunction skipRemoveSuperset(state, removeChanges, delta) {\n  for (let i = 0; i < delta; i++) {\n    let changeContent = removeChanges[removeChanges.length - delta + i].substr(1);\n    if (state.lines[state.index + i] !== ' ' + changeContent) {\n      return false;\n    }\n  }\n\n  state.index += delta;\n  return true;\n}\n\nfunction calcOldNewLineCount(lines) {\n  let oldLines = 0;\n  let newLines = 0;\n\n  lines.forEach(function(line) {\n    if (typeof line !== 'string') {\n      let myCount = calcOldNewLineCount(line.mine);\n      let theirCount = calcOldNewLineCount(line.theirs);\n\n      if (oldLines !== undefined) {\n        if (myCount.oldLines === theirCount.oldLines) {\n          oldLines += myCount.oldLines;\n        } else {\n          oldLines = undefined;\n        }\n      }\n\n      if (newLines !== undefined) {\n        if (myCount.newLines === theirCount.newLines) {\n          newLines += myCount.newLines;\n        } else {\n          newLines = undefined;\n        }\n      }\n    } else {\n      if (newLines !== undefined && (line[0] === '+' || line[0] === ' ')) {\n        newLines++;\n      }\n      if (oldLines !== undefined && (line[0] === '-' || line[0] === ' ')) {\n        oldLines++;\n      }\n    }\n  });\n\n  return {oldLines, newLines};\n}\n"]} |