projen
Version:
CDK for software projects
170 lines • 23.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.unifiedDiff = unifiedDiff;
const chalk_1 = require("chalk");
/**
* Compute a unified diff between two strings with context lines, hunk headers,
* and optional colorized output with character-level inline highlighting.
*
* @param oldContent the previous content.
* @param newContent the new content.
* @param colorize whether to colorize the output.
* @param contextSize number of unchanged context lines around each change.
* @returns the diff as an array of lines, or `undefined` if there are no changes.
*/
function unifiedDiff(oldContent, newContent, colorize, contextSize) {
const oldLines = oldContent.split("\n");
const newLines = newContent.split("\n");
const edits = computeEdits(oldLines, newLines);
// Find indices of changed edits
const changeIndices = [];
for (let i = 0; i < edits.length; i++) {
if (edits[i].type !== "equal") {
changeIndices.push(i);
}
}
if (changeIndices.length === 0) {
return undefined;
}
// Group changes into hunks with context, merging overlapping ones
const hunks = [];
for (const ci of changeIndices) {
const start = Math.max(0, ci - contextSize);
const end = Math.min(edits.length - 1, ci + contextSize);
if (hunks.length > 0 && start <= hunks[hunks.length - 1].end + 1) {
hunks[hunks.length - 1].end = end;
}
else {
hunks.push({ start, end });
}
}
// Format hunks
const output = [];
for (const hunk of hunks) {
// Compute line numbers for the header
let oldStart = 1;
let newStart = 1;
for (let i = 0; i < hunk.start; i++) {
const e = edits[i];
if (e.type === "equal" || e.type === "delete" || e.type === "replace") {
oldStart++;
}
if (e.type === "equal" || e.type === "insert" || e.type === "replace") {
newStart++;
}
}
let oldCount = 0;
let newCount = 0;
for (let i = hunk.start; i <= hunk.end; i++) {
const e = edits[i];
if (e.type === "equal" || e.type === "delete" || e.type === "replace") {
oldCount++;
}
if (e.type === "equal" || e.type === "insert" || e.type === "replace") {
newCount++;
}
}
const header = `@@ -${oldStart},${oldCount} +${newStart},${newCount} @@`;
output.push(colorize ? (0, chalk_1.cyan)(header) : header);
for (let i = hunk.start; i <= hunk.end; i++) {
const e = edits[i];
switch (e.type) {
case "equal":
output.push(` ${oldLines[e.oldIdx]}`);
break;
case "delete":
output.push(colorize
? `${chalk_1.bold.red("-")} ${(0, chalk_1.red)(oldLines[e.oldIdx])}`
: `- ${oldLines[e.oldIdx]}`);
break;
case "insert":
output.push(colorize
? `${chalk_1.bold.green("+")} ${(0, chalk_1.green)(newLines[e.newIdx])}`
: `+ ${newLines[e.newIdx]}`);
break;
case "replace":
output.push(...inlineDiff(oldLines[e.oldIdx], newLines[e.newIdx], colorize));
break;
}
}
}
return output;
}
/**
* Compute edit operations between two arrays of lines using LCS.
*/
function computeEdits(oldLines, newLines) {
const oldLen = oldLines.length;
const newLen = newLines.length;
// Build LCS table
const lcs = Array.from({ length: oldLen + 1 }, () => new Array(newLen + 1).fill(0));
for (let i = oldLen - 1; i >= 0; i--) {
for (let j = newLen - 1; j >= 0; j--) {
if (oldLines[i] === newLines[j]) {
lcs[i][j] = lcs[i + 1][j + 1] + 1;
}
else {
lcs[i][j] = Math.max(lcs[i + 1][j], lcs[i][j + 1]);
}
}
}
// Walk the LCS table to produce edit operations
const edits = [];
let i = 0;
let j = 0;
while (i < oldLen || j < newLen) {
if (i < oldLen && j < newLen && oldLines[i] === newLines[j]) {
edits.push({ type: "equal", oldIdx: i, newIdx: j });
i++;
j++;
}
else if (i < oldLen && j < newLen && lcs[i + 1][j] === lcs[i][j + 1]) {
// Both sides advance equally — treat as a replacement
edits.push({ type: "replace", oldIdx: i, newIdx: j });
i++;
j++;
}
else if (j < newLen && (i >= oldLen || lcs[i][j + 1] >= lcs[i + 1][j])) {
edits.push({ type: "insert", newIdx: j });
j++;
}
else {
edits.push({ type: "delete", oldIdx: i });
i++;
}
}
return edits;
}
/**
* Produces a remove/add line pair with character-level highlighting
* of the parts that changed.
*/
function inlineDiff(oldLine, newLine, colorize) {
// Find common prefix and suffix
let prefix = 0;
while (prefix < oldLine.length &&
prefix < newLine.length &&
oldLine[prefix] === newLine[prefix]) {
prefix++;
}
let oldSuffix = oldLine.length;
let newSuffix = newLine.length;
while (oldSuffix > prefix &&
newSuffix > prefix &&
oldLine[oldSuffix - 1] === newLine[newSuffix - 1]) {
oldSuffix--;
newSuffix--;
}
if (colorize) {
const before = oldLine.substring(0, prefix);
const after = oldLine.substring(oldSuffix);
const oldChanged = oldLine.substring(prefix, oldSuffix);
const newChanged = newLine.substring(prefix, newSuffix);
return [
`${chalk_1.bold.red("-")} ${(0, chalk_1.red)(before)}${chalk_1.red.bold.underline(oldChanged)}${(0, chalk_1.red)(after)}`,
`${chalk_1.bold.green("+")} ${(0, chalk_1.green)(before)}${chalk_1.green.bold.underline(newChanged)}${(0, chalk_1.green)(after)}`,
];
}
return [`- ${oldLine}`, `+ ${newLine}`];
}
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{ bold, cyan, green, red } from \"chalk\";\n\n/**\n * Compute a unified diff between two strings with context lines, hunk headers,\n * and optional colorized output with character-level inline highlighting.\n *\n * @param oldContent the previous content.\n * @param newContent the new content.\n * @param colorize whether to colorize the output.\n * @param contextSize number of unchanged context lines around each change.\n * @returns the diff as an array of lines, or `undefined` if there are no changes.\n */\nexport function unifiedDiff(\n  oldContent: string,\n  newContent: string,\n  colorize: boolean,\n  contextSize: number,\n): string[] | undefined {\n  const oldLines = oldContent.split(\"\\n\");\n  const newLines = newContent.split(\"\\n\");\n  const edits = computeEdits(oldLines, newLines);\n\n  // Find indices of changed edits\n  const changeIndices: number[] = [];\n  for (let i = 0; i < edits.length; i++) {\n    if (edits[i].type !== \"equal\") {\n      changeIndices.push(i);\n    }\n  }\n  if (changeIndices.length === 0) {\n    return undefined;\n  }\n\n  // Group changes into hunks with context, merging overlapping ones\n  const hunks: Array<{ start: number; end: number }> = [];\n  for (const ci of changeIndices) {\n    const start = Math.max(0, ci - contextSize);\n    const end = Math.min(edits.length - 1, ci + contextSize);\n    if (hunks.length > 0 && start <= hunks[hunks.length - 1].end + 1) {\n      hunks[hunks.length - 1].end = end;\n    } else {\n      hunks.push({ start, end });\n    }\n  }\n\n  // Format hunks\n  const output: string[] = [];\n  for (const hunk of hunks) {\n    // Compute line numbers for the header\n    let oldStart = 1;\n    let newStart = 1;\n    for (let i = 0; i < hunk.start; i++) {\n      const e = edits[i];\n      if (e.type === \"equal\" || e.type === \"delete\" || e.type === \"replace\") {\n        oldStart++;\n      }\n      if (e.type === \"equal\" || e.type === \"insert\" || e.type === \"replace\") {\n        newStart++;\n      }\n    }\n\n    let oldCount = 0;\n    let newCount = 0;\n    for (let i = hunk.start; i <= hunk.end; i++) {\n      const e = edits[i];\n      if (e.type === \"equal\" || e.type === \"delete\" || e.type === \"replace\") {\n        oldCount++;\n      }\n      if (e.type === \"equal\" || e.type === \"insert\" || e.type === \"replace\") {\n        newCount++;\n      }\n    }\n\n    const header = `@@ -${oldStart},${oldCount} +${newStart},${newCount} @@`;\n    output.push(colorize ? cyan(header) : header);\n\n    for (let i = hunk.start; i <= hunk.end; i++) {\n      const e = edits[i];\n      switch (e.type) {\n        case \"equal\":\n          output.push(`  ${oldLines[e.oldIdx]}`);\n          break;\n        case \"delete\":\n          output.push(\n            colorize\n              ? `${bold.red(\"-\")} ${red(oldLines[e.oldIdx])}`\n              : `- ${oldLines[e.oldIdx]}`,\n          );\n          break;\n        case \"insert\":\n          output.push(\n            colorize\n              ? `${bold.green(\"+\")} ${green(newLines[e.newIdx])}`\n              : `+ ${newLines[e.newIdx]}`,\n          );\n          break;\n        case \"replace\":\n          output.push(\n            ...inlineDiff(oldLines[e.oldIdx], newLines[e.newIdx], colorize),\n          );\n          break;\n      }\n    }\n  }\n\n  return output;\n}\n\ntype EditOp =\n  | { type: \"equal\"; oldIdx: number; newIdx: number }\n  | { type: \"delete\"; oldIdx: number }\n  | { type: \"insert\"; newIdx: number }\n  | { type: \"replace\"; oldIdx: number; newIdx: number };\n\n/**\n * Compute edit operations between two arrays of lines using LCS.\n */\nfunction computeEdits(oldLines: string[], newLines: string[]): EditOp[] {\n  const oldLen = oldLines.length;\n  const newLen = newLines.length;\n\n  // Build LCS table\n  const lcs: number[][] = Array.from({ length: oldLen + 1 }, () =>\n    new Array(newLen + 1).fill(0),\n  );\n  for (let i = oldLen - 1; i >= 0; i--) {\n    for (let j = newLen - 1; j >= 0; j--) {\n      if (oldLines[i] === newLines[j]) {\n        lcs[i][j] = lcs[i + 1][j + 1] + 1;\n      } else {\n        lcs[i][j] = Math.max(lcs[i + 1][j], lcs[i][j + 1]);\n      }\n    }\n  }\n\n  // Walk the LCS table to produce edit operations\n  const edits: EditOp[] = [];\n  let i = 0;\n  let j = 0;\n  while (i < oldLen || j < newLen) {\n    if (i < oldLen && j < newLen && oldLines[i] === newLines[j]) {\n      edits.push({ type: \"equal\", oldIdx: i, newIdx: j });\n      i++;\n      j++;\n    } else if (i < oldLen && j < newLen && lcs[i + 1][j] === lcs[i][j + 1]) {\n      // Both sides advance equally — treat as a replacement\n      edits.push({ type: \"replace\", oldIdx: i, newIdx: j });\n      i++;\n      j++;\n    } else if (j < newLen && (i >= oldLen || lcs[i][j + 1] >= lcs[i + 1][j])) {\n      edits.push({ type: \"insert\", newIdx: j });\n      j++;\n    } else {\n      edits.push({ type: \"delete\", oldIdx: i });\n      i++;\n    }\n  }\n\n  return edits;\n}\n\n/**\n * Produces a remove/add line pair with character-level highlighting\n * of the parts that changed.\n */\nfunction inlineDiff(\n  oldLine: string,\n  newLine: string,\n  colorize: boolean,\n): string[] {\n  // Find common prefix and suffix\n  let prefix = 0;\n  while (\n    prefix < oldLine.length &&\n    prefix < newLine.length &&\n    oldLine[prefix] === newLine[prefix]\n  ) {\n    prefix++;\n  }\n  let oldSuffix = oldLine.length;\n  let newSuffix = newLine.length;\n  while (\n    oldSuffix > prefix &&\n    newSuffix > prefix &&\n    oldLine[oldSuffix - 1] === newLine[newSuffix - 1]\n  ) {\n    oldSuffix--;\n    newSuffix--;\n  }\n\n  if (colorize) {\n    const before = oldLine.substring(0, prefix);\n    const after = oldLine.substring(oldSuffix);\n    const oldChanged = oldLine.substring(prefix, oldSuffix);\n    const newChanged = newLine.substring(prefix, newSuffix);\n    return [\n      `${bold.red(\"-\")} ${red(before)}${red.bold.underline(oldChanged)}${red(after)}`,\n      `${bold.green(\"+\")} ${green(before)}${green.bold.underline(newChanged)}${green(after)}`,\n    ];\n  }\n\n  return [`- ${oldLine}`, `+ ${newLine}`];\n}\n"]}