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qwen/nodejs/node_modules/jest-diff/build/getAlignedDiffs.js

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+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+var _cleanupSemantic = require('./cleanupSemantic');
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// Given change op and array of diffs, return concatenated string:
+// * include common strings
+// * include change strings which have argument op with changeColor
+// * exclude change strings which have opposite op
+const concatenateRelevantDiffs = (op, diffs, changeColor) =>
+  diffs.reduce(
+    (reduced, diff) =>
+      reduced +
+      (diff[0] === _cleanupSemantic.DIFF_EQUAL
+        ? diff[1]
+        : diff[0] === op && diff[1].length !== 0 // empty if change is newline
+        ? changeColor(diff[1])
+        : ''),
+    ''
+  );
+
+// Encapsulate change lines until either a common newline or the end.
+class ChangeBuffer {
+  op;
+  line; // incomplete line
+  lines; // complete lines
+  changeColor;
+  constructor(op, changeColor) {
+    this.op = op;
+    this.line = [];
+    this.lines = [];
+    this.changeColor = changeColor;
+  }
+  pushSubstring(substring) {
+    this.pushDiff(new _cleanupSemantic.Diff(this.op, substring));
+  }
+  pushLine() {
+    // Assume call only if line has at least one diff,
+    // therefore an empty line must have a diff which has an empty string.
+
+    // If line has multiple diffs, then assume it has a common diff,
+    // therefore change diffs have change color;
+    // otherwise then it has line color only.
+    this.lines.push(
+      this.line.length !== 1
+        ? new _cleanupSemantic.Diff(
+            this.op,
+            concatenateRelevantDiffs(this.op, this.line, this.changeColor)
+          )
+        : this.line[0][0] === this.op
+        ? this.line[0] // can use instance
+        : new _cleanupSemantic.Diff(this.op, this.line[0][1]) // was common diff
+    );
+
+    this.line.length = 0;
+  }
+  isLineEmpty() {
+    return this.line.length === 0;
+  }
+
+  // Minor input to buffer.
+  pushDiff(diff) {
+    this.line.push(diff);
+  }
+
+  // Main input to buffer.
+  align(diff) {
+    const string = diff[1];
+    if (string.includes('\n')) {
+      const substrings = string.split('\n');
+      const iLast = substrings.length - 1;
+      substrings.forEach((substring, i) => {
+        if (i < iLast) {
+          // The first substring completes the current change line.
+          // A middle substring is a change line.
+          this.pushSubstring(substring);
+          this.pushLine();
+        } else if (substring.length !== 0) {
+          // The last substring starts a change line, if it is not empty.
+          // Important: This non-empty condition also automatically omits
+          // the newline appended to the end of expected and received strings.
+          this.pushSubstring(substring);
+        }
+      });
+    } else {
+      // Append non-multiline string to current change line.
+      this.pushDiff(diff);
+    }
+  }
+
+  // Output from buffer.
+  moveLinesTo(lines) {
+    if (!this.isLineEmpty()) {
+      this.pushLine();
+    }
+    lines.push(...this.lines);
+    this.lines.length = 0;
+  }
+}
+
+// Encapsulate common and change lines.
+class CommonBuffer {
+  deleteBuffer;
+  insertBuffer;
+  lines;
+  constructor(deleteBuffer, insertBuffer) {
+    this.deleteBuffer = deleteBuffer;
+    this.insertBuffer = insertBuffer;
+    this.lines = [];
+  }
+  pushDiffCommonLine(diff) {
+    this.lines.push(diff);
+  }
+  pushDiffChangeLines(diff) {
+    const isDiffEmpty = diff[1].length === 0;
+
+    // An empty diff string is redundant, unless a change line is empty.
+    if (!isDiffEmpty || this.deleteBuffer.isLineEmpty()) {
+      this.deleteBuffer.pushDiff(diff);
+    }
+    if (!isDiffEmpty || this.insertBuffer.isLineEmpty()) {
+      this.insertBuffer.pushDiff(diff);
+    }
+  }
+  flushChangeLines() {
+    this.deleteBuffer.moveLinesTo(this.lines);
+    this.insertBuffer.moveLinesTo(this.lines);
+  }
+
+  // Input to buffer.
+  align(diff) {
+    const op = diff[0];
+    const string = diff[1];
+    if (string.includes('\n')) {
+      const substrings = string.split('\n');
+      const iLast = substrings.length - 1;
+      substrings.forEach((substring, i) => {
+        if (i === 0) {
+          const subdiff = new _cleanupSemantic.Diff(op, substring);
+          if (
+            this.deleteBuffer.isLineEmpty() &&
+            this.insertBuffer.isLineEmpty()
+          ) {
+            // If both current change lines are empty,
+            // then the first substring is a common line.
+            this.flushChangeLines();
+            this.pushDiffCommonLine(subdiff);
+          } else {
+            // If either current change line is non-empty,
+            // then the first substring completes the change lines.
+            this.pushDiffChangeLines(subdiff);
+            this.flushChangeLines();
+          }
+        } else if (i < iLast) {
+          // A middle substring is a common line.
+          this.pushDiffCommonLine(new _cleanupSemantic.Diff(op, substring));
+        } else if (substring.length !== 0) {
+          // The last substring starts a change line, if it is not empty.
+          // Important: This non-empty condition also automatically omits
+          // the newline appended to the end of expected and received strings.
+          this.pushDiffChangeLines(new _cleanupSemantic.Diff(op, substring));
+        }
+      });
+    } else {
+      // Append non-multiline string to current change lines.
+      // Important: It cannot be at the end following empty change lines,
+      // because newline appended to the end of expected and received strings.
+      this.pushDiffChangeLines(diff);
+    }
+  }
+
+  // Output from buffer.
+  getLines() {
+    this.flushChangeLines();
+    return this.lines;
+  }
+}
+
+// Given diffs from expected and received strings,
+// return new array of diffs split or joined into lines.
+//
+// To correctly align a change line at the end, the algorithm:
+// * assumes that a newline was appended to the strings
+// * omits the last newline from the output array
+//
+// Assume the function is not called:
+// * if either expected or received is empty string
+// * if neither expected nor received is multiline string
+const getAlignedDiffs = (diffs, changeColor) => {
+  const deleteBuffer = new ChangeBuffer(
+    _cleanupSemantic.DIFF_DELETE,
+    changeColor
+  );
+  const insertBuffer = new ChangeBuffer(
+    _cleanupSemantic.DIFF_INSERT,
+    changeColor
+  );
+  const commonBuffer = new CommonBuffer(deleteBuffer, insertBuffer);
+  diffs.forEach(diff => {
+    switch (diff[0]) {
+      case _cleanupSemantic.DIFF_DELETE:
+        deleteBuffer.align(diff);
+        break;
+      case _cleanupSemantic.DIFF_INSERT:
+        insertBuffer.align(diff);
+        break;
+      default:
+        commonBuffer.align(diff);
+    }
+  });
+  return commonBuffer.getLines();
+};
+var _default = getAlignedDiffs;
+exports.default = _default;