Function structuredPatch

src/diff.js:924–1054

(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options)

  }

  function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
    if (!options) {
      options = {};
    }

    if (typeof options.context === 'undefined') {
      options.context = 4;
    }

    var diff = diffLines(oldStr, newStr, options);

    if (!diff) {
      return;
    }

    diff.push({
      value: '',
      lines: []
    }); // Append an empty value to make cleanup easier

    function contextLines(lines) {
      return lines.map(function (entry) {
        return ' ' + entry;
      });
    }

    var hunks = [];
    var oldRangeStart = 0,
        newRangeStart = 0,
        curRange = [],
        oldLine = 1,
        newLine = 1;

    var _loop = function _loop(i) {
      var current = diff[i],
          lines = current.lines || current.value.replace(/\n$/, '').split('\n');
      current.lines = lines;

      if (current.added || current.removed) {
        var _curRange;

        // If we have previous context, start with that
        if (!oldRangeStart) {
          var prev = diff[i - 1];
          oldRangeStart = oldLine;
          newRangeStart = newLine;

          if (prev) {
            curRange = options.context > 0 ? contextLines(prev.lines.slice(-options.context)) : [];
            oldRangeStart -= curRange.length;
            newRangeStart -= curRange.length;
          }
        } // Output our changes


        (_curRange = curRange).push.apply(_curRange, _toConsumableArray(lines.map(function (entry) {
          return (current.added ? '+' : '-') + entry;
        }))); // Track the updated file position