jashkenas--coffeescript/lib/coffee-script/sourcemap.js

// Generated by CoffeeScript 1.7.1
(function() {
  var LineMap, SourceMap;

  LineMap = (function() {
    function LineMap(line) {
      this.line = line;
      this.columns = [];
    }

    LineMap.prototype.add = function(column, _arg, options) {
      var sourceColumn, sourceLine;
      sourceLine = _arg[0], sourceColumn = _arg[1];
      if (options == null) {
        options = {};
      }
      if (this.columns[column] && options.noReplace) {
        return;
      }
      return this.columns[column] = {
        line: this.line,
        column: column,
        sourceLine: sourceLine,
        sourceColumn: sourceColumn
      };
    };

    LineMap.prototype.sourceLocation = function(column) {
      var mapping;
      while (!((mapping = this.columns[column]) || (column <= 0))) {
        column--;
      }
      return mapping && [mapping.sourceLine, mapping.sourceColumn];
    };

    return LineMap;

  })();

  SourceMap = (function() {
    var BASE64_CHARS, VLQ_CONTINUATION_BIT, VLQ_SHIFT, VLQ_VALUE_MASK;

    function SourceMap() {
      this.lines = [];
    }

    SourceMap.prototype.add = function(sourceLocation, generatedLocation, options) {
      var column, line, lineMap, _base;
      if (options == null) {
        options = {};
      }
      line = generatedLocation[0], column = generatedLocation[1];
      lineMap = ((_base = this.lines)[line] || (_base[line] = new LineMap(line)));
      return lineMap.add(column, sourceLocation, options);
    };

    SourceMap.prototype.sourceLocation = function(_arg) {
      var column, line, lineMap;
      line = _arg[0], column = _arg[1];
      while (!((lineMap = this.lines[line]) || (line <= 0))) {
        line--;
      }
      return lineMap && lineMap.sourceLocation(column);
    };

    SourceMap.prototype.generate = function(options, code) {
      var buffer, lastColumn, lastSourceColumn, lastSourceLine, lineMap, lineNumber, mapping, needComma, v3, writingline, _i, _j, _len, _len1, _ref, _ref1;
      if (options == null) {
        options = {};
      }
      if (code == null) {
        code = null;
      }
      writingline = 0;
      lastColumn = 0;
      lastSourceLine = 0;
      lastSourceColumn = 0;
      needComma = false;
      buffer = "";
      _ref = this.lines;
      for (lineNumber = _i = 0, _len = _ref.length; _i < _len; lineNumber = ++_i) {
        lineMap = _ref[lineNumber];
        if (lineMap) {
          _ref1 = lineMap.columns;
          for (_j = 0, _len1 = _ref1.length; _j < _len1; _j++) {
            mapping = _ref1[_j];
            if (!(mapping)) {
              continue;
            }
            while (writingline < mapping.line) {
              lastColumn = 0;
              needComma = false;
              buffer += ";";
              writingline++;
            }
            if (needComma) {
              buffer += ",";
              needComma = false;
            }
            buffer += this.encodeVlq(mapping.column - lastColumn);
            lastColumn = mapping.column;
            buffer += this.encodeVlq(0);
            buffer += this.encodeVlq(mapping.sourceLine - lastSourceLine);
            lastSourceLine = mapping.sourceLine;
            buffer += this.encodeVlq(mapping.sourceColumn - lastSourceColumn);
            lastSourceColumn = mapping.sourceColumn;
            needComma = true;
          }
        }
      }
      v3 = {
        version: 3,
        file: options.generatedFile || '',
        sourceRoot: options.sourceRoot || '',
        sources: options.sourceFiles || [''],
        names: [],
        mappings: buffer
      };
      if (options.inline) {
        v3.sourcesContent = [code];
      }
      return JSON.stringify(v3, null, 2);
    };

    VLQ_SHIFT = 5;

    VLQ_CONTINUATION_BIT = 1 << VLQ_SHIFT;

    VLQ_VALUE_MASK = VLQ_CONTINUATION_BIT - 1;

    SourceMap.prototype.encodeVlq = function(value) {
      var answer, nextChunk, signBit, valueToEncode;
      answer = '';
      signBit = value < 0 ? 1 : 0;
      valueToEncode = (Math.abs(value) << 1) + signBit;
      while (valueToEncode || !answer) {
        nextChunk = valueToEncode & VLQ_VALUE_MASK;
        valueToEncode = valueToEncode >> VLQ_SHIFT;
        if (valueToEncode) {
          nextChunk |= VLQ_CONTINUATION_BIT;
        }
        answer += this.encodeBase64(nextChunk);
      }
      return answer;
    };

    BASE64_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    SourceMap.prototype.encodeBase64 = function(value) {
      return BASE64_CHARS[value] || (function() {
        throw new Error("Cannot Base64 encode value: " + value);
      })();
    };

    return SourceMap;

  })();

  module.exports = SourceMap;

}).call(this);