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

// Generated by CoffeeScript 2.0.0-alpha1
(function() {
  var LineMap, SourceMap;

  LineMap = class LineMap {
    constructor(line1) {
      this.line = line1;
      this.columns = [];
    }

    add(column, [sourceLine, sourceColumn], options = {}) {
      if (this.columns[column] && options.noReplace) {
        return;
      }
      return this.columns[column] = {
        line: this.line,
        column,
        sourceLine,
        sourceColumn
      };
    }

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

  };

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

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

      add(sourceLocation, generatedLocation, options = {}) {
        var base, column, line, lineMap;
        [line, column] = generatedLocation;
        lineMap = ((base = this.lines)[line] || (base[line] = new LineMap(line)));
        return lineMap.add(column, sourceLocation, options);
      }

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

      generate(options = {}, code = null) {
        var buffer, i, j, lastColumn, lastSourceColumn, lastSourceLine, len, len1, lineMap, lineNumber, mapping, needComma, ref, ref1, v3, writingline;
        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.inlineMap) {
          v3.sourcesContent = [code];
        }
        return v3;
      }

      encodeVlq(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;
      }

      encodeBase64(value) {
        return BASE64_CHARS[value] || (function() {
          throw new Error(`Cannot Base64 encode value: ${value}`);
        })();
      }

    };

    VLQ_SHIFT = 5;

    VLQ_CONTINUATION_BIT = 1 << VLQ_SHIFT;

    VLQ_VALUE_MASK = VLQ_CONTINUATION_BIT - 1;

    BASE64_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    return SourceMap;

  })();

  module.exports = SourceMap;

}).call(this);