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

// Generated by CoffeeScript 2.1.0
(function() {
  // CoffeeScript can be used both on the server, as a command-line compiler based
  // on Node.js/V8, or to run CoffeeScript directly in the browser. This module
  // contains the main entry functions for tokenizing, parsing, and compiling
  // source CoffeeScript into JavaScript.
  var FILE_EXTENSIONS, Lexer, SourceMap, base64encode, checkShebangLine, compile, formatSourcePosition, getSourceMap, helpers, lexer, packageJson, parser, sourceMaps, sources, withPrettyErrors,
    indexOf = [].indexOf;

  ({Lexer} = require('./lexer'));

  ({parser} = require('./parser'));

  helpers = require('./helpers');

  SourceMap = require('./sourcemap');

  // Require `package.json`, which is two levels above this file, as this file is
  // evaluated from `lib/coffeescript`.
  packageJson = require('../../package.json');

  // The current CoffeeScript version number.
  exports.VERSION = packageJson.version;

  exports.FILE_EXTENSIONS = FILE_EXTENSIONS = ['.coffee', '.litcoffee', '.coffee.md'];

  // Expose helpers for testing.
  exports.helpers = helpers;

  // Function that allows for btoa in both nodejs and the browser.
  base64encode = function(src) {
    switch (false) {
      case typeof Buffer !== 'function':
        return Buffer.from(src).toString('base64');
      case typeof btoa !== 'function':
        // The contents of a `<script>` block are encoded via UTF-16, so if any extended
        // characters are used in the block, btoa will fail as it maxes out at UTF-8.
        // See https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem
        // for the gory details, and for the solution implemented here.
        return btoa(encodeURIComponent(src).replace(/%([0-9A-F]{2})/g, function(match, p1) {
          return String.fromCharCode('0x' + p1);
        }));
      default:
        throw new Error('Unable to base64 encode inline sourcemap.');
    }
  };

  // Function wrapper to add source file information to SyntaxErrors thrown by the
  // lexer/parser/compiler.
  withPrettyErrors = function(fn) {
    return function(code, options = {}) {
      var err;
      try {
        return fn.call(this, code, options);
      } catch (error) {
        err = error;
        if (typeof code !== 'string') { // Support `CoffeeScript.nodes(tokens)`.
          throw err;
        }
        throw helpers.updateSyntaxError(err, code, options.filename);
      }
    };
  };

  // For each compiled file, save its source in memory in case we need to
  // recompile it later. We might need to recompile if the first compilation
  // didn’t create a source map (faster) but something went wrong and we need
  // a stack trace. Assuming that most of the time, code isn’t throwing
  // exceptions, it’s probably more efficient to compile twice only when we
  // need a stack trace, rather than always generating a source map even when
  // it’s not likely to be used. Save in form of `filename`: [`(source)`]
  sources = {};

  // Also save source maps if generated, in form of `(source)`: [`(source map)`].
  sourceMaps = {};

  // Compile CoffeeScript code to JavaScript, using the Coffee/Jison compiler.

  // If `options.sourceMap` is specified, then `options.filename` must also be
  // specified. All options that can be passed to `SourceMap#generate` may also
  // be passed here.

  // This returns a javascript string, unless `options.sourceMap` is passed,
  // in which case this returns a `{js, v3SourceMap, sourceMap}`
  // object, where sourceMap is a sourcemap.coffee#SourceMap object, handy for
  // doing programmatic lookups.
  exports.compile = compile = withPrettyErrors(function(code, options = {}) {
    var currentColumn, currentLine, encoded, filename, fragment, fragments, generateSourceMap, header, i, j, js, len, len1, map, newLines, ref, ref1, sourceMapDataURI, sourceURL, token, tokens, transpiler, transpilerOptions, transpilerOutput, v3SourceMap;
    // Clone `options`, to avoid mutating the `options` object passed in.
    options = Object.assign({}, options);
    // Always generate a source map if no filename is passed in, since without a
    // a filename we have no way to retrieve this source later in the event that
    // we need to recompile it to get a source map for `prepareStackTrace`.
    generateSourceMap = options.sourceMap || options.inlineMap || (options.filename == null);
    filename = options.filename || '<anonymous>';
    checkShebangLine(filename, code);
    if (sources[filename] == null) {
      sources[filename] = [];
    }
    sources[filename].push(code);
    if (generateSourceMap) {
      map = new SourceMap;
    }
    tokens = lexer.tokenize(code, options);
    // Pass a list of referenced variables, so that generated variables won’t get
    // the same name.
    options.referencedVars = (function() {
      var i, len, results;
      results = [];
      for (i = 0, len = tokens.length; i < len; i++) {
        token = tokens[i];
        if (token[0] === 'IDENTIFIER') {
          results.push(token[1]);
        }
      }
      return results;
    })();
    // Check for import or export; if found, force bare mode.
    if (!((options.bare != null) && options.bare === true)) {
      for (i = 0, len = tokens.length; i < len; i++) {
        token = tokens[i];
        if ((ref = token[0]) === 'IMPORT' || ref === 'EXPORT') {
          options.bare = true;
          break;
        }
      }
    }
    fragments = parser.parse(tokens).compileToFragments(options);
    currentLine = 0;
    if (options.header) {
      currentLine += 1;
    }
    if (options.shiftLine) {
      currentLine += 1;
    }
    currentColumn = 0;
    js = "";
    for (j = 0, len1 = fragments.length; j < len1; j++) {
      fragment = fragments[j];
      // Update the sourcemap with data from each fragment.
      if (generateSourceMap) {
        // Do not include empty, whitespace, or semicolon-only fragments.
        if (fragment.locationData && !/^[;\s]*$/.test(fragment.code)) {
          map.add([fragment.locationData.first_line, fragment.locationData.first_column], [currentLine, currentColumn], {
            noReplace: true
          });
        }
        newLines = helpers.count(fragment.code, "\n");
        currentLine += newLines;
        if (newLines) {
          currentColumn = fragment.code.length - (fragment.code.lastIndexOf("\n") + 1);
        } else {
          currentColumn += fragment.code.length;
        }
      }
      // Copy the code from each fragment into the final JavaScript.
      js += fragment.code;
    }
    if (options.header) {
      header = `Generated by CoffeeScript ${this.VERSION}`;
      js = `// ${header}\n${js}`;
    }
    if (generateSourceMap) {
      v3SourceMap = map.generate(options, code);
      if (sourceMaps[filename] == null) {
        sourceMaps[filename] = [];
      }
      sourceMaps[filename].push(map);
    }
    if (options.transpile) {
      if (typeof options.transpile !== 'object') {
        // This only happens if run via the Node API and `transpile` is set to
        // something other than an object.
        throw new Error('The transpile option must be given an object with options to pass to Babel');
      }
      // Get the reference to Babel that we have been passed if this compiler
      // is run via the CLI or Node API.
      transpiler = options.transpile.transpile;
      delete options.transpile.transpile;
      transpilerOptions = Object.assign({}, options.transpile);
      // See https://github.com/babel/babel/issues/827#issuecomment-77573107:
      // Babel can take a v3 source map object as input in `inputSourceMap`
      // and it will return an *updated* v3 source map object in its output.
      if (v3SourceMap && (transpilerOptions.inputSourceMap == null)) {
        transpilerOptions.inputSourceMap = v3SourceMap;
      }
      transpilerOutput = transpiler(js, transpilerOptions);
      js = transpilerOutput.code;
      if (v3SourceMap && transpilerOutput.map) {
        v3SourceMap = transpilerOutput.map;
      }
    }
    if (options.inlineMap) {
      encoded = base64encode(JSON.stringify(v3SourceMap));
      sourceMapDataURI = `//# sourceMappingURL=data:application/json;base64,${encoded}`;
      sourceURL = `//# sourceURL=${(ref1 = options.filename) != null ? ref1 : 'coffeescript'}`;
      js = `${js}\n${sourceMapDataURI}\n${sourceURL}`;
    }
    if (options.sourceMap) {
      return {
        js,
        sourceMap: map,
        v3SourceMap: JSON.stringify(v3SourceMap, null, 2)
      };
    } else {
      return js;
    }
  });

  // Tokenize a string of CoffeeScript code, and return the array of tokens.
  exports.tokens = withPrettyErrors(function(code, options) {
    return lexer.tokenize(code, options);
  });

  // Parse a string of CoffeeScript code or an array of lexed tokens, and
  // return the AST. You can then compile it by calling `.compile()` on the root,
  // or traverse it by using `.traverseChildren()` with a callback.
  exports.nodes = withPrettyErrors(function(source, options) {
    if (typeof source === 'string') {
      return parser.parse(lexer.tokenize(source, options));
    } else {
      return parser.parse(source);
    }
  });

  // This file used to export these methods; leave stubs that throw warnings
  // instead. These methods have been moved into `index.coffee` to provide
  // separate entrypoints for Node and non-Node environments, so that static
  // analysis tools don’t choke on Node packages when compiling for a non-Node
  // environment.
  exports.run = exports.eval = exports.register = function() {
    throw new Error('require index.coffee, not this file');
  };

  // Instantiate a Lexer for our use here.
  lexer = new Lexer;

  // The real Lexer produces a generic stream of tokens. This object provides a
  // thin wrapper around it, compatible with the Jison API. We can then pass it
  // directly as a "Jison lexer".
  parser.lexer = {
    lex: function() {
      var tag, token;
      token = parser.tokens[this.pos++];
      if (token) {
        [tag, this.yytext, this.yylloc] = token;
        parser.errorToken = token.origin || token;
        this.yylineno = this.yylloc.first_line;
      } else {
        tag = '';
      }
      return tag;
    },
    setInput: function(tokens) {
      parser.tokens = tokens;
      return this.pos = 0;
    },
    upcomingInput: function() {
      return '';
    }
  };

  // Make all the AST nodes visible to the parser.
  parser.yy = require('./nodes');

  // Override Jison's default error handling function.
  parser.yy.parseError = function(message, {token}) {
    var errorLoc, errorTag, errorText, errorToken, tokens;
    // Disregard Jison's message, it contains redundant line number information.
    // Disregard the token, we take its value directly from the lexer in case
    // the error is caused by a generated token which might refer to its origin.
    ({errorToken, tokens} = parser);
    [errorTag, errorText, errorLoc] = errorToken;
    errorText = (function() {
      switch (false) {
        case errorToken !== tokens[tokens.length - 1]:
          return 'end of input';
        case errorTag !== 'INDENT' && errorTag !== 'OUTDENT':
          return 'indentation';
        case errorTag !== 'IDENTIFIER' && errorTag !== 'NUMBER' && errorTag !== 'INFINITY' && errorTag !== 'STRING' && errorTag !== 'STRING_START' && errorTag !== 'REGEX' && errorTag !== 'REGEX_START':
          return errorTag.replace(/_START$/, '').toLowerCase();
        default:
          return helpers.nameWhitespaceCharacter(errorText);
      }
    })();
    // The second argument has a `loc` property, which should have the location
    // data for this token. Unfortunately, Jison seems to send an outdated `loc`
    // (from the previous token), so we take the location information directly
    // from the lexer.
    return helpers.throwSyntaxError(`unexpected ${errorText}`, errorLoc);
  };

  // Based on http://v8.googlecode.com/svn/branches/bleeding_edge/src/messages.js
  // Modified to handle sourceMap
  formatSourcePosition = function(frame, getSourceMapping) {
    var as, column, fileLocation, filename, functionName, isConstructor, isMethodCall, line, methodName, source, tp, typeName;
    filename = void 0;
    fileLocation = '';
    if (frame.isNative()) {
      fileLocation = "native";
    } else {
      if (frame.isEval()) {
        filename = frame.getScriptNameOrSourceURL();
        if (!filename) {
          fileLocation = `${frame.getEvalOrigin()}, `;
        }
      } else {
        filename = frame.getFileName();
      }
      filename || (filename = "<anonymous>");
      line = frame.getLineNumber();
      column = frame.getColumnNumber();
      // Check for a sourceMap position
      source = getSourceMapping(filename, line, column);
      fileLocation = source ? `${filename}:${source[0]}:${source[1]}` : `${filename}:${line}:${column}`;
    }
    functionName = frame.getFunctionName();
    isConstructor = frame.isConstructor();
    isMethodCall = !(frame.isToplevel() || isConstructor);
    if (isMethodCall) {
      methodName = frame.getMethodName();
      typeName = frame.getTypeName();
      if (functionName) {
        tp = as = '';
        if (typeName && functionName.indexOf(typeName)) {
          tp = `${typeName}.`;
        }
        if (methodName && functionName.indexOf(`.${methodName}`) !== functionName.length - methodName.length - 1) {
          as = ` [as ${methodName}]`;
        }
        return `${tp}${functionName}${as} (${fileLocation})`;
      } else {
        return `${typeName}.${methodName || '<anonymous>'} (${fileLocation})`;
      }
    } else if (isConstructor) {
      return `new ${functionName || '<anonymous>'} (${fileLocation})`;
    } else if (functionName) {
      return `${functionName} (${fileLocation})`;
    } else {
      return fileLocation;
    }
  };

  getSourceMap = function(filename, line, column) {
    var answer, i, map, ref, ref1, sourceLocation;
    if (!(filename === '<anonymous>' || (ref = filename.slice(filename.lastIndexOf('.')), indexOf.call(FILE_EXTENSIONS, ref) >= 0))) {
      // Skip files that we didn’t compile, like Node system files that appear in
      // the stack trace, as they never have source maps.
      return null;
    }
    if (filename !== '<anonymous>' && (sourceMaps[filename] != null)) {
      return sourceMaps[filename][sourceMaps[filename].length - 1];
    // CoffeeScript compiled in a browser or via `CoffeeScript.compile` or `.run`
    // may get compiled with `options.filename` that’s missing, which becomes
    // `<anonymous>`; but the runtime might request the stack trace with the
    // filename of the script file. See if we have a source map cached under
    // `<anonymous>` that matches the error.
    } else if (sourceMaps['<anonymous>'] != null) {
      ref1 = sourceMaps['<anonymous>'];
      // Work backwards from the most recent anonymous source maps, until we find
      // one that works. This isn’t foolproof; there is a chance that multiple
      // source maps will have line/column pairs that match. But we have no other
      // way to match them. `frame.getFunction().toString()` doesn’t always work,
      // and it’s not foolproof either.
      for (i = ref1.length - 1; i >= 0; i += -1) {
        map = ref1[i];
        sourceLocation = map.sourceLocation([line - 1, column - 1]);
        if (((sourceLocation != null ? sourceLocation[0] : void 0) != null) && (sourceLocation[1] != null)) {
          return map;
        }
      }
    }
    // If all else fails, recompile this source to get a source map. We need the
    // previous section (for `<anonymous>`) despite this option, because after it
    // gets compiled we will still need to look it up from
    // `sourceMaps['<anonymous>']` in order to find and return it. That’s why we
    // start searching from the end in the previous block, because most of the
    // time the source map we want is the last one.
    if (sources[filename] != null) {
      answer = compile(sources[filename][sources[filename].length - 1], {
        filename: filename,
        sourceMap: true,
        literate: helpers.isLiterate(filename)
      });
      return answer.sourceMap;
    } else {
      return null;
    }
  };

  // Based on [michaelficarra/CoffeeScriptRedux](http://goo.gl/ZTx1p)
  // NodeJS / V8 have no support for transforming positions in stack traces using
  // sourceMap, so we must monkey-patch Error to display CoffeeScript source
  // positions.
  Error.prepareStackTrace = function(err, stack) {
    var frame, frames, getSourceMapping;
    getSourceMapping = function(filename, line, column) {
      var answer, sourceMap;
      sourceMap = getSourceMap(filename, line, column);
      if (sourceMap != null) {
        answer = sourceMap.sourceLocation([line - 1, column - 1]);
      }
      if (answer != null) {
        return [answer[0] + 1, answer[1] + 1];
      } else {
        return null;
      }
    };
    frames = (function() {
      var i, len, results;
      results = [];
      for (i = 0, len = stack.length; i < len; i++) {
        frame = stack[i];
        if (frame.getFunction() === exports.run) {
          break;
        }
        results.push(`    at ${formatSourcePosition(frame, getSourceMapping)}`);
      }
      return results;
    })();
    return `${err.toString()}\n${frames.join('\n')}\n`;
  };

  checkShebangLine = function(file, input) {
    var args, firstLine, ref, rest;
    firstLine = input.split(/$/m)[0];
    rest = firstLine != null ? firstLine.match(/^#!\s*([^\s]+\s*)(.*)/) : void 0;
    args = rest != null ? (ref = rest[2]) != null ? ref.split(/\s/).filter(function(s) {
      return s !== '';
    }) : void 0 : void 0;
    if ((args != null ? args.length : void 0) > 1) {
      console.error('The script to be run begins with a shebang line with more than one\nargument. This script will fail on platforms such as Linux which only\nallow a single argument.');
      console.error(`The shebang line was: '${firstLine}' in file '${file}'`);
      return console.error(`The arguments were: ${JSON.stringify(args)}`);
    }
  };

}).call(this);