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

// Generated by CoffeeScript 1.6.0
(function() {
  var BALANCED_PAIRS, EXPRESSION_CLOSE, EXPRESSION_END, EXPRESSION_START, IMPLICIT_BLOCK, IMPLICIT_CALL, IMPLICIT_END, IMPLICIT_FUNC, IMPLICIT_UNSPACED_CALL, INVERSES, LINEBREAKS, SINGLE_CLOSERS, SINGLE_LINERS, generate, left, rite, _i, _len, _ref,
    __indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; },
    __slice = [].slice;

  generate = function(tag, value) {
    var tok;
    tok = [tag, value];
    tok.generated = true;
    return tok;
  };

  exports.Rewriter = (function() {

    function Rewriter() {}

    Rewriter.prototype.rewrite = function(tokens) {
      this.tokens = tokens;
      this.removeLeadingNewlines();
      this.removeMidExpressionNewlines();
      this.closeOpenCalls();
      this.closeOpenIndexes();
      this.addImplicitIndentation();
      this.tagPostfixConditionals();
      this.addImplicitBracesAndParens();
      this.addLocationDataToGeneratedTokens();
      return this.tokens;
    };

    Rewriter.prototype.scanTokens = function(block) {
      var i, token, tokens;
      tokens = this.tokens;
      i = 0;
      while (token = tokens[i]) {
        i += block.call(this, token, i, tokens);
      }
      return true;
    };

    Rewriter.prototype.detectEnd = function(i, condition, action) {
      var levels, token, tokens, _ref, _ref1;
      tokens = this.tokens;
      levels = 0;
      while (token = tokens[i]) {
        if (levels === 0 && condition.call(this, token, i)) {
          return action.call(this, token, i);
        }
        if (!token || levels < 0) {
          return action.call(this, token, i - 1);
        }
        if (_ref = token[0], __indexOf.call(EXPRESSION_START, _ref) >= 0) {
          levels += 1;
        } else if (_ref1 = token[0], __indexOf.call(EXPRESSION_END, _ref1) >= 0) {
          levels -= 1;
        }
        i += 1;
      }
      return i - 1;
    };

    Rewriter.prototype.removeLeadingNewlines = function() {
      var i, tag, _i, _len, _ref;
      _ref = this.tokens;
      for (i = _i = 0, _len = _ref.length; _i < _len; i = ++_i) {
        tag = _ref[i][0];
        if (tag !== 'TERMINATOR') {
          break;
        }
      }
      if (i) {
        return this.tokens.splice(0, i);
      }
    };

    Rewriter.prototype.removeMidExpressionNewlines = function() {
      return this.scanTokens(function(token, i, tokens) {
        var _ref;
        if (!(token[0] === 'TERMINATOR' && (_ref = this.tag(i + 1), __indexOf.call(EXPRESSION_CLOSE, _ref) >= 0))) {
          return 1;
        }
        tokens.splice(i, 1);
        return 0;
      });
    };

    Rewriter.prototype.closeOpenCalls = function() {
      var action, condition;
      condition = function(token, i) {
        var _ref;
        return ((_ref = token[0]) === ')' || _ref === 'CALL_END') || token[0] === 'OUTDENT' && this.tag(i - 1) === ')';
      };
      action = function(token, i) {
        return this.tokens[token[0] === 'OUTDENT' ? i - 1 : i][0] = 'CALL_END';
      };
      return this.scanTokens(function(token, i) {
        if (token[0] === 'CALL_START') {
          this.detectEnd(i + 1, condition, action);
        }
        return 1;
      });
    };

    Rewriter.prototype.closeOpenIndexes = function() {
      var action, condition;
      condition = function(token, i) {
        var _ref;
        return (_ref = token[0]) === ']' || _ref === 'INDEX_END';
      };
      action = function(token, i) {
        return token[0] = 'INDEX_END';
      };
      return this.scanTokens(function(token, i) {
        if (token[0] === 'INDEX_START') {
          this.detectEnd(i + 1, condition, action);
        }
        return 1;
      });
    };

    Rewriter.prototype.matchTags = function() {
      var fuzz, i, j, pattern, _i, _ref, _ref1;
      i = arguments[0], pattern = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
      fuzz = 0;
      for (j = _i = 0, _ref = pattern.length; 0 <= _ref ? _i < _ref : _i > _ref; j = 0 <= _ref ? ++_i : --_i) {
        while (this.tag(i + j + fuzz) === 'HERECOMMENT') {
          fuzz += 2;
        }
        if (pattern[j] == null) {
          continue;
        }
        if (typeof pattern[j] === 'string') {
          pattern[j] = [pattern[j]];
        }
        if (_ref1 = this.tag(i + j + fuzz), __indexOf.call(pattern[j], _ref1) < 0) {
          return false;
        }
      }
      return true;
    };

    Rewriter.prototype.looksObjectish = function(j) {
      return this.matchTags(j, '@', null, ':') || this.matchTags(j, null, ':');
    };

    Rewriter.prototype.findTagsBackwards = function(i, tags) {
      var backStack, _ref, _ref1, _ref2, _ref3, _ref4, _ref5;
      backStack = [];
      while (i >= 0 && (backStack.length || (_ref2 = this.tag(i), __indexOf.call(tags, _ref2) < 0) && ((_ref3 = this.tag(i), __indexOf.call(EXPRESSION_START, _ref3) < 0) || this.tokens[i].generated) && (_ref4 = this.tag(i), __indexOf.call(LINEBREAKS, _ref4) < 0))) {
        if (_ref = this.tag(i), __indexOf.call(EXPRESSION_END, _ref) >= 0) {
          backStack.push(this.tag(i));
        }
        if ((_ref1 = this.tag(i), __indexOf.call(EXPRESSION_START, _ref1) >= 0) && backStack.length) {
          backStack.pop();
        }
        i -= 1;
      }
      return _ref5 = this.tag(i), __indexOf.call(tags, _ref5) >= 0;
    };

    Rewriter.prototype.addImplicitBracesAndParens = function() {
      var stack;
      stack = [];
      return this.scanTokens(function(token, i, tokens) {
        var endImplicitCall, endImplicitObject, forward, inImplicit, inImplicitCall, inImplicitControl, inImplicitObject, nextTag, offset, prevTag, s, sameLine, stackIdx, stackTag, stackTop, startIdx, startImplicitCall, startImplicitObject, startsLine, tag, _ref, _ref1, _ref2, _ref3, _ref4, _ref5;
        tag = token[0];
        prevTag = (i > 0 ? tokens[i - 1] : [])[0];
        nextTag = (i < tokens.length - 1 ? tokens[i + 1] : [])[0];
        stackTop = function() {
          return stack[stack.length - 1];
        };
        startIdx = i;
        forward = function(n) {
          return i - startIdx + n;
        };
        inImplicit = function() {
          var _ref, _ref1;
          return (_ref = stackTop()) != null ? (_ref1 = _ref[2]) != null ? _ref1.ours : void 0 : void 0;
        };
        inImplicitCall = function() {
          var _ref;
          return inImplicit() && ((_ref = stackTop()) != null ? _ref[0] : void 0) === '(';
        };
        inImplicitObject = function() {
          var _ref;
          return inImplicit() && ((_ref = stackTop()) != null ? _ref[0] : void 0) === '{';
        };
        inImplicitControl = function() {
          var _ref;
          return inImplicit && ((_ref = stackTop()) != null ? _ref[0] : void 0) === 'CONTROL';
        };
        startImplicitCall = function(j) {
          var idx;
          idx = j != null ? j : i;
          stack.push([
            '(', idx, {
              ours: true
            }
          ]);
          tokens.splice(idx, 0, generate('CALL_START', '('));
          if (j == null) {
            return i += 1;
          }
        };
        endImplicitCall = function() {
          stack.pop();
          tokens.splice(i, 0, generate('CALL_END', ')'));
          return i += 1;
        };
        startImplicitObject = function(j, startsLine) {
          var idx;
          if (startsLine == null) {
            startsLine = true;
          }
          idx = j != null ? j : i;
          stack.push([
            '{', idx, {
              sameLine: true,
              startsLine: startsLine,
              ours: true
            }
          ]);
          tokens.splice(idx, 0, generate('{', generate(new String('{'))));
          if (j == null) {
            return i += 1;
          }
        };
        endImplicitObject = function(j) {
          j = j != null ? j : i;
          stack.pop();
          tokens.splice(j, 0, generate('}', '}'));
          return i += 1;
        };
        if (inImplicitCall() && (tag === 'IF' || tag === 'TRY' || tag === 'FINALLY' || tag === 'CATCH' || tag === 'CLASS' || tag === 'SWITCH')) {
          stack.push([
            'CONTROL', i, {
              ours: true
            }
          ]);
          return forward(1);
        }
        if (tag === 'INDENT' && inImplicit()) {
          if (prevTag !== '=>' && prevTag !== '->' && prevTag !== '[' && prevTag !== '(' && prevTag !== ',' && prevTag !== '{' && prevTag !== 'TRY' && prevTag !== 'ELSE' && prevTag !== '=') {
            while (inImplicitCall()) {
              endImplicitCall();
            }
          }
          if (inImplicitControl()) {
            stack.pop();
          }
          stack.push([tag, i]);
          return forward(1);
        }
        if (__indexOf.call(EXPRESSION_START, tag) >= 0) {
          stack.push([tag, i]);
          return forward(1);
        }
        if (__indexOf.call(EXPRESSION_END, tag) >= 0) {
          while (inImplicit()) {
            if (inImplicitCall()) {
              endImplicitCall();
            } else if (inImplicitObject()) {
              endImplicitObject();
            } else {
              stack.pop();
            }
          }
          stack.pop();
        }
        if ((__indexOf.call(IMPLICIT_FUNC, tag) >= 0 && token.spaced || tag === '?' && i > 0 && !tokens[i - 1].spaced) && (__indexOf.call(IMPLICIT_CALL, nextTag) >= 0 || __indexOf.call(IMPLICIT_UNSPACED_CALL, nextTag) >= 0 && !((_ref = tokens[i + 1]) != null ? _ref.spaced : void 0) && !((_ref1 = tokens[i + 1]) != null ? _ref1.newLine : void 0))) {
          if (tag === '?') {
            tag = token[0] = 'FUNC_EXIST';
          }
          startImplicitCall(i + 1);
          return forward(2);
        }
        if (this.matchTags(i, IMPLICIT_FUNC, 'INDENT', null, ':') && !this.findTagsBackwards(i, ['CLASS', 'EXTENDS', 'IF', 'CATCH', 'SWITCH', 'LEADING_WHEN', 'FOR', 'WHILE', 'UNTIL'])) {
          startImplicitCall(i + 1);
          stack.push(['INDENT', i + 2]);
          return forward(3);
        }
        if (tag === ':') {
          if (this.tag(i - 2) === '@') {
            s = i - 2;
          } else {
            s = i - 1;
          }
          while (this.tag(s - 2) === 'HERECOMMENT') {
            s -= 2;
          }
          startsLine = s === 0 || (_ref2 = this.tag(s - 1), __indexOf.call(LINEBREAKS, _ref2) >= 0) || tokens[s - 1].newLine;
          if (stackTop()) {
            _ref3 = stackTop(), stackTag = _ref3[0], stackIdx = _ref3[1];
            if ((stackTag === '{' || stackTag === 'INDENT' && this.tag(stackIdx - 1) === '{') && (startsLine || this.tag(s - 1) === ',' || this.tag(s - 1) === '{')) {
              return forward(1);
            }
          }
          startImplicitObject(s, !!startsLine);
          return forward(2);
        }
        if (prevTag === 'OUTDENT' && inImplicitCall() && (tag === '.' || tag === '?.' || tag === '::' || tag === '?::')) {
          endImplicitCall();
          return forward(1);
        }
        if (inImplicitObject() && __indexOf.call(LINEBREAKS, tag) >= 0) {
          stackTop()[2].sameLine = false;
        }
        if (__indexOf.call(IMPLICIT_END, tag) >= 0) {
          while (inImplicit()) {
            _ref4 = stackTop(), stackTag = _ref4[0], stackIdx = _ref4[1], (_ref5 = _ref4[2], sameLine = _ref5.sameLine, startsLine = _ref5.startsLine);
            if (inImplicitCall() && prevTag !== ',') {
              endImplicitCall();
            } else if (inImplicitObject() && sameLine && !startsLine) {
              endImplicitObject();
            } else if (inImplicitObject() && tag === 'TERMINATOR' && prevTag !== ',' && !(startsLine && this.looksObjectish(i + 1))) {
              endImplicitObject();
            } else {
              break;
            }
          }
        }
        if (tag === ',' && !this.looksObjectish(i + 1) && inImplicitObject() && (nextTag !== 'TERMINATOR' || !this.looksObjectish(i + 2))) {
          offset = nextTag === 'OUTDENT' ? 1 : 0;
          while (inImplicitObject()) {
            endImplicitObject(i + offset);
          }
        }
        return forward(1);
      });
    };

    Rewriter.prototype.addLocationDataToGeneratedTokens = function() {
      return this.scanTokens(function(token, i, tokens) {
        var last_column, last_line, _ref, _ref1, _ref2;
        if (token[2]) {
          return 1;
        }
        if (!(token.generated || token.explicit)) {
          return 1;
        }
        _ref2 = (_ref = (_ref1 = tokens[i - 1]) != null ? _ref1[2] : void 0) != null ? _ref : {
          last_line: 0,
          last_column: 0
        }, last_line = _ref2.last_line, last_column = _ref2.last_column;
        token[2] = {
          first_line: last_line,
          first_column: last_column,
          last_line: last_line,
          last_column: last_column
        };
        return 1;
      });
    };

    Rewriter.prototype.addImplicitIndentation = function() {
      var action, condition, indent, outdent, starter;
      starter = indent = outdent = null;
      condition = function(token, i) {
        var _ref;
        return token[1] !== ';' && (_ref = token[0], __indexOf.call(SINGLE_CLOSERS, _ref) >= 0) && !(token[0] === 'ELSE' && (starter !== 'IF' && starter !== 'THEN'));
      };
      action = function(token, i) {
        return this.tokens.splice((this.tag(i - 1) === ',' ? i - 1 : i), 0, outdent);
      };
      return this.scanTokens(function(token, i, tokens) {
        var tag, _ref, _ref1;
        tag = token[0];
        if (tag === 'TERMINATOR' && this.tag(i + 1) === 'THEN') {
          tokens.splice(i, 1);
          return 0;
        }
        if (tag === 'ELSE' && this.tag(i - 1) !== 'OUTDENT') {
          tokens.splice.apply(tokens, [i, 0].concat(__slice.call(this.indentation(token))));
          return 2;
        }
        if (tag === 'CATCH' && ((_ref = this.tag(i + 2)) === 'OUTDENT' || _ref === 'TERMINATOR' || _ref === 'FINALLY')) {
          tokens.splice.apply(tokens, [i + 2, 0].concat(__slice.call(this.indentation(token))));
          return 4;
        }
        if (__indexOf.call(SINGLE_LINERS, tag) >= 0 && this.tag(i + 1) !== 'INDENT' && !(tag === 'ELSE' && this.tag(i + 1) === 'IF')) {
          starter = tag;
          _ref1 = this.indentation(token, true), indent = _ref1[0], outdent = _ref1[1];
          if (starter === 'THEN') {
            indent.fromThen = true;
          }
          tokens.splice(i + 1, 0, indent);
          this.detectEnd(i + 2, condition, action);
          if (tag === 'THEN') {
            tokens.splice(i, 1);
          }
          return 1;
        }
        return 1;
      });
    };

    Rewriter.prototype.tagPostfixConditionals = function() {
      var action, condition, original;
      original = null;
      condition = function(token, i) {
        var _ref;
        return (_ref = token[0]) === 'TERMINATOR' || _ref === 'INDENT';
      };
      action = function(token, i) {
        if (token[0] !== 'INDENT' || (token.generated && !token.fromThen)) {
          return original[0] = 'POST_' + original[0];
        }
      };
      return this.scanTokens(function(token, i) {
        if (token[0] !== 'IF') {
          return 1;
        }
        original = token;
        this.detectEnd(i + 1, condition, action);
        return 1;
      });
    };

    Rewriter.prototype.indentation = function(token, implicit) {
      var indent, outdent;
      if (implicit == null) {
        implicit = false;
      }
      indent = ['INDENT', 2];
      outdent = ['OUTDENT', 2];
      if (implicit) {
        indent.generated = outdent.generated = true;
      }
      if (!implicit) {
        indent.explicit = outdent.explicit = true;
      }
      return [indent, outdent];
    };

    Rewriter.prototype.generate = generate;

    Rewriter.prototype.tag = function(i) {
      var _ref;
      return (_ref = this.tokens[i]) != null ? _ref[0] : void 0;
    };

    return Rewriter;

  })();

  BALANCED_PAIRS = [['(', ')'], ['[', ']'], ['{', '}'], ['INDENT', 'OUTDENT'], ['CALL_START', 'CALL_END'], ['PARAM_START', 'PARAM_END'], ['INDEX_START', 'INDEX_END']];

  exports.INVERSES = INVERSES = {};

  EXPRESSION_START = [];

  EXPRESSION_END = [];

  for (_i = 0, _len = BALANCED_PAIRS.length; _i < _len; _i++) {
    _ref = BALANCED_PAIRS[_i], left = _ref[0], rite = _ref[1];
    EXPRESSION_START.push(INVERSES[rite] = left);
    EXPRESSION_END.push(INVERSES[left] = rite);
  }

  EXPRESSION_CLOSE = ['CATCH', 'WHEN', 'ELSE', 'FINALLY'].concat(EXPRESSION_END);

  IMPLICIT_FUNC = ['IDENTIFIER', 'SUPER', ')', 'CALL_END', ']', 'INDEX_END', '@', 'THIS'];

  IMPLICIT_CALL = ['IDENTIFIER', 'NUMBER', 'STRING', 'JS', 'REGEX', 'NEW', 'PARAM_START', 'CLASS', 'IF', 'TRY', 'SWITCH', 'THIS', 'BOOL', 'NULL', 'UNDEFINED', 'UNARY', 'SUPER', '@', '->', '=>', '[', '(', '{', '--', '++'];

  IMPLICIT_UNSPACED_CALL = ['+', '-'];

  IMPLICIT_BLOCK = ['->', '=>', '{', '[', ','];

  IMPLICIT_END = ['POST_IF', 'FOR', 'WHILE', 'UNTIL', 'WHEN', 'BY', 'LOOP', 'TERMINATOR'];

  SINGLE_LINERS = ['ELSE', '->', '=>', 'TRY', 'FINALLY', 'THEN'];

  SINGLE_CLOSERS = ['TERMINATOR', 'CATCH', 'FINALLY', 'ELSE', 'OUTDENT', 'LEADING_WHEN'];

  LINEBREAKS = ['TERMINATOR', 'INDENT', 'OUTDENT'];

}).call(this);