Code coverage report for sc/lang/compiler/parser/function-expr.js

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(function(sc) {
  "use strict";
 
  require("./parser");
 
  var Node = sc.lang.compiler.Node;
  var Parser = sc.lang.compiler.Parser;
 
  /*
    FunctionExpression :
      { FunctionParameterDeclaration(opt) FunctionBody(opt) }
 
    FunctionParameterDeclaration :
         | FunctionParameter |
      args FunctionParameter ;
 
    FunctionParameter :
      FunctionParameterElements
      FunctionParameterElements ... Identifier
                                ... Identifier
 
    FunctionParameterElements :
      FunctionParameterElement
      FunctionParameterElements , FunctionParameterElement
 
    FunctionParameterElement :
      Identifier
      Identifier = parsePrimaryArgExpression
  */
  Parser.addParseMethod("FunctionExpression", function(opts) {
    return new FunctionExpressionParser(this).parse(opts);
  });
 
  /*
    FunctionBody :
      VariableStatements(opt) SourceElements(opt)
 
    VariableStatements :
      VariableStatement
      VariableStatements VariableStatement
 
    SourceElements :
      Expression
      SourceElements ; Expression
  */
  Parser.addParseMethod("FunctionBody", function() {
    return new FunctionExpressionParser(this).parseFunctionBody();
  });
 
  /*
    ClosedFunctionExpression :
      # FunctionExpression
  */
  Parser.addParseMethod("ClosedFunctionExpression", function() {
    var marker = this.createMarker();
    this.expect("#");
 
    var expr = this.parseFunctionExpression({ closed: true });
 
    return marker.update().apply(expr, true);
  });
 
  function FunctionExpressionParser(parent) {
    Parser.call(this, parent);
  }
  sc.libs.extend(FunctionExpressionParser, Parser);
 
  FunctionExpressionParser.prototype.parse = function(opts) {
    opts = opts || {};
 
    var marker = this.createMarker();
 
    this.expect("{");
 
    var node = this.withScope(function() {
      var args = this.parseFunctionParameterDeclaration();
      var body = this.parseFunctionBody();
      return Node.createFunctionExpression(args, body, opts);
    });
 
    this.expect("}");
 
    return marker.update().apply(node);
  };
 
  FunctionExpressionParser.prototype.parseFunctionParameterDeclaration = function() {
    if (this.match("|")) {
      return this.parseFunctionParameter("|");
    }
    if (this.match("arg")) {
      return this.parseFunctionParameter(";");
    }
    return null;
  };
 
  FunctionExpressionParser.prototype.parseFunctionParameter = function(sentinel) {
    this.lex();
 
    var args = {
      list: this.parseFunctionParameterElements(sentinel)
    };
 
    if (this.match("...")) {
      this.lex();
      args.remain = this.parseIdentifier({ variable: true });
      this.addToScope("arg", args.remain.name);
    }
 
    this.expect(sentinel);
 
    return args;
  };
 
  FunctionExpressionParser.prototype.parseFunctionParameterElements = function(sentinel) {
    var elements = [];
 
    if (!this.match("...")) {
      while (this.hasNextToken()) {
        elements.push(this.parseFunctionParameterElement());
        if (this.matchAny([ sentinel, "..." ]) || (sentinel === ";" && !this.match(","))) {
          break;
        }
        if (this.match(",")) {
          this.lex();
        }
      }
    }
 
    return elements;
  };
 
  FunctionExpressionParser.prototype.parseFunctionParameterElement = function() {
    return this.parseDeclarator({
      type: "arg",
      delegate: function() {
        return this.parsePrimaryArgExpression();
      }
    });
  };
 
  FunctionExpressionParser.prototype.parseFunctionBody = function() {
    return this.parseVariableStatements().concat(this.parseSourceElements());
  };
 
  FunctionExpressionParser.prototype.parseVariableStatements = function() {
    var elements = [];
 
    while (this.match("var")) {
      elements.push(this.parseVariableStatement());
    }
 
    return elements;
  };
 
  FunctionExpressionParser.prototype.parseSourceElements = function() {
    var elements = [];
 
    while (this.hasNextToken() && !this.matchAny([ "}", ")" ])) {
      elements.push(this.parseExpression());
      if (this.matchAny([ "}", ")" ])) {
        break;
      }
      if (this.hasNextToken()) {
        this.expect(";");
      }
    }
 
    return elements;
  };
})(sc);