protected override JavaScriptObject Execute(SourcePosition pos, Scope scope, JavaScriptObject thisObject)
{
JavaScriptString str = scope.GetVariable("string", pos).ToJavaScriptString();
Console.Write(str.ToString());
return null;
}
/**
* @param left Left operand
* @param right Right operand
*/
protected BinaryOpNode(SourcePosition pos, String oper, Node left, Node right)
: base(pos)
{
this.oper = oper;
this.left = left;
this.right = right;
}
public TooFewArgumentsException(
String functionName,
int noArgsRequired,
int noArgs,
SourcePosition pos)
: base(functionName + " expects at least " + noArgsRequired
+ " arguments but got " + noArgs, pos)
{
}
protected override JavaScriptObject Execute(SourcePosition pos, Scope scope, JavaScriptObject thisObject)
{
JavaScriptArray array = (JavaScriptArray)thisObject;
FunctionArguments args = (FunctionArguments)scope.GetVariable("arguments", pos);
foreach (JavaScriptObject obj in args)
{
array.Add(obj);
}
return array;
}
public JavaScriptObject GetVariable(string functionName, SourcePosition sourcePosition)
{
if (variablesAndFunctions.ContainsKey(functionName))
{
return variablesAndFunctions[functionName];
}
else if (parentscope != null)
{
return parentscope.GetVariable(functionName, sourcePosition);
}
throw new UnsetVariableException(functionName, sourcePosition);
}
public Function GetFunction(string functionName, SourcePosition sourcePosition)
{
if (this.HasFunction(functionName))
{
return (Function)variablesAndFunctions[functionName];
}
else if (parentscope != null)
{
return parentscope.GetFunction(functionName, sourcePosition);
}
throw new UnsetFunctionException(functionName, sourcePosition);
}
public UnsetPropertyException(string propertyName, SourcePosition pos)
: base(propertyName + " is not set", pos)
{
}
public UnsetFunctionException(String functionName, SourcePosition pos)
: base("Function '" + functionName + "' does not exist", pos)
{
}
private Token MatchStringLiteral(char quote)
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
Match(quote);
StringBuilder sb = new StringBuilder();
int character = LookAhead(1);
while (character != quote && character != END_OF_FILE)
{
sb.Append((char)character);
character = Next();
}
Match(quote);
return new Token(pos, TokenType.STRING_LITERAL, sb.ToString());
}
private Token MatchLineComment()
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
Match("//");
StringBuilder sb = new StringBuilder();
int character = LookAhead(1);
while (character != '\r' && character != '\n' && character != END_OF_FILE)
{
sb.Append((char)character);
character = Next();
}
return new Token(pos, TokenType.COMMENT, sb.ToString());
}
private Token MatchBlockComment()
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
Match("/*");
StringBuilder sb = new StringBuilder();
int character = LookAhead(1);
while (true)
{
if (character == END_OF_FILE)
{
throw new LexerException("Expecting */ but found end of file", lineNo, columnNo);
}
if (LookAhead(1) == '*' && LookAhead(2) == '/')
{
break;
}
sb.Append((char)character);
character = Next();
}
Match("*/");
return new Token(pos, TokenType.COMMENT, sb.ToString());
}
public InterpreterException(String message, SourcePosition position)
: base(message + " on line " + position.GetLineNumber() +
" at column " + position.GetColumnNumber())
{
}
public UnsetVariableException(String variableName, SourcePosition pos)
: base("'" + variableName + "' is not set", pos)
{
}
public UnsetFunctionException(String functionName, SourcePosition pos)
: base("Function '" + functionName + "' does not exist", pos)
{
}
private Node Statement()
{
// | (ID LPAREN) => functionCall END_STATEMENT
// | VARIABLE! ASSIGN! expression END_STATEMENT
// | RETURN expression END_STATEMENT
// | IF | WHILE | FOR_EACH
TokenType type = LookAhead(1);
if (type == TokenType.VARIABLE && LookAhead(2) == TokenType.LPAREN)
{
Node funcCall = FunctionCall();
Match(TokenType.END_STATEMENT);
return(funcCall);
}
else if (type == TokenType.VARIABLE &&
((LookAhead(2) == TokenType.PLUS && LookAhead(3) == TokenType.PLUS) || // i++;
(LookAhead(2) == TokenType.MINUS) && LookAhead(3) == TokenType.MINUS) || // i--;
((LookAhead(2) == TokenType.PLUS || LookAhead(2) == TokenType.MINUS) && // i+=n; or i-=n;
LookAhead(3) == TokenType.EQUAL))
{
Node selfExpression = Expression();
Match(TokenType.END_STATEMENT);
return(selfExpression);
}
else if (type == TokenType.VARIABLE || type == TokenType.VAR)
{
return(VariableDeclaration());
}
else if (type == TokenType.RETURN)
{
SourcePosition pos = Match(TokenType.RETURN).Position;
Node expression = Expression();
Match(TokenType.END_STATEMENT);
return(new ReturnNode(pos, expression));
}
else if (type == TokenType.IF)
{
return(If());
}
else if (type == TokenType.WHILE)
{
return(While());
}
else if (type == TokenType.FOR)
{
return(For());
}
else if (type == TokenType.FUNCTION)
{
return(FunctionDeclaration());
}
else if (type == TokenType.THIS)
{
return(This());
}
else if (type == TokenType.TRY)
{
return(TryCatch());
}
else
{
// We only get here if there is token from the lexer
// that is not handled by parser yet.
throw new ParserException("Unknown token type " + type);
}
}
public InvalidTypeException(String message, SourcePosition position)
: base(message, position)
{
}
public TypeMismatchException(SourcePosition pos, Type expect, Type actual)
: base("Type mismatch - Excepted type '" + ToString(expect) + "' but got type '" + ToString(actual) + "'", pos)
{
}
private Token CreateToken(TokenType type, char c)
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
Match(c);
return new Token(pos, type, "" + c);
}
public InvalidTypeException(String message, SourcePosition position)
: base(message, position)
{
}
public UnsetPropertyException(string propertyName, SourcePosition pos)
: base(propertyName + " is not set", pos)
{
}
public ArrayNode(SourcePosition pos, List<Node> elements)
: base(pos)
{
this.elements = elements;
}
/**
* An identifier is either a keyword, function, or variable
*
* @return Token
*/
private Token MatchIdentifier()
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
StringBuilder sb = new StringBuilder();
char character = LookAhead(1);
while ((character >= 'a' && character <= 'z') ||
(character >= 'A' && character <= 'Z') ||
(character >= '0' && character <= '9') ||
character == '_')
{
sb.Append((char)character);
character = Next();
}
String word = sb.ToString();
if (word.Equals("true"))
{
return(new Token(pos, TokenType.TRUE, word));
}
else if (word.Equals("false"))
{
return(new Token(pos, TokenType.FALSE, word));
}
else if (word.Equals("if"))
{
return(new Token(pos, TokenType.IF, word));
}
else if (word.Equals("else"))
{
return(new Token(pos, TokenType.ELSE, word));
}
else if (word.Equals("while"))
{
return(new Token(pos, TokenType.WHILE, word));
}
else if (word.Equals("for"))
{
return(new Token(pos, TokenType.FOR, word));
}
else if (word.Equals("as"))
{
return(new Token(pos, TokenType.IN, word));
}
else if (word.Equals("function"))
{
return(new Token(pos, TokenType.FUNCTION, word));
}
else if (word.Equals("var"))
{
return(new Token(pos, TokenType.VAR, word));
}
else if (word.Equals("return"))
{
return(new Token(pos, TokenType.RETURN, word));
}
else if (word.Equals("new"))
{
return(new Token(pos, TokenType.NEW, word));
}
else if (word.Equals("this"))
{
return(new Token(pos, TokenType.THIS, word));
}
//else if (word.Equals("prototype"))
//{
// return new Token(pos, TokenType.PROTOTYPE, word);
//}
else if (word.Equals("try"))
{
return(new Token(pos, TokenType.TRY, word));
}
else if (word.Equals("catch"))
{
return(new Token(pos, TokenType.CATCH, word));
}
else if (word.Equals("finally"))
{
return(new Token(pos, TokenType.FINALLY, word));
}
else
{
return(new Token(pos, TokenType.VARIABLE, word));
}
}
private Token CreateToken(TokenType type, String str)
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
Match(str);
return new Token(pos, type, str);
}
public ParserException(String message, SourcePosition position)
: base(message, position)
{
}
/**
* An identifier is either a keyword, function, or variable
*
* @return Token
*/
private Token MatchIdentifier()
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
StringBuilder sb = new StringBuilder();
char character = LookAhead(1);
while ((character >= 'a' && character <= 'z') ||
(character >= 'A' && character <= 'Z') ||
(character >= '0' && character <= '9') ||
character == '_')
{
sb.Append((char)character);
character = Next();
}
String word = sb.ToString();
if (word.Equals("true"))
{
return new Token(pos, TokenType.TRUE, word);
}
else if (word.Equals("false"))
{
return new Token(pos, TokenType.FALSE, word);
}
else if (word.Equals("if"))
{
return new Token(pos, TokenType.IF, word);
}
else if (word.Equals("else"))
{
return new Token(pos, TokenType.ELSE, word);
}
else if (word.Equals("while"))
{
return new Token(pos, TokenType.WHILE, word);
}
else if (word.Equals("for"))
{
return new Token(pos, TokenType.FOR, word);
}
else if (word.Equals("as"))
{
return new Token(pos, TokenType.IN, word);
}
else if (word.Equals("function"))
{
return new Token(pos, TokenType.FUNCTION, word);
}
else if (word.Equals("var"))
{
return new Token(pos, TokenType.VAR, word);
}
else if (word.Equals("return"))
{
return new Token(pos, TokenType.RETURN, word);
}
else if (word.Equals("new"))
{
return new Token(pos, TokenType.NEW, word);
}
else if (word.Equals("this"))
{
return new Token(pos, TokenType.THIS, word);
}
//else if (word.Equals("prototype"))
//{
// return new Token(pos, TokenType.PROTOTYPE, word);
//}
else if (word.Equals("try"))
{
return new Token(pos, TokenType.TRY, word);
}
else if (word.Equals("catch"))
{
return new Token(pos, TokenType.CATCH, word);
}
else if (word.Equals("finally"))
{
return new Token(pos, TokenType.FINALLY, word);
}
else
{
return new Token(pos, TokenType.VARIABLE, word);
}
}
protected override JavaScriptObject Execute(SourcePosition pos, Scope scope, JavaScriptObject thisObject)
{
JavaScriptInteger integer = scope.GetVariable("number", pos).ToInteger();
return new JavaScriptInteger(integer.Value * integer.Value);
}
private Token MatchNumber()
{
SourcePosition pos = new SourcePosition(lineNo, columnNo);
StringBuilder sb = new StringBuilder();
bool isDecimal = false;
int character = LookAhead(1);
while ((character >= '0' && character <= '9') || character == '.')
{
if (isDecimal && character == '.')
{
throw new LexerException("Unexcepted '.' character", lineNo, columnNo);
}
else if (character == '.')
{
isDecimal = true;
}
sb.Append((char)character);
character = Next();
}
if (isDecimal)
{
return new Token(pos, TokenType.FLOAT, sb.ToString());
}
else
{
return new Token(pos, TokenType.INTEGER, sb.ToString());
}
}
public InterpreterException(String message, SourcePosition position)
: base(message + " on line " + position.GetLineNumber() +
" at column " + position.GetColumnNumber())
{
}
protected override JavaScriptObject Execute(SourcePosition pos, Scope scope, JavaScriptObject thisObject)
{
JavaScriptString str = scope.GetVariable("string", pos).ToJavaScriptString();
return new JavaScriptInteger(str.ToString().Length);
}
public Token(SourcePosition position, TokenType type, String text)
{
this.position = position;
this.type = type;
this.text = text;
}