private void ParseFunctionParameterList(ScriptFunction func)
{
Modifiers modifiers;
bool atEndOfParameterList = false;
while ((!atEndOfParameterList) &&
(!_source.NextIsKeyword(PredefinedSymbol.CloseParenthesis)))
{
modifiers = new Modifiers();
while (_source.PeekNextToken() is ModifierToken)
{
modifiers.Add((ModifierToken)_source.ReadNextToken());
}
if (_source.NextIsKeyword(PredefinedSymbol.VariableArguments))
{
func.VariableArguments = true;
_source.ExpectKeyword(PredefinedSymbol.CloseParenthesis, "Variable arguments must be the last parameter");
break;
}
Token parameterType = _source.ReadNextAsVariableType();
Token parameterName = null;
_source.IgnoreAsteriskIfPresent();
CompilerUtils.VerifyModifiersAgainstType(ModifierTargets.FunctionParameter, modifiers);
VerifyParameterTypeValidForFunction(parameterType);
if (!_source.PeekNextToken().Defined)
{
parameterName = _source.ReadNextTokenAndThrowIfAlreadyDefined();
}
else
{
func.IsPrototypeOnly = true;
}
FunctionParameter parameter = new FunctionParameter(parameterType, parameterName);
parameter.Modifiers = modifiers;
if (_source.NextIsKeyword(PredefinedSymbol.SetEqual))
{
parameter.DefaultValue = _source.ReadNextAsConstInt();
}
if (_source.NextIsKeyword(PredefinedSymbol.CloseParenthesis))
{
atEndOfParameterList = true;
}
else
{
_source.ExpectKeyword(PredefinedSymbol.Comma);
}
func.Parameters.Add(parameter);
}
}
private Expression ReadExpression(ScriptReader source, bool readTerminatingSymbolFromStream, params PredefinedSymbol[] endsWithSymbols)
{
Expression expression = new Expression();
int bracketLevel = 0;
while (bracketLevel >= 0)
{
foreach (PredefinedSymbol terminatingSymbol in endsWithSymbols)
{
if ((bracketLevel == 0) && (source.NextIsKeyword(terminatingSymbol, !readTerminatingSymbolFromStream)))
{
return(expression);
}
}
Token thisToken = source.PeekNextToken();
if (thisToken is EndOfStreamToken)
{
throw new CompilerMessage(ErrorCode.EndOfInputReached, "End of script reached in the middle of an expression");
}
CompilerUtils.AdjustBracketLevelIfTokenIsBracket(thisToken, ref bracketLevel);
if (bracketLevel >= 0)
{
expression.Add(source.ReadNextToken());
}
}
throw new CompilerMessage(ErrorCode.UnexpectedToken, "Unexpected '" + source.ReadNextToken() + "'");
}
private Expression ReadExpression(ScriptReader source, bool readTerminatingSymbolFromStream, params PredefinedSymbol[] endsWithSymbols)
{
Expression expression = new Expression();
int bracketLevel = 0;
while (bracketLevel >= 0)
{
foreach (PredefinedSymbol terminatingSymbol in endsWithSymbols)
{
if ((bracketLevel == 0) && (source.NextIsKeyword(terminatingSymbol, !readTerminatingSymbolFromStream)))
{
return expression;
}
}
Token thisToken = source.PeekNextToken();
if (thisToken is EndOfStreamToken)
{
throw new CompilerMessage(ErrorCode.EndOfInputReached, "End of script reached in the middle of an expression");
}
CompilerUtils.AdjustBracketLevelIfTokenIsBracket(thisToken, ref bracketLevel);
if (bracketLevel >= 0)
{
expression.Add(source.ReadNextToken());
}
}
throw new CompilerMessage(ErrorCode.UnexpectedToken, "Unexpected '" + source.ReadNextToken() + "'");
}
private void ProcessNextCodeStatement(bool allowVariableDeclarations)
{
Token nextToken = _source.PeekNextToken();
while (nextToken is ModifierToken)
{
_source.ReadNextToken();
_state.NextTokenModifiers.Add((ModifierToken)nextToken);
nextToken = _source.PeekNextToken();
}
if (nextToken is EndOfStreamToken)
{
throw new CompilerMessage(ErrorCode.EndOfInputReached, "The end of the script was reached in the middle of a function");
}
if ((nextToken is KeywordToken) &&
(((KeywordToken)nextToken).SymbolType == PredefinedSymbol.OpenBrace))
{
ProcessCodeBlock();
}
else if (nextToken is KeywordToken)
{
_source.ReadNextToken();
ProcessKeyword((KeywordToken)nextToken);
}
else if (nextToken.IsVariableType)
{
_source.PushLocation();
Token variableType = _source.ReadNextToken();
if (_source.NextIsKeyword(PredefinedSymbol.Dot))
{
// it's a static member access
_source.PopLocation();
GenerateCodeForExpression(ReadExpression(true, PredefinedSymbol.Semicolon));
}
else
{
_source.DeletePushedLocation();
if (!allowVariableDeclarations)
{
throw new CompilerMessage(ErrorCode.VariableDeclarationNotAllowedHere, "The variable would go out of scope as soon as it was declared");
}
do
{
DeclareLocalVariable(variableType);
}while (_source.NextIsKeyword(PredefinedSymbol.Comma));
_source.ExpectKeyword(PredefinedSymbol.Semicolon);
_state.NextTokenModifiers.Clear();
}
}
else
{
GenerateCodeForExpression(ReadExpression(true, PredefinedSymbol.Semicolon));
}
}