private bool ParseAndAddGlobalVariableOrFunction(Token variableType)
{
bool isMemberFunctionBody = false;
_source.IgnoreAsteriskIfPresent();
FixedOffsetVariable importedVersion = null;
Token variableName = _source.ReadNextToken();
if ((variableName.Type == TokenType.GlobalVariable) &&
(variableName.Variable.IsImported) &&
(!variableName.Variable.IsAccessed))
{
importedVersion = variableName.Variable;
}
else
{
ReadNameOfNewGlobalVariableOrFunction(variableName, out isMemberFunctionBody);
}
if (_source.NextIsKeyword(PredefinedSymbol.OpenParenthesis))
{
ParseAndAddFunctionDefinition(variableType, variableName, isMemberFunctionBody);
return(true);
}
else
{
CompilerUtils.SetArrayPropertiesOnTokenFromStream(_source, variableName);
ParseAndAddGlobalVariableDefinition(variableType, variableName, importedVersion);
}
return(false);
}
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 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 void DeclareLocalVariable(Token variableType)
{
_source.IgnoreAsteriskIfPresent();
Token variableName = _source.ReadNextTokenAndThrowIfAlreadyDefined();
CompilerUtils.SetArrayPropertiesOnTokenFromStream(_source, variableName);
CompilerUtils.VerifyModifiersAgainstType(ModifierTargets.LocalVariable, _state.NextTokenModifiers);
/* TODO: get this working
* ScriptVariable newVariable = ProcessVariableDeclaration(variableType, _output.GlobalData, null, _state.NextTokenModifiers);
*
* variableName.Define(TokenType.LocalVariable, newVariable); */
if (_source.NextIsKeyword(PredefinedSymbol.SetEqual))
{
Expression setEqualTo = ReadExpression(false, PredefinedSymbol.Semicolon, PredefinedSymbol.Comma);
// TODO: check types, assign result to variable
}
}
private void ParseAndAddMemberToStruct(Token variableType, Token structName, ScriptStruct structDefinition, Token parentStruct)
{
_source.IgnoreAsteriskIfPresent();
Token memberName = _source.ReadNextToken();
if ((memberName is KeywordToken) || (memberName is OperatorToken) ||
(memberName is ModifierToken))
{
throw new CompilerMessage(ErrorCode.TokenAlreadyDefined, "Cannot use '" + memberName.Name + "' as variable name since it has another meaning");
}
string mangledName;
memberName = GetTokenForStructMember(structName, memberName, out mangledName);
if (memberName != null)
{
throw new CompilerMessage(ErrorCode.TokenAlreadyDefined, "Member '" + mangledName + "' already exists");
}
memberName = new Token(mangledName, true);
// TODO: Set necessary fields on new token for this struct member
_tokenizedScript.AddToken(memberName);
CompilerUtils.SetArrayPropertiesOnTokenFromStream(_source, memberName);
if (_source.NextIsKeyword(PredefinedSymbol.OpenParenthesis))
{
VerifyModifiersAgainstType(ModifierTargets.MemberFunction);
VerifyReturnTypeValidForFunction(variableType);
ScriptFunction func = new ScriptFunction(variableType, memberName);
ParseFunctionParameterList(func);
func.IsPrototypeOnly = true;
}
else
{
VerifyModifiersAgainstType(ModifierTargets.MemberVariable);
ProcessVariableDeclaration(variableType, structDefinition, parentStruct, _state.NextTokenModifiers);
}
}
private int FindIndexOfLowestPrecedenceOperator()
{
int foundIndex = -1;
int foundPrecedence = -1;
int bracketLevel = 0;
for (int i = 0; i < this.Count; i++)
{
if (CompilerUtils.AdjustBracketLevelIfTokenIsBracket(this[i], ref bracketLevel))
{
// do nothing, the bracketlevel has been changed
}
else if (bracketLevel == 0)
{
if (this[i] is OperatorToken)
{
int thisPrecedence = ((OperatorToken)this[i]).Precedence;
if (thisPrecedence > foundPrecedence)
{
foundPrecedence = thisPrecedence;
foundIndex = i;
}
}
else if (this[i] is KeywordToken)
{
if (((KeywordToken)this[i]).IsModificationOperator)
{
if (MODIFICATION_OPERATOR_PRECEDENCE > foundPrecedence)
{
foundPrecedence = MODIFICATION_OPERATOR_PRECEDENCE;
foundIndex = i;
}
}
}
}
}
return(foundIndex);
}
private Token GetTokenForStructMember(Token structName, Token memberName, out string mangledName)
{
return(CompilerUtils.GetTokenForStructMember(_tokenizedScript, structName, memberName, out mangledName));
}
private void VerifyModifiersAgainstType(ModifierTargets target)
{
CompilerUtils.VerifyModifiersAgainstType(target, _state.NextTokenModifiers);
}
