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added parsing for signed integers and floats

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This commit is contained in:
Marc Zinnschlag 2010-06-29 12:05:22 +02:00
parent ab33234027
commit ca8002e533
7 changed files with 126 additions and 13 deletions
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70
components/compiler/exprparser.cpp
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@ -9,6 +9,36 @@
namespace Compiler
{
char ExprParser::popUnaryOperator()
{
if (mOperators.empty())
return 0;
char op = mOperators[mOperators.size()-1];
if (op!='m') // unary -
return 0;
mOperators.resize (mOperators.size()-1);
return op;
}
char ExprParser::popOperand (std::vector<Interpreter::Type_Code>& code)
{
Operand operand = mOperands[mOperands.size()-1];
mOperands.resize (mOperands.size()-1);
if (operand.mType=='l')
Generator::pushInt (code, mLiterals, operand.mInteger);
else if (operand.mType=='f')
Generator::pushFloat (code, mLiterals, operand.mFloat);
else
throw std::logic_error ("unknown expression type");
return operand.mType;
}
ExprParser::ExprParser (ErrorHandler& errorHandler, Context& context, Locals& locals,
Literals& literals)
: Parser (errorHandler, context), mLocals (locals), mLiterals (literals),
@ -18,7 +48,7 @@ namespace Compiler
bool ExprParser::parseInt (int value, const TokenLoc& loc, Scanner& scanner)
{
if (mNextOperand)
{
{
Operand operand;
operand.mType = 'l';
operand.mInteger = value;
@ -79,6 +109,17 @@ namespace Compiler
return false;
}
if (code==Scanner::S_minus)
{
if (mNextOperand)
{
// unary
mOperators.push_back ('m');
mTokenLoc = loc;
return true;
}
}
return Parser::parseSpecial (code, loc, scanner);
}
@ -97,17 +138,24 @@ namespace Compiler
if (mNextOperand)
getErrorHandler().error ("syntax error in expression", mTokenLoc);
Operand operand = mOperands[mOperands.size()-1];
mOperands.clear();
char type = ' ';
while (!mOperands.empty())
{
type = popOperand (code);
while (char op = popUnaryOperator())
{
if (op=='m')
{
Generator::negate (code, type);
}
else
throw std::logic_error ("unknown unary operator");
}
}
if (operand.mType=='l')
Generator::pushInt (code, mLiterals, operand.mInteger);
else if (operand.mType=='f')
Generator::pushFloat (code, mLiterals, operand.mFloat);
else
throw std::logic_error ("unknown expression type");
return operand.mType;
return type;
}
}