Retro68/Rez/Expression.cc
Wolfgang Thaller 399131a8a6 Rez: switch
2014-10-08 01:17:17 +02:00

134 lines
2.4 KiB
C++

#include "Expression.h"
#include "ResourceCompiler.h"
#include <cassert>
#include <iostream>
int Expression::evaluateInt(ResourceCompiler *ctx)
{
throw TypeError();
}
Expression::~Expression()
{
}
StringExpr::~StringExpr()
{
}
IntExpr::~IntExpr()
{
}
int IntExpr::evaluateInt(ResourceCompiler *ctx)
{
return val;
}
void CompoundExpr::addItem(ExprPtr item)
{
items.push_back(item);
}
CompoundExpr::~CompoundExpr()
{
}
BinaryExpr::~BinaryExpr()
{
}
int BinaryExpr::evaluateInt(ResourceCompiler *ctx)
{
switch(op)
{
case BinaryOp::XOR:
return a->evaluateInt(ctx) ^ b->evaluateInt(ctx);
case BinaryOp::OR:
return a->evaluateInt(ctx) | b->evaluateInt(ctx);
case BinaryOp::AND:
return a->evaluateInt(ctx) & b->evaluateInt(ctx);
case BinaryOp::SHIFTLEFT:
return a->evaluateInt(ctx) << b->evaluateInt(ctx);
case BinaryOp::SHIFTRIGHT:
return a->evaluateInt(ctx) >> b->evaluateInt(ctx);
case BinaryOp::EQUAL:
return a->evaluateInt(ctx) == b->evaluateInt(ctx);
case BinaryOp::NOTEQUAL:
return a->evaluateInt(ctx) != b->evaluateInt(ctx);
case BinaryOp::PLUS:
return a->evaluateInt(ctx) + b->evaluateInt(ctx);
case BinaryOp::MINUS:
return a->evaluateInt(ctx) - b->evaluateInt(ctx);
case BinaryOp::MULTIPLY:
return a->evaluateInt(ctx) * b->evaluateInt(ctx);
case BinaryOp::DIVIDE:
return a->evaluateInt(ctx) / b->evaluateInt(ctx);
}
}
UnaryExpr::~UnaryExpr()
{
}
int UnaryExpr::evaluateInt(ResourceCompiler *ctx)
{
switch(op)
{
case UnaryOp::MINUS:
return -a->evaluateInt(ctx);
case UnaryOp::COMPLEMENT:
return ~a->evaluateInt(ctx);
}
}
IdentifierExpr::IdentifierExpr(std::string id, bool isFunction)
: id(id), isFunction(isFunction)
{
}
void IdentifierExpr::addArgument(ExprPtr e)
{
arguments.push_back(e);
}
int IdentifierExpr::evaluateInt(ResourceCompiler *ctx)
{
if(isFunction)
{
if(id == "$$countof" || id == "$$arrayindex")
{
assert(arguments.size() == 1);
IdentifierExprPtr arr = std::dynamic_pointer_cast<IdentifierExpr>(arguments[0]);
assert(arr);
if(id == "$$countof")
return ctx->getArrayCount(arr->id);
else
return ctx->getArrayIndex(arr->id);
}
else
{
std::cout << id << std::endl;
assert(false);
}
}
else
{
ExprPtr val = ctx->lookupIdentifier(id);
assert(val);
return val->evaluateInt(ctx);
}
}
CaseExpr::CaseExpr(const std::string &tag, CompoundExprPtr expr)
: tag(tag), expr(expr)
{
}