compare.cpp

// Copyright 2014 Tony Wasserka
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
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// Enable this for detailed XML overview of parser results
// #define BOOST_SPIRIT_DEBUG

#include <boost/fusion/include/adapt_struct.hpp>
#include <boost/phoenix/core/reference.hpp>
#include <boost/spirit/include/qi.hpp>

#include "nihstro/parser_assembly.h"
#include "nihstro/parser_assembly_private.h"

#include "nihstro/shader_binary.h"
#include "nihstro/shader_bytecode.h"

namespace spirit = boost::spirit;
namespace qi = boost::spirit::qi;
namespace ascii = boost::spirit::qi::ascii;
namespace phoenix = boost::phoenix;

using spirit::_1;
using spirit::_2;
using spirit::_3;
using spirit::_4;

using namespace nihstro;

// Adapt parser data structures for use with boost::spirit

/*BOOST_FUSION_ADAPT_STRUCT(
 IntegerWithSign,
 (int, sign)
 (unsigned, value)
 )
 */
BOOST_FUSION_ADAPT_STRUCT(
                          CompareInstruction,
                          (OpCode, opcode)
                          (std::vector<Expression>, arguments)
                          (std::vector<Instruction::Common::CompareOpType::Op>, ops)
                          )

template<>
CompareParser<ParserIterator>::CompareParser(const ParserContext& context)
: CompareParser::base_type(instruction),
common(context),
opcodes_compare(common.opcodes_compare),
expression(common.expression),
end_of_statement(common.end_of_statement),
diagnostics(common.diagnostics) {
    
    // TODO: Will this properly match >= ?
    compare_ops.add
    ( "==", CompareOp::Equal )
    ( "!=", CompareOp::NotEqual )
    ( "<", CompareOp::LessThan )
    ( "<=", CompareOp::LessEqual )
    ( ">", CompareOp::GreaterThan )
    ( ">=", CompareOp::GreaterEqual );
    
    // Setup rules
    
    auto comma_rule = qi::lit(',');
    
    opcode = qi::no_case[qi::lexeme[opcodes_compare >> &ascii::space]];
    compare_op = qi::lexeme[compare_ops];
    
    // cmp src1, src2, op1, op2
    // TODO: Also allow "cmp src1 op1 src2, src1 op2 src2"
    two_ops = compare_op > comma_rule > compare_op;
    two_expressions = expression > comma_rule > expression;
    instr[0] = opcode > two_expressions > comma_rule > two_ops;
    
    instruction = instr[0] > end_of_statement;
    
    // Error handling
    // BOOST_SPIRIT_DEBUG_NODE(instr[0]);
    // BOOST_SPIRIT_DEBUG_NODE(instruction);
    
    // qi::on_error<qi::fail>(instruction, error_handler(phoenix::ref(diagnostics), _1, _2, _3, _4));
}