openmw/components/compiler/scriptparser.cpp

#include "scriptparser.hpp"

#include "errorhandler.hpp"
#include "scanner.hpp"
#include "skipparser.hpp"

namespace Compiler
{
    ScriptParser::ScriptParser(ErrorHandler& errorHandler, const Context& context, Locals& locals, bool end)
        : Parser(errorHandler, context)
        , mOutput(locals)
        , mLineParser(errorHandler, context, locals, mOutput.getLiterals(), mOutput.getCode())
        , mControlParser(errorHandler, context, locals, mOutput.getLiterals())
        , mEnd(end)
    {
    }

    Interpreter::Program ScriptParser::getProgram() const
    {
        return mOutput.getProgram();
    }

    bool ScriptParser::parseName(const std::string& name, const TokenLoc& loc, Scanner& scanner)
    {
        mLineParser.reset();
        if (mLineParser.parseName(name, loc, scanner))
            scanner.scan(mLineParser);

        return true;
    }

    bool ScriptParser::parseKeyword(int keyword, const TokenLoc& loc, Scanner& scanner)
    {
        if (keyword == Scanner::K_while || keyword == Scanner::K_if || keyword == Scanner::K_elseif)
        {
            mControlParser.reset();
            if (mControlParser.parseKeyword(keyword, loc, scanner))
                scanner.scan(mControlParser);

            mControlParser.appendCode(mOutput.getCode());

            return true;
        }

        /// \todo add an option to disable this nonsense
        if (keyword == Scanner::K_endif)
        {
            // surplus endif
            getErrorHandler().warning("endif without matching if/elseif", loc);

            SkipParser skip(getErrorHandler(), getContext());
            scanner.scan(skip);
            return true;
        }

        if (keyword == Scanner::K_end && mEnd)
        {
            return false;
        }

        mLineParser.reset();
        if (mLineParser.parseKeyword(keyword, loc, scanner))
            scanner.scan(mLineParser);

        return true;
    }

    bool ScriptParser::parseSpecial(int code, const TokenLoc& loc, Scanner& scanner)
    {
        if (code == Scanner::S_newline) // empty line
            return true;

        if (code == Scanner::S_open) /// \todo Option to switch this off
        {
            scanner.putbackSpecial(code, loc);
            return parseKeyword(Scanner::K_if, loc, scanner);
        }

        mLineParser.reset();
        if (mLineParser.parseSpecial(code, loc, scanner))
            scanner.scan(mLineParser);

        return true;
    }

    void ScriptParser::parseEOF(Scanner& scanner)
    {
        if (mEnd)
            Parser::parseEOF(scanner);
    }

    void ScriptParser::reset()
    {
        mLineParser.reset();
        mOutput.clear();
    }
}