mirror of
https://github.com/OpenMW/openmw.git
synced 2025-11-04 12:26:39 +00:00
855 lines
23 KiB
C++
855 lines
23 KiB
C++
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#include "exprparser.hpp"
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#include <stdexcept>
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#include <cassert>
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#include <algorithm>
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#include <stack>
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#include <iterator>
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#include <components/misc/stringops.hpp>
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#include "generator.hpp"
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#include "scanner.hpp"
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#include "errorhandler.hpp"
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#include "locals.hpp"
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#include "stringparser.hpp"
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#include "extensions.hpp"
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#include "context.hpp"
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#include "discardparser.hpp"
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namespace Compiler
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{
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int ExprParser::getPriority (char op) const
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{
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switch (op)
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{
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case '(':
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return 0;
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case 'e': // ==
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case 'n': // !=
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case 'l': // <
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case 'L': // <=
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case 'g': // <
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case 'G': // >=
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return 1;
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case '+':
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case '-':
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return 2;
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case '*':
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case '/':
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return 3;
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case 'm':
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return 4;
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}
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return 0;
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}
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char ExprParser::getOperandType (int Index) const
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{
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assert (!mOperands.empty());
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assert (Index>=0);
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assert (Index<static_cast<int> (mOperands.size()));
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return mOperands[mOperands.size()-1-Index];
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}
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char ExprParser::getOperator() const
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{
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assert (!mOperators.empty());
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return mOperators[mOperators.size()-1];
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}
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bool ExprParser::isOpen() const
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{
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return std::find (mOperators.begin(), mOperators.end(), '(')!=mOperators.end();
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}
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void ExprParser::popOperator()
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{
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assert (!mOperators.empty());
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mOperators.resize (mOperators.size()-1);
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}
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void ExprParser::popOperand()
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{
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assert (!mOperands.empty());
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mOperands.resize (mOperands.size()-1);
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}
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void ExprParser::replaceBinaryOperands()
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{
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char t1 = getOperandType (1);
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char t2 = getOperandType();
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popOperand();
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popOperand();
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if (t1==t2)
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mOperands.push_back (t1);
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else if (t1=='f' || t2=='f')
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mOperands.push_back ('f');
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else
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throw std::logic_error ("failed to determine result operand type");
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}
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void ExprParser::pop()
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{
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char op = getOperator();
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switch (op)
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{
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case 'm':
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Generator::negate (mCode, getOperandType());
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popOperator();
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break;
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case '+':
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Generator::add (mCode, getOperandType (1), getOperandType());
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popOperator();
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replaceBinaryOperands();
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break;
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case '-':
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Generator::sub (mCode, getOperandType (1), getOperandType());
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popOperator();
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replaceBinaryOperands();
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break;
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case '*':
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Generator::mul (mCode, getOperandType (1), getOperandType());
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popOperator();
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replaceBinaryOperands();
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break;
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case '/':
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Generator::div (mCode, getOperandType (1), getOperandType());
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popOperator();
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replaceBinaryOperands();
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break;
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case 'e':
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case 'n':
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case 'l':
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case 'L':
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case 'g':
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case 'G':
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Generator::compare (mCode, op, getOperandType (1), getOperandType());
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popOperator();
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popOperand();
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popOperand();
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mOperands.push_back ('l');
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break;
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default:
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throw std::logic_error ("unknown operator");
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}
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}
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void ExprParser::pushIntegerLiteral (int value)
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{
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mNextOperand = false;
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mOperands.push_back ('l');
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Generator::pushInt (mCode, mLiterals, value);
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}
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void ExprParser::pushFloatLiteral (float value)
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{
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mNextOperand = false;
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mOperands.push_back ('f');
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Generator::pushFloat (mCode, mLiterals, value);
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}
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void ExprParser::pushBinaryOperator (char c)
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{
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while (!mOperators.empty() && getPriority (getOperator())>=getPriority (c))
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pop();
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mOperators.push_back (c);
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mNextOperand = true;
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}
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void ExprParser::close()
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{
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while (getOperator()!='(')
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pop();
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popOperator();
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}
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int ExprParser::parseArguments (const std::string& arguments, Scanner& scanner)
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{
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return parseArguments (arguments, scanner, mCode);
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}
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bool ExprParser::handleMemberAccess (const std::string& name)
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{
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mMemberOp = false;
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std::string name2 = Misc::StringUtils::lowerCase (name);
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std::string id = Misc::StringUtils::lowerCase (mExplicit);
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std::pair<char, bool> type = getContext().getMemberType (name2, id);
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if (type.first!=' ')
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{
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Generator::fetchMember (mCode, mLiterals, type.first, name2, id, !type.second);
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mNextOperand = false;
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mExplicit.clear();
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mOperands.push_back (type.first=='f' ? 'f' : 'l');
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return true;
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}
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return false;
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}
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ExprParser::ExprParser (ErrorHandler& errorHandler, const Context& context, Locals& locals,
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Literals& literals, bool argument)
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: Parser (errorHandler, context), mLocals (locals), mLiterals (literals),
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mNextOperand (true), mFirst (true), mArgument (argument), mRefOp (false), mMemberOp (false)
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{}
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bool ExprParser::parseInt (int value, const TokenLoc& loc, Scanner& scanner)
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{
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if (!mExplicit.empty())
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return Parser::parseInt (value, loc, scanner);
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mFirst = false;
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if (mNextOperand)
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{
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start();
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pushIntegerLiteral (value);
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mTokenLoc = loc;
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return true;
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}
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else
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{
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// no comma was used between arguments
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scanner.putbackInt (value, loc);
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return false;
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}
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}
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bool ExprParser::parseFloat (float value, const TokenLoc& loc, Scanner& scanner)
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{
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if (!mExplicit.empty())
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return Parser::parseFloat (value, loc, scanner);
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mFirst = false;
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if (mNextOperand)
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{
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start();
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pushFloatLiteral (value);
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mTokenLoc = loc;
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return true;
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}
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else
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{
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// no comma was used between arguments
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scanner.putbackFloat (value, loc);
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return false;
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}
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}
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bool ExprParser::parseName (const std::string& name, const TokenLoc& loc,
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Scanner& scanner)
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{
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if (!mExplicit.empty())
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{
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if (mMemberOp && handleMemberAccess (name))
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return true;
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return Parser::parseName (name, loc, scanner);
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}
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mFirst = false;
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if (mNextOperand)
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{
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start();
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std::string name2 = Misc::StringUtils::lowerCase (name);
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char type = mLocals.getType (name2);
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if (type!=' ')
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{
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Generator::fetchLocal (mCode, type, mLocals.getIndex (name2));
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mNextOperand = false;
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mOperands.push_back (type=='f' ? 'f' : 'l');
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return true;
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}
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type = getContext().getGlobalType (name2);
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if (type!=' ')
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{
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Generator::fetchGlobal (mCode, mLiterals, type, name2);
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mNextOperand = false;
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mOperands.push_back (type=='f' ? 'f' : 'l');
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return true;
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}
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// die in a fire, Morrowind script compiler!
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if (const Extensions *extensions = getContext().getExtensions())
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{
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if (getContext().isJournalId (name2))
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{
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// JournalID used as an argument. Use the index of that JournalID
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Generator::pushString (mCode, mLiterals, name2);
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int keyword = extensions->searchKeyword ("getjournalindex");
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extensions->generateFunctionCode (keyword, mCode, mLiterals, mExplicit, 0);
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mNextOperand = false;
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mOperands.push_back ('l');
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return 2;
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}
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}
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if (mExplicit.empty() && getContext().isId (name2))
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{
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mExplicit = name2;
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return true;
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}
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}
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else
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{
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// no comma was used between arguments
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scanner.putbackName (name, loc);
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return false;
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}
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return Parser::parseName (name, loc, scanner);
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}
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bool ExprParser::parseKeyword (int keyword, const TokenLoc& loc, Scanner& scanner)
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{
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if (const Extensions *extensions = getContext().getExtensions())
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{
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std::string argumentType; // ignored
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bool hasExplicit = false; // ignored
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if (extensions->isInstruction (keyword, argumentType, hasExplicit))
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{
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// pretend this is not a keyword
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return parseName (loc.mLiteral, loc, scanner);
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}
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}
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if (keyword==Scanner::K_end || keyword==Scanner::K_begin ||
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keyword==Scanner::K_short || keyword==Scanner::K_long ||
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keyword==Scanner::K_float || keyword==Scanner::K_if ||
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keyword==Scanner::K_endif || keyword==Scanner::K_else ||
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keyword==Scanner::K_elseif || keyword==Scanner::K_while ||
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keyword==Scanner::K_endwhile || keyword==Scanner::K_return ||
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keyword==Scanner::K_messagebox || keyword==Scanner::K_set ||
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keyword==Scanner::K_to || keyword==Scanner::K_startscript ||
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keyword==Scanner::K_stopscript || keyword==Scanner::K_enable ||
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keyword==Scanner::K_disable)
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{
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return parseName (loc.mLiteral, loc, scanner);
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}
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mFirst = false;
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if (!mExplicit.empty())
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{
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if (mRefOp && mNextOperand)
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{
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if (keyword==Scanner::K_getdisabled)
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{
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start();
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mTokenLoc = loc;
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Generator::getDisabled (mCode, mLiterals, mExplicit);
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mOperands.push_back ('l');
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mExplicit.clear();
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mRefOp = false;
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std::vector<Interpreter::Type_Code> ignore;
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parseArguments ("x", scanner, ignore);
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_getdistance)
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{
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start();
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mTokenLoc = loc;
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parseArguments ("c", scanner);
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Generator::getDistance (mCode, mLiterals, mExplicit);
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mOperands.push_back ('f');
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mExplicit.clear();
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mRefOp = false;
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_scriptrunning)
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{
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start();
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mTokenLoc = loc;
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parseArguments ("c", scanner);
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Generator::scriptRunning (mCode);
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mOperands.push_back ('l');
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mExplicit.clear();
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mRefOp = false;
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mNextOperand = false;
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return true;
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}
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// check for custom extensions
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if (const Extensions *extensions = getContext().getExtensions())
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{
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char returnType;
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std::string argumentType;
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bool hasExplicit = true;
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if (extensions->isFunction (keyword, returnType, argumentType, hasExplicit))
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{
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if (!hasExplicit)
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{
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getErrorHandler().warning ("stray explicit reference (ignoring it)", loc);
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mExplicit.clear();
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}
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start();
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mTokenLoc = loc;
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int optionals = parseArguments (argumentType, scanner);
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extensions->generateFunctionCode (keyword, mCode, mLiterals, mExplicit,
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optionals);
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mOperands.push_back (returnType);
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mExplicit.clear();
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mRefOp = false;
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mNextOperand = false;
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return true;
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}
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}
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}
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return Parser::parseKeyword (keyword, loc, scanner);
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}
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if (mNextOperand)
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{
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if (keyword==Scanner::K_getsquareroot)
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{
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start();
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mTokenLoc = loc;
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parseArguments ("f", scanner);
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Generator::squareRoot (mCode);
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mOperands.push_back ('f');
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_menumode)
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{
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start();
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mTokenLoc = loc;
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Generator::menuMode (mCode);
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mOperands.push_back ('l');
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_random)
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{
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start();
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mTokenLoc = loc;
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parseArguments ("l", scanner);
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Generator::random (mCode);
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mOperands.push_back ('l');
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_scriptrunning)
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{
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start();
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mTokenLoc = loc;
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parseArguments ("c", scanner);
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Generator::scriptRunning (mCode);
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mOperands.push_back ('l');
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_getdistance)
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{
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start();
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mTokenLoc = loc;
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parseArguments ("c", scanner);
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Generator::getDistance (mCode, mLiterals, "");
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mOperands.push_back ('f');
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_getsecondspassed)
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{
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start();
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mTokenLoc = loc;
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Generator::getSecondsPassed (mCode);
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mOperands.push_back ('f');
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mNextOperand = false;
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return true;
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}
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else if (keyword==Scanner::K_getdisabled)
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{
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start();
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mTokenLoc = loc;
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Generator::getDisabled (mCode, mLiterals, "");
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mOperands.push_back ('l');
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std::vector<Interpreter::Type_Code> ignore;
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parseArguments ("x", scanner, ignore);
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mNextOperand = false;
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return true;
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}
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else
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{
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// check for custom extensions
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if (const Extensions *extensions = getContext().getExtensions())
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{
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start();
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char returnType;
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std::string argumentType;
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bool hasExplicit = false;
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if (extensions->isFunction (keyword, returnType, argumentType, hasExplicit))
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{
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mTokenLoc = loc;
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int optionals = parseArguments (argumentType, scanner);
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extensions->generateFunctionCode (keyword, mCode, mLiterals, "", optionals);
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mOperands.push_back (returnType);
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mNextOperand = false;
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return true;
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}
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}
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}
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}
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else
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{
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// no comma was used between arguments
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scanner.putbackKeyword (keyword, loc);
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return false;
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}
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return Parser::parseKeyword (keyword, loc, scanner);
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}
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bool ExprParser::parseSpecial (int code, const TokenLoc& loc, Scanner& scanner)
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{
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if (!mExplicit.empty())
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{
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if (mRefOp && code==Scanner::S_open)
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{
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/// \todo add option to disable this workaround
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mOperators.push_back ('(');
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mTokenLoc = loc;
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return true;
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}
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if (!mRefOp && code==Scanner::S_ref)
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{
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mRefOp = true;
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return true;
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}
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if (!mMemberOp && code==Scanner::S_member)
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{
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mMemberOp = true;
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return true;
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}
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return Parser::parseSpecial (code, loc, scanner);
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}
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if (code==Scanner::S_comma)
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{
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mTokenLoc = loc;
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if (mFirst)
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{
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// leading comma
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mFirst = false;
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return true;
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}
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// end marker
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scanner.putbackSpecial (code, loc);
|
|
return false;
|
|
}
|
|
|
|
mFirst = false;
|
|
|
|
if (code==Scanner::S_newline)
|
|
{
|
|
// end marker
|
|
mTokenLoc = loc;
|
|
scanner.putbackSpecial (code, loc);
|
|
return false;
|
|
}
|
|
|
|
if (code==Scanner::S_minus && mNextOperand)
|
|
{
|
|
// unary
|
|
mOperators.push_back ('m');
|
|
mTokenLoc = loc;
|
|
return true;
|
|
}
|
|
|
|
if (code==Scanner::S_open)
|
|
{
|
|
if (mNextOperand)
|
|
{
|
|
mOperators.push_back ('(');
|
|
mTokenLoc = loc;
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
// no comma was used between arguments
|
|
scanner.putbackKeyword (code, loc);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (code==Scanner::S_close && !mNextOperand)
|
|
{
|
|
if (isOpen())
|
|
{
|
|
close();
|
|
return true;
|
|
}
|
|
|
|
mTokenLoc = loc;
|
|
scanner.putbackSpecial (code, loc);
|
|
return false;
|
|
}
|
|
|
|
if (!mNextOperand)
|
|
{
|
|
mTokenLoc = loc;
|
|
char c = 0; // comparison
|
|
|
|
switch (code)
|
|
{
|
|
case Scanner::S_plus: c = '+'; break;
|
|
case Scanner::S_minus: c = '-'; break;
|
|
case Scanner::S_mult: pushBinaryOperator ('*'); return true;
|
|
case Scanner::S_div: pushBinaryOperator ('/'); return true;
|
|
case Scanner::S_cmpEQ: c = 'e'; break;
|
|
case Scanner::S_cmpNE: c = 'n'; break;
|
|
case Scanner::S_cmpLT: c = 'l'; break;
|
|
case Scanner::S_cmpLE: c = 'L'; break;
|
|
case Scanner::S_cmpGT: c = 'g'; break;
|
|
case Scanner::S_cmpGE: c = 'G'; break;
|
|
}
|
|
|
|
if (c)
|
|
{
|
|
if (mArgument && !isOpen())
|
|
{
|
|
// expression ends here
|
|
// Thank you Morrowind for this rotten syntax :(
|
|
scanner.putbackSpecial (code, loc);
|
|
return false;
|
|
}
|
|
|
|
pushBinaryOperator (c);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return Parser::parseSpecial (code, loc, scanner);
|
|
}
|
|
|
|
void ExprParser::reset()
|
|
{
|
|
mOperands.clear();
|
|
mOperators.clear();
|
|
mNextOperand = true;
|
|
mCode.clear();
|
|
mFirst = true;
|
|
mExplicit.clear();
|
|
mRefOp = false;
|
|
mMemberOp = false;
|
|
Parser::reset();
|
|
}
|
|
|
|
char ExprParser::append (std::vector<Interpreter::Type_Code>& code)
|
|
{
|
|
if (mOperands.empty() && mOperators.empty())
|
|
{
|
|
getErrorHandler().error ("missing expression", mTokenLoc);
|
|
return 'l';
|
|
}
|
|
|
|
if (mNextOperand || mOperands.empty())
|
|
{
|
|
getErrorHandler().error ("syntax error in expression", mTokenLoc);
|
|
return 'l';
|
|
}
|
|
|
|
while (!mOperators.empty())
|
|
pop();
|
|
|
|
std::copy (mCode.begin(), mCode.end(), std::back_inserter (code));
|
|
|
|
assert (mOperands.size()==1);
|
|
return mOperands[0];
|
|
}
|
|
|
|
int ExprParser::parseArguments (const std::string& arguments, Scanner& scanner,
|
|
std::vector<Interpreter::Type_Code>& code)
|
|
{
|
|
bool optional = false;
|
|
int optionalCount = 0;
|
|
|
|
ExprParser parser (getErrorHandler(), getContext(), mLocals, mLiterals, true);
|
|
StringParser stringParser (getErrorHandler(), getContext(), mLiterals);
|
|
DiscardParser discardParser (getErrorHandler(), getContext());
|
|
|
|
std::stack<std::vector<Interpreter::Type_Code> > stack;
|
|
|
|
for (std::string::const_iterator iter (arguments.begin()); iter!=arguments.end();
|
|
++iter)
|
|
{
|
|
if (*iter=='/')
|
|
{
|
|
optional = true;
|
|
}
|
|
else if (*iter=='S' || *iter=='c' || *iter=='x')
|
|
{
|
|
stringParser.reset();
|
|
|
|
if (optional || *iter=='x')
|
|
stringParser.setOptional (true);
|
|
|
|
if (*iter=='c') stringParser.smashCase();
|
|
scanner.scan (stringParser);
|
|
|
|
if (optional && stringParser.isEmpty())
|
|
break;
|
|
|
|
if (*iter!='x')
|
|
{
|
|
std::vector<Interpreter::Type_Code> tmp;
|
|
stringParser.append (tmp);
|
|
|
|
stack.push (tmp);
|
|
|
|
if (optional)
|
|
++optionalCount;
|
|
}
|
|
}
|
|
else if (*iter=='X')
|
|
{
|
|
parser.reset();
|
|
|
|
parser.setOptional (true);
|
|
|
|
scanner.scan (parser);
|
|
|
|
if (parser.isEmpty())
|
|
break;
|
|
}
|
|
else if (*iter=='z')
|
|
{
|
|
discardParser.reset();
|
|
discardParser.setOptional (true);
|
|
|
|
scanner.scan (discardParser);
|
|
|
|
if (discardParser.isEmpty())
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
parser.reset();
|
|
|
|
if (optional)
|
|
parser.setOptional (true);
|
|
|
|
scanner.scan (parser);
|
|
|
|
if (optional && parser.isEmpty())
|
|
break;
|
|
|
|
std::vector<Interpreter::Type_Code> tmp;
|
|
|
|
char type = parser.append (tmp);
|
|
|
|
if (type!=*iter)
|
|
Generator::convert (tmp, type, *iter);
|
|
|
|
stack.push (tmp);
|
|
|
|
if (optional)
|
|
++optionalCount;
|
|
}
|
|
}
|
|
|
|
while (!stack.empty())
|
|
{
|
|
std::vector<Interpreter::Type_Code>& tmp = stack.top();
|
|
|
|
std::copy (tmp.begin(), tmp.end(), std::back_inserter (code));
|
|
|
|
stack.pop();
|
|
}
|
|
|
|
return optionalCount;
|
|
}
|
|
}
|