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syntax.cpp
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#include "syntax.h"
SyntaxParse::SyntaxParse(std::string &file_path, Output *output, MidCode *midCode) {
this->output = output;
this->midCode = midCode;
this->symbolTable = new SymbolTable();
this->errorHandler = new ErrorHandler(this->symbolTable, this->output);
this->tokenParse = new TokenParse(file_path, this->errorHandler);
}
SyntaxParse::~SyntaxParse() {
}
void SyntaxParse::checkSyntax() {
getSym();
program();
}
Symbol SyntaxParse::getPreSym(int id) {
int size = this->preTokens.size();
if (size < id) {
for (int i = 0; i < id - size; i++) {
this->preTokens.push_back(this->tokenParse->getToken());
}
}
return this->preTokens[id - 1].sym;
}
void SyntaxParse::getSym() {
if (this->preTokens.empty()) {
this->token = this->tokenParse->getToken();
this->sym = this->token.sym;
} else {
this->token = this->preTokens.front();
this->preTokens.erase(this->preTokens.begin());
this->sym = this->token.sym;
}
this->output->outSyntax(this->token.symbol + " " + this->token.tok);
}
void SyntaxParse::restract() {
this->preTokens.insert(this->preTokens.begin(), this->token);
}
void SyntaxParse::program() {
if (this->sym == CONSTTK) {
constDeclare();
getSym();
}
if ((this->sym == INTTK || this->sym == CHARTK) && getPreSym(1) == IDENFR && getPreSym(2) != LPARENT) {
variableDeclare();
getSym();
}
if ((this->sym == INTTK || this->sym == CHARTK) || (this->sym == VOIDTK && getPreSym(1) == IDENFR)) {
while ((this->sym == INTTK || this->sym == CHARTK) || (this->sym == VOIDTK && getPreSym(1) == IDENFR)) {
if (this->sym == INTTK || this->sym == CHARTK) {
returnedFuncDefine();
getSym();
} else {
unreturnedFuncDefine();
getSym();
}
}
}
mainFunc();
this->output->outSyntax("<程序>");
}
void SyntaxParse::mainFunc() {
this->funcType = UNRETURNEDFUNC;
// void
getSym();
// main
std::string func = this->token.tok;
std::string label = this->token.tok;
std::vector<std::string> params;
std::vector<SyntaxType> paramsType;
this->midCode->geneFuncDefMidCode(func, params, paramsType);
this->midCode->geneLabelMidCode(label);
getSym();
// (
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
getSym();
// {
this->symbolTable->addScope();
if (getPreSym(1) == RBRACE)
this->sym = NON;
else
getSym();
compoundStatement();
getSym();
// }
this->symbolTable->decreaseScope();
this->output->outSyntax("<主函数>");
}
bool SyntaxParse::unsignedInt() {
bool isUnsignedInt = true;
if (this->sym != INTCON) {
isUnsignedInt = false;
}
this->output->outSyntax("<无符号整数>");
return isUnsignedInt;
}
bool SyntaxParse::intcon() {
bool isIntCon;
bool isMinu = false;
if (this->sym == PLUS || this->sym == MINU) {
if (this->sym == MINU)
isMinu = true;
getSym();
}
isIntCon = unsignedInt();
if (isIntCon) {
this->conVal = this->token.tok;
if (isMinu)
this->conVal = "-" + this->conVal;
}
this->output->outSyntax("<整数>");
return isIntCon;
}
bool SyntaxParse::strcon() {
bool isStrCon = true;
if (this->sym != STRCON) {
isStrCon = false;
}
this->output->outSyntax("<字符串>");
return isStrCon;
}
void SyntaxParse::declareHeader() {
// int or char
getSym();
// identifier
this->output->outSyntax("<声明头部>");
}
void SyntaxParse::constDeclare() {
// const
getSym();
constDefine();
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
while (getPreSym(1) == CONSTTK) {
getSym();
// const
getSym();
constDefine();
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
}
this->output->outSyntax("<常量说明>");
}
void SyntaxParse::constDefine() {
if (this->sym == INTTK) {
getSym();
// identifier
this->errorHandler->identifierDupError(this->token.tok, CONSTINT);
// cur identifier name
std::string var = this->token.tok;
getSym();
// =
getSym();
bool isIntCon = intcon();
if (!isIntCon) {
this->errorHandler->constDefineError();
} else {
this->midCode->geneConDefMidCode(CONSTINT, var, this->conVal);
}
while (getPreSym(1) == COMMA) {
getSym();
// ,
getSym();
// identifier
this->errorHandler->identifierDupError(this->token.tok, CONSTINT);
var = this->token.tok;
getSym();
// =
getSym();
isIntCon = intcon();
if (!isIntCon) {
this->errorHandler->constDefineError();
} else {
this->midCode->geneConDefMidCode(CONSTINT, var, this->conVal);
}
}
} else if (this->sym == CHARTK) {
getSym();
// identifier
this->errorHandler->identifierDupError(this->token.tok, CONSTCHAR);
std::string var = this->token.tok;
getSym();
// =
getSym();
if (this->sym != CHARCON)
this->errorHandler->constDefineError();
else {
this->conVal = "'" + this->token.tok + "'";
this->midCode->geneConDefMidCode(CONSTCHAR, var, this->conVal);
}
while (getPreSym(1) == COMMA) {
getSym();
// ,
getSym();
// identifier
this->errorHandler->identifierDupError(this->token.tok, CONSTCHAR);
var = this->token.tok;
getSym();
// =
getSym();
if (this->sym != CHARCON)
this->errorHandler->constDefineError();
else {
this->conVal = "'" + this->token.tok + "'";
this->midCode->geneConDefMidCode(CONSTCHAR, var, this->conVal);
}
}
}
this->output->outSyntax("<常量定义>");
}
void SyntaxParse::variableDeclare() {
variableDefine();
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
while ((getPreSym(1) == INTTK || getPreSym(1) == CHARTK) && getPreSym(3) != LPARENT) {
getSym();
variableDefine();
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
}
this->output->outSyntax("<变量说明>");
}
void SyntaxParse::variableDefine() {
// int or char
Symbol symbol = this->sym;
getSym();
// identifier
std::string var = this->token.tok;
if (getPreSym(1) == LBRACK) {
if (symbol == INTTK)
this->errorHandler->identifierDupError(this->token.tok, INTARRAY);
else
this->errorHandler->identifierDupError(this->token.tok, CHARARRAY);
} else {
if (symbol == INTTK)
this->errorHandler->identifierDupError(this->token.tok, INT);
else
this->errorHandler->identifierDupError(this->token.tok, CHAR);
}
if (getPreSym(1) == LBRACK) {
getSym();
// [
getSym();
bool isUnsignedInt = unsignedInt();
if (!isUnsignedInt)
this->errorHandler->inValidArrayIndexError();
else {
if (symbol == INTTK)
this->midCode->geneArrayDefMidCode(INT, var, std::stoi(this->token.tok));
else
this->midCode->geneArrayDefMidCode(CHAR, var, std::stoi(this->token.tok));
}
getSym();
if (this->sym != RBRACK) {
this->errorHandler->notBracketError();
restract();
}
} else {
if (symbol == INTTK)
this->midCode->geneVarDefMidCode(INT, var);
else
this->midCode->geneVarDefMidCode(CHAR, var);
}
while (getPreSym(1) == COMMA) {
getSym();
// ,
getSym();
// identifier
var = this->token.tok;
if (getPreSym(1) == LBRACK) {
if (symbol == INTTK)
this->errorHandler->identifierDupError(this->token.tok, INT);
else
this->errorHandler->identifierDupError(this->token.tok, CHAR);
} else {
if (symbol == INTTK)
this->errorHandler->identifierDupError(this->token.tok, INT);
else
this->errorHandler->identifierDupError(this->token.tok, CHAR);
}
if (getPreSym(1) == LBRACK) {
getSym();
// [
getSym();
bool isUnsignedInt = unsignedInt();
if (!isUnsignedInt)
this->errorHandler->inValidArrayIndexError();
else {
if (symbol == INTTK)
this->midCode->geneArrayDefMidCode(INT, var, std::stoi(this->token.tok));
else
this->midCode->geneArrayDefMidCode(CHAR, var, std::stoi(this->token.tok));
}
getSym();
if (this->sym != RBRACK) {
this->errorHandler->notBracketError();
restract();
}
} else {
if (symbol == INTTK)
this->midCode->geneVarDefMidCode(INT, var);
else
this->midCode->geneVarDefMidCode(CHAR, var);
}
}
this->output->outSyntax("<变量定义>");
}
void SyntaxParse::returnedFuncDefine() {
// int or char
Symbol headerType = this->sym;
if (headerType == INTTK)
this->funcType = INTRETURNEDFUNC;
else
this->funcType = CHARRETURNFUNC;
declareHeader();
std::string func = this->token.tok;
std::string label = func;
getSym();
// (
if (getPreSym(1) == RPARENT)
this->sym = NON;
else
getSym();
std::vector<Paramter> params = parameters();
std::vector<SyntaxType> paramsType;
std::vector<std::string> paramsName;
for (Paramter ¶m: params) {
paramsName.push_back(param.identifier);
paramsType.push_back(param.syntaxType);
}
if (headerType == INTTK)
this->errorHandler->identifierDupError(func, INTRETURNEDFUNC, params);
else
this->errorHandler->identifierDupError(func, CHARRETURNFUNC, params);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
// gene func def mid code
this->midCode->geneFuncDefMidCode(func, paramsName, paramsType);
this->midCode->geneLabelMidCode(func);
getSym();
// {
this->symbolTable->addScope();
for (Paramter ¶m: params) {
this->symbolTable->push(param.identifier, param.syntaxType);
}
if (getPreSym(1) == RBRACE)
this->sym = NON;
else
getSym();
bool haveReturn = compoundStatement();
if (!haveReturn)
this->errorHandler->returnFuncError();
getSym();
// }
this->midCode->geneEndFunc();
this->symbolTable->decreaseScope();
this->output->outSyntax("<有返回值函数定义>");
}
void SyntaxParse::unreturnedFuncDefine() {
this->funcType = UNRETURNEDFUNC;
// void
getSym();
// identifier
std::string func = this->token.tok;
std::string label = func;
getSym();
// (
if (getPreSym(1) == RPARENT)
this->sym = NON;
else
getSym();
std::vector<Paramter> params = parameters();
std::vector<SyntaxType> paramsType;
std::vector<std::string> paramsName;
for (Paramter ¶m: params) {
paramsType.push_back(param.syntaxType);
paramsName.push_back(param.identifier);
}
this->errorHandler->identifierDupError(func, UNRETURNEDFUNC, params);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
this->midCode->geneFuncDefMidCode(func, paramsName, paramsType);
this->midCode->geneLabelMidCode(label);
getSym();
// {
this->symbolTable->addScope();
for (Paramter ¶m: params) {
this->symbolTable->push(param.identifier, param.syntaxType);
}
if (getPreSym(1) == RBRACE)
this->sym = NON;
else
getSym();
compoundStatement();
getSym();
// }
this->midCode->geneEndFunc();
this->symbolTable->decreaseScope();
this->output->outSyntax("<无返回值函数定义>");
}
bool SyntaxParse::statement() {
bool haveReturn = false;
if (this->sym == IFTK) {
bool hasReturn = ifStatement();
haveReturn = hasReturn || haveReturn;
} else if (this->sym == WHILETK || this->sym == FORTK || this->sym == DOTK) {
bool hasReturn = forStatement();
haveReturn = hasReturn || haveReturn;
} else if (this->sym == LBRACE) {
if (getPreSym(1) == RBRACE)
this->sym = NON;
else
getSym();
bool hasReturn = statements();
haveReturn = haveReturn || hasReturn;
getSym();
// }
} else if (this->sym == IDENFR && getPreSym(1) == LPARENT) {
std::string var;
callFuncStatement(&var);
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
} else if (this->sym == IDENFR) {
assignStatement();
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
} else if (this->sym == SCANFTK) {
scanfStatement();
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
} else if (this->sym == PRINTFTK) {
printfStatement();
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
} else if (this->sym == RETURNTK) {
bool hasReturn = returnStatement();
haveReturn = haveReturn || hasReturn;
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
} else if (this->sym == SEMICN) {
} else if (this->sym == NON) {
} else {
this->errorHandler->notSemiError();
restract();
}
this->output->outSyntax("<语句>");
return haveReturn;
}
bool SyntaxParse::compoundStatement() {
if (this->sym == CONSTTK) {
constDeclare();
if (getPreSym(1) == RBRACE)
this->sym = NON;
else
getSym();
}
if ((this->sym == INTTK || this->sym == CHARTK) && getPreSym(1) == IDENFR && getPreSym(2) != LPARENT) {
variableDeclare();
if (getPreSym(1) == RBRACE)
this->sym = NON;
else
getSym();
}
bool haveReturn = statements();
this->output->outSyntax("<复合语句>");
return haveReturn;
}
bool SyntaxParse::statements() {
Symbol symbol;
symbol = this->sym;
bool haveReturn = false;
while (symbol == IFTK || symbol == FORTK || symbol == WHILETK || symbol == DOTK || symbol == LBRACE ||
symbol == IDENFR || symbol == SCANFTK || symbol == PRINTFTK || symbol == RETURNTK || symbol == SEMICN) {
bool hasReturn = statement();
haveReturn = haveReturn || hasReturn;
if (getPreSym(1) == RBRACE)
break;
getSym();
symbol = this->sym;
}
this->output->outSyntax("<语句列>");
return haveReturn;
}
bool SyntaxParse::forStatement() {
this->midCode->resetVar();
bool haveReturn = false;
std::string label1;
std::string label2;
if (this->sym == WHILETK) {
getSym();
label1 = this->midCode->getWhileLabel();
label2 = this->midCode->getEndWhileLabel();
this->midCode->geneInitRegs();
this->midCode->geneLabelMidCode(label1);
// (
getSym();
qualification(label2, true);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
getSym();
bool hasReturn = statement();
this->midCode->geneInitRegs();
this->midCode->geneDirJumpMidCode(label1);
this->midCode->geneLabelMidCode(label2);
haveReturn = haveReturn || hasReturn;
} else if (this->sym == DOTK) {
label1 = this->midCode->getDoLabel();
label2 = this->midCode->getEndDoLabel();
this->midCode->geneInitRegs();
this->midCode->geneLabelMidCode(label1);
getSym();
bool hasReturn = statement();
haveReturn = haveReturn || hasReturn;
getSym();
if (this->sym != WHILETK) {
this->errorHandler->lackWhileError();
restract();
}
getSym();
// (
getSym();
qualification(label2, true);
this->midCode->geneDirJumpMidCode(label1);
this->midCode->geneLabelMidCode(label2);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
} else if (this->sym == FORTK) {
label1 = this->midCode->getForLabel();
label2 = this->midCode->getEndForLabel();
getSym();
// (
getSym();
// identifier
this->errorHandler->identifierNotDefError(this->token.tok);
this->errorHandler->changeConstError(this->token.tok);
std::string var = this->token.tok;
getSym();
// =
getSym();
std::string expr_var;
expression(&expr_var);
this->midCode->geneSignalVarAssignMidCode(var, expr_var, INT);
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
this->midCode->geneInitRegs();
this->midCode->geneLabelMidCode(label1);
getSym();
qualification(label2, true);
getSym();
if (this->sym != SEMICN) {
this->errorHandler->notSemiError();
restract();
}
getSym();
// identifier
var = this->token.tok;
this->errorHandler->identifierNotDefError(this->token.tok);
this->errorHandler->changeConstError(this->token.tok);
getSym();
// =
getSym();
// identifier
std::string var1 = this->token.tok;
this->errorHandler->identifierNotDefError(this->token.tok);
getSym();
// + or -
Symbol symbol = this->sym;
getSym();
std::string var2;
step(&var2);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
getSym();
bool hasReturn = statement();
if (symbol == PLUS)
this->midCode->geneExprMidCode(var, INT, var1, var2, "+");
else
this->midCode->geneExprMidCode(var, INT, var1, var2, "-");
this->midCode->geneInitRegs();
this->midCode->geneDirJumpMidCode(label1);
this->midCode->geneLabelMidCode(label2);
haveReturn = haveReturn || hasReturn;
}
this->output->outSyntax("<循环语句>");
return haveReturn;
}
void SyntaxParse::assignStatement() {
this->midCode->resetVar();
if (this->sym == IDENFR && getPreSym(1) == LBRACK) {
std::string arrVar = this->token.tok;
// identifier
this->errorHandler->identifierNotDefError(this->token.tok);
this->errorHandler->changeConstError(this->token.tok);
getSym();
// [
getSym();
std::string index_var;
bool isInt = expression(&index_var);
if (!isInt)
this->errorHandler->inValidArrayIndexError();
getSym();
if (this->sym != RBRACK) {
this->errorHandler->notBracketError();
restract();
}
getSym();
// =
getSym();
std::string expr_var;
expression(&expr_var);
this->midCode->geneArrayAssignMidCode(expr_var, arrVar, index_var);
} else if (this->sym == IDENFR) {
std::string var = this->token.tok;
// identifier
this->errorHandler->identifierNotDefError(this->token.tok);
this->errorHandler->changeConstError(this->token.tok);
getSym();
// =
getSym();
std::string expr_var;
expression(&expr_var);
this->midCode->geneSignalVarAssignMidCode(var, expr_var);
}
this->output->outSyntax("<赋值语句>");
}
bool SyntaxParse::ifStatement() {
this->midCode->resetVar();
std::string label1;
std::string label2;
bool haveReturn = false;
// if
getSym();
// (
label1 = this->midCode->getElseLabel();
label2 = this->midCode->getEndIfLabel();
getSym();
std::string label = this->midCode->getIfLabel();
this->midCode->geneLabelMidCode(label);
qualification(label1, true);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
getSym();
bool hasReturn = statement();
haveReturn = haveReturn || hasReturn;
if (getPreSym(1) == ELSETK) {
getSym();
// else
this->midCode->geneInitRegs();
this->midCode->geneDirJumpMidCode(label2);
this->midCode->geneLabelMidCode(label1);
getSym();
hasReturn = statement();
this->midCode->geneInitRegs();
this->midCode->geneLabelMidCode(label2);
haveReturn = haveReturn || hasReturn;
} else {
this->midCode->geneInitRegs();
this->midCode->geneLabelMidCode(label1);
this->midCode->geneLabelMidCode(label2);
}
this->output->outSyntax("<条件语句>");
return haveReturn;
}
void SyntaxParse::callFuncStatement(std::string *var) {
std::string new_var;
std::string cur_var;
// identifier
this->errorHandler->identifierNotDefError(this->token.tok);
std::string func = this->token.tok;
getSym();
// (
if (getPreSym(1) == RPARENT)
this->sym = NON;
else
getSym();
std::vector<Paramter> params = valueParm();
std::vector<SyntaxType> paramsType;
std::vector<std::string> vars;
std::vector<std::string> funcParams;
funcParams = this->symbolTable->getFuncParams(func);
for (Paramter ¶m: params) {
paramsType.push_back(param.syntaxType);
vars.push_back(param.identifier);
}
new_var = this->midCode->getVar();
if (this->symbolTable->varIsInt(func)) {
this->midCode->geneCallFuncMidCode(func, vars, funcParams, new_var, INT);
} else {
this->midCode->geneCallFuncMidCode(func, vars, funcParams, new_var, CHAR);
}
cur_var = new_var;
this->errorHandler->funcParamError(func, paramsType);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
if (this->symbolTable->funcIsReturn(func)) {
this->output->outSyntax("<有返回值函数调用语句>");
} else {
this->output->outSyntax("<无返回值函数调用语句>");
}
*var = cur_var;
}
void SyntaxParse::scanfStatement() {
std::vector<std::string> vars;
// scanf
getSym();
// (
getSym();
// identifier
vars.push_back(this->token.tok);
this->errorHandler->identifierNotDefError(this->token.tok);
while (getPreSym(1) == COMMA) {
getSym();
// ,
getSym();
// identifier
vars.push_back(this->token.tok);
this->errorHandler->identifierNotDefError(this->token.tok);
}
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
this->midCode->geneScanfMidCode(vars);
this->output->outSyntax("<读语句>");
}
void SyntaxParse::printfStatement() {
this->midCode->resetVar();
// printf
getSym();
// (
getSym();
if (this->sym == STRCON) {
std::string var;
std::string s;
strcon();
s = this->token.tok;
var = this->midCode->pushStringVar(s);
if (getPreSym(1) == COMMA) {
getSym();
// ,
getSym();
std::string expr_var;
expression(&expr_var);
this->midCode->genePrintfMidCode(var, expr_var);
} else {
this->midCode->genePrintfMidCode(var, false);
}
} else {
std::string expr_var;
expression(&expr_var);
this->midCode->genePrintfMidCode(expr_var, true);
}
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
this->output->outSyntax("<写语句>");
}
bool SyntaxParse::returnStatement() {
this->midCode->resetVar();
bool isHaveValue = false;
bool isIntExpr = false;
// return
if (getPreSym(1) == LPARENT) {
isHaveValue = true;
getSym();
// (
getSym();
std::string expr_var;
isIntExpr = expression(&expr_var);
this->midCode->geneReturnMidCode(expr_var);
getSym();
if (this->sym != RPARENT) {
this->errorHandler->notParentError();
restract();
}
} else {
this->midCode->geneReturnMidCode();
}
if (this->funcType == INTRETURNEDFUNC) {
if (!isHaveValue || !isIntExpr)
this->errorHandler->returnFuncError();
} else if (this->funcType == CHARRETURNFUNC) {
if (!isHaveValue || isIntExpr)
this->errorHandler->returnFuncError();
} else {
if (isHaveValue)
this->errorHandler->unreturnFuncError();
}
this->output->outSyntax("<返回语句>");
return true;
}
bool SyntaxParse::expression(std::string *var) {
std::string new_var;
// a var used to express current expr
std::string cur_var;
// a temp var
std::string v;
bool isIntExpr = false;
bool isMinu = false;
if (this->sym == PLUS || this->sym == MINU) {
if (this->sym == MINU)
isMinu = true;
getSym();
isIntExpr = true;
}
std::string item_var;
bool isCon1;
bool isCon2;
bool isIntItem = item(&item_var, &isCon1);
cur_var = item_var;
if (isMinu) {
v = this->midCode->getConVar();
this->midCode->geneConAssignMidCode(v, CONSTINT, "0");
if (cur_var.at(0) == '@' && !isCon1) {
new_var = cur_var;
} else {
new_var = this->midCode->getVar();
}
this->midCode->geneExprMidCode(new_var, INT, v, cur_var, "-");
cur_var = new_var;
}
isIntExpr = isIntExpr || isIntItem;
while (getPreSym(1) == PLUS || getPreSym(1) == MINU) {
getSym();
// + or -
Symbol symbol = this->sym;
getSym();
item(&item_var, &isCon2);
isIntExpr = true;
if (!isCon1 && cur_var.at(0) == '@') {
new_var = cur_var;
} else if (!isCon2 && item_var.at(0) == '@') {
new_var = item_var;
} else {
new_var = this->midCode->getVar();
}
isCon1 = false;
if (symbol == PLUS)
this->midCode->geneExprMidCode(new_var, INT, cur_var, item_var, "+");
else
this->midCode->geneExprMidCode(new_var, INT, cur_var, item_var, "-");
cur_var = new_var;
}
*var = cur_var;
this->output->outSyntax("<表达式>");
return isIntExpr;
}
bool SyntaxParse::item(std::string *var, bool *isCon) {
std::string new_var;
std::string cur_var;
std::string v;
std::string factor_var;
bool isIntItem = false;
bool isCon1;
bool isCon2;
isIntItem = factor(&factor_var, &isCon1);
cur_var = factor_var;
*isCon = isCon1;
while (getPreSym(1) == MULT || getPreSym(1) == DIV) {
*isCon = false;
getSym();
// * or /
Symbol symbol = this->sym;
getSym();
factor(&factor_var, &isCon2);
isIntItem = true;
if (cur_var.at(0) == '@' && !isCon1) {
new_var = cur_var;
} else if (factor_var.at(0) == '@' && !isCon2) {
new_var = factor_var;
} else {
new_var = this->midCode->getVar();
}
isCon1 = false;
if (symbol == MULT)