ast_expr.cc

编译原理课程设计之pp2语法分析程序

/* File: ast_expr.cc
 * -----------------
 * Implementation of expression node classes.
 */
#include "ast_expr.h"
#include "ast_type.h"
#include "ast_decl.h"


IntConstant::IntConstant(yyltype loc, int val) : Expr(loc) {
    value = val;
}
void IntConstant::PrintChildren(int indentLevel) { 
    printf("%d", value);
}

DoubleConstant::DoubleConstant(yyltype loc, double val) : Expr(loc) {
    value = val;
}
void DoubleConstant::PrintChildren(int indentLevel) { 
    printf("%g", value);
}

BoolConstant::BoolConstant(yyltype loc, bool val) : Expr(loc) {
    value = val;
}
void BoolConstant::PrintChildren(int indentLevel) { 
    printf("%s", value ? "true" : "false");
}

StringConstant::StringConstant(yyltype loc, const char *val) : Expr(loc) {
    Assert(val != NULL);
    value = strdup(val);
}
void StringConstant::PrintChildren(int indentLevel) { 
    printf("%s",value);
}

Operator::Operator(yyltype loc, const char *tok) : Node(loc) {
    Assert(tok != NULL);
    strncpy(tokenString, tok, sizeof(tokenString));
}

void Operator::PrintChildren(int indentLevel) {
    printf("%s",tokenString);
}

CompoundExpr::CompoundExpr(Expr *l, Operator *o, Expr *r) 
  : Expr(Join(l->GetLocation(), r->GetLocation())) {
    Assert(l != NULL && o != NULL && r != NULL);
    (op=o)->SetParent(this);
    (left=l)->SetParent(this); 
    (right=r)->SetParent(this);
}

CompoundExpr::CompoundExpr(Operator *o, Expr *r) 
  : Expr(Join(o->GetLocation(), r->GetLocation())) {
    Assert(o != NULL && r != NULL);
    left = NULL; 
    (op=o)->SetParent(this);
    (right=r)->SetParent(this);
}

void CompoundExpr::PrintChildren(int indentLevel) {
   if (left) left->Print(indentLevel+1);
   op->Print(indentLevel+1);
   right->Print(indentLevel+1);
}
   
  
ArrayAccess::ArrayAccess(yyltype loc, Expr *b, Expr *s) : LValue(loc) {
    (base=b)->SetParent(this); 
    (subscript=s)->SetParent(this);
}

void ArrayAccess::PrintChildren(int indentLevel) {
    base->Print(indentLevel+1);
    subscript->Print(indentLevel+1, "(subscript) ");
  }
     
FieldAccess::FieldAccess(Expr *b, Identifier *f) 
  : LValue(b? Join(b->GetLocation(), f->GetLocation()) : *f->GetLocation()) {
    Assert(f != NULL); // b can be be NULL (just means no explicit base)
    base = b; 
    if (base) base->SetParent(this); 
    (field=f)->SetParent(this);
}


  void FieldAccess::PrintChildren(int indentLevel) {
    if (base) base->Print(indentLevel+1);
    field->Print(indentLevel+1);
  }

Call::Call(yyltype loc, Expr *b, Identifier *f, List<Expr*> *a) : Expr(loc)  {
    Assert(f != NULL && a != NULL); // b can be be NULL (just means no explicit base)
    base = b;
    if (base) base->SetParent(this);
    (field=f)->SetParent(this);
    (actuals=a)->SetParentAll(this);
}

 void Call::PrintChildren(int indentLevel) {
    if (base) base->Print(indentLevel+1);
    field->Print(indentLevel+1);
    actuals->PrintAll(indentLevel+1, "(actuals) ");
  }
 

NewExpr::NewExpr(yyltype loc, NamedType *c) : Expr(loc) { 
  Assert(c != NULL);
  (cType=c)->SetParent(this);
}

void NewExpr::PrintChildren(int indentLevel) {	
    cType->Print(indentLevel+1);
}

NewArrayExpr::NewArrayExpr(yyltype loc, Expr *sz, Type *et) : Expr(loc) {
    Assert(sz != NULL && et != NULL);
    (size=sz)->SetParent(this); 
    (elemType=et)->SetParent(this);
}

void NewArrayExpr::PrintChildren(int indentLevel) {
    size->Print(indentLevel+1);
    elemType->Print(indentLevel+1);
}

ConditionalExpr::ConditionalExpr(Expr *e1, Operator *o1, Expr *e2, Operator *o2, Expr *e3) 
    : Expr(Join(e1->GetLocation(),e2->GetLocation()))
{
    Assert(e1 != NULL && e2 != NULL && e3 != NULL && o1 != NULL && o2 != NULL);
    (expr1=e1)->SetParent(this);
    (expr2=e2)->SetParent(this);
    (expr3=e3)->SetParent(this);
    (op1=o1)->SetParent(this);
    (op2=o2)->SetParent(this);
}       

void ConditionalExpr::PrintChildren(int indentLevel)
{
    expr1->Print(indentLevel+1);
    op1->Print(indentLevel+1);
    expr2->Print(indentLevel+1);
    op2->Print(indentLevel+1);
    expr3->Print(indentLevel+1);
}