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#include "var.h"
#include "value.h"
UndefinedVar kUndefinedBuf;
UndefinedVar* kUndefined = &kUndefinedBuf;
Var::Var() {
}
Var::~Var() {
}
SimpleVar::SimpleVar(shared_ptr<string> v, const char* origin)
: v_(v), origin_(origin) {
}
void SimpleVar::Eval(Evaluator*, string* s) const {
*s += *v_;
}
string SimpleVar::DebugString() const {
return *v_;
}
RecursiveVar::RecursiveVar(Value* v, const char* origin)
: v_(v), origin_(origin) {
}
void RecursiveVar::Eval(Evaluator* ev, string* s) const {
v_->Eval(ev, s);
}
string RecursiveVar::DebugString() const {
return v_->DebugString();
}
UndefinedVar::UndefinedVar() {}
void UndefinedVar::Eval(Evaluator*, string*) const {
// Nothing to do.
}
string UndefinedVar::DebugString() const {
return "*undefined*";
}
Vars::~Vars() {
for (auto p : *this) {
delete p.second;
}
}
Var* Vars::Lookup(StringPiece name) const {
auto found = find(name);
if (found == end())
return kUndefined;
return found->second;
}
void Vars::Assign(StringPiece name, Var* v) {
auto p = insert(make_pair(name, v));
if (!p.second) {
if (p.first->second->IsDefined())
delete p.first->second;
p.first->second = v;
}
}
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