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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "var.h"
#include "log.h"
#include "value.h"
UndefinedVar kUndefinedBuf;
UndefinedVar* kUndefined = &kUndefinedBuf;
Var::Var() {
}
Var::~Var() {
}
void Var::AppendVar(Evaluator*, Value*) {
CHECK(false);
}
SimpleVar::SimpleVar(shared_ptr<string> v, const char* origin)
: v_(v), origin_(origin) {
}
void SimpleVar::Eval(Evaluator*, string* s) const {
*s += *v_;
}
void SimpleVar::AppendVar(Evaluator* ev, Value* v) {
shared_ptr<string> s = make_shared<string>(*v_);
s->push_back(' ');
v->Eval(ev, s.get());
v_ = s;
}
StringPiece SimpleVar::String() const {
return *v_;
}
string SimpleVar::DebugString() const {
return *v_;
}
RecursiveVar::RecursiveVar(Value* v, const char* origin, StringPiece orig)
: v_(v), origin_(origin), orig_(orig) {
}
void RecursiveVar::Eval(Evaluator* ev, string* s) const {
v_->Eval(ev, s);
}
void RecursiveVar::AppendVar(Evaluator*, Value* v) {
v_ = NewExpr3(v_, NewLiteral(" "), v);
}
StringPiece RecursiveVar::String() const {
return orig_;
}
string RecursiveVar::DebugString() const {
return v_->DebugString();
}
UndefinedVar::UndefinedVar() {}
void UndefinedVar::Eval(Evaluator*, string*) const {
// Nothing to do.
}
StringPiece UndefinedVar::String() const {
return STRING_PIECE("");
}
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;
}
}
ScopedVar::ScopedVar(Vars* vars, StringPiece name, Var* var)
: vars_(vars), orig_(NULL) {
auto p = vars->insert(make_pair(name, var));
iter_ = p.first;
if (!p.second) {
orig_ = iter_->second;
iter_->second = var;
}
}
ScopedVar::~ScopedVar() {
if (orig_) {
iter_->second = orig_;
} else {
vars_->erase(iter_);
}
}
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