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// Copyright 2011 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 "eval_env.h"
string BindingEnv::LookupVariable(const string& var) {
map<string, string>::iterator i = bindings_.find(var);
if (i != bindings_.end())
return i->second;
if (parent_)
return parent_->LookupVariable(var);
return "";
}
void BindingEnv::AddBinding(const string& key, const string& val) {
bindings_[key] = val;
}
string BindingEnv::LookupWithFallback(const string& var,
const EvalString* eval,
Env* env) {
map<string, string>::iterator i = bindings_.find(var);
if (i != bindings_.end())
return i->second;
if (eval)
return eval->Evaluate(env);
if (parent_)
return parent_->LookupVariable(var);
return "";
}
string EvalString::Evaluate(Env* env) const {
string result;
for (TokenList::const_iterator i = parsed_.begin(); i != parsed_.end(); ++i) {
if (i->second == RAW)
result.append(i->first);
else
result.append(env->LookupVariable(i->first));
}
return result;
}
void EvalString::AddText(StringPiece text) {
// Add it to the end of an existing RAW token if possible.
if (!parsed_.empty() && parsed_.back().second == RAW) {
parsed_.back().first.append(text.str_, text.len_);
} else {
parsed_.push_back(make_pair(text.AsString(), RAW));
}
}
void EvalString::AddSpecial(StringPiece text) {
parsed_.push_back(make_pair(text.AsString(), SPECIAL));
}
string EvalString::Serialize() const {
string result;
for (TokenList::const_iterator i = parsed_.begin();
i != parsed_.end(); ++i) {
result.append("[");
if (i->second == SPECIAL)
result.append("$");
result.append(i->first);
result.append("]");
}
return result;
}
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