| // 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 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; |
| } |