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eval_env.h
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// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef NINJA_EVAL_ENV_H_
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#define NINJA_EVAL_ENV_H_
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#include <map>
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#include <string>
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#include <vector>
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using namespace
std;
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#include "
string_piece.h
"
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struct
EvalString
;
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/// An interface for a scope for variable (e.g. "$foo") lookups.
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struct
Env
{
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virtual
~Env
() {}
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virtual
string
LookupVariable(
const
string
& var) = 0;
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};
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/// An Env which contains a mapping of variables to values
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/// as well as a pointer to a parent scope.
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struct
BindingEnv
:
public
Env
{
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BindingEnv
() : parent_(NULL) {}
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explicit
BindingEnv
(
Env
* parent) : parent_(parent) {}
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virtual
~BindingEnv
() {}
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virtual
string
LookupVariable(
const
string
& var);
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void
AddBinding(
const
string
& key,
const
string
& val);
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/// This is tricky. Edges want lookup scope to go in this order:
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/// 1) value set on edge itself (edge_->env_)
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/// 2) value set on rule, with expansion in the edge's scope
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/// 3) value set on enclosing scope of edge (edge_->env_->parent_)
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/// This function takes as parameters the necessary info to do (2).
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string
LookupWithFallback(
const
string
& var,
const
EvalString
* eval,
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Env
* env);
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private
:
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map<string, string>
bindings_
;
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Env
*
parent_
;
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};
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/// A tokenized string that contains variable references.
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/// Can be evaluated relative to an Env.
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struct
EvalString
{
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string
Evaluate(
Env
* env)
const
;
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void
Clear
() { parsed_.clear(); }
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bool
empty
()
const
{
return
parsed_.empty(); }
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void
AddText(
StringPiece
text);
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void
AddSpecial(
StringPiece
text);
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/// Construct a human-readable representation of the parsed state,
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/// for use in tests.
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string
Serialize()
const
;
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private
:
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enum
TokenType
{ RAW, SPECIAL };
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typedef
vector<pair<string, TokenType> >
TokenList
;
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TokenList
parsed_
;
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};
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#endif // NINJA_EVAL_ENV_H_
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