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#ifndef NINJA_EVAL_ENV_H_
#define NINJA_EVAL_ENV_H_
#include <map>
using namespace std;
// A scope for variable lookups.
struct Env {
virtual string LookupVariable(const string& var) = 0;
};
// A standard scope, which contains a mapping of variables to values
// as well as a pointer to a parent scope.
struct BindingEnv : public Env {
virtual string 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 AddBinding(const string& key, const string& val) {
bindings_[key] = val;
}
map<string, string> bindings_;
Env* parent_;
};
// A tokenized string that contains variable references.
// Can be evaluated relative to an Env.
struct EvalString {
bool Parse(const string& input, string* err);
string Evaluate(Env* env) const;
const string& unparsed() const { return unparsed_; }
const bool empty() const { return unparsed_.empty(); }
string unparsed_;
enum TokenType { RAW, SPECIAL };
typedef vector<pair<string, TokenType> > TokenList;
TokenList parsed_;
};
#endif // NINJA_EVAL_ENV_H_
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