// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef TOOLS_GN_SUBSTITUTION_PATTERN_H_
#define TOOLS_GN_SUBSTITUTION_PATTERN_H_

#include <string>
#include <vector>

#include "tools/gn/substitution_type.h"

class Err;
class ParseNode;
class Value;

// Represents a string with {{substitution_patterns}} in them.
class SubstitutionPattern {
 public:
  struct Subrange {
    Subrange();
    Subrange(SubstitutionType t, const std::string& l = std::string());
    ~Subrange();

    SubstitutionType type;

    // When type_ == LITERAL, this specifies the literal.
    std::string literal;
  };

  SubstitutionPattern();
  ~SubstitutionPattern();

  // Parses the given string and fills in the pattern. The pattern must only
  // be initialized once. On failure, returns false and sets the error.
  bool Parse(const Value& value, Err* err);
  bool Parse(const std::string& str, const ParseNode* origin, Err* err);

  // Returns the pattern as a string with substitutions in them.
  std::string AsString() const;

  // Sets the bits in the given vector corresponding to the substitutions used
  // by this pattern. SUBSTITUTION_LITERAL is ignored.
  void FillRequiredTypes(bool required_types[SUBSTITUTION_NUM_TYPES]) const;

  // Returns a vector listing the substitutions used by this pattern, not
  // counting SUBSTITUTION_LITERAL.
  const std::vector<SubstitutionType>& required_types() const {
    return required_types_;
  }

  const std::vector<Subrange>& ranges() const { return ranges_; }
  bool empty() const { return ranges_.empty(); }

 private:
  std::vector<Subrange> ranges_;

  std::vector<SubstitutionType> required_types_;
};

#endif  // TOOLS_GN_SUBSTITUTION_PATTERN_H_