// Copyright 2020 The Tint Authors.
//
// 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.

#ifndef SRC_TINT_READER_READER_H_
#define SRC_TINT_READER_READER_H_

#include <string>

#include "src/tint/program.h"

namespace tint::reader {

/// Base class for input readers
class Reader {
  public:
    virtual ~Reader();

    /// Parses the input data
    /// @returns true if the parse was successful
    virtual bool Parse() = 0;

    /// @returns true if an error was encountered.
    bool has_error() const { return diags_.contains_errors(); }

    /// @returns the parser error string
    std::string error() const {
        diag::Formatter formatter{{false, false, false, false}};
        return formatter.format(diags_);
    }

    /// @returns the full list of diagnostic messages.
    const diag::List& diagnostics() const { return diags_; }

    /// @returns the program. The program builder in the parser will be reset
    /// after this.
    virtual Program program() = 0;

  protected:
    /// Constructor
    Reader();

    /// Sets the diagnostic messages
    /// @param diags the list of diagnostic messages
    void set_diagnostics(const diag::List& diags) { diags_ = diags; }

    /// All diagnostic messages from the reader.
    diag::List diags_;
};

}  // namespace tint::reader

#endif  // SRC_TINT_READER_READER_H_