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/*
* Copyright 2017 WebAssembly Community Group participants
*
* 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 WABT_ERROR_HANDLER_H_
#define WABT_ERROR_HANDLER_H_
#include <string>
#include "src/color.h"
#include "src/common.h"
namespace wabt {
class ErrorHandler {
public:
explicit ErrorHandler(Location::Type);
virtual ~ErrorHandler() {}
// Returns true if the error was handled.
virtual bool OnError(const Location&,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset) = 0;
// Helper function for binary locations.
bool OnError(size_t offset, const std::string& error) {
return OnError(Location(offset), error, std::string(), 0);
}
// OnError will be called with with source_line trimmed to this length.
virtual size_t source_line_max_length() const = 0;
std::string DefaultErrorMessage(const Color&,
const Location&,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset,
int indent);
protected:
Location::Type location_type_;
};
class ErrorHandlerNop : public ErrorHandler {
public:
ErrorHandlerNop();
bool OnError(const Location&,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset) override {
return false;
}
size_t source_line_max_length() const override { return 80; }
};
class ErrorHandlerFile : public ErrorHandler {
public:
enum class PrintHeader {
Never,
Once,
Always,
};
explicit ErrorHandlerFile(Location::Type,
FILE* file = stderr,
const std::string& header = std::string(),
PrintHeader print_header = PrintHeader::Never,
size_t source_line_max_length = 80);
bool OnError(const Location&,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset) override;
size_t source_line_max_length() const override {
return source_line_max_length_;
}
private:
void PrintErrorHeader();
FILE* file_;
std::string header_;
PrintHeader print_header_;
size_t source_line_max_length_;
Color color_;
};
class ErrorHandlerBuffer : public ErrorHandler {
public:
explicit ErrorHandlerBuffer(Location::Type,
size_t source_line_max_length = 80);
bool OnError(const Location&,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset) override;
size_t source_line_max_length() const override {
return source_line_max_length_;
}
const std::string& buffer() const { return buffer_; }
private:
size_t source_line_max_length_;
std::string buffer_;
Color color_;
};
} // namespace wabt
#endif // WABT_ERROR_HANDLER_H_
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