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// 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_READER_WGSL_LEXER_H_
#define SRC_READER_WGSL_LEXER_H_
#include <string>
#include "src/reader/wgsl/token.h"
namespace tint {
namespace reader {
namespace wgsl {
/// Converts the input stream into a series of Tokens
class Lexer {
public:
/// Creates a new Lexer
/// @param file_path the path to the file containing the source
/// @param content the source content
Lexer(const std::string& file_path, const Source::FileContent* content);
~Lexer();
/// Returns the next token in the input stream
/// @return Token
Token next();
private:
void skip_whitespace();
void skip_comments();
Token build_token_from_int_if_possible(Source source,
size_t start,
size_t end,
int32_t base);
Token check_keyword(const Source&, const std::string&);
Token try_float();
Token try_hex_integer();
Token try_ident();
Token try_integer();
Token try_punctuation();
Source begin_source() const;
void end_source(Source&) const;
bool is_eof() const;
bool is_alpha(char ch) const;
bool is_digit(char ch) const;
bool is_hex(char ch) const;
bool is_alphanum(char ch) const;
bool matches(size_t pos, const std::string& substr);
/// The source file path
std::string const file_path_;
/// The source file content
Source::FileContent const* const content_;
/// The length of the input
uint32_t len_ = 0;
/// The current position within the input
uint32_t pos_ = 0;
/// The current location within the input
Source::Location location_;
};
} // namespace wgsl
} // namespace reader
} // namespace tint
#endif // SRC_READER_WGSL_LEXER_H_