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833ccab384
This CL updates match to compare against characters instead of strings. If the prefix character doesn't match we stop checking for any punctuation which starts with that character. Change-Id: Ifddc1ff3f3936ab3a53c37e080394ed35dc2aecf Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97065 Auto-Submit: Dan Sinclair <dsinclair@chromium.org> Reviewed-by: Ben Clayton <bclayton@google.com> Commit-Queue: Ben Clayton <bclayton@google.com> Kokoro: Kokoro <noreply+kokoro@google.com>
110 lines
3.9 KiB
C++
110 lines
3.9 KiB
C++
// Copyright 2020 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_READER_WGSL_LEXER_H_
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#define SRC_TINT_READER_WGSL_LEXER_H_
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#include <string>
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#include "src/tint/reader/wgsl/token.h"
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namespace tint::reader::wgsl {
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/// Converts the input stream into a series of Tokens
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class Lexer {
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public:
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/// Creates a new Lexer
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/// @param file the source file
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explicit Lexer(const Source::File* file);
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~Lexer();
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/// Returns the next token in the input stream.
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/// @return Token
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Token next();
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private:
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/// Advances past blankspace and comments, if present at the current position.
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/// @returns error token, EOF, or uninitialized
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Token skip_blankspace_and_comments();
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/// Advances past a comment at the current position, if one exists.
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/// Returns an error if there was an unterminated block comment,
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/// or a null character was present.
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/// @returns uninitialized token on success, or error
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Token skip_comment();
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Token build_token_from_int_if_possible(Source source, size_t start, int32_t base);
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Token check_keyword(const Source&, std::string_view);
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/// The try_* methods have the following in common:
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/// - They assume there is at least one character to be consumed,
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/// i.e. the input has not yet reached end of file.
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/// - They return an initialized token when they match and consume
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/// a token of the specified kind.
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/// - Some can return an error token.
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/// - Otherwise they return an uninitialized token when they did not
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/// match a token of the specfied kind.
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Token try_float();
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Token try_hex_float();
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Token try_hex_integer();
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Token try_ident();
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Token try_integer();
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Token try_punctuation();
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Source begin_source() const;
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void end_source(Source&) const;
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/// @returns view of current line
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const std::string_view line() const;
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/// @returns position in current line
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size_t pos() const;
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/// @returns length of current line
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size_t length() const;
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/// @returns reference to character at `pos` within current line
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const char& at(size_t pos) const;
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/// @returns substring view at `offset` within current line of length `count`
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std::string_view substr(size_t offset, size_t count);
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/// advances current position by `offset` within current line
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void advance(size_t offset = 1);
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/// sets current position to `pos` within current line
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void set_pos(size_t pos);
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/// advances current position to next line
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void advance_line();
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/// @returns true if the end of the input has been reached.
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bool is_eof() const;
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/// @returns true if the end of the current line has been reached.
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bool is_eol() const;
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/// @returns true if there is another character on the input and
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/// it is not null.
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bool is_null() const;
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/// @param ch a character
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/// @returns true if 'ch' is a decimal digit
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bool is_digit(char ch) const;
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/// @param ch a character
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/// @returns true if 'ch' is a hexadecimal digit
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bool is_hex(char ch) const;
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/// @returns true if string at `pos` matches `substr`
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bool matches(size_t pos, std::string_view substr);
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/// @returns true if char at `pos` matches `ch`
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bool matches(size_t pos, char ch);
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/// The source file content
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Source::File const* const file_;
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/// The current location within the input
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Source::Location location_;
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};
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} // namespace tint::reader::wgsl
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#endif // SRC_TINT_READER_WGSL_LEXER_H_
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