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https://github.com/SerenityOS/serenity
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8f34b493e4
The `consume_quoted_string()` can now take an escape character. This allows it (for example) to capture a string's enclosing quotes. The escape character is optional by default. You can also consume and unescape a quoted string with the eponymous method `consume_and_unescape_string()`. It takes an escape character as parameter (backslash by default). It builds a String in which common escape sequences get... unescaped :^) (e.g. \n, \r, \t...).
126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Benoit Lormeau <blormeau@outlook.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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namespace AK {
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class GenericLexer {
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public:
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explicit GenericLexer(const StringView& input);
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virtual ~GenericLexer();
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// A lambda/function can be used to match characters as the user pleases
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using Condition = Function<bool(char)>;
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size_t tell() const { return m_index; }
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size_t tell_remaining() const { return m_input.length() - m_index; }
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StringView remaining() const { return m_input.substring_view(m_index); }
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bool is_eof() const;
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char peek(size_t offset = 0) const;
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bool next_is(char) const;
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bool next_is(StringView) const;
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bool next_is(const char*) const;
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bool next_is(Condition) const;
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char consume();
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bool consume_specific(char);
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bool consume_specific(StringView);
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bool consume_specific(const char*);
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StringView consume(size_t count);
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StringView consume_all();
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StringView consume_line();
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StringView consume_while(Condition);
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StringView consume_until(char);
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StringView consume_until(const char*);
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StringView consume_until(Condition);
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StringView consume_quoted_string(char escape_char = 0);
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String consume_and_unescape_string(char escape_char = '\\');
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void ignore(size_t count = 1);
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void ignore_while(Condition);
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void ignore_until(char);
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void ignore_until(const char*);
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void ignore_until(Condition);
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protected:
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StringView m_input;
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size_t m_index { 0 };
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};
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constexpr auto is_any_of(const StringView& values)
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{
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return [values](auto c) { return values.contains(c); };
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}
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/*
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* CType adapters: pass them as Conditions to a GenericLexer's methods
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* Examples:
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* - `if (lexer.next_is(is_digit))`
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* - `auto name = lexer.consume_while(is_alphanum);
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* - `lexer.ignore_until(is_any_of("<^>"))`
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*/
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bool is_alpha(char);
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bool is_alphanum(char);
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bool is_control(char);
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bool is_digit(char);
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bool is_graphic(char);
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bool is_hex_digit(char);
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bool is_lowercase(char);
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bool is_path_separator(char);
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bool is_printable(char);
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bool is_punctuation(char);
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bool is_quote(char);
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bool is_uppercase(char);
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bool is_whitespace(char);
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}
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using AK::GenericLexer;
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using AK::is_alpha;
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using AK::is_alphanum;
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using AK::is_any_of;
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using AK::is_control;
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using AK::is_digit;
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using AK::is_graphic;
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using AK::is_hex_digit;
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using AK::is_lowercase;
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using AK::is_path_separator;
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using AK::is_printable;
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using AK::is_punctuation;
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using AK::is_quote;
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using AK::is_uppercase;
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using AK::is_whitespace;
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