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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
130 lines
3.4 KiB
C++
130 lines
3.4 KiB
C++
/*
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* Copyright (c) 2020, Benoit Lormeau <blormeau@outlook.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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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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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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void retreat();
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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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char consume_escaped_character(char escape_char = '\\', const StringView& escape_map = "n\nr\rt\tb\bf\f");
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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_until(char);
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StringView consume_until(const char*);
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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_until(char);
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void ignore_until(const char*);
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/*
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* Conditions are used to match arbitrary characters. You can use lambdas,
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* ctype functions, or is_any_of() and its derivatives (see below).
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* A few examples:
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* - `if (lexer.next_is(isdigit))`
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* - `auto name = lexer.consume_while([](char c) { return isalnum(c) || c == '_'; });`
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* - `lexer.ignore_until(is_any_of("<^>"));`
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*/
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// Test the next character against a Condition
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template<typename C>
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bool next_is(C condition) const
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{
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return condition(peek());
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}
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// Consume and return characters while `condition` returns true
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template<typename C>
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StringView consume_while(C condition)
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{
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size_t start = m_index;
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while (!is_eof() && condition(peek()))
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m_index++;
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size_t length = m_index - start;
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if (length == 0)
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return {};
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return m_input.substring_view(start, length);
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}
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// Consume and return characters until `condition` return true
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template<typename C>
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StringView consume_until(C condition)
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{
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size_t start = m_index;
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while (!is_eof() && !condition(peek()))
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m_index++;
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size_t length = m_index - start;
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if (length == 0)
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return {};
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return m_input.substring_view(start, length);
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}
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// Ignore characters while `condition` returns true
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template<typename C>
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void ignore_while(C condition)
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{
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while (!is_eof() && condition(peek()))
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m_index++;
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}
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// Ignore characters until `condition` return true
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// We don't skip the stop character as it may not be a unique value
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template<typename C>
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void ignore_until(C condition)
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{
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while (!is_eof() && !condition(peek()))
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m_index++;
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}
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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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constexpr auto is_path_separator = is_any_of("/\\");
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constexpr auto is_quote = is_any_of("'\"");
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}
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using AK::GenericLexer;
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using AK::is_any_of;
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using AK::is_path_separator;
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using AK::is_quote;
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