mirror of
https://github.com/LadybirdBrowser/ladybird.git
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328 lines
10 KiB
C++
328 lines
10 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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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 "AST.h"
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#include <AK/Function.h>
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#include <AK/RefPtr.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/Vector.h>
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namespace Shell {
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class Parser {
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public:
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Parser(StringView input, bool interactive = false)
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: m_input(move(input))
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, m_in_interactive_mode(interactive)
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{
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}
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RefPtr<AST::Node> parse();
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/// Parse the given string *as* an expression
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/// that is to forcefully enclose it in double-quotes.
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RefPtr<AST::Node> parse_as_single_expression();
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NonnullRefPtrVector<AST::Node> parse_as_multiple_expressions();
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struct SavedOffset {
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size_t offset;
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AST::Position::Line line;
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};
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SavedOffset save_offset() const;
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private:
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enum class ShouldReadMoreSequences {
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Yes,
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No,
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};
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enum class StringEndCondition {
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DoubleQuote,
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Heredoc,
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};
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struct SequenceParseResult {
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NonnullRefPtrVector<AST::Node> entries;
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Vector<AST::Position, 1> separator_positions;
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ShouldReadMoreSequences decision;
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};
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struct HeredocInitiationRecord {
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String end;
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RefPtr<AST::Heredoc> node;
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bool interpolate { false };
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bool deindent { false };
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};
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constexpr static size_t max_allowed_nested_rule_depth = 2048;
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RefPtr<AST::Node> parse_toplevel();
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SequenceParseResult parse_sequence();
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RefPtr<AST::Node> parse_function_decl();
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RefPtr<AST::Node> parse_and_logical_sequence();
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RefPtr<AST::Node> parse_or_logical_sequence();
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RefPtr<AST::Node> parse_variable_decls();
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RefPtr<AST::Node> parse_pipe_sequence();
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RefPtr<AST::Node> parse_command();
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RefPtr<AST::Node> parse_control_structure();
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RefPtr<AST::Node> parse_continuation_control();
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RefPtr<AST::Node> parse_for_loop();
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RefPtr<AST::Node> parse_loop_loop();
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RefPtr<AST::Node> parse_if_expr();
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RefPtr<AST::Node> parse_subshell();
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RefPtr<AST::Node> parse_match_expr();
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AST::MatchEntry parse_match_entry();
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RefPtr<AST::Node> parse_match_pattern();
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Optional<Regex<ECMA262>> parse_regex_pattern();
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RefPtr<AST::Node> parse_redirection();
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RefPtr<AST::Node> parse_list_expression();
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RefPtr<AST::Node> parse_expression();
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RefPtr<AST::Node> parse_string_composite();
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RefPtr<AST::Node> parse_string();
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RefPtr<AST::Node> parse_string_inner(StringEndCondition);
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RefPtr<AST::Node> parse_variable();
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RefPtr<AST::Node> parse_variable_ref();
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RefPtr<AST::Slice> parse_slice();
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RefPtr<AST::Node> parse_evaluate();
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RefPtr<AST::Node> parse_history_designator();
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RefPtr<AST::Node> parse_comment();
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RefPtr<AST::Node> parse_bareword();
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RefPtr<AST::Node> parse_glob();
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RefPtr<AST::Node> parse_brace_expansion();
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RefPtr<AST::Node> parse_brace_expansion_spec();
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RefPtr<AST::Node> parse_immediate_expression();
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RefPtr<AST::Node> parse_heredoc_initiation_record();
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bool parse_heredoc_entries();
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template<typename A, typename... Args>
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NonnullRefPtr<A> create(Args&&... args);
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void set_end_condition(OwnPtr<Function<bool()>> condition) { m_end_condition = move(condition); }
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bool at_end() const
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{
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if (m_end_condition && (*m_end_condition)())
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return true;
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return m_input.length() <= m_offset;
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}
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char peek();
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char consume();
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bool expect(char);
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bool expect(StringView);
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bool next_is(StringView);
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void restore_to(size_t offset, AST::Position::Line line)
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{
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m_offset = offset;
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m_line = move(line);
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}
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AST::Position::Line line() const { return m_line; }
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StringView consume_while(Function<bool(char)>);
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struct Offset {
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size_t offset;
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AST::Position::Line line;
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};
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struct ScopedOffset {
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ScopedOffset(Vector<size_t>& offsets, Vector<AST::Position::Line>& lines, size_t offset, size_t lineno, size_t linecol)
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: offsets(offsets)
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, lines(lines)
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, offset(offset)
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, line({ lineno, linecol })
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{
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offsets.append(offset);
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lines.append(line);
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}
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~ScopedOffset()
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{
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auto last = offsets.take_last();
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VERIFY(last == offset);
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auto last_line = lines.take_last();
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VERIFY(last_line == line);
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}
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Vector<size_t>& offsets;
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Vector<AST::Position::Line>& lines;
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size_t offset;
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AST::Position::Line line;
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};
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void restore_to(ScopedOffset const& offset) { restore_to(offset.offset, offset.line); }
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OwnPtr<ScopedOffset> push_start();
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Offset current_position();
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StringView m_input;
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size_t m_offset { 0 };
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AST::Position::Line m_line { 0, 0 };
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Vector<size_t> m_rule_start_offsets;
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Vector<AST::Position::Line> m_rule_start_lines;
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OwnPtr<Function<bool()>> m_end_condition;
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Vector<HeredocInitiationRecord> m_heredoc_initiations;
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Vector<char> m_extra_chars_not_allowed_in_barewords;
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bool m_is_in_brace_expansion_spec { false };
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bool m_continuation_controls_allowed { false };
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bool m_in_interactive_mode { false };
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};
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#if 0
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constexpr auto the_grammar = R"(
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toplevel :: sequence?
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sequence :: variable_decls? or_logical_sequence terminator sequence
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| variable_decls? or_logical_sequence '&' sequence
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| variable_decls? or_logical_sequence
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| variable_decls? function_decl (terminator sequence)?
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| variable_decls? terminator sequence
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function_decl :: identifier '(' (ws* identifier)* ')' ws* '{' [!c] toplevel '}'
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or_logical_sequence :: and_logical_sequence '|' '|' and_logical_sequence
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| and_logical_sequence
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and_logical_sequence :: pipe_sequence '&' '&' and_logical_sequence
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| pipe_sequence
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terminator :: ';'
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| '\n' [?!heredoc_stack.is_empty] heredoc_entries
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heredoc_entries :: { .*? (heredoc_entry) '\n' } [each heredoc_entries]
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variable_decls :: identifier '=' expression (' '+ variable_decls)? ' '*
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| identifier '=' '(' pipe_sequence ')' (' '+ variable_decls)? ' '*
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pipe_sequence :: command '|' '&'? pipe_sequence
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| command
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| control_structure '|' '&'? pipe_sequence
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| control_structure
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control_structure[c] :: for_expr
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| loop_expr
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| if_expr
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| subshell
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| match_expr
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| ?c: continuation_control
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continuation_control :: 'break'
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| 'continue'
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for_expr :: 'for' ws+ (('index' ' '+ identifier ' '+)? identifier ' '+ 'in' ws*)? expression ws+ '{' [c] toplevel '}'
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loop_expr :: 'loop' ws* '{' [c] toplevel '}'
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if_expr :: 'if' ws+ or_logical_sequence ws+ '{' toplevel '}' else_clause?
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else_clause :: else '{' toplevel '}'
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| else if_expr
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subshell :: '{' toplevel '}'
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match_expr :: 'match' ws+ expression ws* ('as' ws+ identifier)? '{' match_entry* '}'
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match_entry :: match_pattern ws* (as identifier_list)? '{' toplevel '}'
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| regex_pattern ws* '{' toplevel '}'
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identifier_list :: '(' (identifier ws*)* ')'
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regex_pattern :: regex_pattern (ws* '|' ws* regex_pattern)*
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match_pattern :: expression (ws* '|' ws* expression)*
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regex_pattern :: '(?:' .* ')' { enclosed string must contain balanced parentheses }
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command :: redirection command
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| list_expression command?
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redirection :: number? '>'{1,2} ' '* string_composite
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| number? '<' ' '* string_composite
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| number? '>' '&' number
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| number? '>' '&' '-'
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list_expression :: ' '* expression (' '+ list_expression)?
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expression :: evaluate expression?
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| string_composite expression?
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| comment expression?
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| immediate_expression expression?
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| history_designator expression?
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| '(' list_expression ')' expression?
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evaluate :: '$' '(' pipe_sequence ')'
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| '$' [lookahead != '('] expression {eval / dynamic resolve}
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string_composite :: string string_composite?
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| variable string_composite?
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| bareword string_composite?
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| glob string_composite?
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| brace_expansion string_composite?
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| heredoc_initiator string_composite? {append to heredoc_entries}
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heredoc_initiator :: '<' '<' '-' bareword {*bareword, interpolate, no deindent}
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| '<' '<' '-' "'" [^']* "'" {*string, no interpolate, no deindent}
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| '<' '<' '~' bareword {*bareword, interpolate, deindent}
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| '<' '<' '~' "'" [^']* "'" {*bareword, no interpolate, deindent}
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string :: '"' dquoted_string_inner '"'
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| "'" [^']* "'"
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dquoted_string_inner :: '\' . dquoted_string_inner? {concat}
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| variable dquoted_string_inner? {compose}
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| . dquoted_string_inner?
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| '\' 'x' xdigit*2 dquoted_string_inner?
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| '\' 'u' xdigit*8 dquoted_string_inner?
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| '\' [abefrnt] dquoted_string_inner?
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variable :: variable_ref slice?
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variable_ref :: '$' identifier
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| '$' '$'
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| '$' '?'
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| '$' '*'
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| '$' '#'
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| ...
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slice :: '[' brace_expansion_spec ']'
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comment :: '#' [^\n]*
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immediate_expression :: '$' '{' immediate_function expression* '}'
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immediate_function :: identifier { predetermined list of names, see Shell.h:ENUMERATE_SHELL_IMMEDIATE_FUNCTIONS }
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history_designator :: '!' event_selector (':' word_selector_composite)?
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event_selector :: '!' {== '-0'}
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| '?' bareword '?'
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| bareword {number: index, otherwise: lookup}
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word_selector_composite :: word_selector ('-' word_selector)?
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word_selector :: number
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| '^' {== 0}
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| '$' {== end}
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bareword :: [^"'*$&#|()[\]{} ?;<>] bareword?
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| '\' [^"'*$&#|()[\]{} ?;<>] bareword?
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bareword_with_tilde_expansion :: '~' bareword?
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glob :: [*?] bareword?
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| bareword [*?]
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brace_expansion :: '{' brace_expansion_spec '}'
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brace_expansion_spec :: expression? (',' expression?)*
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| expression '..' expression
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)";
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#endif
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}
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