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Shell: Add (basic) support for history event designators

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Closes #4888
This commit is contained in:
AnotherTest 2021-01-11 13:04:59 +03:30 • committed by Andreas Kling
parent 15fde85b21
commit 239472ba69
9 changed files with 457 additions and 19 deletions
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19
Userland/Shell/Parser.h
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@ -43,6 +43,10 @@ public:
}
RefPtr<AST::Node> parse();
/// Parse the given string *as* an expression
/// that is to forefully enclose it in double-quotes.
RefPtr<AST::Node> parse_as_single_expression();
NonnullRefPtrVector<AST::Node> parse_as_multiple_expressions();
struct SavedOffset {
size_t offset;
@ -77,6 +81,7 @@ private:
RefPtr<AST::Node> parse_doublequoted_string_inner();
RefPtr<AST::Node> parse_variable();
RefPtr<AST::Node> parse_evaluate();
RefPtr<AST::Node> parse_history_designator();
RefPtr<AST::Node> parse_comment();
RefPtr<AST::Node> parse_bareword();
RefPtr<AST::Node> parse_glob();
@ -140,6 +145,7 @@ private:
Vector<size_t> m_rule_start_offsets;
Vector<AST::Position::Line> m_rule_start_lines;
Vector<char> m_extra_chars_not_allowed_in_barewords;
bool m_is_in_brace_expansion_spec { false };
bool m_continuation_controls_allowed { false };
};
@ -215,6 +221,7 @@ list_expression :: ' '* expression (' '+ list_expression)?
expression :: evaluate expression?
| string_composite expression?
| comment expression?
| history_designator expression?
| '(' list_expression ')' expression?
evaluate :: '$' '(' pipe_sequence ')'
@ -244,6 +251,18 @@ variable :: '$' identifier
comment :: '#' [^\n]*
history_designator :: '!' event_selector (':' word_selector_composite)?
event_selector :: '!' {== '-0'}
| '?' bareword '?'
| bareword {number: index, otherwise: lookup}
word_selector_composite :: word_selector ('-' word_selector)?
word_selector :: number
| '^' {== 0}
| '$' {== end}
bareword :: [^"'*$&#|()[\]{} ?;<>] bareword?
| '\' [^"'*$&#|()[\]{} ?;<>] bareword?