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Shell: Add support for brace expansions

This adds support for (basic) brace expansions with the following
syntaxes:
- `{expr?,expr?,expr?,...}` which is directly equivalent to `(expr expr
  expr ...)`, with the missing expressions replaced with an empty string
  literal.
- `{expr..expr}` which is a new range expansion, with two modes:
    - if both expressions are one unicode code point long, the range is
      equivalent to the two code points and all code points between the
      two (numerically).
    - if both expressions are numeric, the range is equivalent to both
      numbers, and all numbers between the two.
    - otherwise, it is equivalent to `(expr expr)`.

Closes #3832.
This commit is contained in:
AnotherTest 2020-10-24 18:13:02 +03:30 committed by Andreas Kling
parent 567f2f3548
commit 5640e1bc3a
9 changed files with 374 additions and 3 deletions

View file

@ -77,6 +77,8 @@ private:
RefPtr<AST::Node> parse_comment();
RefPtr<AST::Node> parse_bareword();
RefPtr<AST::Node> parse_glob();
RefPtr<AST::Node> parse_brace_expansion();
RefPtr<AST::Node> parse_brace_expansion_spec();
template<typename A, typename... Args>
NonnullRefPtr<A> create(Args... args);
@ -86,6 +88,7 @@ private:
char consume();
bool expect(char);
bool expect(const StringView&);
bool next_is(const StringView&);
void restore_to(size_t offset, AST::Position::Line line)
{
@ -133,6 +136,8 @@ private:
Vector<size_t> m_rule_start_offsets;
Vector<AST::Position::Line> m_rule_start_lines;
bool m_is_in_brace_expansion_spec { false };
};
#if 0
@ -206,6 +211,7 @@ string_composite :: string string_composite?
| variable string_composite?
| bareword string_composite?
| glob string_composite?
| brace_expansion string_composite?
string :: '"' dquoted_string_inner '"'
| "'" [^']* "'"
@ -232,6 +238,11 @@ bareword_with_tilde_expansion :: '~' bareword?
glob :: [*?] bareword?
| bareword [*?]
brace_expansion :: '{' brace_expansion_spec '}'
brace_expansion_spec :: expression? (',' expression?)*
| expression '..' expression
)";
#endif