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Shell: Add support for brace expansions

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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
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2
Shell/Formatter.h
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@ -59,6 +59,7 @@ private:
virtual void visit(const AST::ListConcatenate*) override;
virtual void visit(const AST::Background*) override;
virtual void visit(const AST::BarewordLiteral*) override;
virtual void visit(const AST::BraceExpansion*) override;
virtual void visit(const AST::CastToCommand*) override;
virtual void visit(const AST::CastToList*) override;
virtual void visit(const AST::CloseFdRedirection*) override;
@ -76,6 +77,7 @@ private:
virtual void visit(const AST::MatchExpr*) override;
virtual void visit(const AST::Or*) override;
virtual void visit(const AST::Pipe*) override;
virtual void visit(const AST::Range*) override;
virtual void visit(const AST::ReadRedirection*) override;
virtual void visit(const AST::ReadWriteRedirection*) override;
virtual void visit(const AST::Sequence*) override;