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Factor handbook » The language » Syntax » Parse time evaluation

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Vocabulary
syntax

Syntax

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Word description
Evaluates some code at parse time.

Notes
The code may access the parser's accumulation vector with stack effect ( accum -- accum ), for example to append a literal using suffix!. Code with stack effect ( -- ) is also accepted.

Calling words defined in the same source file at parse time is prohibited; see Compilation units.

See also
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Definition

USING: combinators compiler.units parser quotations ;

IN: syntax

SYNTAX: <<
    [ \ >> parse-until >quotation ] with-nested-compilation-unit
    ( accum -- accum ) call-effect ;