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EBNF[[

Vocabulary
peg.ebnf

Syntax

EBNF: word [=[ ...ebnf... ]=]

Inputs
None

Outputs
None

Word description
Defines a word that when called will parse a string using the syntax defined with the EBNF DSL. The word has stack effect ( string -- ast ) where 'string' is the text to be parsed and 'ast' is the resulting abstract syntax tree. If the parsing fails the word throws an exception.

Examples

USING: prettyprint multiline peg.ebnf ; IN: scratchpad EBNF: foo [=[ rule="a" "b" ]=] "ab" foo .
V{ "a" "b" }

Definition

USING: accessors kernel parser peg peg.ebnf.private words ;

IN: peg.ebnf

SYNTAX: EBNF:
    reset-tokenizer scan-new-word dup scan-object ebnf>quot
    swapd [ "ebnf-quot" set-word-prop ] 2keep
    [ check-parse-result ast>> ] compose
    ( input -- ast ) define-declared "ebnf-parser" set-word-prop
    ;