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Support for repeat0 in ebnf

release
Chris Double 2007-11-28 11:33:21 +13:00
parent 16a0cc9eb1
commit 7a414869de
1 changed files with 8 additions and 1 deletions
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9
extra/peg/ebnf/ebnf.factor
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@ -7,6 +7,7 @@ TUPLE: ebnf-non-terminal symbol ;
TUPLE: ebnf-terminal symbol ;
TUPLE: ebnf-choice options ;
TUPLE: ebnf-sequence elements ;
TUPLE: ebnf-repeat0 group ;
TUPLE: ebnf-rule symbol elements ;
TUPLE: ebnf rules ;
@ -14,6 +15,7 @@ C: <ebnf-non-terminal> ebnf-non-terminal
C: <ebnf-terminal> ebnf-terminal
C: <ebnf-choice> ebnf-choice
C: <ebnf-sequence> ebnf-sequence
C: <ebnf-repeat0> ebnf-repeat0
C: <ebnf-rule> ebnf-rule
C: <ebnf> ebnf
@ -49,6 +51,11 @@ M: ebnf-sequence ebnf-compile ( ast -- quot )
[ call ] , \ map , \ seq ,
] [ ] make ;
M: ebnf-repeat0 ebnf-compile ( ast -- quot )
[
ebnf-repeat0-group ebnf-compile % \ repeat0 ,
] [ ] make ;
M: ebnf-rule ebnf-compile ( ast -- quot )
[
dup ebnf-rule-symbol , \ in , \ get , \ create ,
@ -85,7 +92,7 @@ DEFER: 'rhs'
"{" token sp hide
[ 'rhs' sp ] delay
"}" token sp hide
3array seq ;
3array seq [ first <ebnf-repeat0> ] action ;
: 'rhs' ( -- parser )
'repeat0'