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Rewrote Emph/Strong parsers to avoid exponential blowup. [jgm/peg-markdown]

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See https://github.com/jgm/peg-markdown/commit/39dfc1c
This commit is contained in:
Michael Teichgräber 2013-01-23 22:35:43 +01:00
parent 6bfe7a1a46
commit e5cc35f577
2 changed files with 9 additions and 21 deletions
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28
parser.leg
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@ -529,27 +529,19 @@ UlOrStarLine = (UlLine | StarLine) { $$ = p.mkString(yytext) }
StarLine = < "****" '*'* > | < Spacechar '*'+ &Spacechar >
UlLine = < "____" '_'* > | < Spacechar '_'+ &Spacechar >
SpaceInline = a:StartList
( (b:Space | b:Endline) { a = cons(b, a) } )+
c:Inline { a = cons(c, a); $$ = p.mkList(LIST, a) }
NonspaceInline = !Spacechar !Newline Inline
Emph = EmphStar | EmphUl
EmphStar = '*'
EmphStar = '*' &Nonspacechar
a:StartList
( !'*' b:NonspaceInline { a = cons(b, a) }
| b:SpaceInline { a = cons(b, a) }
( !'*' b:Inline { a = cons(b, a) }
| b:StrongStar { a = cons(b, a) }
)+
'*'
{ $$ = p.mkList(EMPH, a) }
EmphUl = '_'
EmphUl = '_' &Nonspacechar
a:StartList
( !'_' b:NonspaceInline { a = cons(b, a) }
| b:SpaceInline { a = cons(b, a) }
( !'_' b:Inline { a = cons(b, a) }
| b:StrongUl { a = cons(b, a) }
)+
'_'
@ -557,19 +549,15 @@ EmphUl = '_'
Strong = StrongStar | StrongUl
StrongStar = "**"
StrongStar = "**" &Nonspacechar
a:StartList
( !"**" b:NonspaceInline { a = cons(b, a) }
| b:SpaceInline { a = cons(b, a) }
)+
( !"**" b:Inline { a = cons(b, a) })+
"**"
{ $$ = p.mkList(STRONG, a) }
StrongUl = "__"
StrongUl = "__" &Nonspacechar
a:StartList
( !"__" b:NonspaceInline { a = cons(b, a) }
| b:SpaceInline { a = cons(b, a) }
)+
( !"__" b:Inline { a = cons(b, a) })+
"__"
{ $$ = p.mkList(STRONG, a) }

2
portid
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@ -1 +1 @@
195
196