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markdown_parser.leg
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markdown_parser.leg
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%{
/**********************************************************************
markdown_parser.leg - markdown parser in C using a PEG grammar.
(c) 2008 John MacFarlane (jgm at berkeley dot edu).
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License or the MIT
license. See LICENSE for details.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
***********************************************************************/
#include <stdbool.h>
#include <assert.h>
#include "markdown_peg.h"
#include "utility_functions.h"
/**********************************************************************
Definitions for leg parser generator.
YY_INPUT is the function the parser calls to get new input.
We take all new input from (static) charbuf.
***********************************************************************/
# define YYSTYPE element *
#ifdef __DEBUG__
# define YY_DEBUG 1
#endif
#define YY_INPUT(buf, result, max_size) \
{ \
int yyc; \
if (charbuf && *charbuf != '\0') { \
yyc= *charbuf++; \
} else { \
yyc= EOF; \
} \
result= (EOF == yyc) ? 0 : (*(buf)= yyc, 1); \
}
#define YY_RULE(T) T
/**********************************************************************
PEG grammar and parser actions for markdown syntax.
***********************************************************************/
%}
Doc = BOM? a:StartList ( Block { a = cons($$, a); } )*
{ parse_result = reverse(a); }
Block = BlankLine*
( BlockQuote
| SpoilerBlock
| Verbatim
| CodeBlock
| Note
| Reference
| HorizontalRule
| Heading
| OrderedList
| BulletList
| HtmlBlock
| StyleBlock
| Audio
| Video
| Para
| Plain )
Para = NonindentSpace a:Inlines BlankLine+
{ $$ = a; $$->key = PARA; }
Plain = a:Inlines
{ $$ = a; $$->key = PLAIN; }
AtxInline = !Newline !(Sp '#'* Sp Newline) Inline
AtxStart = < ( "######" | "#####" | "####" | "###" | "##" | "#" ) > Spacechar+
{ $$ = mk_element(H1 + (strlen(yytext) - 1)); }
AtxHeading = s:AtxStart Sp a:StartList ( AtxInline { a = cons($$, a); } )+ (Sp '#'* Sp)? Newline
{ $$ = mk_list(s->key, a);
free(s); }
SetextHeading = SetextHeading1 | SetextHeading2
SetextBottom1 = '='+ Newline
SetextBottom2 = '-'+ Newline
SetextHeading1 = &(RawLine SetextBottom1)
a:StartList ( !Endline Inline { a = cons($$, a); } )+ Sp Newline
SetextBottom1 { $$ = mk_list(H1, a); }
SetextHeading2 = &(RawLine SetextBottom2)
a:StartList ( !Endline Inline { a = cons($$, a); } )+ Sp Newline
SetextBottom2 { $$ = mk_list(H2, a); }
Heading = SetextHeading | AtxHeading
BlockQuote = a:BlockQuoteRaw
{ $$ = mk_element(BLOCKQUOTE);
$$->children = a;
}
BlockQuoteRaw = a:StartList
(( '>' ' '? Line { a = cons($$, a); } )
( !'>' !BlankLine Line { a = cons($$, a); } )*
( BlankLine { a = cons(mk_str("\n"), a); } )*
)+
{ $$ = mk_str_from_list(a, true);
$$->key = RAW;
}
SpoilerBlock = &{ extension(EXT_SPOILERBLOCK) }
a:SpoilerBlockRaw
{ $$ = mk_element(SPOILERBLOCK);
$$->children = a;
}
SpoilerBlockRaw = a:StartList
(( "?>" ' '? Line { a = cons($$, a); } )
( !"?>" !BlankLine Line { a = cons($$, a); } )*
( BlankLine { a = cons(mk_str("\n"), a); } )*
)+
{ $$ = mk_str_from_list(a, true);
$$->key = RAW;
}
NonblankIndentedLine = !BlankLine IndentedLine
VerbatimChunk = a:StartList
( BlankLine { a = cons(mk_str("\n"), a); } )*
( NonblankIndentedLine { a = cons($$, a); } )+
{ $$ = mk_str_from_list(a, false); }
Verbatim = a:StartList ( VerbatimChunk { a = cons($$, a); } )+
{ $$ = mk_str_from_list(a, false);
$$->key = VERBATIM; }
HorizontalRule = NonindentSpace
( '*' Sp '*' Sp '*' (Sp '*')*
| '-' Sp '-' Sp '-' (Sp '-')*
| '_' Sp '_' Sp '_' (Sp '_')*)
Sp Newline BlankLine+
{ $$ = mk_element(HRULE); }
Bullet = !HorizontalRule NonindentSpace ('+' | '*' | '-') Spacechar+
BulletList = &Bullet (ListTight | ListLoose)
{ $$->key = BULLETLIST; }
ListTight = a:StartList
( ListItemTight { a = cons($$, a); } )+
BlankLine* !(Bullet | Enumerator)
{ $$ = mk_list(LIST, a); }
ListLoose = a:StartList
( b:ListItem BlankLine*
{ element *li;
li = b->children;
li->contents.str = realloc(li->contents.str, strlen(li->contents.str) + 3);
strcat(li->contents.str, "\n\n"); /* In loose list, \n\n added to end of each element */
a = cons(b, a);
} )+
{ $$ = mk_list(LIST, a); }
ListItem = ( Bullet | Enumerator )
a:StartList
ListBlock { a = cons($$, a); }
( ListContinuationBlock { a = cons($$, a); } )*
{ element *raw;
raw = mk_str_from_list(a, false);
raw->key = RAW;
$$ = mk_element(LISTITEM);
$$->children = raw;
}
ListItemTight =
( Bullet | Enumerator )
a:StartList
ListBlock { a = cons($$, a); }
( !BlankLine
ListContinuationBlock { a = cons($$, a); } )*
!ListContinuationBlock
{ element *raw;
raw = mk_str_from_list(a, false);
raw->key = RAW;
$$ = mk_element(LISTITEM);
$$->children = raw;
}
ListBlock = a:StartList
!BlankLine Line { a = cons($$, a); }
( ListBlockLine { a = cons($$, a); } )*
{ $$ = mk_str_from_list(a, false); }
ListContinuationBlock = a:StartList
( < BlankLine* >
{ if (strlen(yytext) == 0)
a = cons(mk_str("\001"), a); /* block separator */
else
a = cons(mk_str(yytext), a); } )
( Indent ListBlock { a = cons($$, a); } )+
{ $$ = mk_str_from_list(a, false); }
Enumerator = NonindentSpace [0-9]+ '.' Spacechar+
OrderedList = &Enumerator (ListTight | ListLoose)
{ $$->key = ORDEREDLIST; }
ListBlockLine = !BlankLine
!( Indent? (Bullet | Enumerator) )
!HorizontalRule
OptionallyIndentedLine
# Parsers for different kinds of block-level HTML content.
# This is repetitive due to constraints of PEG grammar.
HtmlBlockOpenAddress = '<' Spnl ("address" | "ADDRESS") Spnl HtmlAttribute* '>'
HtmlBlockCloseAddress = '<' Spnl '/' ("address" | "ADDRESS") Spnl '>'
HtmlBlockAddress = HtmlBlockOpenAddress (HtmlBlockAddress | !HtmlBlockCloseAddress .)* HtmlBlockCloseAddress
HtmlBlockOpenBlockquote = '<' Spnl ("blockquote" | "BLOCKQUOTE") Spnl HtmlAttribute* '>'
HtmlBlockCloseBlockquote = '<' Spnl '/' ("blockquote" | "BLOCKQUOTE") Spnl '>'
HtmlBlockBlockquote = HtmlBlockOpenBlockquote (HtmlBlockBlockquote | !HtmlBlockCloseBlockquote .)* HtmlBlockCloseBlockquote
HtmlBlockOpenCenter = '<' Spnl ("center" | "CENTER") Spnl HtmlAttribute* '>'
HtmlBlockCloseCenter = '<' Spnl '/' ("center" | "CENTER") Spnl '>'
HtmlBlockCenter = HtmlBlockOpenCenter (HtmlBlockCenter | !HtmlBlockCloseCenter .)* HtmlBlockCloseCenter
HtmlBlockOpenDir = '<' Spnl ("dir" | "DIR") Spnl HtmlAttribute* '>'
HtmlBlockCloseDir = '<' Spnl '/' ("dir" | "DIR") Spnl '>'
HtmlBlockDir = HtmlBlockOpenDir (HtmlBlockDir | !HtmlBlockCloseDir .)* HtmlBlockCloseDir
HtmlBlockOpenDiv = '<' Spnl ("div" | "DIV") Spnl HtmlAttribute* '>'
HtmlBlockCloseDiv = '<' Spnl '/' ("div" | "DIV") Spnl '>'
HtmlBlockDiv = HtmlBlockOpenDiv (HtmlBlockDiv | !HtmlBlockCloseDiv .)* HtmlBlockCloseDiv
HtmlBlockOpenDl = '<' Spnl ("dl" | "DL") Spnl HtmlAttribute* '>'
HtmlBlockCloseDl = '<' Spnl '/' ("dl" | "DL") Spnl '>'
HtmlBlockDl = HtmlBlockOpenDl (HtmlBlockDl | !HtmlBlockCloseDl .)* HtmlBlockCloseDl
HtmlBlockOpenFieldset = '<' Spnl ("fieldset" | "FIELDSET") Spnl HtmlAttribute* '>'
HtmlBlockCloseFieldset = '<' Spnl '/' ("fieldset" | "FIELDSET") Spnl '>'
HtmlBlockFieldset = HtmlBlockOpenFieldset (HtmlBlockFieldset | !HtmlBlockCloseFieldset .)* HtmlBlockCloseFieldset
HtmlBlockOpenForm = '<' Spnl ("form" | "FORM") Spnl HtmlAttribute* '>'
HtmlBlockCloseForm = '<' Spnl '/' ("form" | "FORM") Spnl '>'
HtmlBlockForm = HtmlBlockOpenForm (HtmlBlockForm | !HtmlBlockCloseForm .)* HtmlBlockCloseForm
HtmlBlockOpenH1 = '<' Spnl ("h1" | "H1") Spnl HtmlAttribute* '>'
HtmlBlockCloseH1 = '<' Spnl '/' ("h1" | "H1") Spnl '>'
HtmlBlockH1 = HtmlBlockOpenH1 (HtmlBlockH1 | !HtmlBlockCloseH1 .)* HtmlBlockCloseH1
HtmlBlockOpenH2 = '<' Spnl ("h2" | "H2") Spnl HtmlAttribute* '>'
HtmlBlockCloseH2 = '<' Spnl '/' ("h2" | "H2") Spnl '>'
HtmlBlockH2 = HtmlBlockOpenH2 (HtmlBlockH2 | !HtmlBlockCloseH2 .)* HtmlBlockCloseH2
HtmlBlockOpenH3 = '<' Spnl ("h3" | "H3") Spnl HtmlAttribute* '>'
HtmlBlockCloseH3 = '<' Spnl '/' ("h3" | "H3") Spnl '>'
HtmlBlockH3 = HtmlBlockOpenH3 (HtmlBlockH3 | !HtmlBlockCloseH3 .)* HtmlBlockCloseH3
HtmlBlockOpenH4 = '<' Spnl ("h4" | "H4") Spnl HtmlAttribute* '>'
HtmlBlockCloseH4 = '<' Spnl '/' ("h4" | "H4") Spnl '>'
HtmlBlockH4 = HtmlBlockOpenH4 (HtmlBlockH4 | !HtmlBlockCloseH4 .)* HtmlBlockCloseH4
HtmlBlockOpenH5 = '<' Spnl ("h5" | "H5") Spnl HtmlAttribute* '>'
HtmlBlockCloseH5 = '<' Spnl '/' ("h5" | "H5") Spnl '>'
HtmlBlockH5 = HtmlBlockOpenH5 (HtmlBlockH5 | !HtmlBlockCloseH5 .)* HtmlBlockCloseH5
HtmlBlockOpenH6 = '<' Spnl ("h6" | "H6") Spnl HtmlAttribute* '>'
HtmlBlockCloseH6 = '<' Spnl '/' ("h6" | "H6") Spnl '>'
HtmlBlockH6 = HtmlBlockOpenH6 (HtmlBlockH6 | !HtmlBlockCloseH6 .)* HtmlBlockCloseH6
HtmlBlockOpenMenu = '<' Spnl ("menu" | "MENU") Spnl HtmlAttribute* '>'
HtmlBlockCloseMenu = '<' Spnl '/' ("menu" | "MENU") Spnl '>'
HtmlBlockMenu = HtmlBlockOpenMenu (HtmlBlockMenu | !HtmlBlockCloseMenu .)* HtmlBlockCloseMenu
HtmlBlockOpenNoframes = '<' Spnl ("noframes" | "NOFRAMES") Spnl HtmlAttribute* '>'
HtmlBlockCloseNoframes = '<' Spnl '/' ("noframes" | "NOFRAMES") Spnl '>'
HtmlBlockNoframes = HtmlBlockOpenNoframes (HtmlBlockNoframes | !HtmlBlockCloseNoframes .)* HtmlBlockCloseNoframes
HtmlBlockOpenNoscript = '<' Spnl ("noscript" | "NOSCRIPT") Spnl HtmlAttribute* '>'
HtmlBlockCloseNoscript = '<' Spnl '/' ("noscript" | "NOSCRIPT") Spnl '>'
HtmlBlockNoscript = HtmlBlockOpenNoscript (HtmlBlockNoscript | !HtmlBlockCloseNoscript .)* HtmlBlockCloseNoscript
HtmlBlockOpenOl = '<' Spnl ("ol" | "OL") Spnl HtmlAttribute* '>'
HtmlBlockCloseOl = '<' Spnl '/' ("ol" | "OL") Spnl '>'
HtmlBlockOl = HtmlBlockOpenOl (HtmlBlockOl | !HtmlBlockCloseOl .)* HtmlBlockCloseOl
HtmlBlockOpenP = '<' Spnl ("p" | "P") Spnl HtmlAttribute* '>'
HtmlBlockCloseP = '<' Spnl '/' ("p" | "P") Spnl '>'
HtmlBlockP = HtmlBlockOpenP (HtmlBlockP | !HtmlBlockCloseP .)* HtmlBlockCloseP
HtmlBlockOpenPre = '<' Spnl ("pre" | "PRE") Spnl HtmlAttribute* '>'
HtmlBlockClosePre = '<' Spnl '/' ("pre" | "PRE") Spnl '>'
HtmlBlockPre = HtmlBlockOpenPre (HtmlBlockPre | !HtmlBlockClosePre .)* HtmlBlockClosePre
HtmlBlockOpenTable = '<' Spnl ("table" | "TABLE") Spnl HtmlAttribute* '>'
HtmlBlockCloseTable = '<' Spnl '/' ("table" | "TABLE") Spnl '>'
HtmlBlockTable = HtmlBlockOpenTable (HtmlBlockTable | !HtmlBlockCloseTable .)* HtmlBlockCloseTable
HtmlBlockOpenUl = '<' Spnl ("ul" | "UL") Spnl HtmlAttribute* '>'
HtmlBlockCloseUl = '<' Spnl '/' ("ul" | "UL") Spnl '>'
HtmlBlockUl = HtmlBlockOpenUl (HtmlBlockUl | !HtmlBlockCloseUl .)* HtmlBlockCloseUl
HtmlBlockOpenDd = '<' Spnl ("dd" | "DD") Spnl HtmlAttribute* '>'
HtmlBlockCloseDd = '<' Spnl '/' ("dd" | "DD") Spnl '>'
HtmlBlockDd = HtmlBlockOpenDd (HtmlBlockDd | !HtmlBlockCloseDd .)* HtmlBlockCloseDd
HtmlBlockOpenDt = '<' Spnl ("dt" | "DT") Spnl HtmlAttribute* '>'
HtmlBlockCloseDt = '<' Spnl '/' ("dt" | "DT") Spnl '>'
HtmlBlockDt = HtmlBlockOpenDt (HtmlBlockDt | !HtmlBlockCloseDt .)* HtmlBlockCloseDt
HtmlBlockOpenFrameset = '<' Spnl ("frameset" | "FRAMESET") Spnl HtmlAttribute* '>'
HtmlBlockCloseFrameset = '<' Spnl '/' ("frameset" | "FRAMESET") Spnl '>'
HtmlBlockFrameset = HtmlBlockOpenFrameset (HtmlBlockFrameset | !HtmlBlockCloseFrameset .)* HtmlBlockCloseFrameset
HtmlBlockOpenLi = '<' Spnl ("li" | "LI") Spnl HtmlAttribute* '>'
HtmlBlockCloseLi = '<' Spnl '/' ("li" | "LI") Spnl '>'
HtmlBlockLi = HtmlBlockOpenLi (HtmlBlockLi | !HtmlBlockCloseLi .)* HtmlBlockCloseLi
HtmlBlockOpenTbody = '<' Spnl ("tbody" | "TBODY") Spnl HtmlAttribute* '>'
HtmlBlockCloseTbody = '<' Spnl '/' ("tbody" | "TBODY") Spnl '>'
HtmlBlockTbody = HtmlBlockOpenTbody (HtmlBlockTbody | !HtmlBlockCloseTbody .)* HtmlBlockCloseTbody
HtmlBlockOpenTd = '<' Spnl ("td" | "TD") Spnl HtmlAttribute* '>'
HtmlBlockCloseTd = '<' Spnl '/' ("td" | "TD") Spnl '>'
HtmlBlockTd = HtmlBlockOpenTd (HtmlBlockTd | !HtmlBlockCloseTd .)* HtmlBlockCloseTd
HtmlBlockOpenTfoot = '<' Spnl ("tfoot" | "TFOOT") Spnl HtmlAttribute* '>'
HtmlBlockCloseTfoot = '<' Spnl '/' ("tfoot" | "TFOOT") Spnl '>'
HtmlBlockTfoot = HtmlBlockOpenTfoot (HtmlBlockTfoot | !HtmlBlockCloseTfoot .)* HtmlBlockCloseTfoot
HtmlBlockOpenTh = '<' Spnl ("th" | "TH") Spnl HtmlAttribute* '>'
HtmlBlockCloseTh = '<' Spnl '/' ("th" | "TH") Spnl '>'
HtmlBlockTh = HtmlBlockOpenTh (HtmlBlockTh | !HtmlBlockCloseTh .)* HtmlBlockCloseTh
HtmlBlockOpenThead = '<' Spnl ("thead" | "THEAD") Spnl HtmlAttribute* '>'
HtmlBlockCloseThead = '<' Spnl '/' ("thead" | "THEAD") Spnl '>'
HtmlBlockThead = HtmlBlockOpenThead (HtmlBlockThead | !HtmlBlockCloseThead .)* HtmlBlockCloseThead
HtmlBlockOpenTr = '<' Spnl ("tr" | "TR") Spnl HtmlAttribute* '>'
HtmlBlockCloseTr = '<' Spnl '/' ("tr" | "TR") Spnl '>'
HtmlBlockTr = HtmlBlockOpenTr (HtmlBlockTr | !HtmlBlockCloseTr .)* HtmlBlockCloseTr
HtmlBlockOpenScript = '<' Spnl ("script" | "SCRIPT") Spnl HtmlAttribute* '>'
HtmlBlockCloseScript = '<' Spnl '/' ("script" | "SCRIPT") Spnl '>'
HtmlBlockScript = HtmlBlockOpenScript (!HtmlBlockCloseScript .)* HtmlBlockCloseScript
HtmlBlockOpenHead = '<' Spnl ("head" | "HEAD") Spnl HtmlAttribute* '>'
HtmlBlockCloseHead = '<' Spnl '/' ("head" | "HEAD") Spnl '>'
HtmlBlockHead = HtmlBlockOpenHead (!HtmlBlockCloseHead .)* HtmlBlockCloseHead
HtmlBlockInTags = HtmlBlockAddress
| HtmlBlockBlockquote
| HtmlBlockCenter
| HtmlBlockDir
| HtmlBlockDiv
| HtmlBlockDl
| HtmlBlockFieldset
| HtmlBlockForm
| HtmlBlockH1
| HtmlBlockH2
| HtmlBlockH3
| HtmlBlockH4
| HtmlBlockH5
| HtmlBlockH6
| HtmlBlockMenu
| HtmlBlockNoframes
| HtmlBlockNoscript
| HtmlBlockOl
| HtmlBlockP
| HtmlBlockPre
| HtmlBlockTable
| HtmlBlockUl
| HtmlBlockDd
| HtmlBlockDt
| HtmlBlockFrameset
| HtmlBlockLi
| HtmlBlockTbody
| HtmlBlockTd
| HtmlBlockTfoot
| HtmlBlockTh
| HtmlBlockThead
| HtmlBlockTr
| HtmlBlockScript
| HtmlBlockHead
HtmlBlock = < ( HtmlBlockInTags | HtmlComment | HtmlBlockSelfClosing ) >
BlankLine+
{ if (extension(EXT_FILTER_HTML)) {
$$ = mk_list(LIST, NULL);
} else {
$$ = mk_str(yytext);
$$->key = HTMLBLOCK;
}
}
HtmlBlockSelfClosing = '<' Spnl HtmlBlockType Spnl HtmlAttribute* '/' Spnl '>'
HtmlBlockType = "address" | "blockquote" | "center" | "dir" | "div" | "dl" | "fieldset" | "form" | "h1" | "h2" | "h3" |
"h4" | "h5" | "h6" | "hr" | "isindex" | "menu" | "noframes" | "noscript" | "ol" | "p" | "pre" | "table" |
"ul" | "dd" | "dt" | "frameset" | "li" | "tbody" | "td" | "tfoot" | "th" | "thead" | "tr" | "script" |
"ADDRESS" | "BLOCKQUOTE" | "CENTER" | "DIR" | "DIV" | "DL" | "FIELDSET" | "FORM" | "H1" | "H2" | "H3" |
"H4" | "H5" | "H6" | "HR" | "ISINDEX" | "MENU" | "NOFRAMES" | "NOSCRIPT" | "OL" | "P" | "PRE" | "TABLE" |
"UL" | "DD" | "DT" | "FRAMESET" | "LI" | "TBODY" | "TD" | "TFOOT" | "TH" | "THEAD" | "TR" | "SCRIPT"
StyleOpen = '<' Spnl ("style" | "STYLE") Spnl HtmlAttribute* '>'
StyleClose = '<' Spnl '/' ("style" | "STYLE") Spnl '>'
InStyleTags = StyleOpen (!StyleClose .)* StyleClose
StyleBlock = < InStyleTags >
BlankLine*
{ if (extension(EXT_FILTER_STYLES)) {
$$ = mk_list(LIST, NULL);
} else {
$$ = mk_str(yytext);
$$->key = HTMLBLOCK;
}
}
CodeBlock = &{ extension(EXT_CODEBLOCK) }
"~~~" Newline < (!(Newline "~~~") .)* > Newline "~~~" BlankLine*
{ $$ = mk_str(yytext);
$$->key = VERBATIM;
}
Inlines = a:StartList ( !Endline Inline { a = cons($$, a); }
| c:Endline &Inline { a = cons(c, a); } )+ Endline?
{ $$ = mk_list(LIST, a); }
Inline = Endline
| UlOrStarLine
| Smart
| Space
| Hashtag
| Username
| Strong
| Emph
| Strike
| Image
| Link
| Str
| NoteReference
| InlineNote
| Code
| RawHtml
| Entity
| EscapedChar
| Symbol
Space = Spacechar+
{ $$ = mk_str(" ");
$$->key = SPACE; }
Str = a:StartList < NormalChar+ > { a = cons(mk_str(yytext), a); }
( StrChunk { a = cons($$, a); } )*
{ if (a->next == NULL) { $$ = a; } else { $$ = mk_list(LIST, a); } }
StrChunk = < (NormalChar | '_'+ &Alphanumeric | '#'+ &Alphanumeric | '@'+ &Alphanumeric)+ > { $$ = mk_str(yytext); } |
AposChunk
AposChunk = &{ extension(EXT_SMART) } '\'' &Alphanumeric
{ $$ = mk_element(APOSTROPHE); }
EscapedChar = '\\' !Newline < [-\\`|*_{}[\]()#+.!><] >
{ $$ = mk_str(yytext); }
Entity = ( HexEntity | DecEntity | CharEntity )
{ $$ = mk_str(yytext); $$->key = HTML; }
Endline = LineBreak | TerminalEndline | NormalEndline
NormalEndline = Sp Newline !BlankLine !'>' !AtxStart
!(Line ('='+ | '-'+) Newline)
{ $$ = mk_str("\n");
$$->key = SPACE; }
TerminalEndline = Sp Newline Eof
{ $$ = NULL; }
LineBreak = ( " " NormalEndline | &{ extension(EXT_HARD_WRAP) } NormalEndline )
{ $$ = mk_element(LINEBREAK); }
Symbol = < SpecialChar >
{ $$ = mk_str(yytext); }
# This keeps the parser from getting bogged down on long strings of '*' or '_',
# or strings of '*' or '_' with space on each side:
UlOrStarLine = (UlLine | StarLine) { $$ = mk_str(yytext); }
StarLine = < "****" '*'* > | < Spacechar '*'+ &Spacechar >
UlLine = < "____" '_'* > | < Spacechar '_'+ &Spacechar >
Emph = EmphStar | EmphUl
Whitespace = Spacechar | Newline
EmphStar = '*' !Whitespace
a:StartList
( !'*' b:Inline { a = cons(b, a); }
| b:StrongStar { a = cons(b, a); }
)+
'*'
{ $$ = mk_list(EMPH, a); }
EmphUl = '_' !Whitespace
a:StartList
( !'_' b:Inline { a = cons(b, a); }
| b:StrongUl { a = cons(b, a); }
)+
'_'
{ $$ = mk_list(EMPH, a); }
Strong = StrongStar | StrongUl
StrongStar = "**" !Whitespace
a:StartList
( !"**" b:Inline { a = cons(b, a); })+
"**"
{ $$ = mk_list(STRONG, a); }
StrongUl = "__" !Whitespace
a:StartList
( !"__" b:Inline { a = cons(b, a); })+
"__"
{ $$ = mk_list(STRONG, a); }
Strike = &{ extension(EXT_STRIKE) }
"~~" !Whitespace
a:StartList
( !"~~" b:Inline { a = cons(b, a); })+
"~~"
{ $$ = mk_list(STRIKE, a); }
HashtagRegular = < '#' (!SpecialChar !',' !'.' !'$' !'@' !':' !';' Nonspacechar | '_' | '-' )+ >
{ $$ = mk_str(yytext); $$->key = HASHTAG; }
HashtagLink = '#' '[' < ( !']' . )+ > ']' '(' ( !')' . )+ ')'
{ char *tag = malloc(strlen(yytext) + 1);
sprintf(tag, "#%s", yytext);
$$ = mk_str(tag);
$$->key = HASHTAG;
free(tag);
}
Hashtag = &{ extension(EXT_HASHTAGS) }
HashtagLink | HashtagRegular
Username = &{ extension(EXT_USERNAMES) }
< '@' (('.' | '_' | '-' | '@' | AlphanumericAscii?) AlphanumericAscii+)+ >
{ $$ = mk_str(yytext); $$->key = USERNAME; }
Image = '!' ( ExplicitLink | ReferenceLink )
{ if ($$->key == LINK) {
if (!extension(EXT_NO_IMAGES)) {
$$->key = IMAGE;
}
} else {
element *result;
result = $$;
$$->children = cons(mk_str("!"), result->children);
} }
MediaLink = &{ extension(EXT_MEDIA) }
l:Label '(' Sp s1:Source Spnl s2:Source Sp ')'
{ $$ = mk_media(l->children, s1->contents.str, s2->contents.str);
free_element(s1);
free_element(s2);
free(l); }
Audio = &{ extension(EXT_MEDIA) }
NonindentSpace '~' MediaLink
{ if ($$->key == MEDIA) {
$$->key = AUDIO;
} else {
element *result;
result = $$;
$$->children = cons(mk_str("~"), result->children);
} }
Video = &{ extension(EXT_MEDIA) }
NonindentSpace '%' MediaLink
{ if ($$->key == MEDIA) {
$$->key = VIDEO;
} else {
element *result;
result = $$;
$$->children = cons(mk_str("~"), result->children);
} }
Link = ExplicitLink | ReferenceLink | AutoLink
ReferenceLink = ReferenceLinkDouble | ReferenceLinkSingle
ReferenceLinkDouble = a:Label < Spnl > !"[]" b:Label
{ link match;
if (find_reference(&match, b->children)) {
$$ = mk_link(a->children, match.url, match.title);
free(a);
free_element_list(b);
} else {
element *result;
result = mk_element(LIST);
result->children = cons(mk_str("["), cons(a, cons(mk_str("]"), cons(mk_str(yytext),
cons(mk_str("["), cons(b, mk_str("]")))))));
$$ = result;
}
}
ReferenceLinkSingle = a:Label < (Spnl "[]")? >
{ link match;
if (find_reference(&match, a->children)) {
$$ = mk_link(a->children, match.url, match.title);
free(a);
}
else {
element *result;
result = mk_element(LIST);
result->children = cons(mk_str("["), cons(a, cons(mk_str("]"), mk_str(yytext))));
$$ = result;
}
}
ExplicitLink = l:Label '(' Sp s:Source Spnl t:Title Sp ')'
{ $$ = mk_link(l->children, s->contents.str, t->contents.str);
free_element(s);
free_element(t);
free(l); }
Source = ( '<' < SourceContents > '>' | < SourceContents > )
{ $$ = mk_str(yytext); }
SourceContents = ( ( !'(' !')' !'>' Nonspacechar )+ | '(' SourceContents ')')*
Title = ( TitleSingle | TitleDouble | < "" > )
{ $$ = mk_str(yytext); }
TitleSingle = '\'' < ( !( '\'' Sp ( ')' | Newline ) ) . )* > '\''
TitleDouble = '"' < ( !( '"' Sp ( ')' | Newline ) ) . )* > '"'
AutoLink = AutoLinkUrl | AutoLinkEmail
UrlChar = ( !'(' !')' !']' !'>' !',' !'.' !Spacechar !Newline .)
NoTrailingChar = UrlChar+ [,.]+ UrlChar | UrlChar
AutoLinkContents = (NoTrailingChar+ | '(' AutoLinkContents ')')*
AutoLinkUrl = ( '<' < [A-Za-z]+ "://" ( !Newline !'>' . )+ > '>'
| &{ extension(EXT_AUTOLINK) } !'[' < [A-Za-z]+ "://" AutoLinkContents > !']' )
{ $$ = mk_link(mk_str(yytext), yytext, ""); }
AutoLinkEmail = '<' ( "mailto:" )? < [-A-Za-z0-9+_./!%~$]+ '@' ( !Newline !'>' . )+ > '>'
{ char *mailto = malloc(strlen(yytext) + 8);
sprintf(mailto, "mailto:%s", yytext);
$$ = mk_link(mk_str(yytext), mailto, "");
free(mailto);
}
Reference = NonindentSpace !"[]" l:Label ':' Spnl s:RefSrc t:RefTitle BlankLine+
{ $$ = mk_link(l->children, s->contents.str, t->contents.str);
free_element(s);
free_element(t);
free(l);
$$->key = REFERENCE; }
Label = '[' ( !'^' &{ extension(EXT_NOTES) } | &. &{ !extension(EXT_NOTES) } )
a:StartList
( !']' Inline { a = cons($$, a); } )*
']'
{ $$ = mk_list(LIST, a); }
RefSrc = < Nonspacechar+ >
{ $$ = mk_str(yytext);
$$->key = HTML; }
RefTitle = ( RefTitleSingle | RefTitleDouble | RefTitleParens | EmptyTitle )
{ $$ = mk_str(yytext); }
EmptyTitle = < "" >
RefTitleSingle = Spnl '\'' < ( !( '\'' Sp Newline | Newline ) . )* > '\''
RefTitleDouble = Spnl '"' < ( !('"' Sp Newline | Newline) . )* > '"'
RefTitleParens = Spnl '(' < ( !(')' Sp Newline | Newline) . )* > ')'
References = a:StartList
( b:Reference { a = cons(b, a); } | SkipBlock )*
{ references = reverse(a); }
Ticks1 = "`" !'`'
Ticks2 = "``" !'`'
Ticks3 = "```" !'`'
Ticks4 = "````" !'`'
Ticks5 = "`````" !'`'
Code = ( Ticks1 Sp < ( ( !'`' Nonspacechar )+ | !Ticks1 '`'+ | !( Sp Ticks1 ) ( Spacechar | Newline !BlankLine ) )+ > Sp Ticks1
| Ticks2 Sp < ( ( !'`' Nonspacechar )+ | !Ticks2 '`'+ | !( Sp Ticks2 ) ( Spacechar | Newline !BlankLine ) )+ > Sp Ticks2
| Ticks3 Sp < ( ( !'`' Nonspacechar )+ | !Ticks3 '`'+ | !( Sp Ticks3 ) ( Spacechar | Newline !BlankLine ) )+ > Sp Ticks3
| Ticks4 Sp < ( ( !'`' Nonspacechar )+ | !Ticks4 '`'+ | !( Sp Ticks4 ) ( Spacechar | Newline !BlankLine ) )+ > Sp Ticks4
| Ticks5 Sp < ( ( !'`' Nonspacechar )+ | !Ticks5 '`'+ | !( Sp Ticks5 ) ( Spacechar | Newline !BlankLine ) )+ > Sp Ticks5
)
{ $$ = mk_str(yytext); $$->key = CODE; }
RawHtml = < (HtmlComment | HtmlBlockScript | HtmlTag) >
{ if (extension(EXT_FILTER_HTML)) {
$$ = mk_list(LIST, NULL);
} else {
$$ = mk_str(yytext);
$$->key = HTML;
}
}
BlankLine = Sp Newline
Quoted = '"' (!'"' .)* '"' | '\'' (!'\'' .)* '\''
HtmlAttribute = (AlphanumericAscii | '-')+ Spnl ('=' Spnl (Quoted | (!'>' Nonspacechar)+))? Spnl
HtmlComment = "<!--" (!"-->" .)* "-->"
HtmlTag = '<' Spnl '/'? AlphanumericAscii+ Spnl HtmlAttribute* '/'? Spnl '>'
Eof = !.
Spacechar = ' ' | '\t' | '\302' '\240'
Nonspacechar = !Spacechar !Newline .
Newline = '\n' | '\r' '\n'?
Sp = Spacechar*
Spnl = Sp (Newline Sp)?
SpecialChar = '~' | '*' | '_' | '`' | '&' | '[' | ']' | '(' | ')' | '<' | '!' | '#' | '\\' | '\'' | '"' | ExtendedSpecialChar
NormalChar = !( SpecialChar | Spacechar | Newline ) .
Alphanumeric = [0-9A-Za-z] | '\200' | '\201' | '\202' | '\203' | '\204' | '\205' | '\206' | '\207' | '\210' | '\211' | '\212' | '\213' | '\214' | '\215' | '\216' | '\217' | '\220' | '\221' | '\222' | '\223' | '\224' | '\225' | '\226' | '\227' | '\230' | '\231' | '\232' | '\233' | '\234' | '\235' | '\236' | '\237' | '\241' | '\242' | '\243' | '\244' | '\245' | '\246' | '\247' | '\250' | '\251' | '\252' | '\253' | '\254' | '\255' | '\256' | '\257' | '\260' | '\261' | '\262' | '\263' | '\264' | '\265' | '\266' | '\267' | '\270' | '\271' | '\272' | '\273' | '\274' | '\275' | '\276' | '\277' | '\300' | '\301' | '\302' | '\303' | '\304' | '\305' | '\306' | '\307' | '\310' | '\311' | '\312' | '\313' | '\314' | '\315' | '\316' | '\317' | '\320' | '\321' | '\322' | '\323' | '\324' | '\325' | '\326' | '\327' | '\330' | '\331' | '\332' | '\333' | '\334' | '\335' | '\336' | '\337' | '\340' | '\341' | '\342' | '\343' | '\344' | '\345' | '\346' | '\347' | '\350' | '\351' | '\352' | '\353' | '\354' | '\355' | '\356' | '\357' | '\360' | '\361' | '\362' | '\363' | '\364' | '\365' | '\366' | '\367' | '\370' | '\371' | '\372' | '\373' | '\374' | '\375' | '\376' | '\377'
AlphanumericAscii = [A-Za-z0-9]
Digit = [0-9]
BOM = "\357\273\277"
HexEntity = < '&' '#' [Xx] [0-9a-fA-F]+ ';' >
DecEntity = < '&' '#' [0-9]+ > ';' >
CharEntity = < '&' [A-Za-z0-9]+ ';' >
NonindentSpace = " " | " " | " " | ""
Indent = "\t" | " "
IndentedLine = Indent Line
OptionallyIndentedLine = Indent? Line
# StartList starts a list data structure that can be added to with cons:
StartList = &.
{ $$ = NULL; }
Line = RawLine
{ $$ = mk_str(yytext); }
RawLine = ( < (!'\r' !'\n' .)* Newline > | < .+ > Eof )
SkipBlock = HtmlBlock
| ( !'#' !SetextBottom1 !SetextBottom2 !BlankLine RawLine )+ BlankLine*
| BlankLine+
| RawLine
# Syntax extensions
ExtendedSpecialChar = &{ extension(EXT_SMART) } ('.' | '-' | '\'' | '"')
| &{ extension(EXT_NOTES) } ( '^' )
Smart = &{ extension(EXT_SMART) }
( Ellipsis | Dash | SingleQuoted | DoubleQuoted | Apostrophe | EnSpace )
Apostrophe = '\''
{ $$ = mk_element(APOSTROPHE); }
Ellipsis = ("..." | ". . .")
{ $$ = mk_element(ELLIPSIS); }
Dash = EmDash | EnDash
EnDash = '-' &Digit
{ $$ = mk_element(ENDASH); }
EmDash = ("---" | "--")
{ $$ = mk_element(EMDASH); }
EnSpace = " "
{ $$ = mk_element(ENSPACE); }
SingleQuoteStart = '\'' !(Spacechar | Newline)
SingleQuoteEnd = '\'' !Alphanumeric
SingleQuoted = SingleQuoteStart
a:StartList
( !SingleQuoteEnd b:Inline { a = cons(b, a); } )+
SingleQuoteEnd
{ $$ = mk_list(SINGLEQUOTED, a); }
DoubleQuoteStart = '"'
DoubleQuoteEnd = '"'
DoubleQuoted = DoubleQuoteStart
a:StartList
( !DoubleQuoteEnd b:Inline { a = cons(b, a); } )+
DoubleQuoteEnd
{ $$ = mk_list(DOUBLEQUOTED, a); }
NoteReference = &{ extension(EXT_NOTES) }
ref:RawNoteReference
{ element *match;
if (find_note(&match, ref->contents.str)) {
$$ = mk_element(NOTE);
assert(match->children != NULL);
$$->children = match->children;
$$->contents.str = 0;
} else {
char *s;
s = malloc(strlen(ref->contents.str) + 4);
sprintf(s, "[^%s]", ref->contents.str);
$$ = mk_str(s);
free(s);
}
}
RawNoteReference = "[^" < ( !Newline !']' . )+ > ']'
{ $$ = mk_str(yytext); }
Note = &{ extension(EXT_NOTES) }
NonindentSpace ref:RawNoteReference ':' Sp
a:StartList
( RawNoteBlock { a = cons($$, a); } )
( &Indent RawNoteBlock { a = cons($$, a); } )*
{ $$ = mk_list(NOTE, a);
$$->contents.str = strdup(ref->contents.str);
}
InlineNote = &{ extension(EXT_NOTES) }
"^["
a:StartList
( !']' Inline { a = cons($$, a); } )+
']'
{ $$ = mk_list(NOTE, a);
$$->contents.str = 0; }
Notes = a:StartList
( b:Note { a = cons(b, a); } | SkipBlock )*
{ notes = reverse(a); }
RawNoteBlock = a:StartList
( !BlankLine OptionallyIndentedLine { a = cons($$, a); } )+
( < BlankLine* > { a = cons(mk_str(yytext), a); } )
{ $$ = mk_str_from_list(a, true);
$$->key = RAW;
}
%%