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parser.leg
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%{
/* Original C version https://github.com/jgm/peg-markdown/
* Copyright 2008 John MacFarlane (jgm at berkeley dot edu).
*
* Modifications and translation from C into Go
* based on markdown_parser.leg and utility_functions.c
* Copyright 2010 Michael Teichgräber (mt at wmipf dot de)
*
* 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.
*/
package rst
// PEG grammar and parser actions for restructuredtext syntax.
import (
"fmt"
"io"
"log"
"strings"
)
const (
parserIfaceVersion_18 = iota
)
// Semantic value of a parsing action.
type element struct {
key int
contents
children *element
next *element
}
// Information (label, URL and title) for a link.
type link struct {
label *element
url string
title string
}
// code contents
type code struct {
lang string
}
// Union for contents of an Element (string, list, code, or link).
type contents struct {
str string
*link
*code
}
// Types of semantic values returned by parsers.
const (
LIST = iota /* A generic list of values. For ordered and bullet lists, see below. */
RAW /* Raw markdown to be processed further */
SPACE
LINEBREAK
ELLIPSIS
EMDASH
ENDASH
APOSTROPHE
SINGLEQUOTED
DOUBLEQUOTED
STR
LINK
IMAGE
CODE
HTML
EMPH
STRONG
STRIKE
PLAIN
PARA
LISTITEM
BULLETLIST
ORDEREDLIST
H1TITLE
H1 /* Code assumes that H1..6 are in order. */
H2
H3
H4
H5
H6
TABLE
TABLESEPARATOR
TABLECELL
CELLSPAN
TABLEROW
TABLEBODY
TABLEHEAD
CODEBLOCK
BLOCKQUOTE
VERBATIM
HTMLBLOCK
HRULE
REFERENCE
NOTE
DEFINITIONLIST
DEFTITLE
DEFDATA
numVAL
)
type state struct {
extension Extensions
heap elemHeap
tree *element /* Results of parse. */
references *element /* List of link references found. */
notes *element /* List of footnotes found. */
}
%}
%userstate state
%noexport
%YYSTYPE *element
Doc = a:StartList ( Block { a = cons($$, a) } )*
{ p.tree = reverse(a) }
commit
Docblock = Block { p.tree = $$ } commit
Block = BlankLine*
( BlockQuote
| Verbatim
| Image
| CodeBlock
| DoctestBlock
| Note
| Reference
| HorizontalRule
| HeadingTitle
| Heading
| Table
| DefinitionList
| OrderedList
| BulletList
| HtmlBlock
| StyleBlock
| Para
| Plain )
Para = NonindentSpace a:Inlines BlankLine+
{ $$ = a; $$.key = PARA }
Plain = a:Inlines
{ $$ = a; $$.key = PLAIN }
SetextBottom = ( '=' | '-' | '*' | '^' | '~' )+ Newline
HeadingTitle = &(SetextBottom RawLine SetextBottom)
SetextBottom
a:StartList ( !Endline Inline { a = cons($$, a) } )+ Sp Newline
SetextBottom { $$ = p.mkList(H1TITLE, a) }
Heading = &(RawLine SetextBottom)
a:StartList ( !Endline Inline { a = cons($$, a) } )+ Sp Newline
SetextBottom { $$ = p.mkList(getHeadingElm(string(yytext[0])), a) }
Image = NonindentSpace
".. image:: " l:Source BlankLine
( ( Sp ":alt:" Sp a:RefSource BlankLine )
| ( Sp ":target:" Sp t:Source BlankLine )
| ( Sp ":align:" Sp g:Source BlankLine ) )*
{
tt := p.mkElem(LIST)
title := ""
if (a != nil && a.contents.str != "") {
title = a.contents.str
}
tt = p.mkLink(p.mkString(l.contents.str), l.contents.str, title)
tt.key = IMAGE
if (t != nil) {
gg := p.mkLink(p.mkString(t.contents.str), t.contents.str, "")
gg.children = tt
$$ = gg
} else {
$$ = tt
$$.children = nil
}
a = nil
t = nil
g = nil
l = nil
}
CodeBlock = NonindentSpace
".. code" "-block"? ":: " l:Source BlankLine
Newline
a:StartList
( VerbatimChunk { a = cons($$, a) } )+
{
$$ = p.mkCodeBlock(a, l.contents.str)
l = nil
}
DoctestBlock = a:StartList
(( DoctestLine { a = cons($$, a) } )+
( !'>' !BlankLine Line { a = cons($$, a) } )*
)+
{
$$ = p.mkCodeBlock(a, "python")
}
BlockQuoteRaw = ":" BlankLine
Newline
a:StartList
( NonblankIndentedLine { a = cons($$, a) } )+
{
$$ = p.mkStringFromList(a, true)
$$.key = RAW
}
BlockQuoteChunk = !"::" ":" BlankLine
Newline
a:StartList
( BlankLine { a = cons(p.mkString("\n"), a) } )*
( NonblankIndentedLine { a = cons($$, a) } )+
{ $$ = p.mkStringFromList(a, false) }
BlockQuote = a:StartList ( BlockQuoteChunk { a = cons($$, a) } )+
{ $$ = p.mkElem(BLOCKQUOTE)
$$.children = a }
NonblankIndentedLine = !BlankLine IndentedLine
VerbatimChunk = a:StartList
( BlankLine { a = cons(p.mkString("\n"), a) } )*
( NonblankIndentedLine { a = cons($$, a) } )+
{ $$ = p.mkStringFromList(a, false) }
Verbatim = a:StartList ( VerbatimChunk { a = cons($$, a) } )+
{ $$ = p.mkStringFromList(a, false)
$$.key = VERBATIM }
HorizontalRule = NonindentSpace
( '=' Sp '=' Sp '=' (Sp '=')*
| '-' Sp '-' Sp '-' (Sp '-')*
| '*' Sp '*' Sp '*' (Sp '*')*
| '^' Sp '^' Sp '^' (Sp '^')*
| '~' Sp '~' Sp '~' (Sp '~')*
| '_' Sp '_' Sp '_' (Sp '_')*)
Sp Newline BlankLine+
{ $$ = p.mkElem(HRULE) }
Table = GridTable | HeaderLessGridTable | SimpleTable
SimpleTable = "NotImplemented" "simpleTable"
GridTable = a:StartList
( GridTableHeader { $$.key = TABLEHEAD; a = cons($$, a) } )
( GridTableHeaderSep { a = $$ } )
( GridTableBody { a = cons($$, a) } )+
{
$$ = p.mkList(TABLE, a)
}
HeaderLessGridTable = a:StartList
( GridTableSep (GridTableBody { a = cons($$, a) } )+ )
{
$$ = p.mkList(TABLE, a)
}
GridTableHeader = Sp '+' ( '-'+ '+' )+ BlankLine
a:StartList
< ( GridTableRow { a = cons($$, a) } )+ >
{
$$ = p.mkList(TABLEBODY, a)
}
GridTableBody = a:StartList ( GridTableRow { a = cons($$, a) } GridTableSep )+
{ $$ = p.mkList(TABLEBODY, a);}
GridTableRow = Sp '|' Sp
a:StartList
( < TableCell > Sp '|'
{
// TODO: support inline text
raw := p.mkString(yytext)
raw.key = RAW
$$ = p.mkElem(TABLECELL)
$$.children = raw
a = cons($$, a)
} )+
BlankLine
{
$$ = p.mkList(TABLEROW, a)
}
TableCell = a:StartList
( ':' | '>' | '<' | '/' | '-' | Spacechar | EscapedChar | Alphanumeric )+
{
}
GridTableHeaderSep = Sp '+' ( '='+ '+' )+ BlankLine
GridTableSep = Sp '+' ( '-'+ '+' )+ BlankLine
Bullet = !HorizontalRule NonindentSpace ('+' | '*' | '-') Spacechar+
BulletList = &Bullet (ListTight | ListLoose)
{ $$.key = BULLETLIST }
ListTight = a:StartList
( ListItemTight { a = cons($$, a) } )+
BlankLine* !(Bullet | Enumerator | DefMarker)
{ $$ = p.mkList(LIST, a) }
ListLoose = a:StartList
( b:ListItem BlankLine*
{
li := b.children
li.contents.str += "\n\n"
a = cons(b, a)
} )+
{ $$ = p.mkList(LIST, a) }
ListItem = ( Bullet | Enumerator | DefMarker )
a:StartList
ListBlock { a = cons($$, a) }
( ListContinuationBlock { a = cons($$, a) } )*
{
raw := p.mkStringFromList(a, false)
raw.key = RAW
$$ = p.mkElem(LISTITEM)
$$.children = raw
}
ListItemTight =
( Bullet | Enumerator | DefMarker )
a:StartList
ListBlock { a = cons($$, a) }
( !BlankLine
ListContinuationBlock { a = cons($$, a) } )*
!ListContinuationBlock
{
raw := p.mkStringFromList(a, false)
raw.key = RAW
$$ = p.mkElem(LISTITEM)
$$.children = raw
}
ListBlock = a:StartList
!BlankLine Line { a = cons($$, a) }
( ListBlockLine { a = cons($$, a) } )*
{ $$ = p.mkStringFromList(a, false) }
ListContinuationBlock = a:StartList
( < BlankLine* >
{ if len(yytext) == 0 {
a = cons(p.mkString("\001"), a) // block separator
} else {
a = cons(p.mkString(yytext), a)
}
} )
( Indent ListBlock { a = cons($$, a) } )+
{ $$ = p.mkStringFromList(a, false) }
Enumerator = NonindentSpace ([0-9]+ | '#'+) '.' Spacechar+
OrderedList = &Enumerator (ListTight | ListLoose)
{ $$.key = ORDEREDLIST }
ListBlockLine = !BlankLine
!( (Indent? (Bullet | Enumerator)) | DefMarker )
!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 p.extension.FilterHTML {
$$ = p.mkList(LIST, nil)
} else {
$$ = p.mkString(yytext)
$$.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 p.extension.FilterStyles {
$$ = p.mkList(LIST, nil)
} else {
$$ = p.mkString(yytext)
$$.key = HTMLBLOCK
}
}
Inlines = a:StartList ( !Endline Inline { a = cons($$, a) }
| c:Endline &Inline { a = cons(c, a) } )+ Endline?
{
$$ = p.mkList(LIST, a)
}
Inline = Link
| Str
| Endline
| UlOrStarLine
| Space
| Strong
| Emph
| Strike
| NoteReference
| Footnote
#| Citation
| Code
| ApplicationDepent
| RawHtml
| Entity
| EscapedChar
| Smart
| Symbol
Space = Spacechar+
{ $$ = p.mkString(" ")
$$.key = SPACE }
Str = a:StartList < NormalChar+ > { a = cons(p.mkString(yytext), a) }
( StrChunk { a = cons($$, a) } )*
{ if a.next == nil { $$ = a; } else { $$ = p.mkList(LIST, a) } }
StrChunk = < (NormalChar | '_'+ &Alphanumeric)+ > { $$ = p.mkString(yytext) } |
AposChunk
AposChunk = &{ p.extension.Smart } '\'' &Alphanumeric
{ $$ = p.mkElem(APOSTROPHE) }
EscapedChar = '\\' !Newline < [-\\`|*_{}[\]()#+.!><] >
{ $$ = p.mkString(yytext) }
Entity = ( HexEntity | DecEntity | CharEntity )
{ $$ = p.mkString(yytext); $$.key = HTML }
Endline = LineBreak | TerminalEndline | NormalEndline
NormalEndline = Sp Newline !BlankLine !'>'
!(Line ('='+ | '-'+) Newline)
{ $$ = p.mkString("\n")
$$.key = SPACE }
TerminalEndline = Sp Newline Eof
{ $$ = nil }
LineBreak = " " NormalEndline
{ $$ = p.mkElem(LINEBREAK) }
Symbol = < SpecialChar >
{ $$ = p.mkString(yytext) }
ApplicationDepent = !"`_" !"``_" '`' !"``" a:QuotedRefSource '`' !"``" !"_"
{ $$ = p.mkString(yytext); a = nil }
# This keeps the parser from getting bogged down on long strings of '*' or '_',
# or strings of '*' or '_' with space on each side:
UlOrStarLine = (UlLine | StarLine) { $$ = p.mkString(yytext) }
StarLine = < "****" '*'* > | < Spacechar '*'+ &Spacechar >
UlLine = < "____" '_'* > | < Spacechar '_'+ &Spacechar >
Whitespace = Spacechar | Newline
Emph = '*' !Whitespace
a:StartList
( !'*' b:Inline { a = cons(b, a) } )+
'*'
{ $$ = p.mkList(EMPH, a) }
Strong = "**" !Whitespace
a:StartList
( !"**" b:Inline { a = cons(b, a) })+
"**"
{ $$ = p.mkList(STRONG, a) }
Strike = &{ p.extension.Strike }
"~~" !Whitespace
a:StartList
( !"~~" b:Inline { a = cons(b, a) } )+
"~~"
{ $$ = p.mkList(STRIKE, a) }
Link = ReferenceLink | ExplicitLink | AutoLink
ReferenceLink = UnquotedRefLinkUnderbar | QuotedRefLinkUnderbar
UnquotedRefLinkUnderbar = < a:UnquotedLinkSource > '_' ( !Alphanumeric )
{
if match, found := p.findReference(p.mkString(a.contents.str)); found {
$$ = p.mkLink(p.mkString(a.contents.str), match.url, match.title)
a = nil
} else {
$$ = p.mkLink(p.mkString(a.contents.str), "", "link is not found")
a = nil
}
}
QuotedRefLinkUnderbar = ( !"`_" !"``_" '`' !"``" ) a:QuotedRefSource ( '`' !"``" ) '_'
{
if match, found := p.findReference(p.mkString(a.contents.str)); found {
$$ = p.mkLink(p.mkString(yytext), match.url, match.title)
a = nil
} else {
result := p.mkElem(LIST)
result.children = cons(p.mkString(a.contents.str), cons(a, p.mkString(yytext)));
$$ = result
}
}
ExplicitLink = l:Label '(' Sp s:Source Spnl t:Title Sp ')'
{
$$ = p.mkLink(l.children, s.contents.str, t.contents.str)
s = nil
t = nil
l = nil
}
Source = ( < SourceContents > )
{ $$ = p.mkString(yytext) }
SourceContents = ( ( !'(' !')' !'>' Nonspacechar )+ | '(' SourceContents ')')*
Title = ( TitleSingle | TitleDouble | < "" > )
{ $$ = p.mkString(yytext) }
TitleSingle = '\'' < ( !( '\'' Sp ( ')' | Newline ) ) . )* > '\''
TitleDouble = '"' < ( !( '"' Sp ( ')' | Newline ) ) . )* > '"'
AutoLink = EmbeddedLink | AutoLinkUrl | AutoLinkEmail
EmbeddedLink = a:StartList '`' l:EmbeddedRefSource "<" < [A-Za-z]+ "://" ( !Newline !'>' . )+ > ">`_" '_'?
{
$$ = p.mkLink(p.mkString(l.contents.str), yytext, "")
}
AutoLinkUrl = < [A-Za-z]+ "://" ( !([.-_] Newline) !'. ' !Newline !'>' [-A-Za-z0-9_.'/?=] )+ >
{ $$ = p.mkLink(p.mkString(yytext), yytext, "") }
AutoLinkEmail = '<' ( "mailto:" )? < [-A-Za-z0-9+_./!%~$]+ '@' ( !Newline !'>' . )+ > '>'
{
$$ = p.mkLink(p.mkString(yytext), "mailto:"+yytext, "")
}
Reference = QuotedReference | UnquotedReference
QuotedReference = NonindentSpace
".. _`" !"``" c:QuotedRefSource !"``:" "`: " s:RefSrc BlankLine
{
$$ = p.mkLink(p.mkString(c.contents.str), s.contents.str, "")
s = nil
c = nil
$$.key = REFERENCE
}
UnquotedReference = NonindentSpace
".. _" c:RefSource ": " s:RefSrc BlankLine
{
$$ = p.mkLink(p.mkString(c.contents.str), s.contents.str, "")
s = nil
c = nil
$$.key = REFERENCE
}
UnquotedLinkSource = < ( ( !'_' !':' !'`' ( Nonspacechar ) )+ )* >
{ $$ = p.mkString(yytext) }
RefSource = < ( ( !'_' !':' !'`' ( ' ' | Nonspacechar ) )+ )* >
{ $$ = p.mkString(yytext) }
QuotedRefSource = < ( ( !':' !'`' ( ' ' | Nonspacechar ) )+ )* >
{ $$ = p.mkString(yytext) }
EmbeddedRefSource = < ( ( !'<' !':' !'`' ( ' ' | Nonspacechar | BlankLine ) )+ )* >
{ $$ = p.mkString(yytext) }
Label = '[' ( !'^' &{ p.extension.Notes } | &. &{ !p.extension.Notes } )
a:StartList
( !']' Inline { a = cons($$, a) } )*
']'
{
$$ = p.mkList(LIST, a)
}
RefSrc = < Nonspacechar+ >
{ $$ = p.mkString(yytext)
$$.key = HTML }
References = a:StartList
( b:Reference { a = cons(b, a) } | SkipBlock )*
{ p.references = reverse(a)
p.state.heap.hasGlobals = true
}
commit
Ticks2 = "``" !'`'
Code = Ticks2 <
( ( !'`' Nonspacechar )+ | '_' | !Ticks2 '`' | !( Sp Ticks2 ) ( Spacechar | Newline !BlankLine ) )+
> Ticks2
{ $$ = p.mkString(yytext); $$.key = CODE }
RawHtml = < (HtmlComment | HtmlBlockScript | HtmlTag) >
{ if p.extension.FilterHTML {
$$ = p.mkList(LIST, nil)
} else {
$$ = p.mkString(yytext)
$$.key = HTML
}
}
BlankLine = Sp Newline
Quoted = '"' (!'"' .)* '"' | '\'' (!'\'' .)* '\''
HtmlAttribute = (AlphanumericAscii | '-')+ Spnl ('=' Spnl (Quoted | (!'>' Nonspacechar)+))? Spnl
HtmlComment = "<!--" (!"-->" .)* "-->"
HtmlTag = '<' Spnl '/'? AlphanumericAscii+ Spnl HtmlAttribute* '/'? Spnl '>'
Eof = !.
Spacechar = ' ' | '\t'
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' | '\240' | '\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]
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 = &.
{ $$ = nil }
DoctestLine = ">>> " RawLine
{ $$ = p.mkString(">>> " + yytext) }
Line = RawLine
{ $$ = p.mkString(yytext) }
RawLine = ( < (!'\r' !'\n' .)* Newline > | < .+ > Eof )
SkipBlock = HtmlBlock
| ( !'#' !SetextBottom !BlankLine RawLine )+ BlankLine*
| BlankLine+
| RawLine
# Syntax extensions
ExtendedSpecialChar = &{ p.extension.Smart } ('.' | '-' | '\'' | '"')
| &{ p.extension.Notes } ( '^' )
Smart = &{ p.extension.Smart }
( Ellipsis | Dash | SingleQuoted | DoubleQuoted | Apostrophe )
Apostrophe = '\''
{ $$ = p.mkElem(APOSTROPHE) }
Ellipsis = ("..." | ". . .")
{ $$ = p.mkElem(ELLIPSIS) }
Dash = EmDash | EnDash
EnDash = '-' &Digit
{ $$ = p.mkElem(ENDASH) }
EmDash = ("---" | "--")
{ $$ = p.mkElem(EMDASH) }
SingleQuoteStart = '\'' !(Spacechar | Newline)
SingleQuoteEnd = '\'' !Alphanumeric
SingleQuoted = SingleQuoteStart
a:StartList
( !SingleQuoteEnd b:Inline { a = cons(b, a) } )+
SingleQuoteEnd
{ $$ = p.mkList(SINGLEQUOTED, a) }
DoubleQuoteStart = '"'
DoubleQuoteEnd = '"'
DoubleQuoted = DoubleQuoteStart
a:StartList
( !DoubleQuoteEnd b:Inline { a = cons(b, a) } )+
DoubleQuoteEnd
{ $$ = p.mkList(DOUBLEQUOTED, a) }
NoteReference = &{ p.extension.Notes }
ref:RawNoteReference
{
p.state.heap.hasGlobals = true
if match, ok := p.find_note(ref.contents.str); ok {
$$ = p.mkElem(NOTE)
$$.children = match.children
$$.contents.str = ""
} else {
$$ = p.mkString("[^"+ref.contents.str+"]")
}
}
RawNoteReference = "[^" < ( !Newline !']' . )+ > ']'
{ $$ = p.mkString(yytext) }
Note = &{ p.extension.Notes }
NonindentSpace ref:RawNoteReference ':' Sp
a:StartList
( RawNoteBlock { a = cons($$, a) } )
( &Indent RawNoteBlock { a = cons($$, a) } )*
{ $$ = p.mkList(NOTE, a)
$$.contents.str = ref.contents.str
}
#Citation = !"``" '`'
# a:StartList
# ( !']' Inline { a = cons($$, a) } )+
# !"``" '`'
# { $$ = p.mkList(NOTE, a)
# //p.state.heap.hasGlobals = true
# $$.contents.str = ""
# }
Footnote = "[#"
a:StartList
( !']' Inline { a = cons($$, a) } )+
"]_"
{
$$ = p.mkList(NOTE, a)
//p.state.heap.hasGlobals = true
$$.contents.str = ""
}
Notes = a:StartList
( b:Note { a = cons(b, a) } | SkipBlock )*
{ p.notes = reverse(a) }
commit
RawNoteBlock = a:StartList
( !BlankLine OptionallyIndentedLine { a = cons($$, a) } )+
( < BlankLine* > { a = cons(p.mkString(yytext), a) } )
{ $$ = p.mkStringFromList(a, true)
p.state.heap.hasGlobals = true
$$.key = RAW
}
DefinitionList = &{ p.extension.Dlists }
a:StartList
( Definition { a = cons($$, a) } )+
{ $$ = p.mkList(DEFINITIONLIST, a) }
Definition = &( (NonindentSpace !Defmark Nonspacechar RawLine) BlankLine? Defmark)
a:StartList
( DListTitle { a = cons($$, a) } )+
( DefTight | DefLoose ) {
for e := $$.children; e != nil; e = e.next {
e.key = DEFDATA
}
a = cons($$, a)
}
{ $$ = p.mkList(LIST, a) }
DListTitle = NonindentSpace !Defmark &Nonspacechar
a:StartList
(!Endline Inline { a = cons($$, a) } )+
Sp Newline
{ $$ = p.mkList(LIST, a)
$$.key = DEFTITLE
}
DefTight = &Defmark ListTight
DefLoose = BlankLine &Defmark ListLoose
Defmark = NonindentSpace (':' | '~') Spacechar+
DefMarker = &{ p.extension.Dlists } Defmark
%%
/*
* List manipulation functions
*/
/* cons - cons an element onto a list, returning pointer to new head
*/
func cons(new, list *element) *element {
new.next = list
return new
}
/* reverse - reverse a list, returning pointer to new list
*/
func reverse(list *element) (new *element) {
for list != nil {