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parser.pegjs
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/** PEGjs lexer/parser */
{
$this->tu = TexUtil::getInstance();
# get reference of the options for usage in functions.
# get reference of the options for usage in functions.
$this->options = ParserUtil::createOptions($options);
}
// first rule is the start production.
start
= _ t:tex_expr
{
assert($t instanceof TexArray);
return $t;
}
// the PEG grammar doesn't automatically ignore whitespace when tokenizing.
// so we add `_` productions in appropriate places to eat whitespace.
// Lexer rules (which are capitalized) are expected to always eat
// *trailing* whitespace. Leading whitespace is taken care of in the `start`
// rule above.
_
= [ \t\n\r]*
/////////////////////////////////////////////////////////////
// PARSER
//----------------------------------------------------------
tex_expr
= e:expr EOF
{ return $e; }
/ e1:ne_expr name:FUN_INFIX e2:ne_expr EOF
{ return new TexArray( new Infix($name, $e1, $e2)); }
expr
= ne_expr
/ ""
{ return new TexArray(); }
ne_expr
= h:lit_aq t:expr
{ return $t->unshift($h); }
/ h:litsq_aq t:expr
{ return $t->unshift($h); }
/ d:DECLh e:expr
{ return new TexArray(new Declh($d->getFname(), $e)); }
litsq_aq
= litsq_fq
/ litsq_dq
/ litsq_uq
/ litsq_zq
litsq_fq
= l1:litsq_dq SUP l2:lit
{ return new FQ($l1->getBase(), $l1->getDown(), $l2); }
/ l1:litsq_uq SUB l2:lit
{ return new FQ($l1->getBase(), $l2, $l1->getUp()); }
litsq_uq
= base:litsq_zq SUP upi:lit
{ return new UQ($base, $upi); }
litsq_dq
= base:litsq_zq SUB downi:lit
{ return new DQ($base, $downi); }
litsq_zq
= SQ_CLOSE
{ return new Literal( "]"); }
expr_nosqc
= l:lit_aq e:expr_nosqc
{ return $e ->unshift( $l ); }
/ "" /* */
{ return new TexArray(); }
lit_aq
= lit_fq
/ lit_dq
/ lit_uq
/ lit_dqn
/ lit_uqn
/ lit
lit_fq
= l1:lit_dq SUP l2:lit
{ return new FQ($l1->getBase(), $l1->getDown(), $l2); }
/ l1:lit_uq SUB l2:lit
{ return new FQ ($l1->getBase(), $l2, $l1->getUp()); }
/ l1:lit_dqn SUP l2:lit
{ return new FQ(new TexArray(), $l1->getDown(), $l2); }
lit_uq
= base:lit SUP upi:lit
{ return new UQ($base, $upi); }
lit_dq
= base:lit SUB downi:lit
{ return new DQ($base, $downi); }
lit_uqn
= SUP l:lit
{ return new UQ(new TexArray(),$l); }
lit_dqn
= SUB l:lit
{ return new DQ(new TexArray(),$l); }
left
= LEFTI d:DELIMITER
{ return $d; }
/ LEFTI SQ_CLOSE
{ return "]"; }
right
= RIGHTI d:DELIMITER
{ return $d; }
/ RIGHTI SQ_CLOSE
{ return "]"; }
lit
= r:LITERAL { return new Literal($r); }
/ f:generic_func &{ return $this->tu->latex_function_names($f); } _
c:( "(" / "[" / "\\{" / "" { return " ";}) _
{ return new TexArray( new Literal( $f ) , new Literal( $c ) ) ; }
// quasi-literal; this is from Texutil.find(...) but the result is not
// guaranteed to be Tex.LITERAL(...)
/ f:generic_func &{ return $this->tu->nullary_macro_aliase($f); } _ // from Texutil.find(...)
{
$parser = new Parser();
$ast = $parser->parse($this->tu->nullary_macro_aliase($f), $this->options);
assert($ast instanceof TexArray && $ast->getLength() === 1);
return $ast->first();
}
/ f:generic_func &{ return $this->tu->deprecated_nullary_macro_aliase($f); } _ // from Texutil.find(...)
{
$parser = new Parser();
$ast = $parser->parse($this->tu->deprecated_nullary_macro_aliase($f), $this->options);
assert($ast instanceof TexArray && $ast->getLength() === 1);
if ($this->options['oldtexvc']){
return $ast->first();
} else {
throw new SyntaxError("Deprecation: Alias no longer supported.", [], $this->text(), $this->offset(),
$this->line(), $this->column());
}
}
/ f:generic_func &{ return $this->tu->mediawiki_function_names($f); } _
{
if(is_array($f)) {
// This is an unexpected case, but covers the ambiguity of slice in javascript.
$fProcessed = implode(array_slice($f, 1));
} else {
$fProcessed = substr($f,1);
}
return new Fun1nb( '\\operatorname', new Literal( $fProcessed ) );
}
/ r:DELIMITER { return new Literal($r); }
/ b:BIG r:DELIMITER { return new Big($b, $r); }
/ b:BIG SQ_CLOSE { return new Big($b, "]"); }
/ l:left e:expr r:right {return new Lr($l, $r, $e); }
/ name:FUN_AR1opt e:expr_nosqc SQ_CLOSE l:lit /* must be before FUN_AR1 */
{ return new Fun2sq($name, $e->setCurly(), $l); }
/ name:FUN_AR1 l:lit { return new Fun1($name, $l); }
/ name:FUN_AR1nb l:lit { return new Fun1nb($name, $l); }
/ name:FUN_MHCHEM l:chem_lit { return new Mhchem($name, $l); }
/ name:FUN_AR2 l1:lit l2:lit { return new Fun2($name, $l1, $l2); }
/ name:FUN_AR4_MHCHEM_TEXIFIED l1:lit l2:lit l3:lit l4:lit { return new Fun4($name, $l1, $l2, $l3, $l4); }
/ name:FUN_AR2nb l1:lit l2:lit { return new Fun2nb($name, $l1, $l2); }
/ BOX
/ CURLY_OPEN e:expr CURLY_CLOSE
{ return $e->setCurly(); }
/ CURLY_OPEN e1:ne_expr name:FUN_INFIX e2:ne_expr CURLY_CLOSE
{ return new Infix($name, $e1, $e2); }
/ BEGIN_MATRIX m:(array/matrix) END_MATRIX
{ return $m->setTop( 'matrix' ); }
/ BEGIN_PMATRIX m:(array/matrix) END_PMATRIX
{ return $m->setTop( 'pmatrix' ); }
/ BEGIN_BMATRIX m:(array/matrix) END_BMATRIX
{ return $m->setTop( 'bmatrix' ); }
/ BEGIN_BBMATRIX m:(array/matrix) END_BBMATRIX
{ return $m->setTop( 'Bmatrix' ); }
/ BEGIN_VMATRIX m:(array/matrix) END_VMATRIX
{ return $m->setTop( 'vmatrix' ); }
/ BEGIN_VVMATRIX m:(array/matrix) END_VVMATRIX
{ return $m->setTop( 'Vmatrix' ); }
/ BEGIN_ARRAY opt_pos m:array END_ARRAY
{ return $m->setTop( 'array' ); }
/ BEGIN_ALIGN opt_pos m:matrix END_ALIGN
{ return $m->setTop( 'aligned' ); }
/ BEGIN_ALIGNED opt_pos m:matrix END_ALIGNED // parse what we emit
{ return $m->setTop( 'aligned' ); }
/ BEGIN_ALIGNAT m:alignat END_ALIGNAT
{ return $m->setTop( 'alignedat' ); }
/ BEGIN_ALIGNEDAT m:alignat END_ALIGNEDAT // parse what we emit
{ return $m->setTop( 'alignedat' ); }
/ BEGIN_SMALLMATRIX m:(array/matrix) END_SMALLMATRIX
{ return $m->setTop( 'smallmatrix' ); }
/ BEGIN_CASES m:matrix END_CASES
{ return $m->setTop( 'cases' ); }
/ "\\begin{" alpha+ "}" /* better error messages for unknown environments */
{ throw new SyntaxError("Illegal TeX function", [], $this->text(), $this->offset(),
$this->line(), $this->column()); }
/ f:generic_func &{ return !$this->tu->getAllFunctionsAt($f); }
{ throw new SyntaxError("Illegal TeX function", [], $f, $this->offset(), $this->line(), $this->column()); }
// "array" requires mandatory column specification
array
= cs:column_spec m:matrix
{ return $m->setColumnSpecs( $cs ); }
// "alignat" requires mandatory # of columns
alignat
= as:alignat_spec m:matrix
{ return $m->setColumnSpecs( $as ); }
// "matrix" does not require column specification
matrix
= l:line_start tail:( r:NEXT_ROW m:matrix { return [$m,$r]; } )?
{ if ($tail === null) { return new Matrix( 'matrix', new TexArray( $l ) ); }
return new Matrix( 'matrix', $tail[0]->unshift($l), $tail[1] ); }
line_start
= f:HLINE l:line_start
{
if ($l->first() === null ) {
$l->push(new TexArray());
}
$l->first()->unshift(new Literal($f . " ")); return $l;}
/ line
line
= e:expr tail:( NEXT_CELL l:line { return $l; } )?
{
if ($tail === null) { return new TexArray( $e ) ; }
return $tail->unshift($e);
}
column_spec
= CURLY_OPEN cs:(one_col+ { return $this->text(); }) CURLY_CLOSE
{ return TexArray::newCurly(new Literal($cs)); }
one_col
= [lrc] _
/ "p" CURLY_OPEN boxchars+ CURLY_CLOSE
/ "*" CURLY_OPEN [0-9]+ _ CURLY_CLOSE
( one_col
/ CURLY_OPEN one_col+ CURLY_CLOSE
)
/ "||" _
/ "|" _
/ "@" _ CURLY_OPEN boxchars+ CURLY_CLOSE
alignat_spec
= CURLY_OPEN num:([0-9]+ { return $this->text(); }) _ CURLY_CLOSE
{ return TexArray::newCurly(new Literal($num)); }
opt_pos
= "[" _ [tcb] _ "]" _
/ "" /* empty */
/////////////////////////////////////////////////////////////
// MHCHEM grammar rules
//----------------------------------------------------------
chem_lit
= CURLY_OPEN e:chem_sentence CURLY_CLOSE { return $e->setCurly(); }
chem_sentence =
_ p:chem_phrase " " s:chem_sentence { return new TexArray($p,new TexArray(new Literal(" "),$s)); } /
_ p:chem_phrase _ { return new TexArray($p,new TexArray()); }
chem_phrase =
m:"(^)" { return new Literal($m); } /
m:chem_word n:CHEM_SINGLE_MACRO { return new ChemWord($m, new Literal($n)); }/
m:chem_word { return $m; } /
m:CHEM_SINGLE_MACRO { return new Literal($m); } /
m:"^" { return new Literal($m); }
chem_word =
m:chem_char n:chem_word_nt { return new ChemWord($m, $n); } /
m:CHEM_SINGLE_MACRO n:chem_char_nl o:chem_word_nt { return new ChemWord(new ChemWord(new Literal($m), $n), $o); }
chem_word_nt = m:chem_word { return $m; } /
"" { return new Literal(""); }
chem_char =
m:chem_char_nl { return $m;} /
c:CHEM_LETTER { return new Literal($c); }
chem_char_nl =
m:chem_script { return $m;} /
CURLY_OPEN c:chem_text CURLY_CLOSE { return TexArray::newCurly($c); } /
BEGIN_MATH c:expr END_MATH { return new Dollar($c); }/
name:CHEM_BONDI l:chem_bond { return new Fun1($name, $l); } /
m:chem_macro { return $m; } /
c:CHEM_NONLETTER { return new Literal($c); }
chem_bond
= CURLY_OPEN e:CHEM_BOND_TYPE CURLY_CLOSE { return TexArray::newCurly(new Literal($e)); }
chem_script =
a:CHEM_SUPERSUB b:CHEM_SCRIPT_FOLLOW { return new ChemWord(new Literal($a), new Literal($b)); } /
a:CHEM_SUPERSUB b:chem_lit { return new ChemWord(new Literal($a), $b); } /
a:CHEM_SUPERSUB BEGIN_MATH b:expr END_MATH { return new ChemWord(new Literal($a), new Dollar($b)); }
// TODO \color is a not documented feature of mhchem for MathJax, at the moment named colors are accepted
chem_macro =
name:CHEM_MACRO_2PU l1:chem_lit "_" l2:chem_lit { return new ChemFun2u($name, $l1, $l2); }/ //return new Fun1nb($name, $l);
name:CHEM_MACRO_2PC l1:CHEM_COLOR l2:chem_lit { return new Fun2($name, $l1, $l2); } /
name:CHEM_MACRO_2P l1:chem_lit l2:chem_lit { return new Fun2($name, $l1, $l2); } /
name:CHEM_MACRO_1P l:chem_lit { return new Fun1($name, $l); }
chem_text = cs:boxchars+ { return new Literal(join('',$cs)); }
CHEM_COLOR = "{" _ name:alpha+ _ "}" _ { return new Literal(join('',$name)); }
/////////////////////////////////////////////////////////////
// LEXER
//----------------------------------------------------------
//space = [ \t\n\r]
alpha = [a-zA-Z]
literal_id = [a-zA-Z]
literal_mn = [0-9]
literal_uf_lt = [,:;?!\']
delimiter_uf_lt = [().]
literal_uf_op = [-+*=]
delimiter_uf_op = [\/|]
boxchars // match only valid UTF-16 sequences
= [-0-9a-zA-Z+*,=():\/;?.!'` \[\]\[\u0080-\ud7ff\]\[\ue000-\uffff\]]
BOX
= b:generic_func &{ return $this->tu->box_functions($b); } _ "{" cs:boxchars+ "}" _
{ return new Box($b, join('', $cs)); }
LITERAL
= c:( literal_id / literal_mn / literal_uf_lt / "-" / literal_uf_op ) _
{ return $c; }
/ f:generic_func &{ return $this->tu->nullary_macro($f); } _ // from Texutil.find(...)
{ return $f . " "; }
/ f:generic_func &{ return $this->options['usemathrm'] && $this->tu->nullary_macro_in_mbox($f); } _ // from Texutil.find(...)
{ return "\\mathrm {" . $f . "} "; }
/ mathrm:generic_func &{ return $this->options['usemathrm'] && $mathrm === "\\mathrm"; } _
"{" f:generic_func &{ return $this->options['usemathrm'] && $this->tu->nullary_macro_in_mbox($f); } _ "}" _
/* make sure we can parse what we emit */
{ return $this->options['usemathrm'] ? "\\mathrm {" . $f . "} " : false;}
/ f:generic_func &{ return $this->tu->nullary_macro_in_mbox($f); } _ // from Texutil.find(...)
{ return "\\mbox{" . $f . "} "; }
/ mbox:generic_func &{ return $mbox === "\\mbox"; } _
"{" f:generic_func &{ return $this->tu->nullary_macro_in_mbox($f); } _ "}" _
/* make sure we can parse what we emit */
{ return "\\mbox{" . $f . "} "; }
/ f:(COLOR / DEFINECOLOR)
{ return $f; }
/ "\\" c:[, ;!_#%$&] _
{ return "\\" . $c; }
/ c:[><~] _
{ return $c; }
/ c:[%$] _
{ if($this->options['oldtexvc']) {
return "\\" . $c; /* escape dangerous chars */
} else {
throw new SyntaxError("Deprecation: % and $ need to be escaped.", [], $this->text(), $this->offset(),
$this->line(), $this->column());
}}
DELIMITER
= c:( delimiter_uf_lt / delimiter_uf_op / "[" ) _
{ return $c; }
/ "\\" c:[{}|] _
{ return "\\" . $c; }
/ f:generic_func &{ return $this->tu->other_delimiters1($f); } _ // from Texutil.find()
{ return $f . " "; }
/ f:generic_func &{ return $this->tu->other_delimiters2($f); } _ // from Texutil.find()
{
$parser = new Parser();
$p = $parser->parse($this->tu->other_delimiters2($f), $this->options);
# assert.ok(p instanceof TexArray && p.length === 1);
assert($p instanceof TexArray && count($p->getArgs()) === 1);
# assert.ok(p.first() instanceof Literal);
assert($p->first() instanceof Literal);
return $p->first()->getArg();
}
FUN_AR1nb
= f:generic_func &{ return $this->tu->fun_ar1nb($f); } _ { return $f; }
FUN_AR1opt
= f:generic_func &{ return $this->tu->fun_ar1opt($f); } _ "[" _ { return $f; }
NEXT_CELL
= "&" _
LATEX_LENGTH
= s:LATEX_SIGN? n:LATEX_NUMBER u:LATEX_UNIT { return new LengthSpec($s, $n, $u); }
LATEX_SIGN
= [+-]
LATEX_NUMBER
= literal_mn+ "."? literal_mn*
/ "." literal_mn+
// from http://latexref.xyz/Units-of-length.html
LATEX_UNIT
= "pt"
/ "pc"
/ "in"
/ "bp"
/ "cm"
/ "mm"
/ "dd"
/ "cc"
/ "sp"
/ "em"
/ "ex"
/ "mu"
/ "nd"
/ "nc"
NEXT_ROW
= ("\\\\" s:("[" l:LATEX_LENGTH "]" { return $l; })? _ {return $s; })
BEGIN
= "\\begin" _
END
= "\\end" _
BEGIN_MATRIX
= BEGIN "{matrix}" _
END_MATRIX
= END "{matrix}" _
BEGIN_PMATRIX
= BEGIN "{pmatrix}" _
END_PMATRIX
= END "{pmatrix}" _
BEGIN_BMATRIX
= BEGIN "{bmatrix}" _
END_BMATRIX
= END "{bmatrix}" _
BEGIN_BBMATRIX
= BEGIN "{Bmatrix}" _
END_BBMATRIX
= END "{Bmatrix}" _
BEGIN_VMATRIX
= BEGIN "{vmatrix}" _
END_VMATRIX
= END "{vmatrix}" _
BEGIN_VVMATRIX
= BEGIN "{Vmatrix}" _
END_VVMATRIX
= END "{Vmatrix}" _
BEGIN_ARRAY
= BEGIN "{array}" _
END_ARRAY
= END "{array}" _
BEGIN_ALIGN
= BEGIN "{align}" _
END_ALIGN
= END "{align}" _
BEGIN_ALIGNED
= BEGIN "{aligned}" _
END_ALIGNED
= END "{aligned}" _
BEGIN_ALIGNAT
= BEGIN "{alignat}" _
END_ALIGNAT
= END "{alignat}" _
BEGIN_ALIGNEDAT
= BEGIN "{alignedat}" _
END_ALIGNEDAT
= END "{alignedat}" _
BEGIN_SMALLMATRIX
= BEGIN "{smallmatrix}" _
END_SMALLMATRIX
= END "{smallmatrix}" _
BEGIN_CASES
= BEGIN "{cases}" _
END_CASES
= END "{cases}" _
SQ_CLOSE
= "]" _
CURLY_OPEN
= "{" _
CURLY_CLOSE
= "}" _
SUP
= "^" _
SUB
= "_" _
// This is from Texutil.find in texvc
generic_func
= "\\" alpha+ { return $this->text(); }
BIG
= f:generic_func &{ return $this->tu->big_literals($f); } _
{ return $f; }
FUN_AR1
= f:generic_func &{ return $this->tu->fun_ar1($f); } _
{ return $f; }
/ f:generic_func &{ return $this->options['oldmhchem'] && $this->tu->fun_mhchem($f);} _
{ return $f; }
/ f:generic_func &{ return $this->tu->other_fun_ar1($f); } _
{ if ($this->options['oldtexvc']) {
return $this->tu->other_fun_ar1($f);
} else {
throw new SyntaxError("Deprecation: \\Bbb and \\bold are not allowed in math mode.", [],
$this->text(), $this->offset(), $this->line(),$this->column());
}
}
FUN_MHCHEM
= f:generic_func &{ return $this->tu->fun_mhchem($f); } _
{ return $f; }
FUN_AR2
= f:generic_func &{ return $this->tu->fun_ar2($f); } _
{ return $f; }
FUN_AR4_MHCHEM_TEXIFIED
= f:generic_func &{ return $this->tu->fun_ar4($f) && $this->tu->mhchemtexified_required($f); } _
{ return $f; }
FUN_INFIX
= f:generic_func &{ return $this->tu->fun_infix($f); } _
{ return $f; }
DECLh
= f:generic_func &{ return $this->tu->declh_function($f); } _
{ return new Declh($f, new TexArray()); }
FUN_AR2nb
= f:generic_func &{ return $this->tu->fun_ar2nb($f); } _
{ return $f; }
LEFTI
= f:generic_func &{ return $this->tu->left_function($f); } _
RIGHTI
= f:generic_func &{ return $this->tu->right_function($f); } _
HLINE
= f:generic_func &{ return $this->tu->hline_function($f); } _
{ return $f; }
COLOR
= f:generic_func &{ return $this->tu->color_function($f); } _ cs:COLOR_SPEC
{ return $f . " " . $cs; }
DEFINECOLOR
= f:generic_func &{ return $this->tu->definecolor_function($f); } _
"{" _ name:alpha+ _ "}" _ "{" _
a:( "named"i _ "}" _ cs:COLOR_SPEC_NAMED { return "{named}" . $cs; }
/ "gray"i _ "}" _ cs:COLOR_SPEC_GRAY { return "{gray}" . $cs; }
/ "rgb" _ "}" _ cs:COLOR_SPEC_rgb { return "{rgb}" . $cs; }
// Note that we actually convert RGB format to rgb format here.
/ "RGB" _ "}" _ cs:COLOR_SPEC_RGBI { return "{rgb}" . $cs; }
/ "cmyk"i _ "}" _ cs:COLOR_SPEC_CMYK { return "{cmyk}" . $cs; } )
{ return $f . " {" . join('',$name) . "}" . $a; }
COLOR_SPEC
= COLOR_SPEC_NAMED
/ "[" _ "named"i _ "]" _ cs:COLOR_SPEC_NAMED
{ return "[named]" . $cs; }
/ "[" _ "gray"i _ "]" _ cs:COLOR_SPEC_GRAY
{ return "[gray]" . $cs; }
/ "[" _ "rgb" _ "]" _ cs:COLOR_SPEC_rgb
{ return "[rgb]" . $cs; }
/ "[" _ "RGB" _ "]" _ cs:COLOR_SPEC_RGBI
// Note that we actually convert RGB format to rgb format here.
{ return "[rgb]" . $cs; }
/ "[" _ "cmyk"i _ "]" _ cs:COLOR_SPEC_CMYK
{ return "[cmyk]" . $cs; }
COLOR_SPEC_NAMED
= "{" _ name:alpha+ _ "}" _
{ return "{" . join('', $name) . "}"; }
COLOR_SPEC_GRAY
= "{" _ k:CNUM + "}"
{ $s = is_array($k) ? $k[0] : $k;
return "{" . $s . "}";}
COLOR_SPEC_rgb
= "{" _ r:CNUM "," _ g:CNUM "," _ b:CNUM "}" _
{ return "{" . $r . "," . $g . "," . $b . "}"; }
COLOR_SPEC_RGBI
= "{" _ r:CNUM255 "," _ g:CNUM255 "," _ b:CNUM255 "}" _
// Note that we normalize the values to [0,1] here.
{ return "{" . $r . "," . $g . "," . $b . "}"; }
COLOR_SPEC_CMYK
= "{" _ c:CNUM "," _ m:CNUM "," _ y:CNUM "," _ k:CNUM "}" _
{ return "{" . $c . "," . $m . "," . $y . "," . $k . "}"; }
// An integer in [0, 255] => normalize it to [0,1]
CNUM255
= n:$( "0" / ([1-9] ([0-9] [0-9]?)? ) ) &{ return intval($n, 10) <= 255; } _
{ return $n / 255; }
// A floating-point number in [0, 1]
CNUM
= n:$( "0"? "." [0-9]+ ) _
{ return $n; }
/ n:$( [01] "."? ) _
{ return $n; }
// MHCHEM LEXER RULES
CHEM_SINGLE_MACRO
= f:generic_func &{ return $this->tu->mhchem_single_macro($f); } { return $f; }
/ "\\" c:[, ;!_#%$&] { return "\\" . $c; }
CHEM_BONDI = f:generic_func &{ return $this->tu->mhchem_bond($f); } _ { return $f; }
CHEM_MACRO_1P = f:generic_func &{ return $this->tu->mhchem_macro_1p($f); } _ { return $f; }
CHEM_MACRO_2P = f:generic_func &{ return $this->tu->mhchem_macro_2p($f); } _ { return $f; }
CHEM_MACRO_2PU = f:generic_func &{ return $this->tu->mhchem_macro_2pu($f); } _ { return $f; }
CHEM_MACRO_2PC = f:generic_func &{ return $this->tu->mhchem_macro_2pc($f); } _ { return $f; }
CHEM_SCRIPT_FOLLOW = literal_mn / literal_id / [+-.*']
CHEM_SUPERSUB = "_" / "^"
CHEM_BOND_TYPE = "=" / "#" / "~--" / "~-" / "~=" / "~" / "-~-" / "...." / "..." / "<-" / "->" / "-" / "1" / "2" / "3"
// As '$' cannot be used (dangerous char in math mode) to switch from chem mode to math mode
// \begin{math} and \end{math} are introduced to do so
BEGIN_MATH = BEGIN "{math}" _
END_MATH = END "{math}" _
CHEM_LETTER = [a-zA-Z]
CHEM_NONLETTER =
c: "\\{" { return $c; } /
c: "\\}" { return $c; } /
c: "\\\\" { return $c; } /
c:[+-=#().,;/*<>|@&\'\[\]] { return $c; } /
c:literal_mn { return $c; } /
CURLY_OPEN CURLY_CLOSE { return "{}"; }
// Missing lexer tokens!
FUN_INFIXh = impossible
FUN_AR1hl = impossible
FUN_AR1hf = impossible
FUN_AR2h = impossible
impossible = & { return false; }
// End of file
EOF = & { return $this->peg_currPos === $this->input_length; }

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parser.pegjs (20 KB)

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