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Replace the path grammar with that in w3c#335 (comment)
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@fuchsia
fuchsia committed Sep 16, 2017
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168 changes: 68 additions & 100 deletions master/paths.html
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Expand Up @@ -970,106 +970,74 @@ <h3 id="PathDataBNF">The grammar for path data</h3>

<p>SVG path data matches the following EBNF grammar.</p>
<pre class='grammar ready-for-wider-review'>
svg_path::= wsp* moveto? (moveto drawto_command*)?

drawto_command::=
moveto
| closepath
| lineto
| horizontal_lineto
| vertical_lineto
| curveto
| smooth_curveto
| quadratic_bezier_curveto
| smooth_quadratic_bezier_curveto
| elliptical_arc
| bearing

moveto::=
( "M" | "m" ) wsp* coordinate_pair_sequence wsp* closepath?

closepath::=
("Z" | "z")

lineto::=
("L"|"l") wsp* (coordinate_pair_sequence | closepath)

horizontal_lineto::=
("H"|"h") wsp* coordinate_sequence

vertical_lineto::=
("V"|"v") wsp* coordinate_sequence

curveto::=
("C"|"c") wsp* (curveto_coordinate_sequence | (coordinate_pair_sequence? closepath))

curveto_coordinate_sequence::=
coordinate_pair_triplet
| (coordinate_pair_triplet comma_wsp? curveto_coordinate_sequence)

smooth_curveto::=
("S"|"s") wsp* (smooth_curveto_coordinate_sequence
| (coordinate_pair_sequence? closepath))

smooth_curveto_coordinate_sequence::=
coordinate_pair_double
| (coordinate_pair_double comma_wsp? smooth_curveto_coordinate_sequence)

quadratic_bezier_curveto::=
("Q"|"q") wsp*
(quadratic_bezier_curveto_coordinate_sequence | (coordinate_pair_sequence? closepath))

quadratic_bezier_curveto_coordinate_sequence::=
coordinate_pair_double
| (coordinate_pair_double comma_wsp? quadratic_bezier_curveto_coordinate_sequence)

smooth_quadratic_bezier_curveto::=
("T"|"t") wsp* (coordinate_pair_sequence | closepath)

elliptical_arc::=
( "A" | "a" ) wsp*
(elliptical_arc_argument_sequence
| (elliptical_arc_argument_sequence? elliptical_arc_closing_argument))

elliptical_arc_argument_sequence::=
elliptical_arc_argument
| (elliptical_arc_argument comma_wsp? elliptical_arc_argument_sequence)

elliptical_arc_argument::=
number comma_wsp? number comma_wsp? number comma_wsp
flag comma_wsp? flag comma_wsp? coordinate_pair

elliptical_arc_closing_argument::=
number comma_wsp? number comma_wsp? number comma_wsp
flag comma_wsp? flag comma_wsp? closepath

bearing::=
( "B" | "b" ) wsp* bearing_argument_sequence

bearing_argument_sequence::=
number | (number comma_wsp? bearing_argument_sequence)

coordinate_pair_double::=
coordinate_pair comma_wsp? coordinate_pair

coordinate_pair_triplet::=
coordinate_pair comma_wsp? coordinate_pair comma_wsp? coordinate_pair

coordinate_pair_sequence::=
coordinate_pair | (coordinate_pair comma_wsp? coordinate_pair_sequence)

coordinate_sequence::=
coordinate | (coordinate comma_wsp? coordinate_sequence)

coordinate_pair::= coordinate comma_wsp? coordinate

coordinate::= sign? number

sign::= "+"|"-"
number ::= ([0-9])+
flag::=("0"|"1")
comma_wsp::=(wsp+ ","? wsp*) | ("," wsp*)
wsp ::= (#x9 | #x20 | #xA | #xC | #xD)
svg_path ::= wsp* moveto wsp* (command wsp*)*

command ::= closepath
| moveto
| lineto
| horizontal_lineto
| vertical_lineto
| curveto
| smooth_curveto
| quadratic_bezier_curveto
| smooth_quadratic_bezier_curveto
| elliptical_arc
| bearing

closepath ::= [Zz]
moveto ::= [Mm] wsp* moveto_argument (delimiter? lineto_argument)*
lineto ::= [Ll] wsp* coordpair_singlet_sequence
horizontal_lineto ::= [Hh] wsp* number_sequence
vertical_lineto ::= [Vv] wsp* number_sequence
curveto ::= [Cc] wsp* coordpair_triplet_sequence
smooth_curveto ::= [Ss] wsp* coordpair_doublet_sequence
quadratic_bezier_curveto ::= [Qq] wsp* coordpair_doublet_sequence
smooth_quadratic_bezier_curveto ::= [Tt] wsp* coordpair_singlet_sequence
elliptical_arc ::= [Aa] wsp* arc_argument_sequence
bearing ::= [Bb] wsp* number_sequence


number_sequence ::= number (delimiter? number)*
coordpair_singlet_sequence ::= coordpair (delimiter? coordpair)*
| closepath
coordpair_doublet_sequence ::= coordpair_doublet (delimiter? coordpair_doublet)*
(delimiter? incomplete_coordpair_doublet)?
| incomplete_coordpair_doublet
| closepath
coordpair_triplet_sequence ::= coordpair_triplet (delimiter? coordpair_triplet)*
(delimiter? incomplete_coordpair_triplet)?
| incomplete_coordpair_triplet
| closepath
arc_argument_sequence ::= arc_argument (delimiter? arc_argument)*
(delimiter? incomplete_arc_argument)?
| incomplete_arc_argument


moveto_argument ::= coordpair
lineto_argument ::= coordpair
coordpair ::= number delimiter? number

coordpair_doublet ::= coordpair delimiter? coordpair
incomplete_coordpair_doublet ::= coordpair wsp* closepath

coordpair_triplet ::= coordpair delimiter? coordpair delimiter? coordpair
incomplete_coordpair_triplet ::= ( coordpair_doublet | coordpair ) wsp* closepath

arc_argument ::= number delimiter? number delimiter? number delimiter
flag delimiter? flag delimiter? coordpair
incomplete_arc_argument ::= number delimiter? number delimiter? number delimiter
flag delimiter? flag wsp* closepath

delimiter ::= wsp+ comma_wsp? | comma_wsp
comma_wsp ::= "," wsp*
flag ::= [01]
number ::= sign? fraction exponent?
fraction ::= digits ( dot digits? )? | dot digits
exponent ::= [Ee] sign? digits
sign ::= "+" | "-"
digits ::= [0-9]+
dot ::= "."
wsp ::= [#x9#xA#xD#x20]
</pre>

<p>The processing of the EBNF must consume as much of a given
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