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<?xml version="1.0" encoding="UTF-8"?>
<!--
This file is part of Inkscape.
Authors:
Rafael Siejakowski <rs@rs-math.net>
Copyright (C) 2022 the Authors.
Released under GNU GPL v2+, read the file 'COPYING' for more information.
-->
<language id="svgd" _name="SVG path attribute 'd'" version="2.0" _section="Markup">
<styles>
<style id="command" _name="Path command" map-to="def:keyword"/>
<style id="error" _name="Error" map-to="def:error"/>
<style id="numeric" _name="Path node coordinate" map-to="def:number"/>
<style id="alternate-numeric" _name="Control point coordinate" map-to="def:special-constant"/>
<style id="angle" _name="Ellipse rotation angle" map-to="def:type"/>
<style id="flags" _name="Boolean flags" map-to="def:preprocessor"/>
</styles>
<default-regex-options case-sensitive="false"/>
<definitions>
<!-- Based on SVG2 specification, § 9.3.9. The grammar for path data. -->
<define-regex id="maybecwsp">(?m)[\s,\r\n]*</define-regex>
<define-regex id="exponent">e[+\-]?\d+</define-regex>
<define-regex id="fractional-constant">\d*\.\d+|\d+</define-regex>
<define-regex id="number">\%{fractional-constant}(\%{exponent})?</define-regex>
<define-regex id="coordinate">[+\-]?\%{number}</define-regex>
<define-regex id="positive-coordinate">\+?\%{number}</define-regex>
<define-regex id="command-letter">[MLHVCSQTAZ]</define-regex>
<define-regex id="invalid">[^\-+\s\r\n,\.MLHVCSQTAZmlhvcsqtaz0-9Ee]</define-regex>
<define-regex id="command-end">(?m)(?=\%{command-letter}|\%{invalid})</define-regex>
<!-- Define error contexts -->
<context id="command-not-allowed" style-ref="error" extend-parent="false" end-parent="true">
<match>(\%{command-letter}|e)</match>
</context>
<context id="invalid-char" style-ref="error" extend-parent="false" end-parent="true">
<match>\%{invalid}</match>
</context>
<!-- Coordinate pair is defined as a region (allows for two numbers on separate lines). -->
<context id="point">
<start>\%{coordinate}</start>
<end>\%{coordinate}</end>
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="numeric"/>
<context sub-pattern="0" where="end" style-ref="numeric"/>
</include>
</context>
<!-- PRIVATE: A pair of numbers with different highlighting. -->
<context id="PRIVATE-heterochromic4-inner2" extend-parent="true" once-only="true">
<start>\%{coordinate}</start>
<end>\%{coordinate}</end>
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="alternate-numeric"/>
<context sub-pattern="0" where="end" style-ref="numeric"/>
</include>
</context>
<!-- A 4-tuple of numbers with different highlighting for the first two than for the last two. -->
<context id="heterochromic4" extend-parent="false">
<start>\%{coordinate}</start>
<end>\%{coordinate}</end>
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context id="heterochromic4-first" sub-pattern="0" where="start" style-ref="alternate-numeric"/>
<context id="heterochromic4-last" sub-pattern="0" where="end" style-ref="numeric"/>
<context ref="PRIVATE-heterochromic4-inner2"/>
</include>
</context>
<!-- PRIVATE: A pair of numbers with alternate highlighting. -->
<context id="PRIVATE-heterochromic6-inner4-inner2" extend-parent="true" once-only="true">
<start>\%{coordinate}</start>
<end>\%{coordinate}</end>
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="alternate-numeric"/>
<context sub-pattern="0" where="end" style-ref="alternate-numeric"/>
</include>
</context>
<!-- PRIVATE: A 4-tuple of numbers with different highlighting for the first three than for the last one. -->
<context id="PRIVATE-heterochromic6-inner4" extend-parent="true" once-only="true">
<start>\%{coordinate}</start>
<end>\%{coordinate}</end>
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="alternate-numeric"/>
<context sub-pattern="0" where="end" style-ref="numeric"/>
<context ref="PRIVATE-heterochromic6-inner4-inner2"/>
</include>
</context>
<!-- A 6-tuple of numbers with different highlighting for the first four than for the last two. -->
<context id="heterochromic6" extend-parent="false">
<start>\%{coordinate}</start>
<end>\%{coordinate}</end>
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="alternate-numeric"/>
<context sub-pattern="0" where="end" style-ref="numeric"/>
<context ref="PRIVATE-heterochromic6-inner4"/>
</include>
</context>
<!-- PRIVATE: The third shell of arcto arguments. -->
<context id="PRIVATE-arcto-shell3" extend-parent="true" once-only="true">
<start>\%{coordinate}</start><!-- rotation angle -->
<end>(0|1)\%{maybecwsp}(0|1)</end><!-- flags -->
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="angle"/>
<context sub-pattern="0" where="end" style-ref="flags"/>
</include>
</context>
<!-- PRIVATE: The second shell of arcto arguments. -->
<context id="PRIVATE-arcto-shell2" extend-parent="true" once-only="true">
<start>\%{positive-coordinate}</start><!-- ray y -->
<end>\%{coordinate}</end><!-- endpoint x -->
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="alternate-numeric"/>
<context sub-pattern="0" where="end" style-ref="numeric"/>
<context ref="PRIVATE-arcto-shell3"/>
</include>
</context>
<!-- The arguments of an arcto command. -->
<context id="arcto-args" extend-parent="false">
<start>\%{positive-coordinate}</start><!-- ray x -->
<end>\%{coordinate}</end><!-- endpoint y -->
<include>
<context ref="command-not-allowed"/>
<context ref="invalid-char"/>
<context sub-pattern="0" where="start" style-ref="alternate-numeric"/>
<context sub-pattern="0" where="end" style-ref="numeric"/>
<context ref="PRIVATE-arcto-shell2"/>
</include>
</context>
<!-- A valid SVG coordinate. -->
<context id="coord" style-ref="numeric">
<match>\%{coordinate}</match>
</context>
<!-- Start the SVG path `d` definition. -->
<context id="svgd">
<include>
<!-- An M, L or T command (expecting a sequence of points). -->
<context id="moveto">
<start>M|L|T</start>
<end>\%{command-end}</end>
<include>
<context sub-pattern="0" where="start" style-ref="command"/>
<context ref="point"/>
</include>
</context>
<!-- An H or V command (expecting a sequence of coordinates). -->
<context id="paraxial">
<start>H|V</start>
<end>\%{command-end}</end>
<include>
<context sub-pattern="0" where="start" style-ref="command"/>
<context ref="coord"/>
</include>
</context>
<!-- S and Q commands: expecting a sequence of **pairs** of points. -->
<context id="smooth-cubic-or-quadratic">
<start>S|Q</start>
<end>\%{command-end}</end>
<include>
<context sub-pattern="0" where="start" style-ref="command"/>
<!-- The argument of the S/Q command is 4*n numbers; in each 4-tuple we
highlight the first two coords differently than the last two. -->
<context ref="heterochromic4"/>
</include>
</context>
<!-- C command: expecting a sequence of **triples** of points. -->
<context id="cubic-bezier">
<start>C</start>
<end>\%{command-end}</end>
<include>
<context sub-pattern="0" where="start" style-ref="command"/>
<!-- In each 6-tuple we highlight the first four numbers differently than the last two. -->
<context ref="heterochromic6"/>
</include>
</context>
<!-- A command: elliptical arc. -->
<context id="elliptical-arc">
<start>A</start>
<end>\%{command-end}</end>
<include>
<context sub-pattern="0" where="start" style-ref="command"/>
<context ref="arcto-args"/>
</include>
</context>
<context id="z-command" style-ref="command">
<keyword>Z</keyword>
</context>
<context ref="invalid-char"/>
</include>
</context>
</definitions>
</language>
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