/usr/share/gtksourceview-3.0/language-specs/groovy.lang is in libgtksourceview-3.0-common 3.24.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
This file is part of GtkSourceView
Copyright (C) 2003 Gustavo Giráldez <gustavo.giraldez@gmx.net>
Copyright (C) 2006 Jeff Walden <jwalden@mit.edu>
Copyright (C) 2017 Roman Donchenko
GtkSourceView is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
GtkSourceView 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, see <http://www.gnu.org/licenses/>.
-->
<language id="groovy" name="Groovy" version="2.0" _section="Source">
<metadata>
<property name="globs">*.groovy</property>
<property name="line-comment-start">//</property>
<property name="block-comment-start">/*</property>
<property name="block-comment-end">*/</property>
</metadata>
<styles>
<style id="comment" name="Comment" map-to="def:comment"/>
<style id="escaped-character" name="Escaped Character" map-to="def:special-char"/>
<style id="interpolation" name="Interpolation Syntax" map-to="def:special-char"/>
<style id="interpolated" name="Interpolated Expression" map-to="def:identifier"/>
<style id="string" name="String" map-to="def:string"/>
<style id="external" name="External" map-to="def:preprocessor"/>
<style id="declaration" name="Declaration" map-to="def:type"/>
<style id="storage-class" name="Storage Class" map-to="def:type"/>
<style id="scope-declaration" name="Scope Declaration" map-to="def:type"/>
<style id="operator" name="Operator" map-to="def:operator"/>
<style id="keyword" name="Keyword" map-to="def:keyword"/>
<style id="null-value" name="Null Value" map-to="def:special-constant"/>
<style id="boolean" name="Boolean value" map-to="def:boolean"/>
<style id="number" name="Number" map-to="def:number"/>
<style id="type" name="Data Type" map-to="def:type"/>
</styles>
<definitions>
<define-regex id="escaped-character" extended="true">
\\(
# character escape
[nrtbf"'\\$] |
# unicode escape
u[0-9A-Fa-f]{4} |
# octal escape
[0-3] ([0-7] [0-7]?)? | [4-7] [0-7]?
)
</define-regex>
<define-regex id="letter" extended="true">
[a-zA-Z\x{c0}-\x{d6}\x{d8}-\x{f6}\x{f8}-\x{ff}\x{100}-\x{fffe}_]
</define-regex>
<context id="escaped-character">
<include>
<context style-ref="escaped-character">
<match>\%{escaped-character}</match>
</context>
<context ref="def:line-continue"/>
<context style-ref="def:error">
<!-- backslashes not part of a valid escape sequence are erroneous -->
<match>\\</match>
</context>
</include>
</context>
<context id="placeholder">
<include>
<context style-ref="interpolated">
<match extended="true">
(\$)
# one or more dollarless identifiers separated by dots
\%{letter} (\%{letter} | \d)*
(\. \%{letter} (\%{letter} | \d)*)*
</match>
<include>
<context sub-pattern="1" style-ref="interpolation"/>
</include>
</context>
<context style-ref="interpolated">
<start>\$\{</start>
<end>\}</end>
<include>
<context sub-pattern="0" where="start" style-ref="interpolation"/>
<context sub-pattern="0" where="end" style-ref="interpolation"/>
<context ref="groovy"/>
</include>
</context>
</include>
</context>
<!-- a dollar that isn't part of a placeholder is erroneous in some instances -->
<context id="bad-placeholder" style-ref="def:error">
<match>\$</match>
</context>
<context id="triple-single-quoted-string" style-ref="string" class="string" class-disabled="no-spell-check">
<start>'''</start>
<end>'''</end>
<include>
<context ref="escaped-character"/>
</include>
</context>
<context id="single-quoted-string" end-at-line-end="true" style-ref="string" class="string" class-disabled="no-spell-check">
<start>'</start>
<end>'</end>
<include>
<context ref="escaped-character"/>
</include>
</context>
<context id="triple-double-quoted-string" style-ref="string" class="string" class-disabled="no-spell-check">
<start>"""</start>
<end>"""</end>
<include>
<context ref="escaped-character"/>
<context ref="placeholder"/>
<context ref="bad-placeholder"/>
</include>
</context>
<context id="double-quoted-string" end-at-line-end="true" style-ref="string" class="string" class-disabled="no-spell-check">
<start>"</start>
<end>"</end>
<include>
<context ref="escaped-character"/>
<context ref="placeholder"/>
<context ref="bad-placeholder"/>
</include>
</context>
<context id="slashy-string" style-ref="string" class="string">
<start extended="true">
# The initial slash must not be preceded by a token that can end an expression.
# Otherwise, it's interpreted as a division operator, not the start of a slashy string.
# It'd be complicated to verify whole tokens with a regex, but the last non-space
# character is a good indicator by itself. We can use a negative lookbehind assertion
# to verify that it's not a character that an expression-ending token can end with.
# Trouble is, a lookbehind assertion has to consist of fixed-length alternatives, so
# we can't have it match an arbitrary amount of whitespace. Thus, we do an approximate
# check, only trying zero and one spaces.
(?<! \+\+ | -- | [])}"\d] | \%{letter} |
\+\+\s | --\s | [])}"\d]\s | \%{letter}\s )
/
</start>
<end>/</end>
<include>
<context style-ref="escaped-character">
<match>\\/</match>
</context>
<context ref="def:line-continue"/>
<context ref="placeholder"/>
<!-- standalone dollars and backslashes are interpreted literally -->
</include>
</context>
<context id="dollar-slashy-string" style-ref="string" class="string">
<start extended="true">
\$/
# Dollar slashy strings can't be empty (a would-be empty one is parsed
# as a dollar followed by a single-line comment instead).
(?! /\$)
</start>
<end>/\$</end>
<include>
<context style-ref="escaped-character">
<match>\$[$/]</match>
</context>
<context ref="def:line-continue"/>
<context ref="placeholder"/>
</include>
</context>
<context id="numeric" style-ref="number">
<match extended="true">
\b (
# floating-point
\d ([\d_]* \d)? (
\. \d ([\d_]* \d)? ([eE] [+-]? [\d_]* \d)? [dDfFgG]? |
[eE] [+-]? [\d_]* \d [dDfFgG]? |
[dDfF]
) |
# integer
(
0 | # decimal zero
0[bB] [01] ([01_]* [01])? | # binary
0 [0-7] ([0-7_]* [0-7])? | # octal
[1-9] ([\d_]* \d)? | # decimal
0[xX] [\da-fA-F] ([\da-fA-F_]* [\da-fA-F])? # hexadecimal
) [iIlLgG]?
) \b
</match>
</context>
<!--
Some of the Java keywords are reserved in Groovy. We don't mark them
with a special style, though, because in some instances keywords can
be used as identifiers (e.g. when used as a member name), and even
reserved keywords are valid when used like that.
-->
<context id="externals" style-ref="external">
<keyword>import</keyword>
<keyword>package</keyword>
</context>
<context id="declarations" style-ref="declaration">
<keyword>class</keyword>
<keyword>enum</keyword>
<keyword>extends</keyword>
<keyword>implements</keyword>
<keyword>interface</keyword>
<keyword>native</keyword>
<keyword>throws</keyword>
<keyword>trait</keyword>
</context>
<context id="primitive-types" style-ref="type">
<keyword>boolean</keyword>
<keyword>byte</keyword>
<keyword>char</keyword>
<keyword>def</keyword>
<keyword>double</keyword>
<keyword>float</keyword>
<keyword>int</keyword>
<keyword>long</keyword>
<keyword>short</keyword>
<keyword>void</keyword>
</context>
<context id="storage-class" style-ref="storage-class">
<keyword>abstract</keyword>
<keyword>const</keyword>
<keyword>final</keyword>
<keyword>static</keyword>
<keyword>strictfp</keyword>
<keyword>synchronized</keyword>
<keyword>transient</keyword>
<keyword>volatile</keyword>
</context>
<context id="scope-declarations" style-ref="scope-declaration">
<keyword>private</keyword>
<keyword>protected</keyword>
<keyword>public</keyword>
</context>
<context id="flow" style-ref="keyword">
<keyword>assert</keyword>
<keyword>break</keyword>
<keyword>case</keyword>
<keyword>catch</keyword>
<keyword>continue</keyword>
<keyword>default</keyword>
<keyword>do</keyword>
<keyword>else</keyword>
<keyword>finally</keyword>
<keyword>for</keyword>
<keyword>goto</keyword>
<keyword>if</keyword>
<keyword>return</keyword>
<keyword>throw</keyword>
<keyword>switch</keyword>
<keyword>try</keyword>
<keyword>while</keyword>
</context>
<context id="operator" style-ref="operator">
<keyword>as</keyword>
<keyword>in</keyword>
<keyword>instanceof</keyword>
<keyword>new</keyword>
<keyword>super</keyword>
<keyword>this</keyword>
</context>
<context id="null-value" style-ref="null-value">
<keyword>null</keyword>
</context>
<context id="boolean" style-ref="boolean">
<keyword>false</keyword>
<keyword>true</keyword>
</context>
<context id="groovy" class="no-spell-check">
<include>
<context ref="def:shebang" style-ref="comment"/>
<context ref="def:c-like-comment" style-ref="comment"/>
<context ref="def:c-like-comment-multiline" style-ref="comment"/>
<context ref="def:line-continue"/>
<context ref="triple-single-quoted-string"/>
<context ref="single-quoted-string"/>
<context ref="triple-double-quoted-string"/>
<context ref="double-quoted-string"/>
<context ref="slashy-string"/>
<context ref="dollar-slashy-string"/>
<context ref="numeric"/>
<context ref="externals"/>
<context ref="declarations"/>
<context ref="primitive-types"/>
<context ref="storage-class"/>
<context ref="scope-declarations"/>
<context ref="flow"/>
<context ref="operator"/>
<context ref="null-value"/>
<context ref="boolean"/>
</include>
</context>
</definitions>
</language>
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