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Skull (#4466)
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‎esolang/pom.xml

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<module>loop</module>
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<module>nanofuck</module>
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<module>sickbay</module>
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<module>skull</module>
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<module>snowball</module>
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<module>wheel</module>
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</modules>

‎esolang/skull/README.md

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# Skull Grammar
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An ANTLR4 grammar for [Skull](https://esolangs.org/wiki/Skull) files.
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‎esolang/skull/desc.xml

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<?xml version="1.0" encoding="UTF-8" ?>
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<desc xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../_scripts/desc.xsd">
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<targets>CSharp;Cpp;Dart;Go;Java;JavaScript;PHP;Python3;TypeScript;Antlr4ng</targets>
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</desc>

‎esolang/skull/examples/example1.txt

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:ASC: // set mode to ASCII (without this code the program would just output every cell as a number)
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{0[+72]} // set cell 0 to the ASCII value 72 (H)
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{1[+101]} // set cell 1 to the ASCII value 101(e)
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{2[+108]} // set cell 2 to the ASCII value 108(l)
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{3[+111]} // set cell 3 to the ASCII value 111(o)
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{4[+32]} // set cell 4 to the ASCII value 32 (space)
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{5[+87]} // set cell 5 to the ASCII value 87 (W)
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{6[+114]} // set cell 6 to the ASCII value 114(r)
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{7[+100]} // set cell 7 to the ASCII value 100(d)
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{8[+33]} // set cell 8 to the ASCII value 33 (!)
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{9[+10]} // set cell 9 to the ASCII value 10 (newline)
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|0| // H
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|1| // e
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|2| // l
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|2| // l
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|3| // o
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|4| //
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|5| // W
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|3| // o
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|6| // r
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|2| // l
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|7| // d
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|8| // !
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|9| // newline

‎esolang/skull/examples/example2.txt

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:NUM: // set mode to NUM
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{0[+4]} // set cell 0 to 4
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{1[+2]} // set cell 1 to 2
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{0{ // while cell 0 is not 0
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{0[-1]} // subtract cell 0 by 1
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{1[+1]} // add 1 to cell 1
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}} // end while
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|1| // print cell 1 (6)

‎esolang/skull/examples/example3.txt

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:NUM: // set mode to NUM
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{0[+7]} // set cell 0 to 7
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{1[+3]} // set cell 1 to 3
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{2[+43]} // set cell 2 to 43
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{3[+61]} // set cell 3 to 61
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|0| // print cell 0
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:ASC:
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|2| // print cell 2 (+)
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:NUM:
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|1| // print cell 1
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{0{ // while cell 0 is not 0
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{0[-1]} // subtract cell 0 by 1
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{1[+1]} // add 1 to cell 1
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}} // end while
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:ASC:
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|3| // print cell 3 (=)
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:NUM:
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|1| // print cell 1 (10)
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‎esolang/skull/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>skull</artifactId>
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<packaging>jar</packaging>
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<name>khubla.com Skull grammar</name>
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<parent>
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<groupId>org.antlr.grammars</groupId>
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<artifactId>esolangparent</artifactId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<build>
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<plugins>
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<plugin>
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<groupId>org.antlr</groupId>
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<artifactId>antlr4-maven-plugin</artifactId>
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<version>${antlr.version}</version>
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<configuration>
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<sourceDirectory>${basedir}</sourceDirectory>
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<includes>
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<include>skull.g4</include>
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</includes>
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<visitor>true</visitor>
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<listener>true</listener>
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</configuration>
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<executions>
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<execution>
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<goals>
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<goal>antlr4</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>com.khubla.antlr</groupId>
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<artifactId>antlr4test-maven-plugin</artifactId>
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<version>${antlr4test-maven-plugin.version}</version>
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<configuration>
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<verbose>false</verbose>
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<showTree>false</showTree>
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<entryPoint>skull</entryPoint>
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<grammarName>skull</grammarName>
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<packageName></packageName>
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<exampleFiles>examples/</exampleFiles>
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</configuration>
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<executions>
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<execution>
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<goals>
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<goal>test</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎esolang/skull/skull.g4

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/*
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BSD License
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Copyright (c) 2025, Tom Everett
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of Tom Everett nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// $antlr-format alignTrailingComments true, columnLimit 150, minEmptyLines 1, maxEmptyLinesToKeep 1, reflowComments false, useTab false
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// $antlr-format allowShortRulesOnASingleLine false, allowShortBlocksOnASingleLine true, alignSemicolons hanging, alignColons hanging
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grammar skull;
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skull
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: command* EOF
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;
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command
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: while
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| endwhile
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| incdec
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| print
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| mode_
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;
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while
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: '{' num '{'
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;
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endwhile
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: '}' '}'
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;
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incdec
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: '{' num '[' num ']' '}'
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;
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print
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: '|' num '|'
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;
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mode_
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: ASC
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| NUM
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;
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ASC
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: ':ASC:'
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;
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NUM
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: ':NUM:'
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;
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num
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: ('-' | '+')? INT
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;
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INT
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: [0-9]+
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;
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WS
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: [ \t\r\n] -> skip
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;
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COMMENT
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: '//' ([ \t]+) ~ [\r\n]* -> skip
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;
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