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Scarlet

drawing

Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader. It is designed to allow quick prototyping for server scripting & content creation.

What is Scarlet used for?

Scarlet makes it easy to add new scripted content to the game without prior Java experience. My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).

Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production, I would recommend KubeJS instead.

Give me an example!

Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension. Reload all Scarlet code by pressing the 'R' key. How about we print a simple greeting when a player joins the server?

join_script_example.png

Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it. Scarlet has a nice error logging system which will show you exactly where offending code lies:

scarlet_error.png

Give me more examples!

You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository. Here are a few of our favorites:

API for you!

Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone. This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom expression for killing entities:

publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());

ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).

A Note on Stability

Scarlet is, first and foremost, a fun educational exercise for me in the art of language design. I make no promises about the stability of your scripts or API interactions at the current stage of the project, because the status of the project is based off my personal quest for enjoyment.

My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying about me breaking every script you have ever written. :)

Licensing

Scarlet started out as an educational project based off Crafting Interpreters and other compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information, but the tl;dr is that you can use the code inside this repository as long as any significant chunks are accompanied by the license file.

About

A fun interpreted programming language built for Minecraft

www.curseforge.com/minecraft/mc-mods/scarlet

Topics

fabriclanguagesminecraft

Resources

Readme
MIT license
Activity

Stars

17 stars

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
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Scarlet
drawing
Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader.
It is designed to allow quick prototyping for server scripting & content creation.
What is Scarlet used for?
Scarlet makes it easy to add new scripted content to the game without prior Java experience.
My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who
need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).
Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production,
I would recommend KubeJS instead.
Give me an example!
Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension.
Reload all Scarlet code by pressing the 'R' key.
How about we print a simple greeting when a player joins the server?
join_script_example.png
Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it.
Scarlet has a nice error logging system which will show you exactly where offending code lies:
scarlet_error.png
Give me more examples!
You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository.
Here are a few of our favorites:
API for you!
Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone.
This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom
expression for killing entities:
publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());
ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).
A Note on Stability
Scarlet is, first and foremost, a fun educational exercise for me in the art of language design.
I make no promises about the stability of your scripts or API interactions at the current stage of the project,
because the status of the project is based off my personal quest for enjoyment.
My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable
and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying
about me breaking every script you have ever written. :)
Licensing
Scarlet started out as an educational project based off Crafting Interpreters and other
compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information,
but the tl;dr is that you can use the code inside this repository as long as any significant chunks
are accompanied by the license file.
About
A fun interpreted programming language built for Minecraft
www.curseforge.com/minecraft/mc-mods/scarlet
Topics
fabriclanguagesminecraft
Resources
Readme
MIT license
Activity
Stars
17 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Scarlet
drawing
Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader.
It is designed to allow quick prototyping for server scripting & content creation.
What is Scarlet used for?
Scarlet makes it easy to add new scripted content to the game without prior Java experience.
My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who
need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).
Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production,
I would recommend KubeJS instead.
Give me an example!
Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension.
Reload all Scarlet code by pressing the 'R' key.
How about we print a simple greeting when a player joins the server?
join_script_example.png
Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it.
Scarlet has a nice error logging system which will show you exactly where offending code lies:
scarlet_error.png
Give me more examples!
You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository.
Here are a few of our favorites:
API for you!
Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone.
This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom
expression for killing entities:
publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());
ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).
A Note on Stability
Scarlet is, first and foremost, a fun educational exercise for me in the art of language design.
I make no promises about the stability of your scripts or API interactions at the current stage of the project,
because the status of the project is based off my personal quest for enjoyment.
My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable
and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying
about me breaking every script you have ever written. :)
Licensing
Scarlet started out as an educational project based off Crafting Interpreters and other
compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information,
but the tl;dr is that you can use the code inside this repository as long as any significant chunks
are accompanied by the license file.
About
A fun interpreted programming language built for Minecraft
www.curseforge.com/minecraft/mc-mods/scarlet
Topics
fabriclanguagesminecraft
Resources
Readme
MIT license
Activity
Stars
17 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Scarlet
drawing
Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader.
It is designed to allow quick prototyping for server scripting & content creation.
What is Scarlet used for?
Scarlet makes it easy to add new scripted content to the game without prior Java experience.
My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who
need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).
Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production,
I would recommend KubeJS instead.
Give me an example!
Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension.
Reload all Scarlet code by pressing the 'R' key.
How about we print a simple greeting when a player joins the server?
join_script_example.png
Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it.
Scarlet has a nice error logging system which will show you exactly where offending code lies:
scarlet_error.png
Give me more examples!
You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository.
Here are a few of our favorites:
API for you!
Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone.
This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom
expression for killing entities:
publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());
ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).
A Note on Stability
Scarlet is, first and foremost, a fun educational exercise for me in the art of language design.
I make no promises about the stability of your scripts or API interactions at the current stage of the project,
because the status of the project is based off my personal quest for enjoyment.
My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable
and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying
about me breaking every script you have ever written. :)
Licensing
Scarlet started out as an educational project based off Crafting Interpreters and other
compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information,
but the tl;dr is that you can use the code inside this repository as long as any significant chunks
are accompanied by the license file.
About
A fun interpreted programming language built for Minecraft
www.curseforge.com/minecraft/mc-mods/scarlet
Topics
fabriclanguagesminecraft
Resources
Readme
MIT license
Activity
Stars
17 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Scarlet
drawing
Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader.
It is designed to allow quick prototyping for server scripting & content creation.
What is Scarlet used for?
Scarlet makes it easy to add new scripted content to the game without prior Java experience.
My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who
need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).
Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production,
I would recommend KubeJS instead.
Give me an example!
Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension.
Reload all Scarlet code by pressing the 'R' key.
How about we print a simple greeting when a player joins the server?
join_script_example.png
Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it.
Scarlet has a nice error logging system which will show you exactly where offending code lies:
scarlet_error.png
Give me more examples!
You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository.
Here are a few of our favorites:
API for you!
Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone.
This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom
expression for killing entities:
publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());
ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).
A Note on Stability
Scarlet is, first and foremost, a fun educational exercise for me in the art of language design.
I make no promises about the stability of your scripts or API interactions at the current stage of the project,
because the status of the project is based off my personal quest for enjoyment.
My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable
and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying
about me breaking every script you have ever written. :)
Licensing
Scarlet started out as an educational project based off Crafting Interpreters and other
compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information,
but the tl;dr is that you can use the code inside this repository as long as any significant chunks
are accompanied by the license file.
About
A fun interpreted programming language built for Minecraft
www.curseforge.com/minecraft/mc-mods/scarlet
Topics
fabriclanguagesminecraft
Resources
Readme
MIT license
Activity
Stars
17 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Scarlet
drawing
Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader.
It is designed to allow quick prototyping for server scripting & content creation.
What is Scarlet used for?
Scarlet makes it easy to add new scripted content to the game without prior Java experience.
My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who
need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).
Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production,
I would recommend KubeJS instead.
Give me an example!
Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension.
Reload all Scarlet code by pressing the 'R' key.
How about we print a simple greeting when a player joins the server?
join_script_example.png
Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it.
Scarlet has a nice error logging system which will show you exactly where offending code lies:
scarlet_error.png
Give me more examples!
You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository.
Here are a few of our favorites:
API for you!
Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone.
This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom
expression for killing entities:
publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());
ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).
A Note on Stability
Scarlet is, first and foremost, a fun educational exercise for me in the art of language design.
I make no promises about the stability of your scripts or API interactions at the current stage of the project,
because the status of the project is based off my personal quest for enjoyment.
My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable
and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying
about me breaking every script you have ever written. :)
Licensing
Scarlet started out as an educational project based off Crafting Interpreters and other
compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information,
but the tl;dr is that you can use the code inside this repository as long as any significant chunks
are accompanied by the license file.
About
A fun interpreted programming language built for Minecraft
www.curseforge.com/minecraft/mc-mods/scarlet
Topics
fabriclanguagesminecraft
Resources
Readme
MIT license
Activity
Stars
17 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Scarlet
drawing
Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader.
It is designed to allow quick prototyping for server scripting & content creation.
What is Scarlet used for?
Scarlet makes it easy to add new scripted content to the game without prior Java experience.
My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who
need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).
Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production,
I would recommend KubeJS instead.
Give me an example!
Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension.
Reload all Scarlet code by pressing the 'R' key.
How about we print a simple greeting when a player joins the server?
join_script_example.png
Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it.
Scarlet has a nice error logging system which will show you exactly where offending code lies:
scarlet_error.png
Give me more examples!
You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository.
Here are a few of our favorites:
API for you!
Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone.
This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom
expression for killing entities:
publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());
ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).
A Note on Stability
Scarlet is, first and foremost, a fun educational exercise for me in the art of language design.
I make no promises about the stability of your scripts or API interactions at the current stage of the project,
because the status of the project is based off my personal quest for enjoyment.
My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable
and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying
about me breaking every script you have ever written. :)
Licensing
Scarlet started out as an educational project based off Crafting Interpreters and other
compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information,
but the tl;dr is that you can use the code inside this repository as long as any significant chunks
are accompanied by the license file.
About
A fun interpreted programming language built for Minecraft
www.curseforge.com/minecraft/mc-mods/scarlet
Topics
fabriclanguagesminecraft
Resources
Readme
MIT license
Activity
Stars
17 stars
Watchers
1 watching
Forks
0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
Scarlet
drawing
Scarlet is an interpreted programming language built for Minecraft on the Fabric Loader.
It is designed to allow quick prototyping for server scripting & content creation.
What is Scarlet used for?
Scarlet makes it easy to add new scripted content to the game without prior Java experience.
My primary target audience is (1) people looking to have fun with friends on private servers, and (2) people who
need a tool for scripting Minecraft video content or minigames (which isn't a strong point of Java).
Scarlet is also a viable option for modpack event scripting, but for anything serious being shipped to production,
I would recommend KubeJS instead.
Give me an example!
Scarlet code goes in your /run/scarlet/ directory with the .scarlet file extension.
Reload all Scarlet code by pressing the 'R' key.
How about we print a simple greeting when a player joins the server?
join_script_example.png
Oops! I made a mistake while typing this out and wrote "on join server" instead, you say, wondering how Scarlet will handle it.
Scarlet has a nice error logging system which will show you exactly where offending code lies:
scarlet_error.png
Give me more examples!
You can find a collection of Scarlet example scripts in the /example_scripts/ directory of this repository.
Here are a few of our favorites:
API for you!
Most of the Minecraft-related language mechanics in Scarlet are powered by an API that is available to everyone.
This system is undocumented for now, but if you are interested in toying around with it, take this example of implementing a custom
expression for killing entities:
publicclassKillExpressionextendsScarletPatternExpression {
privatestaticfinalExpressionFragmentTARGET = ExpressionFragment.of();
privatestaticfinalScarletSyntaxKILL = newScarletSyntax(LiteralFragment.of("kill"), TARGET);
@OverridepublicScarletSyntaxgetPattern() {
returnKILL;
}
@OverridepublicObjectapply(ScarletSyntax.Instancesyntax, ScarletInterpreterinterpreter, BlockStatementblock) {
Expressionexpression = syntax.get(TARGET);
Objectvariable = expression.evaluate(interpreter);
if(variableinstanceofEntityentity) {
entity.kill();
returntrue;
}
returnfalse;
}
}
ScarletLanguage.registerExpression(newKillExpression());
ScarletLanguage.registerEvent(ScarletPatternExpression) is also available for registering event syntax (anything that reads "on this event"...).
A Note on Stability
Scarlet is, first and foremost, a fun educational exercise for me in the art of language design.
I make no promises about the stability of your scripts or API interactions at the current stage of the project,
because the status of the project is based off my personal quest for enjoyment.
My personal gesture regarding stability is that Scarlet will stay in the 0.x.x version scheme while it is unstable
and prone to changes. Once 1.x.x arrives, I will focus on keeping API stable, so you can update without worrying
about me breaking every script you have ever written. :)
Licensing
Scarlet started out as an educational project based off Crafting Interpreters and other
compiler resources, which is why it is licensed as MIT. You can read the LICENSE file for more information,
but the tl;dr is that you can use the code inside this repository as long as any significant chunks
are accompanied by the license file.
About
A fun interpreted programming language built for Minecraft
www.curseforge.com/minecraft/mc-mods/scarlet
Topics
fabriclanguagesminecraft
Resources
Readme
MIT license
Activity
Stars
17 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages