From 4bb5aef061b07128c8c2185627f5fd66381799e8 Mon Sep 17 00:00:00 2001
From: nikhilkalburgi45 <nikhilkalburgi21@gmail.com>
Date: Wed, 25 Mar 2026 19:47:04 +0530
Subject: [PATCH] Add Gleam language definition

---
 src/components.json                   |  4 +++
 src/languages/gleam.js                | 36 +++++++++++++++++++++++++++
 tests/languages/gleam/attributes.test |  9 +++++++
 tests/languages/gleam/basic.test      | 11 ++++++++
 tests/languages/gleam/numbers.test    | 11 ++++++++
 tests/languages/gleam/operators.test  |  7 ++++++
 tests/languages/gleam/types.test      |  9 +++++++
 7 files changed, 87 insertions(+)
 create mode 100644 src/languages/gleam.js
 create mode 100644 tests/languages/gleam/attributes.test
 create mode 100644 tests/languages/gleam/basic.test
 create mode 100644 tests/languages/gleam/numbers.test
 create mode 100644 tests/languages/gleam/operators.test
 create mode 100644 tests/languages/gleam/types.test

diff --git a/src/components.json b/src/components.json
index 7dfe6d098d..384c590198 100644
--- a/src/components.json
+++ b/src/components.json
@@ -502,6 +502,10 @@
 			"title": "GNU Linker Script",
 			"owner": "RunDevelopment"
 		},
+		"gleam": {
+    		"title": "Gleam",
+		"owner": "nikhilkalburgi45"
+		},
 		"go": {
 			"title": "Go",
 			"owner": "arnehormann"
diff --git a/src/languages/gleam.js b/src/languages/gleam.js
new file mode 100644
index 0000000000..4284573623
--- /dev/null
+++ b/src/languages/gleam.js
@@ -0,0 +1,36 @@
+Prism.languages.gleam = {
+	// doc comments first so /// isn't matched as //
+	'comment': [
+		/\/\/{3,4}.*/,
+		/\/\/.*/
+	],
+
+	'string': {
+		pattern: /"(?:\\.|[^"\\])*"/,
+		greedy: true
+	},
+
+	'attribute': {
+		pattern: /@\w+/,
+		alias: 'annotation'
+	},
+
+	'keyword': /\b(?:as|assert|case|const|echo|else|fn|if|import|let|opaque|panic|pub|todo|type|use)\b/,
+
+	'boolean': /\b(?:True|False)\b/,
+
+	// keep before class-name so builtins are highlighted correctly
+	'builtin': /\b(?:Int|Float|String|Bool|List|Result|Option|Nil)\b/,
+
+	// heuristic: matches types and constructors (no AST available)
+	'class-name': /\b[A-Z]\w*\b/,
+
+	'number': /\b(?:0b[01][01_]*|0o[0-7][0-7_]*|0x[\da-fA-F][\da-fA-F_]*|\d[\d_]*(?:\.[\d_]+)?(?:[eE][+-]?\d[\d_]*)?)\b/,
+
+	// best-effort: identifier followed by (
+	'function': /\b[a-z_]\w*(?=\s*\()/,
+
+	'operator': /\|>|<>|->|<-|\.\.|\+\.|-\.|\*\.|\/\.|==|!=|<=|>=|&&|\|\||[+\-*\/%<>=!]/,
+
+	'punctuation': /[{}[\](),.:;#]/
+};
\ No newline at end of file
diff --git a/tests/languages/gleam/attributes.test b/tests/languages/gleam/attributes.test
new file mode 100644
index 0000000000..dbacc44462
--- /dev/null
+++ b/tests/languages/gleam/attributes.test
@@ -0,0 +1,9 @@
+======
+Attributes
+======
+@external(erlang, "calendar", "local_time")
+pub fn now() { Nil }
+======
+<span class="token attribute">@external</span><span class="token punctuation">(</span>erlang<span class="token punctuation">,</span> <span class="token string">"calendar"</span><span class="token punctuation">,</span> <span class="token string">"local_time"</span><span class="token punctuation">)</span>
+<span class="token keyword">pub</span> <span class="token keyword">fn</span> <span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token builtin">Nil</span> <span class="token punctuation">}</span>
+======
\ No newline at end of file
diff --git a/tests/languages/gleam/basic.test b/tests/languages/gleam/basic.test
new file mode 100644
index 0000000000..59cdb023be
--- /dev/null
+++ b/tests/languages/gleam/basic.test
@@ -0,0 +1,11 @@
+======
+Basic function
+======
+pub fn main() {
+  echo "hello"
+}
+======
+<span class="token keyword">pub</span> <span class="token keyword">fn</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
+  <span class="token keyword">echo</span> <span class="token string">"hello"</span>
+<span class="token punctuation">}</span>
+======
\ No newline at end of file
diff --git a/tests/languages/gleam/numbers.test b/tests/languages/gleam/numbers.test
new file mode 100644
index 0000000000..57c0f1e21f
--- /dev/null
+++ b/tests/languages/gleam/numbers.test
@@ -0,0 +1,11 @@
+======
+Numbers
+======
+let x = 42
+let y = 3.14
+let z = 0xFF
+======
+<span class="token keyword">let</span> x <span class="token operator">=</span> <span class="token number">42</span>
+<span class="token keyword">let</span> y <span class="token operator">=</span> <span class="token number">3.14</span>
+<span class="token keyword">let</span> z <span class="token operator">=</span> <span class="token number">0xFF</span>
+======
\ No newline at end of file
diff --git a/tests/languages/gleam/operators.test b/tests/languages/gleam/operators.test
new file mode 100644
index 0000000000..d23a3b9729
--- /dev/null
+++ b/tests/languages/gleam/operators.test
@@ -0,0 +1,7 @@
+======
+Operators
+======
+[1, 2] |> list.map(fn(x) { x + 1 })
+======
+<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span> <span class="token operator">|&gt;</span> <span class="token function">list</span><span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token keyword">fn</span><span class="token punctuation">(</span>x<span class="token punctuation">)</span> <span class="token punctuation">{</span> x <span class="token operator">+</span> <span class="token number">1</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
+======
\ No newline at end of file
diff --git a/tests/languages/gleam/types.test b/tests/languages/gleam/types.test
new file mode 100644
index 0000000000..ff5a146aad
--- /dev/null
+++ b/tests/languages/gleam/types.test
@@ -0,0 +1,9 @@
+======
+Types and constructors
+======
+type Result(a, b) { Ok(a) Error(b) }
+Ok(42)
+======
+<span class="token keyword">type</span> <span class="token class-name">Result</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token class-name">Ok</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token class-name">Error</span><span class="token punctuation">(</span>b<span class="token punctuation">)</span> <span class="token punctuation">}</span>
+<span class="token class-name">Ok</span><span class="token punctuation">(</span><span class="token number">42</span><span class="token punctuation">)</span>
+======
\ No newline at end of file