Source code for syntax highlighters

Idiomatic hello-world programs and realistic snippets across sixteen languages, exercising comments, string escapes, interpolation, numeric literals, and language keywords, for testing syntax highlighters, editor themes, and tree-sitter grammars.

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117 test families · 121 available files · Page 1 of 7

C Struct

C struct SAMPLE for clangd / highlighter fixtures.

File: C · C
Use case: Syntax highlighting / Code parsing

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C: Hello World

The classic hello-world in C (an include, main, and printf) for testing highlighters, C compilers, and parsers against the canonical first program.

File: C · C
Use case: Syntax highlighting / Code parsing

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C: Linked list (structs, malloc, pointers)

A realistic C program: a singly linked list with a typedef struct, malloc/free memory management, pointer walking, and error handling, for testing highlighters, compilers, and static analysers.

File: C · C
Use case: Syntax highlighting / Code parsing

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Csharp

C# Fibonacci

A small C# iterator Fibonacci utility: realistic snippet for language tooling.

File: CS · Csharp
Use case: Syntax highlighting / Code parsing

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Csharp

C# Hello

Idiomatic C# hello-world for syntax highlighters and Roslyn-style parsers.

File: CS · Csharp
Use case: Syntax highlighting / Code parsing

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Csharp

C# LINQ SAMPLE

C# LINQ chain SAMPLE for Roslyn fixtures.

File: CS · Csharp
Use case: Syntax highlighting / Code parsing

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C++

C++ Optional

C++17 optional SAMPLE for clangd fixtures.

File: CPP · C++ · cpp
Use case: Syntax highlighting / Code parsing

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C++

C++: Hello World

The classic hello-world in C++: iostream and std::cout, for testing highlighters, C++ compilers, and parsers.

File: CPP · C++
Use case: Syntax highlighting / Code parsing

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C++

C++: Series (class template, STL)

A realistic C++ snippet with a class template, STL algorithms (max_element, accumulate), std::move, and range handling, for testing highlighters, g++/clang++, and parsers against real templates.

File: CPP · C++
Use case: Syntax highlighting / Code parsing

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Clojure

Clojure Hello

Minimal Clojure hello for CIDER / clj-kondo fixtures.

File: CLJ · Clojure
Use case: Syntax highlighting / Code parsing

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Clojure

Clojure Reduce

Clojure reduce utility: realistic snippet.

File: CLJ · Clojure
Use case: Syntax highlighting / Code parsing

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Clojure

Clojure Thread Macro

Clojure thread-first macro for highlighter tests.

File: CLJ · Clojure
Use case: Syntax highlighting / Code parsing

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Csharp

Csharp Lint Invalid: Empty Catch Invalid

Intentionally lint-bait SAMPLE csharp snippet (empty-catch-invalid) for rule-engine tests.

File: CS · Csharp
Use case: Code parsing / Syntax highlighting

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Css

CSS: Component styles (variables, flexbox, keyframes)

A realistic component stylesheet using custom properties, flexbox, a fluid clamp() font size, color-mix(), a keyframe animation, and a media query, for testing CSS parsers, linters (stylelint), and highlighters.