Syntax highlighting for Rocker .rocker.html template files — a Java-based, statically typed templating engine.

Features

Control flow — @if, @else if, @else, @for, @while, @with highlighted as keywords
Expressions — @variable, @object.method(), @Class.staticMethod() with dot-chain coloring
Template calls — @Template.template(args) with full argument highlighting
Declarations — @args type signatures with generic support (Map<String, Object>)
Imports — @import statements
Java literals — strings, numbers, true / false / null, primitive types
Operators — !=, ==, &&, ||, ++, --, +, and comparison operators
Block delimiters — { and } visually distinct from surrounding HTML
Injection grammar — Rocker expressions inside HTML attribute values are highlighted correctly, including deeply nested calls like @Util.method(map.get("key"+"suffix"))
Light & dark theme support — color rules adapt to both light and dark VS Code themes

Preview

Example 1 — Control flow & nested expressions:

Before	After

@if, @for keywords, chained method calls like map.get("alert").get("alertCount"), operators, and block delimiters { } highlighted alongside standard HTML tags.

Example 2 — File header: imports, args & template calls:

Before	After

@import statements, @args with nested Java generic types (Map<String,Map<String,Object>>), @Template.template() calls, and @@ escape sequence — all distinct from surrounding HTML and CSS.

Example 3 — Complex template call with type casts & chained arguments:

Before	After

@Template.template() call with Java type casts (String), deeply chained method calls, string arguments, and boolean literals — all tokenized correctly in a single line.

Example 4 — Rocker expressions inside HTML attribute values:

Before	After

Rocker expressions embedded inside HTML attribute strings — @variable.method() chaining and @Class.staticMethod() calls with string concatenation arguments are highlighted correctly without breaking the surrounding HTML attribute syntax.

Requirements

No additional dependencies. The extension activates automatically for files matching *.rocker.html.

Known Issues

Comparison operator color — The less-than and greater-than operators used inside @if / @for conditions may render with a theme-dependent color in some edge cases instead of the standard operator color. This is a TextMate grammar priority conflict between the Rocker grammar and the base HTML grammar. Compound operators such as !=, ==, &&, and || are not affected.