source: node_modules/prismjs/components/prism-gdscript.js

Prism.languages.gdscript = {
        'comment': /#.*/,
        'string': {
                pattern: /@?(?:("|')(?:(?!\1)[^\n\\]|\\[\s\S])*\1(?!"|')|"""(?:[^\\]|\\[\s\S])*?""")/,
                greedy: true
        },
        'class-name': {
                // class_name Foo, extends Bar, class InnerClass
                // export(int) var baz, export(int, 0) var i
                // as Node
                // const FOO: int = 9, var bar: bool = true
                // func add(reference: Item, amount: int) -> Item:
                pattern: /(^(?:class|class_name|extends)[ \t]+|^export\([ \t]*|\bas[ \t]+|(?:\b(?:const|var)[ \t]|[,(])[ \t]*\w+[ \t]*:[ \t]*|->[ \t]*)[a-zA-Z_]\w*/m,
                lookbehind: true
        },
        'keyword': /\b(?:and|as|assert|break|breakpoint|class|class_name|const|continue|elif|else|enum|export|extends|for|func|if|in|is|master|mastersync|match|not|null|onready|or|pass|preload|puppet|puppetsync|remote|remotesync|return|self|setget|signal|static|tool|var|while|yield)\b/,
        'function': /\b[a-z_]\w*(?=[ \t]*\()/i,
        'variable': /\$\w+/,
        'number': [
                /\b0b[01_]+\b|\b0x[\da-fA-F_]+\b|(?:\b\d[\d_]*(?:\.[\d_]*)?|\B\.[\d_]+)(?:e[+-]?[\d_]+)?\b/,
                /\b(?:INF|NAN|PI|TAU)\b/
        ],
        'constant': /\b[A-Z][A-Z_\d]*\b/,
        'boolean': /\b(?:false|true)\b/,
        'operator': /->|:=|&&|\|\||<<|>>|[-+*/%&|!<>=]=?|[~^]/,
        'punctuation': /[.:,;()[\]{}]/
};