json

JSON syntax highlighter. Pure (text) -> { Segment }. Mirrors the algorithm of the deleted Rust highlight_json (renderer.rs): emits object keys via lookahead-for-:, handles \ escapes inside strings, recognises numbers with scientific notation, and colors structural punctuation ({ } [ ] , :). Colors flow from ui.getToken("code.<role>") via the active theme; hardcoded fallbacks match the deleted Rust values when no theme is registered.

Exports

• highlight(text: string) -> { Segment } — tokenize a JSON string into colored segments for the zui code renderer. The module returns this function directly.

Types:

• Segment = { text: string, color: string, monospace: boolean }

Usage

local highlight = require("@builtin::modules.zui.highlight.json")
local segments  = highlight('{"a": 1, "b": "two"}')

Notes

• Pure function — no side effects, no state. Safe to call any time.
• The ui.getToken lookup runs once per highlighter call (5 FFI calls) rather than per byte, so the inner tokenize loop is allocation-light.
• Keys are disambiguated from string values by a lookahead past whitespace for : — matches the deleted Rust algorithm exactly.