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frontend/app/utils/lean/lean-language.ts
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252
frontend/app/utils/lean/lean-language.ts
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/* The Lean 4 language for Monaco — registered once, client-side.
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*
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* A Monarch tokenizer (keywords, tactics, commands, the nested `/- -/`
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* comments Lean uses for docstrings) plus themes built from the wiki's live
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* palette, so the editor matches the page around it and follows the wiki's
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* theme *and* accent switches live: the accent — caret, selection, active
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* line number, keywords — is sampled from the `--accent` custom properties
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* that `[data-accent]` swaps. (Lean's own server also offers semantic
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* highlighting; keyword colours are the honest first pass — see the note in
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* lean/README.) */
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import * as monaco from 'monaco-editor'
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export const LEAN_LANGUAGE = 'lean4'
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export const LEAN_THEMES = { light: 'mathew-light', dark: 'mathew-dark' } as const
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/* words that introduce declarations, terms, and structuring */
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const keywords = [
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'abstract', 'axiom', 'by', 'cases', 'catch', 'class', 'command', 'deriving', 'do',
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'else', 'end', 'example', 'expansion', 'explicit', 'export', 'def', 'theorem',
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'lemma', 'corollary', 'proposition', 'instance', 'structure', 'inductive', 'abbrev',
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'mutual', 'namespace', 'section', 'open', 'protected', 'private', 'partial',
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'noncomputable', 'set_option', 'unset_option', 'option', 'attribute', 'variable',
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'variables', 'include', 'hiding', 'renaming', 'as', 'where', 'from', 'show',
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'have', 'suffices', 'let', 'in', 'if', 'then', 'match', 'with', 'without', 'fun',
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'forall', 'at', 'using', 'via', 'override', 'obsolete', 'inherit', 'field',
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'generalizing', 'replacing', 'renaming', 'specializing', 'unshuffling', 'case',
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'dive', 'guard', 'modifies', 'macro', 'macro_rules', 'syntax', 'elab', 'elab_rules',
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'notation', 'infix', 'infixl', 'infixr', 'prefix', 'postfix', 'binders',
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'declare_syntax_cat', 'syntax_cat', 'extend', 'scoped', 'unused', 'auto_unfold',
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'extern', 'implemented_by', 'native_decide', 'lift', 'coe', 'coe_struct',
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'classical', 'decidable', 'universe', 'universes', 'exit',
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]
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/* tactics — the words after `by` and inside tactic blocks */
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const tactics = [
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'intro', 'intros', 'exact', 'apply', 'refine', 'have', 'obtain', 'use', 'exists',
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'constructor', 'left', 'right', 'simp', 'simp_all', 'simp_rw', 'rw', 'rewrite',
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'show', 'conv', 'calc', 'ring', 'ring_nf', 'field_simp', 'norm_num', 'omega',
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'linarith', 'nlinarith', 'positivity', 'decide', 'trivial', 'rfl', 'refl', 'symm',
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'trans', 'ext', 'funext', 'congr', 'congr!', 'cases', 'induction', 'rcases',
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'obtain', 'subst', 'contradiction', 'exfalso', 'push_neg', 'contrapose',
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'constructor', 'aesop', 'tauto', 'bv_decide', 'gcongr', 'change', 'generalize',
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'revert', 'clear', 'rename_i', 'next', 'any_goals', 'all_goals', 'focus', 'dotl',
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'by_contra', 'by_contra!', 'apply_fun', 'congr_arg', 'congrFun', 'congrArg',
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'simpa', 'simpa using', 'norm_cast', 'exact?', 'apply?', 'sorry', 'native_decide',
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'unfold', 'dsimp', 'unfold_projs', 'whisker', 'thm_to_tactic', 'tauto', 'mt',
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'absurd', 'injection', 'no_index', 'guard_goals', 'expect_failure', 'stop', 'skip',
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'trace', 'log', 'sleep', 'wait', 'recover', 'error',
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]
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const commands = ['#check', '#eval', '#reduce', '#synth', '#print', '#exit', '#where', '#hole', '#why', '#loogle', '#guard']
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let registered = false
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export function registerLeanLanguage() {
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if (registered) return
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registered = true
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monaco.languages.register({ id: LEAN_LANGUAGE })
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monaco.languages.setLanguageConfiguration(LEAN_LANGUAGE, {
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comments: { lineComment: '--', blockComment: ['/-', '-/'] },
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brackets: [
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['{', '}'], ['[', ']'], ['(', ')'],
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['⟨', '⟩'], ['⟦', '⟧'], ['‹', '›'], ['⦃', '⦄'], ['⁅', '⁆'], ['⌈', '⌉'], ['⌊', '⌋'],
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],
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autoClosingPairs: [
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{ open: '{', close: '}' }, { open: '[', close: ']' }, { open: '(', close: ')' },
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{ open: '"', close: '"' }, { open: '/-', close: '-/' },
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{ open: '⟨', close: '⟩' }, { open: '⟦', close: '⟧' }, { open: '‹', close: '›' },
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],
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surroundingPairs: [
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{ open: '{', close: '}' }, { open: '[', close: ']' }, { open: '(', close: ')' },
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{ open: '"', close: '"' }, { open: '⟨', close: '⟩' }, { open: '⟦', close: '⟧' },
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{ open: '‹', close: '›' },
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],
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indentationRules: {
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increaseIndentPattern: /^\s*(\bby\b|\bdo\b|\bthen\b|\bcalc\b|\{[^}]*$|\[[^\]]*$|\([^)]*$)/,
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decreaseIndentPattern: /^\s*(\bend\b|\}|\\|\)|\/-})/,
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},
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})
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monaco.languages.setMonarchTokensProvider(LEAN_LANGUAGE, {
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keywords,
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tactics,
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commands,
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tokenizer: {
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root: [
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[/--.*$/, 'comment'],
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[/\/-/, { token: 'comment', next: '@blockcomment' }],
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[/"/, { token: 'string', next: '@string' }],
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[/[0-9]+\.[0-9]+([eE][-+]?[0-9]+)?/, 'number.float'],
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[/[0-9]+([eE][-+]?[0-9]+)?[nNzQqR]?/, 'number'],
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[
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// one identifier run (ascii word, or a unicode run — Lean names
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// carry α, →, ≤, ⁻¹), then decided against the word lists
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/[a-zA-Z_#][a-zA-Z0-9_?!'∆∇]*|[^\x00-\x7F][a-zA-Z0-9_?!'∆∇]*/,
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{
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cases: {
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'@commands': 'keyword.command',
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'@tactics': 'keyword.tactic',
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'@keywords': 'keyword',
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'@default': 'identifier',
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},
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},
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],
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[/^\s*@\[[^\]]*\]/, 'annotation'],
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[/[→←↔∧∨¬∀∃≠≤≥<>!=+\-*/^|&~:;.,@#][=]?/, 'operator'],
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],
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blockcomment: [
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[/\/-/, { token: 'comment', next: '@blockcomment' }],
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[/-\//, { token: 'comment', next: '@pop' }],
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[/[^\-\/]+/, 'comment'],
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[/[\/-]/, 'comment'],
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],
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string: [
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[/[^\\"]+/, 'string'],
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[/\\./, 'string.escape'],
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[/"/, { token: 'string', next: '@pop' }],
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],
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},
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})
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}
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/* ---------- the wiki's palette, read live, as editor themes ---------- */
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/* Monaco themes are plain hex, not CSS variables, so the accent is sampled
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* off the document each time a theme is built — the same read the canvas
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* surfaces make. The fallbacks are violet, the wiki's default accent. */
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function wikiAccent(dark: boolean) {
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const css = getComputedStyle(document.documentElement)
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const at = (name: string, fallback: string) => css.getPropertyValue(name).trim() || fallback
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return {
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accent: at('--accent', dark ? '#7c8cff' : '#4f5fe8'),
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strong: at('--accent-strong', dark ? '#99a5ff' : '#3d4dd6'),
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second: at('--accent-2', dark ? '#38d3ee' : '#0ea5c9'),
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}
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}
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/* `#rrggbbaa` — Monaco's translucent form, standing in for the wiki's
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* `color-mix`. Shorthand hex is widened; anything else passes through. */
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function alpha(hex: string, a: string) {
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if (/^#[0-9a-f]{3}$/i.test(hex)) return `#${hex.slice(1).split('').map(c => c + c).join('')}${a}`
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return /^#[0-9a-f]{6}$/i.test(hex) ? `${hex}${a}` : hex
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}
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/* token rules take hex without the leading `#` */
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function ink(hex: string) {
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return hex.replace(/^#/, '')
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}
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/* Themes are named by their palette (mathew-dark-fb7185…): a new accent
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* yields a fresh theme rather than one Monaco may have cached under an old
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* palette, and a reader cycling back reuses a definition already made. */
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const definedThemes = new Set<string>()
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/* the theme matching the wiki right now — [data-theme] picks the surfaces,
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* [data-accent] the caret, selection, active line number and keywords */
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export function currentLeanTheme(): string {
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const dark = document.documentElement.getAttribute('data-theme') === 'dark'
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const a = wikiAccent(dark)
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const name = `${dark ? LEAN_THEMES.dark : LEAN_THEMES.light}-${ink(a.accent)}-${ink(a.strong)}-${ink(a.second)}`.toLowerCase()
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if (definedThemes.has(name)) return name
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definedThemes.add(name)
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monaco.editor.defineTheme(name, dark
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? {
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base: 'vs-dark',
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inherit: true,
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rules: [
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{ token: 'keyword', foreground: ink(a.strong) },
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{ token: 'keyword.tactic', foreground: '38d3ee' },
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{ token: 'keyword.command', foreground: ink(a.strong), fontStyle: 'bold' },
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{ token: 'string', foreground: '3fce8b' },
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{ token: 'number', foreground: 'f5a83c' },
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{ token: 'comment', foreground: '6b7488', fontStyle: 'italic' },
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{ token: 'annotation', foreground: '99a1b5' },
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{ token: 'operator', foreground: '99a1b5' },
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{ token: 'type.identifier', foreground: '38d3ee' },
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],
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colors: {
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'editor.background': '#141826',
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'editor.foreground': '#e7eaf3',
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'editor.lineHighlightBackground': '#1a2030',
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'editorLineNumber.foreground': '#6b7488',
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'editorLineNumber.activeForeground': a.accent,
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'editorCursor.foreground': a.accent,
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'editor.selectionBackground': alpha(a.accent, '40'),
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'editor.selectionHighlightBackground': alpha(a.accent, '1f'),
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'editorIndentGuide.background1': '#232a3c',
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'editorIndentGuide.activeBackground1': '#313a52',
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'editorWhitespace.foreground': '#313a52',
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'editorWidget.background': '#10131c',
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'editorWidget.border': '#232a3c',
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'editorSuggestWidget.selectedBackground': '#1a2030',
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'editorHoverWidget.background': '#10131c',
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'editorHoverWidget.border': '#232a3c',
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'scrollbarSlider.background': '#e7eaf329',
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'scrollbarSlider.hoverBackground': '#e7eaf347',
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'scrollbarSlider.activeBackground': '#e7eaf366',
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'editorError.foreground': '#f47085',
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'editorWarning.foreground': '#f5a83c',
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'editorInfo.foreground': a.second,
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},
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}
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: {
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base: 'vs',
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inherit: true,
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rules: [
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{ token: 'keyword', foreground: ink(a.strong) },
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{ token: 'keyword.tactic', foreground: '0891b2' },
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{ token: 'keyword.command', foreground: ink(a.strong), fontStyle: 'bold' },
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{ token: 'string', foreground: '189a5c' },
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{ token: 'number', foreground: 'd97706' },
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{ token: 'comment', foreground: '8a93a8', fontStyle: 'italic' },
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{ token: 'annotation', foreground: '5b6478' },
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{ token: 'operator', foreground: '5b6478' },
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{ token: 'type.identifier', foreground: '0891b2' },
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],
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colors: {
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'editor.background': '#ffffff',
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'editor.foreground': '#1b2130',
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'editor.lineHighlightBackground': '#eef1f7',
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'editorLineNumber.foreground': '#8a93a8',
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'editorLineNumber.activeForeground': a.accent,
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'editorCursor.foreground': a.accent,
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'editor.selectionBackground': alpha(a.accent, '33'),
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'editor.selectionHighlightBackground': alpha(a.accent, '1a'),
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'editorIndentGuide.background1': '#e2e6ef',
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'editorIndentGuide.activeBackground1': '#cfd5e3',
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'editorWhitespace.foreground': '#cfd5e3',
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'editorWidget.background': '#ffffff',
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'editorWidget.border': '#e2e6ef',
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'editorSuggestWidget.selectedBackground': '#eef1f7',
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'editorHoverWidget.background': '#ffffff',
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'editorHoverWidget.border': '#e2e6ef',
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'scrollbarSlider.background': '#1b213024',
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'scrollbarSlider.hoverBackground': '#1b21304d',
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'scrollbarSlider.activeBackground': '#1b213066',
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'editorError.foreground': '#d1344b',
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'editorWarning.foreground': '#d97706',
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'editorInfo.foreground': a.second,
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},
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})
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return name
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}
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/* move the editor to the palette the wiki is wearing right now */
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export function applyLeanTheme() {
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monaco.editor.setTheme(currentLeanTheme())
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}
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