66 lines
2.9 KiB
TypeScript
66 lines
2.9 KiB
TypeScript
/**
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* Matcher shared by both hook dialects. Claude treats alphanumeric/underscore/
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* pipe patterns as literal alternatives and other patterns as regex; Codex
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* treats every non-empty pattern as an unanchored regex. Missing, empty, and
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* `*` match all. Runtime matching contains invalid regexes as non-matches;
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* config parsers use {@link matcherDiagnostic} to reject them with a diagnostic.
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* @module @deepseek-ai/dsh-hook-protocol/matcher
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*/
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import type { MatcherMode } from './types.ts'
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/** True for an absent / empty / `'*'` pattern — the match-all sentinels. */
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function isMatchAll(matcher: string | undefined): boolean {
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return matcher === undefined || matcher === '' || matcher === '*'
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}
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/** A Claude-literal pattern is purely word chars + `|` (the regex-vs-literal discriminator). */
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const CLAUDE_LITERAL = /^[A-Za-z0-9_|]+$/
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/** Compile an unanchored matcher regex; invalid patterns return `undefined`. */
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function compileRegex(pattern: string): RegExp | undefined {
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try {
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return new RegExp(pattern)
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} catch (_syntaxError) {
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// RegExp construction is the try's only operation, so malformed pattern
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// syntax is the only expected failure.
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return undefined
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}
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}
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/**
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* Validate one matcher before a bridge accepts its config group.
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* @param matcher - configured pattern; match-all sentinels are valid.
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* @param mode - dialect deciding whether a word-and-pipe pattern is literal.
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* @returns `undefined` for a valid matcher, otherwise a stable diagnostic.
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*/
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export function matcherDiagnostic(matcher: string | undefined, mode: MatcherMode): string | undefined {
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if (isMatchAll(matcher)) return undefined
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const pattern = matcher as string
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if (mode === 'claude' && CLAUDE_LITERAL.test(pattern)) return undefined
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return compileRegex(pattern) === undefined
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? `invalid ${mode} regex matcher ${JSON.stringify(pattern)}`
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: undefined
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}
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/**
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* Whether `matcher` selects `query` under the given dialect. Claude literal
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* patterns exact-match pipe-separated alternatives; all other patterns are
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* unanchored regexes. Invalid regexes return `false` rather than throwing;
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* bridge config parsers surface them through {@link matcherDiagnostic} before use.
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* @param matcher - the configured pattern; absent/empty/`'*'` are the match-all sentinels.
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* @param query - the candidate value (a tool name, a session source, …).
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* @param mode - the dialect deciding literal-vs-regex interpretation of the pattern.
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* @returns `true` when the pattern selects the query; `false` on a non-match or an invalid
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* regex.
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*/
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export function matchesMatcher(matcher: string | undefined, query: string, mode: MatcherMode): boolean {
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if (isMatchAll(matcher)) return true
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// matcher is a non-empty string past the match-all guard.
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const pattern = matcher as string
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if (mode === 'claude' && CLAUDE_LITERAL.test(pattern)) {
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return pattern.split('|').includes(query)
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}
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return compileRegex(pattern)?.test(query) ?? false
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}
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