/**
 * The `Tool(content)` rule SYNTAX — the one reader every rule face shares, as a LEAF module.
 *
 * Two modules read this grammar and, until this file existed, one imported it from the other: the rule
 * DSL compiler (`permission-rules.ts`) declared the parser and the persisted-rule model
 * (`permission-rule-model.ts`) imported it. The model's command/path grammars are now consumed by the
 * compiler too (a content-form `deny`/`ask` rule compiles through the model's own validator and
 * matcher), which would have closed a value-import cycle between the two. The syntax layer has no
 * dependency of its own, so it lives here and both read DOWN.
 *
 * Upstream parity: `Lh` (the split), `Dju`/`Pju` (the escape-aware paren search), `Hju` (the three
 * unescapes) — INCLUDING the lenient downgrades (malformed parens / trailing garbage ⇒ the WHOLE string
 * becomes the bare tool name). The strict complement that refuses the downgrades is the compiler's
 * validator, not this reader.
 */
/** Parse result — the tool name and, for a `Tool(content)` spelling, its unescaped content. */
export interface ParsedPermissionRule {
    toolName: string;
    ruleContent?: string;
}
/** First index of `ch` preceded by an EVEN number of backslashes. */
export declare function indexOfUnescaped(s: string, ch: string): number;
/** Last index of `ch` preceded by an EVEN number of backslashes. */
export declare function lastIndexOfUnescaped(s: string, ch: string): number;
/**
 * Parse one rule string, including the lenient downgrades (malformed parens / trailing garbage ⇒ the
 * WHOLE string becomes the bare tool name). Use the compiler's `validatePermissionRules` (or the policy
 * factory) to refuse the downgrades.
 */
export declare function parsePermissionRule(rule: string): ParsedPermissionRule;
/**
 * Can a rule name this tool name — is it the rule syntax's name head ({@link RULE_TOOL_NAME}) and not the lone `*`? The
 * lone `*` is the wildcard (every tool), not a name: a tool called `*` could never be granted or refused on its own. The
 * mount contract for every name a caller tool answers to (its name and each alias), so each one is a name every list can
 * write; a protocol-minted name (`<ns>__<peer>__<tool>`, segments in `[A-Za-z0-9_-]`) is always one.
 */
export declare function isNameableToolName(name: string): boolean;
/**
 * One rule entry read by the rule syntax, or `undefined` when the syntax cannot read it: blanks around it, a tool name (the
 * text before the first unescaped `(`, as written) outside {@link RULE_TOOL_NAME}, or a `(` the parse cannot close at the
 * entry's end (the lenient parser's downgrade: the whole string read as a name); otherwise {@link parsePermissionRule}'s
 * reading. THE test of "this is a rule spelling" — every entry list's reader asks it before any rule grammar reads the
 * content (what the parentheses hold, a parenthesis or a control character included, is that grammar's to judge).
 */
export declare function ruleSpellingOf(rule: string): ParsedPermissionRule | undefined;