@sema-agent/core/dist/core/permission-rule-syntax.js

Stateless, task-oriented AI agent core

function escapedAt(s, i) {
    let backslashes = 0;
    for (let j = i - 1; j >= 0 && s[j] === "\\"; j--)
        backslashes++;
    return backslashes % 2 === 1;
}
export function indexOfUnescaped(s, ch) {
    for (let i = 0; i < s.length; i++)
        if (s[i] === ch && !escapedAt(s, i))
            return i;
    return -1;
}
export function lastIndexOfUnescaped(s, ch) {
    for (let i = s.length - 1; i >= 0; i--)
        if (s[i] === ch && !escapedAt(s, i))
            return i;
    return -1;
}
function unescapeRuleContent(s) {
    return s.replaceAll("\\(", "(").replaceAll("\\)", ")").replaceAll("\\\\", "\\");
}
export function parsePermissionRule(rule) {
    const open = indexOfUnescaped(rule, "(");
    if (open === -1)
        return { toolName: rule.trim() };
    const close = lastIndexOfUnescaped(rule, ")");
    if (close === -1 || close <= open)
        return { toolName: rule.trim() };
    if (close !== rule.length - 1)
        return { toolName: rule.trim() };
    const name = rule.substring(0, open);
    const content = rule.substring(open + 1, close);
    if (!name)
        return { toolName: rule.trim() };
    if (content === "" || content === "*")
        return { toolName: name.trim() };
    return { toolName: name.trim(), ruleContent: unescapeRuleContent(content) };
}
const RULE_TOOL_NAME = /^(?:\*|[A-Za-z0-9_](?:[A-Za-z0-9_.:*-]*[A-Za-z0-9_*-])?)$/;
export function isNameableToolName(name) {
    return typeof name === "string" && name !== "*" && RULE_TOOL_NAME.test(name);
}
export function ruleSpellingOf(rule) {
    if (rule !== rule.trim())
        return undefined;
    const open = indexOfUnescaped(rule, "(");
    const name = open < 0 ? rule : rule.slice(0, open);
    if (!RULE_TOOL_NAME.test(name))
        return undefined;
    const parsed = parsePermissionRule(rule);
    return parsed.toolName === name ? parsed : undefined;
}