import { INTERCEPTION_ROUTE_MARKERS } from "../../../../server/future/helpers/interception-routes";
import { escapeStringRegexp } from "../../escape-regexp";
import { removeTrailingSlash } from "./remove-trailing-slash";
const NEXT_QUERY_PARAM_PREFIX = "nxtP";
const NEXT_INTERCEPTION_MARKER_PREFIX = "nxtI";
/**
 * Parses a given parameter from a route to a data structure that can be used
 * to generate the parametrized route. Examples:
 *   - `[...slug]` -> `{ key: 'slug', repeat: true, optional: true }`
 *   - `...slug` -> `{ key: 'slug', repeat: true, optional: false }`
 *   - `[foo]` -> `{ key: 'foo', repeat: false, optional: true }`
 *   - `bar` -> `{ key: 'bar', repeat: false, optional: false }`
 */ function parseParameter(param) {
    const optional = param.startsWith("[") && param.endsWith("]");
    if (optional) {
        param = param.slice(1, -1);
    }
    const repeat = param.startsWith("...");
    if (repeat) {
        param = param.slice(3);
    }
    return {
        key: param,
        repeat,
        optional
    };
}
function getParametrizedRoute(route) {
    const segments = removeTrailingSlash(route).slice(1).split("/");
    const groups = {};
    let groupIndex = 1;
    return {
        parameterizedRoute: segments.map((segment)=>{
            const markerMatch = INTERCEPTION_ROUTE_MARKERS.find((m)=>segment.startsWith(m));
            const paramMatches = segment.match(/\[((?:\[.*\])|.+)\]/) // Check for parameters
            ;
            if (markerMatch && paramMatches) {
                const { key , optional , repeat  } = parseParameter(paramMatches[1]);
                groups[key] = {
                    pos: groupIndex++,
                    repeat,
                    optional
                };
                return "/" + escapeStringRegexp(markerMatch) + "([^/]+?)";
            } else if (paramMatches) {
                const { key , repeat , optional  } = parseParameter(paramMatches[1]);
                groups[key] = {
                    pos: groupIndex++,
                    repeat,
                    optional
                };
                return repeat ? optional ? "(?:/(.+?))?" : "/(.+?)" : "/([^/]+?)";
            } else {
                return "/" + escapeStringRegexp(segment);
            }
        }).join(""),
        groups
    };
}
/**
 * From a normalized route this function generates a regular expression and
 * a corresponding groups object intended to be used to store matching groups
 * from the regular expression.
 */ export function getRouteRegex(normalizedRoute) {
    const { parameterizedRoute , groups  } = getParametrizedRoute(normalizedRoute);
    return {
        re: new RegExp("^" + parameterizedRoute + "(?:/)?$"),
        groups: groups
    };
}
/**
 * Builds a function to generate a minimal routeKey using only a-z and minimal
 * number of characters.
 */ function buildGetSafeRouteKey() {
    let routeKeyCharCode = 97;
    let routeKeyCharLength = 1;
    return ()=>{
        let routeKey = "";
        for(let i = 0; i < routeKeyCharLength; i++){
            routeKey += String.fromCharCode(routeKeyCharCode);
            routeKeyCharCode++;
            if (routeKeyCharCode > 122) {
                routeKeyCharLength++;
                routeKeyCharCode = 97;
            }
        }
        return routeKey;
    };
}
function getSafeKeyFromSegment(param) {
    let { segment , routeKeys , keyPrefix  } = param;
    const getSafeRouteKey = buildGetSafeRouteKey();
    const { key , optional , repeat  } = parseParameter(segment);
    // replace any non-word characters since they can break
    // the named regex
    let cleanedKey = key.replace(/\W/g, "");
    if (keyPrefix) {
        cleanedKey = "" + keyPrefix + cleanedKey;
    }
    let invalidKey = false;
    // check if the key is still invalid and fallback to using a known
    // safe key
    if (cleanedKey.length === 0 || cleanedKey.length > 30) {
        invalidKey = true;
    }
    if (!isNaN(parseInt(cleanedKey.slice(0, 1)))) {
        invalidKey = true;
    }
    if (invalidKey) {
        cleanedKey = getSafeRouteKey();
    }
    if (keyPrefix) {
        routeKeys[cleanedKey] = "" + keyPrefix + key;
    } else {
        routeKeys[cleanedKey] = "" + key;
    }
    return repeat ? optional ? "(?:/(?<" + cleanedKey + ">.+?))?" : "/(?<" + cleanedKey + ">.+?)" : "/(?<" + cleanedKey + ">[^/]+?)";
}
function getNamedParametrizedRoute(route, prefixRouteKeys) {
    const segments = removeTrailingSlash(route).slice(1).split("/");
    const routeKeys = {};
    return {
        namedParameterizedRoute: segments.map((segment)=>{
            const hasInterceptionMarker = INTERCEPTION_ROUTE_MARKERS.some((m)=>segment.startsWith(m));
            const paramMatches = segment.match(/\[((?:\[.*\])|.+)\]/) // Check for parameters
            ;
            if (hasInterceptionMarker && paramMatches) {
                return getSafeKeyFromSegment({
                    segment: paramMatches[1],
                    routeKeys,
                    keyPrefix: prefixRouteKeys ? NEXT_INTERCEPTION_MARKER_PREFIX : undefined
                });
            } else if (paramMatches) {
                return getSafeKeyFromSegment({
                    segment: paramMatches[1],
                    routeKeys,
                    keyPrefix: prefixRouteKeys ? NEXT_QUERY_PARAM_PREFIX : undefined
                });
            } else {
                return "/" + escapeStringRegexp(segment);
            }
        }).join(""),
        routeKeys
    };
}
/**
 * This function extends `getRouteRegex` generating also a named regexp where
 * each group is named along with a routeKeys object that indexes the assigned
 * named group with its corresponding key. When the routeKeys need to be
 * prefixed to uniquely identify internally the "prefixRouteKey" arg should
 * be "true" currently this is only the case when creating the routes-manifest
 * during the build
 */ export function getNamedRouteRegex(normalizedRoute, prefixRouteKey) {
    const result = getNamedParametrizedRoute(normalizedRoute, prefixRouteKey);
    return {
        ...getRouteRegex(normalizedRoute),
        namedRegex: "^" + result.namedParameterizedRoute + "(?:/)?$",
        routeKeys: result.routeKeys
    };
}
/**
 * Generates a named regexp.
 * This is intended to be using for build time only.
 */ export function getNamedMiddlewareRegex(normalizedRoute, options) {
    const { parameterizedRoute  } = getParametrizedRoute(normalizedRoute);
    const { catchAll =true  } = options;
    if (parameterizedRoute === "/") {
        let catchAllRegex = catchAll ? ".*" : "";
        return {
            namedRegex: "^/" + catchAllRegex + "$"
        };
    }
    const { namedParameterizedRoute  } = getNamedParametrizedRoute(normalizedRoute, false);
    let catchAllGroupedRegex = catchAll ? "(?:(/.*)?)" : "";
    return {
        namedRegex: "^" + namedParameterizedRoute + catchAllGroupedRegex + "$"
    };
}

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