boris/node_modules/applesauce-content/dist/nast/find-and-replace.js

import { visitParents } from "unist-util-visit-parents";
export function findAndReplace(tree, list) {
    const pairs = list;
    let pairIndex = -1;
    const visitor = (node, parents) => {
        let index = -1;
        /** @type {Parents | undefined} */
        let grandparent;
        while (++index < parents.length) {
            const parent = parents[index];
            // const siblings = grandparent ? grandparent.children : undefined;
            grandparent = parent;
        }
        if (grandparent) {
            return handler(node, parents);
        }
        return undefined;
    };
    while (++pairIndex < pairs.length) {
        visitParents(tree, "text", visitor);
    }
    /**
     * Handle a text node which is not in an ignored parent.
     *
     * @param {Text} node
     *   Text node.
     * @param {Array<Parents>} parents
     *   Parents.
     * @returns {VisitorResult}
     *   Result.
     */
    function handler(node, parents) {
        const parent = parents[parents.length - 1];
        const find = pairs[pairIndex][0];
        const replace = pairs[pairIndex][1];
        let start = 0;
        const siblings = parent.children;
        const index = siblings.indexOf(node);
        let change = false;
        let nodes = [];
        find.lastIndex = 0;
        let match = find.exec(node.value);
        while (match) {
            const position = match.index;
            /** @type {RegExpMatchObject} */
            // const matchObject = {
            //   index: match.index,
            //   input: match.input,
            //   stack: [...parents, node],
            // };
            // let value = replace(...match, matchObject);
            let value = replace(...match);
            if (typeof value === "string") {
                value = value.length > 0 ? { type: "text", value } : undefined;
            }
            // It wasn’t a match after all.
            if (value === false) {
                // False acts as if there was no match.
                // So we need to reset `lastIndex`, which currently being at the end of
                // the current match, to the beginning.
                find.lastIndex = position + 1;
            }
            else {
                if (start !== position) {
                    nodes.push({
                        type: "text",
                        value: node.value.slice(start, position),
                    });
                }
                if (Array.isArray(value)) {
                    nodes.push(...value);
                }
                else if (value) {
                    nodes.push(value);
                }
                start = position + match[0].length;
                change = true;
            }
            if (!find.global) {
                break;
            }
            match = find.exec(node.value);
        }
        if (change) {
            if (start < node.value.length) {
                nodes.push({ type: "text", value: node.value.slice(start) });
            }
            parent.children.splice(index, 1, ...nodes);
        }
        else {
            nodes = [node];
        }
        return index + nodes.length;
    }
}