139 lines
4.6 KiB
JavaScript
139 lines
4.6 KiB
JavaScript
import { isTag, isText } from "domhandler";
|
|
import { filter, findOne } from "./querying.js";
|
|
/**
|
|
* A map of functions to check nodes against.
|
|
*/
|
|
const Checks = {
|
|
tag_name(name) {
|
|
if (typeof name === "function") {
|
|
return (elem) => isTag(elem) && name(elem.name);
|
|
}
|
|
else if (name === "*") {
|
|
return isTag;
|
|
}
|
|
return (elem) => isTag(elem) && elem.name === name;
|
|
},
|
|
tag_type(type) {
|
|
if (typeof type === "function") {
|
|
return (elem) => type(elem.type);
|
|
}
|
|
return (elem) => elem.type === type;
|
|
},
|
|
tag_contains(data) {
|
|
if (typeof data === "function") {
|
|
return (elem) => isText(elem) && data(elem.data);
|
|
}
|
|
return (elem) => isText(elem) && elem.data === data;
|
|
},
|
|
};
|
|
/**
|
|
* Returns a function to check whether a node has an attribute with a particular
|
|
* value.
|
|
*
|
|
* @param attrib Attribute to check.
|
|
* @param value Attribute value to look for.
|
|
* @returns A function to check whether the a node has an attribute with a
|
|
* particular value.
|
|
*/
|
|
function getAttribCheck(attrib, value) {
|
|
if (typeof value === "function") {
|
|
return (elem) => isTag(elem) && value(elem.attribs[attrib]);
|
|
}
|
|
return (elem) => isTag(elem) && elem.attribs[attrib] === value;
|
|
}
|
|
/**
|
|
* Returns a function that returns `true` if either of the input functions
|
|
* returns `true` for a node.
|
|
*
|
|
* @param a First function to combine.
|
|
* @param b Second function to combine.
|
|
* @returns A function taking a node and returning `true` if either of the input
|
|
* functions returns `true` for the node.
|
|
*/
|
|
function combineFuncs(a, b) {
|
|
return (elem) => a(elem) || b(elem);
|
|
}
|
|
/**
|
|
* Returns a function that executes all checks in `options` and returns `true`
|
|
* if any of them match a node.
|
|
*
|
|
* @param options An object describing nodes to look for.
|
|
* @returns A function that executes all checks in `options` and returns `true`
|
|
* if any of them match a node.
|
|
*/
|
|
function compileTest(options) {
|
|
const funcs = Object.keys(options).map((key) => {
|
|
const value = options[key];
|
|
return Object.prototype.hasOwnProperty.call(Checks, key)
|
|
? Checks[key](value)
|
|
: getAttribCheck(key, value);
|
|
});
|
|
return funcs.length === 0 ? null : funcs.reduce(combineFuncs);
|
|
}
|
|
/**
|
|
* Checks whether a node matches the description in `options`.
|
|
*
|
|
* @category Legacy Query Functions
|
|
* @param options An object describing nodes to look for.
|
|
* @param node The element to test.
|
|
* @returns Whether the element matches the description in `options`.
|
|
*/
|
|
export function testElement(options, node) {
|
|
const test = compileTest(options);
|
|
return test ? test(node) : true;
|
|
}
|
|
/**
|
|
* Returns all nodes that match `options`.
|
|
*
|
|
* @category Legacy Query Functions
|
|
* @param options An object describing nodes to look for.
|
|
* @param nodes Nodes to search through.
|
|
* @param recurse Also consider child nodes.
|
|
* @param limit Maximum number of nodes to return.
|
|
* @returns All nodes that match `options`.
|
|
*/
|
|
export function getElements(options, nodes, recurse, limit = Infinity) {
|
|
const test = compileTest(options);
|
|
return test ? filter(test, nodes, recurse, limit) : [];
|
|
}
|
|
/**
|
|
* Returns the node with the supplied ID.
|
|
*
|
|
* @category Legacy Query Functions
|
|
* @param id The unique ID attribute value to look for.
|
|
* @param nodes Nodes to search through.
|
|
* @param recurse Also consider child nodes.
|
|
* @returns The node with the supplied ID.
|
|
*/
|
|
export function getElementById(id, nodes, recurse = true) {
|
|
if (!Array.isArray(nodes))
|
|
nodes = [nodes];
|
|
return findOne(getAttribCheck("id", id), nodes, recurse);
|
|
}
|
|
/**
|
|
* Returns all nodes with the supplied `tagName`.
|
|
*
|
|
* @category Legacy Query Functions
|
|
* @param tagName Tag name to search for.
|
|
* @param nodes Nodes to search through.
|
|
* @param recurse Also consider child nodes.
|
|
* @param limit Maximum number of nodes to return.
|
|
* @returns All nodes with the supplied `tagName`.
|
|
*/
|
|
export function getElementsByTagName(tagName, nodes, recurse = true, limit = Infinity) {
|
|
return filter(Checks["tag_name"](tagName), nodes, recurse, limit);
|
|
}
|
|
/**
|
|
* Returns all nodes with the supplied `type`.
|
|
*
|
|
* @category Legacy Query Functions
|
|
* @param type Element type to look for.
|
|
* @param nodes Nodes to search through.
|
|
* @param recurse Also consider child nodes.
|
|
* @param limit Maximum number of nodes to return.
|
|
* @returns All nodes with the supplied `type`.
|
|
*/
|
|
export function getElementsByTagType(type, nodes, recurse = true, limit = Infinity) {
|
|
return filter(Checks["tag_type"](type), nodes, recurse, limit);
|
|
}
|
|
//# sourceMappingURL=legacy.js.map
|