132 lines
2.9 KiB
JavaScript
132 lines
2.9 KiB
JavaScript
'use strict'
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module.exports = adapterFactory;
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function adapterFactory(implementation){
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ensureImplementation(implementation);
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var adapter = {}
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var baseAdapter = {
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removeSubsets: function (nodes){
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return removeSubsets(adapter, nodes);
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},
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existsOne: function(test, elems){
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return existsOne(adapter, test, elems);
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},
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getSiblings: function(elem){
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return getSiblings(adapter, elem);
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},
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hasAttrib: function(elem, name){
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return hasAttrib(adapter, elem, name);
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},
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findOne: function(test, arr){
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return findOne(adapter, test, arr);
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},
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findAll: function(test, elems){
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return findAll(adapter, test, elems)
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}
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};
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Object.assign(adapter, baseAdapter, implementation);
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return adapter;
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}
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var expectImplemented = [
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"isTag", "getAttributeValue", "getChildren", "getName", "getParent",
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"getText"
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];
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function ensureImplementation(implementation){
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if(!implementation) throw new TypeError("Expected implementation")
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var notImplemented = expectImplemented.filter(function(fname){
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return typeof implementation[fname] !== "function";
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});
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if(notImplemented.length){
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var notList = "(" + notImplemented.join(", ") + ")";
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var message = "Expected functions " + notList + " to be implemented";
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throw new Error(message);
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}
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}
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function removeSubsets(adapter, nodes){
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var idx = nodes.length, node, ancestor, replace;
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// Check if each node (or one of its ancestors) is already contained in the
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// array.
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while(--idx > -1){
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node = ancestor = nodes[idx];
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// Temporarily remove the node under consideration
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nodes[idx] = null;
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replace = true;
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while(ancestor){
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if(nodes.indexOf(ancestor) > -1){
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replace = false;
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nodes.splice(idx, 1);
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break;
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}
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ancestor = adapter.getParent(ancestor)
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}
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// If the node has been found to be unique, re-insert it.
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if(replace){
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nodes[idx] = node;
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}
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}
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return nodes;
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}
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function existsOne(adapter, test, elems){
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return elems.some(function(elem){
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return adapter.isTag(elem) ?
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test(elem) || adapter.existsOne(test, adapter.getChildren(elem)) :
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false;
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});
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}
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function getSiblings(adapter, elem){
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var parent = adapter.getParent(elem);
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return parent && adapter.getChildren(parent);
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}
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function hasAttrib(adapter, elem, name){
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return adapter.getAttributeValue(elem,name) !== undefined
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}
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function findOne(adapter, test, arr){
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var elem = null;
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for(var i = 0, l = arr.length; i < l && !elem; i++){
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if(test(arr[i])){
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elem = arr[i];
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} else {
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var childs = adapter.getChildren(arr[i]);
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if(childs && childs.length > 0){
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elem = adapter.findOne(test, childs);
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}
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}
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}
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return elem;
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}
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function findAll(adapter, test, elems){
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var result = [];
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for(var i = 0, j = elems.length; i < j; i++){
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if(!adapter.isTag(elems[i])) continue;
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if(test(elems[i])) result.push(elems[i]);
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var childs = adapter.getChildren(elems[i]);
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if(childs) result = result.concat(adapter.findAll(test, childs));
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}
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return result;
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}
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