111 lines
2.8 KiB
JavaScript
111 lines
2.8 KiB
JavaScript
class ObjectNavigator {
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constructor(raw = null) {
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if (Array.isArray(raw))
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this.raw = raw;
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else
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this.raw = [raw];
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}
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makeSelector(selector) {
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const result = [];
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selector = selector.trim();
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//последний индекс не учитывется, только если не задан явно
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if (selector && selector[selector.length - 1] == ']')
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selector += '/';
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const levels = selector.split('/');
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for (const level of levels) {
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const [name, indexPart] = level.split('[');
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let index = 0;
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if (indexPart) {
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const i = indexPart.indexOf(']');
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index = parseInt(indexPart.substring(0, i), 10) || 0;
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}
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result.push({name, index});
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}
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if (result.length);
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result[result.length - 1].last = true;
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return result;
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}
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select(selector = '') {
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selector = this.makeSelector(selector);
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let raw = this.raw;
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for (const s of selector) {
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if (s.name) {
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raw = raw[0];
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if (typeof(raw) === 'object' && !Array.isArray(raw))
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raw = raw[s.name];
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else
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raw = null;
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if (raw !== null && !s.last) {
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if (Array.isArray(raw))
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raw = raw[s.index];
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else if (s.index > 0)
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raw = null;
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}
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} else {
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raw = raw[s.index];
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}
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if (raw === undefined || raw === null) {
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raw = null;
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break;
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}
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if (!Array.isArray(raw))
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raw = [raw];
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}
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if (raw === null)
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return null;
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const result = [];
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for (const r of raw)
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result.push(new ObjectNavigator(r));
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return result;
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}
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$$(selector) {
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return this.select(selector);
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}
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$(selector) {
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const res = this.select(selector);
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return (res !== null && res.length ? res[0] : null);
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}
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get value() {
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return (this.raw.length ? this.raw[0] : null);
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}
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text(selector = '') {
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const res = this.$(`${selector}/*TEXT`);
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return (res ? res.value : null);
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}
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comment(selector = '') {
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const res = this.$(`${selector}/*COMMENT`);
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return (res ? res.value : null);
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}
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cdata(selector = '') {
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const res = this.$(`${selector}/*CDATA`);
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return (res ? res.value : null);
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}
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attrs(selector = '') {
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const res = this.$(`${selector}/*ATTRS`);
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return (res ? res.value : null);
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}
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}
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module.exports = ObjectNavigator; |