gersemi
Version:
182 lines • 13.4 kB
JavaScript
import * as XML from './XML';
export class Parser {
static doc(xml) {
return Parser.parser.parseFromString(xml, 'text/xml');
}
static dom(xml) {
return new Wrap(Parser.doc(xml).documentElement);
}
static json(xml) {
return Parser.dom(xml).json();
}
}
Parser.parser = new DOMParser();
export class Wrap {
constructor(element) {
this.element = element;
this.kids = null;
this.kidMap = null;
this.attrs = null;
}
static list(elements) {
const wrapped = [];
for (const element of elements) {
if ('children' in element) {
wrapped.push(new Wrap(element));
}
}
return wrapped;
}
static map(list) {
const map = {};
for (const wrap of list) {
const name = wrap.name;
if (!(name in map)) {
map[name] = [];
}
map[name].push(wrap);
}
return map;
}
query(selector) {
const elements = this.element.querySelectorAll(selector);
return elements.length === 1 ? new Wrap(elements[0]) : Wrap.list(elements);
}
attr(name) {
return this.element.getAttribute(name);
}
hasAttributes() {
return this.element.hasAttributes();
}
get attributes() {
if (this.attrs === null) {
this.attrs = {};
const attrs = this.element.attributes;
for (let i = 0; i < attrs.length; i++) {
const attr = attrs.item(i);
this.attrs[attr.name] = attr.value;
}
}
return this.attrs;
}
get children() {
if (this.kids === null) {
this.kids = Wrap.list(this.element.children);
}
return this.kids;
}
get childMap() {
if (this.kidMap === null) {
this.kidMap = Wrap.map(this.children);
}
return this.kidMap;
}
prop(name) {
const val = this.element[name];
if (val instanceof Element) {
return new Wrap(val);
}
return val;
}
each(fn) {
for (const child of this.children) {
const ret = fn(child);
if (ret === false) {
break;
}
}
return this;
}
get targetNamespace() {
let tns = this.attr('targetNamespace');
if (!tns && this.parent) {
tns = this.parent['targetNamespace'];
}
return tns;
}
isParent() {
return this.children.length > 0;
}
get parent() {
const parent = this.element.parentElement;
return parent === null ? null : new Wrap(parent);
}
get document() {
return this.element.ownerDocument;
}
get name() {
return this.element.id || this.attr('name') || this.type;
}
get type() {
return this.attr('type') || this.element.nodeName;
}
get text() {
return this.element.textContent || '';
}
get value() {
return this.isParent() ? ToJSON.any(this) : this.parsed;
}
get parsed() {
return ToJSON.string(this.text);
}
json() {
return ToJSON.root(this);
}
xml() {
return XML.fromJSON(this.json());
}
toString(nice = true) {
const element = this.xml();
return nice ? element.toNiceString() : element.toString();
}
}
export class ToJSON {
static string(s) {
try {
return JSON.parse(s);
}
catch (e) {
return s;
}
}
static root(wrap) {
const root = {};
root[wrap.name] = ToJSON.any(wrap);
return root;
}
static any(wrap) {
return wrap.isParent()
? ToJSON.isArrayLike(wrap)
? ToJSON.array(wrap.children)
: ToJSON.object(wrap)
: wrap.hasAttributes()
? {
_attributes: wrap.attributes,
_value: ToJSON.string(wrap.text),
}
: ToJSON.string(wrap.text);
}
static array(list) {
const arr = [];
for (const wrap of list) {
arr.push(ToJSON.root(wrap));
}
return arr;
}
static object(wrap) {
const obj = {};
for (const name in wrap.childMap) {
const wraps = wrap.childMap[name];
obj[name] = wraps.length > 1 ? ToJSON.array(wraps) : ToJSON.any(wraps[0]);
}
if (wrap.hasAttributes()) {
obj._attributes = wrap.attributes;
}
return obj;
}
static isArrayLike(wrap) {
return ((wrap.children.length > 1 && Object.keys(wrap.childMap).length === 1) ||
(wrap.children.length <= 1 && wrap.name.endsWith('s')));
}
}
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