forked from daren.hsu/line_push
70 lines
2.0 KiB
JavaScript
70 lines
2.0 KiB
JavaScript
import NodeType from './type';
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import Node from './node';
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/**
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* TextNode to contain a text element in DOM tree.
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* @param {string} value [description]
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*/
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export default class TextNode extends Node {
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constructor(rawText, parentNode) {
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super(parentNode);
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this.rawText = rawText;
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/**
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* Node Type declaration.
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* @type {Number}
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*/
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this.nodeType = NodeType.TEXT_NODE;
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}
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/**
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* Returns text with all whitespace trimmed except single leading/trailing non-breaking space
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*/
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get trimmedText() {
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if (this._trimmedText !== undefined)
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return this._trimmedText;
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const text = this.rawText;
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let i = 0;
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let startPos;
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let endPos;
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while (i >= 0 && i < text.length) {
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if (/\S/.test(text[i])) {
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if (startPos === undefined) {
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startPos = i;
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i = text.length;
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}
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else {
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endPos = i;
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i = void 0;
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}
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}
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if (startPos === undefined)
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i++;
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else
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i--;
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}
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if (startPos === undefined)
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startPos = 0;
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if (endPos === undefined)
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endPos = text.length - 1;
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const hasLeadingSpace = startPos > 0 && /[^\S\r\n]/.test(text[startPos - 1]);
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const hasTrailingSpace = endPos < (text.length - 1) && /[^\S\r\n]/.test(text[endPos + 1]);
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this._trimmedText = (hasLeadingSpace ? ' ' : '') + text.slice(startPos, endPos + 1) + (hasTrailingSpace ? ' ' : '');
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return this._trimmedText;
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}
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/**
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* Get unescaped text value of current node and its children.
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* @return {string} text content
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*/
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get text() {
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return this.rawText;
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}
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/**
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* Detect if the node contains only white space.
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* @return {bool}
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*/
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get isWhitespace() {
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return /^(\s| )*$/.test(this.rawText);
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}
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toString() {
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return this.text;
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}
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}
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