95 lines
3.2 KiB
TypeScript
95 lines
3.2 KiB
TypeScript
/**
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* Copyright (c) 2018 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { CharData, ICellData, IExtendedAttrs } from 'common/Types';
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import { stringFromCodePoint } from 'common/input/TextDecoder';
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import { CHAR_DATA_CHAR_INDEX, CHAR_DATA_WIDTH_INDEX, CHAR_DATA_ATTR_INDEX, Content } from 'common/buffer/Constants';
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import { AttributeData, ExtendedAttrs } from 'common/buffer/AttributeData';
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/**
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* CellData - represents a single Cell in the terminal buffer.
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*/
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export class CellData extends AttributeData implements ICellData {
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/** Helper to create CellData from CharData. */
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public static fromCharData(value: CharData): CellData {
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const obj = new CellData();
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obj.setFromCharData(value);
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return obj;
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}
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/** Primitives from terminal buffer. */
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public content = 0;
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public fg = 0;
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public bg = 0;
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public extended: IExtendedAttrs = new ExtendedAttrs();
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public combinedData = '';
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/** Whether cell contains a combined string. */
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public isCombined(): number {
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return this.content & Content.IS_COMBINED_MASK;
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}
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/** Width of the cell. */
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public getWidth(): number {
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return this.content >> Content.WIDTH_SHIFT;
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}
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/** JS string of the content. */
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public getChars(): string {
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if (this.content & Content.IS_COMBINED_MASK) {
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return this.combinedData;
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}
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if (this.content & Content.CODEPOINT_MASK) {
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return stringFromCodePoint(this.content & Content.CODEPOINT_MASK);
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}
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return '';
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}
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/**
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* Codepoint of cell
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* Note this returns the UTF32 codepoint of single chars,
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* if content is a combined string it returns the codepoint
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* of the last char in string to be in line with code in CharData.
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*/
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public getCode(): number {
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return (this.isCombined())
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? this.combinedData.charCodeAt(this.combinedData.length - 1)
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: this.content & Content.CODEPOINT_MASK;
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}
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/** Set data from CharData */
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public setFromCharData(value: CharData): void {
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this.fg = value[CHAR_DATA_ATTR_INDEX];
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this.bg = 0;
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let combined = false;
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// surrogates and combined strings need special treatment
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if (value[CHAR_DATA_CHAR_INDEX].length > 2) {
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combined = true;
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}
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else if (value[CHAR_DATA_CHAR_INDEX].length === 2) {
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const code = value[CHAR_DATA_CHAR_INDEX].charCodeAt(0);
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// if the 2-char string is a surrogate create single codepoint
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// everything else is combined
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if (0xD800 <= code && code <= 0xDBFF) {
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const second = value[CHAR_DATA_CHAR_INDEX].charCodeAt(1);
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if (0xDC00 <= second && second <= 0xDFFF) {
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this.content = ((code - 0xD800) * 0x400 + second - 0xDC00 + 0x10000) | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
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}
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else {
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combined = true;
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}
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}
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else {
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combined = true;
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}
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}
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else {
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this.content = value[CHAR_DATA_CHAR_INDEX].charCodeAt(0) | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
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}
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if (combined) {
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this.combinedData = value[CHAR_DATA_CHAR_INDEX];
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this.content = Content.IS_COMBINED_MASK | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
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}
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}
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/** Get data as CharData. */
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public getAsCharData(): CharData {
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return [this.fg, this.getChars(), this.getWidth(), this.getCode()];
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}
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}
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