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Move width shift back into enum

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This commit is contained in:
Daniel Imms
2019-04-06 14:55:43 -04:00
parent 27283e45e9
commit bb324ba9c1
3 changed files with 52 additions and 52 deletions
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src/BufferLine.ts
+44 -44
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@@ -36,7 +36,7 @@ const enum Cell {
/**
* Bitmasks for accessing data in `content`.
*/
export const enum ContentMasks {
export const enum Content {
/**
* bit 1..21 codepoint, max allowed in UTF32 is 0x10FFFF (21 bits taken)
* read: `codepoint = content & Content.codepointMask;`
@@ -44,7 +44,7 @@ export const enum ContentMasks {
* shortcut if precondition `codepoint <= 0x10FFFF` is met:
* `content |= codepoint;`
*/
CODEPOINT = 0x1FFFFF,
CODEPOINT_MASK = 0x1FFFFF,
/**
* bit 22 flag indication whether a cell contains combined content
@@ -52,7 +52,7 @@ export const enum ContentMasks {
* set: `content |= Content.isCombined;`
* clear: `content &= ~Content.isCombined;`
*/
IS_COMBINED = 0x200000, // 1 << 21
IS_COMBINED_MASK = 0x200000, // 1 << 21
/**
* bit 1..22 mask to check whether a cell contains any string data
@@ -60,7 +60,7 @@ export const enum ContentMasks {
* whether a cell contains anything
* read: `isEmtpy = !(content & Content.hasContent)`
*/
HAS_CONTENT = 0x3FFFFF,
HAS_CONTENT_MASK = 0x3FFFFF,
/**
* bit 23..24 wcwidth value of cell, takes 2 bits (ranges from 0..2)
@@ -72,10 +72,10 @@ export const enum ContentMasks {
* shortcut if precondition `0 <= width <= 3` is met:
* `content |= width << Content.widthShift;`
*/
WIDTH = 0xC00000 // 3 << 22
WIDTH_MASK = 0xC00000, // 3 << 22
WIDTH_SHIFT = 22
}
export const WIDTH_MASK_SHIFT = 22;
export enum Attributes {
/**
@@ -213,21 +213,21 @@ export class CellData extends AttributeData implements ICellData {
/** Whether cell contains a combined string. */
public isCombined(): number {
return this.content & ContentMasks.IS_COMBINED;
return this.content & Content.IS_COMBINED_MASK;
}
/** Width of the cell. */
public getWidth(): number {
return this.content >> WIDTH_MASK_SHIFT;
return this.content >> Content.WIDTH_SHIFT;
}
/** JS string of the content. */
public getChars(): string {
if (this.content & ContentMasks.IS_COMBINED) {
if (this.content & Content.IS_COMBINED_MASK) {
return this.combinedData;
}
if (this.content & ContentMasks.CODEPOINT) {
return stringFromCodePoint(this.content & ContentMasks.CODEPOINT);
if (this.content & Content.CODEPOINT_MASK) {
return stringFromCodePoint(this.content & Content.CODEPOINT_MASK);
}
return '';
}
@@ -241,7 +241,7 @@ export class CellData extends AttributeData implements ICellData {
public getCode(): number {
return (this.isCombined())
? this.combinedData.charCodeAt(this.combinedData.length - 1)
: this.content & ContentMasks.CODEPOINT;
: this.content & Content.CODEPOINT_MASK;
}
/** Set data from CharData */
@@ -260,7 +260,7 @@ export class CellData extends AttributeData implements ICellData {
if (0xD800 <= code && code <= 0xDBFF) {
const second = value[CHAR_DATA_CHAR_INDEX].charCodeAt(1);
if (0xDC00 <= second && second <= 0xDFFF) {
this.content = ((code - 0xD800) * 0x400 + second - 0xDC00 + 0x10000) | (value[CHAR_DATA_WIDTH_INDEX] << WIDTH_MASK_SHIFT);
this.content = ((code - 0xD800) * 0x400 + second - 0xDC00 + 0x10000) | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
} else {
combined = true;
}
@@ -268,11 +268,11 @@ export class CellData extends AttributeData implements ICellData {
combined = true;
}
} else {
this.content = value[CHAR_DATA_CHAR_INDEX].charCodeAt(0) | (value[CHAR_DATA_WIDTH_INDEX] << WIDTH_MASK_SHIFT);
this.content = value[CHAR_DATA_CHAR_INDEX].charCodeAt(0) | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
}
if (combined) {
this.combinedData = value[CHAR_DATA_CHAR_INDEX];
this.content = ContentMasks.IS_COMBINED | (value[CHAR_DATA_WIDTH_INDEX] << WIDTH_MASK_SHIFT);
this.content = Content.IS_COMBINED_MASK | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
}
}
@@ -320,14 +320,14 @@ export class BufferLine implements IBufferLine {
*/
public get(index: number): CharData {
const content = this._data[index * CELL_SIZE + Cell.CONTENT];
const cp = content & ContentMasks.CODEPOINT;
const cp = content & Content.CODEPOINT_MASK;
return [
this._data[index * CELL_SIZE + Cell.FG],
(content & ContentMasks.IS_COMBINED)
(content & Content.IS_COMBINED_MASK)
? this._combined[index]
: (cp) ? stringFromCodePoint(cp) : '',
content >> WIDTH_MASK_SHIFT,
(content & ContentMasks.IS_COMBINED)
content >> Content.WIDTH_SHIFT,
(content & Content.IS_COMBINED_MASK)
? this._combined[index].charCodeAt(this._combined[index].length - 1)
: cp
];
@@ -341,9 +341,9 @@ export class BufferLine implements IBufferLine {
this._data[index * CELL_SIZE + Cell.FG] = value[CHAR_DATA_ATTR_INDEX];
if (value[CHAR_DATA_CHAR_INDEX].length > 1) {
this._combined[index] = value[1];
this._data[index * CELL_SIZE + Cell.CONTENT] = index | ContentMasks.IS_COMBINED | (value[CHAR_DATA_WIDTH_INDEX] << WIDTH_MASK_SHIFT);
this._data[index * CELL_SIZE + Cell.CONTENT] = index | Content.IS_COMBINED_MASK | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
} else {
this._data[index * CELL_SIZE + Cell.CONTENT] = value[CHAR_DATA_CHAR_INDEX].charCodeAt(0) | (value[CHAR_DATA_WIDTH_INDEX] << WIDTH_MASK_SHIFT);
this._data[index * CELL_SIZE + Cell.CONTENT] = value[CHAR_DATA_CHAR_INDEX].charCodeAt(0) | (value[CHAR_DATA_WIDTH_INDEX] << Content.WIDTH_SHIFT);
}
}
@@ -352,12 +352,12 @@ export class BufferLine implements IBufferLine {
* use these when only one value is needed, otherwise use `loadCell`
*/
public getWidth(index: number): number {
return this._data[index * CELL_SIZE + Cell.CONTENT] >> WIDTH_MASK_SHIFT;
return this._data[index * CELL_SIZE + Cell.CONTENT] >> Content.WIDTH_SHIFT;
}
/** Test whether content has width. */
public hasWidth(index: number): number {
return this._data[index * CELL_SIZE + Cell.CONTENT] & ContentMasks.WIDTH;
return this._data[index * CELL_SIZE + Cell.CONTENT] & Content.WIDTH_MASK;
}
/** Get FG cell component. */
@@ -376,7 +376,7 @@ export class BufferLine implements IBufferLine {
* from real empty cells.
* */
public hasContent(index: number): number {
return this._data[index * CELL_SIZE + Cell.CONTENT] & ContentMasks.HAS_CONTENT;
return this._data[index * CELL_SIZE + Cell.CONTENT] & Content.HAS_CONTENT_MASK;
}
/**
@@ -386,25 +386,25 @@ export class BufferLine implements IBufferLine {
*/
public getCodePoint(index: number): number {
const content = this._data[index * CELL_SIZE + Cell.CONTENT];
if (content & ContentMasks.IS_COMBINED) {
if (content & Content.IS_COMBINED_MASK) {
return this._combined[index].charCodeAt(this._combined[index].length - 1);
}
return content & ContentMasks.CODEPOINT;
return content & Content.CODEPOINT_MASK;
}
/** Test whether the cell contains a combined string. */
public isCombined(index: number): number {
return this._data[index * CELL_SIZE + Cell.CONTENT] & ContentMasks.IS_COMBINED;
return this._data[index * CELL_SIZE + Cell.CONTENT] & Content.IS_COMBINED_MASK;
}
/** Returns the string content of the cell. */
public getString(index: number): string {
const content = this._data[index * CELL_SIZE + Cell.CONTENT];
if (content & ContentMasks.IS_COMBINED) {
if (content & Content.IS_COMBINED_MASK) {
return this._combined[index];
}
if (content & ContentMasks.CODEPOINT) {
return stringFromCodePoint(content & ContentMasks.CODEPOINT);
if (content & Content.CODEPOINT_MASK) {
return stringFromCodePoint(content & Content.CODEPOINT_MASK);
}
// return empty string for empty cells
return '';
@@ -419,7 +419,7 @@ export class BufferLine implements IBufferLine {
cell.content = this._data[startIndex + Cell.CONTENT];
cell.fg = this._data[startIndex + Cell.FG];
cell.bg = this._data[startIndex + Cell.BG];
if (cell.content & ContentMasks.IS_COMBINED) {
if (cell.content & Content.IS_COMBINED_MASK) {
cell.combinedData = this._combined[index];
}
return cell;
@@ -429,7 +429,7 @@ export class BufferLine implements IBufferLine {
* Set data at `index` to `cell`.
*/
public setCell(index: number, cell: ICellData): void {
if (cell.content & ContentMasks.IS_COMBINED) {
if (cell.content & Content.IS_COMBINED_MASK) {
this._combined[index] = cell.combinedData;
}
this._data[index * CELL_SIZE + Cell.CONTENT] = cell.content;
@@ -443,7 +443,7 @@ export class BufferLine implements IBufferLine {
* it gets an optimized access method.
*/
public setCellFromCodePoint(index: number, codePoint: number, width: number, fg: number, bg: number): void {
this._data[index * CELL_SIZE + Cell.CONTENT] = codePoint | (width << WIDTH_MASK_SHIFT);
this._data[index * CELL_SIZE + Cell.CONTENT] = codePoint | (width << Content.WIDTH_SHIFT);
this._data[index * CELL_SIZE + Cell.FG] = fg;
this._data[index * CELL_SIZE + Cell.BG] = bg;
}
@@ -456,21 +456,21 @@ export class BufferLine implements IBufferLine {
*/
public addCodepointToCell(index: number, codePoint: number): void {
let content = this._data[index * CELL_SIZE + Cell.CONTENT];
if (content & ContentMasks.IS_COMBINED) {
if (content & Content.IS_COMBINED_MASK) {
// we already have a combined string, simply add
this._combined[index] += stringFromCodePoint(codePoint);
} else {
if (content & ContentMasks.CODEPOINT) {
if (content & Content.CODEPOINT_MASK) {
// normal case for combining chars:
// - move current leading char + new one into combined string
// - set combined flag
this._combined[index] = stringFromCodePoint(content & ContentMasks.CODEPOINT) + stringFromCodePoint(codePoint);
content &= ~ContentMasks.CODEPOINT; // set codepoint in buffer to 0
content |= ContentMasks.IS_COMBINED;
this._combined[index] = stringFromCodePoint(content & Content.CODEPOINT_MASK) + stringFromCodePoint(codePoint);
content &= ~Content.CODEPOINT_MASK; // set codepoint in buffer to 0
content |= Content.IS_COMBINED_MASK;
} else {
// should not happen - we actually have no data in the cell yet
// simply set the data in the cell buffer with a width of 1
content = codePoint | (1 << WIDTH_MASK_SHIFT);
content = codePoint | (1 << Content.WIDTH_SHIFT);
}
this._data[index * CELL_SIZE + Cell.CONTENT] = content;
}
@@ -592,8 +592,8 @@ export class BufferLine implements IBufferLine {
public getTrimmedLength(): number {
for (let i = this.length - 1; i >= 0; --i) {
if ((this._data[i * CELL_SIZE + Cell.CONTENT] & ContentMasks.HAS_CONTENT)) {
return i + (this._data[i * CELL_SIZE + Cell.CONTENT] >> WIDTH_MASK_SHIFT);
if ((this._data[i * CELL_SIZE + Cell.CONTENT] & Content.HAS_CONTENT_MASK)) {
return i + (this._data[i * CELL_SIZE + Cell.CONTENT] >> Content.WIDTH_SHIFT);
}
}
return 0;
@@ -632,9 +632,9 @@ export class BufferLine implements IBufferLine {
let result = '';
while (startCol < endCol) {
const content = this._data[startCol * CELL_SIZE + Cell.CONTENT];
const cp = content & ContentMasks.CODEPOINT;
result += (content & ContentMasks.IS_COMBINED) ? this._combined[startCol] : (cp) ? stringFromCodePoint(cp) : WHITESPACE_CELL_CHAR;
startCol += (content >> WIDTH_MASK_SHIFT) || 1; // always advance by 1
const cp = content & Content.CODEPOINT_MASK;
result += (content & Content.IS_COMBINED_MASK) ? this._combined[startCol] : (cp) ? stringFromCodePoint(cp) : WHITESPACE_CELL_CHAR;
startCol += (content >> Content.WIDTH_SHIFT) || 1; // always advance by 1
}
return result;
}