--- /dev/null
+/**
+ * Copyright (c) 2017 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { CircularList, IInsertEvent } from 'common/CircularList';
+import { IBuffer, BufferIndex, IBufferStringIterator, IBufferStringIteratorResult } from 'common/buffer/Types';
+import { IBufferLine, ICellData, IAttributeData, ICharset } from 'common/Types';
+import { BufferLine, DEFAULT_ATTR_DATA } from 'common/buffer/BufferLine';
+import { CellData } from 'common/buffer/CellData';
+import { NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE, WHITESPACE_CELL_CHAR, WHITESPACE_CELL_WIDTH, WHITESPACE_CELL_CODE, CHAR_DATA_WIDTH_INDEX, CHAR_DATA_CHAR_INDEX } from 'common/buffer/Constants';
+import { reflowLargerApplyNewLayout, reflowLargerCreateNewLayout, reflowLargerGetLinesToRemove, reflowSmallerGetNewLineLengths, getWrappedLineTrimmedLength } from 'common/buffer/BufferReflow';
+import { Marker } from 'common/buffer/Marker';
+import { IOptionsService, IBufferService } from 'common/services/Services';
+import { DEFAULT_CHARSET } from 'common/data/Charsets';
+
+export const MAX_BUFFER_SIZE = 4294967295; // 2^32 - 1
+
+/**
+ * This class represents a terminal buffer (an internal state of the terminal), where the
+ * following information is stored (in high-level):
+ * - text content of this particular buffer
+ * - cursor position
+ * - scroll position
+ */
+export class Buffer implements IBuffer {
+ public lines: CircularList<IBufferLine>;
+ public ydisp: number = 0;
+ public ybase: number = 0;
+ public y: number = 0;
+ public x: number = 0;
+ public scrollBottom: number;
+ public scrollTop: number;
+ // TODO: Type me
+ public tabs: any;
+ public savedY: number = 0;
+ public savedX: number = 0;
+ public savedCurAttrData = DEFAULT_ATTR_DATA.clone();
+ public savedCharset: ICharset | null = DEFAULT_CHARSET;
+ public markers: Marker[] = [];
+ private _nullCell: ICellData = CellData.fromCharData([0, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]);
+ private _whitespaceCell: ICellData = CellData.fromCharData([0, WHITESPACE_CELL_CHAR, WHITESPACE_CELL_WIDTH, WHITESPACE_CELL_CODE]);
+ private _cols: number;
+ private _rows: number;
+
+ constructor(
+ private _hasScrollback: boolean,
+ private _optionsService: IOptionsService,
+ private _bufferService: IBufferService
+ ) {
+ this._cols = this._bufferService.cols;
+ this._rows = this._bufferService.rows;
+ this.lines = new CircularList<IBufferLine>(this._getCorrectBufferLength(this._rows));
+ this.scrollTop = 0;
+ this.scrollBottom = this._rows - 1;
+ this.setupTabStops();
+ }
+
+ public getNullCell(attr?: IAttributeData): ICellData {
+ if (attr) {
+ this._nullCell.fg = attr.fg;
+ this._nullCell.bg = attr.bg;
+ } else {
+ this._nullCell.fg = 0;
+ this._nullCell.bg = 0;
+ }
+ return this._nullCell;
+ }
+
+ public getWhitespaceCell(attr?: IAttributeData): ICellData {
+ if (attr) {
+ this._whitespaceCell.fg = attr.fg;
+ this._whitespaceCell.bg = attr.bg;
+ } else {
+ this._whitespaceCell.fg = 0;
+ this._whitespaceCell.bg = 0;
+ }
+ return this._whitespaceCell;
+ }
+
+ public getBlankLine(attr: IAttributeData, isWrapped?: boolean): IBufferLine {
+ return new BufferLine(this._bufferService.cols, this.getNullCell(attr), isWrapped);
+ }
+
+ public get hasScrollback(): boolean {
+ return this._hasScrollback && this.lines.maxLength > this._rows;
+ }
+
+ public get isCursorInViewport(): boolean {
+ const absoluteY = this.ybase + this.y;
+ const relativeY = absoluteY - this.ydisp;
+ return (relativeY >= 0 && relativeY < this._rows);
+ }
+
+ /**
+ * Gets the correct buffer length based on the rows provided, the terminal's
+ * scrollback and whether this buffer is flagged to have scrollback or not.
+ * @param rows The terminal rows to use in the calculation.
+ */
+ private _getCorrectBufferLength(rows: number): number {
+ if (!this._hasScrollback) {
+ return rows;
+ }
+
+ const correctBufferLength = rows + this._optionsService.options.scrollback;
+
+ return correctBufferLength > MAX_BUFFER_SIZE ? MAX_BUFFER_SIZE : correctBufferLength;
+ }
+
+ /**
+ * Fills the buffer's viewport with blank lines.
+ */
+ public fillViewportRows(fillAttr?: IAttributeData): void {
+ if (this.lines.length === 0) {
+ if (fillAttr === undefined) {
+ fillAttr = DEFAULT_ATTR_DATA;
+ }
+ let i = this._rows;
+ while (i--) {
+ this.lines.push(this.getBlankLine(fillAttr));
+ }
+ }
+ }
+
+ /**
+ * Clears the buffer to it's initial state, discarding all previous data.
+ */
+ public clear(): void {
+ this.ydisp = 0;
+ this.ybase = 0;
+ this.y = 0;
+ this.x = 0;
+ this.lines = new CircularList<IBufferLine>(this._getCorrectBufferLength(this._rows));
+ this.scrollTop = 0;
+ this.scrollBottom = this._rows - 1;
+ this.setupTabStops();
+ }
+
+ /**
+ * Resizes the buffer, adjusting its data accordingly.
+ * @param newCols The new number of columns.
+ * @param newRows The new number of rows.
+ */
+ public resize(newCols: number, newRows: number): void {
+ // store reference to null cell with default attrs
+ const nullCell = this.getNullCell(DEFAULT_ATTR_DATA);
+
+ // Increase max length if needed before adjustments to allow space to fill
+ // as required.
+ const newMaxLength = this._getCorrectBufferLength(newRows);
+ if (newMaxLength > this.lines.maxLength) {
+ this.lines.maxLength = newMaxLength;
+ }
+
+ // The following adjustments should only happen if the buffer has been
+ // initialized/filled.
+ if (this.lines.length > 0) {
+ // Deal with columns increasing (reducing needs to happen after reflow)
+ if (this._cols < newCols) {
+ for (let i = 0; i < this.lines.length; i++) {
+ this.lines.get(i)!.resize(newCols, nullCell);
+ }
+ }
+
+ // Resize rows in both directions as needed
+ let addToY = 0;
+ if (this._rows < newRows) {
+ for (let y = this._rows; y < newRows; y++) {
+ if (this.lines.length < newRows + this.ybase) {
+ if (this._optionsService.options.windowsMode) {
+ // Just add the new missing rows on Windows as conpty reprints the screen with it's
+ // view of the world. Once a line enters scrollback for conpty it remains there
+ this.lines.push(new BufferLine(newCols, nullCell));
+ } else {
+ if (this.ybase > 0 && this.lines.length <= this.ybase + this.y + addToY + 1) {
+ // There is room above the buffer and there are no empty elements below the line,
+ // scroll up
+ this.ybase--;
+ addToY++;
+ if (this.ydisp > 0) {
+ // Viewport is at the top of the buffer, must increase downwards
+ this.ydisp--;
+ }
+ } else {
+ // Add a blank line if there is no buffer left at the top to scroll to, or if there
+ // are blank lines after the cursor
+ this.lines.push(new BufferLine(newCols, nullCell));
+ }
+ }
+ }
+ }
+ } else { // (this._rows >= newRows)
+ for (let y = this._rows; y > newRows; y--) {
+ if (this.lines.length > newRows + this.ybase) {
+ if (this.lines.length > this.ybase + this.y + 1) {
+ // The line is a blank line below the cursor, remove it
+ this.lines.pop();
+ } else {
+ // The line is the cursor, scroll down
+ this.ybase++;
+ this.ydisp++;
+ }
+ }
+ }
+ }
+
+ // Reduce max length if needed after adjustments, this is done after as it
+ // would otherwise cut data from the bottom of the buffer.
+ if (newMaxLength < this.lines.maxLength) {
+ // Trim from the top of the buffer and adjust ybase and ydisp.
+ const amountToTrim = this.lines.length - newMaxLength;
+ if (amountToTrim > 0) {
+ this.lines.trimStart(amountToTrim);
+ this.ybase = Math.max(this.ybase - amountToTrim, 0);
+ this.ydisp = Math.max(this.ydisp - amountToTrim, 0);
+ this.savedY = Math.max(this.savedY - amountToTrim, 0);
+ }
+ this.lines.maxLength = newMaxLength;
+ }
+
+ // Make sure that the cursor stays on screen
+ this.x = Math.min(this.x, newCols - 1);
+ this.y = Math.min(this.y, newRows - 1);
+ if (addToY) {
+ this.y += addToY;
+ }
+ this.savedX = Math.min(this.savedX, newCols - 1);
+
+ this.scrollTop = 0;
+ }
+
+ this.scrollBottom = newRows - 1;
+
+ if (this._isReflowEnabled) {
+ this._reflow(newCols, newRows);
+
+ // Trim the end of the line off if cols shrunk
+ if (this._cols > newCols) {
+ for (let i = 0; i < this.lines.length; i++) {
+ this.lines.get(i)!.resize(newCols, nullCell);
+ }
+ }
+ }
+
+ this._cols = newCols;
+ this._rows = newRows;
+ }
+
+ private get _isReflowEnabled(): boolean {
+ return this._hasScrollback && !this._optionsService.options.windowsMode;
+ }
+
+ private _reflow(newCols: number, newRows: number): void {
+ if (this._cols === newCols) {
+ return;
+ }
+
+ // Iterate through rows, ignore the last one as it cannot be wrapped
+ if (newCols > this._cols) {
+ this._reflowLarger(newCols, newRows);
+ } else {
+ this._reflowSmaller(newCols, newRows);
+ }
+ }
+
+ private _reflowLarger(newCols: number, newRows: number): void {
+ const toRemove: number[] = reflowLargerGetLinesToRemove(this.lines, this._cols, newCols, this.ybase + this.y, this.getNullCell(DEFAULT_ATTR_DATA));
+ if (toRemove.length > 0) {
+ const newLayoutResult = reflowLargerCreateNewLayout(this.lines, toRemove);
+ reflowLargerApplyNewLayout(this.lines, newLayoutResult.layout);
+ this._reflowLargerAdjustViewport(newCols, newRows, newLayoutResult.countRemoved);
+ }
+ }
+
+ private _reflowLargerAdjustViewport(newCols: number, newRows: number, countRemoved: number): void {
+ const nullCell = this.getNullCell(DEFAULT_ATTR_DATA);
+ // Adjust viewport based on number of items removed
+ let viewportAdjustments = countRemoved;
+ while (viewportAdjustments-- > 0) {
+ if (this.ybase === 0) {
+ if (this.y > 0) {
+ this.y--;
+ }
+ if (this.lines.length < newRows) {
+ // Add an extra row at the bottom of the viewport
+ this.lines.push(new BufferLine(newCols, nullCell));
+ }
+ } else {
+ if (this.ydisp === this.ybase) {
+ this.ydisp--;
+ }
+ this.ybase--;
+ }
+ }
+ this.savedY = Math.max(this.savedY - countRemoved, 0);
+ }
+
+ private _reflowSmaller(newCols: number, newRows: number): void {
+ const nullCell = this.getNullCell(DEFAULT_ATTR_DATA);
+ // Gather all BufferLines that need to be inserted into the Buffer here so that they can be
+ // batched up and only committed once
+ const toInsert = [];
+ let countToInsert = 0;
+ // Go backwards as many lines may be trimmed and this will avoid considering them
+ for (let y = this.lines.length - 1; y >= 0; y--) {
+ // Check whether this line is a problem
+ let nextLine = this.lines.get(y) as BufferLine;
+ if (!nextLine || !nextLine.isWrapped && nextLine.getTrimmedLength() <= newCols) {
+ continue;
+ }
+
+ // Gather wrapped lines and adjust y to be the starting line
+ const wrappedLines: BufferLine[] = [nextLine];
+ while (nextLine.isWrapped && y > 0) {
+ nextLine = this.lines.get(--y) as BufferLine;
+ wrappedLines.unshift(nextLine);
+ }
+
+ // If these lines contain the cursor don't touch them, the program will handle fixing up
+ // wrapped lines with the cursor
+ const absoluteY = this.ybase + this.y;
+ if (absoluteY >= y && absoluteY < y + wrappedLines.length) {
+ continue;
+ }
+
+ const lastLineLength = wrappedLines[wrappedLines.length - 1].getTrimmedLength();
+ const destLineLengths = reflowSmallerGetNewLineLengths(wrappedLines, this._cols, newCols);
+ const linesToAdd = destLineLengths.length - wrappedLines.length;
+ let trimmedLines: number;
+ if (this.ybase === 0 && this.y !== this.lines.length - 1) {
+ // If the top section of the buffer is not yet filled
+ trimmedLines = Math.max(0, this.y - this.lines.maxLength + linesToAdd);
+ } else {
+ trimmedLines = Math.max(0, this.lines.length - this.lines.maxLength + linesToAdd);
+ }
+
+ // Add the new lines
+ const newLines: BufferLine[] = [];
+ for (let i = 0; i < linesToAdd; i++) {
+ const newLine = this.getBlankLine(DEFAULT_ATTR_DATA, true) as BufferLine;
+ newLines.push(newLine);
+ }
+ if (newLines.length > 0) {
+ toInsert.push({
+ // countToInsert here gets the actual index, taking into account other inserted items.
+ // using this we can iterate through the list forwards
+ start: y + wrappedLines.length + countToInsert,
+ newLines
+ });
+ countToInsert += newLines.length;
+ }
+ wrappedLines.push(...newLines);
+
+ // Copy buffer data to new locations, this needs to happen backwards to do in-place
+ let destLineIndex = destLineLengths.length - 1; // Math.floor(cellsNeeded / newCols);
+ let destCol = destLineLengths[destLineIndex]; // cellsNeeded % newCols;
+ if (destCol === 0) {
+ destLineIndex--;
+ destCol = destLineLengths[destLineIndex];
+ }
+ let srcLineIndex = wrappedLines.length - linesToAdd - 1;
+ let srcCol = lastLineLength;
+ while (srcLineIndex >= 0) {
+ const cellsToCopy = Math.min(srcCol, destCol);
+ wrappedLines[destLineIndex].copyCellsFrom(wrappedLines[srcLineIndex], srcCol - cellsToCopy, destCol - cellsToCopy, cellsToCopy, true);
+ destCol -= cellsToCopy;
+ if (destCol === 0) {
+ destLineIndex--;
+ destCol = destLineLengths[destLineIndex];
+ }
+ srcCol -= cellsToCopy;
+ if (srcCol === 0) {
+ srcLineIndex--;
+ const wrappedLinesIndex = Math.max(srcLineIndex, 0);
+ srcCol = getWrappedLineTrimmedLength(wrappedLines, wrappedLinesIndex, this._cols);
+ }
+ }
+
+ // Null out the end of the line ends if a wide character wrapped to the following line
+ for (let i = 0; i < wrappedLines.length; i++) {
+ if (destLineLengths[i] < newCols) {
+ wrappedLines[i].setCell(destLineLengths[i], nullCell);
+ }
+ }
+
+ // Adjust viewport as needed
+ let viewportAdjustments = linesToAdd - trimmedLines;
+ while (viewportAdjustments-- > 0) {
+ if (this.ybase === 0) {
+ if (this.y < newRows - 1) {
+ this.y++;
+ this.lines.pop();
+ } else {
+ this.ybase++;
+ this.ydisp++;
+ }
+ } else {
+ // Ensure ybase does not exceed its maximum value
+ if (this.ybase < Math.min(this.lines.maxLength, this.lines.length + countToInsert) - newRows) {
+ if (this.ybase === this.ydisp) {
+ this.ydisp++;
+ }
+ this.ybase++;
+ }
+ }
+ }
+ this.savedY = Math.min(this.savedY + linesToAdd, this.ybase + newRows - 1);
+ }
+
+ // Rearrange lines in the buffer if there are any insertions, this is done at the end rather
+ // than earlier so that it's a single O(n) pass through the buffer, instead of O(n^2) from many
+ // costly calls to CircularList.splice.
+ if (toInsert.length > 0) {
+ // Record buffer insert events and then play them back backwards so that the indexes are
+ // correct
+ const insertEvents: IInsertEvent[] = [];
+
+ // Record original lines so they don't get overridden when we rearrange the list
+ const originalLines: BufferLine[] = [];
+ for (let i = 0; i < this.lines.length; i++) {
+ originalLines.push(this.lines.get(i) as BufferLine);
+ }
+ const originalLinesLength = this.lines.length;
+
+ let originalLineIndex = originalLinesLength - 1;
+ let nextToInsertIndex = 0;
+ let nextToInsert = toInsert[nextToInsertIndex];
+ this.lines.length = Math.min(this.lines.maxLength, this.lines.length + countToInsert);
+ let countInsertedSoFar = 0;
+ for (let i = Math.min(this.lines.maxLength - 1, originalLinesLength + countToInsert - 1); i >= 0; i--) {
+ if (nextToInsert && nextToInsert.start > originalLineIndex + countInsertedSoFar) {
+ // Insert extra lines here, adjusting i as needed
+ for (let nextI = nextToInsert.newLines.length - 1; nextI >= 0; nextI--) {
+ this.lines.set(i--, nextToInsert.newLines[nextI]);
+ }
+ i++;
+
+ // Create insert events for later
+ insertEvents.push({
+ index: originalLineIndex + 1,
+ amount: nextToInsert.newLines.length
+ });
+
+ countInsertedSoFar += nextToInsert.newLines.length;
+ nextToInsert = toInsert[++nextToInsertIndex];
+ } else {
+ this.lines.set(i, originalLines[originalLineIndex--]);
+ }
+ }
+
+ // Update markers
+ let insertCountEmitted = 0;
+ for (let i = insertEvents.length - 1; i >= 0; i--) {
+ insertEvents[i].index += insertCountEmitted;
+ this.lines.onInsertEmitter.fire(insertEvents[i]);
+ insertCountEmitted += insertEvents[i].amount;
+ }
+ const amountToTrim = Math.max(0, originalLinesLength + countToInsert - this.lines.maxLength);
+ if (amountToTrim > 0) {
+ this.lines.onTrimEmitter.fire(amountToTrim);
+ }
+ }
+ }
+
+ // private _reflowSmallerGetLinesNeeded()
+
+ /**
+ * Translates a string index back to a BufferIndex.
+ * To get the correct buffer position the string must start at `startCol` 0
+ * (default in translateBufferLineToString).
+ * The method also works on wrapped line strings given rows were not trimmed.
+ * The method operates on the CharData string length, there are no
+ * additional content or boundary checks. Therefore the string and the buffer
+ * should not be altered in between.
+ * TODO: respect trim flag after fixing #1685
+ * @param lineIndex line index the string was retrieved from
+ * @param stringIndex index within the string
+ * @param startCol column offset the string was retrieved from
+ */
+ public stringIndexToBufferIndex(lineIndex: number, stringIndex: number, trimRight: boolean = false): BufferIndex {
+ while (stringIndex) {
+ const line = this.lines.get(lineIndex);
+ if (!line) {
+ return [-1, -1];
+ }
+ const length = (trimRight) ? line.getTrimmedLength() : line.length;
+ for (let i = 0; i < length; ++i) {
+ if (line.get(i)[CHAR_DATA_WIDTH_INDEX]) {
+ // empty cells report a string length of 0, but get replaced
+ // with a whitespace in translateToString, thus replace with 1
+ stringIndex -= line.get(i)[CHAR_DATA_CHAR_INDEX].length || 1;
+ }
+ if (stringIndex < 0) {
+ return [lineIndex, i];
+ }
+ }
+ lineIndex++;
+ }
+ return [lineIndex, 0];
+ }
+
+ /**
+ * Translates a buffer line to a string, with optional start and end columns.
+ * Wide characters will count as two columns in the resulting string. This
+ * function is useful for getting the actual text underneath the raw selection
+ * position.
+ * @param line The line being translated.
+ * @param trimRight Whether to trim whitespace to the right.
+ * @param startCol The column to start at.
+ * @param endCol The column to end at.
+ */
+ public translateBufferLineToString(lineIndex: number, trimRight: boolean, startCol: number = 0, endCol?: number): string {
+ const line = this.lines.get(lineIndex);
+ if (!line) {
+ return '';
+ }
+ return line.translateToString(trimRight, startCol, endCol);
+ }
+
+ public getWrappedRangeForLine(y: number): { first: number, last: number } {
+ let first = y;
+ let last = y;
+ // Scan upwards for wrapped lines
+ while (first > 0 && this.lines.get(first)!.isWrapped) {
+ first--;
+ }
+ // Scan downwards for wrapped lines
+ while (last + 1 < this.lines.length && this.lines.get(last + 1)!.isWrapped) {
+ last++;
+ }
+ return { first, last };
+ }
+
+ /**
+ * Setup the tab stops.
+ * @param i The index to start setting up tab stops from.
+ */
+ public setupTabStops(i?: number): void {
+ if (i !== null && i !== undefined) {
+ if (!this.tabs[i]) {
+ i = this.prevStop(i);
+ }
+ } else {
+ this.tabs = {};
+ i = 0;
+ }
+
+ for (; i < this._cols; i += this._optionsService.options.tabStopWidth) {
+ this.tabs[i] = true;
+ }
+ }
+
+ /**
+ * Move the cursor to the previous tab stop from the given position (default is current).
+ * @param x The position to move the cursor to the previous tab stop.
+ */
+ public prevStop(x?: number): number {
+ if (x === null || x === undefined) {
+ x = this.x;
+ }
+ while (!this.tabs[--x] && x > 0);
+ return x >= this._cols ? this._cols - 1 : x < 0 ? 0 : x;
+ }
+
+ /**
+ * Move the cursor one tab stop forward from the given position (default is current).
+ * @param x The position to move the cursor one tab stop forward.
+ */
+ public nextStop(x?: number): number {
+ if (x === null || x === undefined) {
+ x = this.x;
+ }
+ while (!this.tabs[++x] && x < this._cols);
+ return x >= this._cols ? this._cols - 1 : x < 0 ? 0 : x;
+ }
+
+ public addMarker(y: number): Marker {
+ const marker = new Marker(y);
+ this.markers.push(marker);
+ marker.register(this.lines.onTrim(amount => {
+ marker.line -= amount;
+ // The marker should be disposed when the line is trimmed from the buffer
+ if (marker.line < 0) {
+ marker.dispose();
+ }
+ }));
+ marker.register(this.lines.onInsert(event => {
+ if (marker.line >= event.index) {
+ marker.line += event.amount;
+ }
+ }));
+ marker.register(this.lines.onDelete(event => {
+ // Delete the marker if it's within the range
+ if (marker.line >= event.index && marker.line < event.index + event.amount) {
+ marker.dispose();
+ }
+
+ // Shift the marker if it's after the deleted range
+ if (marker.line > event.index) {
+ marker.line -= event.amount;
+ }
+ }));
+ marker.register(marker.onDispose(() => this._removeMarker(marker)));
+ return marker;
+ }
+
+ private _removeMarker(marker: Marker): void {
+ this.markers.splice(this.markers.indexOf(marker), 1);
+ }
+
+ public iterator(trimRight: boolean, startIndex?: number, endIndex?: number, startOverscan?: number, endOverscan?: number): IBufferStringIterator {
+ return new BufferStringIterator(this, trimRight, startIndex, endIndex, startOverscan, endOverscan);
+ }
+}
+
+/**
+ * Iterator to get unwrapped content strings from the buffer.
+ * The iterator returns at least the string data between the borders
+ * `startIndex` and `endIndex` (exclusive) and will expand the lines
+ * by `startOverscan` to the top and by `endOverscan` to the bottom,
+ * if no new line was found in between.
+ * It will never read/return string data beyond `startIndex - startOverscan`
+ * or `endIndex + endOverscan`. Therefore the first and last line might be truncated.
+ * It is possible to always get the full string for the first and last line as well
+ * by setting the overscan values to the actual buffer length. This not recommended
+ * since it might return the whole buffer within a single string in a worst case scenario.
+ */
+export class BufferStringIterator implements IBufferStringIterator {
+ private _current: number;
+
+ constructor (
+ private _buffer: IBuffer,
+ private _trimRight: boolean,
+ private _startIndex: number = 0,
+ private _endIndex: number = _buffer.lines.length,
+ private _startOverscan: number = 0,
+ private _endOverscan: number = 0
+ ) {
+ if (this._startIndex < 0) {
+ this._startIndex = 0;
+ }
+ if (this._endIndex > this._buffer.lines.length) {
+ this._endIndex = this._buffer.lines.length;
+ }
+ this._current = this._startIndex;
+ }
+
+ public hasNext(): boolean {
+ return this._current < this._endIndex;
+ }
+
+ public next(): IBufferStringIteratorResult {
+ const range = this._buffer.getWrappedRangeForLine(this._current);
+ // limit search window to overscan value at both borders
+ if (range.first < this._startIndex - this._startOverscan) {
+ range.first = this._startIndex - this._startOverscan;
+ }
+ if (range.last > this._endIndex + this._endOverscan) {
+ range.last = this._endIndex + this._endOverscan;
+ }
+ // limit to current buffer length
+ range.first = Math.max(range.first, 0);
+ range.last = Math.min(range.last, this._buffer.lines.length);
+ let result = '';
+ for (let i = range.first; i <= range.last; ++i) {
+ result += this._buffer.translateBufferLineToString(i, this._trimRight);
+ }
+ this._current = range.last + 1;
+ return {range: range, content: result};
+ }
+}
projects / VSoRC / .git / blobdiff