--- /dev/null
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { BufferLine } from 'common/buffer/BufferLine';
+import { CircularList } from 'common/CircularList';
+import { IBufferLine, ICellData } from 'common/Types';
+
+export interface INewLayoutResult {
+ layout: number[];
+ countRemoved: number;
+}
+
+/**
+ * Evaluates and returns indexes to be removed after a reflow larger occurs. Lines will be removed
+ * when a wrapped line unwraps.
+ * @param lines The buffer lines.
+ * @param newCols The columns after resize.
+ */
+export function reflowLargerGetLinesToRemove(lines: CircularList<IBufferLine>, oldCols: number, newCols: number, bufferAbsoluteY: number, nullCell: ICellData): number[] {
+ // Gather all BufferLines that need to be removed from the Buffer here so that they can be
+ // batched up and only committed once
+ const toRemove: number[] = [];
+
+ for (let y = 0; y < lines.length - 1; y++) {
+ // Check if this row is wrapped
+ let i = y;
+ let nextLine = lines.get(++i) as BufferLine;
+ if (!nextLine.isWrapped) {
+ continue;
+ }
+
+ // Check how many lines it's wrapped for
+ const wrappedLines: BufferLine[] = [lines.get(y) as BufferLine];
+ while (i < lines.length && nextLine.isWrapped) {
+ wrappedLines.push(nextLine);
+ nextLine = lines.get(++i) as BufferLine;
+ }
+
+ // If these lines contain the cursor don't touch them, the program will handle fixing up wrapped
+ // lines with the cursor
+ if (bufferAbsoluteY >= y && bufferAbsoluteY < i) {
+ y += wrappedLines.length - 1;
+ continue;
+ }
+
+ // Copy buffer data to new locations
+ let destLineIndex = 0;
+ let destCol = getWrappedLineTrimmedLength(wrappedLines, destLineIndex, oldCols);
+ let srcLineIndex = 1;
+ let srcCol = 0;
+ while (srcLineIndex < wrappedLines.length) {
+ const srcTrimmedTineLength = getWrappedLineTrimmedLength(wrappedLines, srcLineIndex, oldCols);
+ const srcRemainingCells = srcTrimmedTineLength - srcCol;
+ const destRemainingCells = newCols - destCol;
+ const cellsToCopy = Math.min(srcRemainingCells, destRemainingCells);
+
+ wrappedLines[destLineIndex].copyCellsFrom(wrappedLines[srcLineIndex], srcCol, destCol, cellsToCopy, false);
+
+ destCol += cellsToCopy;
+ if (destCol === newCols) {
+ destLineIndex++;
+ destCol = 0;
+ }
+ srcCol += cellsToCopy;
+ if (srcCol === srcTrimmedTineLength) {
+ srcLineIndex++;
+ srcCol = 0;
+ }
+
+ // Make sure the last cell isn't wide, if it is copy it to the current dest
+ if (destCol === 0 && destLineIndex !== 0) {
+ if (wrappedLines[destLineIndex - 1].getWidth(newCols - 1) === 2) {
+ wrappedLines[destLineIndex].copyCellsFrom(wrappedLines[destLineIndex - 1], newCols - 1, destCol++, 1, false);
+ // Null out the end of the last row
+ wrappedLines[destLineIndex - 1].setCell(newCols - 1, nullCell);
+ }
+ }
+ }
+
+ // Clear out remaining cells or fragments could remain;
+ wrappedLines[destLineIndex].replaceCells(destCol, newCols, nullCell);
+
+ // Work backwards and remove any rows at the end that only contain null cells
+ let countToRemove = 0;
+ for (let i = wrappedLines.length - 1; i > 0; i--) {
+ if (i > destLineIndex || wrappedLines[i].getTrimmedLength() === 0) {
+ countToRemove++;
+ } else {
+ break;
+ }
+ }
+
+ if (countToRemove > 0) {
+ toRemove.push(y + wrappedLines.length - countToRemove); // index
+ toRemove.push(countToRemove);
+ }
+
+ y += wrappedLines.length - 1;
+ }
+ return toRemove;
+}
+
+/**
+ * Creates and return the new layout for lines given an array of indexes to be removed.
+ * @param lines The buffer lines.
+ * @param toRemove The indexes to remove.
+ */
+export function reflowLargerCreateNewLayout(lines: CircularList<IBufferLine>, toRemove: number[]): INewLayoutResult {
+ const layout: number[] = [];
+ // First iterate through the list and get the actual indexes to use for rows
+ let nextToRemoveIndex = 0;
+ let nextToRemoveStart = toRemove[nextToRemoveIndex];
+ let countRemovedSoFar = 0;
+ for (let i = 0; i < lines.length; i++) {
+ if (nextToRemoveStart === i) {
+ const countToRemove = toRemove[++nextToRemoveIndex];
+
+ // Tell markers that there was a deletion
+ lines.onDeleteEmitter.fire({
+ index: i - countRemovedSoFar,
+ amount: countToRemove
+ });
+
+ i += countToRemove - 1;
+ countRemovedSoFar += countToRemove;
+ nextToRemoveStart = toRemove[++nextToRemoveIndex];
+ } else {
+ layout.push(i);
+ }
+ }
+ return {
+ layout,
+ countRemoved: countRemovedSoFar
+ };
+}
+
+/**
+ * Applies a new layout to the buffer. This essentially does the same as many splice calls but it's
+ * done all at once in a single iteration through the list since splice is very expensive.
+ * @param lines The buffer lines.
+ * @param newLayout The new layout to apply.
+ */
+export function reflowLargerApplyNewLayout(lines: CircularList<IBufferLine>, newLayout: number[]): void {
+ // Record original lines so they don't get overridden when we rearrange the list
+ const newLayoutLines: BufferLine[] = [];
+ for (let i = 0; i < newLayout.length; i++) {
+ newLayoutLines.push(lines.get(newLayout[i]) as BufferLine);
+ }
+
+ // Rearrange the list
+ for (let i = 0; i < newLayoutLines.length; i++) {
+ lines.set(i, newLayoutLines[i]);
+ }
+ lines.length = newLayout.length;
+}
+
+/**
+ * Gets the new line lengths for a given wrapped line. The purpose of this function it to pre-
+ * compute the wrapping points since wide characters may need to be wrapped onto the following line.
+ * This function will return an array of numbers of where each line wraps to, the resulting array
+ * will only contain the values `newCols` (when the line does not end with a wide character) and
+ * `newCols - 1` (when the line does end with a wide character), except for the last value which
+ * will contain the remaining items to fill the line.
+ *
+ * Calling this with a `newCols` value of `1` will lock up.
+ *
+ * @param wrappedLines The wrapped lines to evaluate.
+ * @param oldCols The columns before resize.
+ * @param newCols The columns after resize.
+ */
+export function reflowSmallerGetNewLineLengths(wrappedLines: BufferLine[], oldCols: number, newCols: number): number[] {
+ const newLineLengths: number[] = [];
+ const cellsNeeded = wrappedLines.map((l, i) => getWrappedLineTrimmedLength(wrappedLines, i, oldCols)).reduce((p, c) => p + c);
+
+ // Use srcCol and srcLine to find the new wrapping point, use that to get the cellsAvailable and
+ // linesNeeded
+ let srcCol = 0;
+ let srcLine = 0;
+ let cellsAvailable = 0;
+ while (cellsAvailable < cellsNeeded) {
+ if (cellsNeeded - cellsAvailable < newCols) {
+ // Add the final line and exit the loop
+ newLineLengths.push(cellsNeeded - cellsAvailable);
+ break;
+ }
+ srcCol += newCols;
+ const oldTrimmedLength = getWrappedLineTrimmedLength(wrappedLines, srcLine, oldCols);
+ if (srcCol > oldTrimmedLength) {
+ srcCol -= oldTrimmedLength;
+ srcLine++;
+ }
+ const endsWithWide = wrappedLines[srcLine].getWidth(srcCol - 1) === 2;
+ if (endsWithWide) {
+ srcCol--;
+ }
+ const lineLength = endsWithWide ? newCols - 1 : newCols;
+ newLineLengths.push(lineLength);
+ cellsAvailable += lineLength;
+ }
+
+ return newLineLengths;
+}
+
+export function getWrappedLineTrimmedLength(lines: BufferLine[], i: number, cols: number): number {
+ // If this is the last row in the wrapped line, get the actual trimmed length
+ if (i === lines.length - 1) {
+ return lines[i].getTrimmedLength();
+ }
+ // Detect whether the following line starts with a wide character and the end of the current line
+ // is null, if so then we can be pretty sure the null character should be excluded from the line
+ // length]
+ const endsInNull = !(lines[i].hasContent(cols - 1)) && lines[i].getWidth(cols - 1) === 1;
+ const followingLineStartsWithWide = lines[i + 1].getWidth(0) === 2;
+ if (endsInNull && followingLineStartsWithWide) {
+ return cols - 1;
+ }
+ return cols;
+}
projects / VSoRC / .git / blobdiff