Small perf improvements

.github/workflows/benchmark.yml

@@ -0,0 +1,42 @@
+name: Performance Benchmarks
+
+on:
+  # Run on pushes to main branches and feature branches with 'perf' in name
+  push:
+    branches: [ master, 'feature/*perf*' ]
+
+  # Allow manual triggering
+  workflow_dispatch:
+    inputs:
+      reason:
+        description: 'Reason for running benchmark'
+        required: false
+        default: 'Manual benchmark run'
+
+  # Run on release
+  release:
+    types: [published]
+
+jobs:
+  benchmark:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Use Node.js LTS
+      uses: actions/setup-node@v4
+      with:
+        node-version: 'lts/*'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run benchmark
+      run: |
+        echo "Starting benchmark run..."
+        if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+          echo "Reason: ${{ github.event.inputs.reason }}"
+        fi
+        xvfb-run -a npm run benchmark

.gitignore

@@ -1,4 +1,5 @@
 out
 node_modules
 .vscode-test
-*.vsix
+*.vsix
+benchmark-results-*.json

.vscode/launch.json

@@ -23,6 +23,19 @@
             ],
             "outFiles": [ "${workspaceRoot}/out/test/**/*.js" ],
             "preLaunchTask": "compileAndCopyTestResources"
+        },
+        {
+            "name": "Launch Benchmarks",
+            "type": "extensionHost",
+            "request": "launch",
+            "runtimeExecutable": "${execPath}",
+            "args": [
+                "--disable-extensions",
+                "--extensionDevelopmentPath=${workspaceRoot}", 
+                "--extensionTestsPath=${workspaceRoot}/out/test/systemTests/benchmarkRunner.js" 
+            ],
+            "outFiles": [ "${workspaceRoot}/out/test/**/*.js" ],
+            "preLaunchTask": "compileAndCopyTestResources"
         }
     ]
 }

README.md

@@ -5,6 +5,7 @@
 [![OVSX](https://img.shields.io/open-vsx/v/darkriszty/markdown-table-prettify?color=success&label=Open%20VSX)](https://open-vsx.org/extension/darkriszty/markdown-table-prettify)
 [![Docker image](https://img.shields.io/docker/v/darkriszty/prettify-md?color=success&label=Docker)](https://hub.docker.com/r/darkriszty/prettify-md/tags?page=1&ordering=last_updated)
 [![NPM package](https://img.shields.io/npm/v/markdown-table-prettify?color=success)](https://www.npmjs.com/package/markdown-table-prettify)
+[![Benchmarks](https://github.com/darkriszty/MarkdownTablePrettify-VSCodeExt/actions/workflows/benchmark.yml/badge.svg)](https://github.com/darkriszty/MarkdownTablePrettify-VSCodeExt/actions/workflows/benchmark.yml)
 
 Makes tables more readable for humans. Compatible with the Markdown writer plugin's table formatter feature in Atom.
 

package.json

@@ -78,6 +78,7 @@
     "compile": "tsc -p ./",
     "pretest": "npm run compile",
     "test": "npx gulp copy-systemTest-resources && node ./out/test/index.js",
+    "benchmark": "npm run compile && npx gulp copy-systemTest-resources && node ./out/test/systemTests/benchmarkTestRunner.js",
     "prettify-md": "node ./out/cli/index.js",
     "check-md": "node ./out/cli/index.js --check"
   },

src/extension/extension.ts

@@ -1,11 +1,20 @@
 'use strict';
 import * as vscode from 'vscode';
-import { getSupportLanguageIds, getDocumentRangePrettyfier, getDocumentPrettyfier, getDocumentPrettyfierCommand } from './prettyfierFactory';
+import { getSupportLanguageIds, getDocumentRangePrettyfier, getDocumentPrettyfier, getDocumentPrettyfierCommand, invalidateCache } from './prettyfierFactory';
 
 // This method is called when the extension is activated.
 // The extension is activated the very first time the command is executed.
 export function activate(context: vscode.ExtensionContext): void {
 
+    // Invalidate cache when configuration changes
+    context.subscriptions.push(
+        vscode.workspace.onDidChangeConfiguration(event => {
+            if (event.affectsConfiguration("markdownTablePrettify")) {
+                invalidateCache();
+            }
+        })
+    );
+
     const supportedLanguageIds = getSupportLanguageIds();
     for (let language of supportedLanguageIds) {
         context.subscriptions.push(

src/extension/prettyfierFactory.ts

@@ -24,6 +24,12 @@ import { SingleTablePrettyfier } from '../prettyfiers/singleTablePrettyfier';
 import { TableStringWriter } from "../writers/tableStringWriter";
 import { ValuePaddingProvider } from '../writers/valuePaddingProvider';
 
+let cachedMultiTablePrettyfier: MultiTablePrettyfier | null = null;
+
+export function invalidateCache() {
+    cachedMultiTablePrettyfier = null;
+}
+
 export function getSupportLanguageIds() {
     return [ "markdown", ...getConfigurationValue<Array<string>>("extendedLanguages", []) ];
 }
@@ -41,15 +47,21 @@ export function getDocumentPrettyfierCommand(): TableDocumentPrettyfierCommand {
 }
 
 function getMultiTablePrettyfier(): MultiTablePrettyfier {
+    if (cachedMultiTablePrettyfier) {
+        return cachedMultiTablePrettyfier;
+    }
+
     const loggers = getLoggers();
     const sizeLimitCheker = getSizeLimitChecker(loggers);
     const columnPadding: number = getConfigurationValue<number>("columnPadding", 0);
 
-    return new MultiTablePrettyfier(
+    cachedMultiTablePrettyfier = new MultiTablePrettyfier(
         new TableFinder(new TableValidator(new SelectionInterpreter(true))),
         getSingleTablePrettyfier(loggers, sizeLimitCheker, columnPadding),
         sizeLimitCheker
     );
+
+    return cachedMultiTablePrettyfier;
 }
 
 function getSingleTablePrettyfier(loggers: ILogger[], sizeLimitCheker: ConfigSizeLimitChecker, columnPadding: number): SingleTablePrettyfier {

src/padCalculation/padCalculatorSelector.ts

@@ -6,29 +6,41 @@ import * as CenterAlignment from "./center";
 import { Alignment } from "../models/alignment";
 
 export class PadCalculatorSelector {
-    public select(table: Table,  column: number) : BasePadCalculator {
+    private static readonly leftFirstColumn = new LeftAlignment.FirstColumnPadCalculator();
+    private static readonly leftMiddleColumn = new LeftAlignment.MiddleColumnPadCalculator();
+    private static readonly leftLastColumn = new LeftAlignment.LastColumnPadCalculator();
+
+    private static readonly centerFirstColumn = new CenterAlignment.FirstColumnPadCalculator();
+    private static readonly centerMiddleColumn = new CenterAlignment.MiddleColumnPadCalculator();
+    private static readonly centerLastColumn = new CenterAlignment.LastColumnPadCalculator();
+
+    private static readonly rightFirstColumn = new RightAlignment.FirstColumnPadCalculator();
+    private static readonly rightMiddleColumn = new RightAlignment.MiddleColumnPadCalculator();
+    private static readonly rightLastColumn = new RightAlignment.LastColumnPadCalculator();
+
+    public select(table: Table, column: number) : BasePadCalculator {
         switch (table.alignments[column]) {
             case Alignment.Center: return this.centerAlignmentPadCalculator(table, column);
             case Alignment.Right: return this.rightAlignmentPadCalculator(table, column);
             default: return this.leftAlignmentPadCalculator(table, column);
         }
     }
 
-    private leftAlignmentPadCalculator(table: Table,  column: number) : BasePadCalculator {
-        if (column == 0) return new LeftAlignment.FirstColumnPadCalculator();
-        if (column == table.columnCount - 1) return new LeftAlignment.LastColumnPadCalculator();
-        return new LeftAlignment.MiddleColumnPadCalculator();
+    private leftAlignmentPadCalculator(table: Table, column: number) : BasePadCalculator {
+        if (column == 0) return PadCalculatorSelector.leftFirstColumn;
+        if (column == table.columnCount - 1) return PadCalculatorSelector.leftLastColumn;
+        return PadCalculatorSelector.leftMiddleColumn;
     }
 
-    private centerAlignmentPadCalculator(table: Table,  column: number) : BasePadCalculator {
-        if (column == 0) return new CenterAlignment.FirstColumnPadCalculator();
-        if (column == table.columnCount - 1) return new CenterAlignment.LastColumnPadCalculator();
-        return new CenterAlignment.MiddleColumnPadCalculator();
+    private centerAlignmentPadCalculator(table: Table, column: number) : BasePadCalculator {
+        if (column == 0) return PadCalculatorSelector.centerFirstColumn;
+        if (column == table.columnCount - 1) return PadCalculatorSelector.centerLastColumn;
+        return PadCalculatorSelector.centerMiddleColumn;
     }
 
-    private rightAlignmentPadCalculator(table: Table,  column: number) : BasePadCalculator {
-        if (column == 0) return new RightAlignment.FirstColumnPadCalculator();
-        if (column == table.columnCount - 1) return new RightAlignment.LastColumnPadCalculator();
-        return new RightAlignment.MiddleColumnPadCalculator();
+    private rightAlignmentPadCalculator(table: Table, column: number) : BasePadCalculator {
+        if (column == 0) return PadCalculatorSelector.rightFirstColumn;
+        if (column == table.columnCount - 1) return PadCalculatorSelector.rightLastColumn;
+        return PadCalculatorSelector.rightMiddleColumn;
     }
 }

src/viewModelFactories/alignmentMarking/alignmentMarkerStrategy.ts

@@ -1,16 +1,25 @@
 import { Alignment } from "../../models/alignment";
 import { IAlignmentMarker, LeftAlignmentMarker, RightAlignmentMarker, CenterAlignmentMarker, NotSetAlignmentMarker } from ".";
 
-
 export class AlignmentMarkerStrategy {
-    constructor(private _markerChar: string) { }
+    private readonly _leftMarker: IAlignmentMarker;
+    private readonly _rightMarker: IAlignmentMarker;
+    private readonly _centerMarker: IAlignmentMarker;
+    private readonly _notSetMarker: IAlignmentMarker;
+
+    constructor(private _markerChar: string) {
+        this._leftMarker = new LeftAlignmentMarker(this._markerChar);
+        this._rightMarker = new RightAlignmentMarker(this._markerChar);
+        this._centerMarker = new CenterAlignmentMarker(this._markerChar);
+        this._notSetMarker = new NotSetAlignmentMarker();
+    }
 
     public markerFor(alignment: Alignment): IAlignmentMarker {
         switch (alignment) {
-            case Alignment.Left: return new LeftAlignmentMarker(this._markerChar);
-            case Alignment.Right: return new RightAlignmentMarker(this._markerChar);
-            case Alignment.Center: return new CenterAlignmentMarker(this._markerChar);
-            default: return new NotSetAlignmentMarker();
+            case Alignment.Left: return this._leftMarker;
+            case Alignment.Right: return this._rightMarker;
+            case Alignment.Center: return this._centerMarker;
+            default: return this._notSetMarker;
         }
     }
 }

src/writers/tableStringWriter.ts

@@ -14,36 +14,36 @@ export class TableStringWriter {
         if (table.rows == null) throw new Error("Table rows can't be null.");
         if (table.columnCount == 0) throw new Error("Table must have at least one column.");
 
-        let buffer = "";
-        buffer += this.writeRowViewModel(table.header, table, true);
-        buffer += this.writeRowViewModel(table.separator, table, table.rowCount > 0);
-        buffer += this.writeRows(table);
+        const buffer: string[] = [];
+        buffer.push(this.writeRowViewModel(table.header, table, true));
+        buffer.push(this.writeRowViewModel(table.separator, table, table.rowCount > 0));
+        buffer.push(this.writeRows(table));
 
-        return buffer;
+        return buffer.join('');
     }
 
     private writeRows(table: TableViewModel): string {
-        let buffer = "";
+        const buffer: string[] = [];
         for (let row = 0; row < table.rowCount; row++) {
-            buffer += this.writeRowViewModel(table.rows[row], table, row != table.rowCount - 1);
+            buffer.push(this.writeRowViewModel(table.rows[row], table, row != table.rowCount - 1));
         }
-        return buffer;
+        return buffer.join('');
     }
 
     private writeRowViewModel(row: RowViewModel, table: TableViewModel, addEndOfLine: boolean): string {
-        let buffer = "";
-        buffer += table.leftPad;
-        buffer += this.getLeftBorderIfNeeded(table);
+        const buffer: string[] = [];
+        buffer.push(table.leftPad);
+        buffer.push(this.getLeftBorderIfNeeded(table));
         for (let col = 0; col < table.columnCount; col++) {
-            buffer += this._valuePaddingProvider.getLeftPadding();
-            buffer += row.getValueAt(col);
-            buffer += this._valuePaddingProvider.getRightPadding(table, col);
-            buffer += this.getSeparatorIfNeeded(table, col);
+            buffer.push(this._valuePaddingProvider.getLeftPadding());
+            buffer.push(row.getValueAt(col));
+            buffer.push(this._valuePaddingProvider.getRightPadding(table, col));
+            buffer.push(this.getSeparatorIfNeeded(table, col));
         }
-        buffer += this.getRightBorderIfNeeded(table);
+        buffer.push(this.getRightBorderIfNeeded(table));
         if (addEndOfLine)
-            buffer += row.EOL;
-        return buffer;
+            buffer.push(row.EOL);
+        return buffer.join('');
     }
 
     private getSeparatorIfNeeded(table: TableViewModel, currentColumn: number): string {