feat: add syntax highlighting in the REPL

PR-URL: #2254
Resolves: #2072

---------

Signed-off-by: Snehil Shah <[email protected]>
Reviewed-by: Athan Reines <[email protected]> 
Reviewed-by: Philipp Burckhardt <[email protected]>

Author: Snehil-Shah

lib/node_modules/@stdlib/repl/lib/ansi_colors.js

@@ -0,0 +1,58 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MAIN //
+
+/**
+* Table mapping generic color names to their ANSI color codes.
+*
+* @private
+* @name ANSI
+* @type {Object}
+*/
+var ANSI = {
+	// Original colors:
+	'black': '\u001b[30m',
+	'red': '\u001b[31m',
+	'green': '\u001b[32m',
+	'yellow': '\u001b[33m',
+	'blue': '\u001b[34m',
+	'magenta': '\u001b[35m',
+	'cyan': '\u001b[36m',
+	'white': '\u001b[37m',
+
+	// Bright colors:
+	'brightBlack': '\u001b[90m',
+	'brightRed': '\u001b[91m',
+	'brightGreen': '\u001b[92m',
+	'brightYellow': '\u001b[93m',
+	'brightBlue': '\u001b[94m',
+	'brightMagenta': '\u001b[95m',
+	'brightCyan': '\u001b[96m',
+	'brightWhite': '\u001b[97m',
+
+	// Reset colors:
+	'reset': '\u001b[0m'
+};
+
+
+// EXPORTS //
+
+module.exports = ANSI;

lib/node_modules/@stdlib/repl/lib/complete_expression.js

@@ -74,7 +74,7 @@ function complete( out, context, expression ) {
 	ast = parse( expression, AOPTS );
 
 	debug( 'Resolving local scopes within the AST.' );
-	ast = resolveLocalScopes( ast );
+	resolveLocalScopes( ast );
 
 	// Get the last program top-level AST "node":
 	debug( 'Number of statements: %d', ast.body.length );

lib/node_modules/@stdlib/repl/lib/main.js

@@ -63,6 +63,7 @@ var processLine = require( './process_line.js' );
 var completerFactory = require( './completer.js' );
 var PreviewCompleter = require( './completer_preview.js' );
 var AutoCloser = require( './auto_close_pairs.js' );
+var SyntaxHighlighter = require( './syntax_highlighter.js' );
 var ALIAS_OVERRIDES = require( './alias_overrides.js' );
 var SETTINGS = require( './settings.js' );
 var SETTINGS_VALIDATORS = require( './settings_validators.js' );
@@ -270,6 +271,9 @@ function REPL( options ) {
 	// Initialize a preview completer:
 	setNonEnumerableReadOnly( this, '_previewCompleter', new PreviewCompleter( this._rli, this._completer, this._ostream, this._settings.completionPreviews ) );
 
+	// Initialize a syntax-highlighter:
+	setNonEnumerableReadOnly( this, '_syntaxHighlighter', new SyntaxHighlighter( this, this._ostream ) );
+
 	// Cache a reference to the private readline interface `ttyWrite` to allow calling the method when wanting default behavior:
 	setNonEnumerableReadOnly( this, '_ttyWrite', this._rli._ttyWrite );
 
@@ -334,6 +338,7 @@ function REPL( options ) {
 	*/
 	function onKeypress( data, key ) {
 		var autoClosed;
+
 		if ( key && key.name === 'tab' ) {
 			return;
 		}
@@ -343,6 +348,9 @@ function REPL( options ) {
 		if ( autoClosed ) {
 			self._previewCompleter.clear();
 		}
+		if ( self._isTTY ) {
+			self._syntaxHighlighter.onKeypress();
+		}
 		self._previewCompleter.onKeypress( data, key );
 	}
 

lib/node_modules/@stdlib/repl/lib/resolve_globals.js

@@ -76,7 +76,7 @@ function resolveGlobals( ast ) {
 	globals = [];
 
 	// Resolve local scopes:
-	ast = resolveLocalScopes( ast );
+	resolveLocalScopes( ast );
 
 	// Define callbacks for relevant AST nodes:
 	visitors = {