feat: add pretty print support for known custom class instances

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

@@ -30,6 +30,9 @@
 var isBooleanArray = require( '@stdlib/assert/is-booleanarray' );
 var isComplex128Array = require( '@stdlib/assert/is-complex128array' );
 var isComplex64Array = require( '@stdlib/assert/is-complex64array' );
+var isInt64 = require( '@stdlib/assert/is-int64' );
+var isUint64 = require( '@stdlib/assert/is-uint64' );
+var isComplex = require( '@stdlib/assert/is-complex' );
 var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
 var join = require( '@stdlib/array/base/join' );
 var constructorName = require( '@stdlib/utils/constructor-name' );
@@ -118,6 +121,46 @@
 	return format( '%s(%d) [%s]', ctor, values.length, str );
 }
 
+/**
+* Converts an integer instance to an annotated string.
+*
+* @private
+* @param {(Uint64|Int64)} value - input value
+* @returns {string} output string
+*
+* @example
+* var Uint64 = require( '@stdlib/number/uint64/ctor' );
+*
+* var x = new Uint64( 1 );
+* // returns <Uint64>
+*
+* var str = integer2string( x );
+* // returns '[Uint64: 1n]'
+*/
+function integer2string( value ) {
+	return format( '[%s: %sn]', constructorName( value ), value.toString() );
+}
+
+/**
+* Converts a complex number instance to an annotated string.
+*
+* @private
+* @param {(Complex64|Complex128)} value - input value
+* @returns {string} output string
+*
+* @example
+* var Complex128 = require( '@stdlib/complex/float64/ctor' );
+*
+* var z = new Complex128( 1.0, 2.0 );
+* // returns <Complex128>
+*
+* var str = complex2string( z );
+* // returns '[Complex128: 1 + 2i]'
+*/
+function complex2string( value ) {
+	return format( '[%s: %s]', constructorName( value ), value.toString() );
+}
+
 
 // MAIN //
 
@@ -209,9 +252,9 @@
 	if ( code.silent === false && res !== void 0 ) {
 		pre = replace( repl._outputPrompt, '%d', (repl._count+1).toString() );
 
 		// TODO: pretty printing (can defer to `util.inspect` for now, but will invariably want more control over this later, possibly including default configuration, etc, either at startup, during runtime, or according to an external configuration file)
 		if ( isndarrayLike( res ) ) {
 			tmp = res.toString(); // FIXME: this is a hack in order to avoid printing private ndarray properties in the REPL, as done by the built-in `util.inspect`. Ideally, we'd roll our own inspector which specifically accommodates stdlib's ndarray and other specialized classes.
 		} else if (
 			isBooleanArray( res ) ||
 			isComplex128Array( res ) ||
@@ -219,8 +262,14 @@
 			isInt64Array( res ) ||
 			isUint64Array( res )
 		) {
 			// FIXME: this is a hack in order to avoid things like `BooleanArray {}` which doesn't allow easy inspection of array contents. Ideally, we'd roll our own inspector to accommodate stdlib's specialized array classes.
 			tmp = array2string( constructorName( res ), copy2primitives( res ) ); // eslint-disable-line max-len
+		} else if ( isInt64( res ) || isUint64( res ) ) {
+			// FIXME: this is a hack in order to avoid things like `Uint64 {}` which doesn't allow easy inspection of contents. Ideally, we'd roll our own inspector to accommodate stdlib's specialized scalar classes.
+			tmp = integer2string( res );
+		} else if ( isComplex( res ) ) {
+			// FIXME: this is a hack in order to avoid things like `Complex128 {}` which doesn't allow easy inspection of contents. Ideally, we'd roll our own inspector to accommodate stdlib's specialized scalar classes.
+			tmp = complex2string( res );
 		} else {
 			tmp = inspect( repl._ans );
 		}
@@ -286,7 +335,7 @@
 		if ( code.silent === false && ( res !== void 0 || results !== void 0 ) ) { // eslint-disable-line max-len
 			pre = replace( repl._outputPrompt, '%d', (repl._count+1).toString() );
 
 			// TODO: pretty printing (can defer to `util.inspect` for now, but will invariably want more control over this later, possibly including default configuration, etc, either at startup, during runtime, or according to an external configuration file)
 			repl._ostream.write( pre+inspect( repl._ans )+'\n' );
 		}
 		// Finish processing: