align concurrent signal assignment

VHDLFormatter.js

@@ -656,11 +656,27 @@ function beautifySemicolonBlock(inputs, result, settings, startIndex, parentEndI
     [endIndex, parentEndIndex] = getSemicolonBlockEndIndex(inputs, settings, startIndex, parentEndIndex);
     result.push(new FormattedLine(inputs[startIndex], indent));
     if (endIndex != startIndex) {
-        let i = beautify3(inputs, result, settings, startIndex + 1, indent + 1, endIndex);
+        beautify3(inputs, result, settings, startIndex + 1, indent + 1, endIndex);
+        alignSignalAssignmentBlock(settings, inputs, startIndex, endIndex, result);
     }
     return [endIndex, parentEndIndex];
 }
 exports.beautifySemicolonBlock = beautifySemicolonBlock;
+function alignSignalAssignmentBlock(settings, inputs, startIndex, endIndex, result) {
+    if (settings.Indentation.replace(/ +/g, "").length == 0) {
+        let reg = new RegExp("^([\\w\\\\]+[\\s]*<=\\s*)");
+        let match = reg.exec(inputs[startIndex]);
+        if (match != null) {
+            let length = match[0].length;
+            let prefixLength = length - settings.Indentation.length;
+            let prefix = new Array(prefixLength + 1).join(" ");
+            for (let i = startIndex + 1; i <= endIndex; i++) {
+                let fl = result[i];
+                fl.Line = prefix + fl.Line;
+            }
+        }
+    }
+}
 function beautify3(inputs, result, settings, startIndex, indent, endIndex) {
     let i;
     let regexOneLineBlockKeyWords = new RegExp(/(PROCEDURE)[^\w](?!.+[^\w]IS([^\w]|$))/); //match PROCEDURE..; but not PROCEDURE .. IS;

VHDLFormatter.ts

@@ -725,12 +725,29 @@ export function beautifySemicolonBlock(inputs: Array<string>, result: (Formatted
     [endIndex, parentEndIndex] = getSemicolonBlockEndIndex(inputs, settings, startIndex, parentEndIndex);
     result.push(new FormattedLine(inputs[startIndex], indent));
     if (endIndex != startIndex) {
-        let i = beautify3(inputs, result, settings, startIndex + 1, indent + 1, endIndex);
+        beautify3(inputs, result, settings, startIndex + 1, indent + 1, endIndex);
+        alignSignalAssignmentBlock(settings, inputs, startIndex, endIndex, result);
     }
 
     return [endIndex, parentEndIndex];
 }
 
+function alignSignalAssignmentBlock(settings: BeautifierSettings, inputs: string[], startIndex: number, endIndex: number, result: (FormattedLine | FormattedLine[])[]) {
+    if (settings.Indentation.replace(/ +/g, "").length == 0) {
+        let reg: RegExp = new RegExp("^([\\w\\\\]+[\\s]*<=\\s*)");
+        let match = reg.exec(inputs[startIndex]);
+        if (match != null) {
+            let length = match[0].length;
+            let prefixLength = length - settings.Indentation.length;
+            let prefix = new Array(prefixLength + 1).join(" ");
+            for (let i = startIndex + 1; i <= endIndex; i++) {
+                let fl = (result[i] as FormattedLine);
+                fl.Line = prefix + fl.Line;
+            }
+        }
+    }
+}
+
 export function beautify3(inputs: Array<string>, result: (FormattedLine | FormattedLine[])[], settings: BeautifierSettings, startIndex: number, indent: number, endIndex?: number): number {
     let i: number;
     let regexOneLineBlockKeyWords: RegExp = new RegExp(/(PROCEDURE)[^\w](?!.+[^\w]IS([^\w]|$))/);//match PROCEDURE..; but not PROCEDURE .. IS;

tests/VHDLFormatter.test.ts

@@ -95,6 +95,13 @@ describe('VHDLFormatter', function () {
         let result = beautify(input, setting);
         expect(result).toBe(expected);
     });
+    
+    it('semicolon blocks are aligned', function () {
+        let settings = GetDefaultSettings();
+        let input = 'OUT <= In0 AFTER 2ns WHEN "00",\r\n       In1 AFTER 2ns WHEN "01",\r\n       In2 AFTER 2ns WHEN "10",\r\n       In3 AFTER 2ns WHEN "11";';
+        let result = beautify(input, settings);
+        expect(result).toBe(input);
+    });
 });
 
 function GetDefaultSettings(indentation: string = "    "): BeautifierSettings {