added sample extension and added Iterable

.gitignore

@@ -106,3 +106,6 @@ out/
 
 # macOS
 .DS_Store
+
+# generated copy for the grammar test extension (see build.js)
+test-extension/qsharp.tmLanguage.json

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Test grammar (Extension Development Host)",
+      "type": "extensionHost",
+      "request": "launch",
+      "args": [
+        "--disable-extension=quantum.qsharp-lang-vscode",
+        "--extensionDevelopmentPath=${workspaceFolder}/test-extension",
+        "${workspaceFolder}/test-extension/sample.qs"
+      ]
+    }
+  ]
+}

build.js

@@ -31,6 +31,17 @@ function build() {
     );
 
     console.log("Built grammars/qsharp.tmLanguage and grammars/qsharp.tmLanguage.json");
+
+    // Keep a copy inside the test extension (gitignored) so its manifest can
+    // reference a grammar within its own folder — VS Code warns otherwise.
+    const testExtDir = path.join(__dirname, "test-extension");
+    if (fs.existsSync(testExtDir)) {
+        fs.writeFileSync(
+            path.join(testExtDir, "qsharp.tmLanguage.json"),
+            JSON.stringify(grammar, null, "\t") + "\n"
+        );
+        console.log("Refreshed test-extension/qsharp.tmLanguage.json");
+    }
 }
 
 build();

grammars/qsharp.tmLanguage

@@ -718,7 +718,7 @@
             <key>name</key>
             <string>support.type.constraint.qsharp</string>
             <key>match</key>
-            <string>\b(Eq|Add|Sub|Mul|Div|Mod|Signed|Ord|Show|Integral|Exp)\b</string>
+            <string>\b(Eq|Add|Sub|Mul|Div|Mod|Signed|Ord|Show|Integral|Iterable|Exp)\b</string>
           </dict>
           <dict>
             <key>name</key>

grammars/qsharp.tmLanguage.json

@@ -477,7 +477,7 @@
 				},
 				{
 					"name": "support.type.constraint.qsharp",
-					"match": "\\b(Eq|Add|Sub|Mul|Div|Mod|Signed|Ord|Show|Integral|Exp)\\b"
+					"match": "\\b(Eq|Add|Sub|Mul|Div|Mod|Signed|Ord|Show|Integral|Iterable|Exp)\\b"
 				},
 				{
 					"name": "punctuation.squarebracket.open.qsharp",

src/qsharp.tmLanguage.yml

@@ -259,7 +259,7 @@ repository:
       - name: keyword.operator.qsharp
         match: \+
       - name: support.type.constraint.qsharp
-        match: \b(Eq|Add|Sub|Mul|Div|Mod|Signed|Ord|Show|Integral|Exp)\b
+        match: \b(Eq|Add|Sub|Mul|Div|Mod|Signed|Ord|Show|Integral|Iterable|Exp)\b
       - name: punctuation.squarebracket.open.qsharp
         match: \[
       - name: punctuation.squarebracket.close.qsharp

test-extension/README.md

@@ -0,0 +1,38 @@
+# Grammar test extension
+
+A throwaway VS Code extension used to manually test the Q# TextMate grammar in a
+real editor, isolated from the QDK extension (no language server, so no semantic
+highlighting paints over the grammar).
+
+It contributes the `qsharp` language for `.qs` files. Its grammar
+(`qsharp.tmLanguage.json`) is generated into this folder by `npm run build`
+(gitignored) so the manifest can reference a file inside its own folder — VS Code
+warns about grammar paths that escape the extension directory.
+
+## Usage
+
+1. Build the grammar so `grammars/qsharp.tmLanguage.json` is current:
+
+   ```bash
+   npm run build
+   ```
+
+2. Open the **repository root** in VS Code and press **F5** (the
+   `Test grammar (Extension Development Host)` launch config). This opens an
+   Extension Development Host with the official QDK extension disabled and
+   [`sample.qs`](./sample.qs) loaded.
+
+3. Verify tokenization with **`Developer: Inspect Editor Tokens and Scopes`**
+   (Command Palette) — hover a token to see its `source.qsharp` scopes. This is
+   the authoritative check; colors are just the active theme's scope mapping.
+
+4. After editing `src/qsharp.tmLanguage.yml`, re-run `npm run build` and reload
+   the host window (`Cmd/Ctrl+R`) to pick up the new grammar.
+
+## Notes
+
+- The launch config disables `quantum.qsharp-lang-vscode` only inside the
+  development host — your normal editor is untouched.
+- If you prefer not to use F5, symlink this folder into your extensions dir
+  (`ln -s "$PWD/test-extension" ~/.vscode/extensions/qsharp-tmlanguage-test`),
+  disable the QDK extension, and reload.

test-extension/language-configuration.json

@@ -0,0 +1,22 @@
+{
+  "comments": {
+    "lineComment": "//"
+  },
+  "brackets": [
+    ["[", "]"],
+    ["(", ")"],
+    ["{", "}"]
+  ],
+  "autoClosingPairs": [
+    ["[", "]"],
+    ["(", ")"],
+    ["{", "}"],
+    { "open": "\"", "close": "\"", "notIn": ["string"] }
+  ],
+  "surroundingPairs": [
+    ["[", "]"],
+    ["(", ")"],
+    ["{", "}"],
+    ["\"", "\""]
+  ]
+}

test-extension/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "qsharp-tmlanguage-test-extension",
+  "displayName": "Q# TextMate grammar (dev)",
+  "description": "Loads the locally-built Q# grammar for manual testing in an Extension Development Host.",
+  "publisher": "local",
+  "version": "0.0.0",
+  "private": true,
+  "engines": {
+    "vscode": "^1.75.0"
+  },
+  "contributes": {
+    "languages": [
+      {
+        "id": "qsharp",
+        "aliases": ["Q#", "qsharp"],
+        "extensions": [".qs"],
+        "configuration": "./language-configuration.json"
+      }
+    ],
+    "grammars": [
+      {
+        "language": "qsharp",
+        "scopeName": "source.qsharp",
+        "path": "./qsharp.tmLanguage.json"
+      }
+    ]
+  }
+}

test-extension/sample.qs

@@ -0,0 +1,63 @@
+import Std.Diagnostics.*;
+import Std.Math.PI as Pi;
+
+/// A doc comment describing a struct.
+struct Complex { Re : Double, Im : Double }
+
+@EntryPoint()
+operation Main() : Result[] {
+    // literals: decimal, hex, binary, octal, BigInt, float, separators
+    let ints = [42, 0xFF, 0b1010, 0o52, 1_000];
+    let big = 42L;
+    let approx = 1.0e-3;
+
+    // qubit allocation (single + tuple), gates, measurement, reset
+    use qs = Qubit[3];
+    use (control, target) = (Qubit(), Qubit());
+    for i in 0..Length(qs) - 1 {
+        H(qs[i]);
+    }
+    Controlled X([control], target);
+    Rx(Pi() / 4.0, target);
+
+    // structs: construction, copy-and-update, field access
+    let c = new Complex { Re = 1.0, Im = 0.0 };
+    let c2 = new Complex { ...c, Im = 2.0 };
+    let magnitudeSquared = c2.Re * c2.Re + c2.Im * c2.Im;
+
+    // operators: comparison, bitwise, ternary, ranges
+    let flags = (5 &&& 3) ||| (1 <<< 2);
+    let sign = magnitudeSquared > 0.0 ? One | Zero;
+    let slice = ints[1..2];
+
+    // lambdas, partial application, string interpolation
+    let addOne = x -> x + 1;
+    let applyX = q => X(q);
+    Message($"c2 = {c2.Re} + {c2.Im}i, sign = {sign}");
+
+    // control flow: if / elif / else, within-apply, mutation without `set`
+    mutable counter = 0;
+    counter += 1;
+    if counter == 1 {
+        Message("one");
+    } elif counter == 2 {
+        Message("two");
+    } else {
+        Message("many");
+    }
+
+    within {
+        H(qs[0]);
+    } apply {
+        Z(qs[0]);
+    }
+
+    ResetAll(qs);
+    return MeasureEachZ(qs);
+}
+
+function Sum2<'T : Add>(a : 'T, b : 'T) : 'T {
+    a + b
+}
+
+export Main, Sum2, Complex;