From 16d8ed866ee82c16632e75ab2c838c815613e1ba Mon Sep 17 00:00:00 2001
From: Ekaterina Mulyukina <am@jetlend.ru>
Date: Sat, 26 Oct 2024 14:26:56 +0300
Subject: [PATCH] Add support for Svelte V4

---
 README.md                                  |  6 +++---
 index.js                                   |  2 +-
 lib/detector.js                            | 10 ++++++----
 test/integration/detector/detector.spec.js |  3 ++-
 4 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index b0b3ae9..2876efa 100644
--- a/README.md
+++ b/README.md
@@ -127,7 +127,7 @@ npm install --save sveltedoc-parser
 - Extract component actions
 - Extract component transitions
 
-### Svelte 3
+### Svelte 3/4
 
 - Extract global component description and keywords from JSDoc comment
   - Top level comment must include `@component`. [Example script](/test/svelte3/integration/globalComment/globalComment.script.svelte), [Example html](/test/svelte3/integration/globalComment/globalComment.markup.svelte)
@@ -149,14 +149,14 @@ Here are the properties supported by `options` (see the [Usage](#Usage) section
 | **features** | The component features to parse and extract. | string[] | [All supported features](#Supported-feature-names) |
 | **ignoredVisibilities** | The list of ignored visibilities. Symbols with a visibility that is ignored will not be included in the output. | string[] | `['private', 'protected']` |
 | **includeSourceLocations** | Flag, which indicates that source locations should be provided for component symbols. | boolean | `false` |
-| **version** | Optional. Use `2` (will deprecating) or `3` to specify which svelte syntax should be used. When that is not provided, parser try to detect version of the syntax. | number? | `undefined` |
+| **version** | Optional. Use `2` (will deprecating), `3` or `4` to specify which svelte syntax should be used. When that is not provided, parser try to detect version of the syntax. | number? | `undefined` |
 | **defaultVersion** | Optional. Specify default version of svelte syntax, if auto-detector can't identify correct version. | number? | `undefined` |
 
 ### Supported feature names
 
 These are the values that can be included in the `options.features` array:
 
-| Feature       | Svelte 2 | Svelte 3 | Description                                           |
+| Feature       | Svelte 2 | Svelte 3/4 | Description                                           |
 |---------------|:--------:|:--------:|-------------------------------------------------------|
 | `name`        |     ✔    |     ✔    | Component's name                                      |
 | `description` |     ✔    |     ✔    | Component's description                               |
diff --git a/index.js b/index.js
index 120fd11..39d2951 100644
--- a/index.js
+++ b/index.js
@@ -34,7 +34,7 @@ function buildSvelte3Parser(options) {
 }
 
 function buildSvelteParser(options, version) {
-    if (version === SvelteVersionDetector.SVELTE_VERSION_3) {
+    if (version === SvelteVersionDetector.SVELTE_VERSION_3 || version === SvelteVersionDetector.SVELTE_VERSION_4) {
         return buildSvelte3Parser(options);
     }
 
diff --git a/lib/detector.js b/lib/detector.js
index 7147bb2..4e3ea70 100644
--- a/lib/detector.js
+++ b/lib/detector.js
@@ -2,6 +2,7 @@ const { loadFileStructureFromOptions: loadFileContentFromOptions } = require('./
 
 const SVELTE_VERSION_2 = 2;
 const SVELTE_VERSION_3 = 3;
+const SVELTE_VERSION_4 = 4;
 
 function isElseIfWithoutSpaceInTemplate(template) {
     return /\{:elseif\s/gi.test(template);
@@ -47,24 +48,24 @@ function detectVersionFromStructure(structure, defaultVersion) {
 
         // The `{:else if ...}` statement is valid for Svelte 3
         if (isElseIfWithSpaceInTemplate(structure.template)) {
-            return SVELTE_VERSION_3;
+            return SVELTE_VERSION_4;
         }
 
         // The `let:item=...` syntax is valid for Svelte 3
         if (isLetUsedForSlotInTemplate(structure.template)) {
-            return SVELTE_VERSION_3;
+            return SVELTE_VERSION_4;
         }
     }
 
     if (structure.scripts) {
         // In Svelte 3 is possible to use more than one script blocks
         if (structure.scripts.length > 1) {
-            return SVELTE_VERSION_3;
+            return SVELTE_VERSION_4;
         }
 
         // In Svelte 3 is possible to define context attribute for script blocks
         if (structure.scripts.some(scriptBlock => isContextUsedForScriptBlock(scriptBlock))) {
-            return SVELTE_VERSION_3;
+            return SVELTE_VERSION_4;
         }
 
         // Export default statement can be used only in Svelte 2
@@ -85,6 +86,7 @@ function detectVersionFromStructure(structure, defaultVersion) {
 module.exports = {
     SVELTE_VERSION_2,
     SVELTE_VERSION_3,
+    SVELTE_VERSION_4,
     detectVersionFromOptions,
     detectVersionFromStructure
 };
diff --git a/test/integration/detector/detector.spec.js b/test/integration/detector/detector.spec.js
index eea2e2a..93bafd0 100644
--- a/test/integration/detector/detector.spec.js
+++ b/test/integration/detector/detector.spec.js
@@ -43,7 +43,8 @@ describe('SvelteDoc file version detector', () => {
                         filename: path.join(folderPath, file)
                     });
 
-                    expect(version).is.equal(detector.SVELTE_VERSION_3);
+                    // Difference between V3 and V4 is not mach in code, so we can detect it as V4
+                    expect(version).is.equal(detector.SVELTE_VERSION_4);
                 });
             });
     });