feat: support [Exposed=*] (#634)

* reformat webpack config

* feat: support `[Exposed=*]`

* fix writer

Author: saschanaz

README.md

@@ -726,6 +726,7 @@ Extended attributes look like this:
    * `"decimal-list"`
    * `"integer"`
    * `"integer-list"`
+   * `"*"`
 * `parent`: The container of this type as an Object.
 
 ### Default and Const Values

lib/productions/extended-attributes.js

@@ -57,7 +57,12 @@ class ExtendedAttributeParameters extends Base {
     const ret = autoParenter(
       new ExtendedAttributeParameters({ source: tokeniser.source, tokens })
     );
+    ret.list = [];
     if (tokens.assign) {
+      tokens.asterisk = tokeniser.consume("*");
+      if (tokens.asterisk) {
+        return ret.this;
+      }
       tokens.secondaryName = tokeniser.consumeKind(...extAttrValueSyntax);
     }
     tokens.open = tokeniser.consume("(");
@@ -77,13 +82,18 @@ class ExtendedAttributeParameters extends Base {
   }
 
   get rhsIsList() {
-    return this.tokens.assign && !this.tokens.secondaryName;
+    return (
+      this.tokens.assign && !this.tokens.asterisk && !this.tokens.secondaryName
+    );
   }
 
   get rhsType() {
     if (this.rhsIsList) {
       return this.list[0].tokens.value.type + "-list";
     }
+    if (this.tokens.asterisk) {
+      return "*";
+    }
     if (this.tokens.secondaryName) {
       return this.tokens.secondaryName.type;
     }
@@ -95,15 +105,14 @@ class ExtendedAttributeParameters extends Base {
     const { rhsType } = this;
     return w.ts.wrap([
       w.token(this.tokens.assign),
+      w.token(this.tokens.asterisk),
       w.reference_token(this.tokens.secondaryName, this.parent),
       w.token(this.tokens.open),
-      ...(!this.list
-        ? []
-        : this.list.map((p) => {
-            return rhsType === "identifier-list"
-              ? w.identifier(p, this.parent)
-              : p.write(w);
-          })),
+      ...this.list.map((p) => {
+        return rhsType === "identifier-list"
+          ? w.identifier(p, this.parent)
+          : p.write(w);
+      }),
       w.token(this.tokens.close),
     ]);
   }
@@ -143,7 +152,9 @@ export class SimpleExtendedAttribute extends Base {
     }
     const value = this.params.rhsIsList
       ? list
-      : unescape(tokens.secondaryName.value);
+      : this.params.tokens.secondaryName
+      ? unescape(tokens.secondaryName.value)
+      : null;
     return { type, value };
   }
   get arguments() {

lib/tokeniser.js

@@ -103,6 +103,7 @@ const punctuations = [
   "=",
   ">",
   "?",
+  "*",
   "[",
   "]",
   "{",

test/syntax/baseline/exposed-asterisk.json

@@ -0,0 +1,24 @@
+[
+    {
+        "type": "interface",
+        "name": "X",
+        "inheritance": null,
+        "members": [],
+        "extAttrs": [
+            {
+                "type": "extended-attribute",
+                "name": "Exposed",
+                "rhs": {
+                    "type": "*",
+                    "value": null
+                },
+                "arguments": []
+            }
+        ],
+        "partial": false
+    },
+    {
+        "type": "eof",
+        "value": ""
+    }
+]

test/syntax/idl/exposed-asterisk.webidl

@@ -0,0 +1,2 @@
+[Exposed=*]
+interface X {};

webpack.config.cjs

@@ -1,13 +1,13 @@
 const path = require("path");
-const TerserPlugin = require('terser-webpack-plugin');
+const TerserPlugin = require("terser-webpack-plugin");
 module.exports = {
   entry: "./index.js",
   output: {
     filename: "webidl2.js",
     path: path.resolve(__dirname, "dist"),
     library: "WebIDL2",
     libraryTarget: "umd",
-    globalObject: "globalThis"
+    globalObject: "globalThis",
   },
   mode: "production",
   devtool: "source-map",
@@ -16,9 +16,9 @@ module.exports = {
       new TerserPlugin({
         terserOptions: {
           keep_classnames: true,
-          sourceMap: true
-        }
-      })
-    ]
-  }
+          sourceMap: true,
+        },
+      }),
+    ],
+  },
 };