fix: remove stray punctuation from malformed To HTML Entity table values (#2660)

src/core/operations/ToHTMLEntity.mjs

@@ -405,7 +405,7 @@ const byteToEntity = {
     989: "ϝ",
     1008: "ϰ",
     1009: "ϱ",
-    1013: "ε,",
+    1013: "ε",
     1014: "϶",
     1025: "Ё",
     1026: "Ђ",
@@ -660,7 +660,7 @@ const byteToEntity = {
     8649: "⇉",
     8650: "⇊",
     8651: "⇋",
-    8652: "⇌;",
+    8652: "⇌",
     8653: "⇍",
     8654: "⇎",
     8655: "⇏",
@@ -782,7 +782,7 @@ const byteToEntity = {
     8814: "≮",
     8815: "≯",
     8816: "≰",
-    8817: "≱;",
+    8817: "≱",
     8818: "≲",
     8819: "≳",
     8820: "≴",

tests/node/index.mjs

@@ -24,6 +24,7 @@ import "./tests/Dish.mjs";
 import "./tests/NodeDish.mjs";
 import "./tests/Utils.mjs";
 import "./tests/Categories.mjs";
+import "./tests/ToHTMLEntity.mjs";
 import "./tests/lib/BigIntUtils.mjs";
 import "./tests/lib/ChartsProtocolPrototypePollution.mjs";
 

tests/node/tests/ToHTMLEntity.mjs

@@ -0,0 +1,33 @@
+import TestRegister from "../../lib/TestRegister.mjs";
+import ToHTMLEntity from "../../../src/core/operations/ToHTMLEntity.mjs";
+import it from "../assertionHandler.mjs";
+import assert from "assert";
+
+TestRegister.addApiTests([
+    it("To HTML Entity: every named entity in the table is well-formed", () => {
+        // "Convert all characters" emits an entity for every code point, so a
+        // correct table yields an unbroken stream of entity tokens. A malformed
+        // value such as "≱;" or "ε," leaves stray characters between
+        // tokens, which the walk below flags and reports with surrounding context.
+        let input = "";
+        for (let cp = 0; cp <= 0xFFFF; cp++) {
+            if (cp >= 0xD800 && cp <= 0xDFFF) continue; // skip surrogate range
+            input += String.fromCodePoint(cp);
+        }
+        const output = new ToHTMLEntity().run(input, [true, "Named entities"]);
+
+        const tokenRe = /&#[0-9]+;|&#x[0-9a-fA-F]+;|&[A-Za-z][A-Za-z0-9]*;/y;
+        const malformed = [];
+        let pos = 0;
+        while (pos < output.length) {
+            tokenRe.lastIndex = pos;
+            if (tokenRe.exec(output)) {
+                pos = tokenRe.lastIndex;
+            } else {
+                malformed.push(output.slice(Math.max(0, pos - 12), pos + 12));
+                pos++;
+            }
+        }
+        assert.deepStrictEqual(malformed, [], `Malformed entity value(s) near: ${JSON.stringify(malformed)}`);
+    }),
+]);