1 files changed, 56 insertions, 0 deletions
diff --git a/misctools/gen-unicode-table.js b/misctools/gen-unicode-table.js
index 6ee02f5e8..cd46ac31c 100644
--- a/misctools/gen-unicode-table.js
+++ b/misctools/gen-unicode-table.js
@@ -117,6 +117,52 @@ function generateRangeTable(codePoints) {
   return lines.join("\n");
 }
 
+function generateBigSwitchStatement(codePoints) {
+  let lines = [];
+  let index = 0;
+  let latinOffset = 0;
+
+  while (latinOffset < codePoints.length && codePoints[latinOffset] <= 0xff) {
+    latinOffset++;
+  }
+
+  lines.push(`return switch(codepoint) {`);
+
+  // 16-bit code points
+  while (index < codePoints.length && codePoints[index] < 0x1000) {
+    let start = codePoints[index];
+    index++;
+    while (
+      index < codePoints.length &&
+      codePoints[index] < 0x1000 &&
+      codePoints[index] === codePoints[index - 1] + 1
+    ) {
+      index++;
+    }
+    let end = codePoints[index - 1];
+    lines.push(`0x${start.toString(16)}...0x${end.toString(16)},`);
+  }
+
+  // 32-bit code points
+  while (index < codePoints.length) {
+    let start = codePoints[index];
+    index++;
+    while (
+      index < codePoints.length &&
+      codePoints[index] === codePoints[index - 1] + 1
+    ) {
+      index++;
+    }
+    let end = codePoints[index - 1];
+    lines.push(` 0x${start.toString(16)}...0x${end.toString(16)},`);
+  }
+
+  lines.push(` => true, 
+    else => false  
+};`);
+  return lines.join("\n");
+}
+
 fs.writeFileSync(
   path.join(__dirname, "..", "src", "js_lexer", "unicode.zig"),
   `// This file was automatically generated by ${path.basename(
@@ -134,5 +180,15 @@ pub const id_continue = ${generateRangeTable(idContinueES5OrESNext)}
 
 pub const printable_id_start = ${generateRangeTable(idStartESNext)}
 pub const printable_id_continue = ${generateRangeTable(idContinueESNext)}
+
+pub fn isIdentifierStart(comptime Codepoint: type, codepoint: Codepoint) bool{
+  ${generateBigSwitchStatement(idStartES5OrESNext)}
+}
+
+pub fn isIdentifierContinue(comptime Codepoint: type, codepoint: Codepoint) bool{
+  ${generateBigSwitchStatement(idContinueES5OrESNext)}
+}
+
+
 `
 );