Simplify maybeSkipWs

src/test.cpp

@@ -160,24 +160,15 @@ const char *symbolNames[] = {
     "N_OBJECT_MAYBE_CONTINUE",
 };
 
-int leadingWhitespaceCount(const char *buf, int len) {
-  constexpr static struct Table {
-    constexpr Table() {
-      for (int i = 0; i < 256; ++i) {
-        notWhitespace[i] = !(i == ' ' || i == '\n' || i == '\t' || i == '\r');
+constexpr static struct Tables {
+  constexpr Tables() {
+    whitespace[' '] = true;
+    whitespace['\n'] = true;
+    whitespace['\r'] = true;
+    whitespace['\t'] = true;
   }
-    }
-    alignas(16) bool notWhitespace[256]{};
-  } table;
-
-  int i = 0;
-  for (; i < len; ++i) {
-    if (table.notWhitespace[buf[i]]) {
-      break;
-    }
-  }
-  return i;
-}
+  alignas(16) bool whitespace[256]{};
+} tables;
 
 namespace {
 
@@ -204,7 +195,11 @@ private:
   int len() const { return bufEnd - buf; }
 
   // Helpers
-  void maybeSkipWs() { buf += leadingWhitespaceCount(buf, len()); }
+  void maybeSkipWs() {
+    while (buf != bufEnd && tables.whitespace[*buf]) {
+      ++buf;
+    }
+  }
   bool parseLiteral(const char *literal) {
     const int litLen = strlen(literal);
     if (len() < litLen) {
@@ -440,7 +435,11 @@ struct Parser2 {
 
 private:
   // Helpers
-  void maybeSkipWs() { buf += leadingWhitespaceCount(buf, len()); }
+  void maybeSkipWs() {
+    while (buf != bufEnd && tables.whitespace[*buf]) {
+      ++buf;
+    }
+  }
   bool parseLiteral(const char *literal) {
     const int litLen = strlen(literal);
     if (len() < litLen) {