Handle more "number" digits

src/test.cpp

@@ -192,14 +192,21 @@ constexpr static struct Tables {
     whitespace['\n'] = true;
     whitespace['\r'] = true;
     whitespace['\t'] = true;
+    for (int i = 0; i < 10; ++i) {
+      number['0' + i] = true;
+    }
+    number['.'] = true;
+    number['+'] = true;
+    number['-'] = true;
   }
   alignas(16) bool whitespace[256]{};
+  alignas(16) bool number[256]{};
 } tables;
 
 namespace {
 
 // Straightforward recursive descent that doesn't handle string escaping and
-// treats numbers as [0-9.]+. May stack overflow on deeply nested json documents
+// all numbers. May stack overflow on deeply nested json documents
 struct Parser1 {
   Parser1(char *buf, int len, const Callbacks *callbacks, void *data)
       : buf(buf), bufEnd(buf + len), callbacks(callbacks), data(data) {}
@@ -396,7 +403,7 @@ private:
       if (len() == 0) {
         return false;
       }
-      if ('0' <= *buf && *buf <= '9' || (*buf == '.')) {
+      if (tables.number[*buf]) {
         ++buf;
       } else {
         break;
@@ -445,8 +452,8 @@ private:
 #define MUSTTAIL
 #endif
 
-// Table-based ll(1) parser that doesn't handle escaping and treats numbers as
+// Table-based ll(1) parser that doesn't handle escaping and all numbers, with a
-// [0-9.]+. Could be adapted to have a streaming interface. Uses O(1) memory.
+// streaming interface. Uses O(1) memory.
 struct Parser2 {
   Parser2(const Callbacks *callbacks, void *data)
       : callbacks(callbacks), data(data) {
@@ -488,7 +495,7 @@ private:
   Status parse_number() {
     char *const bufBefore = buf;
     while (len() > 0) {
-      if ('0' <= *buf && *buf <= '9' || (*buf == '.')) {
+      if (tables.number[*buf]) {
         ++buf;
       } else {
         break;