Switch to dfa for strings

src/tables.h

@@ -1,50 +1,12 @@
 #pragma once
 
 constexpr inline struct Tables {
-  enum StringByteMeaning {
-    INVALID,
-    NORMAL,
-    DUBQUOTE,
-    BACKSLASH,
-    TWO_BYTE_UTF8,
-    THREE_BYTE_UTF8,
-    FOUR_BYTE_UTF8,
-    CONTINUATION_BYTE,
-  };
 
   constexpr Tables() {
     whitespace[' '] = true;
     whitespace['\n'] = true;
     whitespace['\r'] = true;
     whitespace['\t'] = true;
-
-    for (int i = 0; i < 256; ++i) {
-      if ((i & 0b11000000) == 0b10000000) {
-        stringByteMeaning[i] = CONTINUATION_BYTE;
-      }
-      if ((i & 0b11100000) == 0b11000000) {
-        stringByteMeaning[i] = TWO_BYTE_UTF8;
-      }
-      if ((i & 0b11110000) == 0b11100000) {
-        stringByteMeaning[i] = THREE_BYTE_UTF8;
-      }
-      if ((i & 0b11111000) == 0b11110000) {
-        stringByteMeaning[i] = FOUR_BYTE_UTF8;
-      }
-    }
-
-    for (int i = 0x20; i < 128; ++i) {
-      stringByteMeaning[i] = NORMAL;
-    }
-    stringByteMeaning['"'] = DUBQUOTE;
-    stringByteMeaning['\\'] = BACKSLASH;
-
-    stringByteMeaning[0xc0] = INVALID;
-    stringByteMeaning[0xc1] = INVALID;
-    for (int i = 0xF5; i < 0x100; ++i) {
-      stringByteMeaning[i] = INVALID;
-    }
-
     unescape['n'] = '\n';
     unescape['r'] = '\r';
     unescape['t'] = '\t';
@@ -55,6 +17,5 @@ constexpr inline struct Tables {
     unescape['/'] = '/';
   }
   bool whitespace[256]{};
-  StringByteMeaning stringByteMeaning[256]{};
   char unescape[256]{};
 } tables;