Partial implementation of JSON5 numeric literal extensions. Use a switch()

statement in the parser for better performance.

FossilOrigin-Name: 78404dc37024cad5fe7eacf78ea85b56f08b129a1b9a046c3e1b11275068a485

4 files changed, 117 insertions, 52 deletions

diff --git a/manifest b/manifest
index 901405d91..aefd7ea12 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Improvement\sto\sthe\sway\sthe\sJSON\sperformance\smeasure\sscripts\swork\s→\skeep\sthe\ntest\sdatabase\sin\sthe\sdirectory\sof\sthe\stest,\snot\sin\sthe\ssource\stree.
-D 2023-04-26T15:58:08.228
+C Partial\simplementation\sof\sJSON5\snumeric\sliteral\sextensions.\s\sUse\sa\sswitch()\nstatement\sin\sthe\sparser\sfor\sbetter\sperformance.
+D 2023-04-26T17:30:28.870
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -592,7 +592,7 @@ F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
 F src/hwtime.h b638809e083b601b618df877b2e89cb87c2a47a01f4def10be4c4ebb54664ac7
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c a8de1db43335fc4946370a7a7e47d89975ad678ddb15078a150e993ba2fb37d4
-F src/json.c d0f9a0c630bdea3721e28b5ba2fce119c0e732ad48f6674a8f1644f2ec45ffb1
+F src/json.c a346dbe63628f8cb9c6bf6bbccb8fc81a49730db2311ec9b483d7fc3582da223
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c be5af440f3192c58681b5d43167dbca3ccbfce394d89faa22378a14264781136
 F src/main.c 09bc5191f75dc48fc4dfddda143cb864c0c3dbc3297eb9a9c8e01fea58ff847d
@@ -1254,7 +1254,7 @@ F test/json/json-generator.tcl 229bd293f1865f787c160886cadd282631721925cca2947aa
 F test/json/json-q1.txt 335a7c8ab291d354f33b7decc9559e99a2823d4142291c4be7aa339a631f3c2d
 F test/json/json-speed-check.sh 8b7babf530faa58bd59d6d362cec8e9036a68c5457ff46f3b1f1511d21af6737 x
 F test/json101.test de9c93169b84ac96fd5836c638a2ae1f00e4afbd4003c6b596692d7f05e1cd69
-F test/json102.test 327e77275f338c028faefa2da5164daf6b142a165e3015ff2a6e4251ddc6a0ac
+F test/json102.test 1f61f469d763ff26430dbee76bc75e0aa73084ca84f10e58744fdb899e56de3e
 F test/json103.test 53df87f83a4e5fa0c0a56eb29ff6c94055c6eb919f33316d62161a8880112dbe
 F test/json104.test a502dc01853aada95d721b3b275afbe2dc18fffdac1fea6e96fb20c13586bbb5
 F test/json105.test 11670a4387f4308ae0318cadcbd6a918ea7edcd19fbafde020720a073952675d
@@ -2063,8 +2063,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P d262c059455ebe0650a45a6c1c04d1baf9609c635df352732dd192426e1bdc39
-R 3eb29750520f57f10b6b50d11e64a15f
+P ac411dbdcbf0b9040fb5b7de173271f383a6aa303d57f22ebd200809a5b4a6d3
+R 0e63126100fc0a5fcfa419eb4dbeae91
 U drh
-Z f254fb62ebf6c065b09ee32328c8e984
+Z 7c56c83a7327e89fcacb5797373de3a9
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 288ecccb2..76ab21e90 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-ac411dbdcbf0b9040fb5b7de173271f383a6aa303d57f22ebd200809a5b4a6d3
\ No newline at end of file
+78404dc37024cad5fe7eacf78ea85b56f08b129a1b9a046c3e1b11275068a485
\ No newline at end of file
diff --git a/src/json.c b/src/json.c
index 58f89b1aa..63feff948 100644
--- a/src/json.c
+++ b/src/json.c
@@ -912,10 +912,9 @@ static int jsonParseValue(JsonParse *pParse, u32 i){
   int x;
   JsonNode *pNode;
   const char *z = pParse->zJson;
-  while( fast_isspace(z[i]) ){ i++; }
 json_parse_restart:
-  c = z[i];
-  if( c=='{' ){
+  switch( (u8)z[i] ){
+  case '{': {
     /* Parse object */
     iThis = jsonParseAddNode(pParse, JSON_OBJECT, 0, 0);
     if( iThis<0 ) return -1;
@@ -951,7 +950,8 @@ json_parse_restart:
     }
     pParse->aNode[iThis].n = pParse->nNode - (u32)iThis - 1;
     return j+1;
-  }else if( c=='[' ){
+  }
+  case '[': {
     /* Parse array */
     iThis = jsonParseAddNode(pParse, JSON_ARRAY, 0, 0);
     if( iThis<0 ) return -1;
@@ -977,7 +977,8 @@ json_parse_restart:
     }
     pParse->aNode[iThis].n = pParse->nNode - (u32)iThis - 1;
     return j+1;
-  }else if( c=='"' ){
+  }
+  case '"': {
     /* Parse string */
     u8 jnFlags = 0;
     j = i+1;
@@ -1004,32 +1005,61 @@ json_parse_restart:
     jsonParseAddNode(pParse, JSON_STRING, j+1-i, &z[i]);
     if( !pParse->oom ) pParse->aNode[pParse->nNode-1].jnFlags = jnFlags;
     return j+1;
-  }else if( c=='n'
-         && strncmp(z+i,"null",4)==0
-         && !sqlite3Isalnum(z[i+4]) ){
-    jsonParseAddNode(pParse, JSON_NULL, 0, 0);
-    return i+4;
-  }else if( c=='t'
-         && strncmp(z+i,"true",4)==0
-         && !sqlite3Isalnum(z[i+4]) ){
-    jsonParseAddNode(pParse, JSON_TRUE, 0, 0);
-    return i+4;
-  }else if( c=='f'
-         && strncmp(z+i,"false",5)==0
-         && !sqlite3Isalnum(z[i+5]) ){
-    jsonParseAddNode(pParse, JSON_FALSE, 0, 0);
-    return i+5;
-  }else if( c=='-' || (c>='0' && c<='9') ){
+  }
+  case 'n': {
+    if( strncmp(z+i,"null",4)==0 && !sqlite3Isalnum(z[i+4]) ){
+      jsonParseAddNode(pParse, JSON_NULL, 0, 0);
+      return i+4;
+    }
+    return -1;
+  }
+  case 't': {
+    if( strncmp(z+i,"true",4)==0 && !sqlite3Isalnum(z[i+4]) ){
+      jsonParseAddNode(pParse, JSON_TRUE, 0, 0);
+      return i+4;
+    }
+    return -1;
+  }
+  case 'f': {
+    if( strncmp(z+i,"false",5)==0 && !sqlite3Isalnum(z[i+5]) ){
+      jsonParseAddNode(pParse, JSON_FALSE, 0, 0);
+      return i+5;
+    }
+    return -1;
+  }
+  case '+':
+    pParse->has5 = 1;
+    /* fall through */
+  case '-':
+  case '0':
+  case '1':
+  case '2':
+  case '3':
+  case '4':
+  case '5':
+  case '6':
+  case '7':
+  case '8':
+  case '9': {
     /* Parse number */
     u8 seenDP = 0;
     u8 seenE = 0;
     assert( '-' < '0' );
+    assert( '+' < '0' );
+    assert( '.' < '0' );
+    c = z[i];
+
     if( c<='0' ){
-      j = c=='-' ? i+1 : i;
-      if( z[j]=='0' && z[j+1]>='0' && z[j+1]<='9' ) return -1;
+      if( c=='0' ){
+        if( sqlite3Isdigit(z[i+1]) ){
+          pParse->has5 = 1;
+        }
+      }else{
+        if( !sqlite3Isdigit(z[i+1]) ) return -1;
+        if( z[i+1]=='0' && sqlite3Isdigit(z[i+2]) ) pParse->has5 = 1;
+      }
     }
-    j = i+1;
-    for(;; j++){
+    for(j=i+1;; j++){
       c = z[j];
       if( c>='0' && c<='9' ) continue;
       if( c=='.' ){
@@ -1074,19 +1104,44 @@ json_parse_restart:
     jsonParseAddNode(pParse, seenDP ? JSON_REAL : JSON_INT,
                         j - i, &z[i]);
     return j;
-  }else if( c=='}' ){
+  }
+  case '}': {
     return -2;  /* End of {...} */
-  }else if( c==']' ){
+  }
+  case ']': {
     return -3;  /* End of [...] */
-  }else if( c==0 ){
+  }
+  case 0: {
     return 0;   /* End of file */
-  }else if( (j = json5Whitespace(&z[i]))>0 ){
-    i += j;
-    pParse->has5 = 1;
+  }
+  case 0x09:
+  case 0x0a:
+  case 0x0d:
+  case 0x20: {
+    do{
+      i++;
+    }while( fast_isspace(z[i]) );
     goto json_parse_restart;
-  }else{
+  }
+  case 0x0b:
+  case 0x0c:
+  case '/':
+  case 0xc2:
+  case 0xe1:
+  case 0xe2:
+  case 0xe3: {
+    j = json5Whitespace(&z[i]);
+    if( j>0 ){
+      i += j;
+      pParse->has5 = 1;
+      goto json_parse_restart;
+    }
+    return -1;
+  }
+  default: {
 #ifdef SQLITE_ENABLE_JSON_NAN_INF
     int k, nn;
+    c = z[i];
     for(k=0; k<sizeof(aNanInfName)/sizeof(aNanInfName[0]); k++){
       if( c!=aNanInfName[k].c1 && c!=aNanInfName[k].c2 ) continue;
       nn = aNanInfName[k].n;
@@ -1101,6 +1156,7 @@ json_parse_restart:
 #endif
     return -1;  /* Syntax error */
   }
+  } /* End switch(z[i]) */
 }
 
 /*
diff --git a/test/json102.test b/test/json102.test
index f551c4b82..d45ec11bf 100644
--- a/test/json102.test
+++ b/test/json102.test
@@ -301,18 +301,27 @@ for {set i 0} {$i<100} {incr i} {
 # allowing them.  The following tests verify that the problem is now
 # fixed.
 #
-do_execsql_test json102-1401 { SELECT json_valid('{"x":01}') } 0
-do_execsql_test json102-1402 { SELECT json_valid('{"x":-01}') } 0
-do_execsql_test json102-1403 { SELECT json_valid('{"x":0}') } 1
-do_execsql_test json102-1404 { SELECT json_valid('{"x":-0}') } 1
-do_execsql_test json102-1405 { SELECT json_valid('{"x":0.1}') } 1
-do_execsql_test json102-1406 { SELECT json_valid('{"x":-0.1}') } 1
-do_execsql_test json102-1407 { SELECT json_valid('{"x":0.0000}') } 1
-do_execsql_test json102-1408 { SELECT json_valid('{"x":-0.0000}') } 1
-do_execsql_test json102-1409 { SELECT json_valid('{"x":01.5}') } 0
-do_execsql_test json102-1410 { SELECT json_valid('{"x":-01.5}') } 0
-do_execsql_test json102-1411 { SELECT json_valid('{"x":00}') } 0
-do_execsql_test json102-1412 { SELECT json_valid('{"x":-00}') } 0
+foreach {id j x0 x5} {
+  1401 {'{"x":01}'} 0 1
+  1402 {'{"x":-01}'} 0 1
+  1403 {'{"x":0}'} 1 1
+  1404 {'{"x":-0}'} 1 1
+  1405 {'{"x":0.1}'} 1 1
+  1406 {'{"x":-0.1}'} 1 1
+  1407 {'{"x":0.0000}'} 1 1
+  1408 {'{"x":-0.0000}'} 1 1
+  1409 {'{"x":01.5}'} 0 1
+  1410 {'{"x":-01.5}'} 0 1
+  1411 {'{"x":00}'} 0 1
+  1412 {'{"x":-00}'} 0 1
+  1413 {'{"x":+0}'} 0 1
+  1414 {'{"x":+5}'} 0 1
+  1415 {'{"x":+5.5}'} 0 1
+} {
+  do_execsql_test json102-$id "
+     SELECT json_valid($j), json_valid5($j);
+  " [list $x0 $x5]
+}
 
 #------------------------------------------------------------------------
 # 2017-04-10 ticket 6c9b5514077fed34551f98e64c09a10dc2fc8e16