Do not consider an empty string to be valid JSON. Add some additional

JSON test cases.

FossilOrigin-Name: fd19ff029f128f478f69910352a6f8b84262ce1d

ext/misc/json1.c

@@ -690,7 +690,7 @@ static int jsonParseValue(JsonParse *pParse, u32 i){
           j++;
           c = pParse->zJson[j+1];
         }
-        if( c<'0' || c>'0' ) return -1;
+        if( c<'0' || c>'9' ) return -1;
         continue;
       }
       break;
@@ -730,7 +730,7 @@ static int jsonParse(
     while( isspace(zJson[i]) ) i++;
     if( zJson[i] ) i = -1;
   }
-  if( i<0 ){
+  if( i<=0 ){
     if( pCtx!=0 ){
       if( pParse->oom ){
         sqlite3_result_error_nomem(pCtx);

manifest

@@ -1,5 +1,5 @@
-C Change\sthe\sjson1.c\smodule\sso\sthat\sit\sthrows\san\serror\sif\sany\sof\sthe\nJSON\sselector\spaths\sare\smalformed.
-D 2015-08-29T00:54:49.924
+C Do\snot\sconsider\san\sempty\sstring\sto\sbe\svalid\sJSON.\s\sAdd\ssome\sadditional\nJSON\stest\scases.
+D 2015-08-29T16:02:37.845
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in e2218eb228374422969de7b1680eda6864affcef
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -192,7 +192,7 @@ F ext/misc/eval.c f971962e92ebb8b0a4e6b62949463ee454d88fa2
 F ext/misc/fileio.c d4171c815d6543a9edef8308aab2951413cd8d0f
 F ext/misc/fuzzer.c 4c84635c71c26cfa7c2e5848cf49fe2d2cfcd767
 F ext/misc/ieee754.c b0362167289170627659e84173f5d2e8fee8566e
-F ext/misc/json1.c 063bf62fd44a06aa06fd22854fff09679cbb855f
+F ext/misc/json1.c 232a3125fc468e9075f569b1b543b797fd4e0f81
 F ext/misc/nextchar.c 35c8b8baacb96d92abbb34a83a997b797075b342
 F ext/misc/percentile.c bcbee3c061b884eccb80e21651daaae8e1e43c63
 F ext/misc/regexp.c af92cdaa5058fcec1451e49becc7ba44dba023dc
@@ -810,7 +810,7 @@ F test/journal3.test ff8af941f9e06161d3db1b46bb9f965ff0e7f307
 F test/jrnlmode.test 7864d59cf7f6e552b9b99ba0f38acd167edc10fa
 F test/jrnlmode2.test 81610545a4e6ed239ea8fa661891893385e23a1d
 F test/jrnlmode3.test 556b447a05be0e0963f4311e95ab1632b11c9eaa
-F test/json101.test 5dfb181790c123123c8e7981d4d3c941b6cc8af4
+F test/json101.test ef8fb3ac6a59b9a435c9fec7a4eb6413ecf76531
 F test/keyword1.test 37ef6bba5d2ed5b07ecdd6810571de2956599dff
 F test/lastinsert.test 42e948fd6442f07d60acbd15d33fb86473e0ef63
 F test/laststmtchanges.test ae613f53819206b3222771828d024154d51db200
@@ -1380,7 +1380,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P dc9ce7b18cbe23d065317757234ef9fb8792da7a
-R 7515083280f6e706dffbefc132c1a59a
+P 3aa0855fd463076fc3277f1d9fe00d2f30e6b449
+R 3daa1648ff31e492e4e517b1729e3cd5
 U drh
-Z f18bb212545a9a98b8ef3bc5262369aa
+Z 4768dfaa3613e1e500aa484aea396edc

manifest.uuid

@@ -1 +1 @@
-3aa0855fd463076fc3277f1d9fe00d2f30e6b449
+fd19ff029f128f478f69910352a6f8b84262ce1d

test/json101.test

@@ -63,4 +63,54 @@ do_execsql_test json1-3.4 {
   SELECT json_type(json_set('{"a":1,"b":2}','$$.b','{"x":3,"y":4}'),'$.b');
 } {object}
 
+# Per rfc7159, any JSON value is allowed at the top level, and whitespace
+# is permitting before and/or after that value.
+#
+do_execsql_test json1-4.1 {
+  CREATE TABLE j1(x);
+  INSERT INTO j1(x)
+   VALUES('true'),('false'),('null'),('123'),('-234'),('34.5e+6'),
+         ('""'),('"\""'),('"\\"'),('"abcdefghijlmnopqrstuvwxyz"'),
+         ('[]'),('{}'),('[true,false,null,123,-234,34.5e+6,{},[]]'),
+         ('{"a":true,"b":{"c":false}}');
+  SELECT * FROM j1 WHERE NOT json_valid(x);
+} {}
+do_execsql_test json1-4.2 {
+  SELECT * FROM j1 WHERE NOT json_valid(char(0x20,0x09,0x0a,0x0d)||x);
+} {}
+do_execsql_test json1-4.3 {
+  SELECT * FROM j1 WHERE NOT json_valid(x||char(0x20,0x09,0x0a,0x0d));
+} {}
+
+# But an empty string, or a string of pure whitespace is not valid JSON.
+#
+do_execsql_test json1-4.4 {
+  SELECT json_valid(''), json_valid(char(0x20,0x09,0x0a,0x0d));
+} {0 0}
+
+# json_remove() and similar functions with no edit operations return their
+# input unchanged.
+#
+do_execsql_test json1-4.5 {
+  SELECT x FROM j1 WHERE json_remove(x)<>x;
+} {}
+do_execsql_test json1-4.6 {
+  SELECT x FROM j1 WHERE json_replace(x)<>x;
+} {}
+do_execsql_test json1-4.7 {
+  SELECT x FROM j1 WHERE json_set(x)<>x;
+} {}
+do_execsql_test json1-4.8 {
+  SELECT x FROM j1 WHERE json_insert(x)<>x;
+} {}
+
+# json_extract(JSON,'$') will return objects and arrays without change.
+#
+do_execsql_test json-4.10 {
+  SELECT count(*) FROM j1 WHERE json_type(x) IN ('object','array');
+  SELECT x FROM j1
+   WHERE json_extract(x,'$')<>x
+     AND json_type(x) IN ('object','array');
+} {4}
+
 finish_test