qjson: Give each of the six structural chars its own token type

Simplifies things, because we always check for a specific one.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1448486613-17634-6-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

include/qapi/qmp/json-lexer.h

@@ -19,7 +19,12 @@
 
 typedef enum json_token_type {
     JSON_MIN = 100,
-    JSON_OPERATOR = JSON_MIN,
+    JSON_LCURLY = JSON_MIN,
+    JSON_RCURLY,
+    JSON_LSQUARE,
+    JSON_RSQUARE,
+    JSON_COLON,
+    JSON_COMMA,
     JSON_INTEGER,
     JSON_FLOAT,
     JSON_KEYWORD,

qobject/json-lexer.c

@@ -257,12 +257,12 @@ static const uint8_t json_lexer[][256] =  {
         ['0'] = IN_ZERO,
         ['1' ... '9'] = IN_NONZERO_NUMBER,
         ['-'] = IN_NEG_NONZERO_NUMBER,
-        ['{'] = JSON_OPERATOR,
-        ['}'] = JSON_OPERATOR,
-        ['['] = JSON_OPERATOR,
-        [']'] = JSON_OPERATOR,
-        [','] = JSON_OPERATOR,
-        [':'] = JSON_OPERATOR,
+        ['{'] = JSON_LCURLY,
+        ['}'] = JSON_RCURLY,
+        ['['] = JSON_LSQUARE,
+        [']'] = JSON_RSQUARE,
+        [','] = JSON_COMMA,
+        [':'] = JSON_COLON,
         ['a' ... 'z'] = IN_KEYWORD,
         ['%'] = IN_ESCAPE,
         [' '] = IN_WHITESPACE,
@@ -299,7 +299,12 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
         }
 
         switch (new_state) {
-        case JSON_OPERATOR:
+        case JSON_LCURLY:
+        case JSON_RCURLY:
+        case JSON_LSQUARE:
+        case JSON_RSQUARE:
+        case JSON_COLON:
+        case JSON_COMMA:
         case JSON_ESCAPE:
         case JSON_INTEGER:
         case JSON_FLOAT:

qobject/json-parser.c

@@ -63,19 +63,6 @@ static JSONTokenType token_get_type(QObject *obj)
     return qdict_get_int(qobject_to_qdict(obj), "type");
 }
 
-static int token_is_operator(QObject *obj, char op)
-{
-    const char *val;
-
-    if (token_get_type(obj) != JSON_OPERATOR) {
-        return 0;
-    }
-
-    val = token_get_value(obj);
-
-    return (val[0] == op) && (val[1] == 0);
-}
-
 static int token_is_keyword(QObject *obj, const char *value)
 {
     if (token_get_type(obj) != JSON_KEYWORD) {
@@ -384,7 +371,7 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
         goto out;
     }
 
-    if (!token_is_operator(token, ':')) {
+    if (token_get_type(token) != JSON_COLON) {
         parse_error(ctxt, token, "missing : in object pair");
         goto out;
     }
@@ -419,7 +406,7 @@ static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
         goto out;
     }
 
-    if (!token_is_operator(token, '{')) {
+    if (token_get_type(token) != JSON_LCURLY) {
         goto out;
     }
 
@@ -431,7 +418,7 @@ static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
         goto out;
     }
 
-    if (!token_is_operator(peek, '}')) {
+    if (token_get_type(peek) != JSON_RCURLY) {
         if (parse_pair(ctxt, dict, ap) == -1) {
             goto out;
         }
@@ -442,8 +429,8 @@ static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
             goto out;
         }
 
-        while (!token_is_operator(token, '}')) {
-            if (!token_is_operator(token, ',')) {
+        while (token_get_type(token) != JSON_RCURLY) {
+            if (token_get_type(token) != JSON_COMMA) {
                 parse_error(ctxt, token, "expected separator in dict");
                 goto out;
             }
@@ -481,7 +468,7 @@ static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
         goto out;
     }
 
-    if (!token_is_operator(token, '[')) {
+    if (token_get_type(token) != JSON_LSQUARE) {
         goto out;
     }
 
@@ -493,7 +480,7 @@ static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
         goto out;
     }
 
-    if (!token_is_operator(peek, ']')) {
+    if (token_get_type(peek) != JSON_RSQUARE) {
         QObject *obj;
 
         obj = parse_value(ctxt, ap);
@@ -510,8 +497,8 @@ static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
             goto out;
         }
 
-        while (!token_is_operator(token, ']')) {
-            if (!token_is_operator(token, ',')) {
+        while (token_get_type(token) != JSON_RSQUARE) {
+            if (token_get_type(token) != JSON_COMMA) {
                 parse_error(ctxt, token, "expected separator in list");
                 goto out;
             }

qobject/json-streamer.c

@@ -26,23 +26,21 @@ static void json_message_process_token(JSONLexer *lexer, QString *token, JSONTok
     JSONMessageParser *parser = container_of(lexer, JSONMessageParser, lexer);
     QDict *dict;
 
-    if (type == JSON_OPERATOR) {
-        switch (qstring_get_str(token)[0]) {
-        case '{':
-            parser->brace_count++;
-            break;
-        case '}':
-            parser->brace_count--;
-            break;
-        case '[':
-            parser->bracket_count++;
-            break;
-        case ']':
-            parser->bracket_count--;
-            break;
-        default:
-            break;
-        }
+    switch (type) {
+    case JSON_LCURLY:
+        parser->brace_count++;
+        break;
+    case JSON_RCURLY:
+        parser->brace_count--;
+        break;
+    case JSON_LSQUARE:
+        parser->bracket_count++;
+        break;
+    case JSON_RSQUARE:
+        parser->bracket_count--;
+        break;
+    default:
+        break;
     }
 
     dict = qdict_new();