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Basic implementation of JsonTokenSeek()

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This commit is contained in:
Jordan Bancino 2022-08-02 21:47:27 -04:00
parent f48f7c088c
commit 7630294cb7
1 changed files with 168 additions and 2 deletions
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170
src/Json.c
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@ -649,19 +649,184 @@ JsonFree(HashMap * object)
HashMapFree(object);
}
static void
static int
JsonConsumeWhitespace(JsonParserState * state)
{
int c;
while (isspace(c = fgetc(state->stream)));
ungetc(c, state->stream);
return c;
}
static void
JsonTokenSeek(JsonParserState * state)
{
int c = JsonConsumeWhitespace(state);
if (feof(state->stream))
{
state->tokenType = TOKEN_EOF;
return;
}
if (state->token)
{
free(state->token);
state->token = NULL;
}
switch (c)
{
case ':':
state->tokenType = TOKEN_COLON;
break;
case ',':
state->tokenType = TOKEN_COMMA;
break;
case '{':
state->tokenType = TOKEN_OBJECT_OPEN;
break;
case '}':
state->tokenType = TOKEN_OBJECT_CLOSE;
break;
case '[':
state->tokenType = TOKEN_ARRAY_OPEN;
break;
case ']':
state->tokenType = TOKEN_ARRAY_CLOSE;
break;
case '"':
state->token = JsonDecodeString(state->stream);
if (!state->token)
{
state->tokenType = TOKEN_EOF;
return;
}
state->tokenType = TOKEN_STRING;
break;
default:
if (c == '-' || isdigit(c))
{
int isFloat = 0;
size_t allocated = 16;
size_t len = 1;
state->token = malloc(allocated);
if (!state->token)
{
state->tokenType = TOKEN_EOF;
return;
}
state->token[0] = c;
while ((c = fgetc(state->stream)) != EOF)
{
if (c == '.')
{
if (len > 1)
{
isFloat = 1;
}
else
{
state->tokenType = TOKEN_UNKNOWN;
return;
}
}
if (!isdigit(c))
{
ungetc(c, state->stream);
break;
}
if (len >= allocated)
{
char *tmp;
allocated += 16;
tmp = realloc(state->token, allocated);
if (!tmp)
{
state->tokenType = TOKEN_EOF;
return;
}
state->token = tmp;
}
state->token[len] = c;
len++;
}
if (state->token[len - 1] == '.')
{
state->tokenType = TOKEN_UNKNOWN;
return;
}
state->token[len] = '\0';
if (isFloat)
{
state->tokenType = TOKEN_FLOAT;
}
else
{
state->tokenType = TOKEN_INTEGER;
}
}
else
{
state->token = malloc(8);
if (!state->token)
{
state->tokenType = TOKEN_EOF;
return;
}
switch (c)
{
case 't':
fgets(state->token, 5, state->stream);
if (!strcmp("true", state->token))
{
state->tokenType = TOKEN_BOOLEAN;
}
else
{
state->tokenType = TOKEN_UNKNOWN;
}
break;
case 'f':
fgets(state->token, 6, state->stream);
if (!strcmp("false", state->token))
{
state->tokenType = TOKEN_BOOLEAN;
}
else
{
state->tokenType = TOKEN_UNKNOWN;
}
break;
case 'n':
fgets(state->token, 5, state->stream);
if (strcmp("null", state->token))
{
state->tokenType = TOKEN_NULL;
}
else
{
state->tokenType = TOKEN_UNKNOWN;
}
break;
default:
state->tokenType = TOKEN_UNKNOWN;
break;
}
}
}
}
static int
@ -688,6 +853,7 @@ JsonDecode(FILE * stream)
JsonParserState state;
state.stream = stream;
state.token = NULL;
return JsonDecodeObject(&state);
}