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enhanced the json reader to handle unicode surrogate pairs

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This commit is contained in:
hyung-hwan 2020-06-08 11:08:22 +00:00
parent 9e0161c58f
commit a910dd533c
1 changed files with 32 additions and 15 deletions
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47
mio/lib/json.c
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@ -39,7 +39,7 @@ static void clear_token (mio_json_t* json)
if (json->tok_capa > 0) json->tok.ptr[json->tok.len] = '\0';
}
static int add_char_to_token (mio_json_t* json, mio_ooch_t ch)
static int add_char_to_token (mio_json_t* json, mio_ooch_t ch, int handle_surrogate_pair)
{
if (json->tok.len >= json->tok_capa)
{
@ -48,12 +48,34 @@ static int add_char_to_token (mio_json_t* json, mio_ooch_t ch)
newcapa = MIO_ALIGN_POW2(json->tok.len + 2, MIO_JSON_TOKEN_NAME_ALIGN); /* +2 here because of -1 when setting newcapa */
tmp = (mio_ooch_t*)mio_reallocmem(json->mio, json->tok.ptr, newcapa * MIO_SIZEOF(*tmp));
if (!tmp) return -1;
if (MIO_UNLIKELY(!tmp)) return -1;
json->tok_capa = newcapa - 1; /* -1 to secure space for terminating null */
json->tok.ptr = tmp;
}
#if (MIO_SIZEOF_OOCH_T >= 4)
if (handle_surrogate_pair && ch >= 0xDC00 && ch <= 0xDFFF && json->tok.len > 0)
{
/* RFC7159
To escape an extended character that is not in the Basic Multilingual
Plane, the character is represented as a 12-character sequence,
encoding the UTF-16 surrogate pair. So, for example, a string
containing only the G clef character (U+1D11E) may be represented as
"\uD834\uDD1E".
*/
mio_ooch_t pch = json->tok.ptr[json->tok.len - 1];
if (pch >= 0xD800 && pch <= 0xDBFF)
{
/* X = (character outside BMP) - 0x10000;
* W1 = high ten bits of X + 0xD800
* W2 = low ten bits of X + 0xDC00 */
json->tok.ptr[json->tok.len - 1] = (((pch - 0xD800) << 10) | (ch - 0xDC00)) + 0x10000;
return 0;
}
}
#endif
json->tok.ptr[json->tok.len++] = ch;
json->tok.ptr[json->tok.len] = '\0';
return 0;
@ -70,14 +92,13 @@ static int add_chars_to_token (mio_json_t* json, const mio_ooch_t* ptr, mio_oow_
newcapa = MIO_ALIGN_POW2(json->tok.len + len + 1, MIO_JSON_TOKEN_NAME_ALIGN);
tmp = (mio_ooch_t*)mio_reallocmem(json->mio, json->tok.ptr, newcapa * MIO_SIZEOF(*tmp));
if (!tmp) return -1;
if (MIO_UNLIKELY(!tmp)) return -1;
json->tok_capa = newcapa - 1;
json->tok.ptr = tmp;
}
for (i = 0; i < len; i++)
json->tok.ptr[json->tok.len++] = ptr[i];
for (i = 0; i < len; i++) json->tok.ptr[json->tok.len++] = ptr[i];
json->tok.ptr[json->tok.len] = '\0';
return 0;
}
@ -237,7 +258,7 @@ static int handle_string_value_char (mio_json_t* json, mio_ooci_t c)
ret = 0;
add_sv_acc:
#if defined(MIO_OOCH_IS_UCH)
if (add_char_to_token(json, json->state_stack->u.sv.acc) <= -1) return -1;
if (add_char_to_token(json, json->state_stack->u.sv.acc, json->state_stack->u.sv.escaped == 4) <= -1) return -1;
#else
/* convert the character to utf8 */
{
@ -274,10 +295,6 @@ static int handle_string_value_char (mio_json_t* json, mio_ooci_t c)
}
else if (c == 'u')
{
#if (MIO_SIZEOF_UCH_T > 2)
/* TOOD: handle UTF-16 surrogate pair U+1D11E -> \uD834\uDD1E*/
/* 0xD800-0xDBFF 0xDC00-0xDFFF */
#endif
json->state_stack->u.sv.escaped = 4;
json->state_stack->u.sv.digit_count = 0;
json->state_stack->u.sv.acc = 0;
@ -291,7 +308,7 @@ static int handle_string_value_char (mio_json_t* json, mio_ooci_t c)
else
{
json->state_stack->u.sv.escaped = 0;
if (add_char_to_token(json, unescape(c)) <= -1) return -1;
if (add_char_to_token(json, unescape(c), 0) <= -1) return -1;
}
}
else if (c == '\\')
@ -305,7 +322,7 @@ static int handle_string_value_char (mio_json_t* json, mio_ooci_t c)
}
else
{
if (add_char_to_token(json, c) <= -1) return -1;
if (add_char_to_token(json, c, 0) <= -1) return -1;
}
return ret;
@ -315,13 +332,13 @@ static int handle_numeric_value_char (mio_json_t* json, mio_ooci_t c)
{
if (mio_is_ooch_digit(c) || (json->tok.len == 0 && (c == '+' || c == '-')))
{
if (add_char_to_token(json, c) <= -1) return -1;
if (add_char_to_token(json, c, 0) <= -1) return -1;
return 1;
}
else if (!json->state_stack->u.nv.dotted && c == '.' &&
json->tok.len > 0 && mio_is_ooch_digit(json->tok.ptr[json->tok.len - 1]))
{
if (add_char_to_token(json, c) <= -1) return -1;
if (add_char_to_token(json, c, 0) <= -1) return -1;
json->state_stack->u.nv.dotted = 1;
return 1;
}
@ -344,7 +361,7 @@ static int handle_word_value_char (mio_json_t* json, mio_ooci_t c)
if (mio_is_ooch_alpha(c))
{
if (add_char_to_token(json, c) <= -1) return -1;
if (add_char_to_token(json, c, 0) <= -1) return -1;
return 1;
}