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Global object unescape routine

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JerryScript-DCO-1.0-Signed-off-by: Szilard Ledan szledan.u-szeged@partner.samsung.com
This commit is contained in:
Szilard Ledan
2015-08-28 11:22:04 +02:00
parent 90122d9f33
commit 36e90d952f
4 changed files with 129 additions and 1 deletions
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jerry-core/ecma/builtin-objects/ecma-builtin-global.cpp
+97
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@@ -1364,6 +1364,103 @@ ecma_builtin_global_object_escape (ecma_value_t this_arg __attr_unused___, /**<
return ret_value;
} /* ecma_builtin_global_object_escape */
/**
* The Global object's 'unescape' routine
*
* See also:
* ECMA-262 v5, B.2.2
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value.
*/
static ecma_completion_value_t
ecma_builtin_global_object_unescape (ecma_value_t this_arg __attr_unused___, /**< this argument */
ecma_value_t arg) /**< routine's first argument */
{
ecma_completion_value_t ret_value = ecma_make_empty_completion_value ();
/* 1. */
ECMA_TRY_CATCH (string, ecma_op_to_string (arg), ret_value);
ecma_string_t *input_string_p = ecma_get_string_from_value (string);
/* 2. */
lit_utf8_size_t input_size = ecma_string_get_size (input_string_p);
/* 3. */
MEM_DEFINE_LOCAL_ARRAY (input_start_p, input_size, lit_utf8_byte_t);
ssize_t sz = ecma_string_to_utf8_string (input_string_p, input_start_p, (ssize_t) (input_size));
JERRY_ASSERT (sz >= 0);
lit_utf8_byte_t *input_curr_p = input_start_p;
lit_utf8_byte_t *input_end_p = input_start_p + input_size;
/* 4. */
/* The length of input string is always greater than output string
* so we re-use the input string buffer.
* The %xx is three byte long, and the maximum encoded value is 0xff,
* which maximum encoded length is two byte. Similar to this, the maximum
* encoded length of %uxxxx is four byte. */
lit_utf8_byte_t *output_char_p = input_start_p;
/* The state of parsing that tells us where we are in an escape pattern.
* 0 we are outside of pattern,
* 1 found '%', start of pattern,
* 2 found first hex digit of '%xy' pattern
* 3 found valid '%xy' pattern
* 4 found 'u', start of '%uwxyz' pattern
* 5-7 found hex digits of '%uwxyz' pattern
* 8 found valid '%uwxyz' pattern
*/
uint8_t status = 0;
ecma_char_t hex_digits = 0;
/* 5. */
while (input_curr_p < input_end_p)
{
/* 6. */
ecma_char_t chr = lit_utf8_read_next (&input_curr_p);
/* 7-8. */
if (status == 0 && chr == LIT_CHAR_PERCENT)
{
/* Found '%' char, start of escape sequence. */
status = 1;
}
/* 9-10. */
else if (status == 1 && chr == LIT_CHAR_LOWERCASE_U)
{
/* Found 'u' char after '%'. */
status = 4;
}
else if (status > 0 && lit_char_is_hex_digit (chr))
{
/* Found hexadecimal digit in escape sequence. */
hex_digits = (ecma_char_t) (hex_digits * 16 + (ecma_char_t) lit_char_hex_to_int (chr));
status++;
}
/* 11-17. Found valid '%uwxyz' or '%xy' escape. */
if (status == 8 || status == 3)
{
output_char_p -= (status == 3) ? 2 : 5;
status = 0;
chr = hex_digits;
hex_digits = 0;
}
/* Copying character. */
lit_utf8_size_t lit_size = lit_code_unit_to_utf8 (chr, output_char_p);
output_char_p += lit_size;
JERRY_ASSERT (output_char_p <= input_curr_p);
}
lit_utf8_size_t output_length = (lit_utf8_size_t) (output_char_p - input_start_p);
ecma_string_t *output_string_p = ecma_new_ecma_string_from_utf8 (input_start_p, output_length);
ret_value = ecma_make_normal_completion_value (ecma_make_string_value (output_string_p));
MEM_FINALIZE_LOCAL_ARRAY (input_start_p);
ECMA_FINALIZE (string);
return ret_value;
} /* ecma_builtin_global_object_unescape */
#endif /* CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ANNEXB_BUILTIN */
/**
jerry-core/ecma/builtin-objects/ecma-builtin-global.inc.h
+1
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@@ -237,6 +237,7 @@ ROUTINE (LIT_MAGIC_STRING_PARSE_INT, ecma_builtin_global_object_parse_int, 2, 2)
#ifndef CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ANNEXB_BUILTIN
ROUTINE (LIT_MAGIC_STRING_ESCAPE, ecma_builtin_global_object_escape, 1, 1)
ROUTINE (LIT_MAGIC_STRING_UNESCAPE, ecma_builtin_global_object_unescape, 1, 1)
#endif /* CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ANNEXB_BUILTIN */
#undef OBJECT_ID
jerry-core/lit/lit-magic-strings.inc.h
+1
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@@ -73,6 +73,7 @@ LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_DECODE_URI_COMPONENT, "decodeURIComponent
LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_ENCODE_URI, "encodeURI")
LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_ENCODE_URI_COMPONENT, "encodeURIComponent")
LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_ESCAPE, "escape")
LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_UNESCAPE, "unescape")
LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_GET_PROTOTYPE_OF_UL, "getPrototypeOf")
LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_GET_OWN_PROPERTY_DESCRIPTOR_UL, "getOwnPropertyDescriptor")
LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_GET_OWN_PROPERTY_NAMES_UL, "getOwnPropertyNames")