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Implement TrimStart TrimEnd and aliases (#4102)

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Based on: https://tc39.es/ecma262/#sec-string.prototype.trim

JerryScript-DCO-1.0-Signed-off-by: Bela Toth tbela@inf.u-szeged.hu
This commit is contained in:
Tóth Béla
2020-08-25 13:10:36 +02:00
committed by GitHub
parent 85981457e6
commit 09c8d28b2c
10 changed files with 172 additions and 91 deletions
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jerry-core/ecma/base/ecma-helpers-string.c
+60 -28
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@@ -2426,49 +2426,81 @@ ecma_string_substr (const ecma_string_t *string_p, /**< pointer to an ecma strin
* Helper function for trimming.
*
* Used by:
* - ecma_string_trim
* - ecma_utf8_string_to_number
* - ecma_string_trim_helper
* - ecma_builtin_global_object_parse_int
* - ecma_builtin_global_object_parse_float
*
* @return position of the first non whitespace character.
*/
void
ecma_string_trim_helper (const lit_utf8_byte_t **utf8_str_p, /**< [in, out] current string position */
lit_utf8_size_t *utf8_str_size) /**< [in, out] size of the given string */
const lit_utf8_byte_t *
ecma_string_trim_front (const lit_utf8_byte_t *start_p, /**< current string's start position */
const lit_utf8_byte_t *end_p) /**< current string's end position */
{
ecma_char_t ch;
lit_utf8_size_t read_size;
const lit_utf8_byte_t *nonws_start_p = *utf8_str_p + *utf8_str_size;
const lit_utf8_byte_t *current_p = *utf8_str_p;
while (current_p < nonws_start_p)
while (start_p < end_p)
{
read_size = lit_read_code_unit_from_utf8 (current_p, &ch);
if (!lit_char_is_white_space (ch))
{
nonws_start_p = current_p;
break;
}
current_p += read_size;
}
current_p = *utf8_str_p + *utf8_str_size;
while (current_p > nonws_start_p)
{
read_size = lit_read_prev_code_unit_from_utf8 (current_p, &ch);
lit_utf8_size_t read_size = lit_read_code_unit_from_utf8 (start_p, &ch);
if (!lit_char_is_white_space (ch))
{
break;
}
current_p -= read_size;
start_p += read_size;
}
*utf8_str_p = nonws_start_p;
*utf8_str_size = (lit_utf8_size_t) (current_p - nonws_start_p);
return start_p;
} /* ecma_string_trim_front */
/**
* Helper function for trimming.
*
* Used by:
* - ecma_string_trim_helper
*
* @return position of the last non whitespace character.
*/
const lit_utf8_byte_t *
ecma_string_trim_back (const lit_utf8_byte_t *start_p, /**< current string's start position */
const lit_utf8_byte_t *end_p) /**< current string's end position */
{
ecma_char_t ch;
while (end_p > start_p)
{
lit_utf8_size_t read_size = lit_read_prev_code_unit_from_utf8 (end_p, &ch);
if (!lit_char_is_white_space (ch))
{
break;
}
end_p -= read_size;
}
return end_p;
} /* ecma_string_trim_back */
/**
* Helper function for trimming.
*
* Used by:
* - ecma_string_trim
* - ecma_utf8_string_to_number
*/
inline void JERRY_ATTR_ALWAYS_INLINE
ecma_string_trim_helper (const lit_utf8_byte_t **utf8_str_p, /**< [in, out] current string position */
lit_utf8_size_t *utf8_str_size) /**< [in, out] size of the given string */
{
const lit_utf8_byte_t *end_p = *utf8_str_p + *utf8_str_size;
const lit_utf8_byte_t *start_p = *utf8_str_p;
const lit_utf8_byte_t *new_start_p = ecma_string_trim_front (start_p, end_p);
const lit_utf8_byte_t *new_end_p = ecma_string_trim_back (new_start_p, end_p);
*utf8_str_size = (lit_utf8_size_t) (new_end_p - new_start_p);
*utf8_str_p = new_start_p;
} /* ecma_string_trim_helper */
/**