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Implement \u{hex} support. (#3447)

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A large rework because surrogate pairs must be combined.

Currently only the 0x10C80..0x10CF2 is accepted as valid identifier character from the non-basic plane.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2019-12-16 11:26:02 +01:00
committed by Dániel Bátyai
parent 1db16c3a1c
commit 40d930d62c
22 changed files with 765 additions and 370 deletions
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jerry-core/lit/lit-char-helpers.c
+88 -82
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@@ -200,73 +200,33 @@ lit_char_is_unicode_non_letter_ident_part (ecma_char_t c) /**< code unit */
NUM_OF_ELEMENTS (lit_unicode_non_letter_ident_part_chars)));
} /* lit_char_is_unicode_non_letter_ident_part */
/**
* Checks whether the next UTF8 character is a valid identifier start.
*
* @return true if it is.
*/
bool
lit_char_is_identifier_start (const uint8_t *src_p) /**< pointer to a vaild UTF8 character */
{
if (*src_p <= LIT_UTF8_1_BYTE_CODE_POINT_MAX)
{
return lit_char_is_identifier_start_character (*src_p);
}
/* ECMAScript 2015 specification allows some code points in supplementary plane.
* However, we don't permit characters in supplementary characters as start of identifier.
*/
if ((*src_p & LIT_UTF8_4_BYTE_MASK) == LIT_UTF8_4_BYTE_MARKER)
{
return false;
}
return lit_char_is_identifier_start_character (lit_utf8_peek_next (src_p));
} /* lit_char_is_identifier_start */
/**
* Checks whether the character is a valid identifier start.
*
* @return true if it is.
*/
bool
lit_char_is_identifier_start_character (uint16_t chr) /**< EcmaScript character */
lit_code_point_is_identifier_start (lit_code_point_t code_point) /**< code point */
{
/* Fast path for ASCII-defined letters. */
if (chr <= LIT_UTF8_1_BYTE_CODE_POINT_MAX)
if (code_point <= LIT_UTF8_1_BYTE_CODE_POINT_MAX)
{
return ((LEXER_TO_ASCII_LOWERCASE (chr) >= LIT_CHAR_LOWERCASE_A
&& LEXER_TO_ASCII_LOWERCASE (chr) <= LIT_CHAR_LOWERCASE_Z)
|| chr == LIT_CHAR_DOLLAR_SIGN
|| chr == LIT_CHAR_UNDERSCORE);
return ((LEXER_TO_ASCII_LOWERCASE (code_point) >= LIT_CHAR_LOWERCASE_A
&& LEXER_TO_ASCII_LOWERCASE (code_point) <= LIT_CHAR_LOWERCASE_Z)
|| code_point == LIT_CHAR_DOLLAR_SIGN
|| code_point == LIT_CHAR_UNDERSCORE);
}
return lit_char_is_unicode_letter (chr);
} /* lit_char_is_identifier_start_character */
/**
* Checks whether the next UTF8 character is a valid identifier part.
*
* @return true if it is.
*/
bool
lit_char_is_identifier_part (const uint8_t *src_p) /**< pointer to a vaild UTF8 character */
{
if (*src_p <= LIT_UTF8_1_BYTE_CODE_POINT_MAX)
#if ENABLED (JERRY_ES2015)
if (code_point >= LIT_UTF8_4_BYTE_CODE_POINT_MIN)
{
return lit_char_is_identifier_part_character (*src_p);
/* TODO: detect these ranges correctly. */
return (code_point >= 0x10C80 && code_point <= 0x10CF2);
}
#endif /* ENABLED (JERRY_ES2015) */
/* ECMAScript 2015 specification allows some code points in supplementary plane.
* However, we don't permit characters in supplementary characters as part of identifier.
*/
if ((*src_p & LIT_UTF8_4_BYTE_MASK) == LIT_UTF8_4_BYTE_MARKER)
{
return false;
}
return lit_char_is_identifier_part_character (lit_utf8_peek_next (src_p));
} /* lit_char_is_identifier_part */
return lit_char_is_unicode_letter ((ecma_char_t) code_point);
} /* lit_code_point_is_identifier_start */
/**
* Checks whether the character is a valid identifier part.
@@ -274,21 +234,29 @@ lit_char_is_identifier_part (const uint8_t *src_p) /**< pointer to a vaild UTF8
* @return true if it is.
*/
bool
lit_char_is_identifier_part_character (uint16_t chr) /**< EcmaScript character */
lit_code_point_is_identifier_part (lit_code_point_t code_point) /**< code point */
{
/* Fast path for ASCII-defined letters. */
if (chr <= LIT_UTF8_1_BYTE_CODE_POINT_MAX)
if (code_point <= LIT_UTF8_1_BYTE_CODE_POINT_MAX)
{
return ((LEXER_TO_ASCII_LOWERCASE (chr) >= LIT_CHAR_LOWERCASE_A
&& LEXER_TO_ASCII_LOWERCASE (chr) <= LIT_CHAR_LOWERCASE_Z)
|| (chr >= LIT_CHAR_0 && chr <= LIT_CHAR_9)
|| chr == LIT_CHAR_DOLLAR_SIGN
|| chr == LIT_CHAR_UNDERSCORE);
return ((LEXER_TO_ASCII_LOWERCASE (code_point) >= LIT_CHAR_LOWERCASE_A
&& LEXER_TO_ASCII_LOWERCASE (code_point) <= LIT_CHAR_LOWERCASE_Z)
|| (code_point >= LIT_CHAR_0 && code_point <= LIT_CHAR_9)
|| code_point == LIT_CHAR_DOLLAR_SIGN
|| code_point == LIT_CHAR_UNDERSCORE);
}
return (lit_char_is_unicode_letter (chr)
|| lit_char_is_unicode_non_letter_ident_part (chr));
} /* lit_char_is_identifier_part_character */
#if ENABLED (JERRY_ES2015)
if (code_point >= LIT_UTF8_4_BYTE_CODE_POINT_MIN)
{
/* TODO: detect these ranges correctly. */
return (code_point >= 0x10C80 && code_point <= 0x10CF2);
}
#endif /* ENABLED (JERRY_ES2015) */
return (lit_char_is_unicode_letter ((ecma_char_t) code_point)
|| lit_char_is_unicode_non_letter_ident_part ((ecma_char_t) code_point));
} /* lit_code_point_is_identifier_part */
/**
* Check if specified character is one of OctalDigit characters (ECMA-262 v5, B.1.2)
@@ -356,30 +324,47 @@ lit_char_hex_to_int (ecma_char_t c) /**< code unit, corresponding to
* @return length of the UTF8 representation.
*/
size_t
lit_char_to_utf8_bytes (uint8_t *dst_p, /**< destination buffer */
ecma_char_t chr) /**< EcmaScript character */
lit_code_point_to_cesu8_bytes (uint8_t *dst_p, /**< destination buffer */
lit_code_point_t code_point) /**< code point */
{
if (!(chr & ~LIT_UTF8_1_BYTE_CODE_POINT_MAX))
if (code_point < LIT_UTF8_2_BYTE_CODE_POINT_MIN)
{
/* 00000000 0xxxxxxx -> 0xxxxxxx */
*dst_p = (uint8_t) chr;
dst_p[0] = (uint8_t) code_point;
return 1;
}
if (!(chr & ~LIT_UTF8_2_BYTE_CODE_POINT_MAX))
if (code_point < LIT_UTF8_3_BYTE_CODE_POINT_MIN)
{
/* 00000yyy yyxxxxxx -> 110yyyyy 10xxxxxx */
*(dst_p++) = (uint8_t) (LIT_UTF8_2_BYTE_MARKER | ((chr >> 6) & LIT_UTF8_LAST_5_BITS_MASK));
*dst_p = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | (chr & LIT_UTF8_LAST_6_BITS_MASK));
dst_p[0] = (uint8_t) (LIT_UTF8_2_BYTE_MARKER | ((code_point >> 6) & LIT_UTF8_LAST_5_BITS_MASK));
dst_p[1] = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | (code_point & LIT_UTF8_LAST_6_BITS_MASK));
return 2;
}
/* zzzzyyyy yyxxxxxx -> 1110zzzz 10yyyyyy 10xxxxxx */
*(dst_p++) = (uint8_t) (LIT_UTF8_3_BYTE_MARKER | ((chr >> 12) & LIT_UTF8_LAST_4_BITS_MASK));
*(dst_p++) = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | ((chr >> 6) & LIT_UTF8_LAST_6_BITS_MASK));
*dst_p = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | (chr & LIT_UTF8_LAST_6_BITS_MASK));
return 3;
} /* lit_char_to_utf8_bytes */
if (code_point < LIT_UTF8_4_BYTE_CODE_POINT_MIN)
{
/* zzzzyyyy yyxxxxxx -> 1110zzzz 10yyyyyy 10xxxxxx */
dst_p[0] = (uint8_t) (LIT_UTF8_3_BYTE_MARKER | ((code_point >> 12) & LIT_UTF8_LAST_4_BITS_MASK));
dst_p[1] = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | ((code_point >> 6) & LIT_UTF8_LAST_6_BITS_MASK));
dst_p[2] = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | (code_point & LIT_UTF8_LAST_6_BITS_MASK));
return 3;
}
JERRY_ASSERT (code_point <= LIT_UNICODE_CODE_POINT_MAX);
code_point -= LIT_UTF8_4_BYTE_CODE_POINT_MIN;
dst_p[0] = (uint8_t) (LIT_UTF8_3_BYTE_MARKER | 0xd);
dst_p[1] = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | 0x20 | ((code_point >> 16) & LIT_UTF8_LAST_4_BITS_MASK));
dst_p[2] = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | ((code_point >> 10) & LIT_UTF8_LAST_6_BITS_MASK));
dst_p[3] = (uint8_t) (LIT_UTF8_3_BYTE_MARKER | 0xd);
dst_p[4] = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | 0x30 | ((code_point >> 6) & LIT_UTF8_LAST_4_BITS_MASK));
dst_p[5] = (uint8_t) (LIT_UTF8_EXTRA_BYTE_MARKER | (code_point & LIT_UTF8_LAST_6_BITS_MASK));
return 3 * 2;
} /* lit_code_point_to_cesu8_bytes */
/**
* Returns the length of the UTF8 representation of a character.
@@ -387,23 +372,44 @@ lit_char_to_utf8_bytes (uint8_t *dst_p, /**< destination buffer */
* @return length of the UTF8 representation.
*/
size_t
lit_char_get_utf8_length (ecma_char_t chr) /**< EcmaScript character */
lit_code_point_get_cesu8_length (lit_code_point_t code_point) /**< code point */
{
if (!(chr & ~LIT_UTF8_1_BYTE_CODE_POINT_MAX))
if (code_point < LIT_UTF8_2_BYTE_CODE_POINT_MIN)
{
/* 00000000 0xxxxxxx */
return 1;
}
if (!(chr & ~LIT_UTF8_2_BYTE_CODE_POINT_MAX))
if (code_point < LIT_UTF8_3_BYTE_CODE_POINT_MIN)
{
/* 00000yyy yyxxxxxx */
return 2;
}
/* zzzzyyyy yyxxxxxx */
return 3;
} /* lit_char_get_utf8_length */
if (code_point < LIT_UTF8_4_BYTE_CODE_POINT_MIN)
{
/* zzzzyyyy yyxxxxxx */
return 3;
}
/* high + low surrogate */
return 2 * 3;
} /* lit_code_point_get_cesu8_length */
/**
* Convert a four byte long utf8 character to two three byte long cesu8 characters
*/
void
lit_four_byte_utf8_char_to_cesu8 (uint8_t *dst_p, /**< destination buffer */
const uint8_t *source_p) /**< source buffer */
{
lit_code_point_t code_point = ((((uint32_t) source_p[0]) & LIT_UTF8_LAST_3_BITS_MASK) << 18);
code_point |= ((((uint32_t) source_p[1]) & LIT_UTF8_LAST_6_BITS_MASK) << 12);
code_point |= ((((uint32_t) source_p[2]) & LIT_UTF8_LAST_6_BITS_MASK) << 6);
code_point |= (((uint32_t) source_p[3]) & LIT_UTF8_LAST_6_BITS_MASK);
lit_code_point_to_cesu8_bytes (dst_p, code_point);
} /* lit_four_byte_utf8_char_to_cesu8 */
/**
* Parse the next number_of_characters hexadecimal character,