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libcpp: add function to check XID properties

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This commit adds a new function intended for checking the XID properties
of a possibly unicode character, as well as the accompanying enum
describing the possible properties.

libcpp/ChangeLog:

	* charset.cc (cpp_check_xid_property): New.
	* include/cpplib.h
	(cpp_check_xid_property): New.
	(enum cpp_xid_property): New.

Signed-off-by: Raiki Tamura <tamaron1203@gmail.com>
This commit is contained in:
Raiki Tamura 2023-09-08 16:59:09 +02:00 • committed by Arthur Cohen
parent 4ded42c2c5
commit 00dea7e8c4
2 changed files with 43 additions and 0 deletions
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36
libcpp/charset.cc
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@ -1332,6 +1332,42 @@ _cpp_uname2c_uax44_lm2 (const char *name, size_t len, char *canon_name)
return result;
}
/* Returns flags representing the XID properties of the given codepoint. */
unsigned int
cpp_check_xid_property (cppchar_t c)
{
// fast path for ASCII
if (c < 0x80)
{
if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z'))
return CPP_XID_START | CPP_XID_CONTINUE;
if (('0' <= c && c <= '9') || c == '_')
return CPP_XID_CONTINUE;
}
if (c > UCS_LIMIT)
return 0;
int mn, mx, md;
mn = 0;
mx = ARRAY_SIZE (ucnranges) - 1;
while (mx != mn)
{
md = (mn + mx) / 2;
if (c <= ucnranges[md].end)
mx = md;
else
mn = md + 1;
}
unsigned short flags = ucnranges[mn].flags;
if (flags & CXX23)
return CPP_XID_START | CPP_XID_CONTINUE;
if (flags & NXX23)
return CPP_XID_CONTINUE;
return 0;
}
/* Returns 1 if C is valid in an identifier, 2 if C is valid except at
the start of an identifier, and 0 if C is not valid in an

7
libcpp/include/cpplib.h
View file

@ -1631,4 +1631,11 @@ bool cpp_valid_utf8_p (const char *data, size_t num_bytes);
bool cpp_is_combining_char (cppchar_t c);
bool cpp_is_printable_char (cppchar_t c);
enum cpp_xid_property {
CPP_XID_START = 1,
CPP_XID_CONTINUE = 2
};
unsigned int cpp_check_xid_property (cppchar_t c);
#endif /* ! LIBCPP_CPPLIB_H */