From 00dea7e8c41b672730d6e2c891b6012a83d8842c Mon Sep 17 00:00:00 2001
From: Raiki Tamura <tamaron1203@gmail.com>
Date: Fri, 8 Sep 2023 16:59:09 +0200
Subject: [PATCH] libcpp: add function to check XID properties
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>
---
libcpp/charset.cc | 36 ++++++++++++++++++++++++++++++++++++
libcpp/include/cpplib.h | 7 +++++++
2 files changed, 43 insertions(+)
diff --git a/libcpp/charset.cc b/libcpp/charset.cc
index 95ca381eb7b1..54d7b9e09327 100644
--- a/libcpp/charset.cc
+++ b/libcpp/charset.cc
@@ -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
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index f699daaeb642..5746aac9ea42 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -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 */
--
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