* regenc.c (onigenc_not_support_case_map): Rewrite to work correctly

  in ASCII range.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55299 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 26 insertions, 3 deletions

diff --git a/regenc.c b/regenc.c
index 4c466aedbb..eb159af79b 100644
--- a/regenc.c
+++ b/regenc.c
@@ -578,10 +578,33 @@ onigenc_not_support_get_ctype_code_range(OnigCtype ctype ARG_UNUSED,
 
 #ifdef ONIG_CASE_MAPPING
 extern int
-onigenc_not_support_case_map (OnigCaseFoldType* flagP, const OnigUChar** pp, const OnigUChar* end, OnigUChar* to, OnigUChar* to_end, const struct OnigEncodingTypeST* enc)
+onigenc_not_support_case_map (OnigCaseFoldType* flagP, const OnigUChar** pp, const OnigUChar* end,
+			      OnigUChar* to, OnigUChar* to_end, const struct OnigEncodingTypeST* enc)
 {
-    fprintf(stderr, "Unimplemented case mapping functionality: onigenc_not_support_case_map\n");
-    return ONIG_NO_SUPPORT_CONFIG;
+  OnigCodePoint code;
+  OnigUChar *to_start = to;
+  OnigCaseFoldType flags = *flagP;
+  int codepoint_length;
+
+  to_end -= 4; /* longest possible length of a single character */
+
+  while (*pp<end && to<=to_end) {
+    codepoint_length = ONIGENC_PRECISE_MBC_ENC_LEN(enc, *pp, end);
+    if (codepoint_length < 0)
+      return codepoint_length; /* encoding invalid */
+    code = ONIGENC_MBC_TO_CODE(enc, *pp, end);
+    *pp += codepoint_length;
+
+    if (code>='a' && code<='z' && (flags&ONIGENC_CASE_UPCASE))
+      flags |= ONIGENC_CASE_MODIFIED,  code += 'A'-'a';
+    else if (code>='A' && code<='Z' && (flags&(ONIGENC_CASE_DOWNCASE|ONIGENC_CASE_FOLD)))
+      flags |= ONIGENC_CASE_MODIFIED,  code += 'a'-'A';
+    to += ONIGENC_CODE_TO_MBC(enc, code, to);
+    if (flags & ONIGENC_CASE_TITLECASE)  /* switch from titlecase to lowercase for capitalize */
+      flags ^= (ONIGENC_CASE_UPCASE|ONIGENC_CASE_DOWNCASE|ONIGENC_CASE_TITLECASE);
+  }
+  *flagP = flags;
+  return (int)(to-to_start);
 }
 #endif   /* ONIG_CASE_MAPPING */