* Makefile.in, */Makefile.sub (VPATH): add enc directory.

* common.mk (ENCOBJS): encoding objects.

* enc: directory for encodings.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13675 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 334 insertions, 0 deletions

diff --git a/enc/utf8.c b/enc/utf8.c
new file mode 100644
index 0000000000..3add59f475
--- /dev/null
+++ b/enc/utf8.c
@@ -0,0 +1,334 @@
+/**********************************************************************
+  utf8.c -  Oniguruma (regular expression library)
+**********************************************************************/
+/*-
+ * Copyright (c) 2002-2007  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "regenc.h"
+
+#define USE_INVALID_CODE_SCHEME
+
+#ifdef USE_INVALID_CODE_SCHEME
+/* virtual codepoint values for invalid encoding byte 0xfe and 0xff */
+#define INVALID_CODE_FE   0xfffffffe
+#define INVALID_CODE_FF   0xffffffff
+#define VALID_CODE_LIMIT  0x7fffffff
+#endif
+
+#define utf8_islead(c)     ((UChar )((c) & 0xc0) != 0x80)
+
+static const int EncLen_UTF8[] = {
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+  4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1
+};
+
+static int
+utf8_mbc_enc_len(const UChar* p, const UChar* e, OnigEncoding enc)
+{
+  return EncLen_UTF8[*p];
+}
+
+static int
+utf8_is_mbc_newline(const UChar* p, const UChar* end, OnigEncoding enc)
+{
+  if (p < end) {
+    if (*p == 0x0a) return 1;
+
+#ifdef USE_UNICODE_ALL_LINE_TERMINATORS
+#ifndef USE_CRNL_AS_LINE_TERMINATOR
+    if (*p == 0x0d) return 1;
+#endif
+    if (p + 1 < end) {
+      if (*(p+1) == 0x85 && *p == 0xc2) /* U+0085 */
+	return 1;
+      if (p + 2 < end) {
+	if ((*(p+2) == 0xa8 || *(p+2) == 0xa9)
+	    && *(p+1) == 0x80 && *p == 0xe2)  /* U+2028, U+2029 */
+	  return 1;
+      }
+    }
+#endif
+  }
+
+  return 0;
+}
+
+static OnigCodePoint
+utf8_mbc_to_code(const UChar* p, const UChar* end, OnigEncoding enc)
+{
+  int c, len;
+  OnigCodePoint n;
+
+  len = enc_len(ONIG_ENCODING_UTF8, p, end);
+  c = *p++;
+  if (len > 1) {
+    len--;
+    n = c & ((1 << (6 - len)) - 1);
+    while (len--) {
+      c = *p++;
+      n = (n << 6) | (c & ((1 << 6) - 1));
+    }
+    return n;
+  }
+  else {
+#ifdef USE_INVALID_CODE_SCHEME
+    if (c > 0xfd) {
+      return ((c == 0xfe) ? INVALID_CODE_FE : INVALID_CODE_FF);
+    }
+#endif
+    return (OnigCodePoint )c;
+  }
+}
+
+static int
+utf8_code_to_mbclen(OnigCodePoint code, OnigEncoding enc)
+{
+  if      ((code & 0xffffff80) == 0) return 1;
+  else if ((code & 0xfffff800) == 0) {
+    if (code <= 0xff && code >= 0xfe)
+      return 1;
+    return 2;
+  }
+  else if ((code & 0xffff0000) == 0) return 3;
+  else if ((code & 0xffe00000) == 0) return 4;
+  else if ((code & 0xfc000000) == 0) return 5;
+  else if ((code & 0x80000000) == 0) return 6;
+#ifdef USE_INVALID_CODE_SCHEME
+  else if (code == INVALID_CODE_FE) return 1;
+  else if (code == INVALID_CODE_FF) return 1;
+#endif
+  else
+    return ONIGENC_ERR_TOO_BIG_WIDE_CHAR_VALUE;
+}
+
+#if 0
+static int
+utf8_code_to_mbc_first(OnigCodePoint code)
+{
+  if ((code & 0xffffff80) == 0)
+    return code;
+  else {
+    if ((code & 0xfffff800) == 0)
+      return ((code>>6)& 0x1f) | 0xc0;
+    else if ((code & 0xffff0000) == 0)
+      return ((code>>12) & 0x0f) | 0xe0;
+    else if ((code & 0xffe00000) == 0)
+      return ((code>>18) & 0x07) | 0xf0;
+    else if ((code & 0xfc000000) == 0)
+      return ((code>>24) & 0x03) | 0xf8;
+    else if ((code & 0x80000000) == 0)
+      return ((code>>30) & 0x01) | 0xfc;
+    else {
+      return ONIGENC_ERR_TOO_BIG_WIDE_CHAR_VALUE;
+    }
+  }
+}
+#endif
+
+static int
+utf8_code_to_mbc(OnigCodePoint code, UChar *buf, OnigEncoding enc)
+{
+#define UTF8_TRAILS(code, shift) (UChar )((((code) >> (shift)) & 0x3f) | 0x80)
+#define UTF8_TRAIL0(code)        (UChar )(((code) & 0x3f) | 0x80)
+
+  if ((code & 0xffffff80) == 0) {
+    *buf = (UChar )code;
+    return 1;
+  }
+  else {
+    UChar *p = buf;
+
+    if ((code & 0xfffff800) == 0) {
+      *p++ = (UChar )(((code>>6)& 0x1f) | 0xc0);
+    }
+    else if ((code & 0xffff0000) == 0) {
+      *p++ = (UChar )(((code>>12) & 0x0f) | 0xe0);
+      *p++ = UTF8_TRAILS(code, 6);
+    }
+    else if ((code & 0xffe00000) == 0) {
+      *p++ = (UChar )(((code>>18) & 0x07) | 0xf0);
+      *p++ = UTF8_TRAILS(code, 12);
+      *p++ = UTF8_TRAILS(code,  6);
+    }
+    else if ((code & 0xfc000000) == 0) {
+      *p++ = (UChar )(((code>>24) & 0x03) | 0xf8);
+      *p++ = UTF8_TRAILS(code, 18);
+      *p++ = UTF8_TRAILS(code, 12);
+      *p++ = UTF8_TRAILS(code,  6);
+    }
+    else if ((code & 0x80000000) == 0) {
+      *p++ = (UChar )(((code>>30) & 0x01) | 0xfc);
+      *p++ = UTF8_TRAILS(code, 24);
+      *p++ = UTF8_TRAILS(code, 18);
+      *p++ = UTF8_TRAILS(code, 12);
+      *p++ = UTF8_TRAILS(code,  6);
+    }
+#ifdef USE_INVALID_CODE_SCHEME
+    else if (code == INVALID_CODE_FE) {
+      *p = 0xfe;
+      return 1;
+    }
+    else if (code == INVALID_CODE_FF) {
+      *p = 0xff;
+      return 1;
+    }
+#endif
+    else {
+      return ONIGENC_ERR_TOO_BIG_WIDE_CHAR_VALUE;
+    }
+
+    *p++ = UTF8_TRAIL0(code);
+    return p - buf;
+  }
+}
+
+static int
+utf8_mbc_case_fold(OnigCaseFoldType flag, const UChar** pp,
+		   const UChar* end, UChar* fold, OnigEncoding enc)
+{
+  const UChar* p = *pp;
+
+  if (ONIGENC_IS_MBC_ASCII(p)) {
+#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
+    if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
+      if (*p == 0x49) {
+	*fold++ = 0xc4;
+	*fold   = 0xb1;
+	(*pp)++;
+	return 2;
+      }
+    }
+#endif
+
+    *fold = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
+    (*pp)++;
+    return 1; /* return byte length of converted char to lower */
+  }
+  else {
+    return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF8, flag,
+					 pp, end, fold);
+  }
+}
+
+#if 0
+static int
+utf8_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
+{
+  const UChar* p = *pp;
+
+  if (ONIGENC_IS_MBC_ASCII(p)) {
+    (*pp)++;
+    return ONIGENC_IS_ASCII_CODE_CASE_AMBIG(*p);
+  }
+  else {
+    (*pp) += enc_len(ONIG_ENCODING_UTF8, p);
+
+    if (*p == 0xc3) {
+      int c = *(p + 1);
+      if (c >= 0x80) {
+	if (c <= (UChar )0x9e) { /* upper */
+	  if (c == (UChar )0x97) return FALSE;
+	  return TRUE;
+	}
+	else if (c >= (UChar )0xa0 && c <= (UChar )0xbe) { /* lower */
+	  if (c == (UChar )'\267') return FALSE;
+	  return TRUE;
+	}
+        else if (c == (UChar )0x9f &&
+                 (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
+	  return TRUE;
+        }
+      }
+    }
+  }
+
+  return FALSE;
+}
+#endif
+
+
+static int
+utf8_get_ctype_code_range(int ctype, OnigCodePoint *sb_out,
+			  const OnigCodePoint* ranges[], OnigEncoding enc)
+{
+  *sb_out = 0x80;
+  return onigenc_unicode_ctype_code_range(ctype, ranges);
+}
+
+
+static UChar*
+utf8_left_adjust_char_head(const UChar* start, const UChar* s, OnigEncoding enc)
+{
+  const UChar *p;
+
+  if (s <= start) return (UChar* )s;
+  p = s;
+
+  while (!utf8_islead(*p) && p > start) p--;
+  return (UChar* )p;
+}
+
+static int
+utf8_get_case_fold_codes_by_str(OnigCaseFoldType flag,
+    const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[],
+    OnigEncoding enc)
+{
+  return onigenc_unicode_get_case_fold_codes_by_str(ONIG_ENCODING_UTF8,
+						    flag, p, end, items);
+}
+
+OnigEncodingType OnigEncodingUTF8 = {
+  utf8_mbc_enc_len,
+  "UTF-8",     /* name */
+  6,           /* max byte length */
+  1,           /* min byte length */
+  utf8_is_mbc_newline,
+  utf8_mbc_to_code,
+  utf8_code_to_mbclen,
+  utf8_code_to_mbc,
+  utf8_mbc_case_fold,
+  onigenc_unicode_apply_all_case_fold,
+  utf8_get_case_fold_codes_by_str,
+  onigenc_unicode_property_name_to_ctype,
+  onigenc_unicode_is_code_ctype,
+  utf8_get_ctype_code_range,
+  utf8_left_adjust_char_head,
+  onigenc_always_true_is_allowed_reverse_match
+};