4:20 p.m.
User: aidan
Date: 05/03/26 17:20:05
Modified: xemacs/man/lispref mule.texi
Log:
Cleanup of the CCL coding system example, based on Stephen's feedback.
Revision Changes Path
1.297 +9 -0 XEmacs/xemacs/man/ChangeLog
Index: ChangeLog
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/man/ChangeLog,v
retrieving revision 1.296
retrieving revision 1.297
diff -u -p -r1.296 -r1.297
--- ChangeLog 2005/03/24 12:17:56 1.296
+++ ChangeLog 2005/03/26 16:20:01 1.297
＠＠ -1,3 +1,12 ＠＠
+2005-03-26 Aidan Kehoe <kehoea(a)parhasard.net>
+
+ * lispref/mule.texi (CCL Example):
+ char-int -> char-to-int, and hex 41 is decimal 64, both problems
+ with my previous patch pointed out by Stephen.
+ * lispref/mule.texi (The actual coding system):
+ Give information on the make-coding-system call, and where the
+ actual package can be found.
+
2005-03-24 Aidan Kehoe <kehoea(a)parhasard.net>
* xemacs/custom.texi (X Resources):
1.13 +41 -11 XEmacs/xemacs/man/lispref/mule.texi
Index: mule.texi
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/man/lispref/mule.texi,v
retrieving revision 1.12
retrieving revision 1.13
diff -u -p -r1.12 -r1.13
--- mule.texi 2005/03/09 05:36:50 1.12
+++ mule.texi 2005/03/26 16:20:05 1.13
＠＠ -2097,7 +2097,7 ＠＠ initialized as constants.
* Characters to be preserved:: No transformation needed for these characters.
* The program to decode to internal format:: .
* The program to encode from internal format:: .
-
+* The actual coding system:: .
＠end menu
＠node Four bits to ASCII, URI Encoding constants, , CCL Example
＠＠ -2117,7 +2117,7 ＠＠ after this file is loaded gives the ASCI
(let ((val (make-vector 256 0))
(i 0))
(while (< i (length val))
- (aset val i (char-int (aref (format "%02X" i) 0)))
+ (aset val i (char-to-int (aref (format "%02X" i) 0)))
(setq i (1+ i)))
val)
"Table to find an ASCII version of an octet's most significant 4
bits.")
＠＠ -2125,7 +2125,7 ＠＠ after this file is loaded gives the ASCI
The next table, ＠code{url-coding-low-order-nybble-as-ascii} is almost
the same thing, but this time it has a map for the hex encoding of the
-low-order four bits. So the sixty-fifth entry (offset ＠samp{#x51}) is
+low-order four bits. So the sixty-fifth entry (offset ＠samp{#x41}) is
the ASCII encoding of `1', the hundred-and-twenty-second (offset
＠samp{#x7a}) is the ASCII encoding of `A'.
＠＠ -2134,7 +2134,7 ＠＠ the ASCII encoding of `1', the hundred-a
(let ((val (make-vector 256 0))
(i 0))
(while (< i (length val))
- (aset val i (char-int (aref (format "%02X" i) 1)))
+ (aset val i (char-to-int (aref (format "%02X" i) 1)))
(setq i (1+ i)))
val)
"Table to find an ASCII version of an octet's least significant 4
bits.")
＠＠ -2154,14 +2154,14 ＠＠ the space character. When doing this in
＠code{url-coding-escaped-space-code} variable.
＠example
-(defvar url-coding-escape-character-code (char-int ?%)
+(defvar url-coding-escape-character-code (char-to-int ?%)
"The code point for the percentage sign, in ASCII.")
-(defvar url-coding-escaped-space-code (char-int ?+)
+(defvar url-coding-escaped-space-code (char-to-int ?+)
"The URL-encoded value of the space character, that is, +.")
＠end example
-＠node Numeric to ASCII-hexadecimal conversion
+＠node Numeric to ASCII-hexadecimal conversion, Characters to be preserved, URI Encoding
constants, CCL Example
＠subsubsection Numeric to ASCII-hexadecimal conversion
Now, we have a couple of utility tables that wouldn't be necessary in
＠＠ -2177,7 +2177,7 ＠＠ a few examples.)
(let ((i 0)
(val (make-vector 16 0)))
(while (< i 16)
- (aset val i (char-int (aref (format "%X" i) 0)))
+ (aset val i (char-to-int (aref (format "%X" i) 0)))
(setq i (1+ i)))
val)
"A map from a hexadecimal digit's numeric value to its encoding in
ASCII.")
＠＠ -2193,7 +2193,7 ＠＠ a few examples.)
"A map from Latin 1 code points to their values as hexadecimal digits.")
＠end example
-＠node Characters to be preserved
+＠node Characters to be preserved, The program to decode to internal format, Numeric to
ASCII-hexadecimal conversion, CCL Example
＠subsubsection Characters to be preserved
And finally, the last of these tables. URL encoding says that
＠＠ -2227,7 +2227,7 ＠＠ every nanosecond counts.
octet as its ASCII encoding.")
＠end example
-＠node The program to decode to internal format
+＠node The program to decode to internal format, The program to encode from internal
format, Characters to be preserved, CCL Example
＠subsubsection The program to decode to internal format
After the almost interminable tables, we get to the CCL. The first
＠＠ -2288,7 +2288,7 ＠＠ buffer, and move to the next iteration o
internal encoding. ")
＠end example
-＠node The program to encode from internal format
+＠node The program to encode from internal format, The actual coding system, The program
to decode to internal format, CCL Example
＠subsubsection The program to encode from internal format
Next, we see the CCL program to encode ASCII text as URL coded text.
＠＠ -2323,6 +2323,36 ＠＠ We then read an octet from the input int
(repeat))))
"CCL program to encode octets (almost) according to RFC 1738")
＠end example
+
+＠node The actual coding system, , The program to encode from internal format, CCL
Example
+＠subsubsection The actual coding system
+
+To actually create the coding system, we call
+＠samp{make-coding-system}. The first argument is the symbol that is to
+be the name of the coding system, in our case ＠samp{url-coding}. The
+second specifies that the coding system is to be of type
+＠samp{ccl}---there are several other coding system types available,
+including, see the documentation for ＠samp{make-coding-system} for the
+full list. Then there's a documentation string describing the wherefore
+and caveats of the coding system, and the final argument is a property
+list giving information about the CCL programs and the coding system's
+mnemonic.
+
+＠example
+(make-coding-system
+ 'url-coding 'ccl
+ "The coding used by application/x-www-form-urlencoded HTTP applications.
+This coding form doesn't specify anything about non-ASCII characters, so
+make sure you've transformed to a seven-bit coding system first."
+ '(decode ccl-decode-urlcoding
+ encode ccl-encode-urlcoding
+ mnemonic "URLenc"))
+＠end example
+
+If you're lucky, the ＠samp{url-coding} coding system describe here
+should be available in the XEmacs package system. Otherwise, downloading
+it from ＠samp{http://www.parhasard.net/url-coding.el} should work for
+the foreseeable future.
＠node Category Tables, Unicode Support, CCL, MULE
＠section Category Tables