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author | Andrew M. Kuchling <amk@amk.ca> | 2000-06-26 23:59:24 (GMT) |
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committer | Andrew M. Kuchling <amk@amk.ca> | 2000-06-26 23:59:24 (GMT) |
commit | f57d7b9e306cb9b9969191cc0cf2be6154227d64 (patch) | |
tree | 15b78b501aca9860e885d583d4c8adaeb6623d3e /Doc/lib/libascii.tex | |
parent | 2b9d0bcf83a9e16563be9b088c2fb58ea015c742 (diff) | |
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Dcoumentation for ascii.py. I've changed two references from ascii to
curses.ascii.
Diffstat (limited to 'Doc/lib/libascii.tex')
-rw-r--r-- | Doc/lib/libascii.tex | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/Doc/lib/libascii.tex b/Doc/lib/libascii.tex new file mode 100644 index 0000000..5159804 --- /dev/null +++ b/Doc/lib/libascii.tex @@ -0,0 +1,131 @@ +\section{\module{curses.ascii} --- + Constants and set-membership functions for ASCII characters.} + +\declaremodule{standard}{curses.ascii} +\modulesynopsis{Constants and set-membership functions for ASCII characters.} +\moduleauthor{Eric S. Raymond}{esr@thyrsus.com} +\sectionauthor{Eric S. Raymond}{esr@thyrsus.com} + +\versionadded{1.6} + +The \module{curses.ascii} module supplies name constants for ASCII characters +and functions to test membership in various ASCII character classes. +The constants supplied are names for control characters as follows: + +NUL, SOH, STX, ETX, EOT, ENQ, ACK, BEL, BS, TAB, HT, LF, NL, VT, FF, CR, +SO, SI, DLE, DC1, DC2, DC3, DC4, NAK, SYN, ETB, CAN, EM, SUB, ESC, FS, +GS, RS, US, SP, DEL. + +NL and LF are synonyms; so are HT and TAB. The module also supplies +the following functions, patterned on those in the standard C library: + +\begin{funcdesc}{isalnum}{c} +Checks for an ASCII alphanumeric character; it is equivalent to +isalpha(c) or isdigit(c)) +\end{funcdesc} + +\begin{funcdesc}{isalpha}{c} +Checks for an ASCII alphabetic character; it is equivalent to +isupper(c) or islower(c)) +\end{funcdesc} + +\begin{funcdesc}{isascii}{c} +Checks for a character value that fits in the 7-bit ASCII set. +\end{funcdesc} + +\begin{funcdesc}{isblank}{c} +Checks for an ASCII alphanumeric character; it is equivalent to +isalpha(c) or isdigit(c)) +\end{funcdesc} + +\begin{funcdesc}{iscntrl}{c} +Checks for an ASCII control character (range 0x00 to 0x1f). +\end{funcdesc} + +\begin{funcdesc}{isdigit}{c} +Checks for an ASCII decimal digit, 0 through 9. +\end{funcdesc} + +\begin{funcdesc}{isgraph}{c} +Checks for ASCII any printable character except space. +\end{funcdesc} + +\begin{funcdesc}{islower}{c} +Checks for an ASCII lower-case character. +\end{funcdesc} + +\begin{funcdesc}{isprint}{c} +Checks for any ASCII printable character including space. +\end{funcdesc} + +\begin{funcdesc}{ispunct}{c} +Checks for any printable ASCII character which is not a space or an +alphanumeric character. +\end{funcdesc} + +\begin{funcdesc}{isspace}{c} +Checks for ASCII white-space characters; space, tab, line feed, +carriage return, form feed, horizontal tab, vertical tab. +\end{funcdesc} + +\begin{funcdesc}{isupper}{c} +Checks for an ASCII uppercase letter. +\end{funcdesc} + +\begin{funcdesc}{isxdigit}{c} +Checks for an ASCII hexadecimal digit, i.e. one of 0123456789abcdefABCDEF. +\end{funcdesc} + +\begin{funcdesc}{isctrl}{c} +Checks for an ASCII control character, bit values 0 to 31. +\end{funcdesc} + +\begin{funcdesc}{ismeta}{c} +Checks for a (non-ASCII) character, bit values 0x80 and above. +\end{funcdesc} + +These functions accept either integers or strings; when the argument +is a string, it is first converted using the built-in function ord(). + +Note that all these functions check ordinal bit values derived from the +first character of the string you pass in; they do not actually know +anything about the host machine's character encoding. For functions +that know about the character encoding (and handle +internationalization properly) see the string module. + +The following two functions take either a single-character string or +integer byte value; they return a value of the same type. + +\begin{funcdesc}{ascii}{c} +Return the ASCII value corresponding to the low 7 bits of c. +\end{funcdesc} + +\begin{funcdesc}{ctrl}{c} +Return the control character corresponding to the given character +(the character bit value is logical-anded with 0x1f). +\end{funcdesc} + +\begin{funcdesc}{alt}{c} +Return the 8-bit character corresponding to the given ASCII character +(the character bit value is logical-ored with 0x80). +\end{funcdesc} + +The following function takes either a single-character string or +integer byte value; it returns a string. + +\begin{funcdesc}{unctrl}{c} +Return a string representation of the ASCII character c. If c is +printable, this string is the character itself. If the character +is a control character (0x00-0x1f) the string consists of a caret +(^) followed by the corresponding uppercase letter. If the character +is an ASCII delete (0x7f) the string is "^?". If the character has +its meta bit (0x80) set, the meta bit is stripped, the preceding rules +applied, and "!" prepended to the result. +\end{funcdesc} + +Finally, the module supplies a 33-element string array +called controlnames that contains the ASCII mnemonics for the +thirty-two ASCII control characters from 0 (NUL) to 0x1f (US), +in order, plus the mnemonic "SP" for space. + + |