Bodo,
The STAF colon-length-colon format is for an entire option value in a STAF
service request (as talked about in the STAF User's Guide).
You need to understand Python to know what characters in a string like
this need to be replaced. This isn't really a STAF/STAX question, but
more of a Python question on how to construct string literals. Please
read section "Using Python for Expression Evaluation" in the STAX User's
Guide and you can google for more information on Python.
For example, say you wanted to run the following command via a <process>
element in a STAX job:
myCommand -file: "C:\Program Files\myApp" -x: 'Hi'
you could specify:
<parms>"-file: \"C:\\Program Files\\myApp\" -x: 'Hi'"</parms>
or you could specify it as follows:
<parms>'-file: "C:\\Program Files\\myApp" -x: \'Hi\''</parms>
Python documentation provides complete information about how to construct
string literals such as the following information:
"There are several different ways to construct string literals in Python.
String literals can start and end with single quotes or double quotes. In
either case, the other kind of quote can be used safely inside the
literal. Within the quotation marks, special characaters are escaped
using a backslash. The list of escapes is based on C and is slightly
different from Java's escape list. Unlike Java, backslashes followed by
characters not on the following list of escapes are legal in strings, and
are treated merely as normal characters.
Backslash Escape Characters:
Escape character Meaning
---------------- -----------------------------------------
\\ Backslash (\)
\' Single quote (')
\" Double quote (")
\r Carriage return
\t Tab
\uxxxx Unicode 16-bit character value xxxx (hex)
\a Bell (ASCII character number 13)
\b Backspace
\f Formfeed
\n Linefeed or newline
\N{name} Unicode character identified by "name"
\Uxxxxxxxx Unicode 32-bit characer xxxxxxxx (hex)
\v Vertical tab character
\ooo Unicode 8-bit character in octal
\xhh hexadecimal
String literals may also begin and end with either three single or three
double quotes. A triple-quoted string may include newline characters
(which would ordinarily need to be escaped) or individual quotation marks.
"""some
long
string"""
A string literal may also have an r or R before the inital quote, to
indicate a "raw string". Inside a raw string, backslash escape does not
work and backslashes are treated as normal characters. Quotation marks
may be escaped in raw strings, but the backslash stays in the string.
>>> r"c:\program files"
'c:\\program files'
>>> r"\""
'\\"'
Notice that the raw string results in a normal string -- after the string
is created, you can't tell whether itwas created using the raw option. Raw
strings are just a flavor or string literal. They are often used in
regular expressions to keep them from looking even more like random
noise."
So, in the future, you can look at Python documentation to get answers to
questions on Python (instead of posting to the staf-users mailing list).
Note, you also need to be careful when specifying a < or & within a STAX
xml file, or a { in a STAF service request option value that resolves
variables:
- Also, note that XML processors assume that < always starts a tag and
that & always starts an entity reference, so you should avoid using those
characters for anything else. You must use the entity reference <
instead of < and entity reference & instead of & or else you'll get an
XML parsing error.
- Also, note that STAF automatically resolves STAF variables in a PROCESS
START COMMAND and PARMS option, so if you need to specify a {, you need to
escape it with a caret, e.g. ^{
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/10/2009 03:10 PM
To
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
cc
Subject
[staf-users] STAX: How to format <parms> element content
Hi,
when starting a <process> in STAX, parameters for the process must be
specified in the <parms> element.
I need to handle the case of a number of strings containing one parameter
each.
The strings might contain characters like Quotation marks, Single quotes
or
Backslashes. How would I need to prepare the python string for the <parms>
element, so that the parameters are transfered to the process
transparently?
The colon-length-colon method seems not to work here.
Best regards
Bodo
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