MsgBox and InputBox. The following code makes them available in JScript too. Monday, 14 December 2009
MsgBox / InputBox in JScript
Unfortunately JScript does not have several useful features available in VBScript. The most famous things are
Wednesday, 11 November 2009
Tuesday, 3 November 2009
Cross-platform date/time definition
Earlier here (in Russian) i have investigated ways how to obtain date and time parts using the
Recently i found the excelent link (in Russian too) with the description how to obtain the subject platform-independently.
I slightly modified the established method and present it now.
CMD.EXE features. After that here (in Russian too) i have simplified this way until two lines of a code. But both ways are platform-dependent - the order of date parts depends on the locale settings.
Recently i found the excelent link (in Russian too) with the description how to obtain the subject platform-independently.
I slightly modified the established method and present it now.
Thursday, 29 October 2009
CMD/BAT Librarian
Introduction
UnfortunatelyCMD.EXE, the command line interpreter in Windows, does not allows to collect favorite scripts under appropriate folders and use them multiple times in the future. So we have to use the "copy-and-paste" technology to migrate some needed functionalities from one script to another.
The script below allows to store debugged scripts under the determined folder, use them mutiple times, compile and link automatically to the final script.
Logfile rotation by CMD/BAT
The script below allows to rotate file (e.g.: logfiles). By default, the length of rotation is 5. It means that this script rotates some file no more than for 5 times.
Let's consider the permanently growing file of some application named as
The recent records are available from the file
Let's consider the permanently growing file of some application named as
something.log and we'd like to keep records in this file for the long time as much as possible. But for some reason this file is cleaning up periodically or a size of the file affects on the application's performance.
The recent records are available from the file
something.log and the previously saved records are available under the name something.log.1, etc until the something.log.5. After the following rotation the content of the last file will be lost and replaced by the content of the previous file (something.log.4 will be copied to the something.log.5) and the first file something.log will be copied to the something.log.1. At the same time the something.log will be truncated.
rotate something.log 10
Sunday, 4 October 2009
Friday, 2 October 2009
Simple Batch Progress Bar
Example 1. Print the bar within the window with '#' as the default filling character
call :progressbar 50
Example 2. The same as above but with an another filling character
call :progressbar 50 *
Example 3. Print the bar in the window title
set progressbar_t=1 call :progressbar 50
Tuesday, 8 September 2009
CMD/BAT: GetOptions
This is flexible and useful library to manipulate with arguments in CMD/BAT scripts.
Wednesday, 19 August 2009
Substring extraction by CMD
Once i needed to solve the next task. I have a batch script with name corresponding to the following conditions:
- the script filename has to be matched the pattern (see below).
- this script has to be located within directory tree of free nestion but one of directories of the tree has to be macthed the same pattern.
Wednesday, 5 August 2009
Monday, 27 July 2009
URL parsing in Javascript
There is very simple way to parse URL in Javascript. Just define new method in the prototype of the
String. Of course, it has own shortcomings but in the most cases it covers the wide range of URLs and protocols (http(s), ftp, mailto, etc; the mandatory part of URL, host is considered as domain names, IPs, and localhost separately), and moreover it considers the more complex URLs like jdbc:oracle://localhost:1521.
Thursday, 9 July 2009
JS2BAT converter 2
Earlier to embed javascript codes into batch files the
JS2BAT tool has ben implemented with batch features only. In this topic the same tool has been implemented in pure javascript. As opposed to the previous version the present one is the more functional and has optional parmeters.
Previously the js2bat.js script has been implemented in javascript. After that it has been converted to the js2bat.bat batch script by itself with the following command:
cscript js2bat.js js2bat.js
Tuesday, 7 July 2009
JS2BAT converter
This script allows you to embed Javascript codes into the batch-script immediately. So you can stop to worry about creating of an additional batch-wrapper or lost of some specific parameters. Perl distribution has the same functional script
pl2bat but for wrapping of perl-scripts with batch-scripts. I am not author of this idea, i just implemented this feature as the standalone tool.
The main feature is to write the prolog code that is valid both in a batch and javascript. When launching the batch it runs as batch and calls the javascript interpreter with the same file as javascript file. But the second one skips this prolog as valid javascript comments.
Friday, 3 July 2009
Finest code syntax highlighter
Quotation from the Code Syntax Highlighter, the homepage of the project, allowing to embed colorizing of text and fully written on Javascript.
I decided to use it in my blog and found that it works fine. Unfortunately there is no brushes for
SyntaxHighlighter is a fully functional self-contained code syntax highlighter developed in JavaScript.It is really true! It is very useful, very flexible and easy to customize. The main idea is to use so-named brushes to colorize codes within
<pre /> tags (it is defined by default and customizable too!). Colorizing is simple. You have to link scripts and styles to your pages and add brush via class attribute (like this class="brush:js" for colorizing of Javascript codes). I decided to use it in my blog and found that it works fine. Unfortunately there is no brushes for
cmd/bat scripts and i have implemented this embedding to the blog's layout the code from below.
HOWTO turn a character case via CMD/BAT
Introduction
This example is amazing that fact that it can be extended by non-Latins with no pain. Just add your owned translation table at the end of script in the formatUPPER lower. For example, the translation table for Cyrillic characters is following:
А а Б б ... Ю ю Я яJust remember that the capitals have to be the first with following lowercase letters.
Examples of usage
Capitalize all characters. Results toQWERTY.
CAPS qwerty /uThe first character is capital, and others are in lower case. Results to
Qwerty.
CAPS qwerty /ufInvert the result of the previous example. Both result to
qWERTY.
CAPS qwerty /uf /l CAPS qwerty /lf
Sunday, 28 June 2009
Monday, 22 June 2009
Monday, 15 June 2009
WC: Emulation of the unix command
This is curious, joke. It is attempt to emulate the unix-commad wc. Do not consider this as fully featured application. It has essential shortcomings - slower than analogs and it gives great mistakes when counting the number of words. This is related with features of processing of special characters when passing them as arguments.
Validate number arguments within CMD/BAT
@echo off
if "%~1" == "" (
echo EMPTY
goto :EOF
)
if "%~1" == "0" (
echo ZERO
goto :EOF
)
set /a number_var=%~1 2>nul
if errorlevel 2 (
echo ILLEGAL
goto :EOF
)
if %~1 neq %number_var% (
echo ERROR
goto :EOF
)
set number_var
goto :EOF
Saturday, 13 June 2009
Complex numbers with Javascript
Однажды решили попрактиковаться в реализации комплексных чисел средствами Javascript. Вот что из этого получилось. Особенностью модуля является вычисление всех частей (вещественной, мнимой, модуля и аргумента) комплексного числа на момент его создания. Это ни прибавляет, ни отнимает скорости вычислений, но оптимизирует некоторые вычисления (например, при вычислениях в алгебраической или полярной формах). Описаны арифметические операции, основные функции над комплексными числами (возведение в степень, логарифм, степенная функция, экспонента, квадратный корень и вычисление всех корней). Арифметические операции расширены для операций над несколькими числами.
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