My Tech Notes: develop

Showing posts with label develop. Show all posts

Java: check if a String contains only ASCII

import java.nio.charset.Charset;

public boolean isAscii(String v) {
    Charset.forName("US-ASCII").newEncoder().canEncode(v);
}

Eclipse: Disable auto escaping when pasting

In the preferences menu deselect: Java > Editor > Typing > Escape text when pasting into a string literal
Disable smart insert mode: Edit > Smart Insert Mode [Ctrl+Shift+Insert]

Java: remove unsafe html tags


public class HtmlTagRemover {
    public static String removeUnsafeTags(String html) {
        // Define the regular expression pattern to match unsafe tags
        String unsafeTagsPattern = "<(script|iframe|object|embed)[^>]*>.*?</\\1>";

        // Remove the unsafe tags from the HTML string
        String safeHtml = html.replaceAll(unsafeTagsPattern, "");

        return safeHtml;
    }

    public static void main(String[] args) {
        String html = "<b>Safe HTML</b><script>alert('XSS')</script>";
        String safeHtml = removeUnsafeTags(html);
        System.out.println(safeHtml);
    }
}

Regular Expression Capture Groups

Capture groups:


use regex::Regex;

let re = Regex::new(r"(\w+)").unwrap();
let text = "Hello world";

for cap in re.captures_iter(text) {
    println!("Match: {}", &cap[1]);
}

Named capture groups:


use regex::Regex;

let re = Regex::new(r"(?<word>\w+)").unwrap();
let text = "Hello world";

for cap in re.captures_iter(text) {
    println!("Match: {}", &cap["word"]);
}

Enable code syntax highlighting in blogger site using highlightjs

Template -> Edit HTML

Insert the following inside <head> tag:

    
    <!-- BEGIN: Syntax Highlighting with highlight.js -->
    <link crossorigin='anonymous' href='https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/agate.min.css' integrity='sha512-wI7oXtzNHj/bqfLA3P6x3XYbcwzsnIKaPLfjjX8ZAXhc65+kSI6sh8gLOOByOKImokAjHUQR0xAJQ/xZTzwuOA==' referrerpolicy='no-referrer' rel='stylesheet'/>
    <script crossorigin='anonymous' integrity='sha512-bgHRAiTjGrzHzLyKOnpFvaEpGzJet3z4tZnXGjpsCcqOnAH6VGUx9frc5bcIhKTVLEiCO6vEhNAgx5jtLUYrfA==' referrerpolicy='no-referrer' src='https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/highlight.min.js'/>
    <script>hljs.highlightAll();</script>
    <!-- END: Syntax Highlighting with highlight.js -->
    <!-- BEGIN: CSS for code in pre and code -->
    <style type='text/css'>
        pre {
            font-family: monospace;
            font-size: 1 em;
            background: #333;
            color: #33cc33;
            tab-size: 4;
            padding: 5px;
            border: 1px dotted grey;
            border-radius: 5px;
            line-height: 2.0;
            overflow-x: auto;
            white-space: pre-wrap;
        }

        code {
            white-space: pre-wrap;
            overflow-x: scroll;    
            font-family: monospace;
            font-size: 1em;
        }
    </style>
    <!-- END: CSS for code in pre and code -->

Click save icon to save the template

Use it in your blog post:

<pre><code class="language-html">...</code></pre>

Setup Neovim for Rust Development

Install Neovim
Install AstroNvim
- After installed AstroNvim, you can customise it
Install rust LSP
In Neovim, execute command:
```
:LspInstall rust
```
Install rust language parser (tree-sitter)
In Neovim, execute command:
```
:TSInstall rust
```
Install lua language parser (tree-sitter)
In Neovim, execute command:
```
:TSInstall lua
```
This is useful for editting the Neovim config (lua) files (*.lua)

Migrate git repository to GitLab using the command line

Create a new EMPTY repository in GitLab. (Note: You MUST uncheck "Initialize repository with README")
Clone from the source remote repository (from e.g. BitBucket, Github):
```
git clone --mirror git@bitbucket.org:path/to/REPO.git
```

Push the local repository to GitLab:

cd REPO.git
git push --mirror git@gitlab.com:path/to/REPO.git

Set Groovy Development Environment

I. Install required SDK and IDE

Install Java SDK 8+
Install Gradle
Install Groovy
Install Intellij Idea

II. Create a new Groovy project using Gradle

Create a new project directory:
```
mkdir my-groovy-app
```

Get into the project directory

cd my-groovy-app

and run gradle:

gradle init
Select type of project to generate:
  1: basic
  2: application
  3: library
  4: Gradle plugin
Enter selection (default: basic) [1..4] 1

Select build script DSL:
  1: Groovy
  2: Kotlin
Enter selection (default: Groovy) [1..2] 1

Generate build using new APIs and behavior (some features may change in the next minor release)? (default: no) [yes, no]
Project name (default: my-groovy-app):

> Task :init
Get more help with your project: Learn more about Gradle by exploring our samples at https://docs.gradle.org/7.6/samples

BUILD SUCCESSFUL in 22s
2 actionable tasks: 2 executed

Edit build.gradle file and add the content (like below):

plugins {
    id 'groovy'
    id 'application'
}

group 'myapps'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
    maven {
        url 'https://my.org/mvn-repo'
    }
}

dependencies {
    implementation 'org.apache.groovy:groovy:4.0.7'
    implementation 'org.apache.ivy:ivy:2.5.0'

    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
}

application {
	mainClass = 'my.App'
}

test {
    useJUnitPlatform()
}

Create source folder structure:

mkdir src/main/groovy
mkdir src/main/java
mkdir src/main/resources
mkdir src/test/groovy
mkdir src/test/java
mkdir src/test/resources

Optional: create gradle.properties file at the project root, and add the options below:
```
org.gradle.warning.mode=all
org.gradle.logging.stacktrace=full
```

Create Application class: my.App.groovy:

package my

class App {
    static void main(String[] args) {
    	println 'Hello, Wolrd'
    }
}

Start Intellij Idea, open the project directory. Select src/main/groovy directory, Mark directory as -> Sources root

Java source code: implementation of ANT path pattern

Java source code of org.springframework.util.AntPathMatcher

Typescript optional function


function test(msg: string, func?: (m: string)=>void) {
	func?.(a, b);
}

test('nothing');

test('something', (m)=>console.log(m));

Typescript array elements map to objects

interface Person { name: string; email?: string }

array.map(val => <Person> {
  name:  val.key1,
  email: val.key2
});

Python code to detect file name encoding

File name encoding on Linux

Linux File Name Encoding

check LANG environment variable
- echo $LANG
See also
- How to tell the language encoding
- Encoding of file names in Java

iocharset option of mount

iocharset=value
Character set to use for converting between 8 bit characters and 16 bit Unicode characters. 
The default is iso8859-1. Long filenames are stored on disk in Unicode format.

See also
- https://linux.die.net/man/8/mount

convmv - converts filenames from one encoding to another

https://linux.die.net/man/1/convmv

My Tech Notes

Search This Blog

Java: check if a String contains only ASCII

Eclipse: Disable auto escaping when pasting

Java: remove unsafe html tags

Regular Expression Capture Groups

Enable code syntax highlighting in blogger site using highlightjs

See also

Setup Neovim for Rust Development

See also

Migrate git repository to GitLab using the command line

see also

Set Groovy Development Environment

I. Install required SDK and IDE

II. Create a new Groovy project using Gradle

Java source code: implementation of ANT path pattern

see also

Typescript optional function

Typescript array elements map to objects

Python code to detect file name encoding

File name encoding on Linux

Linux File Name Encoding

iocharset option of mount

convmv - converts filenames from one encoding to another

See also

Good fonts for programming

Javascript: multiline string

Javascript: remove trailing zeros returned by toFixed()

See also

MUI DataGrid: manage visible rows after filtering

see also

Javascript: sort string array alphabetically

see also

Javascript: remove duplicated values from array

Get distinct values from Array

Get distinct values from Map

see also

Count code lines with cloc

see alos