LiteCode

This Android code editor now includes comprehensive syntax highlighting for Java, Kotlin,C, C++ and Python programming languages.

Features

Syntax Highlighting

• Java (.java files): Full syntax highlighting with keywords, types, modifiers, comments, and strings
• Kotlin (.kt files): Complete syntax highlighting with Kotlin-specific keywords and features
• Python (.py files): Enhanced syntax highlighting (existing functionality improved)
• C (.c files) and C++(.cpp files): Accurate syntax highlighting for procedural and object-oriented constructs
• Automatic detection: File type detection based on file extension

Supported Language Elements

Java

• Keywords: public, private, protected, static, final, abstract, class, interface, extends, implements, etc.
• Types: String, Integer, Double, List, ArrayList, Map, HashMap, etc.
• Modifiers: public, private, protected, static, final, abstract, etc.
• Comments: Single-line (//) and multi-line (/* */)
• Strings: Double quotes (") and single quotes (')

Kotlin

• Keywords: fun, val, var, class, data, object, companion, suspend, inline, etc.
• Types: String, Int, Double, List, MutableList, Map, MutableMap, etc.
• Modifiers: public, private, internal, open, final, sealed, data, etc.
• Comments: Single-line (//) and multi-line (/* */)
• Strings: Double quotes ("), single quotes ('), and triple quotes (""")

Python

• Keywords: def, class, if, else, for, while, try, except, etc.
• Types: str, int, float, bool, list, tuple, dict, set, etc.
• Modifiers: async, await, staticmethod, classmethod, etc.
• Comments: Hash symbol (#)
• Strings: Single quotes ('), double quotes ("), and triple quotes (""")

C

• Keywords: 'int', 'char', 'float', 'double', 'if', 'else', 'for', 'while', 'return', 'void', 'struct', 'typedef', etc.
• Types: int, char, float, double, long, short, unsigned, etc.
• Modifiers: const, volatile, static, extern, register
• Comments: Single-line (//) and multi-line (/* */)
• Strings: Double quotes (") and character literals (')

C++

• Keywords: All C keywords plus class, namespace, template, public, private, protected, virtual, new, delete, try, catch, throw, etc.
• Types: int, float, double, bool, string, vector, map, unordered_map, etc.
• Modifiers : const, static, mutable, inline, virtual, explicit, etc.
• Comments: Same as C
• Strings: Same as C, plus support for std::string and raw string literals (R"(text)")

How It Works

File Type Detection

The editor automatically detects file types based on file extensions:

• .java → Java syntax highlighting
• .kt → Kotlin syntax highlighting
• .py → Python syntax highlighting
• '.c' → C syntax highlighting
• '.cpp' → C++ syntax highlighting
• Default fallback → Python syntax highlighting

Syntax Highlighting Engine

The SyntaxHighlighter class processes text and applies appropriate colors:

• Comments: Green (dark mode: lighter green)
• Strings: Red (dark mode: orange)
• Keywords: Blue and bold (dark mode: blue)
• Types: Teal and bold (dark mode: lighter teal)
• Modifiers: Navy and bold (dark mode: yellow)

Color Schemes

• Light Mode: Traditional IDE colors
• Dark Mode: VS Code-inspired dark theme colors

Usage

1. Create a new file with .java, .kt, or .py extension
2. Open an existing file - syntax highlighting will be automatically applied
3. Switch between light and dark modes using the theme toggle in the drawer

Technical Implementation

Files Modified/Created

• SyntaxRules.kt - Enhanced data class with types and modifiers
• SyntaxHighlighter.kt - New syntax highlighting engine
• MainActivity.kt - Updated to use file type detection
• java.json - Java syntax rules
• kotlin.json - Kotlin syntax rules
• python.json - Enhanced Python syntax rules
• 'c.json' – C syntax rules
• 'cpp.json' – C++ syntax rules

Key Components

• SyntaxRules: Data class containing language-specific rules
• SyntaxHighlighter: Core highlighting logic with regex-based pattern matching
• File Type Detection: Automatic syntax rule loading based on file extension
• Real-time Highlighting: Syntax highlighting updates as you type

Sample Files

Sample code files are included in the assets folder:

• sample.java - Java example with various syntax elements
• sample.kt - Kotlin example with modern language features
• sample.py - Python example with comprehensive language features
• sample.c – Demonstrates C syntax: functions, structs, loops
• sample.cpp – Demonstrates C++ syntax: classes, templates, exception handling

Notes

• Syntax highlighting is applied in real-time as you type
• The editor maintains all existing functionality (file management, compilation, etc.)
• Only syntax highlighting has been enhanced - no other features were modified
• Performance optimized with efficient regex patterns and caching