🧠 Compiler Construction Project (C# Windows Forms)

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📌 Overview

This project is a custom-built compiler simulation implemented using C# Windows Forms. It parses and evaluates a custom-designed scripting language that supports variables, conditional logic, loops, arrays, and I/O operations.

The compiler scans input code, validates it using Regular Expressions (Regex), and simulates the compilation process with basic syntax analysis, semantic checks, symbol table generation, and intermediate interpretation.

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🛠️ Features

• 🧾 Lexical Analysis using Regex.
• 📄 Syntax Analysis with grammar-based validation.
• 📚 Symbol Table management with scope support.
• 💡 Conditional Logic: is, elis, el constructs (similar to if-else).
• 🔁 Looping using a loop(...) construct.
• 📦 Array Declaration with basic initialization.
• 🖨️ Display Statements (string, variable, expressions).
• ⌨️ Input Statements.
• ➕ Arithmetic Expressions: supports +, -, *, / operators.
• 🧮 Expression Evaluation.
• 🧪 Switch-Case-like structure using option(), opt, def.

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🧪 Sample Code Inputs

Here are some supported code patterns:

num $a = 10, $y;
display < $a;
{
    num $x = 7;
    display < $x;
    $y = 50;
}
display < $y;

num $a = 2;
num $b = 5;
is($a > $b){
    display < 'a is greater';
}
elis($a < $b){
    display < 'a is less';
}
el{
    display < 'a is equal to b';
}

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🧰 Technology Stack

Component	Technology
Language	C#
UI Framework	Windows Forms
Logic Handling	Regex, C# Classes
IDE	Visual Studio

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🧩 Supported Syntax

✅ Declarations

num $x;
flo $y;
chr $z;
str $name;

✅ Initialization

$x = 5;
$name = "John";

✅ Declaration + Initialization

num $a = 10;
flo $rate = 3.14;
chr $grade = 'A';

✅ Multiple Declarations / Initializations

num $x = 5, $y, $z;
flo $a, $b;

✅ Arithmetic Expressions

$a = 5 + 3;
$x = $y * 2 - 1;

✅ Display Statements

display < 'Hello World';
display < $x;
display < 'Value: ' + $x;

✅ Input Statements

in > $name;

✅ Conditional Statements

is($x > $y){
    ...
}
elis($x == $y){
    ...
}
el{
    ...
}

✅ Looping

loop(num $i = 0; $i < 10; $i + 1){
    display < $i;
}

✅ Arrays

num $arr = new num[1, 2, 3, 4];

✅ Option Block (Switch-Case)

option($choice){
    opt 1:
        display < 'One';
    opt 2:
        display < 'Two';
    def:
        display < 'Default';
}

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🗂️ Project Structure

CompilerProject/
├── MainForm.cs        # Main UI logic with Regex-based parsing
├── SymbolTable.cs     # Class to store variable name, type, and value
├── ScopeSymbolTable.cs# For nested block-level scoping
├── Program.cs         # App entry point
├── CC_project1.sln
└── README.md

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🧪 Symbol Table Design

Name	Type	Value	Scope
$a	num	10	global
$x	num	7	local

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💡 Implementation Highlights

• Modular Regex Rules:

  • Different patterns for declaration, initialization, arithmetic, loops, and conditionals.

• Queue-based Execution:

  • Instructions are parsed and added to a queue for simulation.

• Block Management:

  • Scope-sensitive parsing for nested code blocks.

• Extensible Design:

  • Easily add support for new types and language constructs.

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🔄 How to Run

1. Clone or download the project.
2. Open in Visual Studio.
3. Restore NuGet packages if required.
4. Press Start (F5) to run the Windows Form app.
5. Paste example code in the txtInput textbox.
6. Press the Compile or Run button (ensure you have that button wired to parsing logic).

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📈 Future Enhancements

• ✅ Add error highlighting and messages.
• ✅ GUI improvements with syntax highlighting.
• ⏳ AST (Abstract Syntax Tree) generation.
• ⏳ Intermediate Code Generation (ICG).
• ⏳ Basic optimization strategies.
• ⏳ Function support and recursion.
• ⏳ Export symbol table to file.

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👨‍🏫 Educational Value

This project was created as part of a Compiler Construction course to simulate the fundamental concepts of:

• Lexical & Syntactic analysis
• Context-free grammar validation
• Symbol tables and scoping
• Expression evaluation and control flow

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📄 License

This project is for educational and academic use only. All rights reserved © 2025.

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🙋 Contact

For questions or suggestions, feel free to contact the developer:

Name: Shafia Manzoor LinkedIn: linkedin.com/in/yourprofile