app.py

from flask import Flask, request, jsonify
import re

app = Flask(__name__, static_folder='.', static_url_path='')

def lexical_analyzer(code):
    tokens = []
    patterns = [
        (r'\b(int|float|if|else|while|for)\b', 'keyword'),
        (r'\b[a-zA-Z][a-zA-Z0-9_]*\b', 'identifier'),
        (r'\d+\.\d*|\d+', 'number'),  # Match floats and integers
        (r'==', 'operator'),  # Match ==
        (r'\|\|', 'operator'),  # Match ||
        (r'[+\-*/=<]', 'operator'),
        (r'[;{}]', 'delimiter'),
        (r'[\(\)]', 'parenthesis'),
        (r'\s+', None),  # Skip whitespace
        (r'.', 'error')  # Catch-all for invalid chars
    ]
    
    pos = 0
    while pos < len(code):
        match = None
        for pattern, token_type in patterns:
            regex = re.compile(pattern)
            match = regex.match(code, pos)
            if match:
                if token_type:
                    tokens.append({"token": match.group(0), "type": token_type})
                pos = match.end()
                break
        if not match:
            tokens.append({"token": code[pos], "type": "error"})
            pos += 1
    return tokens

@app.route('/')
def serve_index():
    return app.send_static_file('index.html')

@app.route('/analyze', methods=['POST'])
def analyze():
    try:
        data = request.get_json()
        code = data.get('code', '')
        if not code:
            return jsonify([])
        tokens = lexical_analyzer(code)
        return jsonify(tokens)
    except Exception as e:
        print(f"Error in /analyze: {e}")
        return jsonify([{"token": "Server Error", "type": "error"}]), 500

if __name__ == '__main__':
    app.run(debug=True)