import re
 
# Token specification
token_specification = [
    ('KEYWORD',    r'\b(if|else|while|int|float|return)\b'),
    ('IDENTIFIER', r'\b[a-zA-Z_][a-zA-Z0-9_]*\b'),
    ('NUMBER',     r'\b\d+(\.\d+)?\b'),
    ('OPERATOR',   r'[+\-*/=]'),
    ('SEPARATOR',  r'[(),;]'),
    ('WHITESPACE', r'\s+'),
    ('MISMATCH',   r'.')
]
 
# Compile regex
token_regex = '|'.join(f'(?P<{name}>{pattern})' for name, pattern in token_specification)
 
def lexical_analyzer(code):
    tokens = []
    for match in re.finditer(token_regex, code):
        token_type = match.lastgroup
        token_value = match.group()
 
        if token_type == 'WHITESPACE':
            continue
        elif token_type == 'MISMATCH':
            raise RuntimeError(f'Unexpected character: {token_value}')
        else:
            tokens.append((token_type, token_value))
    return tokens
 
# Example input
source_code = "int sum = a + 10;"
 
# Run lexer
result = lexical_analyzer(source_code)
 
# Print tokens
for token in result:
    print(token)
 

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