133 lines
2.8 KiB
Python
133 lines
2.8 KiB
Python
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#!/bin/env python3
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import argparse
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import datetime
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import ply.lex as lex
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reserved = {
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'var': 'VAR',
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'is': 'IS',
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'unless': 'UNLESS',
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'otherwise': 'OTHERWISE',
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'until': 'UNTIL',
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'do': 'DO',
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'done': 'DONE',
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'procedure': 'PROCEDURE',
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'function': 'FUNCTION',
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'return': 'RETURN',
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'print': 'PRINT',
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'end': 'END',
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}
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tokens = [
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'LPAREN',
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'RPAREN',
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'LSQUARE',
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'RSQUARE',
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'LCURLY',
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'RCURLY',
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'APOSTROPHE',
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'AMPERSAND',
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'COMMA',
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'DOT',
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'EQ',
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'LT',
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'PLUS',
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'MINUS',
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'MULT',
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'DIV',
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'STRING',
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'DATE_LITERAL',
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'INT_LITERAL',
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'IDENT',
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'FUNC_IDENT',
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'PROC_IDENT',
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] + list(reserved.values())
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def t_whitespace(t):
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r'[ \t\n]+'
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t.lexer.lineno += t.value.count('\n')
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def t_comment(t):
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r'\(%(.|\n)*?%\)'
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t.lexer.lineno += t.value.count('\n')
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t_LPAREN = r'\('
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t_RPAREN = r'\)'
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t_LSQUARE = r'\['
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t_RSQUARE = r'\]'
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t_LCURLY = r'\{'
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t_RCURLY = r'\}'
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t_APOSTROPHE = r'\''
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t_AMPERSAND = r'&'
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t_COMMA = r','
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t_DOT = r'\.'
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t_EQ = r'='
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t_LT = r'<'
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t_PLUS = r'\+'
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t_MINUS = r'-'
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t_MULT = r'\*'
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t_DIV = r'/'
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def t_STRING(t):
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r'".*?"'
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t.value = t.value[1:-1]
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return t
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def t_DATE_LITERAL(t):
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r'\d{4}-\d{2}-\d{2}'
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try:
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t.value = datetime.date.fromisoformat(t.value)
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except:
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print(f'Invalid date \'{t.value}\' at line {t.lexer.lineno}')
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raise SystemExit
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return t
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def t_INT_LITERAL(t):
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r'-?\d{1,3}(\'\d{3})*'
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t.value = int(t.value.replace('\'', ''))
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return t
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def t_IDENT(t):
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r'[a-z][a-zA-Z0-9_]+'
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t.type = reserved.get(t.value, 'IDENT')
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return t
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def t_FUNC_IDENT(t):
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r'[A-Z][a-z0-9_]+'
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return t
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def t_PROC_IDENT(t):
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r'[A-Z]{2}[A-Z0-9_]*'
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return t
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def t_error(t):
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print(f'Illegal character \'{t.value[0]}\' at line {t.lexer.lineno}')
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raise SystemExit
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lexer = lex.lex()
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def tokenize_file(file_path: str):
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with open(file_path, 'r', encoding='utf-8') as file:
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lexer.input(file.read())
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tok = lexer.token()
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while tok:
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print(tok)
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tok = lexer.token()
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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group = parser.add_mutually_exclusive_group(required=True)
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group.add_argument('--who', action='store_true', help='print out student IDs and NAMEs of authors')
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group.add_argument('-f', '--file', help='filename to process')
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args = parser.parse_args()
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if args.who:
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print('Author')
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print(' Student ID: 150189237')
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print(' Name: Oskari Alaranta')
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else:
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tokenize_file(args.file)
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