Created
April 10, 2015 18:16
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tokenizing text
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# example.py | |
# | |
# Example of a tokenizer | |
import re | |
from collections import namedtuple | |
NAME = r'(?P<NAME>[a-zA-Z_][a-zA-Z_0-9]*)' | |
NUM = r'(?P<NUM>\d+)' | |
PLUS = r'(?P<PLUS>\+)' | |
TIMES = r'(?P<TIMES>\*)' | |
EQ = r'(?P<EQ>=)' | |
WS = r'(?P<WS>\s+)' | |
master_pat = re.compile('|'.join([NAME, NUM, PLUS, TIMES, EQ, WS])) | |
Token = namedtuple('Token', ['type','value']) | |
def generate_tokens(pat, text): | |
scanner = pat.scanner(text) | |
for m in iter(scanner.match, None): | |
yield Token(m.lastgroup, m.group()) | |
for tok in generate_tokens(master_pat, 'foo = 42'): | |
print(tok) | |
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