python - "SyntaxError: Can't build lexer"? -
here code:
import ply.lex lex tokens = ( 'langle', # < 'langleslash', # </ 'rangle', # > 'equal', # = 'string', # "hello" 'word') # welcome! state = ( ("htmlcomment", "exclusive"), ) t_ignore = ' ' def t_htmlcomment(token): r'<!--' token.lexer.begin('htmlcomment') def t_htmlcomment_end(token): r'-->' token.lexer.lineno += token.value.count('\n') token.lexer.begin('initial') def t_htmlcomment_error(token): token.lexer.skip(1) def t_newline(token): r'\n' token.lexer.lineno += 1 pass def t_langleslash(token): r'</' return token def t_langle(token): r'<' return token def t_rangle(token): r'>' return token def t_equal(token): r'=' return token def t_string(token): r'"[^"]*"' token.value = token.value[1:-1] # dropping off double quotes return token def t_word(token): r'[^ <>\n]+' return token webpage = "this <b>my</b> webpage" htmllexer = lex.lex() htmllexer.input(webpage) while true: tok = htmllexer.token() if not tok: break print(tok) when run error:
traceback (most recent call last): file "/home/******/documents/pro/main.py", line 62, in <module> htmllexer = lex.lex() file "/usr/lib/python2.7/dist-packages/ply/lex.py", line 901, in lex raise syntaxerror("can't build lexer") syntaxerror: can't build lexer i think problem here:
state = ( ("htmlcomment", "exclusive"), ) but cant fix it.
does have suggestions how can fix that?
thank help!
there might problem t_ functions
Comments
Post a Comment