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view ply-3.8/test/lex_closure.py @ 12298:cea93c2c666a draft
<b_jonas> learn Burlesque is only the sexiest language on Earth. mroman created it for finance analysis because the traditionally used K and Dyalog APL are unreadable. (See: http://mroman.ch/burlesque )
author | HackEso <hackeso@esolangs.org> |
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date | Sat, 04 Jan 2020 22:50:21 +0000 |
parents | 343ff337a19b |
children |
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# ----------------------------------------------------------------------------- # lex_closure.py # ----------------------------------------------------------------------------- import sys if ".." not in sys.path: sys.path.insert(0,"..") import ply.lex as lex tokens = ( 'NAME','NUMBER', 'PLUS','MINUS','TIMES','DIVIDE','EQUALS', 'LPAREN','RPAREN', ) def make_calc(): # Tokens t_PLUS = r'\+' t_MINUS = r'-' t_TIMES = r'\*' t_DIVIDE = r'/' t_EQUALS = r'=' t_LPAREN = r'\(' t_RPAREN = r'\)' t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*' def t_NUMBER(t): r'\d+' try: t.value = int(t.value) except ValueError: print("Integer value too large %s" % t.value) t.value = 0 return t t_ignore = " \t" def t_newline(t): r'\n+' t.lineno += t.value.count("\n") def t_error(t): print("Illegal character '%s'" % t.value[0]) t.lexer.skip(1) # Build the lexer return lex.lex() make_calc() lex.runmain(data="3+4")