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author | David Beazley <dave@dabeaz.com> | 2022-10-27 13:44:12 -0500 |
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committer | David Beazley <dave@dabeaz.com> | 2022-10-27 13:44:12 -0500 |
commit | af80858e888c5f36979da88fcb1080de7b848967 (patch) | |
tree | 2f2fb95414baee83e489eac1b936602599ea9eba /tests/lex_object.py | |
parent | 818ab0684e33f5f513fc839673ff56ea330b6380 (diff) | |
download | ply-af80858e888c5f36979da88fcb1080de7b848967.tar.gz |
Reorganization. Added makefile
Diffstat (limited to 'tests/lex_object.py')
-rw-r--r-- | tests/lex_object.py | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/tests/lex_object.py b/tests/lex_object.py new file mode 100644 index 0000000..2fa7537 --- /dev/null +++ b/tests/lex_object.py @@ -0,0 +1,53 @@ +# ----------------------------------------------------------------------------- +# lex_object.py +# ----------------------------------------------------------------------------- + +import ply.lex as lex + +class CalcLexer: + tokens = ( + 'NAME','NUMBER', + 'PLUS','MINUS','TIMES','DIVIDE','EQUALS', + 'LPAREN','RPAREN', + ) + + # 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(self,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(self,t): + r'\n+' + t.lineno += t.value.count("\n") + + def t_error(self,t): + print("Illegal character '%s'" % t.value[0]) + t.lexer.skip(1) + + +calc = CalcLexer() + +# Build the lexer +lex.lex(object=calc) +lex.runmain(data="3+4") + + + + |