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Diffstat (limited to 'ext/ply/test/calclex.py')
-rw-r--r-- | ext/ply/test/calclex.py | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/ext/ply/test/calclex.py b/ext/ply/test/calclex.py new file mode 100644 index 000000000..f8eb91a09 --- /dev/null +++ b/ext/ply/test/calclex.py @@ -0,0 +1,46 @@ +# ----------------------------------------------------------------------------- +# calclex.py +# ----------------------------------------------------------------------------- + +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(t): + r'\d+' + try: + t.value = int(t.value) + except ValueError: + print "Integer value too large", 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.skip(1) + +# Build the lexer +import lex +lex.lex() + + + |