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Diffstat (limited to 'test/pkg_test3/parsing/calclex.py')
-rw-r--r-- | test/pkg_test3/parsing/calclex.py | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/test/pkg_test3/parsing/calclex.py b/test/pkg_test3/parsing/calclex.py new file mode 100644 index 0000000..6ca2c4f --- /dev/null +++ b/test/pkg_test3/parsing/calclex.py @@ -0,0 +1,47 @@ +# ----------------------------------------------------------------------------- +# calclex.py +# ----------------------------------------------------------------------------- + +import ply.lex as lex + +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 %s" % t.value) + t.value = 0 + return t + +t_ignore = " \t" + +def t_newline(t): + r'\n+' + t.lexer.lineno += t.value.count("\n") + +def t_error(t): + print("Illegal character '%s'" % t.value[0]) + t.lexer.skip(1) + +# Build the lexer +lexer = lex.lex(optimize=True, lextab='pkg_test3.generated.lextab') + + + |