diff options
-rw-r--r-- | test/pkg_test5/__init__.py | 9 | ||||
-rw-r--r-- | test/pkg_test5/parsing/__init__.py | 0 | ||||
-rw-r--r-- | test/pkg_test5/parsing/calclex.py | 48 | ||||
-rw-r--r-- | test/pkg_test5/parsing/calcparse.py | 67 | ||||
-rw-r--r-- | test/testyacc.py | 8 |
5 files changed, 132 insertions, 0 deletions
diff --git a/test/pkg_test5/__init__.py b/test/pkg_test5/__init__.py new file mode 100644 index 0000000..0e19558 --- /dev/null +++ b/test/pkg_test5/__init__.py @@ -0,0 +1,9 @@ +# Tests proper handling of lextab and parsetab files in package structures + +# Here for testing purposes +import sys +if '..' not in sys.path: + sys.path.insert(0, '..') + +from .parsing.calcparse import parser + diff --git a/test/pkg_test5/parsing/__init__.py b/test/pkg_test5/parsing/__init__.py new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/test/pkg_test5/parsing/__init__.py diff --git a/test/pkg_test5/parsing/calclex.py b/test/pkg_test5/parsing/calclex.py new file mode 100644 index 0000000..e8759b6 --- /dev/null +++ b/test/pkg_test5/parsing/calclex.py @@ -0,0 +1,48 @@ +# ----------------------------------------------------------------------------- +# 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 +import os.path +lexer = lex.lex(optimize=True, outputdir=os.path.dirname(__file__)) + + + diff --git a/test/pkg_test5/parsing/calcparse.py b/test/pkg_test5/parsing/calcparse.py new file mode 100644 index 0000000..2a1ddfe --- /dev/null +++ b/test/pkg_test5/parsing/calcparse.py @@ -0,0 +1,67 @@ +# ----------------------------------------------------------------------------- +# yacc_simple.py +# +# A simple, properly specifier grammar +# ----------------------------------------------------------------------------- + +from .calclex import tokens +from ply import yacc + +# Parsing rules +precedence = ( + ('left','PLUS','MINUS'), + ('left','TIMES','DIVIDE'), + ('right','UMINUS'), + ) + +# dictionary of names +names = { } + +def p_statement_assign(t): + 'statement : NAME EQUALS expression' + names[t[1]] = t[3] + +def p_statement_expr(t): + 'statement : expression' + t[0] = t[1] + +def p_expression_binop(t): + '''expression : expression PLUS expression + | expression MINUS expression + | expression TIMES expression + | expression DIVIDE expression''' + if t[2] == '+' : t[0] = t[1] + t[3] + elif t[2] == '-': t[0] = t[1] - t[3] + elif t[2] == '*': t[0] = t[1] * t[3] + elif t[2] == '/': t[0] = t[1] / t[3] + +def p_expression_uminus(t): + 'expression : MINUS expression %prec UMINUS' + t[0] = -t[2] + +def p_expression_group(t): + 'expression : LPAREN expression RPAREN' + t[0] = t[2] + +def p_expression_number(t): + 'expression : NUMBER' + t[0] = t[1] + +def p_expression_name(t): + 'expression : NAME' + try: + t[0] = names[t[1]] + except LookupError: + print("Undefined name '%s'" % t[1]) + t[0] = 0 + +def p_error(t): + print("Syntax error at '%s'" % t.value) + +import os.path +parser = yacc.yacc(outputdir=os.path.dirname(__file__)) + + + + + diff --git a/test/testyacc.py b/test/testyacc.py index 90b0ebb..7620c38 100644 --- a/test/testyacc.py +++ b/test/testyacc.py @@ -433,4 +433,12 @@ class YaccErrorWarningTests(unittest.TestCase): r = parser.parse('3+4+5') self.assertEqual(r, 12) + def test_pkg_test5(self): + from pkg_test5 import parser + self.assertTrue(os.path.exists('pkg_test5/parsing/parsetab.py')) + self.assertTrue(os.path.exists('pkg_test5/parsing/lextab.py')) + self.assertTrue(os.path.exists('pkg_test5/parsing/parser.out')) + r = parser.parse('3+4+5') + self.assertEqual(r, 12) + unittest.main() |