# testyacc.py import unittest try: import StringIO except ImportError: import io as StringIO import sys import os import warnings import re import platform sys.path.insert(0,"..") sys.tracebacklimit = 0 import ply.yacc def make_pymodule_path(filename): path = os.path.dirname(filename) file = os.path.basename(filename) mod, ext = os.path.splitext(file) if sys.hexversion >= 0x3040000: import importlib.util fullpath = importlib.util.cache_from_source(filename, ext=='.pyc') elif sys.hexversion >= 0x3020000: import imp modname = mod+"."+imp.get_tag()+ext fullpath = os.path.join(path,'__pycache__',modname) else: fullpath = filename return fullpath def pymodule_out_exists(filename): return os.path.exists(make_pymodule_path(filename)) def pymodule_out_remove(filename): os.remove(make_pymodule_path(filename)) def implementation(): if platform.system().startswith("Java"): return "Jython" elif hasattr(sys, "pypy_version_info"): return "PyPy" else: return "CPython" # Check the output to see if it contains all of a set of expected output lines. # This alternate implementation looks weird, but is needed to properly handle # some variations in error message order that occurs due to dict hash table # randomization that was introduced in Python 3.3 def check_expected(result, expected): # Normalize 'state n' text to account for randomization effects in Python 3.3 expected = re.sub(r' state \d+', 'state ', expected) result = re.sub(r' state \d+', 'state ', result) resultlines = set() for line in result.splitlines(): if line.startswith("WARNING: "): line = line[9:] elif line.startswith("ERROR: "): line = line[7:] resultlines.add(line) # Selectively remove expected lines from the output for eline in expected.splitlines(): resultlines = set(line for line in resultlines if not line.endswith(eline)) # Return True if no result lines remain return not bool(resultlines) def run_import(module): code = "import "+module exec(code) del sys.modules[module] # Tests related to errors and warnings when building parsers class YaccErrorWarningTests(unittest.TestCase): def setUp(self): sys.stderr = StringIO.StringIO() sys.stdout = StringIO.StringIO() try: os.remove("parsetab.py") pymodule_out_remove("parsetab.pyc") except OSError: pass if sys.hexversion >= 0x3020000: warnings.filterwarnings('ignore', category=ResourceWarning) warnings.filterwarnings('ignore', category=DeprecationWarning) def tearDown(self): sys.stderr = sys.__stderr__ sys.stdout = sys.__stdout__ def test_yacc_badargs(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_badargs") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_badargs.py:23: Rule 'p_statement_assign' has too many arguments\n" "yacc_badargs.py:27: Rule 'p_statement_expr' requires an argument\n" )) def test_yacc_badid(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_badid") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_badid.py:32: Illegal name 'bad&rule' in rule 'statement'\n" "yacc_badid.py:36: Illegal rule name 'bad&rule'\n" )) def test_yacc_badprec(self): try: run_import("yacc_badprec") except ply.yacc.YaccError: result = sys.stderr.getvalue() self.assert_(check_expected(result, "precedence must be a list or tuple\n" )) def test_yacc_badprec2(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_badprec2") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Bad precedence table\n" )) def test_yacc_badprec3(self): run_import("yacc_badprec3") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Precedence already specified for terminal 'MINUS'\n" "Generating LALR tables\n" )) def test_yacc_badrule(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_badrule") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_badrule.py:24: Syntax error. Expected ':'\n" "yacc_badrule.py:28: Syntax error in rule 'statement'\n" "yacc_badrule.py:33: Syntax error. Expected ':'\n" "yacc_badrule.py:42: Syntax error. Expected ':'\n" )) def test_yacc_badtok(self): try: run_import("yacc_badtok") except ply.yacc.YaccError: result = sys.stderr.getvalue() self.assert_(check_expected(result, "tokens must be a list or tuple\n")) def test_yacc_dup(self): run_import("yacc_dup") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_dup.py:27: Function p_statement redefined. Previously defined on line 23\n" "Token 'EQUALS' defined, but not used\n" "There is 1 unused token\n" "Generating LALR tables\n" )) def test_yacc_error1(self): try: run_import("yacc_error1") except ply.yacc.YaccError: result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_error1.py:61: p_error() requires 1 argument\n")) def test_yacc_error2(self): try: run_import("yacc_error2") except ply.yacc.YaccError: result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_error2.py:61: p_error() requires 1 argument\n")) def test_yacc_error3(self): try: run_import("yacc_error3") except ply.yacc.YaccError: e = sys.exc_info()[1] result = sys.stderr.getvalue() self.assert_(check_expected(result, "'p_error' defined, but is not a function or method\n")) def test_yacc_error4(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_error4") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_error4.py:62: Illegal rule name 'error'. Already defined as a token\n" )) def test_yacc_error5(self): run_import("yacc_error5") result = sys.stdout.getvalue() self.assert_(check_expected(result, "Group at 3:10 to 3:12\n" "Undefined name 'a'\n" "Syntax error at 'b'\n" "Syntax error at 4:18 to 4:22\n" "Assignment Error at 2:5 to 5:27\n" "13\n" )) def test_yacc_error6(self): run_import("yacc_error6") result = sys.stdout.getvalue() self.assert_(check_expected(result, "a=7\n" "Line 3: Syntax error at '*'\n" "c=21\n" )) def test_yacc_error7(self): run_import("yacc_error7") result = sys.stdout.getvalue() self.assert_(check_expected(result, "a=7\n" "Line 3: Syntax error at '*'\n" "c=21\n" )) def test_yacc_inf(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_inf") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Token 'NUMBER' defined, but not used\n" "There is 1 unused token\n" "Infinite recursion detected for symbol 'statement'\n" "Infinite recursion detected for symbol 'expression'\n" )) def test_yacc_literal(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_literal") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_literal.py:36: Literal token '**' in rule 'expression' may only be a single character\n" )) def test_yacc_misplaced(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_misplaced") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_misplaced.py:32: Misplaced '|'\n" )) def test_yacc_missing1(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_missing1") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_missing1.py:24: Symbol 'location' used, but not defined as a token or a rule\n" )) def test_yacc_nested(self): run_import("yacc_nested") result = sys.stdout.getvalue() self.assert_(check_expected(result, "A\n" "A\n" "A\n", )) def test_yacc_nodoc(self): run_import("yacc_nodoc") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_nodoc.py:27: No documentation string specified in function 'p_statement_expr' (ignored)\n" "Generating LALR tables\n" )) def test_yacc_noerror(self): run_import("yacc_noerror") result = sys.stderr.getvalue() self.assert_(check_expected(result, "no p_error() function is defined\n" "Generating LALR tables\n" )) def test_yacc_nop(self): run_import("yacc_nop") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_nop.py:27: Possible grammar rule 'statement_expr' defined without p_ prefix\n" "Generating LALR tables\n" )) def test_yacc_notfunc(self): run_import("yacc_notfunc") result = sys.stderr.getvalue() self.assert_(check_expected(result, "'p_statement_assign' not defined as a function\n" "Token 'EQUALS' defined, but not used\n" "There is 1 unused token\n" "Generating LALR tables\n" )) def test_yacc_notok(self): try: run_import("yacc_notok") except ply.yacc.YaccError: result = sys.stderr.getvalue() self.assert_(check_expected(result, "No token list is defined\n")) def test_yacc_rr(self): run_import("yacc_rr") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Generating LALR tables\n" "1 reduce/reduce conflict\n" "reduce/reduce conflict in state 15 resolved using rule (statement -> NAME EQUALS NUMBER)\n" "rejected rule (expression -> NUMBER) in state 15\n" )) def test_yacc_rr_unused(self): run_import("yacc_rr_unused") result = sys.stderr.getvalue() self.assert_(check_expected(result, "no p_error() function is defined\n" "Generating LALR tables\n" "3 reduce/reduce conflicts\n" "reduce/reduce conflict in state 1 resolved using rule (rule3 -> A)\n" "rejected rule (rule4 -> A) in state 1\n" "reduce/reduce conflict in state 1 resolved using rule (rule3 -> A)\n" "rejected rule (rule5 -> A) in state 1\n" "reduce/reduce conflict in state 1 resolved using rule (rule4 -> A)\n" "rejected rule (rule5 -> A) in state 1\n" "Rule (rule5 -> A) is never reduced\n" )) def test_yacc_simple(self): run_import("yacc_simple") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Generating LALR tables\n" )) def test_yacc_sr(self): run_import("yacc_sr") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Generating LALR tables\n" "20 shift/reduce conflicts\n" )) def test_yacc_term1(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_term1") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_term1.py:24: Illegal rule name 'NUMBER'. Already defined as a token\n" )) def test_yacc_unicode_literals(self): run_import("yacc_unicode_literals") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Generating LALR tables\n" )) def test_yacc_unused(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_unused") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_unused.py:62: Symbol 'COMMA' used, but not defined as a token or a rule\n" "Symbol 'COMMA' is unreachable\n" "Symbol 'exprlist' is unreachable\n" )) def test_yacc_unused_rule(self): run_import("yacc_unused_rule") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_unused_rule.py:62: Rule 'integer' defined, but not used\n" "There is 1 unused rule\n" "Symbol 'integer' is unreachable\n" "Generating LALR tables\n" )) def test_yacc_uprec(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_uprec") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_uprec.py:37: Nothing known about the precedence of 'UMINUS'\n" )) def test_yacc_uprec2(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_uprec2") result = sys.stderr.getvalue() self.assert_(check_expected(result, "yacc_uprec2.py:37: Syntax error. Nothing follows %prec\n" )) def test_yacc_prec1(self): self.assertRaises(ply.yacc.YaccError,run_import,"yacc_prec1") result = sys.stderr.getvalue() self.assert_(check_expected(result, "Precedence rule 'left' defined for unknown symbol '+'\n" "Precedence rule 'left' defined for unknown symbol '*'\n" "Precedence rule 'left' defined for unknown symbol '-'\n" "Precedence rule 'left' defined for unknown symbol '/'\n" )) def test_pkg_test1(self): from pkg_test1 import parser self.assertTrue(os.path.exists('pkg_test1/parsing/parsetab.py')) self.assertTrue(os.path.exists('pkg_test1/parsing/lextab.py')) self.assertTrue(os.path.exists('pkg_test1/parsing/parser.out')) r = parser.parse('3+4+5') self.assertEqual(r, 12) def test_pkg_test2(self): from pkg_test2 import parser self.assertTrue(os.path.exists('pkg_test2/parsing/calcparsetab.py')) self.assertTrue(os.path.exists('pkg_test2/parsing/calclextab.py')) self.assertTrue(os.path.exists('pkg_test2/parsing/parser.out')) r = parser.parse('3+4+5') self.assertEqual(r, 12) def test_pkg_test3(self): from pkg_test3 import parser self.assertTrue(os.path.exists('pkg_test3/generated/parsetab.py')) self.assertTrue(os.path.exists('pkg_test3/generated/lextab.py')) self.assertTrue(os.path.exists('pkg_test3/generated/parser.out')) r = parser.parse('3+4+5') self.assertEqual(r, 12) unittest.main()