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# testyacc.py
import unittest
try:
import StringIO
except ImportError:
import io as StringIO
import sys
import os
import warnings
sys.path.insert(0,"..")
sys.tracebacklimit = 0
import ply.yacc
import imp
def make_pymodule_path(filename):
path = os.path.dirname(filename)
file = os.path.basename(filename)
mod, ext = os.path.splitext(file)
if sys.hexversion >= 0x3020000:
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 check_expected(result,expected):
resultlines = []
for line in result.splitlines():
if line.startswith("WARNING: "):
line = line[9:]
elif line.startswith("ERROR: "):
line = line[7:]
resultlines.append(line)
expectedlines = expected.splitlines()
if len(resultlines) != len(expectedlines):
return False
for rline,eline in zip(resultlines,expectedlines):
if not rline.endswith(eline):
return False
return True
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)
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"
"Syntax error at 'b'\n"
"Syntax error at 4:18 to 4:22\n"
"Assignment Error at 2:5 to 5:33\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_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"
))
unittest.main()
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