| # testyacc.py |
| |
| import unittest |
| try: |
| import StringIO |
| except ImportError: |
| import io as StringIO |
| |
| import sys |
| import os |
| |
| sys.path.insert(0,"..") |
| sys.tracebacklimit = 0 |
| |
| import ply.yacc |
| |
| 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") |
| os.remove("parsetab.pyc") |
| except OSError: |
| pass |
| |
| 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_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() |
| print repr(result) |
| 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() |
