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|
from textwrap import dedent
import unittest
from ometa.builder import writePython
from terml.nodes import termMaker as t
from terml.parser import parseTerm as term
def dd(txt):
return dedent(txt).strip()
class PythonWriterTests(unittest.TestCase):
"""
Tests for generating Python source from an AST.
"""
def test_exactly(self):
"""
Test generation of code for the 'exactly' pattern.
"""
x = t.Exactly("x")
self.assertEqual(writePython(x ,""),
dd("""
_G_exactly_1, lastError = self.exactly('x')
self.considerError(lastError, None)
_G_exactly_1
"""))
def test_apply(self):
"""
Test generation of code for rule application.
"""
one = t.Action("1")
x = t.Action("x")
a = t.Apply("foo", "main", [one, x])
self.assertEqual(writePython(a, ""),
dd("""
_G_python_1, lastError = (1), None
self.considerError(lastError, None)
_G_python_2, lastError = eval('x', self.globals, _locals), None
self.considerError(lastError, None)
_G_apply_3, lastError = self._apply(self.rule_foo, "foo", [_G_python_1, _G_python_2])
self.considerError(lastError, None)
_G_apply_3
"""))
def test_foreignApply(self):
"""
Test generation of code for calling foreign grammar's rules.
"""
one = t.Action("1")
x = t.Action("x")
a = t.ForeignApply("thegrammar", "foo", "main", [one, x])
self.assertEqual(writePython(a, ""),
dd("""
_G_python_1, lastError = (1), None
self.considerError(lastError, None)
_G_python_2, lastError = eval('x', self.globals, _locals), None
self.considerError(lastError, None)
_G_apply_3, lastError = self.foreignApply("thegrammar", "foo", self.globals, _locals, _G_python_1, _G_python_2)
self.considerError(lastError, None)
_G_apply_3
"""))
def test_superApply(self):
"""
Test generation of code for calling the superclass' implementation of
the current rule.
"""
one = t.Action("1")
x = t.Action("x")
a = t.Apply("super", "main", [one, x])
self.assertEqual(writePython(a, ""),
dd("""
_G_python_1, lastError = (1), None
self.considerError(lastError, None)
_G_python_2, lastError = eval('x', self.globals, _locals), None
self.considerError(lastError, None)
_G_apply_3, lastError = self.superApply("main", _G_python_1, _G_python_2)
self.considerError(lastError, None)
_G_apply_3
"""))
def test_many(self):
"""
Test generation of code for matching zero or more instances of
a pattern.
"""
xs = t.Many(t.Exactly("x"))
self.assertEqual(writePython(xs, ""),
dd("""
def _G_many_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
_G_many_3, lastError = self.many(_G_many_1)
self.considerError(lastError, None)
_G_many_3
"""))
def test_many1(self):
"""
Test generation of code for matching one or more instances of
a pattern.
"""
xs = t.Many1(t.Exactly("x"))
self.assertEqual(writePython(xs, ""),
dd("""
def _G_many1_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
_G_many1_3, lastError = self.many(_G_many1_1, _G_many1_1())
self.considerError(lastError, None)
_G_many1_3
"""))
def test_or(self):
"""
Test code generation for a sequence of alternatives.
"""
xy = t.Or([t.Exactly("x"),
t.Exactly("y")])
self.assertEqual(writePython(xy, ""),
dd("""
def _G_or_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
def _G_or_3():
_G_exactly_4, lastError = self.exactly('y')
self.considerError(lastError, None)
return (_G_exactly_4, self.currentError)
_G_or_5, lastError = self._or([_G_or_1, _G_or_3])
self.considerError(lastError, None)
_G_or_5
"""))
def test_singleOr(self):
"""
Test code generation for a sequence of alternatives.
"""
x1 = t.Or([t.Exactly("x")])
x = t.Exactly("x")
self.assertEqual(writePython(x, ""), writePython(x1, ""))
def test_optional(self):
"""
Test code generation for optional terms.
"""
x = t.Optional(t.Exactly("x"))
self.assertEqual(writePython(x, ""),
dd("""
def _G_optional_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
def _G_optional_3():
return (None, self.input.nullError())
_G_or_4, lastError = self._or([_G_optional_1, _G_optional_3])
self.considerError(lastError, None)
_G_or_4
"""))
def test_not(self):
"""
Test code generation for negated terms.
"""
x = t.Not(t.Exactly("x"))
self.assertEqual(writePython(x ,""),
dd("""
def _G_not_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
_G_not_3, lastError = self._not(_G_not_1)
self.considerError(lastError, None)
_G_not_3
"""))
def test_lookahead(self):
"""
Test code generation for lookahead expressions.
"""
x = t.Lookahead(t.Exactly("x"))
self.assertEqual(writePython(x, ""),
dd("""
def _G_lookahead_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
_G_lookahead_3, lastError = self.lookahead(_G_lookahead_1)
self.considerError(lastError, None)
_G_lookahead_3
"""))
def test_sequence(self):
"""
Test generation of code for sequence patterns.
"""
x = t.Exactly("x")
y = t.Exactly("y")
z = t.And([x, y])
self.assertEqual(writePython(z, ""),
dd("""
_G_exactly_1, lastError = self.exactly('x')
self.considerError(lastError, None)
_G_exactly_2, lastError = self.exactly('y')
self.considerError(lastError, None)
_G_exactly_2
"""))
def test_bind(self):
"""
Test code generation for variable assignment.
"""
x = t.Exactly("x")
b = t.Bind("var", x)
self.assertEqual(writePython(b, ""),
dd("""
_G_exactly_1, lastError = self.exactly('x')
self.considerError(lastError, None)
_locals['var'] = _G_exactly_1
_G_exactly_1
"""))
def test_pred(self):
"""
Test code generation for predicate expressions.
"""
x = t.Predicate(t.Exactly("x"))
self.assertEqual(writePython(x, ""),
dd("""
def _G_pred_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
_G_pred_3, lastError = self.pred(_G_pred_1)
self.considerError(lastError, None)
_G_pred_3
"""))
def test_action(self):
"""
Test code generation for semantic actions.
"""
x = t.Action("doStuff()")
self.assertEqual(writePython(x, ""),
dd("""
_G_python_1, lastError = eval('doStuff()', self.globals, _locals), None
self.considerError(lastError, None)
_G_python_1
"""))
def test_expr(self):
"""
Test code generation for semantic predicates.
"""
x = t.Action("returnStuff()")
self.assertEqual(writePython(x, ""),
dd("""
_G_python_1, lastError = eval('returnStuff()', self.globals, _locals), None
self.considerError(lastError, None)
_G_python_1
"""))
def test_label(self):
"""
Test code generation for custom labels.
"""
xs = t.Label(t.Exactly("x"), 'CustomLabel')
self.assertEqual(writePython(xs, ""),
dd("""
def _G_label_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
_G_label_3, lastError = self.label(_G_label_1, "CustomLabel")
self.considerError(lastError, None)
_G_label_3
"""))
def test_listpattern(self):
"""
Test code generation for list patterns.
"""
x = t.List(t.Exactly("x"))
self.assertEqual(writePython(x, ""),
dd("""
def _G_listpattern_1():
_G_exactly_2, lastError = self.exactly('x')
self.considerError(lastError, None)
return (_G_exactly_2, self.currentError)
_G_listpattern_3, lastError = self.listpattern(_G_listpattern_1)
self.considerError(lastError, None)
_G_listpattern_3
"""))
def test_markAsTree(self):
"""
Grammars containing list patterns are marked as taking
tree-shaped input rather than character streams.
"""
x = t.Rule("foo", t.List(
t.Exactly("x")))
g = t.Grammar("TestGrammar", True, [x])
self.assertTrue("\n tree = True\n" in writePython(g, ""))
def test_rule(self):
"""
Test generation of entire rules.
"""
x = t.Rule("foo", t.Exactly("x"))
self.assertEqual(writePython(x, ""),
dd("""
def rule_foo(self):
_locals = {'self': self}
self.locals['foo'] = _locals
_G_exactly_1, lastError = self.exactly('x')
self.considerError(lastError, 'foo')
return (_G_exactly_1, self.currentError)
"""))
def test_grammar(self):
"""
Test generation of an entire grammar.
"""
r1 = t.Rule("foo", t.Exactly("x"))
r2 = t.Rule("baz", t.Exactly("y"))
x = t.Grammar("BuilderTest", False, [r1, r2])
self.assertEqual(
writePython(x, ""),
dd("""
def createParserClass(GrammarBase, ruleGlobals):
if ruleGlobals is None:
ruleGlobals = {}
class BuilderTest(GrammarBase):
def rule_foo(self):
_locals = {'self': self}
self.locals['foo'] = _locals
_G_exactly_1, lastError = self.exactly('x')
self.considerError(lastError, 'foo')
return (_G_exactly_1, self.currentError)
def rule_baz(self):
_locals = {'self': self}
self.locals['baz'] = _locals
_G_exactly_2, lastError = self.exactly('y')
self.considerError(lastError, 'baz')
return (_G_exactly_2, self.currentError)
if BuilderTest.globals is not None:
BuilderTest.globals = BuilderTest.globals.copy()
BuilderTest.globals.update(ruleGlobals)
else:
BuilderTest.globals = ruleGlobals
return BuilderTest
"""))
|
