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from __future__ import unicode_literals
from prompt_toolkit.contrib.regular_languages import compile
from prompt_toolkit.contrib.regular_languages.compiler import Match, Variables
from prompt_toolkit.contrib.regular_languages.completion import GrammarCompleter
from prompt_toolkit.completion import Completer, Completion, CompleteEvent
from prompt_toolkit.document import Document
import unittest
class GrammarTest(unittest.TestCase):
def test_simple_match(self):
g = compile('hello|world')
m = g.match('hello')
self.assertTrue(isinstance(m, Match))
m = g.match('world')
self.assertTrue(isinstance(m, Match))
m = g.match('somethingelse')
self.assertEqual(m, None)
def test_variable_varname(self):
"""
Test `Variable` with varname.
"""
g = compile('((?P<varname>hello|world)|test)')
m = g.match('hello')
variables = m.variables()
self.assertTrue(isinstance(variables, Variables))
self.assertEqual(variables.get('varname'), 'hello')
self.assertEqual(variables['varname'], 'hello')
m = g.match('world')
variables = m.variables()
self.assertTrue(isinstance(variables, Variables))
self.assertEqual(variables.get('varname'), 'world')
self.assertEqual(variables['varname'], 'world')
m = g.match('test')
variables = m.variables()
self.assertTrue(isinstance(variables, Variables))
self.assertEqual(variables.get('varname'), None)
self.assertEqual(variables['varname'], None)
def test_prefix(self):
"""
Test `match_prefix`.
"""
g = compile(r'(hello\ world|something\ else)')
m = g.match_prefix('hello world')
self.assertTrue(isinstance(m, Match))
m = g.match_prefix('he')
self.assertTrue(isinstance(m, Match))
m = g.match_prefix('')
self.assertTrue(isinstance(m, Match))
m = g.match_prefix('som')
self.assertTrue(isinstance(m, Match))
m = g.match_prefix('hello wor')
self.assertTrue(isinstance(m, Match))
m = g.match_prefix('no-match')
self.assertEqual(m, None)
m = g.match_prefix('ello')
self.assertEqual(m, None)
def test_completer(self):
class completer1(Completer):
def get_completions(self, document, complete_event):
yield Completion('before-%s-after' % document.text, -len(document.text))
yield Completion('before-%s-after-B' % document.text, -len(document.text))
class completer2(Completer):
def get_completions(self, document, complete_event):
yield Completion('before2-%s-after2' % document.text, -len(document.text))
yield Completion('before2-%s-after2-B' % document.text, -len(document.text))
# Create grammar. "var1" + "whitespace" + "var2"
g = compile(r'(?P<var1>[a-z]*) \s+ (?P<var2>[a-z]*)')
# Test 'get_completions()'
completer = GrammarCompleter(g, {'var1': completer1(), 'var2': completer2()})
completions = list(completer.get_completions(
Document('abc def', len('abc def')),
CompleteEvent()))
self.assertEqual(len(completions), 2)
self.assertEqual(completions[0].text, 'before2-def-after2')
self.assertEqual(completions[0].start_position, -3)
self.assertEqual(completions[1].text, 'before2-def-after2-B')
self.assertEqual(completions[1].start_position, -3)
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