Unit tests for parser parameters.

tests/unit/test_parser_params.py

+ 
+# -*- coding: utf-8 -*-
+#######################################################################
+# Name: test_parser_params
+# Purpose: Test for parser parameters.
+# Author: Igor R. Dejanović <igor DOT dejanovic AT gmail DOT com>
+# Copyright: (c) 2014 Igor R. Dejanović <igor DOT dejanovic AT gmail DOT com>
+# License: MIT License
+#######################################################################
+
+from __future__ import unicode_literals
+import pytest
+from arpeggio import ParserPython, NoMatch
+from arpeggio import RegExMatch as _
+
+
+def test_autokwd():
+    """
+    autokwd will match keywords on word boundaries.
+    """
+    def grammar():     return ("one", "two", "three")
+
+    parser = ParserPython(grammar, autokwd=True)
+
+    # If autokwd is enabled this should parse without error.
+    parser.parse("one two three")
+
+    # But this will not parse because each word to match
+    # will be, by default, tried to match as a whole word
+    with pytest.raises(NoMatch):
+        parser.parse("onetwothree")
+
+    parser = ParserPython(grammar, autokwd=False)
+    # If we turn off the autokwd than this will match.
+    parser.parse("one two three")
+    parser.parse("onetwothree")
+
+
+def test_skipws():
+    """
+    skipws will skip whitespaces.
+    """
+
+    def grammar():     return ("one", "two", "three")
+
+    parser = ParserPython(grammar)
+
+    # If skipws is on this should parse without error.
+    parser.parse("one two three")
+
+    # If not the same input will raise exception.
+    parser = ParserPython(grammar, skipws=False)
+    with pytest.raises(NoMatch):
+        parser.parse("one two three")
+
+
+def test_ws():
+    """
+    ws consists of chars that will be skipped if skipws is enables.
+    By default it consists of space, tab and newline.
+    """
+
+    def grammar():     return ("one", "two", "three")
+
+    parser = ParserPython(grammar)
+
+    # With default ws this should parse without error
+    parser.parse("""one
+                  two   three""")
+
+    # If we make only a space char to be ws than the
+    # same input will raise exception.
+    parser = ParserPython(grammar, ws=" ")
+    with pytest.raises(NoMatch):
+        parser.parse("""one
+                  two   three""")
+
+    # But if only spaces are between words than it will
+    # parse.
+    parser.parse("one two  three")
+