Python LineStart.addParseAction Examples

Example #1

File: pyparsing_block_parser.py Project: williamwanjia/Python-software-engineering

 def _define_grammar(self):
     '''define the grammar to be used, and add actions'''
     self._define_actions()
     eol = LineEnd().suppress()
     white = Optional(White()).suppress()
     begin = Keyword('begin').suppress()
     end = Keyword('end').suppress()
     comment = (Literal('#') + restOfLine).suppress()
     data_value = Combine(OneOrMore(CharsNotIn('#\n\r')))
     data_line = (LineStart() + white + Optional(data_value) +
                  Optional(comment) + eol)
     block_name = Word(alphas, alphanums + '_')
     begin_block = (LineStart() + begin + block_name +
                    Optional(comment) + eol)
     end_block = LineStart() + end + block_name + Optional(comment) + eol
     junk = ZeroOrMore(LineStart() + white + NotAny(begin) +
                       restOfLine + eol).suppress()
     data = Group(ZeroOrMore(NotAny(end) + data_line))
     block_def = begin_block + data + end_block
     block_defs = junk + OneOrMore(block_def + junk)
     self._grammar = block_defs
     begin_block.addParseAction(self._begin_block_action)
     end_block.addParseAction(self._end_block_action)
     data_value.addParseAction(self._data_value_action)

Example #2

File: pyparsing_block_parser_script.py Project: bizatheo/training-material

eol = LineEnd().suppress()
begin = Keyword("begin").suppress()
end = Keyword("end").suppress()
comment = (Literal("#") + restOfLine).suppress()
data_value = Combine(OneOrMore(CharsNotIn("#\n\r")))
data = LineStart() + Optional(data_value) + Optional(comment) + eol
block_name = Word(alphas, alphanums + "_")
begin_block = LineStart() + begin + block_name + Optional(comment) + eol
end_block = LineStart() + end + block_name + Optional(comment) + eol
junk = ZeroOrMore(LineStart() + NotAny(begin) + restOfLine + eol).suppress()
block_def = begin_block + Group(ZeroOrMore(NotAny(end) + data)) + end_block
block_defs = junk + OneOrMore(block_def + junk)

begin_block.addParseAction(create_block)
end_block.addParseAction(finish_block)
data_value.addParseAction(handle_data)

test_str = """
bla bla
begin block_1 # bla bla
    0.17  # suspicious value
# comment line
   -7.34
end block_1
# and noe the second block
begin block_2
    17.34
    11.8
end block_2

Example #3

eol = LineEnd().suppress()
begin = Keyword('begin').suppress()
end = Keyword('end').suppress()
comment = (Literal('#') + restOfLine).suppress()
data_value = Combine(OneOrMore(CharsNotIn('#\n\r')))
data = LineStart() + Optional(data_value) + Optional(comment) + eol
block_name = Word(alphas, alphanums + '_')
begin_block = LineStart() + begin + block_name + Optional(comment) + eol
end_block = LineStart() + end + block_name + Optional(comment) + eol
junk = ZeroOrMore(LineStart() + NotAny(begin) + restOfLine + eol).suppress()
block_def = begin_block + Group(ZeroOrMore(NotAny(end) + data)) + end_block
block_defs = junk + OneOrMore(block_def + junk)

begin_block.addParseAction(create_block)
end_block.addParseAction(finish_block)
data_value.addParseAction(handle_data)

test_str = '''
bla bla
begin block_1 # bla bla
    0.17  # suspicious value
# comment line
   -7.34
end block_1
# and noe the second block
begin block_2
    17.34
    11.8
end block_2