from simpleparse.common import numbers, strings, comments
from simpleparse.parser import Parser
from simpleparse.dispatchprocessor import DispatchProcessor, dispatch

class MyProcessor(DispatchProcessor):
    # http://simpleparse.sourceforge.net/pydoc/simpleparse.dispatchprocessor.html#DispatchProcessor
    # The method names here correspond to the grammar's productions (below)
    def file(self, (tag, start, stop, subtags), buffer):
        print tag, start, stop
    def section(self, (tag, start, stop, subtags), buffer):
        print tag, start, stop
        for x in subtags:
            dispatch(self, x, buffer)
    def body(self, (tag, start, stop, subtags), buffer):
        print tag, start, stop
        for x in subtags:
            dispatch(self, x, buffer)
    def statement(self, (tag, start, stop, subtags), buffer):
        print tag, start, stop, buffer[start:stop].strip()
    def identifier(self, (tag, start, stop, subtags), buffer):
        print tag, start, stop, buffer[start:stop]
    def ts(self, (tag, start, stop, subtags), buffer):
        print tag, start, stop

class MyParser(Parser):
    # http://simpleparse.sourceforge.net/pydoc/simpleparse.parser.html#Parser
    def buildProcessor(self):
        return MyProcessor()

# This is copied straight out of the following website which
# has more details,
# http://simpleparse.sourceforge.net/scanning_with_simpleparse.html
# Here is simpleparser's grammar for reading grammars:
# http://simpleparse.sourceforge.net/simpleparse_grammars.html
parser = MyParser(
  # The EBNF:
  r'''
  file           :=  [ \t\n]*, section+
  section        :=  '[',identifier!,']'!, ts,'\n', body
  body           :=  statement*
  statement      :=  (ts,semicolon_comment)/equality/nullline
  nullline       :=  ts,'\n'
  equality       :=  ts, identifier,ts,'=',ts,identified,ts,'\n'
  identifier     :=  [a-zA-Z], [a-zA-Z0-9_]*
  identified     :=  string/number/identifier
  ts             :=  [ \t]*
  ''',
  # The root/starting production:
  'file')

data = '''
[foobar]
baz = notbaz

[gooober]
banana = apple
pear = peach
'''

success, result, nextchar = parser.parse(data)