#
# plaintext.py: plaintext docstring parsing
# Edward Loper
#
# Created [04/10/01 12:00 AM]
# $Id: plaintext.py 1574 2007-03-07 02:55:14Z dvarrazzo $
#

"""
Parser for plaintext docstrings.  Plaintext docstrings are rendered as
verbatim output, preserving all whitespace.
"""
__docformat__ = 'epytext en'

from epydoc.markup import *
from epydoc.util import plaintext_to_html, plaintext_to_latex

def parse_docstring(docstring, errors, **options):
    """
    @return: A pair C{(M{d}, M{e})}, where C{M{d}} is a
        C{ParsedDocstring} that encodes the contents of the given
        plaintext docstring; and C{M{e}} is a list of errors that were
        generated while parsing the docstring.
    @rtype: C{L{ParsedPlaintextDocstring}, C{list} of L{ParseError}}
    """
    return ParsedPlaintextDocstring(docstring, **options)

class ParsedPlaintextDocstring(ParsedDocstring):
    def __init__(self, text, **options):
        self._verbatim = options.get('verbatim', 1)
        if text is None: raise ValueError, 'Bad text value (expected a str)'
        self._text = text

    def to_html(self, docstring_linker, **options):
        if options.get('verbatim', self._verbatim) == 0:
            return plaintext_to_html(self.to_plaintext(docstring_linker))
        else:
            return ParsedDocstring.to_html(self, docstring_linker, **options)

    def to_latex(self, docstring_linker, **options):
        if options.get('verbatim', self._verbatim) == 0:
            return plaintext_to_latex(self.to_plaintext(docstring_linker))
        else:
            return ParsedDocstring.to_latex(self, docstring_linker, **options)

    def to_plaintext(self, docstring_linker, **options):
        if 'indent' in options:
            indent = options['indent']
            lines = self._text.split('\n')
            return '\n'.join([' '*indent+l for l in lines])+'\n'
        return self._text+'\n'
    
    _SUMMARY_RE = re.compile(r'(\s*[\w\W]*?(?:\.(\s|$)|[\n][\t ]*[\n]))')

    def summary(self):
        m = self._SUMMARY_RE.match(self._text)
        if m:
            other = self._text[m.end():]
            return (ParsedPlaintextDocstring(m.group(1), verbatim=0),
                    other != '' and not other.isspace())
        else:
            parts = self._text.strip('\n').split('\n', 1)
            if len(parts) == 1:
                summary = parts[0]
                other = False
            else:
                summary = parts[0] + '...'
                other = True
                
            return ParsedPlaintextDocstring(summary, verbatim=0), other
        
#     def concatenate(self, other):
#         if not isinstance(other, ParsedPlaintextDocstring):
#             raise ValueError, 'Could not concatenate docstrings'
#         text = self._text+other._text
#         options = self._options.copy()
#         options.update(other._options)
#         return ParsedPlaintextDocstring(text, options)