view mercurial/thirdparty/zope/interface/document.py @ 37179:49630e75635d

thirdparty: allow zope.interface.advice to be lazily imported

The symbol from this module is only used in functions. Let's access
that symbol through its imported module so importing
zope.interface.advice can be lazy.

Differential Revision: https://phab.mercurial-scm.org/D2931

##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
""" Pretty-Print an Interface object as structured text (Yum)

This module provides a function, asStructuredText, for rendering an
interface as structured text.
"""

from __future__ import absolute_import

from . import Interface

def asStructuredText(I, munge=0, rst=False):
    """ Output structured text format.  Note, this will whack any existing
    'structured' format of the text.

    If `rst=True`, then the output will quote all code as inline literals in
    accordance with 'reStructuredText' markup principles.
    """

    if rst:
        inline_literal = lambda s: "``%s``" % (s,)
    else:
        inline_literal = lambda s: s

    r = [inline_literal(I.getName())]
    outp = r.append
    level = 1

    if I.getDoc():
        outp(_justify_and_indent(_trim_doc_string(I.getDoc()), level))

    bases = [base
             for base in I.__bases__
             if base is not Interface
             ]
    if bases:
        outp(_justify_and_indent("This interface extends:", level, munge))
        level += 1
        for b in bases:
            item = "o %s" % inline_literal(b.getName())
            outp(_justify_and_indent(_trim_doc_string(item), level, munge))
        level -= 1

    namesAndDescriptions = sorted(I.namesAndDescriptions())

    outp(_justify_and_indent("Attributes:", level, munge))
    level += 1
    for name, desc in namesAndDescriptions:
        if not hasattr(desc, 'getSignatureString'):   # ugh...
            item = "%s -- %s" % (inline_literal(desc.getName()),
                                 desc.getDoc() or 'no documentation')
            outp(_justify_and_indent(_trim_doc_string(item), level, munge))
    level -= 1

    outp(_justify_and_indent("Methods:", level, munge))
    level += 1
    for name, desc in namesAndDescriptions:
        if hasattr(desc, 'getSignatureString'):   # ugh...
            _call = "%s%s" % (desc.getName(), desc.getSignatureString())
            item = "%s -- %s" % (inline_literal(_call),
                                 desc.getDoc() or 'no documentation')
            outp(_justify_and_indent(_trim_doc_string(item), level, munge))

    return "\n\n".join(r) + "\n\n"


def asReStructuredText(I, munge=0):
    """ Output reStructuredText format.  Note, this will whack any existing
    'structured' format of the text."""
    return asStructuredText(I, munge=munge, rst=True)


def _trim_doc_string(text):
    """ Trims a doc string to make it format
    correctly with structured text. """

    lines = text.replace('\r\n', '\n').split('\n')
    nlines = [lines.pop(0)]
    if lines:
        min_indent = min([len(line) - len(line.lstrip())
                          for line in lines])
        for line in lines:
            nlines.append(line[min_indent:])

    return '\n'.join(nlines)


def _justify_and_indent(text, level, munge=0, width=72):
    """ indent and justify text, rejustify (munge) if specified """

    indent = " " * level

    if munge:
        lines = []
        line = indent
        text = text.split()

        for word in text:
            line = ' '.join([line, word])
            if len(line) > width:
                lines.append(line)
                line = indent
        else:
            lines.append(line)

        return '\n'.join(lines)

    else:
        return indent + \
            text.strip().replace("\r\n", "\n") .replace("\n", "\n" + indent)