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annotate planemo/lib/python3.7/site-packages/docutils/readers/__init__.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 # $Id: __init__.py 8239 2018-11-21 21:46:00Z milde $
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2 # Authors: David Goodger <goodger@python.org>; Ueli Schlaepfer
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3 # Copyright: This module has been placed in the public domain.
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4
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5 """
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6 This package contains Docutils Reader modules.
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7 """
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8
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9 __docformat__ = 'reStructuredText'
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10
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11 import sys
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12
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13 from docutils import utils, parsers, Component
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14 from docutils.transforms import universal
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15
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16
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17 class Reader(Component):
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18
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19 """
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20 Abstract base class for docutils Readers.
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21
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22 Each reader module or package must export a subclass also called 'Reader'.
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23
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24 The two steps of a Reader's responsibility are to read data from the
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25 source Input object and parse the data with the Parser object.
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26 Call `read()` to process a document.
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27 """
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28
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29 component_type = 'reader'
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30 config_section = 'readers'
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31
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32 def get_transforms(self):
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33 return Component.get_transforms(self) + [
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34 universal.Decorations,
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35 universal.ExposeInternals,
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36 universal.StripComments,]
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37
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38 def __init__(self, parser=None, parser_name=None):
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39 """
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40 Initialize the Reader instance.
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41
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42 Several instance attributes are defined with dummy initial values.
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43 Subclasses may use these attributes as they wish.
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44 """
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45
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46 self.parser = parser
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47 """A `parsers.Parser` instance shared by all doctrees. May be left
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48 unspecified if the document source determines the parser."""
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49
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50 if parser is None and parser_name:
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51 self.set_parser(parser_name)
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52
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53 self.source = None
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54 """`docutils.io` IO object, source of input data."""
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55
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56 self.input = None
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57 """Raw text input; either a single string or, for more complex cases,
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58 a collection of strings."""
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59
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60 def set_parser(self, parser_name):
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61 """Set `self.parser` by name."""
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62 parser_class = parsers.get_parser_class(parser_name)
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63 self.parser = parser_class()
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64
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65 def read(self, source, parser, settings):
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66 self.source = source
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67 if not self.parser:
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68 self.parser = parser
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69 self.settings = settings
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70 self.input = self.source.read()
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71 self.parse()
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72 return self.document
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73
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74 def parse(self):
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75 """Parse `self.input` into a document tree."""
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76 self.document = document = self.new_document()
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77 self.parser.parse(self.input, document)
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78 document.current_source = document.current_line = None
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79
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80 def new_document(self):
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81 """Create and return a new empty document tree (root node)."""
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82 document = utils.new_document(self.source.source_path, self.settings)
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83 return document
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84
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85
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86 class ReReader(Reader):
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87
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88 """
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89 A reader which rereads an existing document tree (e.g. a
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90 deserializer).
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91
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92 Often used in conjunction with `writers.UnfilteredWriter`.
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93 """
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94
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95 def get_transforms(self):
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96 # Do not add any transforms. They have already been applied
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97 # by the reader which originally created the document.
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98 return Component.get_transforms(self)
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99
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100
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101 _reader_aliases = {}
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102
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103 def get_reader_class(reader_name):
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104 """Return the Reader class from the `reader_name` module."""
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105 reader_name = reader_name.lower()
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106 if reader_name in _reader_aliases:
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107 reader_name = _reader_aliases[reader_name]
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108 try:
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109 module = __import__(reader_name, globals(), locals(), level=1)
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110 except ImportError:
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111 module = __import__(reader_name, globals(), locals(), level=0)
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112 return module.Reader