Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/docutils/readers/__init__.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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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 |