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# Copyright 2012-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"). You # may not use this file except in compliance with the License. A copy of # the License is located at # # http://aws.amazon.com/apache2.0/ # # or in the "license" file accompanying this file. This file is # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF # ANY KIND, either express or implied. See the License for the specific # language governing permissions and limitations under the License. from html.parser import HTMLParser from itertools import zip_longest PRIORITY_PARENT_TAGS = ('code', 'a') OMIT_NESTED_TAGS = ('span', 'i', 'code', 'a') OMIT_SELF_TAGS = ('i', 'b') HTML_BLOCK_DISPLAY_TAGS = ('p', 'note', 'ul', 'li') class DocStringParser(HTMLParser): """ A simple HTML parser. Focused on converting the subset of HTML that appears in the documentation strings of the JSON models into simple ReST format. """ def __init__(self, doc): self.tree = None self.doc = doc super().__init__() def reset(self): HTMLParser.reset(self) self.tree = HTMLTree(self.doc) def feed(self, data): super().feed(data) self.tree.write() self.tree = HTMLTree(self.doc) def close(self): super().close() # Write if there is anything remaining. self.tree.write() self.tree = HTMLTree(self.doc) def handle_starttag(self, tag, attrs): self.tree.add_tag(tag, attrs=attrs) def handle_endtag(self, tag): self.tree.add_tag(tag, is_start=False) def handle_data(self, data): self.tree.add_data(data) class HTMLTree: """ A tree which handles HTML nodes. Designed to work with a python HTML parser, meaning that the current_node will be the most recently opened tag. When a tag is closed, the current_node moves up to the parent node. """ def __init__(self, doc): self.doc = doc self.head = StemNode() self.current_node = self.head self.unhandled_tags = [] def add_tag(self, tag, attrs=None, is_start=True): if not self._doc_has_handler(tag, is_start): self.unhandled_tags.append(tag) return if is_start: node = TagNode(tag, attrs) self.current_node.add_child(node) self.current_node = node else: self.current_node = self.current_node.parent def _doc_has_handler(self, tag, is_start): if is_start: handler_name = 'start_%s' % tag else: handler_name = 'end_%s' % tag return hasattr(self.doc.style, handler_name) def add_data(self, data): self.current_node.add_child(DataNode(data)) def write(self): self.head.write(self.doc) class Node: def __init__(self, parent=None): self.parent = parent def write(self, doc): raise NotImplementedError class StemNode(Node): def __init__(self, parent=None): super().__init__(parent) self.children = [] def add_child(self, child): child.parent = self self.children.append(child) def write(self, doc): self.collapse_whitespace() self._write_children(doc) def _write_children(self, doc): for child, next_child in zip_longest(self.children, self.children[1:]): if isinstance(child, TagNode) and next_child is not None: child.write(doc, next_child) else: child.write(doc) def is_whitespace(self): return all(child.is_whitespace() for child in self.children) def startswith_whitespace(self): return self.children and self.children[0].startswith_whitespace() def endswith_whitespace(self): return self.children and self.children[-1].endswith_whitespace() def lstrip(self): while self.children and self.children[0].is_whitespace(): self.children = self.children[1:] if self.children: self.children[0].lstrip() def rstrip(self): while self.children and self.children[-1].is_whitespace(): self.children = self.children[:-1] if self.children: self.children[-1].rstrip() def collapse_whitespace(self): """Remove collapsible white-space from HTML. HTML in docstrings often contains extraneous white-space around tags, for readability. Browsers would collapse this white-space before rendering. If not removed before conversion to RST where white-space is part of the syntax, for example for indentation, it can result in incorrect output. """ self.lstrip() self.rstrip() for child in self.children: child.collapse_whitespace() class TagNode(StemNode): """ A generic Tag node. It will verify that handlers exist before writing. """ def __init__(self, tag, attrs=None, parent=None): super().__init__(parent) self.attrs = attrs self.tag = tag def _has_nested_tags(self): # Returns True if any children are TagNodes and False otherwise. return any(isinstance(child, TagNode) for child in self.children) def write(self, doc, next_child=None): prioritize_nested_tags = ( self.tag in OMIT_SELF_TAGS and self._has_nested_tags() ) prioritize_parent_tag = ( isinstance(self.parent, TagNode) and self.parent.tag in PRIORITY_PARENT_TAGS and self.tag in OMIT_NESTED_TAGS ) if prioritize_nested_tags or prioritize_parent_tag: self._write_children(doc) return self._write_start(doc) self._write_children(doc) self._write_end(doc, next_child) def collapse_whitespace(self): """Remove collapsible white-space. All tags collapse internal whitespace. Block-display HTML tags also strip all leading and trailing whitespace. Approximately follows the specification used in browsers: https://www.w3.org/TR/css-text-3/#white-space-rules https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Whitespace """ if self.tag in HTML_BLOCK_DISPLAY_TAGS: self.lstrip() self.rstrip() # Collapse whitespace in situations like `` foo`` into # `` foo``. for prev, cur in zip(self.children[:-1], self.children[1:]): if ( isinstance(prev, DataNode) and prev.endswith_whitespace() and cur.startswith_whitespace() ): cur.lstrip() # Same logic, but for situations like ``bar ``: for cur, nxt in zip(self.children[:-1], self.children[1:]): if ( isinstance(nxt, DataNode) and cur.endswith_whitespace() and nxt.startswith_whitespace() ): cur.rstrip() # Recurse into children for child in self.children: child.collapse_whitespace() def _write_start(self, doc): handler_name = 'start_%s' % self.tag if hasattr(doc.style, handler_name): getattr(doc.style, handler_name)(self.attrs) def _write_end(self, doc, next_child): handler_name = 'end_%s' % self.tag if hasattr(doc.style, handler_name): if handler_name == 'end_a': # We use lookahead to determine if a space is needed after a link node getattr(doc.style, handler_name)(next_child) else: getattr(doc.style, handler_name)() class DataNode(Node): """ A Node that contains only string data. """ def __init__(self, data, parent=None): super().__init__(parent) if not isinstance(data, str): raise ValueError("Expecting string type, %s given." % type(data)) self._leading_whitespace = '' self._trailing_whitespace = '' self._stripped_data = '' if data == '': return if data.isspace(): self._trailing_whitespace = data return first_non_space = next( idx for idx, ch in enumerate(data) if not ch.isspace() ) last_non_space = len(data) - next( idx for idx, ch in enumerate(reversed(data)) if not ch.isspace() ) self._leading_whitespace = data[:first_non_space] self._trailing_whitespace = data[last_non_space:] self._stripped_data = data[first_non_space:last_non_space] @property def data(self): return ( f'{self._leading_whitespace}{self._stripped_data}' f'{self._trailing_whitespace}' ) def is_whitespace(self): return self._stripped_data == '' and ( self._leading_whitespace != '' or self._trailing_whitespace != '' ) def startswith_whitespace(self): return self._leading_whitespace != '' or ( self._stripped_data == '' and self._trailing_whitespace != '' ) def endswith_whitespace(self): return self._trailing_whitespace != '' or ( self._stripped_data == '' and self._leading_whitespace != '' ) def lstrip(self): if self._leading_whitespace != '': self._leading_whitespace = '' elif self._stripped_data == '': self.rstrip() def rstrip(self): if self._trailing_whitespace != '': self._trailing_whitespace = '' elif self._stripped_data == '': self.lstrip() def collapse_whitespace(self): """Noop, ``DataNode.write`` always collapses whitespace""" return def write(self, doc): words = doc.translate_words(self._stripped_data.split()) str_data = ( f'{self._leading_whitespace}{" ".join(words)}' f'{self._trailing_whitespace}' ) if str_data != '': doc.handle_data(str_data)