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| 1 | +# Copyright (c) 2016-2025 Martin Donath <martin.donath@squidfunk.com> |
| 2 | + |
| 3 | +# Permission is hereby granted, free of charge, to any person obtaining a copy |
| 4 | +# of this software and associated documentation files (the "Software"), to |
| 5 | +# deal in the Software without restriction, including without limitation the |
| 6 | +# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 7 | +# sell copies of the Software, and to permit persons to whom the Software is |
| 8 | +# furnished to do so, subject to the following conditions: |
| 9 | + |
| 10 | +# The above copyright notice and this permission notice shall be included in |
| 11 | +# all copies or substantial portions of the Software. |
| 12 | + |
| 13 | +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 14 | +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 15 | +# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE |
| 16 | +# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 17 | +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 18 | +# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 19 | +# IN THE SOFTWARE. |
| 20 | + |
| 21 | +from __future__ import annotations |
| 22 | + |
| 23 | +import logging |
| 24 | + |
| 25 | +from material.utilities.filter import FileFilter, FilterConfig |
| 26 | +from mkdocs.structure.pages import _RelativePathTreeprocessor |
| 27 | +from markdown import Extension, Markdown |
| 28 | +from markdown.treeprocessors import Treeprocessor |
| 29 | +from mkdocs.exceptions import ConfigurationError |
| 30 | +from urllib.parse import urlparse |
| 31 | +from xml.etree.ElementTree import Element |
| 32 | + |
| 33 | +# ----------------------------------------------------------------------------- |
| 34 | +# Classes |
| 35 | +# ----------------------------------------------------------------------------- |
| 36 | + |
| 37 | +class PreviewProcessor(Treeprocessor): |
| 38 | + """ |
| 39 | + A Markdown treeprocessor to enable instant previews on links. |
| 40 | +
|
| 41 | + Note that this treeprocessor is dependent on the `relpath` treeprocessor |
| 42 | + registered programmatically by MkDocs before rendering a page. |
| 43 | + """ |
| 44 | + |
| 45 | + def __init__(self, md: Markdown, config: dict): |
| 46 | + """ |
| 47 | + Initialize the treeprocessor. |
| 48 | +
|
| 49 | + Arguments: |
| 50 | + md: The Markdown instance. |
| 51 | + config: The configuration. |
| 52 | + """ |
| 53 | + super().__init__(md) |
| 54 | + self.config = config |
| 55 | + |
| 56 | + def run(self, root: Element): |
| 57 | + """ |
| 58 | + Run the treeprocessor. |
| 59 | +
|
| 60 | + Arguments: |
| 61 | + root: The root element of the parsed Markdown document. |
| 62 | + """ |
| 63 | + at = self.md.treeprocessors.get_index_for_name("relpath") |
| 64 | + |
| 65 | + # Hack: Python Markdown has no notion of where it is, i.e., which file |
| 66 | + # is being processed. This seems to be a deliberate design decision, as |
| 67 | + # it is not possible to access the file path of the current page, but |
| 68 | + # it might also be an oversight that is now impossible to fix. However, |
| 69 | + # since this extension is only useful in the context of Material for |
| 70 | + # MkDocs, we can assume that the _RelativePathTreeprocessor is always |
| 71 | + # present, telling us the file path of the current page. If that ever |
| 72 | + # changes, we would need to wrap this extension in a plugin, but for |
| 73 | + # the time being we are sneaky and will probably get away with it. |
| 74 | + processor = self.md.treeprocessors[at] |
| 75 | + if not isinstance(processor, _RelativePathTreeprocessor): |
| 76 | + raise TypeError("Relative path processor not registered") |
| 77 | + |
| 78 | + # Normalize configurations |
| 79 | + configurations = self.config["configurations"] |
| 80 | + configurations.append({ |
| 81 | + "sources": self.config.get("sources"), |
| 82 | + "targets": self.config.get("targets") |
| 83 | + }) |
| 84 | + |
| 85 | + # Walk through all configurations - @todo refactor so that we don't |
| 86 | + # iterate multiple times over the same elements |
| 87 | + for configuration in configurations: |
| 88 | + |
| 89 | + # Skip, if the configuration defines nothing – we could also fix |
| 90 | + # this in the file filter, but we first fix it here and check if |
| 91 | + # it generalizes well enough to other inclusion/exclusion sites, |
| 92 | + # because here, it would hinder the ability to automaticaly |
| 93 | + # include all sources, while excluding specific targets. |
| 94 | + if ( |
| 95 | + not configuration.get("sources") and |
| 96 | + not configuration.get("targets") |
| 97 | + ): |
| 98 | + continue |
| 99 | + |
| 100 | + # Skip if page should not be considered |
| 101 | + filter = get_filter(configuration, "sources") |
| 102 | + if not filter(processor.file): |
| 103 | + continue |
| 104 | + |
| 105 | + # Walk through all links and add preview attributes |
| 106 | + filter = get_filter(configuration, "targets") |
| 107 | + for el in root.iter("a"): |
| 108 | + href = el.get("href") |
| 109 | + if not href: |
| 110 | + continue |
| 111 | + |
| 112 | + # Skip footnotes |
| 113 | + if "footnote-ref" in el.get("class", ""): |
| 114 | + continue |
| 115 | + |
| 116 | + # Skip external links |
| 117 | + url = urlparse(href) |
| 118 | + if url.scheme or url.netloc: |
| 119 | + continue |
| 120 | + |
| 121 | + # Add preview attribute to internal links |
| 122 | + for path in processor._possible_target_uris( |
| 123 | + processor.file, url.path, |
| 124 | + processor.config.use_directory_urls |
| 125 | + ): |
| 126 | + target = processor.files.get_file_from_path(path) |
| 127 | + if not target: |
| 128 | + continue |
| 129 | + |
| 130 | + # Include, if filter matches |
| 131 | + if filter(target): |
| 132 | + el.set("data-preview", "") |
| 133 | + |
| 134 | +# ----------------------------------------------------------------------------- |
| 135 | + |
| 136 | +class PreviewExtension(Extension): |
| 137 | + """ |
| 138 | + A Markdown extension to enable instant previews on links. |
| 139 | +
|
| 140 | + This extensions allows to automatically add the `data-preview` attribute to |
| 141 | + internal links matching specific criteria, so Material for MkDocs renders a |
| 142 | + nice preview on hover as part of a tooltip. It is the recommended way to |
| 143 | + add previews to links in a programmatic way. |
| 144 | + """ |
| 145 | + |
| 146 | + def __init__(self, *args, **kwargs): |
| 147 | + """ |
| 148 | + """ |
| 149 | + self.config = { |
| 150 | + "configurations": [[], "Filter configurations"], |
| 151 | + "sources": [{}, "Link sources"], |
| 152 | + "targets": [{}, "Link targets"] |
| 153 | + } |
| 154 | + super().__init__(*args, **kwargs) |
| 155 | + |
| 156 | + def extendMarkdown(self, md: Markdown): |
| 157 | + """ |
| 158 | + Register Markdown extension. |
| 159 | +
|
| 160 | + Arguments: |
| 161 | + md: The Markdown instance. |
| 162 | + """ |
| 163 | + md.registerExtension(self) |
| 164 | + |
| 165 | + # Create and register treeprocessor - we use the same priority as the |
| 166 | + # `relpath` treeprocessor, the latter of which is guaranteed to run |
| 167 | + # after our treeprocessor, so we can check the original Markdown URIs |
| 168 | + # before they are resolved to URLs. |
| 169 | + processor = PreviewProcessor(md, self.getConfigs()) |
| 170 | + md.treeprocessors.register(processor, "preview", 0) |
| 171 | + |
| 172 | +# ----------------------------------------------------------------------------- |
| 173 | +# Functions |
| 174 | +# ----------------------------------------------------------------------------- |
| 175 | + |
| 176 | +def get_filter(settings: dict, key: str): |
| 177 | + """ |
| 178 | + Get file filter from settings. |
| 179 | +
|
| 180 | + Arguments: |
| 181 | + settings: The settings. |
| 182 | + key: The key in the settings. |
| 183 | +
|
| 184 | + Returns: |
| 185 | + The file filter. |
| 186 | + """ |
| 187 | + config = FilterConfig() |
| 188 | + config.load_dict(settings.get(key) or {}) |
| 189 | + |
| 190 | + # Validate filter configuration |
| 191 | + errors, warnings = config.validate() |
| 192 | + for _, w in warnings: |
| 193 | + log.warning( |
| 194 | + f"Error reading filter configuration in '{key}':\n" |
| 195 | + f"{w}" |
| 196 | + ) |
| 197 | + for _, e in errors: |
| 198 | + raise ConfigurationError( |
| 199 | + f"Error reading filter configuration in '{key}':\n" |
| 200 | + f"{e}" |
| 201 | + ) |
| 202 | + |
| 203 | + # Return file filter |
| 204 | + return FileFilter(config = config) # type: ignore |
| 205 | + |
| 206 | +def makeExtension(**kwargs): |
| 207 | + """ |
| 208 | + Register Markdown extension. |
| 209 | +
|
| 210 | + Arguments: |
| 211 | + **kwargs: Configuration options. |
| 212 | +
|
| 213 | + Returns: |
| 214 | + The Markdown extension. |
| 215 | + """ |
| 216 | + return PreviewExtension(**kwargs) |
| 217 | + |
| 218 | +# ----------------------------------------------------------------------------- |
| 219 | +# Data |
| 220 | +# ----------------------------------------------------------------------------- |
| 221 | + |
| 222 | +# Set up logging |
| 223 | +log = logging.getLogger("mkdocs.material.extensions.preview") |
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