xref: /openbmc/qemu/docs/sphinx/kerneldoc.py (revision 6eece7f5) 
1# coding=utf-8
2#
3# Copyright © 2016 Intel Corporation
4#
5# Permission is hereby granted, free of charge, to any person obtaining a
6# copy of this software and associated documentation files (the "Software"),
7# to deal in the Software without restriction, including without limitation
8# the rights to use, copy, modify, merge, publish, distribute, sublicense,
9# and/or sell copies of the Software, and to permit persons to whom the
10# Software is furnished to do so, subject to the following conditions:
11#
12# The above copyright notice and this permission notice (including the next
13# paragraph) shall be included in all copies or substantial portions of the
14# Software.
15#
16# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22# IN THE SOFTWARE.
23#
24# Authors:
25#    Jani Nikula <jani.nikula@intel.com>
26#
27# Please make sure this works on both python2 and python3.
28#
29
30import codecs
31import os
32import subprocess
33import sys
34import re
35import glob
36
37from docutils import nodes, statemachine
38from docutils.statemachine import ViewList
39from docutils.parsers.rst import directives, Directive
40
41#
42# AutodocReporter is only good up to Sphinx 1.7
43#
44import sphinx
45
46Use_SSI = sphinx.__version__[:3] >= '1.7'
47if Use_SSI:
48    from sphinx.util.docutils import switch_source_input
49else:
50    from sphinx.ext.autodoc import AutodocReporter
51
52import kernellog
53
54__version__  = '1.0'
55
56class KernelDocDirective(Directive):
57    """Extract kernel-doc comments from the specified file"""
58    required_argument = 1
59    optional_arguments = 4
60    option_spec = {
61        'doc': directives.unchanged_required,
62        'functions': directives.unchanged,
63        'export': directives.unchanged,
64        'internal': directives.unchanged,
65    }
66    has_content = False
67
68    def run(self):
69        env = self.state.document.settings.env
70        cmd = env.config.kerneldoc_bin + ['-rst', '-enable-lineno']
71
72        # Pass the version string to kernel-doc, as it needs to use a different
73        # dialect, depending what the C domain supports for each specific
74        # Sphinx versions
75        cmd += ['-sphinx-version', sphinx.__version__]
76
77        # Pass through the warnings-as-errors flag
78        if env.config.kerneldoc_werror:
79            cmd += ['-Werror']
80
81        filename = env.config.kerneldoc_srctree + '/' + self.arguments[0]
82        export_file_patterns = []
83
84        # Tell sphinx of the dependency
85        env.note_dependency(os.path.abspath(filename))
86
87        tab_width = self.options.get('tab-width', self.state.document.settings.tab_width)
88
89        # FIXME: make this nicer and more robust against errors
90        if 'export' in self.options:
91            cmd += ['-export']
92            export_file_patterns = str(self.options.get('export')).split()
93        elif 'internal' in self.options:
94            cmd += ['-internal']
95            export_file_patterns = str(self.options.get('internal')).split()
96        elif 'doc' in self.options:
97            cmd += ['-function', str(self.options.get('doc'))]
98        elif 'functions' in self.options:
99            functions = self.options.get('functions').split()
100            if functions:
101                for f in functions:
102                    cmd += ['-function', f]
103            else:
104                cmd += ['-no-doc-sections']
105
106        for pattern in export_file_patterns:
107            for f in glob.glob(env.config.kerneldoc_srctree + '/' + pattern):
108                env.note_dependency(os.path.abspath(f))
109                cmd += ['-export-file', f]
110
111        cmd += [filename]
112
113        try:
114            kernellog.verbose(env.app,
115                              'calling kernel-doc \'%s\'' % (" ".join(cmd)))
116
117            p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
118            out, err = p.communicate()
119
120            out, err = codecs.decode(out, 'utf-8'), codecs.decode(err, 'utf-8')
121
122            if p.returncode != 0:
123                sys.stderr.write(err)
124
125                kernellog.warn(env.app,
126                               'kernel-doc \'%s\' failed with return code %d' % (" ".join(cmd), p.returncode))
127                return [nodes.error(None, nodes.paragraph(text = "kernel-doc missing"))]
128            elif env.config.kerneldoc_verbosity > 0:
129                sys.stderr.write(err)
130
131            lines = statemachine.string2lines(out, tab_width, convert_whitespace=True)
132            result = ViewList()
133
134            lineoffset = 0;
135            line_regex = re.compile("^#define LINENO ([0-9]+)$")
136            for line in lines:
137                match = line_regex.search(line)
138                if match:
139                    # sphinx counts lines from 0
140                    lineoffset = int(match.group(1)) - 1
141                    # we must eat our comments since the upset the markup
142                else:
143                    result.append(line, filename, lineoffset)
144                    lineoffset += 1
145
146            node = nodes.section()
147            self.do_parse(result, node)
148
149            return node.children
150
151        except Exception as e:  # pylint: disable=W0703
152            kernellog.warn(env.app, 'kernel-doc \'%s\' processing failed with: %s' %
153                           (" ".join(cmd), str(e)))
154            return [nodes.error(None, nodes.paragraph(text = "kernel-doc missing"))]
155
156    def do_parse(self, result, node):
157        if Use_SSI:
158            with switch_source_input(self.state, result):
159                self.state.nested_parse(result, 0, node, match_titles=1)
160        else:
161            save = self.state.memo.title_styles, self.state.memo.section_level, self.state.memo.reporter
162            self.state.memo.reporter = AutodocReporter(result, self.state.memo.reporter)
163            self.state.memo.title_styles, self.state.memo.section_level = [], 0
164            try:
165                self.state.nested_parse(result, 0, node, match_titles=1)
166            finally:
167                self.state.memo.title_styles, self.state.memo.section_level, self.state.memo.reporter = save
168
169
170def setup(app):
171    app.add_config_value('kerneldoc_bin', None, 'env')
172    app.add_config_value('kerneldoc_srctree', None, 'env')
173    app.add_config_value('kerneldoc_verbosity', 1, 'env')
174    app.add_config_value('kerneldoc_werror', 0, 'env')
175
176    app.add_directive('kernel-doc', KernelDocDirective)
177
178    return dict(
179        version = __version__,
180        parallel_read_safe = True,
181        parallel_write_safe = True
182    )
183