aboutsummaryrefslogtreecommitdiff
path: root/scripts/qapi/doc.py
blob: 0ea68bf813426ae8ff9e2d86045558fee4c436dd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
#!/usr/bin/env python
# QAPI texi generator
#
# This work is licensed under the terms of the GNU LGPL, version 2+.
# See the COPYING file in the top-level directory.
"""This script produces the documentation of a qapi schema in texinfo format"""

from __future__ import print_function
import re
import qapi.common

MSG_FMT = """
@deftypefn {type} {{}} {name}

{body}
@end deftypefn

""".format

TYPE_FMT = """
@deftp {{{type}}} {name}

{body}
@end deftp

""".format

EXAMPLE_FMT = """@example
{code}
@end example
""".format


def subst_strong(doc):
    """Replaces *foo* by @strong{foo}"""
    return re.sub(r'\*([^*\n]+)\*', r'@strong{\1}', doc)


def subst_emph(doc):
    """Replaces _foo_ by @emph{foo}"""
    return re.sub(r'\b_([^_\n]+)_\b', r'@emph{\1}', doc)


def subst_vars(doc):
    """Replaces @var by @code{var}"""
    return re.sub(r'@([\w-]+)', r'@code{\1}', doc)


def subst_braces(doc):
    """Replaces {} with @{ @}"""
    return doc.replace('{', '@{').replace('}', '@}')


def texi_example(doc):
    """Format @example"""
    # TODO: Neglects to escape @ characters.
    # We should probably escape them in subst_braces(), and rename the
    # function to subst_special() or subs_texi_special().  If we do that, we
    # need to delay it until after subst_vars() in texi_format().
    doc = subst_braces(doc).strip('\n')
    return EXAMPLE_FMT(code=doc)


def texi_format(doc):
    """
    Format documentation

    Lines starting with:
    - |: generates an @example
    - =: generates @section
    - ==: generates @subsection
    - 1. or 1): generates an @enumerate @item
    - */-: generates an @itemize list
    """
    ret = ''
    doc = subst_braces(doc)
    doc = subst_vars(doc)
    doc = subst_emph(doc)
    doc = subst_strong(doc)
    inlist = ''
    lastempty = False
    for line in doc.split('\n'):
        empty = line == ''

        # FIXME: Doing this in a single if / elif chain is
        # problematic.  For instance, a line without markup terminates
        # a list if it follows a blank line (reaches the final elif),
        # but a line with some *other* markup, such as a = title
        # doesn't.
        #
        # Make sure to update section "Documentation markup" in
        # docs/devel/qapi-code-gen.txt when fixing this.
        if line.startswith('| '):
            line = EXAMPLE_FMT(code=line[2:])
        elif line.startswith('= '):
            line = '@section ' + line[2:]
        elif line.startswith('== '):
            line = '@subsection ' + line[3:]
        elif re.match(r'^([0-9]*\.) ', line):
            if not inlist:
                ret += '@enumerate\n'
                inlist = 'enumerate'
            ret += '@item\n'
            line = line[line.find(' ')+1:]
        elif re.match(r'^[*-] ', line):
            if not inlist:
                ret += '@itemize %s\n' % {'*': '@bullet',
                                          '-': '@minus'}[line[0]]
                inlist = 'itemize'
            ret += '@item\n'
            line = line[2:]
        elif lastempty and inlist:
            ret += '@end %s\n\n' % inlist
            inlist = ''

        lastempty = empty
        ret += line + '\n'

    if inlist:
        ret += '@end %s\n\n' % inlist
    return ret


def texi_body(doc):
    """Format the main documentation body"""
    return texi_format(doc.body.text)


def texi_enum_value(value):
    """Format a table of members item for an enumeration value"""
    return '@item @code{%s}\n' % value.name


def texi_member(member, suffix=''):
    """Format a table of members item for an object type member"""
    typ = member.type.doc_type()
    return '@item @code{%s%s%s}%s%s\n' % (
        member.name,
        ': ' if typ else '',
        typ if typ else '',
        ' (optional)' if member.optional else '',
        suffix)


def texi_members(doc, what, base, variants, member_func):
    """Format the table of members"""
    items = ''
    for section in doc.args.values():
        # TODO Drop fallbacks when undocumented members are outlawed
        if section.text:
            desc = texi_format(section.text)
        elif (variants and variants.tag_member == section.member
              and not section.member.type.doc_type()):
            values = section.member.type.member_names()
            members_text = ', '.join(['@t{"%s"}' % v for v in values])
            desc = 'One of ' + members_text + '\n'
        else:
            desc = 'Not documented\n'
        items += member_func(section.member) + desc
    if base:
        items += '@item The members of @code{%s}\n' % base.doc_type()
    if variants:
        for v in variants.variants:
            when = ' when @code{%s} is @t{"%s"}' % (
                variants.tag_member.name, v.name)
            if v.type.is_implicit():
                assert not v.type.base and not v.type.variants
                for m in v.type.local_members:
                    items += member_func(m, when)
            else:
                items += '@item The members of @code{%s}%s\n' % (
                    v.type.doc_type(), when)
    if not items:
        return ''
    return '\n@b{%s:}\n@table @asis\n%s@end table\n' % (what, items)


def texi_sections(doc):
    """Format additional sections following arguments"""
    body = ''
    for section in doc.sections:
        if section.name:
            # prefer @b over @strong, so txt doesn't translate it to *Foo:*
            body += '\n@b{%s:}\n' % section.name
        if section.name and section.name.startswith('Example'):
            body += texi_example(section.text)
        else:
            body += texi_format(section.text)
    return body


def texi_entity(doc, what, base=None, variants=None,
                member_func=texi_member):
    return (texi_body(doc)
            + texi_members(doc, what, base, variants, member_func)
            + texi_sections(doc))


class QAPISchemaGenDocVisitor(qapi.common.QAPISchemaVisitor):
    def __init__(self, prefix):
        self._prefix = prefix
        self._gen = qapi.common.QAPIGenDoc()
        self.cur_doc = None

    def write(self, output_dir):
        self._gen.write(output_dir, self._prefix + 'qapi-doc.texi')

    def visit_enum_type(self, name, info, values, prefix):
        doc = self.cur_doc
        self._gen.add(TYPE_FMT(type='Enum',
                               name=doc.symbol,
                               body=texi_entity(doc, 'Values',
                                                member_func=texi_enum_value)))

    def visit_object_type(self, name, info, base, members, variants):
        doc = self.cur_doc
        if base and base.is_implicit():
            base = None
        self._gen.add(TYPE_FMT(type='Object',
                               name=doc.symbol,
                               body=texi_entity(doc, 'Members',
                                                base, variants)))

    def visit_alternate_type(self, name, info, variants):
        doc = self.cur_doc
        self._gen.add(TYPE_FMT(type='Alternate',
                               name=doc.symbol,
                               body=texi_entity(doc, 'Members')))

    def visit_command(self, name, info, arg_type, ret_type,
                      gen, success_response, boxed):
        doc = self.cur_doc
        if boxed:
            body = texi_body(doc)
            body += ('\n@b{Arguments:} the members of @code{%s}\n'
                     % arg_type.name)
            body += texi_sections(doc)
        else:
            body = texi_entity(doc, 'Arguments')
        self._gen.add(MSG_FMT(type='Command',
                              name=doc.symbol,
                              body=body))

    def visit_event(self, name, info, arg_type, boxed):
        doc = self.cur_doc
        self._gen.add(MSG_FMT(type='Event',
                              name=doc.symbol,
                              body=texi_entity(doc, 'Arguments')))

    def symbol(self, doc, entity):
        if self._gen._body:
            self._gen.add('\n')
        self.cur_doc = doc
        entity.visit(self)
        self.cur_doc = None

    def freeform(self, doc):
        assert not doc.args
        if self._gen._body:
            self._gen.add('\n')
        self._gen.add(texi_body(doc) + texi_sections(doc))


def gen_doc(schema, output_dir, prefix):
    if not qapi.common.doc_required:
        return
    vis = QAPISchemaGenDocVisitor(prefix)
    vis.visit_begin(schema)
    for doc in schema.docs:
        if doc.symbol:
            vis.symbol(doc, schema.lookup_entity(doc.symbol))
        else:
            vis.freeform(doc)
    vis.write(output_dir)