aboutsummaryrefslogtreecommitdiff
path: root/scripts/qapi/common.py
blob: 3d7272a7023da6fc9c68ae99044e60c85c080719 (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
#
# QAPI helper library
#
# Copyright IBM, Corp. 2011
# Copyright (c) 2013-2018 Red Hat Inc.
#
# Authors:
#  Anthony Liguori <aliguori@us.ibm.com>
#  Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.
# See the COPYING file in the top-level directory.

import re
from typing import (
    Any,
    Dict,
    Match,
    Optional,
    Union,
)


#: Magic string that gets removed along with all space to its right.
EATSPACE = '\033EATSPACE.'
POINTER_SUFFIX = ' *' + EATSPACE


def camel_to_upper(value: str) -> str:
    """
    Converts CamelCase to CAMEL_CASE.

    Examples::

        ENUMName -> ENUM_NAME
        EnumName1 -> ENUM_NAME1
        ENUM_NAME -> ENUM_NAME
        ENUM_NAME1 -> ENUM_NAME1
        ENUM_Name2 -> ENUM_NAME2
        ENUM24_Name -> ENUM24_NAME
    """
    c_fun_str = c_name(value, False)
    if value.isupper():
        return c_fun_str

    new_name = ''
    length = len(c_fun_str)
    for i in range(length):
        char = c_fun_str[i]
        # When char is upper case and no '_' appears before, do more checks
        if char.isupper() and (i > 0) and c_fun_str[i - 1] != '_':
            if i < length - 1 and c_fun_str[i + 1].islower():
                new_name += '_'
            elif c_fun_str[i - 1].isdigit():
                new_name += '_'
        new_name += char
    return new_name.lstrip('_').upper()


def c_enum_const(type_name: str,
                 const_name: str,
                 prefix: Optional[str] = None) -> str:
    """
    Generate a C enumeration constant name.

    :param type_name: The name of the enumeration.
    :param const_name: The name of this constant.
    :param prefix: Optional, prefix that overrides the type_name.
    """
    if prefix is not None:
        type_name = prefix
    return camel_to_upper(type_name) + '_' + c_name(const_name, False).upper()


def c_name(name: str, protect: bool = True) -> str:
    """
    Map ``name`` to a valid C identifier.

    Used for converting 'name' from a 'name':'type' qapi definition
    into a generated struct member, as well as converting type names
    into substrings of a generated C function name.

    '__a.b_c' -> '__a_b_c', 'x-foo' -> 'x_foo'
    protect=True: 'int' -> 'q_int'; protect=False: 'int' -> 'int'

    :param name: The name to map.
    :param protect: If true, avoid returning certain ticklish identifiers
                    (like C keywords) by prepending ``q_``.
    """
    # ANSI X3J11/88-090, 3.1.1
    c89_words = set(['auto', 'break', 'case', 'char', 'const', 'continue',
                     'default', 'do', 'double', 'else', 'enum', 'extern',
                     'float', 'for', 'goto', 'if', 'int', 'long', 'register',
                     'return', 'short', 'signed', 'sizeof', 'static',
                     'struct', 'switch', 'typedef', 'union', 'unsigned',
                     'void', 'volatile', 'while'])
    # ISO/IEC 9899:1999, 6.4.1
    c99_words = set(['inline', 'restrict', '_Bool', '_Complex', '_Imaginary'])
    # ISO/IEC 9899:2011, 6.4.1
    c11_words = set(['_Alignas', '_Alignof', '_Atomic', '_Generic',
                     '_Noreturn', '_Static_assert', '_Thread_local'])
    # GCC http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/C-Extensions.html
    # excluding _.*
    gcc_words = set(['asm', 'typeof'])
    # C++ ISO/IEC 14882:2003 2.11
    cpp_words = set(['bool', 'catch', 'class', 'const_cast', 'delete',
                     'dynamic_cast', 'explicit', 'false', 'friend', 'mutable',
                     'namespace', 'new', 'operator', 'private', 'protected',
                     'public', 'reinterpret_cast', 'static_cast', 'template',
                     'this', 'throw', 'true', 'try', 'typeid', 'typename',
                     'using', 'virtual', 'wchar_t',
                     # alternative representations
                     'and', 'and_eq', 'bitand', 'bitor', 'compl', 'not',
                     'not_eq', 'or', 'or_eq', 'xor', 'xor_eq'])
    # namespace pollution:
    polluted_words = set(['unix', 'errno', 'mips', 'sparc', 'i386'])
    name = re.sub(r'[^A-Za-z0-9_]', '_', name)
    if protect and (name in (c89_words | c99_words | c11_words | gcc_words
                             | cpp_words | polluted_words)
                    or name[0].isdigit()):
        return 'q_' + name
    return name


class Indentation:
    """
    Indentation level management.

    :param initial: Initial number of spaces, default 0.
    """
    def __init__(self, initial: int = 0) -> None:
        self._level = initial

    def __int__(self) -> int:
        return self._level

    def __repr__(self) -> str:
        return "{}({:d})".format(type(self).__name__, self._level)

    def __str__(self) -> str:
        """Return the current indentation as a string of spaces."""
        return ' ' * self._level

    def __bool__(self) -> bool:
        """True when there is a non-zero indentation."""
        return bool(self._level)

    def increase(self, amount: int = 4) -> None:
        """Increase the indentation level by ``amount``, default 4."""
        self._level += amount

    def decrease(self, amount: int = 4) -> None:
        """Decrease the indentation level by ``amount``, default 4."""
        if self._level < amount:
            raise ArithmeticError(
                f"Can't remove {amount:d} spaces from {self!r}")
        self._level -= amount


#: Global, current indent level for code generation.
indent = Indentation()


def cgen(code: str, **kwds: object) -> str:
    """
    Generate ``code`` with ``kwds`` interpolated.

    Obey `indent`, and strip `EATSPACE`.
    """
    raw = code % kwds
    if indent:
        raw = re.sub(r'^(?!(#|$))', str(indent), raw, flags=re.MULTILINE)
    return re.sub(re.escape(EATSPACE) + r' *', '', raw)


def mcgen(code: str, **kwds: object) -> str:
    if code[0] == '\n':
        code = code[1:]
    return cgen(code, **kwds)


def c_fname(filename: str) -> str:
    return re.sub(r'[^A-Za-z0-9_]', '_', filename)


def guardstart(name: str) -> str:
    return mcgen('''
#ifndef %(name)s
#define %(name)s

''',
                 name=c_fname(name).upper())


def guardend(name: str) -> str:
    return mcgen('''

#endif /* %(name)s */
''',
                 name=c_fname(name).upper())


def cgen_ifcond(ifcond: Union[str, Dict[str, Any]]) -> str:
    if not ifcond:
        return ''
    if isinstance(ifcond, str):
        return ifcond

    oper, operands = next(iter(ifcond.items()))
    oper = {'all': '&&'}[oper]
    operands = [cgen_ifcond(o) for o in operands]
    return '(' + (') ' + oper + ' (').join(operands) + ')'


def docgen_ifcond(ifcond: Union[str, Dict[str, Any]]) -> str:
    # TODO Doc generated for conditions needs polish
    if not ifcond:
        return ''
    if isinstance(ifcond, str):
        return ifcond

    oper, operands = next(iter(ifcond.items()))
    oper = {'all': ' and '}[oper]
    operands = [docgen_ifcond(o) for o in operands]
    return '(' + oper.join(operands) + ')'


def gen_if(cond: str) -> str:
    if not cond:
        return ''
    return mcgen('''
#if %(cond)s
''', cond=cond)


def gen_endif(cond: str) -> str:
    if not cond:
        return ''
    return mcgen('''
#endif /* %(cond)s */
''', cond=cond)


def must_match(pattern: str, string: str) -> Match[str]:
    match = re.match(pattern, string)
    assert match is not None
    return match