Mercurial > libervia-backend
annotate libervia/backend/bridge/bridge_constructor/base_constructor.py @ 4281:9e63e02318ec
core: show warning instead of exception in case of missing dependency when loading plugins
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 12 Jul 2024 18:53:00 +0200 |
| parents | 4cf98f506269 |
| children |
| rev | line source |
|---|---|
| 3028 | 1 #!/usr/bin/env python3 |
| 3137 | 2 |
| 2085 | 3 |
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4 # Libervia: an XMPP client |
| 3479 | 5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
| 2085 | 6 |
| 7 # This program is free software: you can redistribute it and/or modify | |
| 8 # it under the terms of the GNU Affero General Public License as published by | |
| 9 # the Free Software Foundation, either version 3 of the License, or | |
| 10 # (at your option) any later version. | |
| 11 | |
| 12 # This program is distributed in the hope that it will be useful, | |
| 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 # GNU Affero General Public License for more details. | |
| 16 | |
| 17 # You should have received a copy of the GNU Affero General Public License | |
| 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 """base constructor class""" | |
| 21 | |
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22 from libervia.backend.bridge.bridge_constructor.constants import Const as C |
| 3028 | 23 from configparser import NoOptionError |
| 2085 | 24 import sys |
| 25 import os | |
| 26 import os.path | |
| 27 import re | |
| 28 from importlib import import_module | |
| 29 | |
| 30 | |
| 31 class ParseError(Exception): | |
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32 # Used when the signature parsing is going wrong (invalid signature ?) |
| 2085 | 33 pass |
| 34 | |
| 35 | |
| 36 class Constructor(object): | |
| 37 NAME = None # used in arguments parsing, filename will be used if not set | |
| 38 # following attribute are used by default generation method | |
| 39 # they can be set to dict of strings using python formatting syntax | |
| 40 # dict keys will be used to select part to replace (e.g. "signals" key will | |
| 41 # replace ##SIGNALS_PART## in template), while the value is the format | |
| 42 # keys starting with "signal" will be used for signals, while ones starting with | |
| 43 # "method" will be used for methods | |
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44 # check D-Bus constructor for an example |
| 2085 | 45 CORE_FORMATS = None |
| 46 CORE_TEMPLATE = None | |
| 47 CORE_DEST = None | |
| 48 FRONTEND_FORMATS = None | |
| 49 FRONTEND_TEMPLATE = None | |
| 50 FRONTEND_DEST = None | |
| 51 | |
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52 # set to False if your bridge needs only core |
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53 FRONTEND_ACTIVATE = True |
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54 |
| 2085 | 55 def __init__(self, bridge_template, options): |
| 56 self.bridge_template = bridge_template | |
| 57 self.args = options | |
| 58 | |
| 59 @property | |
| 60 def constructor_dir(self): | |
| 61 constructor_mod = import_module(self.__module__) | |
| 62 return os.path.dirname(constructor_mod.__file__) | |
| 63 | |
| 64 def getValues(self, name): | |
| 65 """Return values of a function in a dict | |
| 66 @param name: Name of the function to get | |
| 67 @return: dict, each key has the config value or None if the value is not set""" | |
| 68 function = {} | |
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69 for option in ["type", "category", "sig_in", "sig_out", "doc"]: |
| 2085 | 70 try: |
| 71 value = self.bridge_template.get(name, option) | |
| 72 except NoOptionError: | |
| 73 value = None | |
| 74 function[option] = value | |
| 75 return function | |
| 76 | |
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77 def get_default(self, name): |
| 2085 | 78 """Return default values of a function in a dict |
| 79 @param name: Name of the function to get | |
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80 @return: dict, each key is the integer param number (no key if no default value) |
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81 """ |
| 2085 | 82 default_dict = {} |
| 83 def_re = re.compile(r"param_(\d+)_default") | |
| 84 | |
| 85 for option in self.bridge_template.options(name): | |
| 86 match = def_re.match(option) | |
| 87 if match: | |
| 88 try: | |
| 89 idx = int(match.group(1)) | |
| 90 except ValueError: | |
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91 raise ParseError( |
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92 "Invalid value [%s] for parameter number" % match.group(1) |
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93 ) |
| 2085 | 94 default_dict[idx] = self.bridge_template.get(name, option) |
| 95 | |
| 96 return default_dict | |
| 97 | |
| 98 def getFlags(self, name): | |
| 99 """Return list of flags set for this function | |
| 100 | |
| 101 @param name: Name of the function to get | |
| 102 @return: List of flags (string) | |
| 103 """ | |
| 104 flags = [] | |
| 105 for option in self.bridge_template.options(name): | |
| 106 if option in C.DECLARATION_FLAGS: | |
| 107 flags.append(option) | |
| 108 return flags | |
| 109 | |
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110 def get_arguments_doc(self, name): |
| 2085 | 111 """Return documentation of arguments |
| 112 @param name: Name of the function to get | |
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113 @return: dict, each key is the integer param number (no key if no argument doc), value is a tuple (name, doc) |
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114 """ |
| 2085 | 115 doc_dict = {} |
| 116 option_re = re.compile(r"doc_param_(\d+)") | |
| 117 value_re = re.compile(r"^(\w+): (.*)$", re.MULTILINE | re.DOTALL) | |
| 118 for option in self.bridge_template.options(name): | |
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119 if option == "doc_return": |
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120 doc_dict["return"] = self.bridge_template.get(name, option) |
| 2085 | 121 continue |
| 122 match = option_re.match(option) | |
| 123 if match: | |
| 124 try: | |
| 125 idx = int(match.group(1)) | |
| 126 except ValueError: | |
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127 raise ParseError( |
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128 "Invalid value [%s] for parameter number" % match.group(1) |
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129 ) |
| 2085 | 130 value_match = value_re.match(self.bridge_template.get(name, option)) |
| 131 if not value_match: | |
| 132 raise ParseError("Invalid value for parameter doc [%i]" % idx) | |
| 133 doc_dict[idx] = (value_match.group(1), value_match.group(2)) | |
| 134 return doc_dict | |
| 135 | |
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136 def get_doc(self, name): |
| 2085 | 137 """Return documentation of the method |
| 138 @param name: Name of the function to get | |
| 139 @return: string documentation, or None""" | |
| 140 if self.bridge_template.has_option(name, "doc"): | |
| 141 return self.bridge_template.get(name, "doc") | |
| 142 return None | |
| 143 | |
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144 def arguments_parser(self, signature): |
| 2085 | 145 """Generator which return individual arguments signatures from a global signature""" |
| 146 start = 0 | |
| 147 i = 0 | |
| 148 | |
| 149 while i < len(signature): | |
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150 if signature[i] not in [ |
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151 "b", |
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152 "y", |
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153 "n", |
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154 "i", |
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155 "x", |
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156 "q", |
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157 "u", |
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158 "t", |
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159 "d", |
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160 "s", |
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161 "a", |
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162 ]: |
| 2085 | 163 raise ParseError("Unmanaged attribute type [%c]" % signature[i]) |
| 164 | |
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165 if signature[i] == "a": |
| 2085 | 166 i += 1 |
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167 if ( |
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168 signature[i] != "{" and signature[i] != "(" |
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169 ): # FIXME: must manage tuples out of arrays |
| 2085 | 170 i += 1 |
| 171 yield signature[start:i] | |
| 172 start = i | |
| 173 continue # we have a simple type for the array | |
| 174 opening_car = signature[i] | |
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175 assert opening_car in ["{", "("] |
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176 closing_car = "}" if opening_car == "{" else ")" |
| 2085 | 177 opening_count = 1 |
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178 while True: # we have a dict or a list of tuples |
| 2085 | 179 i += 1 |
| 180 if i >= len(signature): | |
| 181 raise ParseError("missing }") | |
| 182 if signature[i] == opening_car: | |
| 183 opening_count += 1 | |
| 184 if signature[i] == closing_car: | |
| 185 opening_count -= 1 | |
| 186 if opening_count == 0: | |
| 187 break | |
| 188 i += 1 | |
| 189 yield signature[start:i] | |
| 190 start = i | |
| 191 | |
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192 def get_arguments(self, signature, name=None, default=None, unicode_protect=False): |
| 2085 | 193 """Return arguments to user given a signature |
| 194 | |
| 195 @param signature: signature in the short form (using s,a,i,b etc) | |
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196 @param name: dictionary of arguments name like given by get_arguments_doc |
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197 @param default: dictionary of default values, like given by get_default |
| 2085 | 198 @param unicode_protect: activate unicode protection on strings (return strings as unicode(str)) |
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199 @return (str): arguments that correspond to a signature (e.g.: "sss" return "arg1, arg2, arg3") |
| 2085 | 200 """ |
| 201 idx = 0 | |
| 202 attr_string = [] | |
| 203 | |
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204 for arg in self.arguments_parser(signature): |
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205 attr_string.append( |
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206 ( |
| 3028 | 207 "str(%(name)s)%(default)s" |
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208 if (unicode_protect and arg == "s") |
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209 else "%(name)s%(default)s" |
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210 ) |
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211 % { |
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212 "name": name[idx][0] if (name and idx in name) else "arg_%i" % idx, |
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213 "default": "=" + default[idx] if (default and idx in default) else "", |
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214 } |
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215 ) |
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216 # give arg_1, arg2, etc or name1, name2=default, etc. |
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217 # give unicode(arg_1), unicode(arg_2), etc. if unicode_protect is set and arg is a string |
| 2085 | 218 idx += 1 |
| 219 | |
| 220 return ", ".join(attr_string) | |
| 221 | |
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222 def get_template_path(self, template_file): |
| 2085 | 223 """return template path corresponding to file name |
| 224 | |
| 225 @param template_file(str): name of template file | |
| 226 """ | |
| 227 return os.path.join(self.constructor_dir, template_file) | |
| 228 | |
| 229 def core_completion_method(self, completion, function, default, arg_doc, async_): | |
| 230 """override this method to extend completion""" | |
| 231 pass | |
| 232 | |
| 233 def core_completion_signal(self, completion, function, default, arg_doc, async_): | |
| 234 """override this method to extend completion""" | |
| 235 pass | |
| 236 | |
| 237 def frontend_completion_method(self, completion, function, default, arg_doc, async_): | |
| 238 """override this method to extend completion""" | |
| 239 pass | |
| 240 | |
| 241 def frontend_completion_signal(self, completion, function, default, arg_doc, async_): | |
| 242 """override this method to extend completion""" | |
| 243 pass | |
| 244 | |
| 245 def generate(self, side): | |
| 246 """generate bridge | |
| 247 | |
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248 call generate_core_side or generateFrontendSide if they exists |
| 2085 | 249 else call generic self._generate method |
| 250 """ | |
| 251 try: | |
| 252 if side == "core": | |
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253 method = self.generate_core_side |
| 2085 | 254 elif side == "frontend": |
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255 if not self.FRONTEND_ACTIVATE: |
| 3028 | 256 print("This constructor only handle core, please use core side") |
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257 sys.exit(1) |
| 2085 | 258 method = self.generateFrontendSide |
| 259 except AttributeError: | |
| 260 self._generate(side) | |
| 261 else: | |
| 262 method() | |
| 263 | |
| 264 def _generate(self, side): | |
| 265 """generate the backend | |
| 266 | |
| 267 this is a generic method which will use formats found in self.CORE_SIGNAL_FORMAT | |
| 268 and self.CORE_METHOD_FORMAT (standard format method will be used) | |
| 269 @param side(str): core or frontend | |
| 270 """ | |
| 271 side_vars = [] | |
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272 for var in ("FORMATS", "TEMPLATE", "DEST"): |
| 2085 | 273 attr = "{}_{}".format(side.upper(), var) |
| 274 value = getattr(self, attr) | |
| 275 if value is None: | |
| 276 raise NotImplementedError | |
| 277 side_vars.append(value) | |
| 278 | |
| 279 FORMATS, TEMPLATE, DEST = side_vars | |
| 280 del side_vars | |
| 281 | |
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282 parts = {part.upper(): [] for part in FORMATS} |
| 2085 | 283 sections = self.bridge_template.sections() |
| 284 sections.sort() | |
| 285 for section in sections: | |
| 286 function = self.getValues(section) | |
| 3028 | 287 print(("Adding %s %s" % (section, function["type"]))) |
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288 default = self.get_default(section) |
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289 arg_doc = self.get_arguments_doc(section) |
| 2085 | 290 async_ = "async" in self.getFlags(section) |
| 291 completion = { | |
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292 "sig_in": function["sig_in"] or "", |
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293 "sig_out": function["sig_out"] or "", |
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294 "category": "plugin" if function["category"] == "plugin" else "core", |
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295 "name": section, |
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296 # arguments with default values |
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297 "args": self.get_arguments( |
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298 function["sig_in"], name=arg_doc, default=default |
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299 ), |
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300 "args_no_default": self.get_arguments(function["sig_in"], name=arg_doc), |
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301 } |
| 2085 | 302 |
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303 extend_method = getattr( |
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304 self, "{}_completion_{}".format(side, function["type"]) |
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305 ) |
| 2085 | 306 extend_method(completion, function, default, arg_doc, async_) |
| 307 | |
| 3028 | 308 for part, fmt in FORMATS.items(): |
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309 if part.startswith(function["type"]) or part.startswith( |
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310 f"async_{function['type']}" |
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311 ): |
| 2085 | 312 parts[part.upper()].append(fmt.format(**completion)) |
| 313 | |
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314 # at this point, signals_part, methods_part and direct_calls should be filled, |
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315 # we just have to place them in the right part of the template |
| 2085 | 316 bridge = [] |
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317 const_override = { |
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318 env[len(C.ENV_OVERRIDE) :]: v |
| 3028 | 319 for env, v in os.environ.items() |
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320 if env.startswith(C.ENV_OVERRIDE) |
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321 } |
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322 template_path = self.get_template_path(TEMPLATE) |
| 2085 | 323 try: |
| 324 with open(template_path) as template: | |
| 325 for line in template: | |
| 326 | |
| 3028 | 327 for part, extend_list in parts.items(): |
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328 if line.lstrip().startswith("##{}_PART##".format(part)): |
| 2085 | 329 bridge.extend(extend_list) |
| 330 break | |
| 331 else: | |
| 332 # the line is not a magic part replacement | |
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333 if line.lstrip().startswith("const_"): |
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334 const_name = line[len("const_") : line.find(" = ")].strip() |
| 2085 | 335 if const_name in const_override: |
| 3028 | 336 print(("const {} overriden".format(const_name))) |
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337 bridge.append( |
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338 "const_{} = {}".format( |
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339 const_name, const_override[const_name] |
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340 ) |
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341 ) |
| 2085 | 342 continue |
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343 bridge.append(line.replace("\n", "")) |
| 2085 | 344 except IOError: |
| 3028 | 345 print(("can't open template file [{}]".format(template_path))) |
| 2085 | 346 sys.exit(1) |
| 347 | |
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348 # now we write to final file |
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349 self.final_write(DEST, bridge) |
| 2085 | 350 |
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351 def final_write(self, filename, file_buf): |
| 2085 | 352 """Write the final generated file in [dest dir]/filename |
| 353 | |
| 354 @param filename: name of the file to generate | |
| 355 @param file_buf: list of lines (stings) of the file | |
| 356 """ | |
| 357 if os.path.exists(self.args.dest_dir) and not os.path.isdir(self.args.dest_dir): | |
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358 print( |
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359 "The destination dir [%s] can't be created: a file with this name already exists !" |
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360 ) |
| 2085 | 361 sys.exit(1) |
| 362 try: | |
| 363 if not os.path.exists(self.args.dest_dir): | |
| 364 os.mkdir(self.args.dest_dir) | |
| 365 full_path = os.path.join(self.args.dest_dir, filename) | |
| 366 if os.path.exists(full_path) and not self.args.force: | |
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367 print( |
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368 ( |
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369 "The destination file [%s] already exists ! Use --force to overwrite it" |
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370 % full_path |
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371 ) |
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372 ) |
| 2085 | 373 try: |
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374 with open(full_path, "w") as dest_file: |
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375 dest_file.write("\n".join(file_buf)) |
| 2085 | 376 except IOError: |
| 3028 | 377 print(("Can't open destination file [%s]" % full_path)) |
| 2085 | 378 except OSError: |
| 379 print("It's not possible to generate the file, check your permissions") | |
| 380 exit(1) |