| File: | root/firefox-clang/obj-x86_64-pc-linux-gnu/layout/mathml/./../../../layout/mathml/nsMathMLOperators.cpp |
| Warning: | line 191, column 13 Value stored to 'end' during its initialization is never read |
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| 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| 4 | |
| 5 | #include "nsMathMLOperators.h" |
| 6 | |
| 7 | #include "mozilla/StaticPrefs_mathml.h" |
| 8 | #include "mozilla/Utf16.h" |
| 9 | #include "mozilla/intl/UnicodeProperties.h" |
| 10 | #include "nsCOMPtr.h" |
| 11 | #include "nsCRT.h" |
| 12 | #include "nsHashKeys.h" |
| 13 | #include "nsIPersistentProperties2.h" |
| 14 | #include "nsISimpleEnumerator.h" |
| 15 | #include "nsNetUtil.h" |
| 16 | #include "nsTArray.h" |
| 17 | #include "nsTHashMap.h" |
| 18 | |
| 19 | using namespace mozilla; |
| 20 | |
| 21 | // operator dictionary entry |
| 22 | struct OperatorData { |
| 23 | OperatorData(void) : mLeadingSpace(0.0f), mTrailingSpace(0.0f) {} |
| 24 | |
| 25 | // member data |
| 26 | nsString mStr; |
| 27 | nsOperatorFlags mFlags; |
| 28 | float mLeadingSpace; // unit is em |
| 29 | float mTrailingSpace; // unit is em |
| 30 | }; |
| 31 | |
| 32 | static int32_t gTableRefCount = 0; |
| 33 | static uint32_t gOperatorCount = 0; |
| 34 | static OperatorData* gOperatorArray = nullptr; |
| 35 | static nsTHashMap<nsStringHashKey, OperatorData*>* gOperatorTable = nullptr; |
| 36 | static bool gGlobalsInitialized = false; |
| 37 | |
| 38 | static const char16_t kDashCh = char16_t('#'); |
| 39 | static const char16_t kColonCh = char16_t(':'); |
| 40 | |
| 41 | static uint32_t ToUnicodeCodePoint(const nsString& aOperator) { |
| 42 | if (aOperator.Length() == 1) { |
| 43 | return aOperator[0]; |
| 44 | } |
| 45 | if (aOperator.Length() == 2 && |
| 46 | mozilla::IsSurrogatePair(aOperator[0], aOperator[1])) { |
| 47 | return mozilla::SurrogateToUCS4(aOperator[0], aOperator[1]); |
| 48 | } |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | static void SetBooleanProperty(OperatorData* aOperatorData, nsString aName) { |
| 53 | if (aName.IsEmpty()) { |
| 54 | return; |
| 55 | } |
| 56 | |
| 57 | if (aName.EqualsLiteral("stretchy") && (1 == aOperatorData->mStr.Length())) { |
| 58 | aOperatorData->mFlags.Booleans() += OperatorBoolean::Stretchy; |
| 59 | } else if (aName.EqualsLiteral("fence")) { |
| 60 | aOperatorData->mFlags.Booleans() += OperatorBoolean::Fence; |
| 61 | } else if (!StaticPrefs::mathml_operator_dictionary_accent_disabled() && |
| 62 | aName.EqualsLiteral("accent")) { |
| 63 | aOperatorData->mFlags.Booleans() += OperatorBoolean::Accent; |
| 64 | } else if (aName.EqualsLiteral("largeop")) { |
| 65 | aOperatorData->mFlags.Booleans() += OperatorBoolean::LargeOperator; |
| 66 | } else if (aName.EqualsLiteral("separator")) { |
| 67 | aOperatorData->mFlags.Booleans() += OperatorBoolean::Separator; |
| 68 | } else if (aName.EqualsLiteral("movablelimits")) { |
| 69 | aOperatorData->mFlags.Booleans() += OperatorBoolean::MovableLimits; |
| 70 | } else if (aName.EqualsLiteral("symmetric")) { |
| 71 | aOperatorData->mFlags.Booleans() += OperatorBoolean::Symmetric; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | static void SetProperty(OperatorData* aOperatorData, nsString aName, |
| 76 | nsString aValue) { |
| 77 | if (aName.IsEmpty() || aValue.IsEmpty()) { |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | if (aName.EqualsLiteral("direction")) { |
| 82 | if (aValue.EqualsLiteral("vertical")) { |
| 83 | aOperatorData->mFlags.SetDirection(OperatorDirection::Vertical); |
| 84 | } else if (aValue.EqualsLiteral("horizontal")) { |
| 85 | aOperatorData->mFlags.SetDirection(OperatorDirection::Horizontal); |
| 86 | } else { |
| 87 | return; // invalid value |
| 88 | } |
| 89 | } else { |
| 90 | bool isLeadingSpace; |
| 91 | if (aName.EqualsLiteral("lspace")) { |
| 92 | isLeadingSpace = true; |
| 93 | } else if (aName.EqualsLiteral("rspace")) { |
| 94 | isLeadingSpace = false; |
| 95 | } else { |
| 96 | return; // input is not applicable |
| 97 | } |
| 98 | |
| 99 | // aValue is assumed to be a digit from 0 to 7 |
| 100 | nsresult error = NS_OK; |
| 101 | float space = aValue.ToFloat(&error) / 18.0; |
| 102 | if (NS_FAILED(error)((bool)(__builtin_expect(!!(NS_FAILED_impl(error)), 0)))) { |
| 103 | return; |
| 104 | } |
| 105 | |
| 106 | if (isLeadingSpace) { |
| 107 | aOperatorData->mLeadingSpace = space; |
| 108 | } else { |
| 109 | aOperatorData->mTrailingSpace = space; |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static bool SetOperator(OperatorData* aOperatorData, OperatorForm aForm, |
| 115 | const nsCString& aOperator, nsString& aAttributes) |
| 116 | |
| 117 | { |
| 118 | static const char16_t kNullCh = char16_t('\0'); |
| 119 | |
| 120 | // aOperator is in the expanded format \uNNNN\uNNNN ... |
| 121 | // First compress these Unicode points to the internal nsString format |
| 122 | int32_t i = 0; |
| 123 | nsAutoString name, value; |
| 124 | int32_t len = aOperator.Length(); |
| 125 | char16_t c = aOperator[i++]; |
| 126 | uint32_t state = 0; |
| 127 | char16_t uchar = 0; |
| 128 | while (i <= len) { |
| 129 | if (0 == state) { |
| 130 | if (c != '\\') { |
| 131 | return false; |
| 132 | } |
| 133 | if (i < len) { |
| 134 | c = aOperator[i]; |
| 135 | } |
| 136 | i++; |
| 137 | if (('u' != c) && ('U' != c)) { |
| 138 | return false; |
| 139 | } |
| 140 | if (i < len) { |
| 141 | c = aOperator[i]; |
| 142 | } |
| 143 | i++; |
| 144 | state++; |
| 145 | } else { |
| 146 | if (('0' <= c) && (c <= '9')) { |
| 147 | uchar = (uchar << 4) | (c - '0'); |
| 148 | } else if (('a' <= c) && (c <= 'f')) { |
| 149 | uchar = (uchar << 4) | (c - 'a' + 0x0a); |
| 150 | } else if (('A' <= c) && (c <= 'F')) { |
| 151 | uchar = (uchar << 4) | (c - 'A' + 0x0a); |
| 152 | } else { |
| 153 | return false; |
| 154 | } |
| 155 | if (i < len) { |
| 156 | c = aOperator[i]; |
| 157 | } |
| 158 | i++; |
| 159 | state++; |
| 160 | if (5 == state) { |
| 161 | value.Append(uchar); |
| 162 | uchar = 0; |
| 163 | state = 0; |
| 164 | } |
| 165 | } |
| 166 | } |
| 167 | if (0 != state) { |
| 168 | return false; |
| 169 | } |
| 170 | |
| 171 | // Quick return when the caller doesn't care about the attributes and just |
| 172 | // wants to know if this is a valid operator (this is the case at the first |
| 173 | // pass of the parsing of the dictionary in InitOperators()) |
| 174 | if (aForm == OperatorForm::Unknown) { |
| 175 | return true; |
| 176 | } |
| 177 | |
| 178 | // Add operator to hash table |
| 179 | aOperatorData->mFlags.SetForm(aForm); |
| 180 | aOperatorData->mStr.Assign(value); |
| 181 | value.AppendInt(static_cast<uint32_t>(aForm), 10); |
| 182 | gOperatorTable->InsertOrUpdate(value, aOperatorData); |
| 183 | |
| 184 | #ifdef DEBUG1 |
| 185 | NS_LossyConvertUTF16toASCII str(aAttributes); |
| 186 | #endif |
| 187 | // Loop over the space-delimited list of attributes to get the name:value |
| 188 | // pairs |
| 189 | aAttributes.Append(kNullCh); // put an extra null at the end |
| 190 | char16_t* start = aAttributes.BeginWriting(); |
| 191 | char16_t* end = start; |
Value stored to 'end' during its initialization is never read | |
| 192 | while ((kNullCh != *start) && (kDashCh != *start)) { |
| 193 | name.SetLength(0); |
| 194 | value.SetLength(0); |
| 195 | // skip leading space, the dash amounts to the end of the line |
| 196 | while ((kNullCh != *start) && (kDashCh != *start) && |
| 197 | nsCRT::IsAsciiSpace(*start)) { |
| 198 | ++start; |
| 199 | } |
| 200 | end = start; |
| 201 | // look for ':' |
| 202 | while ((kNullCh != *end) && (kDashCh != *end) && |
| 203 | !nsCRT::IsAsciiSpace(*end) && (kColonCh != *end)) { |
| 204 | ++end; |
| 205 | } |
| 206 | // If ':' is not found, then it's a boolean property |
| 207 | bool IsBooleanProperty = (kColonCh != *end); |
| 208 | *end = kNullCh; // end segment here |
| 209 | // this segment is the name |
| 210 | if (start < end) { |
| 211 | name.Assign(start); |
| 212 | } |
| 213 | if (IsBooleanProperty) { |
| 214 | SetBooleanProperty(aOperatorData, name); |
| 215 | } else { |
| 216 | start = ++end; |
| 217 | // look for space or end of line |
| 218 | while ((kNullCh != *end) && (kDashCh != *end) && |
| 219 | !nsCRT::IsAsciiSpace(*end)) { |
| 220 | ++end; |
| 221 | } |
| 222 | *end = kNullCh; // end segment here |
| 223 | if (start < end) { |
| 224 | // this segment is the value |
| 225 | value.Assign(start); |
| 226 | } |
| 227 | SetProperty(aOperatorData, name, value); |
| 228 | } |
| 229 | start = ++end; |
| 230 | } |
| 231 | return true; |
| 232 | } |
| 233 | |
| 234 | static nsresult InitOperators(void) { |
| 235 | // Load the property file containing the Operator Dictionary |
| 236 | nsresult rv; |
| 237 | nsCOMPtr<nsIPersistentProperties> mathfontProp; |
| 238 | rv = NS_LoadPersistentPropertiesFromURISpec( |
| 239 | getter_AddRefs(mathfontProp), |
| 240 | "resource://gre/res/fonts/mathfont.properties"_ns); |
| 241 | |
| 242 | if (NS_FAILED(rv)((bool)(__builtin_expect(!!(NS_FAILED_impl(rv)), 0)))) { |
| 243 | return rv; |
| 244 | } |
| 245 | |
| 246 | // Parse the Operator Dictionary in two passes. |
| 247 | // The first pass is to count the number of operators; the second pass is to |
| 248 | // allocate the necessary space for them and to add them in the hash table. |
| 249 | for (int32_t pass = 1; pass <= 2; pass++) { |
| 250 | OperatorData dummyData; |
| 251 | OperatorData* operatorData = &dummyData; |
| 252 | nsCOMPtr<nsISimpleEnumerator> iterator; |
| 253 | if (NS_SUCCEEDED(mathfontProp->Enumerate(getter_AddRefs(iterator)))((bool)(__builtin_expect(!!(!NS_FAILED_impl(mathfontProp-> Enumerate(getter_AddRefs(iterator)))), 1)))) { |
| 254 | bool more; |
| 255 | uint32_t index = 0; |
| 256 | nsAutoCString name; |
| 257 | nsAutoString attributes; |
| 258 | while ((NS_SUCCEEDED(iterator->HasMoreElements(&more))((bool)(__builtin_expect(!!(!NS_FAILED_impl(iterator->HasMoreElements (&more))), 1)))) && more) { |
| 259 | nsCOMPtr<nsISupports> supports; |
| 260 | nsCOMPtr<nsIPropertyElement> element; |
| 261 | if (NS_SUCCEEDED(iterator->GetNext(getter_AddRefs(supports)))((bool)(__builtin_expect(!!(!NS_FAILED_impl(iterator->GetNext (getter_AddRefs(supports)))), 1)))) { |
| 262 | element = do_QueryInterface(supports); |
| 263 | if (NS_SUCCEEDED(element->GetKey(name))((bool)(__builtin_expect(!!(!NS_FAILED_impl(element->GetKey (name))), 1))) && |
| 264 | NS_SUCCEEDED(element->GetValue(attributes))((bool)(__builtin_expect(!!(!NS_FAILED_impl(element->GetValue (attributes))), 1)))) { |
| 265 | // expected key: operator.\uNNNN.{infix,postfix,prefix} |
| 266 | if ((21 <= name.Length()) && (0 == name.Find("operator.\\u"))) { |
| 267 | name.Cut(0, 9); // 9 is the length of "operator."; |
| 268 | int32_t len = name.Length(); |
| 269 | OperatorForm form; |
| 270 | if (kNotFound != name.RFind(".infix")) { |
| 271 | form = OperatorForm::Infix; |
| 272 | len -= 6; // 6 is the length of ".infix"; |
| 273 | } else if (kNotFound != name.RFind(".postfix")) { |
| 274 | form = OperatorForm::Postfix; |
| 275 | len -= 8; // 8 is the length of ".postfix"; |
| 276 | } else if (kNotFound != name.RFind(".prefix")) { |
| 277 | form = OperatorForm::Prefix; |
| 278 | len -= 7; // 7 is the length of ".prefix"; |
| 279 | } else { |
| 280 | continue; // input is not applicable |
| 281 | } |
| 282 | name.SetLength(len); |
| 283 | if (2 == pass) { // allocate space and start the storage |
| 284 | if (!gOperatorArray) { |
| 285 | if (0 == gOperatorCount) { |
| 286 | return NS_ERROR_UNEXPECTED; |
| 287 | } |
| 288 | gOperatorArray = new OperatorData[gOperatorCount]; |
| 289 | } |
| 290 | operatorData = &gOperatorArray[index]; |
| 291 | } else { |
| 292 | form = OperatorForm::Unknown; // to quickly return from |
| 293 | // SetOperator() at pass 1 |
| 294 | } |
| 295 | // See if the operator should be retained |
| 296 | if (SetOperator(operatorData, form, name, attributes)) { |
| 297 | index++; |
| 298 | if (1 == pass) { |
| 299 | gOperatorCount = index; |
| 300 | } |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | } |
| 307 | } |
| 308 | return NS_OK; |
| 309 | } |
| 310 | |
| 311 | static nsresult InitOperatorGlobals() { |
| 312 | gGlobalsInitialized = true; |
| 313 | nsresult rv = NS_ERROR_OUT_OF_MEMORY; |
| 314 | gOperatorTable = new nsTHashMap<nsStringHashKey, OperatorData*>(); |
| 315 | if (gOperatorTable) { |
| 316 | rv = InitOperators(); |
| 317 | } |
| 318 | if (NS_FAILED(rv)((bool)(__builtin_expect(!!(NS_FAILED_impl(rv)), 0)))) { |
| 319 | nsMathMLOperators::CleanUp(); |
| 320 | } |
| 321 | return rv; |
| 322 | } |
| 323 | |
| 324 | void nsMathMLOperators::CleanUp() { |
| 325 | if (gOperatorArray) { |
| 326 | delete[] gOperatorArray; |
| 327 | gOperatorArray = nullptr; |
| 328 | } |
| 329 | if (gOperatorTable) { |
| 330 | delete gOperatorTable; |
| 331 | gOperatorTable = nullptr; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | void nsMathMLOperators::AddRefTable(void) { gTableRefCount++; } |
| 336 | |
| 337 | void nsMathMLOperators::ReleaseTable(void) { |
| 338 | if (0 == --gTableRefCount) { |
| 339 | CleanUp(); |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | static OperatorData* GetOperatorData(const nsString& aOperator, |
| 344 | const OperatorForm aForm) { |
| 345 | nsAutoString key(aOperator); |
| 346 | key.AppendInt(static_cast<uint32_t>(aForm)); |
| 347 | return gOperatorTable->Get(key); |
| 348 | } |
| 349 | |
| 350 | bool nsMathMLOperators::LookupOperator(const nsString& aOperator, |
| 351 | OperatorForm aForm, |
| 352 | nsOperatorFlags* aFlags, |
| 353 | float* aLeadingSpace, |
| 354 | float* aTrailingSpace) { |
| 355 | NS_ASSERTION(aFlags && aLeadingSpace && aTrailingSpace, "bad usage")do { if (!(aFlags && aLeadingSpace && aTrailingSpace )) { NS_DebugBreak(NS_DEBUG_ASSERTION, "bad usage", "aFlags && aLeadingSpace && aTrailingSpace" , "./../../../layout/mathml/nsMathMLOperators.cpp", 355); MOZ_PretendNoReturn (); } } while (0); |
| 356 | NS_ASSERTION(aForm != OperatorForm::Unknown, "*** invalid call ***")do { if (!(aForm != OperatorForm::Unknown)) { NS_DebugBreak(NS_DEBUG_ASSERTION , "*** invalid call ***", "aForm != OperatorForm::Unknown", "./../../../layout/mathml/nsMathMLOperators.cpp" , 356); MOZ_PretendNoReturn(); } } while (0); |
| 357 | |
| 358 | // Operator strings must be of length 1 or 2 in UTF-16. |
| 359 | // https://w3c.github.io/mathml-core/#dfn-algorithm-to-determine-the-category-of-an-operator |
| 360 | if (aOperator.IsEmpty() || aOperator.Length() > 2) { |
| 361 | return false; |
| 362 | } |
| 363 | |
| 364 | if (aOperator.Length() == 2) { |
| 365 | // Try and handle Arabic operators. |
| 366 | // https://w3c.github.io/mathml-core/#dfn-algorithm-to-determine-the-category-of-an-operator |
| 367 | if (auto codePoint = ToUnicodeCodePoint(aOperator)) { |
| 368 | if (aForm == OperatorForm::Postfix && |
| 369 | (codePoint == 0x1EEF0 || codePoint == 0x1EEF1)) { |
| 370 | // Use category I. |
| 371 | // https://w3c.github.io/mathml-core/#operator-dictionary-categories-values |
| 372 | aFlags->SetForm(OperatorForm::Postfix); |
| 373 | aFlags->Booleans() = OperatorBoolean::Stretchy; |
| 374 | aFlags->SetDirection(OperatorDirection::Horizontal); |
| 375 | *aLeadingSpace = 0; |
| 376 | *aTrailingSpace = 0; |
| 377 | return true; |
| 378 | } |
| 379 | return false; |
| 380 | } |
| 381 | |
| 382 | // Ignore the combining "negation" suffix for 2-character strings. |
| 383 | // https://w3c.github.io/mathml-core/#dfn-algorithm-to-determine-the-category-of-an-operator |
| 384 | if (aOperator[1] == 0x0338 || aOperator[1] == 0x20D2) { |
| 385 | nsAutoString newOperator; |
| 386 | newOperator.Append(aOperator[0]); |
| 387 | return LookupOperator(newOperator, aForm, aFlags, aLeadingSpace, |
| 388 | aTrailingSpace); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | if (!gGlobalsInitialized) { |
| 393 | InitOperatorGlobals(); |
| 394 | } |
| 395 | if (gOperatorTable) { |
| 396 | if (OperatorData* data = GetOperatorData(aOperator, aForm)) { |
| 397 | NS_ASSERTION(data->mStr.Equals(aOperator), "bad setup")do { if (!(data->mStr.Equals(aOperator))) { NS_DebugBreak( NS_DEBUG_ASSERTION, "bad setup", "data->mStr.Equals(aOperator)" , "./../../../layout/mathml/nsMathMLOperators.cpp", 397); MOZ_PretendNoReturn (); } } while (0); |
| 398 | *aFlags = data->mFlags; |
| 399 | *aLeadingSpace = data->mLeadingSpace; |
| 400 | *aTrailingSpace = data->mTrailingSpace; |
| 401 | return true; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | return false; |
| 406 | } |
| 407 | |
| 408 | bool nsMathMLOperators::LookupOperatorWithFallback(const nsString& aOperator, |
| 409 | OperatorForm aForm, |
| 410 | nsOperatorFlags* aFlags, |
| 411 | float* aLeadingSpace, |
| 412 | float* aTrailingSpace) { |
| 413 | if (LookupOperator(aOperator, aForm, aFlags, aLeadingSpace, aTrailingSpace)) { |
| 414 | return true; |
| 415 | } |
| 416 | for (const auto& form : |
| 417 | {OperatorForm::Infix, OperatorForm::Postfix, OperatorForm::Prefix}) { |
| 418 | if (form == aForm) { |
| 419 | // This form was tried above, skip it. |
| 420 | continue; |
| 421 | } |
| 422 | if (LookupOperator(aOperator, form, aFlags, aLeadingSpace, |
| 423 | aTrailingSpace)) { |
| 424 | return true; |
| 425 | } |
| 426 | } |
| 427 | return false; |
| 428 | } |
| 429 | |
| 430 | /* static */ |
| 431 | bool nsMathMLOperators::IsMirrorableOperator(const nsString& aOperator) { |
| 432 | if (auto codePoint = ToUnicodeCodePoint(aOperator)) { |
| 433 | return intl::UnicodeProperties::IsMirrored(codePoint); |
| 434 | } |
| 435 | return false; |
| 436 | } |
| 437 | |
| 438 | /* static */ |
| 439 | nsString nsMathMLOperators::GetMirroredOperator(const nsString& aOperator) { |
| 440 | nsString result; |
| 441 | if (auto codePoint = ToUnicodeCodePoint(aOperator)) { |
| 442 | result.Assign(intl::UnicodeProperties::CharMirror(codePoint)); |
| 443 | } |
| 444 | return result; |
| 445 | } |
| 446 | |
| 447 | /* static */ |
| 448 | bool nsMathMLOperators::IsIntegralOperator(const nsString& aOperator) { |
| 449 | if (auto codePoint = ToUnicodeCodePoint(aOperator)) { |
| 450 | return (0x222B <= codePoint && codePoint <= 0x2233) || |
| 451 | (0x2A0B <= codePoint && codePoint <= 0x2A1C); |
| 452 | } |
| 453 | return false; |
| 454 | } |
| 455 | |
| 456 | /* static */ |
| 457 | StretchDirection nsMathMLOperators::GetStretchyDirection( |
| 458 | const nsString& aOperator) { |
| 459 | // Search any entry for that operator and return the corresponding direction. |
| 460 | // It is assumed that all the forms have same direction. |
| 461 | for (const auto& form : |
| 462 | {OperatorForm::Infix, OperatorForm::Postfix, OperatorForm::Prefix}) { |
| 463 | nsOperatorFlags flags; |
| 464 | float dummy; |
| 465 | if (nsMathMLOperators::LookupOperator(aOperator, form, &flags, &dummy, |
| 466 | &dummy)) { |
| 467 | if (flags.Direction() == OperatorDirection::Vertical) { |
| 468 | return StretchDirection::Vertical; |
| 469 | } |
| 470 | if (flags.Direction() == OperatorDirection::Horizontal) { |
| 471 | return StretchDirection::Horizontal; |
| 472 | } |
| 473 | } |
| 474 | } |
| 475 | return StretchDirection::Unsupported; |
| 476 | } |