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comparison: content/base/src/nsAttrValue.h

content/base/src/nsAttrValue.h

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 /*
7 * A struct that represents the value (type and actual data) of an
8 * attribute.
9 */
10
11 #ifndef nsAttrValue_h___
12 #define nsAttrValue_h___
13
14 #include "nscore.h"
15 #include "nsStringGlue.h"
16 #include "nsStringBuffer.h"
17 #include "nsColor.h"
18 #include "nsCaseTreatment.h"
19 #include "nsMargin.h"
20 #include "nsCOMPtr.h"
21 #include "SVGAttrValueWrapper.h"
22 #include "nsTArrayForwardDeclare.h"
23 #include "nsIAtom.h"
24 #include "mozilla/MemoryReporting.h"
25 #include "mozilla/dom/BindingDeclarations.h"
26
27 class nsAString;
28 class nsIDocument;
29 class nsStyledElementNotElementCSSInlineStyle;
30 struct MiscContainer;
31
32 namespace mozilla {
33 namespace css {
34 class StyleRule;
35 struct URLValue;
36 struct ImageValue;
37 }
38 }
39
40 #define NS_ATTRVALUE_MAX_STRINGLENGTH_ATOM 12
41
42 #define NS_ATTRVALUE_BASETYPE_MASK (uintptr_t(3))
43 #define NS_ATTRVALUE_POINTERVALUE_MASK (~NS_ATTRVALUE_BASETYPE_MASK)
44
45 #define NS_ATTRVALUE_INTEGERTYPE_BITS 4
46 #define NS_ATTRVALUE_INTEGERTYPE_MASK (uintptr_t((1 << NS_ATTRVALUE_INTEGERTYPE_BITS) - 1))
47 #define NS_ATTRVALUE_INTEGERTYPE_MULTIPLIER (1 << NS_ATTRVALUE_INTEGERTYPE_BITS)
48 #define NS_ATTRVALUE_INTEGERTYPE_MAXVALUE ((1 << (31 - NS_ATTRVALUE_INTEGERTYPE_BITS)) - 1)
49 #define NS_ATTRVALUE_INTEGERTYPE_MINVALUE (-NS_ATTRVALUE_INTEGERTYPE_MAXVALUE - 1)
50
51 #define NS_ATTRVALUE_ENUMTABLEINDEX_BITS (32 - 16 - NS_ATTRVALUE_INTEGERTYPE_BITS)
52 #define NS_ATTRVALUE_ENUMTABLE_VALUE_NEEDS_TO_UPPER (1 << (NS_ATTRVALUE_ENUMTABLEINDEX_BITS - 1))
53 #define NS_ATTRVALUE_ENUMTABLEINDEX_MAXVALUE (NS_ATTRVALUE_ENUMTABLE_VALUE_NEEDS_TO_UPPER - 1)
54 #define NS_ATTRVALUE_ENUMTABLEINDEX_MASK \
55 (uintptr_t((((1 << NS_ATTRVALUE_ENUMTABLEINDEX_BITS) - 1) &~ NS_ATTRVALUE_ENUMTABLE_VALUE_NEEDS_TO_UPPER)))
56
57 /**
58 * A class used to construct a nsString from a nsStringBuffer (we might
59 * want to move this to nsString at some point).
60 *
61 * WARNING: Note that nsCheapString doesn't take an explicit length -- it
62 * assumes the string is maximally large, given the nsStringBuffer's storage
63 * size. This means the given string buffer *must* be sized exactly correctly
64 * for the string it contains (including one byte for a null terminator). If
65 * it has any unused storage space, then that will result in bogus characters
66 * at the end of our nsCheapString.
67 */
68 class nsCheapString : public nsString {
69 public:
70 nsCheapString(nsStringBuffer* aBuf)
71 {
72 if (aBuf)
73 aBuf->ToString(aBuf->StorageSize()/sizeof(char16_t) - 1, *this);
74 }
75 };
76
77 class nsAttrValue {
78 friend struct MiscContainer;
79 public:
80 typedef nsTArray< nsCOMPtr<nsIAtom> > AtomArray;
81
82 // This has to be the same as in ValueBaseType
83 enum ValueType {
84 eString = 0x00, // 00
85 // 01 this value indicates an 'misc' struct
86 eAtom = 0x02, // 10
87 eInteger = 0x03, // 0011
88 eColor = 0x07, // 0111
89 eEnum = 0x0B, // 1011 This should eventually die
90 ePercent = 0x0F, // 1111
91 // Values below here won't matter, they'll be always stored in the 'misc'
92 // struct.
93 eCSSStyleRule = 0x10
94 ,eURL = 0x11
95 ,eImage = 0x12
96 ,eAtomArray = 0x13
97 ,eDoubleValue = 0x14
98 ,eIntMarginValue = 0x15
99 ,eSVGAngle = 0x16
100 ,eSVGTypesBegin = eSVGAngle
101 ,eSVGIntegerPair = 0x17
102 ,eSVGLength = 0x18
103 ,eSVGLengthList = 0x19
104 ,eSVGNumberList = 0x1A
105 ,eSVGNumberPair = 0x1B
106 ,eSVGPathData = 0x1C
107 ,eSVGPointList = 0x1D
108 ,eSVGPreserveAspectRatio = 0x1E
109 ,eSVGStringList = 0x1F
110 ,eSVGTransformList = 0x20
111 ,eSVGViewBox = 0x21
112 ,eSVGTypesEnd = eSVGViewBox
113 };
114
115 nsAttrValue();
116 nsAttrValue(const nsAttrValue& aOther);
117 explicit nsAttrValue(const nsAString& aValue);
118 explicit nsAttrValue(nsIAtom* aValue);
119 nsAttrValue(mozilla::css::StyleRule* aValue, const nsAString* aSerialized);
120 explicit nsAttrValue(const nsIntMargin& aValue);
121 ~nsAttrValue();
122
123 inline const nsAttrValue& operator=(const nsAttrValue& aOther);
124
125 static nsresult Init();
126 static void Shutdown();
127
128 ValueType Type() const;
129
130 void Reset();
131
132 void SetTo(const nsAttrValue& aOther);
133 void SetTo(const nsAString& aValue);
134 void SetTo(nsIAtom* aValue);
135 void SetTo(int16_t aInt);
136 void SetTo(int32_t aInt, const nsAString* aSerialized);
137 void SetTo(double aValue, const nsAString* aSerialized);
138 void SetTo(mozilla::css::StyleRule* aValue, const nsAString* aSerialized);
139 void SetTo(mozilla::css::URLValue* aValue, const nsAString* aSerialized);
140 void SetTo(const nsIntMargin& aValue);
141 void SetTo(const nsSVGAngle& aValue, const nsAString* aSerialized);
142 void SetTo(const nsSVGIntegerPair& aValue, const nsAString* aSerialized);
143 void SetTo(const nsSVGLength2& aValue, const nsAString* aSerialized);
144 void SetTo(const mozilla::SVGLengthList& aValue,
145 const nsAString* aSerialized);
146 void SetTo(const mozilla::SVGNumberList& aValue,
147 const nsAString* aSerialized);
148 void SetTo(const nsSVGNumberPair& aValue, const nsAString* aSerialized);
149 void SetTo(const mozilla::SVGPathData& aValue, const nsAString* aSerialized);
150 void SetTo(const mozilla::SVGPointList& aValue, const nsAString* aSerialized);
151 void SetTo(const mozilla::SVGAnimatedPreserveAspectRatio& aValue,
152 const nsAString* aSerialized);
153 void SetTo(const mozilla::SVGStringList& aValue,
154 const nsAString* aSerialized);
155 void SetTo(const mozilla::SVGTransformList& aValue,
156 const nsAString* aSerialized);
157 void SetTo(const nsSVGViewBox& aValue, const nsAString* aSerialized);
158
159 /**
160 * Sets this object with the string or atom representation of aValue.
161 *
162 * After calling this method, this object will have type eString unless the
163 * type of aValue is eAtom, in which case this object will also have type
164 * eAtom.
165 */
166 void SetToSerialized(const nsAttrValue& aValue);
167
168 void SwapValueWith(nsAttrValue& aOther);
169
170 void ToString(nsAString& aResult) const;
171 inline void ToString(mozilla::dom::DOMString& aResult) const;
172
173 /**
174 * Returns the value of this object as an atom. If necessary, the value will
175 * first be serialised using ToString before converting to an atom.
176 */
177 already_AddRefed<nsIAtom> GetAsAtom() const;
178
179 // Methods to get value. These methods do not convert so only use them
180 // to retrieve the datatype that this nsAttrValue has.
181 inline bool IsEmptyString() const;
182 const nsCheapString GetStringValue() const;
183 inline nsIAtom* GetAtomValue() const;
184 inline int32_t GetIntegerValue() const;
185 bool GetColorValue(nscolor& aColor) const;
186 inline int16_t GetEnumValue() const;
187 inline float GetPercentValue() const;
188 inline AtomArray* GetAtomArrayValue() const;
189 inline mozilla::css::StyleRule* GetCSSStyleRuleValue() const;
190 inline mozilla::css::URLValue* GetURLValue() const;
191 inline mozilla::css::ImageValue* GetImageValue() const;
192 inline double GetDoubleValue() const;
193 bool GetIntMarginValue(nsIntMargin& aMargin) const;
194
195 /**
196 * Returns the string corresponding to the stored enum value.
197 *
198 * @param aResult the string representing the enum tag
199 * @param aRealTag wheter we want to have the real tag or the saved one
200 */
201 void GetEnumString(nsAString& aResult, bool aRealTag) const;
202
203 // Methods to get access to atoms we may have
204 // Returns the number of atoms we have; 0 if we have none. It's OK
205 // to call this without checking the type first; it handles that.
206 uint32_t GetAtomCount() const;
207 // Returns the atom at aIndex (0-based). Do not call this with
208 // aIndex >= GetAtomCount().
209 nsIAtom* AtomAt(int32_t aIndex) const;
210
211 uint32_t HashValue() const;
212 bool Equals(const nsAttrValue& aOther) const;
213 // aCaseSensitive == eIgnoreCase means ASCII case-insenstive matching
214 bool Equals(const nsAString& aValue, nsCaseTreatment aCaseSensitive) const;
215 bool Equals(nsIAtom* aValue, nsCaseTreatment aCaseSensitive) const;
216
217 /**
218 * Compares this object with aOther according to their string representation.
219 *
220 * For example, when called on an object with type eInteger and value 4, and
221 * given aOther of type eString and value "4", EqualsAsStrings will return
222 * true (while Equals will return false).
223 */
224 bool EqualsAsStrings(const nsAttrValue& aOther) const;
225
226 /**
227 * Returns true if this AttrValue is equal to the given atom, or is an
228 * array which contains the given atom.
229 */
230 bool Contains(nsIAtom* aValue, nsCaseTreatment aCaseSensitive) const;
231 /**
232 * Returns true if this AttrValue is an atom equal to the given
233 * string, or is an array of atoms which contains the given string.
234 * This always does a case-sensitive comparison.
235 */
236 bool Contains(const nsAString& aValue) const;
237
238 void ParseAtom(const nsAString& aValue);
239 void ParseAtomArray(const nsAString& aValue);
240 void ParseStringOrAtom(const nsAString& aValue);
241
242 /**
243 * Structure for a mapping from int (enum) values to strings. When you use
244 * it you generally create an array of them.
245 * Instantiate like this:
246 * EnumTable myTable[] = {
247 * { "string1", 1 },
248 * { "string2", 2 },
249 * { 0 }
250 * }
251 */
252 struct EnumTable {
253 /** The string the value maps to */
254 const char* tag;
255 /** The enum value that maps to this string */
256 int16_t value;
257 };
258
259 /**
260 * Parse into an enum value.
261 *
262 * @param aValue the string to find the value for
263 * @param aTable the enumeration to map with
264 * @param aCaseSensitive specify if the parsing has to be case sensitive
265 * @param aDefaultValue if non-null, this function will always return true.
266 * Failure to parse aValue as one of the values in aTable will just
267 * cause aDefaultValue->value to be stored as the enumeration value.
268 * @return whether the enum value was found or not
269 */
270 bool ParseEnumValue(const nsAString& aValue,
271 const EnumTable* aTable,
272 bool aCaseSensitive,
273 const EnumTable* aDefaultValue = nullptr);
274
275 /**
276 * Parse a string into an integer. Can optionally parse percent (n%).
277 * This method explicitly sets a lower bound of zero on the element,
278 * whether it be percent or raw integer.
279 *
280 * @param aString the string to parse
281 * @return whether the value could be parsed
282 *
283 * @see http://www.whatwg.org/html/#rules-for-parsing-dimension-values
284 */
285 bool ParseSpecialIntValue(const nsAString& aString);
286
287
288 /**
289 * Parse a string value into an integer.
290 *
291 * @param aString the string to parse
292 * @return whether the value could be parsed
293 */
294 bool ParseIntValue(const nsAString& aString) {
295 return ParseIntWithBounds(aString, INT32_MIN, INT32_MAX);
296 }
297
298 /**
299 * Parse a string value into an integer with minimum value and maximum value.
300 *
301 * @param aString the string to parse
302 * @param aMin the minimum value (if value is less it will be bumped up)
303 * @param aMax the maximum value (if value is greater it will be chopped down)
304 * @return whether the value could be parsed
305 */
306 bool ParseIntWithBounds(const nsAString& aString, int32_t aMin,
307 int32_t aMax = INT32_MAX);
308
309 /**
310 * Parse a string value into a non-negative integer.
311 * This method follows the rules for parsing non-negative integer from:
312 * http://dev.w3.org/html5/spec/infrastructure.html#rules-for-parsing-non-negative-integers
313 *
314 * @param aString the string to parse
315 * @return whether the value is valid
316 */
317 bool ParseNonNegativeIntValue(const nsAString& aString);
318
319 /**
320 * Parse a string value into a positive integer.
321 * This method follows the rules for parsing non-negative integer from:
322 * http://dev.w3.org/html5/spec/infrastructure.html#rules-for-parsing-non-negative-integers
323 * In addition of these rules, the value has to be greater than zero.
324 *
325 * This is generally used for parsing content attributes which reflecting IDL
326 * attributes are limited to only non-negative numbers greater than zero, see:
327 * http://dev.w3.org/html5/spec/common-dom-interfaces.html#limited-to-only-non-negative-numbers-greater-than-zero
328 *
329 * @param aString the string to parse
330 * @return whether the value was valid
331 */
332 bool ParsePositiveIntValue(const nsAString& aString);
333
334 /**
335 * Parse a string into a color. This implements what HTML5 calls the
336 * "rules for parsing a legacy color value".
337 *
338 * @param aString the string to parse
339 * @return whether the value could be parsed
340 */
341 bool ParseColor(const nsAString& aString);
342
343 /**
344 * Parse a string value into a double-precision floating point value.
345 *
346 * @param aString the string to parse
347 * @return whether the value could be parsed
348 */
349 bool ParseDoubleValue(const nsAString& aString);
350
351 /**
352 * Parse a lazy URI. This just sets up the storage for the URI; it
353 * doesn't actually allocate it.
354 */
355 bool ParseLazyURIValue(const nsAString& aString);
356
357 /**
358 * Parse a margin string of format 'top, right, bottom, left' into
359 * an nsIntMargin.
360 *
361 * @param aString the string to parse
362 * @return whether the value could be parsed
363 */
364 bool ParseIntMarginValue(const nsAString& aString);
365
366 /**
367 * Convert a URL nsAttrValue to an Image nsAttrValue.
368 *
369 * @param aDocument the document this nsAttrValue belongs to.
370 */
371 void LoadImage(nsIDocument* aDocument);
372
373 /**
374 * Parse a string into a CSS style rule.
375 *
376 * @param aString the style attribute value to be parsed.
377 * @param aElement the element the attribute is set on.
378 */
379 bool ParseStyleAttribute(const nsAString& aString,
380 nsStyledElementNotElementCSSInlineStyle* aElement);
381
382 size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
383
384 private:
385 // These have to be the same as in ValueType
386 enum ValueBaseType {
387 eStringBase = eString, // 00
388 eOtherBase = 0x01, // 01
389 eAtomBase = eAtom, // 10
390 eIntegerBase = 0x03 // 11
391 };
392
393 inline ValueBaseType BaseType() const;
394 inline bool IsSVGType(ValueType aType) const;
395
396 /**
397 * Get the index of an EnumTable in the sEnumTableArray.
398 * If the EnumTable is not in the sEnumTableArray, it is added.
399 *
400 * @param aTable the EnumTable to get the index of.
401 * @return the index of the EnumTable.
402 */
403 int16_t GetEnumTableIndex(const EnumTable* aTable);
404
405 inline void SetPtrValueAndType(void* aValue, ValueBaseType aType);
406 void SetIntValueAndType(int32_t aValue, ValueType aType,
407 const nsAString* aStringValue);
408 void SetColorValue(nscolor aColor, const nsAString& aString);
409 void SetMiscAtomOrString(const nsAString* aValue);
410 void ResetMiscAtomOrString();
411 void SetSVGType(ValueType aType, const void* aValue,
412 const nsAString* aSerialized);
413 inline void ResetIfSet();
414
415 inline void* GetPtr() const;
416 inline MiscContainer* GetMiscContainer() const;
417 inline int32_t GetIntInternal() const;
418
419 // Clears the current MiscContainer. This will return null if there is no
420 // existing container.
421 MiscContainer* ClearMiscContainer();
422 // Like ClearMiscContainer, except allocates a new container if one does not
423 // exist already.
424 MiscContainer* EnsureEmptyMiscContainer();
425 bool EnsureEmptyAtomArray();
426 already_AddRefed<nsStringBuffer>
427 GetStringBuffer(const nsAString& aValue) const;
428 // aStrict is set true if stringifying the return value equals with
429 // aValue.
430 int32_t StringToInteger(const nsAString& aValue,
431 bool* aStrict,
432 nsresult* aErrorCode,
433 bool aCanBePercent = false,
434 bool* aIsPercent = nullptr) const;
435 // Given an enum table and a particular entry in that table, return
436 // the actual integer value we should store.
437 int32_t EnumTableEntryToValue(const EnumTable* aEnumTable,
438 const EnumTable* aTableEntry);
439
440 static nsTArray<const EnumTable*>* sEnumTableArray;
441
442 uintptr_t mBits;
443 };
444
445 inline const nsAttrValue&
446 nsAttrValue::operator=(const nsAttrValue& aOther)
447 {
448 SetTo(aOther);
449 return *this;
450 }
451
452 inline nsIAtom*
453 nsAttrValue::GetAtomValue() const
454 {
455 NS_PRECONDITION(Type() == eAtom, "wrong type");
456 return reinterpret_cast<nsIAtom*>(GetPtr());
457 }
458
459 inline nsAttrValue::ValueBaseType
460 nsAttrValue::BaseType() const
461 {
462 return static_cast<ValueBaseType>(mBits & NS_ATTRVALUE_BASETYPE_MASK);
463 }
464
465 inline void*
466 nsAttrValue::GetPtr() const
467 {
468 NS_ASSERTION(BaseType() != eIntegerBase,
469 "getting pointer from non-pointer");
470 return reinterpret_cast<void*>(mBits & NS_ATTRVALUE_POINTERVALUE_MASK);
471 }
472
473 inline bool
474 nsAttrValue::IsEmptyString() const
475 {
476 return !mBits;
477 }
478
479 inline void
480 nsAttrValue::ToString(mozilla::dom::DOMString& aResult) const
481 {
482 switch (Type()) {
483 case eString:
484 {
485 nsStringBuffer* str = static_cast<nsStringBuffer*>(GetPtr());
486 if (str) {
487 aResult.SetStringBuffer(str, str->StorageSize()/sizeof(char16_t) - 1);
488 }
489 // else aResult is already empty
490 return;
491 }
492 case eAtom:
493 {
494 nsIAtom *atom = static_cast<nsIAtom*>(GetPtr());
495 aResult.SetStringBuffer(atom->GetStringBuffer(), atom->GetLength());
496 break;
497 }
498 default:
499 {
500 ToString(aResult.AsAString());
501 }
502 }
503 }
504
505 #endif

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