DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Untracked file

Line Code
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/* representation of simple property values within CSS declarations */

#ifndef nsCSSValue_h___
#define nsCSSValue_h___

#include "nsColor.h"
#include "nsString.h"
#include "nsCoord.h"
#include "nsCSSProperty.h"
#include "nsIURI.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsCRTGlue.h"
#include "nsStringBuffer.h"

class imgIRequest;
class nsIDocument;
class nsIPrincipal;

enum nsCSSUnit {
  eCSSUnit_Null         = 0,      // (n/a) null unit, value is not specified
  eCSSUnit_Auto         = 1,      // (n/a) value is algorithmic
  eCSSUnit_Inherit      = 2,      // (n/a) value is inherited
  eCSSUnit_Initial      = 3,      // (n/a) value is default UA value
  eCSSUnit_None         = 4,      // (n/a) value is none
  eCSSUnit_Normal       = 5,      // (n/a) value is normal (algorithmic, different than auto)
  eCSSUnit_System_Font  = 6,      // (n/a) value is -moz-use-system-font
  eCSSUnit_Dummy        = 7,      // (n/a) a fake but specified value, used
                                  //       only in temporary values
  eCSSUnit_String       = 10,     // (PRUnichar*) a string value
  eCSSUnit_Attr         = 11,     // (PRUnichar*) a attr(string) value
  eCSSUnit_Array        = 20,     // (nsCSSValue::Array*) a list of values
  eCSSUnit_Counter      = 21,     // (nsCSSValue::Array*) a counter(string,[string]) value
  eCSSUnit_Counters     = 22,     // (nsCSSValue::Array*) a counters(string,string[,string]) value
  eCSSUnit_URL          = 30,     // (nsCSSValue::URL*) value
  eCSSUnit_Image        = 31,     // (nsCSSValue::Image*) value
  eCSSUnit_Integer      = 50,     // (int) simple value
  eCSSUnit_Enumerated   = 51,     // (int) value has enumerated meaning
  eCSSUnit_EnumColor    = 80,     // (int) enumerated color (kColorKTable)
  eCSSUnit_Color        = 81,     // (nscolor) an RGBA value
  eCSSUnit_Percent      = 90,     // (float) 1.0 == 100%) value is percentage of something
  eCSSUnit_Number       = 91,     // (float) value is numeric (usually multiplier, different behavior that percent)

  // Length units - fixed
  // US English
  eCSSUnit_Inch         = 100,    // (float) 0.0254 meters
  eCSSUnit_Foot         = 101,    // (float) 12 inches
  eCSSUnit_Mile         = 102,    // (float) 5280 feet

  // Metric
  eCSSUnit_Millimeter   = 207,    // (float) 1/1000 meter
  eCSSUnit_Centimeter   = 208,    // (float) 1/100 meter
  eCSSUnit_Meter        = 210,    // (float) Standard length
  eCSSUnit_Kilometer    = 213,    // (float) 1000 meters

  // US Typographic
  eCSSUnit_Point        = 300,    // (float) 1/72 inch
  eCSSUnit_Pica         = 301,    // (float) 12 points == 1/6 inch

  // European Typographic
  eCSSUnit_Didot        = 400,    // (float) 15 didots == 16 points
  eCSSUnit_Cicero       = 401,    // (float) 12 didots

  // Length units - relative
  // Font relative measure
  eCSSUnit_EM           = 800,    // (float) == current font size
  eCSSUnit_EN           = 801,    // (float) .5 em
  eCSSUnit_XHeight      = 802,    // (float) distance from top of lower case x to baseline
  eCSSUnit_CapHeight    = 803,    // (float) distance from top of uppercase case H to baseline
  eCSSUnit_Char         = 804,    // (float) number of characters, used for width with monospace font

  // Screen relative measure
  eCSSUnit_Pixel        = 900,    // (float) CSS pixel unit

  // Angular units
  eCSSUnit_Degree       = 1000,    // (float) 360 per circle
  eCSSUnit_Grad         = 1001,    // (float) 400 per circle
  eCSSUnit_Radian       = 1002,    // (float) 2*pi per circle

  // Frequency units
  eCSSUnit_Hertz        = 2000,    // (float) 1/seconds
  eCSSUnit_Kilohertz    = 2001,    // (float) 1000 Hertz

  // Time units
  eCSSUnit_Seconds      = 3000,    // (float) Standard time
  eCSSUnit_Milliseconds = 3001     // (float) 1/1000 second
};

class nsCSSValue {
public:
  struct Array;
  friend struct Array;

  struct URL;
  friend struct URL;

  struct Image;
  friend struct Image;
  
  // for valueless units only (null, auto, inherit, none, normal)
  explicit nsCSSValue(nsCSSUnit aUnit = eCSSUnit_Null)
    : mUnit(aUnit)
  {
    NS_ASSERTION(aUnit <= eCSSUnit_Dummy, "not a valueless unit");
  }

  nsCSSValue(PRInt32 aValue, nsCSSUnit aUnit) NS_HIDDEN;
  nsCSSValue(float aValue, nsCSSUnit aUnit) NS_HIDDEN;
  nsCSSValue(const nsString& aValue, nsCSSUnit aUnit) NS_HIDDEN;
  explicit nsCSSValue(nscolor aValue) NS_HIDDEN;
  nsCSSValue(Array* aArray, nsCSSUnit aUnit) NS_HIDDEN;
  explicit nsCSSValue(URL* aValue) NS_HIDDEN;
  explicit nsCSSValue(Image* aValue) NS_HIDDEN;
  nsCSSValue(const nsCSSValue& aCopy) NS_HIDDEN;
  ~nsCSSValue() { Reset(); }

  NS_HIDDEN_(nsCSSValue&)  operator=(const nsCSSValue& aCopy);
  NS_HIDDEN_(PRBool)      operator==(const nsCSSValue& aOther) const;

  PRBool operator!=(const nsCSSValue& aOther) const
  {
    return !(*this == aOther);
  }

  nsCSSUnit GetUnit() const { return mUnit; }
  PRBool    IsLengthUnit() const
    { return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Pixel)); }
  PRBool    IsFixedLengthUnit() const  
    { return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Cicero)); }
  PRBool    IsRelativeLengthUnit() const  
    { return PRBool((eCSSUnit_EM <= mUnit) && (mUnit <= eCSSUnit_Pixel)); }
  PRBool    IsAngularUnit() const  
    { return PRBool((eCSSUnit_Degree <= mUnit) && (mUnit <= eCSSUnit_Radian)); }
  PRBool    IsFrequencyUnit() const  
    { return PRBool((eCSSUnit_Hertz <= mUnit) && (mUnit <= eCSSUnit_Kilohertz)); }
  PRBool    IsTimeUnit() const  
    { return PRBool((eCSSUnit_Seconds <= mUnit) && (mUnit <= eCSSUnit_Milliseconds)); }

  PRInt32 GetIntValue() const
  {
    NS_ASSERTION(mUnit == eCSSUnit_Integer || mUnit == eCSSUnit_Enumerated ||
                 mUnit == eCSSUnit_EnumColor,
                 "not an int value");
    return mValue.mInt;
  }

  float GetPercentValue() const
  {
    NS_ASSERTION(mUnit == eCSSUnit_Percent, "not a percent value");
    return mValue.mFloat;
  }

  float GetFloatValue() const
  {
    NS_ASSERTION(eCSSUnit_Number <= mUnit, "not a float value");
    return mValue.mFloat;
  }

  nsAString& GetStringValue(nsAString& aBuffer) const
  {
    NS_ASSERTION(eCSSUnit_String <= mUnit && mUnit <= eCSSUnit_Attr,
                 "not a string value");
    aBuffer.Truncate();
    PRUint32 len = NS_strlen(GetBufferValue(mValue.mString));
    mValue.mString->ToString(len, aBuffer);
    return aBuffer;
  }

  const PRUnichar* GetStringBufferValue() const
  {
    NS_ASSERTION(eCSSUnit_String <= mUnit && mUnit <= eCSSUnit_Attr,
                 "not a string value");
    return GetBufferValue(mValue.mString);
  }

  nscolor GetColorValue() const
  {
    NS_ASSERTION((mUnit == eCSSUnit_Color), "not a color value");
    return mValue.mColor;
  }

  PRBool IsNonTransparentColor() const;

  Array* GetArrayValue() const
  {
    NS_ASSERTION(eCSSUnit_Array <= mUnit && mUnit <= eCSSUnit_Counters,
                 "not an array value");
    return mValue.mArray;
  }

  nsIURI* GetURLValue() const
  {
    NS_ASSERTION(mUnit == eCSSUnit_URL || mUnit == eCSSUnit_Image,
                 "not a URL value");
    return mUnit == eCSSUnit_URL ?
      mValue.mURL->mURI : mValue.mImage->mURI;
  }

  URL* GetURLStructValue() const
  {
    // Not allowing this for Image values, because if the caller takes
    // a ref to them they won't be able to delete them properly.
    NS_ASSERTION(mUnit == eCSSUnit_URL, "not a URL value");
    return mValue.mURL;
  }

  const PRUnichar* GetOriginalURLValue() const
  {
    NS_ASSERTION(mUnit == eCSSUnit_URL || mUnit == eCSSUnit_Image,
                 "not a URL value");
    return GetBufferValue(mUnit == eCSSUnit_URL ?
                            mValue.mURL->mString :
                            mValue.mImage->mString);
  }

  // Not making this inline because that would force us to include
  // imgIRequest.h, which leads to REQUIRES hell, since this header is included
  // all over.
  NS_HIDDEN_(imgIRequest*) GetImageValue() const;

  NS_HIDDEN_(nscoord)   GetLengthTwips() const;

  NS_HIDDEN_(void)  Reset()  // sets to null
  {
    if (mUnit != eCSSUnit_Null)
      DoReset();
  }
private:
  NS_HIDDEN_(void)  DoReset();

public:
  NS_HIDDEN_(void)  SetIntValue(PRInt32 aValue, nsCSSUnit aUnit);
  NS_HIDDEN_(void)  SetPercentValue(float aValue);
  NS_HIDDEN_(void)  SetFloatValue(float aValue, nsCSSUnit aUnit);
  NS_HIDDEN_(void)  SetStringValue(const nsString& aValue, nsCSSUnit aUnit);
  NS_HIDDEN_(void)  SetColorValue(nscolor aValue);
  NS_HIDDEN_(void)  SetArrayValue(nsCSSValue::Array* aArray, nsCSSUnit aUnit);
  NS_HIDDEN_(void)  SetURLValue(nsCSSValue::URL* aURI);
  NS_HIDDEN_(void)  SetImageValue(nsCSSValue::Image* aImage);
  NS_HIDDEN_(void)  SetAutoValue();
  NS_HIDDEN_(void)  SetInheritValue();
  NS_HIDDEN_(void)  SetInitialValue();
  NS_HIDDEN_(void)  SetNoneValue();
  NS_HIDDEN_(void)  SetNormalValue();
  NS_HIDDEN_(void)  SetSystemFontValue();
  NS_HIDDEN_(void)  SetDummyValue();
  NS_HIDDEN_(void)  StartImageLoad(nsIDocument* aDocument)
                                   const;  // Not really const, but pretending

  // Returns an already addrefed buffer.  Can return null on allocation
  // failure.
  static nsStringBuffer* BufferFromString(const nsString& aValue);
  
  struct Array {

    // return |Array| with reference count of zero
    static Array* Create(PRUint16 aItemCount) {
      return new (aItemCount) Array(aItemCount);
    }

    nsCSSValue& operator[](PRUint16 aIndex) {
      NS_ASSERTION(aIndex < mCount, "out of range");
      return *(First() + aIndex);
    }

    const nsCSSValue& operator[](PRUint16 aIndex) const {
      NS_ASSERTION(aIndex < mCount, "out of range");
      return *(First() + aIndex);
    }

    nsCSSValue& Item(PRUint16 aIndex) { return (*this)[aIndex]; }
    const nsCSSValue& Item(PRUint16 aIndex) const { return (*this)[aIndex]; }

    PRUint16 Count() const { return mCount; }

    PRBool operator==(const Array& aOther) const
    {
      if (mCount != aOther.mCount)
        return PR_FALSE;
      for (PRUint16 i = 0; i < mCount; ++i)
        if ((*this)[i] != aOther[i])
          return PR_FALSE;
      return PR_TRUE;
    }

    void AddRef() {
      if (mRefCnt == PR_UINT16_MAX) {
        NS_WARNING("refcount overflow, leaking nsCSSValue::Array");
        return;
      }
      ++mRefCnt;
      NS_LOG_ADDREF(this, mRefCnt, "nsCSSValue::Array", sizeof(*this));
    }
    void Release() {
      if (mRefCnt == PR_UINT16_MAX) {
        NS_WARNING("refcount overflow, leaking nsCSSValue::Array");
        return;
      }
      --mRefCnt;
      NS_LOG_RELEASE(this, mRefCnt, "nsCSSValue::Array");
      if (mRefCnt == 0)
        delete this;
    }

  private:

    PRUint16 mRefCnt;
    PRUint16 mCount;

    void* operator new(size_t aSelfSize, PRUint16 aItemCount) CPP_THROW_NEW {
      return ::operator new(aSelfSize + sizeof(nsCSSValue)*aItemCount);
    }

    void operator delete(void* aPtr) { ::operator delete(aPtr); }

    nsCSSValue* First() {
      return (nsCSSValue*) (((char*)this) + sizeof(*this));
    }

    const nsCSSValue* First() const {
      return (const nsCSSValue*) (((const char*)this) + sizeof(*this));
    }

#define CSSVALUE_LIST_FOR_VALUES(var)                                         \
  for (nsCSSValue *var = First(), *var##_end = var + mCount;                  \
       var != var##_end; ++var)

    Array(PRUint16 aItemCount)
      : mRefCnt(0)
      , mCount(aItemCount)
    {
      MOZ_COUNT_CTOR(nsCSSValue::Array);
      CSSVALUE_LIST_FOR_VALUES(val) {
        new (val) nsCSSValue();
      }
    }

    ~Array()
    {
      MOZ_COUNT_DTOR(nsCSSValue::Array);
      CSSVALUE_LIST_FOR_VALUES(val) {
        val->~nsCSSValue();
      }
    }

#undef CSSVALUE_LIST_FOR_VALUES

  private:
    Array(const Array& aOther); // not to be implemented
  };

  struct URL {
    // Methods are not inline because using an nsIPrincipal means requiring
    // caps, which leads to REQUIRES hell, since this header is included all
    // over.    

    // aString must not be null.
    // aOriginPrincipal must not be null.
    URL(nsIURI* aURI, nsStringBuffer* aString, nsIURI* aReferrer,
        nsIPrincipal* aOriginPrincipal) NS_HIDDEN;

    ~URL() NS_HIDDEN;

    NS_HIDDEN_(PRBool) operator==(const URL& aOther) const;

    // URIEquals only compares URIs and principals (unlike operator==, which
    // also compares the original strings).  URIEquals also assumes that the
    // mURI member of both URL objects is non-null.  Do NOT call this method
    // unless you're sure this is the case.
    NS_HIDDEN_(PRBool) URIEquals(const URL& aOther) const;

    nsCOMPtr<nsIURI> mURI; // null == invalid URL
    nsStringBuffer* mString; // Could use nsRefPtr, but it'd add useless
                             // null-checks; this is never null.
    nsCOMPtr<nsIURI> mReferrer;
    nsCOMPtr<nsIPrincipal> mOriginPrincipal;

    void AddRef() { ++mRefCnt; }
    void Release() { if (--mRefCnt == 0) delete this; }
  protected:
    nsrefcnt mRefCnt;
  };

  struct Image : public URL {
    // Not making the constructor and destructor inline because that would
    // force us to include imgIRequest.h, which leads to REQUIRES hell, since
    // this header is included all over.
    // aString must not be null.
    Image(nsIURI* aURI, nsStringBuffer* aString, nsIURI* aReferrer,
          nsIPrincipal* aOriginPrincipal, nsIDocument* aDocument) NS_HIDDEN;
    ~Image() NS_HIDDEN;

    // Inherit operator== from nsCSSValue::URL

    nsCOMPtr<imgIRequest> mRequest; // null == image load blocked or somehow failed

    // Override AddRef/Release so we delete ourselves via the right pointer.
    void AddRef() { ++mRefCnt; }
    void Release() { if (--mRefCnt == 0) delete this; }
  };

private:
  static const PRUnichar* GetBufferValue(nsStringBuffer* aBuffer) {
    return static_cast<PRUnichar*>(aBuffer->Data());
  }

protected:
  nsCSSUnit mUnit;
  union {
    PRInt32    mInt;
    float      mFloat;
    // Note: the capacity of the buffer may exceed the length of the string.
    // If we're of a string type, mString is not null.
    nsStringBuffer* mString;
    nscolor    mColor;
    Array*     mArray;
    URL*       mURL;
    Image*     mImage;
  }         mValue;
};

#endif /* nsCSSValue_h___ */