gecko-dev/layout/style/nsICSSParser.h

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/* parsing of CSS stylesheets, based on a token stream from the CSS scanner */

#ifndef nsICSSParser_h___
#define nsICSSParser_h___

#include "nsISupports.h"
#include "nsAString.h"
#include "nsCSSProperty.h"
#include "nsColor.h"
#include "nsCOMArray.h"

class nsICSSStyleRule;
class nsICSSStyleSheet;
class nsIUnicharInputStream;
class nsIURI;
class nsCSSDeclaration;
class nsICSSLoader;
class nsICSSRule;
class nsMediaList;

#define NS_ICSS_PARSER_IID    \
{ 0x2cb34728, 0x0f17, 0x4753, \
  {0x8e, 0xad, 0xec, 0x73, 0xe5, 0x69, 0xcd, 0xcd} }

// Rule processing function
typedef void (*PR_CALLBACK RuleAppendFunc) (nsICSSRule* aRule, void* aData);

// Interface to the css parser.
class nsICSSParser : public nsISupports {
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICSS_PARSER_IID)

  // Set a style sheet for the parser to fill in. The style sheet must
  // implement the nsICSSStyleSheet interface
  NS_IMETHOD SetStyleSheet(nsICSSStyleSheet* aSheet) = 0;

  // Set whether or not tags & classes are case sensitive or uppercased
  NS_IMETHOD SetCaseSensitive(PRBool aCaseSensitive) = 0;

  // Set whether or not to emulate Nav quirks
  NS_IMETHOD SetQuirkMode(PRBool aQuirkMode) = 0;

#ifdef  MOZ_SVG
  // Set whether or not we are in an SVG element
  NS_IMETHOD SetSVGMode(PRBool aSVGMode) = 0;
#endif

  // Set loader to use for child sheets
  NS_IMETHOD SetChildLoader(nsICSSLoader* aChildLoader) = 0;

  /**
   * @param aAllowUnsafeRules see aEnableUnsafeRules in
   * nsICSSLoader::LoadSheetSync
   */
  NS_IMETHOD Parse(nsIUnicharInputStream* aInput,
                   nsIURI*                aSheetURL,
                   nsIURI*                aBaseURI,
                   PRUint32               aLineNumber,
                   PRBool                 aAllowUnsafeRules,
                   nsICSSStyleSheet*&     aResult) = 0;

  // Parse HTML style attribute or its equivalent in other markup
  // languages.  aBaseURL is the base url to use for relative links in
  // the declaration.
  NS_IMETHOD ParseStyleAttribute(const nsAString&         aAttributeValue,
                                 nsIURI*                  aDocURL,
                                 nsIURI*                  aBaseURL,
                                 nsICSSStyleRule**        aResult) = 0;

  NS_IMETHOD ParseAndAppendDeclaration(const nsAString&         aBuffer,
                                       nsIURI*                  aSheetURL,
                                       nsIURI*                  aBaseURL,
                                       nsCSSDeclaration*        aDeclaration,
                                       PRBool                   aParseOnlyOneDecl,
                                       PRBool*                  aChanged,
                                       PRBool                   aClearOldDecl) = 0;

  NS_IMETHOD ParseRule(const nsAString&        aRule,
                       nsIURI*                 aSheetURL,
                       nsIURI*                 aBaseURL,
                       nsCOMArray<nsICSSRule>& aResult) = 0;

  NS_IMETHOD ParseProperty(const nsCSSProperty aPropID,
                           const nsAString& aPropValue,
                           nsIURI* aSheetURL,
                           nsIURI* aBaseURL,
                           nsCSSDeclaration* aDeclaration,
                           PRBool* aChanged) = 0;

  /**
   * Parse aBuffer into a media list |aMediaList|, which must be
   * non-null, replacing its current contents.  If aHTMLMode is true,
   * parse according to HTML rules, with commas as the most important
   * delimiter.  Otherwise, parse according to CSS rules, with
   * parentheses and strings more important than commas.
   */
  NS_IMETHOD ParseMediaList(const nsSubstring& aBuffer,
                            nsIURI* aURL, // for error reporting
                            PRUint32 aLineNumber, // for error reporting
                            nsMediaList* aMediaList,
                            PRBool aHTMLMode) = 0;

  /**
   * Parse aBuffer into a nscolor |aColor|.  If aHandleAlphaColors is
   * set, handle rgba()/hsla(). Will return NS_ERROR_FAILURE if
   * aBuffer is not a valid CSS color specification.
   *
   * Will also currently return NS_ERROR_FAILURE if it is not
   * self-contained (i.e.  doesn't reference any external style state,
   * such as "initial" or "inherit").
   */
  NS_IMETHOD ParseColorString(const nsSubstring& aBuffer,
                              nsIURI* aURL, // for error reporting
                              PRUint32 aLineNumber, // for error reporting
                              PRBool aHandleAlphaColors,
                              nscolor* aColor) = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsICSSParser, NS_ICSS_PARSER_IID)

nsresult
NS_NewCSSParser(nsICSSParser** aInstancePtrResult);

#endif /* nsICSSParser_h___ */