зеркало из https://github.com/mozilla/gecko-dev.git
112 строки
4.4 KiB
C++
112 строки
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef NS_SMILPARSERUTILS_H_
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#define NS_SMILPARSERUTILS_H_
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#include "nscore.h"
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#include "nsTArray.h"
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#include "nsString.h"
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class nsISMILAttr;
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class nsSMILTimeValue;
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class nsSMILValue;
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class nsSMILRepeatCount;
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class nsSMILTimeValueSpecParams;
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namespace mozilla {
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namespace dom {
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class SVGAnimationElement;
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}
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}
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/**
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* Common parsing utilities for the SMIL module. There is little re-use here; it
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* simply serves to simplify other classes by moving parsing outside and to aid
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* unit testing.
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*/
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class nsSMILParserUtils
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{
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public:
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// Abstract helper-class for assisting in parsing |values| attribute
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class GenericValueParser {
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public:
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virtual nsresult Parse(const nsAString& aValueStr) = 0;
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};
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static nsresult ParseKeySplines(const nsAString& aSpec,
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nsTArray<double>& aSplineArray);
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// Used for parsing the |keyTimes| and |keyPoints| attributes.
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static nsresult ParseSemicolonDelimitedProgressList(const nsAString& aSpec,
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bool aNonDecreasing,
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nsTArray<double>& aArray);
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static nsresult ParseValues(const nsAString& aSpec,
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const mozilla::dom::SVGAnimationElement* aSrcElement,
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const nsISMILAttr& aAttribute,
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nsTArray<nsSMILValue>& aValuesArray,
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bool& aPreventCachingOfSandwich);
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// Generic method that will run some code on each sub-section of an animation
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// element's "values" list.
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static nsresult ParseValuesGeneric(const nsAString& aSpec,
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GenericValueParser& aParser);
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static nsresult ParseRepeatCount(const nsAString& aSpec,
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nsSMILRepeatCount& aResult);
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static nsresult ParseTimeValueSpecParams(const nsAString& aSpec,
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nsSMILTimeValueSpecParams& aResult);
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// Used with ParseClockValue. Allow + or - before a clock value.
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static const int8_t kClockValueAllowSign = 1;
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// Used with ParseClockValue. Allow "indefinite" in a clock value
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static const int8_t kClockValueAllowIndefinite = 2;
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/*
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* This method can actually parse more than a clock value as defined in the
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* SMIL Animation specification. It can also parse:
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* - the + or - before an offset
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* - the special value "indefinite"
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* - the special value "media"
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*
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* Because the value "media" cannot be represented as part of an
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* nsSMILTimeValue and has different meanings depending on where it is used,
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* it is passed out as a separate parameter (which can be set to nullptr if the
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* media attribute is not allowed).
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*
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* @param aSpec The string containing a clock value, e.g. "10s"
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* @param aResult The parsed result. May be nullptr (e.g. if this method is
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* being called just to test if aSpec is a valid clock value).
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* [OUT]
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* @param aFlags A combination of the kClockValue* bit flags OR'ed together
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* to define what additional syntax is allowed.
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* @param aIsMedia Optional out parameter which, if not null, will be set to
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* true if the value is the string "media", false
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* otherwise. If it is null, the string "media" is not
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* allowed.
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*
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* @return NS_OK if aSpec was successfully parsed as a valid clock value
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* (according to aFlags), an error code otherwise.
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*/
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static nsresult ParseClockValue(const nsAString& aSpec,
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nsSMILTimeValue* aResult,
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uint32_t aFlags = 0,
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bool* aIsMedia = nullptr);
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/*
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* This method checks whether the given string looks like a negative number.
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* Specifically, it checks whether the string looks matches the pattern
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* "[whitespace]*-[numeral].*" If the string matches this pattern, this
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* method returns the index of the first character after the '-' sign
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* (i.e. the index of the absolute value). If not, this method returns -1.
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*/
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static int32_t CheckForNegativeNumber(const nsAString& aStr);
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};
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#endif // NS_SMILPARSERUTILS_H_
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