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Diffstat (limited to 'dom/smil/SMILParserUtils.cpp')
| -rw-r--r-- | dom/smil/SMILParserUtils.cpp | 633 |
1 files changed, 633 insertions, 0 deletions
diff --git a/dom/smil/SMILParserUtils.cpp b/dom/smil/SMILParserUtils.cpp new file mode 100644 index 0000000000..902b0ab181 --- /dev/null +++ b/dom/smil/SMILParserUtils.cpp @@ -0,0 +1,633 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "SMILParserUtils.h" + +#include "mozilla/SMILAttr.h" +#include "mozilla/SMILKeySpline.h" +#include "mozilla/SMILRepeatCount.h" +#include "mozilla/SMILTimeValue.h" +#include "mozilla/SMILTimeValueSpecParams.h" +#include "mozilla/SMILTypes.h" +#include "mozilla/SMILValue.h" +#include "mozilla/SVGContentUtils.h" +#include "mozilla/TextUtils.h" +#include "nsContentUtils.h" +#include "nsCharSeparatedTokenizer.h" + +using namespace mozilla::dom; +//------------------------------------------------------------------------------ +// Helper functions and Constants + +namespace { + +using namespace mozilla; + +const uint32_t MSEC_PER_SEC = 1000; +const uint32_t MSEC_PER_MIN = 1000 * 60; +const uint32_t MSEC_PER_HOUR = 1000 * 60 * 60; + +#define ACCESSKEY_PREFIX_LC u"accesskey("_ns // SMIL2+ +#define ACCESSKEY_PREFIX_CC u"accessKey("_ns // SVG/SMIL ANIM +#define REPEAT_PREFIX u"repeat("_ns +#define WALLCLOCK_PREFIX u"wallclock("_ns + +inline bool SkipWhitespace(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd) { + while (aIter != aEnd) { + if (!nsContentUtils::IsHTMLWhitespace(*aIter)) { + return true; + } + ++aIter; + } + return false; +} + +inline bool ParseColon(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd) { + if (aIter == aEnd || *aIter != ':') { + return false; + } + ++aIter; + return true; +} + +/* + * Exactly two digits in the range 00 - 59 are expected. + */ +bool ParseSecondsOrMinutes(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd, + uint32_t& aValue) { + if (aIter == aEnd || !mozilla::IsAsciiDigit(*aIter)) { + return false; + } + + RangedPtr<const char16_t> iter(aIter); + + if (++iter == aEnd || !mozilla::IsAsciiDigit(*iter)) { + return false; + } + + uint32_t value = 10 * mozilla::AsciiAlphanumericToNumber(*aIter) + + mozilla::AsciiAlphanumericToNumber(*iter); + if (value > 59) { + return false; + } + if (++iter != aEnd && mozilla::IsAsciiDigit(*iter)) { + return false; + } + + aValue = value; + aIter = iter; + return true; +} + +inline bool ParseClockMetric(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd, + uint32_t& aMultiplier) { + if (aIter == aEnd) { + aMultiplier = MSEC_PER_SEC; + return true; + } + + switch (*aIter) { + case 'h': + if (++aIter == aEnd) { + aMultiplier = MSEC_PER_HOUR; + return true; + } + return false; + case 'm': { + const nsAString& metric = Substring(aIter.get(), aEnd.get()); + if (metric.EqualsLiteral("min")) { + aMultiplier = MSEC_PER_MIN; + aIter = aEnd; + return true; + } + if (metric.EqualsLiteral("ms")) { + aMultiplier = 1; + aIter = aEnd; + return true; + } + } + return false; + case 's': + if (++aIter == aEnd) { + aMultiplier = MSEC_PER_SEC; + return true; + } + } + return false; +} + +/** + * See http://www.w3.org/TR/SVG/animate.html#ClockValueSyntax + */ +bool ParseClockValue(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd, + SMILTimeValue* aResult) { + if (aIter == aEnd) { + return false; + } + + // TIMECOUNT_VALUE ::= Timecount ("." Fraction)? (Metric)? + // PARTIAL_CLOCK_VALUE ::= Minutes ":" Seconds ("." Fraction)? + // FULL_CLOCK_VALUE ::= Hours ":" Minutes ":" Seconds ("." Fraction)? + enum ClockType { TIMECOUNT_VALUE, PARTIAL_CLOCK_VALUE, FULL_CLOCK_VALUE }; + + int32_t clockType = TIMECOUNT_VALUE; + + RangedPtr<const char16_t> iter(aIter); + + // Determine which type of clock value we have by counting the number + // of colons in the string. + do { + switch (*iter) { + case ':': + if (clockType == FULL_CLOCK_VALUE) { + return false; + } + ++clockType; + break; + case 'e': + case 'E': + case '-': + case '+': + // Exclude anything invalid (for clock values) + // that number parsing might otherwise allow. + return false; + } + ++iter; + } while (iter != aEnd); + + iter = aIter; + + int32_t hours = 0, timecount; + double fraction = 0.0; + uint32_t minutes, seconds, multiplier; + + switch (clockType) { + case FULL_CLOCK_VALUE: + if (!SVGContentUtils::ParseInteger(iter, aEnd, hours) || + !ParseColon(iter, aEnd)) { + return false; + } + [[fallthrough]]; + case PARTIAL_CLOCK_VALUE: + if (!ParseSecondsOrMinutes(iter, aEnd, minutes) || + !ParseColon(iter, aEnd) || + !ParseSecondsOrMinutes(iter, aEnd, seconds)) { + return false; + } + if (iter != aEnd && (*iter != '.' || !SVGContentUtils::ParseNumber( + iter, aEnd, fraction))) { + return false; + } + aResult->SetMillis(SMILTime(hours) * MSEC_PER_HOUR + + minutes * MSEC_PER_MIN + seconds * MSEC_PER_SEC + + NS_round(fraction * MSEC_PER_SEC)); + aIter = iter; + return true; + case TIMECOUNT_VALUE: + if (!SVGContentUtils::ParseInteger(iter, aEnd, timecount)) { + return false; + } + if (iter != aEnd && *iter == '.' && + !SVGContentUtils::ParseNumber(iter, aEnd, fraction)) { + return false; + } + if (!ParseClockMetric(iter, aEnd, multiplier)) { + return false; + } + aResult->SetMillis(SMILTime(timecount) * multiplier + + NS_round(fraction * multiplier)); + aIter = iter; + return true; + } + + return false; +} + +bool ParseOffsetValue(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd, + SMILTimeValue* aResult) { + RangedPtr<const char16_t> iter(aIter); + + int32_t sign; + if (!SVGContentUtils::ParseOptionalSign(iter, aEnd, sign) || + !SkipWhitespace(iter, aEnd) || !ParseClockValue(iter, aEnd, aResult)) { + return false; + } + if (sign == -1) { + aResult->SetMillis(-aResult->GetMillis()); + } + aIter = iter; + return true; +} + +bool ParseOffsetValue(const nsAString& aSpec, SMILTimeValue* aResult) { + RangedPtr<const char16_t> iter(SVGContentUtils::GetStartRangedPtr(aSpec)); + const RangedPtr<const char16_t> end(SVGContentUtils::GetEndRangedPtr(aSpec)); + + return ParseOffsetValue(iter, end, aResult) && iter == end; +} + +bool ParseOptionalOffset(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd, + SMILTimeValue* aResult) { + if (aIter == aEnd) { + aResult->SetMillis(0L); + return true; + } + + return SkipWhitespace(aIter, aEnd) && ParseOffsetValue(aIter, aEnd, aResult); +} + +void MoveToNextToken(RangedPtr<const char16_t>& aIter, + const RangedPtr<const char16_t>& aEnd, bool aBreakOnDot, + bool& aIsAnyCharEscaped) { + aIsAnyCharEscaped = false; + + bool isCurrentCharEscaped = false; + + while (aIter != aEnd && !nsContentUtils::IsHTMLWhitespace(*aIter)) { + if (isCurrentCharEscaped) { + isCurrentCharEscaped = false; + } else { + if (*aIter == '+' || *aIter == '-' || (aBreakOnDot && *aIter == '.')) { + break; + } + if (*aIter == '\\') { + isCurrentCharEscaped = true; + aIsAnyCharEscaped = true; + } + } + ++aIter; + } +} + +already_AddRefed<nsAtom> ConvertUnescapedTokenToAtom(const nsAString& aToken) { + // Whether the token is an id-ref or event-symbol it should be a valid NCName + if (aToken.IsEmpty() || NS_FAILED(nsContentUtils::CheckQName(aToken, false))) + return nullptr; + return NS_Atomize(aToken); +} + +already_AddRefed<nsAtom> ConvertTokenToAtom(const nsAString& aToken, + bool aUnescapeToken) { + // Unescaping involves making a copy of the string which we'd like to avoid if + // possible + if (!aUnescapeToken) { + return ConvertUnescapedTokenToAtom(aToken); + } + + nsAutoString token(aToken); + + const char16_t* read = token.BeginReading(); + const char16_t* const end = token.EndReading(); + char16_t* write = token.BeginWriting(); + bool escape = false; + + while (read != end) { + MOZ_ASSERT(write <= read, "Writing past where we've read"); + if (!escape && *read == '\\') { + escape = true; + ++read; + } else { + *write++ = *read++; + escape = false; + } + } + token.Truncate(write - token.BeginReading()); + + return ConvertUnescapedTokenToAtom(token); +} + +bool ParseElementBaseTimeValueSpec(const nsAString& aSpec, + SMILTimeValueSpecParams& aResult) { + SMILTimeValueSpecParams result; + + // + // The spec will probably look something like one of these + // + // element-name.begin + // element-name.event-name + // event-name + // element-name.repeat(3) + // event\.name + // + // Technically `repeat(3)' is permitted but the behaviour in this case is not + // defined (for SMIL Animation) so we don't support it here. + // + + RangedPtr<const char16_t> start(SVGContentUtils::GetStartRangedPtr(aSpec)); + RangedPtr<const char16_t> end(SVGContentUtils::GetEndRangedPtr(aSpec)); + + if (start == end) { + return false; + } + + RangedPtr<const char16_t> tokenEnd(start); + + bool requiresUnescaping; + MoveToNextToken(tokenEnd, end, true, requiresUnescaping); + + RefPtr<nsAtom> atom = ConvertTokenToAtom( + Substring(start.get(), tokenEnd.get()), requiresUnescaping); + if (atom == nullptr) { + return false; + } + + // Parse the second token if there is one + if (tokenEnd != end && *tokenEnd == '.') { + result.mDependentElemID = atom; + + ++tokenEnd; + start = tokenEnd; + MoveToNextToken(tokenEnd, end, false, requiresUnescaping); + + const nsAString& token2 = Substring(start.get(), tokenEnd.get()); + + // element-name.begin + if (token2.EqualsLiteral("begin")) { + result.mType = SMILTimeValueSpecParams::SYNCBASE; + result.mSyncBegin = true; + // element-name.end + } else if (token2.EqualsLiteral("end")) { + result.mType = SMILTimeValueSpecParams::SYNCBASE; + result.mSyncBegin = false; + // element-name.repeat(digit+) + } else if (StringBeginsWith(token2, REPEAT_PREFIX)) { + start += REPEAT_PREFIX.Length(); + int32_t repeatValue; + if (start == tokenEnd || *start == '+' || *start == '-' || + !SVGContentUtils::ParseInteger(start, tokenEnd, repeatValue)) { + return false; + } + if (start == tokenEnd || *start != ')') { + return false; + } + result.mType = SMILTimeValueSpecParams::REPEAT; + result.mRepeatIteration = repeatValue; + // element-name.event-symbol + } else { + atom = ConvertTokenToAtom(token2, requiresUnescaping); + if (atom == nullptr) { + return false; + } + result.mType = SMILTimeValueSpecParams::EVENT; + result.mEventSymbol = atom; + } + } else { + // event-symbol + result.mType = SMILTimeValueSpecParams::EVENT; + result.mEventSymbol = atom; + } + + // We've reached the end of the token, so we should now be either looking at + // a '+', '-' (possibly with whitespace before it), or the end. + if (!ParseOptionalOffset(tokenEnd, end, &result.mOffset) || tokenEnd != end) { + return false; + } + aResult = result; + return true; +} + +} // namespace + +namespace mozilla { + +//------------------------------------------------------------------------------ +// Implementation + +const nsDependentSubstring SMILParserUtils::TrimWhitespace( + const nsAString& aString) { + nsAString::const_iterator start, end; + + aString.BeginReading(start); + aString.EndReading(end); + + // Skip whitespace characters at the beginning + while (start != end && nsContentUtils::IsHTMLWhitespace(*start)) { + ++start; + } + + // Skip whitespace characters at the end. + while (end != start) { + --end; + + if (!nsContentUtils::IsHTMLWhitespace(*end)) { + // Step back to the last non-whitespace character. + ++end; + + break; + } + } + + return Substring(start, end); +} + +bool SMILParserUtils::ParseKeySplines( + const nsAString& aSpec, FallibleTArray<SMILKeySpline>& aKeySplines) { + for (const auto& controlPoint : + nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace>(aSpec, + ';') + .ToRange()) { + nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace, + nsTokenizerFlags::SeparatorOptional> + tokenizer(controlPoint, ','); + + double values[4]; + for (auto& value : values) { + if (!tokenizer.hasMoreTokens() || + !SVGContentUtils::ParseNumber(tokenizer.nextToken(), value) || + value > 1.0 || value < 0.0) { + return false; + } + } + if (tokenizer.hasMoreTokens() || tokenizer.separatorAfterCurrentToken() || + !aKeySplines.AppendElement( + SMILKeySpline(values[0], values[1], values[2], values[3]), + fallible)) { + return false; + } + } + + return !aKeySplines.IsEmpty(); +} + +bool SMILParserUtils::ParseSemicolonDelimitedProgressList( + const nsAString& aSpec, bool aNonDecreasing, + FallibleTArray<double>& aArray) { + nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace> tokenizer( + aSpec, ';'); + + double previousValue = -1.0; + + while (tokenizer.hasMoreTokens()) { + double value; + if (!SVGContentUtils::ParseNumber(tokenizer.nextToken(), value)) { + return false; + } + + if (value > 1.0 || value < 0.0 || + (aNonDecreasing && value < previousValue)) { + return false; + } + + if (!aArray.AppendElement(value, fallible)) { + return false; + } + previousValue = value; + } + + return !aArray.IsEmpty(); +} + +// Helper class for ParseValues +class MOZ_STACK_CLASS SMILValueParser + : public SMILParserUtils::GenericValueParser { + public: + SMILValueParser(const SVGAnimationElement* aSrcElement, + const SMILAttr* aSMILAttr, + FallibleTArray<SMILValue>* aValuesArray, + bool* aPreventCachingOfSandwich) + : mSrcElement(aSrcElement), + mSMILAttr(aSMILAttr), + mValuesArray(aValuesArray), + mPreventCachingOfSandwich(aPreventCachingOfSandwich) {} + + virtual bool Parse(const nsAString& aValueStr) override { + SMILValue newValue; + bool tmpPreventCachingOfSandwich = false; + if (NS_FAILED(mSMILAttr->ValueFromString(aValueStr, mSrcElement, newValue, + tmpPreventCachingOfSandwich))) + return false; + + if (!mValuesArray->AppendElement(newValue, fallible)) { + return false; + } + if (tmpPreventCachingOfSandwich) { + *mPreventCachingOfSandwich = true; + } + return true; + } + + protected: + const SVGAnimationElement* mSrcElement; + const SMILAttr* mSMILAttr; + FallibleTArray<SMILValue>* mValuesArray; + bool* mPreventCachingOfSandwich; +}; + +bool SMILParserUtils::ParseValues(const nsAString& aSpec, + const SVGAnimationElement* aSrcElement, + const SMILAttr& aAttribute, + FallibleTArray<SMILValue>& aValuesArray, + bool& aPreventCachingOfSandwich) { + // Assume all results can be cached, until we find one that can't. + aPreventCachingOfSandwich = false; + SMILValueParser valueParser(aSrcElement, &aAttribute, &aValuesArray, + &aPreventCachingOfSandwich); + return ParseValuesGeneric(aSpec, valueParser); +} + +bool SMILParserUtils::ParseValuesGeneric(const nsAString& aSpec, + GenericValueParser& aParser) { + nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace> tokenizer( + aSpec, ';'); + if (!tokenizer.hasMoreTokens()) { // Empty list + return false; + } + + while (tokenizer.hasMoreTokens()) { + if (!aParser.Parse(tokenizer.nextToken())) { + return false; + } + } + + return true; +} + +bool SMILParserUtils::ParseRepeatCount(const nsAString& aSpec, + SMILRepeatCount& aResult) { + const nsAString& spec = SMILParserUtils::TrimWhitespace(aSpec); + + if (spec.EqualsLiteral("indefinite")) { + aResult.SetIndefinite(); + return true; + } + + double value; + if (!SVGContentUtils::ParseNumber(spec, value) || value <= 0.0) { + return false; + } + aResult = value; + return true; +} + +bool SMILParserUtils::ParseTimeValueSpecParams( + const nsAString& aSpec, SMILTimeValueSpecParams& aResult) { + const nsAString& spec = TrimWhitespace(aSpec); + + if (spec.EqualsLiteral("indefinite")) { + aResult.mType = SMILTimeValueSpecParams::INDEFINITE; + return true; + } + + // offset type + if (ParseOffsetValue(spec, &aResult.mOffset)) { + aResult.mType = SMILTimeValueSpecParams::OFFSET; + return true; + } + + // wallclock type + if (StringBeginsWith(spec, WALLCLOCK_PREFIX)) { + return false; // Wallclock times not implemented + } + + // accesskey type + if (StringBeginsWith(spec, ACCESSKEY_PREFIX_LC) || + StringBeginsWith(spec, ACCESSKEY_PREFIX_CC)) { + return false; // accesskey is not supported + } + + // event, syncbase, or repeat + return ParseElementBaseTimeValueSpec(spec, aResult); +} + +bool SMILParserUtils::ParseClockValue(const nsAString& aSpec, + SMILTimeValue* aResult) { + RangedPtr<const char16_t> iter(SVGContentUtils::GetStartRangedPtr(aSpec)); + RangedPtr<const char16_t> end(SVGContentUtils::GetEndRangedPtr(aSpec)); + + return ::ParseClockValue(iter, end, aResult) && iter == end; +} + +int32_t SMILParserUtils::CheckForNegativeNumber(const nsAString& aStr) { + int32_t absValLocation = -1; + + RangedPtr<const char16_t> start(SVGContentUtils::GetStartRangedPtr(aStr)); + RangedPtr<const char16_t> iter = start; + RangedPtr<const char16_t> end(SVGContentUtils::GetEndRangedPtr(aStr)); + + // Skip initial whitespace + while (iter != end && nsContentUtils::IsHTMLWhitespace(*iter)) { + ++iter; + } + + // Check for dash + if (iter != end && *iter == '-') { + ++iter; + // Check for numeric character + if (iter != end && mozilla::IsAsciiDigit(*iter)) { + absValLocation = iter - start; + } + } + return absValLocation; +} + +} // namespace mozilla |