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