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88f220153d
The surrounding code in this file and elsewhere uses pairs of RangedPtrs for iterators. While we're trying to modify nsString's iterators so they're more like RangedPtr, it seems reasonable to go ahead and modify this instance of nsString iterators to use RangedPtr directly for conformity with the surrounding code.
731 lines
20 KiB
C++
731 lines
20 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 "nsSMILParserUtils.h"
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#include "nsSMILKeySpline.h"
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#include "nsISMILAttr.h"
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#include "nsSMILValue.h"
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#include "nsSMILTimeValue.h"
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#include "nsSMILTimeValueSpecParams.h"
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#include "nsSMILTypes.h"
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#include "nsSMILRepeatCount.h"
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#include "nsContentUtils.h"
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#include "nsCharSeparatedTokenizer.h"
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#include "SVGContentUtils.h"
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using namespace mozilla;
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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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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
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SkipWhitespace(RangedPtr<const char16_t>& aIter,
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const RangedPtr<const char16_t>& aEnd)
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{
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while (aIter != aEnd) {
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if (!IsSVGWhitespace(*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
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ParseColon(RangedPtr<const char16_t>& aIter,
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const RangedPtr<const char16_t>& aEnd)
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{
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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
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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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{
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if (aIter == aEnd || !SVGContentUtils::IsDigit(*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 || !SVGContentUtils::IsDigit(*iter)) {
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return false;
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}
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uint32_t value = 10 * SVGContentUtils::DecimalDigitValue(*aIter) +
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SVGContentUtils::DecimalDigitValue(*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 && SVGContentUtils::IsDigit(*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
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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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{
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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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{
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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
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ParseClockValue(RangedPtr<const char16_t>& aIter,
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const RangedPtr<const char16_t>& aEnd,
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nsSMILTimeValue* aResult)
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{
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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 {
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TIMECOUNT_VALUE,
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PARTIAL_CLOCK_VALUE,
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FULL_CLOCK_VALUE
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};
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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 &&
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(*iter != '.' ||
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!SVGContentUtils::ParseNumber(iter, aEnd, fraction))) {
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return false;
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}
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aResult->SetMillis(nsSMILTime(hours) * MSEC_PER_HOUR +
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minutes * MSEC_PER_MIN +
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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(nsSMILTime(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
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ParseOffsetValue(RangedPtr<const char16_t>& aIter,
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const RangedPtr<const char16_t>& aEnd,
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nsSMILTimeValue* aResult)
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{
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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) ||
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!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
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ParseOffsetValue(const nsAString& aSpec,
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nsSMILTimeValue* aResult)
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{
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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
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ParseOptionalOffset(RangedPtr<const char16_t>& aIter,
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const RangedPtr<const char16_t>& aEnd,
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nsSMILTimeValue* aResult)
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{
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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) &&
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ParseOffsetValue(aIter, aEnd, aResult);
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}
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bool
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ParseAccessKey(const nsAString& aSpec, nsSMILTimeValueSpecParams& aResult)
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{
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MOZ_ASSERT(StringBeginsWith(aSpec, ACCESSKEY_PREFIX_CC) ||
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StringBeginsWith(aSpec, ACCESSKEY_PREFIX_LC),
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"Calling ParseAccessKey on non-accesskey-type spec");
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nsSMILTimeValueSpecParams result;
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result.mType = nsSMILTimeValueSpecParams::ACCESSKEY;
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MOZ_ASSERT(ACCESSKEY_PREFIX_LC.Length() == ACCESSKEY_PREFIX_CC.Length(),
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"Case variations for accesskey prefix differ in length");
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RangedPtr<const char16_t> iter(SVGContentUtils::GetStartRangedPtr(aSpec));
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RangedPtr<const char16_t> end(SVGContentUtils::GetEndRangedPtr(aSpec));
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iter += ACCESSKEY_PREFIX_LC.Length();
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// Expecting at least <accesskey> + ')'
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if (end - iter < 2)
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return false;
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uint32_t c = *iter++;
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// Process 32-bit codepoints
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if (NS_IS_HIGH_SURROGATE(c)) {
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if (end - iter < 2) // Expecting at least low-surrogate + ')'
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return false;
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uint32_t lo = *iter++;
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if (!NS_IS_LOW_SURROGATE(lo))
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return false;
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c = SURROGATE_TO_UCS4(c, lo);
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// XML 1.1 says that 0xFFFE and 0xFFFF are not valid characters
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} else if (NS_IS_LOW_SURROGATE(c) || c == 0xFFFE || c == 0xFFFF) {
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return false;
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}
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result.mRepeatIterationOrAccessKey = c;
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if (*iter++ != ')')
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return false;
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if (!ParseOptionalOffset(iter, end, &result.mOffset) || iter != 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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void
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MoveToNextToken(RangedPtr<const char16_t>& aIter,
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const RangedPtr<const char16_t>& aEnd,
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bool aBreakOnDot,
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bool& aIsAnyCharEscaped)
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{
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aIsAnyCharEscaped = false;
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bool isCurrentCharEscaped = false;
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while (aIter != aEnd && !IsSVGWhitespace(*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 == '-' ||
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(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<nsIAtom>
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ConvertUnescapedTokenToAtom(const nsAString& aToken)
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{
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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<nsIAtom>
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ConvertTokenToAtom(const nsAString& aToken,
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bool aUnescapeToken)
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{
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// Unescaping involves making a copy of the string which we'd like to avoid if 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
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ParseElementBaseTimeValueSpec(const nsAString& aSpec,
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nsSMILTimeValueSpecParams& aResult)
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{
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nsSMILTimeValueSpecParams 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<nsIAtom> atom =
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ConvertTokenToAtom(Substring(start.get(), tokenEnd.get()),
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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 = nsSMILTimeValueSpecParams::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 = nsSMILTimeValueSpecParams::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 = nsSMILTimeValueSpecParams::REPEAT;
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result.mRepeatIterationOrAccessKey = 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 = nsSMILTimeValueSpecParams::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 = nsSMILTimeValueSpecParams::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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//------------------------------------------------------------------------------
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// Implementation
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const nsDependentSubstring
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nsSMILParserUtils::TrimWhitespace(const nsAString& aString)
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{
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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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|
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// Skip whitespace characters at the beginning
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|
while (start != end && IsSVGWhitespace(*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 (!IsSVGWhitespace(*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
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nsSMILParserUtils::ParseKeySplines(const nsAString& aSpec,
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FallibleTArray<nsSMILKeySpline>& aKeySplines)
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|
{
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nsCharSeparatedTokenizerTemplate<IsSVGWhitespace> controlPointTokenizer(aSpec, ';');
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while (controlPointTokenizer.hasMoreTokens()) {
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nsCharSeparatedTokenizerTemplate<IsSVGWhitespace>
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tokenizer(controlPointTokenizer.nextToken(), ',',
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nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
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|
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double values[4];
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for (int i = 0 ; i < 4; i++) {
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if (!tokenizer.hasMoreTokens() ||
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!SVGContentUtils::ParseNumber(tokenizer.nextToken(), values[i]) ||
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|
values[i] > 1.0 || values[i] < 0.0) {
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return false;
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}
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|
}
|
|
if (tokenizer.hasMoreTokens() ||
|
|
tokenizer.separatorAfterCurrentToken() ||
|
|
!aKeySplines.AppendElement(nsSMILKeySpline(values[0],
|
|
values[1],
|
|
values[2],
|
|
values[3]),
|
|
fallible)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return !aKeySplines.IsEmpty();
|
|
}
|
|
|
|
bool
|
|
nsSMILParserUtils::ParseSemicolonDelimitedProgressList(const nsAString& aSpec,
|
|
bool aNonDecreasing,
|
|
FallibleTArray<double>& aArray)
|
|
{
|
|
nsCharSeparatedTokenizerTemplate<IsSVGWhitespace> 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 nsSMILParserUtils::GenericValueParser
|
|
{
|
|
public:
|
|
SMILValueParser(const SVGAnimationElement* aSrcElement,
|
|
const nsISMILAttr* aSMILAttr,
|
|
FallibleTArray<nsSMILValue>* aValuesArray,
|
|
bool* aPreventCachingOfSandwich) :
|
|
mSrcElement(aSrcElement),
|
|
mSMILAttr(aSMILAttr),
|
|
mValuesArray(aValuesArray),
|
|
mPreventCachingOfSandwich(aPreventCachingOfSandwich)
|
|
{}
|
|
|
|
virtual bool Parse(const nsAString& aValueStr) override {
|
|
nsSMILValue 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 nsISMILAttr* mSMILAttr;
|
|
FallibleTArray<nsSMILValue>* mValuesArray;
|
|
bool* mPreventCachingOfSandwich;
|
|
};
|
|
|
|
bool
|
|
nsSMILParserUtils::ParseValues(const nsAString& aSpec,
|
|
const SVGAnimationElement* aSrcElement,
|
|
const nsISMILAttr& aAttribute,
|
|
FallibleTArray<nsSMILValue>& 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
|
|
nsSMILParserUtils::ParseValuesGeneric(const nsAString& aSpec,
|
|
GenericValueParser& aParser)
|
|
{
|
|
nsCharSeparatedTokenizerTemplate<IsSVGWhitespace> tokenizer(aSpec, ';');
|
|
if (!tokenizer.hasMoreTokens()) { // Empty list
|
|
return false;
|
|
}
|
|
|
|
while (tokenizer.hasMoreTokens()) {
|
|
if (!aParser.Parse(tokenizer.nextToken())) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nsSMILParserUtils::ParseRepeatCount(const nsAString& aSpec,
|
|
nsSMILRepeatCount& aResult)
|
|
{
|
|
const nsAString& spec =
|
|
nsSMILParserUtils::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
|
|
nsSMILParserUtils::ParseTimeValueSpecParams(const nsAString& aSpec,
|
|
nsSMILTimeValueSpecParams& aResult)
|
|
{
|
|
const nsAString& spec = TrimWhitespace(aSpec);
|
|
|
|
if (spec.EqualsLiteral("indefinite")) {
|
|
aResult.mType = nsSMILTimeValueSpecParams::INDEFINITE;
|
|
return true;
|
|
}
|
|
|
|
// offset type
|
|
if (ParseOffsetValue(spec, &aResult.mOffset)) {
|
|
aResult.mType = nsSMILTimeValueSpecParams::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 ParseAccessKey(spec, aResult);
|
|
}
|
|
|
|
// event, syncbase, or repeat
|
|
return ParseElementBaseTimeValueSpec(spec, aResult);
|
|
}
|
|
|
|
bool
|
|
nsSMILParserUtils::ParseClockValue(const nsAString& aSpec,
|
|
nsSMILTimeValue* 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
|
|
nsSMILParserUtils::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 && IsSVGWhitespace(*iter)) {
|
|
++iter;
|
|
}
|
|
|
|
// Check for dash
|
|
if (iter != end && *iter == '-') {
|
|
++iter;
|
|
// Check for numeric character
|
|
if (iter != end && SVGContentUtils::IsDigit(*iter)) {
|
|
absValLocation = iter - start;
|
|
}
|
|
}
|
|
return absValLocation;
|
|
}
|