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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/KeyframeEffectParams.h"
#include "mozilla/AnimationUtils.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/KeyframeUtils.h"
#include "mozilla/RangedPtr.h"
#include "nsReadableUtils.h"
namespace mozilla {
static inline bool
IsLetter(char16_t aCh)
{
return (0x41 <= aCh && aCh <= 0x5A) || (0x61 <= aCh && aCh <= 0x7A);
}
static inline bool
IsDigit(char16_t aCh)
{
return 0x30 <= aCh && aCh <= 0x39;
}
static inline bool
IsNameStartCode(char16_t aCh)
{
return IsLetter(aCh) || aCh >= 0x80 || aCh == '_';
}
static inline bool
IsNameCode(char16_t aCh)
{
return IsNameStartCode(aCh) || IsDigit(aCh) || aCh == '-';
}
static inline bool
IsNewLine(char16_t aCh)
{
// 0x0A (LF), 0x0C (FF), 0x0D (CR), or pairs of CR followed by LF are
// replaced by LF.
return aCh == 0x0A || aCh == 0x0C || aCh == 0x0D;
}
static inline bool
IsValidEscape(char16_t aFirst, char16_t aSecond)
{
return aFirst == '\\' && !IsNewLine(aSecond);
}
static bool
IsIdentStart(RangedPtr<const char16_t> aIter,
const char16_t* const aEnd)
{
if (aIter == aEnd) {
return false;
}
if (*aIter == '-') {
if (aIter + 1 == aEnd) {
return false;
}
char16_t second = *(aIter + 1);
return IsNameStartCode(second) ||
second == '-' ||
(aIter + 2 != aEnd && IsValidEscape(second, *(aIter + 2)));
}
return IsNameStartCode(*aIter) ||
(aIter + 1 != aEnd && IsValidEscape(*aIter, *(aIter + 1)));
}
static void
ConsumeIdentToken(RangedPtr<const char16_t>& aIter,
const char16_t* const aEnd,
nsAString& aResult)
{
aResult.Truncate();
// Check if it starts with an identifier.
if (!IsIdentStart(aIter, aEnd)) {
return;
}
// Start to consume.
while (aIter != aEnd) {
if (IsNameCode(*aIter)) {
aResult.Append(*aIter);
} else if (*aIter == '\\') {
const RangedPtr<const char16_t> secondChar = aIter + 1;
if (secondChar == aEnd || !IsValidEscape(*aIter, *secondChar)) {
break;
}
// Consume '\\' and append the character following this '\\'.
++aIter;
aResult.Append(*aIter);
} else {
break;
}
++aIter;
}
}
/* static */ void
KeyframeEffectParams::ParseSpacing(const nsAString& aSpacing,
SpacingMode& aSpacingMode,
nsCSSPropertyID& aPacedProperty,
nsAString& aInvalidPacedProperty,
ErrorResult& aRv)
{
aInvalidPacedProperty.Truncate();
// Ignore spacing if the core API is not enabled since it is not yet ready to
// ship.
if (!AnimationUtils::IsCoreAPIEnabledForCaller()) {
aSpacingMode = SpacingMode::distribute;
return;
}
// Parse spacing.
// distribute | paced({ident})
// https://w3c.github.io/web-animations/#dom-keyframeeffectreadonly-spacing
// 1. distribute spacing.
if (aSpacing.EqualsLiteral("distribute")) {
aSpacingMode = SpacingMode::distribute;
return;
}
// 2. paced spacing.
static const nsLiteralString kPacedPrefix = NS_LITERAL_STRING("paced(");
if (!StringBeginsWith(aSpacing, kPacedPrefix)) {
aRv.ThrowTypeError<dom::MSG_INVALID_SPACING_MODE_ERROR>(aSpacing);
return;
}
RangedPtr<const char16_t> iter(aSpacing.Data() + kPacedPrefix.Length(),
aSpacing.Data(), aSpacing.Length());
const char16_t* const end = aSpacing.EndReading();
nsAutoString identToken;
ConsumeIdentToken(iter, end, identToken);
if (identToken.IsEmpty()) {
aRv.ThrowTypeError<dom::MSG_INVALID_SPACING_MODE_ERROR>(aSpacing);
return;
}
aPacedProperty =
nsCSSProps::LookupProperty(identToken, CSSEnabledState::eForAllContent);
if (aPacedProperty == eCSSProperty_UNKNOWN ||
aPacedProperty == eCSSPropertyExtra_variable ||
!KeyframeUtils::IsAnimatableProperty(aPacedProperty)) {
aPacedProperty = eCSSProperty_UNKNOWN;
aInvalidPacedProperty = identToken;
}
if (end - iter.get() != 1 || *iter != ')') {
aRv.ThrowTypeError<dom::MSG_INVALID_SPACING_MODE_ERROR>(aSpacing);
return;
}
aSpacingMode = aPacedProperty == eCSSProperty_UNKNOWN
? SpacingMode::distribute
: SpacingMode::paced;
}
} // namespace mozilla
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