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Diffstat (limited to '')
| -rw-r--r-- | accessible/base/ARIAStateMap.cpp | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/accessible/base/ARIAStateMap.cpp b/accessible/base/ARIAStateMap.cpp new file mode 100644 index 0000000000..6bf20cf1cc --- /dev/null +++ b/accessible/base/ARIAStateMap.cpp @@ -0,0 +1,334 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=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 "ARIAMap.h" +#include "nsAccUtils.h" +#include "States.h" + +#include "mozilla/dom/Element.h" + +using namespace mozilla; +using namespace mozilla::a11y; +using namespace mozilla::a11y::aria; + +/** + * Used to store state map rule data for ARIA attribute of enum type. + */ +struct EnumTypeData { + // ARIA attribute name. + nsStaticAtom* const mAttrName; + + // States if the attribute value is matched to the enum value. Used as + // Element::AttrValuesArray, last item must be nullptr. + nsStaticAtom* const mValues[4]; + + // States applied if corresponding enum values are matched. + const uint64_t mStates[3]; + + // States to clear in case of match. + const uint64_t mClearState; +}; + +enum ETokenType { + eBoolType = 0, + eMixedType = 1, // can take 'mixed' value + eDefinedIfAbsent = 2 // permanent and false state are applied if absent +}; + +/** + * Used to store state map rule data for ARIA attribute of token type (including + * mixed value). + */ +struct TokenTypeData { + TokenTypeData(nsAtom* aAttrName, uint32_t aType, uint64_t aPermanentState, + uint64_t aTrueState, uint64_t aFalseState = 0) + : mAttrName(aAttrName), + mType(aType), + mPermanentState(aPermanentState), + mTrueState(aTrueState), + mFalseState(aFalseState) {} + + // ARIA attribute name. + nsAtom* const mAttrName; + + // Type. + const uint32_t mType; + + // State applied if the attribute is defined or mType doesn't have + // eDefinedIfAbsent flag set. + const uint64_t mPermanentState; + + // States applied if the attribute value is true/false. + const uint64_t mTrueState; + const uint64_t mFalseState; +}; + +/** + * Map enum type attribute value to accessible state. + */ +static void MapEnumType(dom::Element* aElement, uint64_t* aState, + const EnumTypeData& aData); + +/** + * Map token type attribute value to states. + */ +static void MapTokenType(dom::Element* aContent, uint64_t* aState, + const TokenTypeData& aData); + +bool aria::MapToState(EStateRule aRule, dom::Element* aElement, + uint64_t* aState) { + switch (aRule) { + case eARIAAutoComplete: { + static const EnumTypeData data = { + nsGkAtoms::aria_autocomplete, + {nsGkAtoms::inlinevalue, nsGkAtoms::list_, nsGkAtoms::both, nullptr}, + {states::SUPPORTS_AUTOCOMPLETION, + states::HASPOPUP | states::SUPPORTS_AUTOCOMPLETION, + states::HASPOPUP | states::SUPPORTS_AUTOCOMPLETION}, + 0}; + + MapEnumType(aElement, aState, data); + return true; + } + + case eARIABusy: { + static const EnumTypeData data = { + nsGkAtoms::aria_busy, + {nsGkAtoms::_true, nsGkAtoms::error, nullptr}, + {states::BUSY, states::INVALID}, + 0}; + + MapEnumType(aElement, aState, data); + return true; + } + + case eARIACheckableBool: { + static const TokenTypeData data(nsGkAtoms::aria_checked, + eBoolType | eDefinedIfAbsent, + states::CHECKABLE, states::CHECKED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIACheckableMixed: { + static const TokenTypeData data(nsGkAtoms::aria_checked, + eMixedType | eDefinedIfAbsent, + states::CHECKABLE, states::CHECKED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIACheckedMixed: { + static const TokenTypeData data(nsGkAtoms::aria_checked, eMixedType, + states::CHECKABLE, states::CHECKED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIACurrent: { + static const TokenTypeData data(nsGkAtoms::aria_current, eBoolType, 0, + states::CURRENT); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIADisabled: { + static const TokenTypeData data(nsGkAtoms::aria_disabled, eBoolType, 0, + states::UNAVAILABLE); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAExpanded: { + static const TokenTypeData data(nsGkAtoms::aria_expanded, eBoolType, 0, + states::EXPANDED, states::COLLAPSED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAHasPopup: { + static const TokenTypeData data(nsGkAtoms::aria_haspopup, eBoolType, 0, + states::HASPOPUP); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAInvalid: { + static const TokenTypeData data(nsGkAtoms::aria_invalid, eBoolType, 0, + states::INVALID); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAModal: { + static const TokenTypeData data(nsGkAtoms::aria_modal, eBoolType, 0, + states::MODAL); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAMultiline: { + static const TokenTypeData data(nsGkAtoms::aria_multiline, + eBoolType | eDefinedIfAbsent, 0, + states::MULTI_LINE, states::SINGLE_LINE); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAMultiSelectable: { + static const TokenTypeData data( + nsGkAtoms::aria_multiselectable, eBoolType, 0, + states::MULTISELECTABLE | states::EXTSELECTABLE); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAOrientation: { + static const EnumTypeData data = { + nsGkAtoms::aria_orientation, + {nsGkAtoms::horizontal, nsGkAtoms::vertical, nullptr}, + {states::HORIZONTAL, states::VERTICAL}, + states::HORIZONTAL | states::VERTICAL}; + + MapEnumType(aElement, aState, data); + return true; + } + + case eARIAPressed: { + static const TokenTypeData data(nsGkAtoms::aria_pressed, eMixedType, 0, + states::PRESSED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAReadonly: { + static const TokenTypeData data(nsGkAtoms::aria_readonly, eBoolType, 0, + states::READONLY); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIAReadonlyOrEditable: { + static const TokenTypeData data(nsGkAtoms::aria_readonly, + eBoolType | eDefinedIfAbsent, 0, + states::READONLY, states::EDITABLE); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIARequired: { + static const TokenTypeData data(nsGkAtoms::aria_required, eBoolType, 0, + states::REQUIRED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIASelectable: { + static const TokenTypeData data(nsGkAtoms::aria_selected, + eBoolType | eDefinedIfAbsent, + states::SELECTABLE, states::SELECTED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eARIASelectableIfDefined: { + static const TokenTypeData data(nsGkAtoms::aria_selected, eBoolType, + states::SELECTABLE, states::SELECTED); + + MapTokenType(aElement, aState, data); + return true; + } + + case eReadonlyUntilEditable: { + if (!(*aState & states::EDITABLE)) *aState |= states::READONLY; + + return true; + } + + case eIndeterminateIfNoValue: { + if (!nsAccUtils::HasARIAAttr(aElement, nsGkAtoms::aria_valuenow) && + !nsAccUtils::HasARIAAttr(aElement, nsGkAtoms::aria_valuetext)) { + *aState |= states::MIXED; + } + + return true; + } + + case eFocusableUntilDisabled: { + if (!nsAccUtils::HasDefinedARIAToken(aElement, + nsGkAtoms::aria_disabled) || + nsAccUtils::ARIAAttrValueIs(aElement, nsGkAtoms::aria_disabled, + nsGkAtoms::_false, eCaseMatters)) { + *aState |= states::FOCUSABLE; + } + + return true; + } + + default: + return false; + } +} + +static void MapEnumType(dom::Element* aElement, uint64_t* aState, + const EnumTypeData& aData) { + switch (nsAccUtils::FindARIAAttrValueIn(aElement, aData.mAttrName, + aData.mValues, eCaseMatters)) { + case 0: + *aState = (*aState & ~aData.mClearState) | aData.mStates[0]; + return; + case 1: + *aState = (*aState & ~aData.mClearState) | aData.mStates[1]; + return; + case 2: + *aState = (*aState & ~aData.mClearState) | aData.mStates[2]; + return; + } +} + +static void MapTokenType(dom::Element* aElement, uint64_t* aState, + const TokenTypeData& aData) { + if (nsAccUtils::HasDefinedARIAToken(aElement, aData.mAttrName)) { + if (nsAccUtils::ARIAAttrValueIs(aElement, aData.mAttrName, nsGkAtoms::mixed, + eCaseMatters)) { + if (aData.mType & eMixedType) { + *aState |= aData.mPermanentState | states::MIXED; + } else { // unsupported use of 'mixed' is an authoring error + *aState |= aData.mPermanentState | aData.mFalseState; + } + return; + } + + if (nsAccUtils::ARIAAttrValueIs(aElement, aData.mAttrName, + nsGkAtoms::_false, eCaseMatters)) { + *aState |= aData.mPermanentState | aData.mFalseState; + return; + } + + *aState |= aData.mPermanentState | aData.mTrueState; + return; + } + + if (aData.mType & eDefinedIfAbsent) { + *aState |= aData.mPermanentState | aData.mFalseState; + } +} |