/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { unwrapSafeValue } from '../../sanitization/bypass';
import { keyValueArrayGet, keyValueArraySet } from '../../util/array_utils';
import { assertDefined, assertEqual, assertLessThan, assertNotEqual, throwError } from '../../util/assert';
import { EMPTY_ARRAY } from '../../util/empty';
import { concatStringsWithSpace, stringify } from '../../util/stringify';
import { assertFirstUpdatePass } from '../assert';
import { bindingUpdated } from '../bindings';
import { getTStylingRangeNext, getTStylingRangeNextDuplicate, getTStylingRangePrev, getTStylingRangePrevDuplicate } from '../interfaces/styling';
import { RENDERER } from '../interfaces/view';
import { applyStyling } from '../node_manipulation';
import { getCurrentDirectiveDef, getLView, getSelectedIndex, getTView, incrementBindingIndex } from '../state';
import { insertTStylingBinding } from '../styling/style_binding_list';
import { getLastParsedKey, getLastParsedValue, parseClassName, parseClassNameNext, parseStyle, parseStyleNext } from '../styling/styling_parser';
import { NO_CHANGE } from '../tokens';
import { getNativeByIndex } from '../util/view_utils';
import { setDirectiveInputsWhichShadowsStyling } from './property';
/**
 * Update a style binding on an element with the provided value.
 *
 * If the style value is falsy then it will be removed from the element
 * (or assigned a different value depending if there are any styles placed
 * on the element with `styleMap` or any static styles that are
 * present from when the element was created with `styling`).
 *
 * Note that the styling element is updated as part of `stylingApply`.
 *
 * @param prop A valid CSS property.
 * @param value New value to write (`null` or an empty string to remove).
 * @param suffix Optional suffix. Used with scalar values to add unit such as `px`.
 *
 * Note that this will apply the provided style value to the host element if this function is called
 * within a host binding function.
 *
 * @codeGenApi
 */
export function ɵɵstyleProp(prop, value, suffix) {
    checkStylingProperty(prop, value, suffix, false);
    return ɵɵstyleProp;
}
/**
 * Update a class binding on an element with the provided value.
 *
 * This instruction is meant to handle the `[class.foo]="exp"` case and,
 * therefore, the class binding itself must already be allocated using
 * `styling` within the creation block.
 *
 * @param prop A valid CSS class (only one).
 * @param value A true/false value which will turn the class on or off.
 *
 * Note that this will apply the provided class value to the host element if this function
 * is called within a host binding function.
 *
 * @codeGenApi
 */
export function ɵɵclassProp(className, value) {
    checkStylingProperty(className, value, null, true);
    return ɵɵclassProp;
}
/**
 * Update style bindings using an object literal on an element.
 *
 * This instruction is meant to apply styling via the `[style]="exp"` template bindings.
 * When styles are applied to the element they will then be updated with respect to
 * any styles/classes set via `styleProp`. If any styles are set to falsy
 * then they will be removed from the element.
 *
 * Note that the styling instruction will not be applied until `stylingApply` is called.
 *
 * @param styles A key/value style map of the styles that will be applied to the given element.
 *        Any missing styles (that have already been applied to the element beforehand) will be
 *        removed (unset) from the element's styling.
 *
 * Note that this will apply the provided styleMap value to the host element if this function
 * is called within a host binding.
 *
 * @codeGenApi
 */
export function ɵɵstyleMap(styles) {
    checkStylingMap(styleKeyValueArraySet, styleStringParser, styles, false);
}
/**
 * Parse text as style and add values to KeyValueArray.
 *
 * This code is pulled out to a separate function so that it can be tree shaken away if it is not
 * needed. It is only referenced from `ɵɵstyleMap`.
 *
 * @param keyValueArray KeyValueArray to add parsed values to.
 * @param text text to parse.
 */
export function styleStringParser(keyValueArray, text) {
    for (let i = parseStyle(text); i >= 0; i = parseStyleNext(text, i)) {
        styleKeyValueArraySet(keyValueArray, getLastParsedKey(text), getLastParsedValue(text));
    }
}
/**
 * Update class bindings using an object literal or class-string on an element.
 *
 * This instruction is meant to apply styling via the `[class]="exp"` template bindings.
 * When classes are applied to the element they will then be updated with
 * respect to any styles/classes set via `classProp`. If any
 * classes are set to falsy then they will be removed from the element.
 *
 * Note that the styling instruction will not be applied until `stylingApply` is called.
 * Note that this will the provided classMap value to the host element if this function is called
 * within a host binding.
 *
 * @param classes A key/value map or string of CSS classes that will be added to the
 *        given element. Any missing classes (that have already been applied to the element
 *        beforehand) will be removed (unset) from the element's list of CSS classes.
 *
 * @codeGenApi
 */
export function ɵɵclassMap(classes) {
    checkStylingMap(keyValueArraySet, classStringParser, classes, true);
}
/**
 * Parse text as class and add values to KeyValueArray.
 *
 * This code is pulled out to a separate function so that it can be tree shaken away if it is not
 * needed. It is only referenced from `ɵɵclassMap`.
 *
 * @param keyValueArray KeyValueArray to add parsed values to.
 * @param text text to parse.
 */
export function classStringParser(keyValueArray, text) {
    for (let i = parseClassName(text); i >= 0; i = parseClassNameNext(text, i)) {
        keyValueArraySet(keyValueArray, getLastParsedKey(text), true);
    }
}
/**
 * Common code between `ɵɵclassProp` and `ɵɵstyleProp`.
 *
 * @param prop property name.
 * @param value binding value.
 * @param suffix suffix for the property (e.g. `em` or `px`)
 * @param isClassBased `true` if `class` change (`false` if `style`)
 */
export function checkStylingProperty(prop, value, suffix, isClassBased) {
    const lView = getLView();
    const tView = getTView();
    // Styling instructions use 2 slots per binding.
    // 1. one for the value / TStylingKey
    // 2. one for the intermittent-value / TStylingRange
    const bindingIndex = incrementBindingIndex(2);
    if (tView.firstUpdatePass) {
        stylingFirstUpdatePass(tView, prop, bindingIndex, isClassBased);
    }
    if (value !== NO_CHANGE && bindingUpdated(lView, bindingIndex, value)) {
        const tNode = tView.data[getSelectedIndex()];
        updateStyling(tView, tNode, lView, lView[RENDERER], prop, lView[bindingIndex + 1] = normalizeSuffix(value, suffix), isClassBased, bindingIndex);
    }
}
/**
 * Common code between `ɵɵclassMap` and `ɵɵstyleMap`.
 *
 * @param keyValueArraySet (See `keyValueArraySet` in "util/array_utils") Gets passed in as a
 *        function so that `style` can be processed. This is done for tree shaking purposes.
 * @param stringParser Parser used to parse `value` if `string`. (Passed in as `style` and `class`
 *        have different parsers.)
 * @param value bound value from application
 * @param isClassBased `true` if `class` change (`false` if `style`)
 */
export function checkStylingMap(keyValueArraySet, stringParser, value, isClassBased) {
    const tView = getTView();
    const bindingIndex = incrementBindingIndex(2);
    if (tView.firstUpdatePass) {
        stylingFirstUpdatePass(tView, null, bindingIndex, isClassBased);
    }
    const lView = getLView();
    if (value !== NO_CHANGE && bindingUpdated(lView, bindingIndex, value)) {
        // `getSelectedIndex()` should be here (rather than in instruction) so that it is guarded by the
        // if so as not to read unnecessarily.
        const tNode = tView.data[getSelectedIndex()];
        if (hasStylingInputShadow(tNode, isClassBased) && !isInHostBindings(tView, bindingIndex)) {
            if (ngDevMode) {
                // verify that if we are shadowing then `TData` is appropriately marked so that we skip
                // processing this binding in styling resolution.
                const tStylingKey = tView.data[bindingIndex];
                assertEqual(Array.isArray(tStylingKey) ? tStylingKey[1] : tStylingKey, false, 'Styling linked list shadow input should be marked as \'false\'');
            }
            // VE does not concatenate the static portion like we are doing here.
            // Instead VE just ignores the static completely if dynamic binding is present.
            // Because of locality we have already set the static portion because we don't know if there
            // is a dynamic portion until later. If we would ignore the static portion it would look like
            // the binding has removed it. This would confuse `[ngStyle]`/`[ngClass]` to do the wrong
            // thing as it would think that the static portion was removed. For this reason we
            // concatenate it so that `[ngStyle]`/`[ngClass]`  can continue to work on changed.
            let staticPrefix = isClassBased ? tNode.classesWithoutHost : tNode.stylesWithoutHost;
            ngDevMode && isClassBased === false && staticPrefix !== null &&
                assertEqual(staticPrefix.endsWith(';'), true, 'Expecting static portion to end with \';\'');
            if (staticPrefix !== null) {
                // We want to make sure that falsy values of `value` become empty strings.
                value = concatStringsWithSpace(staticPrefix, value ? value : '');
            }
            // Given `<div [style] my-dir>` such that `my-dir` has `@Input('style')`.
            // This takes over the `[style]` binding. (Same for `[class]`)
            setDirectiveInputsWhichShadowsStyling(tView, tNode, lView, value, isClassBased);
        }
        else {
            updateStylingMap(tView, tNode, lView, lView[RENDERER], lView[bindingIndex + 1], lView[bindingIndex + 1] = toStylingKeyValueArray(keyValueArraySet, stringParser, value), isClassBased, bindingIndex);
        }
    }
}
/**
 * Determines when the binding is in `hostBindings` section
 *
 * @param tView Current `TView`
 * @param bindingIndex index of binding which we would like if it is in `hostBindings`
 */
function isInHostBindings(tView, bindingIndex) {
    // All host bindings are placed after the expando section.
    return bindingIndex >= tView.expandoStartIndex;
}
/**
 * Collects the necessary information to insert the binding into a linked list of style bindings
 * using `insertTStylingBinding`.
 *
 * @param tView `TView` where the binding linked list will be stored.
 * @param tStylingKey Property/key of the binding.
 * @param bindingIndex Index of binding associated with the `prop`
 * @param isClassBased `true` if `class` change (`false` if `style`)
 */
function stylingFirstUpdatePass(tView, tStylingKey, bindingIndex, isClassBased) {
    ngDevMode && assertFirstUpdatePass(tView);
    const tData = tView.data;
    if (tData[bindingIndex + 1] === null) {
        // The above check is necessary because we don't clear first update pass until first successful
        // (no exception) template execution. This prevents the styling instruction from double adding
        // itself to the list.
        // `getSelectedIndex()` should be here (rather than in instruction) so that it is guarded by the
        // if so as not to read unnecessarily.
        const tNode = tData[getSelectedIndex()];
        ngDevMode && assertDefined(tNode, 'TNode expected');
        const isHostBindings = isInHostBindings(tView, bindingIndex);
        if (hasStylingInputShadow(tNode, isClassBased) && tStylingKey === null && !isHostBindings) {
            // `tStylingKey === null` implies that we are either `[style]` or `[class]` binding.
            // If there is a directive which uses `@Input('style')` or `@Input('class')` than
            // we need to neutralize this binding since that directive is shadowing it.
            // We turn this into a noop by setting the key to `false`
            tStylingKey = false;
        }
        tStylingKey = wrapInStaticStylingKey(tData, tNode, tStylingKey, isClassBased);
        insertTStylingBinding(tData, tNode, tStylingKey, bindingIndex, isHostBindings, isClassBased);
    }
}
/**
 * Adds static styling information to the binding if applicable.
 *
 * The linked list of styles not only stores the list and keys, but also stores static styling
 * information on some of the keys. This function determines if the key should contain the styling
 * information and computes it.
 *
 * See `TStylingStatic` for more details.
 *
 * @param tData `TData` where the linked list is stored.
 * @param tNode `TNode` for which the styling is being computed.
 * @param stylingKey `TStylingKeyPrimitive` which may need to be wrapped into `TStylingKey`
 * @param isClassBased `true` if `class` (`false` if `style`)
 */
export function wrapInStaticStylingKey(tData, tNode, stylingKey, isClassBased) {
    const hostDirectiveDef = getCurrentDirectiveDef(tData);
    let residual = isClassBased ? tNode.residualClasses : tNode.residualStyles;
    if (hostDirectiveDef === null) {
        // We are in template node.
        // If template node already had styling instruction then it has already collected the static
        // styling and there is no need to collect them again. We know that we are the first styling
        // instruction because the `TNode.*Bindings` points to 0 (nothing has been inserted yet).
        const isFirstStylingInstructionInTemplate = (isClassBased ? tNode.classBindings : tNode.styleBindings) === 0;
        if (isFirstStylingInstructionInTemplate) {
            // It would be nice to be able to get the statics from `mergeAttrs`, however, at this point
            // they are already merged and it would not be possible to figure which property belongs where
            // in the priority.
            stylingKey = collectStylingFromDirectives(null, tData, tNode, stylingKey, isClassBased);
            stylingKey = collectStylingFromTAttrs(stylingKey, tNode.attrs, isClassBased);
            // We know that if we have styling binding in template we can't have residual.
            residual = null;
        }
    }
    else {
        // We are in host binding node and there was no binding instruction in template node.
        // This means that we need to compute the residual.
        const directiveStylingLast = tNode.directiveStylingLast;
        const isFirstStylingInstructionInHostBinding = directiveStylingLast === -1 || tData[directiveStylingLast] !== hostDirectiveDef;
        if (isFirstStylingInstructionInHostBinding) {
            stylingKey =
                collectStylingFromDirectives(hostDirectiveDef, tData, tNode, stylingKey, isClassBased);
            if (residual === null) {
                // - If `null` than either:
                //    - Template styling instruction already ran and it has consumed the static
                //      styling into its `TStylingKey` and so there is no need to update residual. Instead
                //      we need to update the `TStylingKey` associated with the first template node
                //      instruction. OR
                //    - Some other styling instruction ran and determined that there are no residuals
                let templateStylingKey = getTemplateHeadTStylingKey(tData, tNode, isClassBased);
                if (templateStylingKey !== undefined && Array.isArray(templateStylingKey)) {
                    // Only recompute if `templateStylingKey` had static values. (If no static value found
                    // then there is nothing to do since this operation can only produce less static keys, not
                    // more.)
                    templateStylingKey = collectStylingFromDirectives(null, tData, tNode, templateStylingKey[1] /* unwrap previous statics */, isClassBased);
                    templateStylingKey =
                        collectStylingFromTAttrs(templateStylingKey, tNode.attrs, isClassBased);
                    setTemplateHeadTStylingKey(tData, tNode, isClassBased, templateStylingKey);
                }
            }
            else {
                // We only need to recompute residual if it is not `null`.
                // - If existing residual (implies there was no template styling). This means that some of
                //   the statics may have moved from the residual to the `stylingKey` and so we have to
                //   recompute.
                // - If `undefined` this is the first time we are running.
                residual = collectResidual(tData, tNode, isClassBased);
            }
        }
    }
    if (residual !== undefined) {
        isClassBased ? (tNode.residualClasses = residual) : (tNode.residualStyles = residual);
    }
    return stylingKey;
}
/**
 * Retrieve the `TStylingKey` for the template styling instruction.
 *
 * This is needed since `hostBinding` styling instructions are inserted after the template
 * instruction. While the template instruction needs to update the residual in `TNode` the
 * `hostBinding` instructions need to update the `TStylingKey` of the template instruction because
 * the template instruction is downstream from the `hostBindings` instructions.
 *
 * @param tData `TData` where the linked list is stored.
 * @param tNode `TNode` for which the styling is being computed.
 * @param isClassBased `true` if `class` (`false` if `style`)
 * @return `TStylingKey` if found or `undefined` if not found.
 */
function getTemplateHeadTStylingKey(tData, tNode, isClassBased) {
    const bindings = isClassBased ? tNode.classBindings : tNode.styleBindings;
    if (getTStylingRangeNext(bindings) === 0) {
        // There does not seem to be a styling instruction in the `template`.
        return undefined;
    }
    return tData[getTStylingRangePrev(bindings)];
}
/**
 * Update the `TStylingKey` of the first template instruction in `TNode`.
 *
 * Logically `hostBindings` styling instructions are of lower priority than that of the template.
 * However, they execute after the template styling instructions. This means that they get inserted
 * in front of the template styling instructions.
 *
 * If we have a template styling instruction and a new `hostBindings` styling instruction is
 * executed it means that it may need to steal static fields from the template instruction. This
 * method allows us to update the first template instruction `TStylingKey` with a new value.
 *
 * Assume:
 * ```
 * <div my-dir style="color: red" [style.color]="tmplExp"></div>
 *
 * @Directive({
 *   host: {
 *     'style': 'width: 100px',
 *     '[style.color]': 'dirExp',
 *   }
 * })
 * class MyDir {}
 * ```
 *
 * when `[style.color]="tmplExp"` executes it creates this data structure.
 * ```
 *  ['', 'color', 'color', 'red', 'width', '100px'],
 * ```
 *
 * The reason for this is that the template instruction does not know if there are styling
 * instructions and must assume that there are none and must collect all of the static styling.
 * (both
 * `color' and 'width`)
 *
 * When `'[style.color]': 'dirExp',` executes we need to insert a new data into the linked list.
 * ```
 *  ['', 'color', 'width', '100px'],  // newly inserted
 *  ['', 'color', 'color', 'red', 'width', '100px'], // this is wrong
 * ```
 *
 * Notice that the template statics is now wrong as it incorrectly contains `width` so we need to
 * update it like so:
 * ```
 *  ['', 'color', 'width', '100px'],
 *  ['', 'color', 'color', 'red'],    // UPDATE
 * ```
 *
 * @param tData `TData` where the linked list is stored.
 * @param tNode `TNode` for which the styling is being computed.
 * @param isClassBased `true` if `class` (`false` if `style`)
 * @param tStylingKey New `TStylingKey` which is replacing the old one.
 */
function setTemplateHeadTStylingKey(tData, tNode, isClassBased, tStylingKey) {
    const bindings = isClassBased ? tNode.classBindings : tNode.styleBindings;
    ngDevMode &&
        assertNotEqual(getTStylingRangeNext(bindings), 0, 'Expecting to have at least one template styling binding.');
    tData[getTStylingRangePrev(bindings)] = tStylingKey;
}
/**
 * Collect all static values after the current `TNode.directiveStylingLast` index.
 *
 * Collect the remaining styling information which has not yet been collected by an existing
 * styling instruction.
 *
 * @param tData `TData` where the `DirectiveDefs` are stored.
 * @param tNode `TNode` which contains the directive range.
 * @param isClassBased `true` if `class` (`false` if `style`)
 */
function collectResidual(tData, tNode, isClassBased) {
    let residual = undefined;
    const directiveEnd = tNode.directiveEnd;
    ngDevMode &&
        assertNotEqual(tNode.directiveStylingLast, -1, 'By the time this function gets called at least one hostBindings-node styling instruction must have executed.');
    // We add `1 + tNode.directiveStart` because we need to skip the current directive (as we are
    // collecting things after the last `hostBindings` directive which had a styling instruction.)
    for (let i = 1 + tNode.directiveStylingLast; i < directiveEnd; i++) {
        const attrs = tData[i].hostAttrs;
        residual = collectStylingFromTAttrs(residual, attrs, isClassBased);
    }
    return collectStylingFromTAttrs(residual, tNode.attrs, isClassBased);
}
/**
 * Collect the static styling information with lower priority than `hostDirectiveDef`.
 *
 * (This is opposite of residual styling.)
 *
 * @param hostDirectiveDef `DirectiveDef` for which we want to collect lower priority static
 *        styling. (Or `null` if template styling)
 * @param tData `TData` where the linked list is stored.
 * @param tNode `TNode` for which the styling is being computed.
 * @param stylingKey Existing `TStylingKey` to update or wrap.
 * @param isClassBased `true` if `class` (`false` if `style`)
 */
function collectStylingFromDirectives(hostDirectiveDef, tData, tNode, stylingKey, isClassBased) {
    // We need to loop because there can be directives which have `hostAttrs` but don't have
    // `hostBindings` so this loop catches up to the current directive..
    let currentDirective = null;
    const directiveEnd = tNode.directiveEnd;
    let directiveStylingLast = tNode.directiveStylingLast;
    if (directiveStylingLast === -1) {
        directiveStylingLast = tNode.directiveStart;
    }
    else {
        directiveStylingLast++;
    }
    while (directiveStylingLast < directiveEnd) {
        currentDirective = tData[directiveStylingLast];
        ngDevMode && assertDefined(currentDirective, 'expected to be defined');
        stylingKey = collectStylingFromTAttrs(stylingKey, currentDirective.hostAttrs, isClassBased);
        if (currentDirective === hostDirectiveDef)
            break;
        directiveStylingLast++;
    }
    if (hostDirectiveDef !== null) {
        // we only advance the styling cursor if we are collecting data from host bindings.
        // Template executes before host bindings and so if we would update the index,
        // host bindings would not get their statics.
        tNode.directiveStylingLast = directiveStylingLast;
    }
    return stylingKey;
}
/**
 * Convert `TAttrs` into `TStylingStatic`.
 *
 * @param stylingKey existing `TStylingKey` to update or wrap.
 * @param attrs `TAttributes` to process.
 * @param isClassBased `true` if `class` (`false` if `style`)
 */
function collectStylingFromTAttrs(stylingKey, attrs, isClassBased) {
    const desiredMarker = isClassBased ? 1 /* AttributeMarker.Classes */ : 2 /* AttributeMarker.Styles */;
    let currentMarker = -1 /* AttributeMarker.ImplicitAttributes */;
    if (attrs !== null) {
        for (let i = 0; i < attrs.length; i++) {
            const item = attrs[i];
            if (typeof item === 'number') {
                currentMarker = item;
            }
            else {
                if (currentMarker === desiredMarker) {
                    if (!Array.isArray(stylingKey)) {
                        stylingKey = stylingKey === undefined ? [] : ['', stylingKey];
                    }
                    keyValueArraySet(stylingKey, item, isClassBased ? true : attrs[++i]);
                }
            }
        }
    }
    return stylingKey === undefined ? null : stylingKey;
}
/**
 * Convert user input to `KeyValueArray`.
 *
 * This function takes user input which could be `string`, Object literal, or iterable and converts
 * it into a consistent representation. The output of this is `KeyValueArray` (which is an array
 * where
 * even indexes contain keys and odd indexes contain values for those keys).
 *
 * The advantage of converting to `KeyValueArray` is that we can perform diff in an input
 * independent
 * way.
 * (ie we can compare `foo bar` to `['bar', 'baz'] and determine a set of changes which need to be
 * applied)
 *
 * The fact that `KeyValueArray` is sorted is very important because it allows us to compute the
 * difference in linear fashion without the need to allocate any additional data.
 *
 * For example if we kept this as a `Map` we would have to iterate over previous `Map` to determine
 * which values need to be deleted, over the new `Map` to determine additions, and we would have to
 * keep additional `Map` to keep track of duplicates or items which have not yet been visited.
 *
 * @param keyValueArraySet (See `keyValueArraySet` in "util/array_utils") Gets passed in as a
 *        function so that `style` can be processed. This is done
 *        for tree shaking purposes.
 * @param stringParser The parser is passed in so that it will be tree shakable. See
 *        `styleStringParser` and `classStringParser`
 * @param value The value to parse/convert to `KeyValueArray`
 */
export function toStylingKeyValueArray(keyValueArraySet, stringParser, value) {
    if (value == null /*|| value === undefined */ || value === '')
        return EMPTY_ARRAY;
    const styleKeyValueArray = [];
    const unwrappedValue = unwrapSafeValue(value);
    if (Array.isArray(unwrappedValue)) {
        for (let i = 0; i < unwrappedValue.length; i++) {
            keyValueArraySet(styleKeyValueArray, unwrappedValue[i], true);
        }
    }
    else if (typeof unwrappedValue === 'object') {
        for (const key in unwrappedValue) {
            if (unwrappedValue.hasOwnProperty(key)) {
                keyValueArraySet(styleKeyValueArray, key, unwrappedValue[key]);
            }
        }
    }
    else if (typeof unwrappedValue === 'string') {
        stringParser(styleKeyValueArray, unwrappedValue);
    }
    else {
        ngDevMode &&
            throwError('Unsupported styling type ' + typeof unwrappedValue + ': ' + unwrappedValue);
    }
    return styleKeyValueArray;
}
/**
 * Set a `value` for a `key`.
 *
 * See: `keyValueArraySet` for details
 *
 * @param keyValueArray KeyValueArray to add to.
 * @param key Style key to add.
 * @param value The value to set.
 */
export function styleKeyValueArraySet(keyValueArray, key, value) {
    keyValueArraySet(keyValueArray, key, unwrapSafeValue(value));
}
/**
 * Update map based styling.
 *
 * Map based styling could be anything which contains more than one binding. For example `string`,
 * or object literal. Dealing with all of these types would complicate the logic so
 * instead this function expects that the complex input is first converted into normalized
 * `KeyValueArray`. The advantage of normalization is that we get the values sorted, which makes it
 * very cheap to compute deltas between the previous and current value.
 *
 * @param tView Associated `TView.data` contains the linked list of binding priorities.
 * @param tNode `TNode` where the binding is located.
 * @param lView `LView` contains the values associated with other styling binding at this `TNode`.
 * @param renderer Renderer to use if any updates.
 * @param oldKeyValueArray Previous value represented as `KeyValueArray`
 * @param newKeyValueArray Current value represented as `KeyValueArray`
 * @param isClassBased `true` if `class` (`false` if `style`)
 * @param bindingIndex Binding index of the binding.
 */
function updateStylingMap(tView, tNode, lView, renderer, oldKeyValueArray, newKeyValueArray, isClassBased, bindingIndex) {
    if (oldKeyValueArray === NO_CHANGE) {
        // On first execution the oldKeyValueArray is NO_CHANGE => treat it as empty KeyValueArray.
        oldKeyValueArray = EMPTY_ARRAY;
    }
    let oldIndex = 0;
    let newIndex = 0;
    let oldKey = 0 < oldKeyValueArray.length ? oldKeyValueArray[0] : null;
    let newKey = 0 < newKeyValueArray.length ? newKeyValueArray[0] : null;
    while (oldKey !== null || newKey !== null) {
        ngDevMode && assertLessThan(oldIndex, 999, 'Are we stuck in infinite loop?');
        ngDevMode && assertLessThan(newIndex, 999, 'Are we stuck in infinite loop?');
        const oldValue = oldIndex < oldKeyValueArray.length ? oldKeyValueArray[oldIndex + 1] : undefined;
        const newValue = newIndex < newKeyValueArray.length ? newKeyValueArray[newIndex + 1] : undefined;
        let setKey = null;
        let setValue = undefined;
        if (oldKey === newKey) {
            // UPDATE: Keys are equal => new value is overwriting old value.
            oldIndex += 2;
            newIndex += 2;
            if (oldValue !== newValue) {
                setKey = newKey;
                setValue = newValue;
            }
        }
        else if (newKey === null || oldKey !== null && oldKey < newKey) {
            // DELETE: oldKey key is missing or we did not find the oldKey in the newValue
            // (because the keyValueArray is sorted and `newKey` is found later alphabetically).
            // `"background" < "color"` so we need to delete `"background"` because it is not found in the
            // new array.
            oldIndex += 2;
            setKey = oldKey;
        }
        else {
            // CREATE: newKey's is earlier alphabetically than oldKey's (or no oldKey) => we have new key.
            // `"color" > "background"` so we need to add `color` because it is in new array but not in
            // old array.
            ngDevMode && assertDefined(newKey, 'Expecting to have a valid key');
            newIndex += 2;
            setKey = newKey;
            setValue = newValue;
        }
        if (setKey !== null) {
            updateStyling(tView, tNode, lView, renderer, setKey, setValue, isClassBased, bindingIndex);
        }
        oldKey = oldIndex < oldKeyValueArray.length ? oldKeyValueArray[oldIndex] : null;
        newKey = newIndex < newKeyValueArray.length ? newKeyValueArray[newIndex] : null;
    }
}
/**
 * Update a simple (property name) styling.
 *
 * This function takes `prop` and updates the DOM to that value. The function takes the binding
 * value as well as binding priority into consideration to determine which value should be written
 * to DOM. (For example it may be determined that there is a higher priority overwrite which blocks
 * the DOM write, or if the value goes to `undefined` a lower priority overwrite may be consulted.)
 *
 * @param tView Associated `TView.data` contains the linked list of binding priorities.
 * @param tNode `TNode` where the binding is located.
 * @param lView `LView` contains the values associated with other styling binding at this `TNode`.
 * @param renderer Renderer to use if any updates.
 * @param prop Either style property name or a class name.
 * @param value Either style value for `prop` or `true`/`false` if `prop` is class.
 * @param isClassBased `true` if `class` (`false` if `style`)
 * @param bindingIndex Binding index of the binding.
 */
function updateStyling(tView, tNode, lView, renderer, prop, value, isClassBased, bindingIndex) {
    if (!(tNode.type & 3 /* TNodeType.AnyRNode */)) {
        // It is possible to have styling on non-elements (such as ng-container).
        // This is rare, but it does happen. In such a case, just ignore the binding.
        return;
    }
    const tData = tView.data;
    const tRange = tData[bindingIndex + 1];
    const higherPriorityValue = getTStylingRangeNextDuplicate(tRange) ?
        findStylingValue(tData, tNode, lView, prop, getTStylingRangeNext(tRange), isClassBased) :
        undefined;
    if (!isStylingValuePresent(higherPriorityValue)) {
        // We don't have a next duplicate, or we did not find a duplicate value.
        if (!isStylingValuePresent(value)) {
            // We should delete current value or restore to lower priority value.
            if (getTStylingRangePrevDuplicate(tRange)) {
                // We have a possible prev duplicate, let's retrieve it.
                value = findStylingValue(tData, null, lView, prop, bindingIndex, isClassBased);
            }
        }
        const rNode = getNativeByIndex(getSelectedIndex(), lView);
        applyStyling(renderer, isClassBased, rNode, prop, value);
    }
}
/**
 * Search for styling value with higher priority which is overwriting current value, or a
 * value of lower priority to which we should fall back if the value is `undefined`.
 *
 * When value is being applied at a location, related values need to be consulted.
 * - If there is a higher priority binding, we should be using that one instead.
 *   For example `<div  [style]="{color:exp1}" [style.color]="exp2">` change to `exp1`
 *   requires that we check `exp2` to see if it is set to value other than `undefined`.
 * - If there is a lower priority binding and we are changing to `undefined`
 *   For example `<div  [style]="{color:exp1}" [style.color]="exp2">` change to `exp2` to
 *   `undefined` requires that we check `exp1` (and static values) and use that as new value.
 *
 * NOTE: The styling stores two values.
 * 1. The raw value which came from the application is stored at `index + 0` location. (This value
 *    is used for dirty checking).
 * 2. The normalized value is stored at `index + 1`.
 *
 * @param tData `TData` used for traversing the priority.
 * @param tNode `TNode` to use for resolving static styling. Also controls search direction.
 *   - `TNode` search next and quit as soon as `isStylingValuePresent(value)` is true.
 *      If no value found consult `tNode.residualStyle`/`tNode.residualClass` for default value.
 *   - `null` search prev and go all the way to end. Return last value where
 *     `isStylingValuePresent(value)` is true.
 * @param lView `LView` used for retrieving the actual values.
 * @param prop Property which we are interested in.
 * @param index Starting index in the linked list of styling bindings where the search should start.
 * @param isClassBased `true` if `class` (`false` if `style`)
 */
function findStylingValue(tData, tNode, lView, prop, index, isClassBased) {
    // `TNode` to use for resolving static styling. Also controls search direction.
    //   - `TNode` search next and quit as soon as `isStylingValuePresent(value)` is true.
    //      If no value found consult `tNode.residualStyle`/`tNode.residualClass` for default value.
    //   - `null` search prev and go all the way to end. Return last value where
    //     `isStylingValuePresent(value)` is true.
    const isPrevDirection = tNode === null;
    let value = undefined;
    while (index > 0) {
        const rawKey = tData[index];
        const containsStatics = Array.isArray(rawKey);
        // Unwrap the key if we contain static values.
        const key = containsStatics ? rawKey[1] : rawKey;
        const isStylingMap = key === null;
        let valueAtLViewIndex = lView[index + 1];
        if (valueAtLViewIndex === NO_CHANGE) {
            // In firstUpdatePass the styling instructions create a linked list of styling.
            // On subsequent passes it is possible for a styling instruction to try to read a binding
            // which
            // has not yet executed. In that case we will find `NO_CHANGE` and we should assume that
            // we have `undefined` (or empty array in case of styling-map instruction) instead. This
            // allows the resolution to apply the value (which may later be overwritten when the
            // binding actually executes.)
            valueAtLViewIndex = isStylingMap ? EMPTY_ARRAY : undefined;
        }
        let currentValue = isStylingMap ? keyValueArrayGet(valueAtLViewIndex, prop) :
            (key === prop ? valueAtLViewIndex : undefined);
        if (containsStatics && !isStylingValuePresent(currentValue)) {
            currentValue = keyValueArrayGet(rawKey, prop);
        }
        if (isStylingValuePresent(currentValue)) {
            value = currentValue;
            if (isPrevDirection) {
                return value;
            }
        }
        const tRange = tData[index + 1];
        index = isPrevDirection ? getTStylingRangePrev(tRange) : getTStylingRangeNext(tRange);
    }
    if (tNode !== null) {
        // in case where we are going in next direction AND we did not find anything, we need to
        // consult residual styling
        let residual = isClassBased ? tNode.residualClasses : tNode.residualStyles;
        if (residual != null /** OR residual !=== undefined */) {
            value = keyValueArrayGet(residual, prop);
        }
    }
    return value;
}
/**
 * Determines if the binding value should be used (or if the value is 'undefined' and hence priority
 * resolution should be used.)
 *
 * @param value Binding style value.
 */
function isStylingValuePresent(value) {
    // Currently only `undefined` value is considered non-binding. That is `undefined` says I don't
    // have an opinion as to what this binding should be and you should consult other bindings by
    // priority to determine the valid value.
    // This is extracted into a single function so that we have a single place to control this.
    return value !== undefined;
}
/**
 * Normalizes and/or adds a suffix to the value.
 *
 * If value is `null`/`undefined` no suffix is added
 * @param value
 * @param suffix
 */
function normalizeSuffix(value, suffix) {
    if (value == null /** || value === undefined */) {
        // do nothing
    }
    else if (typeof suffix === 'string') {
        value = value + suffix;
    }
    else if (typeof value === 'object') {
        value = stringify(unwrapSafeValue(value));
    }
    return value;
}
/**
 * Tests if the `TNode` has input shadow.
 *
 * An input shadow is when a directive steals (shadows) the input by using `@Input('style')` or
 * `@Input('class')` as input.
 *
 * @param tNode `TNode` which we would like to see if it has shadow.
 * @param isClassBased `true` if `class` (`false` if `style`)
 */
export function hasStylingInputShadow(tNode, isClassBased) {
    return (tNode.flags & (isClassBased ? 16 /* TNodeFlags.hasClassInput */ : 32 /* TNodeFlags.hasStyleInput */)) !== 0;
}
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`styleMap` or any static styles that are\n * present from when the element was created with `styling`).\n *\n * Note that the styling element is updated as part of `stylingApply`.\n *\n * @param prop A valid CSS property.\n * @param value New value to write (`null` or an empty string to remove).\n * @param suffix Optional suffix. 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If we would ignore the static portion it would look like\n      // the binding has removed it. This would confuse `[ngStyle]`/`[ngClass]` to do the wrong\n      // thing as it would think that the static portion was removed. For this reason we\n      // concatenate it so that `[ngStyle]`/`[ngClass]`  can continue to work on changed.\n      let staticPrefix = isClassBased ? tNode.classesWithoutHost : tNode.stylesWithoutHost;\n      ngDevMode && isClassBased === false && staticPrefix !== null &&\n          assertEqual(\n              staticPrefix.endsWith(';'), true, 'Expecting static portion to end with \\';\\'');\n      if (staticPrefix !== null) {\n        // We want to make sure that falsy values of `value` become empty strings.\n        value = concatStringsWithSpace(staticPrefix, value ? value : '');\n      }\n      // Given `<div [style] my-dir>` such that `my-dir` has `@Input('style')`.\n      // This takes over the `[style]` binding. (Same for `[class]`)\n      setDirectiveInputsWhichShadowsStyling(tView, tNode, lView, value, isClassBased);\n    } else {\n      updateStylingMap(\n          tView, tNode, lView, lView[RENDERER], lView[bindingIndex + 1],\n          lView[bindingIndex + 1] = toStylingKeyValueArray(keyValueArraySet, stringParser, value),\n          isClassBased, bindingIndex);\n    }\n  }\n}\n\n/**\n * Determines when the binding is in `hostBindings` section\n *\n * @param tView Current `TView`\n * @param bindingIndex index of binding which we would like if it is in `hostBindings`\n */\nfunction isInHostBindings(tView: TView, bindingIndex: number): boolean {\n  // All host bindings are placed after the expando section.\n  return bindingIndex >= tView.expandoStartIndex;\n}\n\n/**\n * Collects the necessary information to insert the binding into a linked list of style bindings\n * using `insertTStylingBinding`.\n *\n * @param tView `TView` where the binding linked list will be stored.\n * @param tStylingKey Property/key of the binding.\n * @param bindingIndex Index of binding associated with the `prop`\n * @param isClassBased `true` if `class` change (`false` if `style`)\n */\nfunction stylingFirstUpdatePass(\n    tView: TView, tStylingKey: TStylingKey, bindingIndex: number, isClassBased: boolean): void {\n  ngDevMode && assertFirstUpdatePass(tView);\n  const tData = tView.data;\n  if (tData[bindingIndex + 1] === null) {\n    // The above check is necessary because we don't clear first update pass until first successful\n    // (no exception) template execution. This prevents the styling instruction from double adding\n    // itself to the list.\n    // `getSelectedIndex()` should be here (rather than in instruction) so that it is guarded by the\n    // if so as not to read unnecessarily.\n    const tNode = tData[getSelectedIndex()] as TNode;\n    ngDevMode && assertDefined(tNode, 'TNode expected');\n    const isHostBindings = isInHostBindings(tView, bindingIndex);\n    if (hasStylingInputShadow(tNode, isClassBased) && tStylingKey === null && !isHostBindings) {\n      // `tStylingKey === null` implies that we are either `[style]` or `[class]` binding.\n      // If there is a directive which uses `@Input('style')` or `@Input('class')` than\n      // we need to neutralize this binding since that directive is shadowing it.\n      // We turn this into a noop by setting the key to `false`\n      tStylingKey = false;\n    }\n    tStylingKey = wrapInStaticStylingKey(tData, tNode, tStylingKey, isClassBased);\n    insertTStylingBinding(tData, tNode, tStylingKey, bindingIndex, isHostBindings, isClassBased);\n  }\n}\n\n/**\n * Adds static styling information to the binding if applicable.\n *\n * The linked list of styles not only stores the list and keys, but also stores static styling\n * information on some of the keys. This function determines if the key should contain the styling\n * information and computes it.\n *\n * See `TStylingStatic` for more details.\n *\n * @param tData `TData` where the linked list is stored.\n * @param tNode `TNode` for which the styling is being computed.\n * @param stylingKey `TStylingKeyPrimitive` which may need to be wrapped into `TStylingKey`\n * @param isClassBased `true` if `class` (`false` if `style`)\n */\nexport function wrapInStaticStylingKey(\n    tData: TData, tNode: TNode, stylingKey: TStylingKey, isClassBased: boolean): TStylingKey {\n  const hostDirectiveDef = getCurrentDirectiveDef(tData);\n  let residual = isClassBased ? tNode.residualClasses : tNode.residualStyles;\n  if (hostDirectiveDef === null) {\n    // We are in template node.\n    // If template node already had styling instruction then it has already collected the static\n    // styling and there is no need to collect them again. We know that we are the first styling\n    // instruction because the `TNode.*Bindings` points to 0 (nothing has been inserted yet).\n    const isFirstStylingInstructionInTemplate =\n        (isClassBased ? tNode.classBindings : tNode.styleBindings) as any as number === 0;\n    if (isFirstStylingInstructionInTemplate) {\n      // It would be nice to be able to get the statics from `mergeAttrs`, however, at this point\n      // they are already merged and it would not be possible to figure which property belongs where\n      // in the priority.\n      stylingKey = collectStylingFromDirectives(null, tData, tNode, stylingKey, isClassBased);\n      stylingKey = collectStylingFromTAttrs(stylingKey, tNode.attrs, isClassBased);\n      // We know that if we have styling binding in template we can't have residual.\n      residual = null;\n    }\n  } else {\n    // We are in host binding node and there was no binding instruction in template node.\n    // This means that we need to compute the residual.\n    const directiveStylingLast = tNode.directiveStylingLast;\n    const isFirstStylingInstructionInHostBinding =\n        directiveStylingLast === -1 || tData[directiveStylingLast] !== hostDirectiveDef;\n    if (isFirstStylingInstructionInHostBinding) {\n      stylingKey =\n          collectStylingFromDirectives(hostDirectiveDef, tData, tNode, stylingKey, isClassBased);\n      if (residual === null) {\n        // - If `null` than either:\n        //    - Template styling instruction already ran and it has consumed the static\n        //      styling into its `TStylingKey` and so there is no need to update residual. Instead\n        //      we need to update the `TStylingKey` associated with the first template node\n        //      instruction. OR\n        //    - Some other styling instruction ran and determined that there are no residuals\n        let templateStylingKey = getTemplateHeadTStylingKey(tData, tNode, isClassBased);\n        if (templateStylingKey !== undefined && Array.isArray(templateStylingKey)) {\n          // Only recompute if `templateStylingKey` had static values. (If no static value found\n          // then there is nothing to do since this operation can only produce less static keys, not\n          // more.)\n          templateStylingKey = collectStylingFromDirectives(\n              null, tData, tNode, templateStylingKey[1] /* unwrap previous statics */,\n              isClassBased);\n          templateStylingKey =\n              collectStylingFromTAttrs(templateStylingKey, tNode.attrs, isClassBased);\n          setTemplateHeadTStylingKey(tData, tNode, isClassBased, templateStylingKey);\n        }\n      } else {\n        // We only need to recompute residual if it is not `null`.\n        // - If existing residual (implies there was no template styling). This means that some of\n        //   the statics may have moved from the residual to the `stylingKey` and so we have to\n        //   recompute.\n        // - If `undefined` this is the first time we are running.\n        residual = collectResidual(tData, tNode, isClassBased);\n      }\n    }\n  }\n  if (residual !== undefined) {\n    isClassBased ? (tNode.residualClasses = residual) : (tNode.residualStyles = residual);\n  }\n  return stylingKey;\n}\n\n/**\n * Retrieve the `TStylingKey` for the template styling instruction.\n *\n * This is needed since `hostBinding` styling instructions are inserted after the template\n * instruction. While the template instruction needs to update the residual in `TNode` the\n * `hostBinding` instructions need to update the `TStylingKey` of the template instruction because\n * the template instruction is downstream from the `hostBindings` instructions.\n *\n * @param tData `TData` where the linked list is stored.\n * @param tNode `TNode` for which the styling is being computed.\n * @param isClassBased `true` if `class` (`false` if `style`)\n * @return `TStylingKey` if found or `undefined` if not found.\n */\nfunction getTemplateHeadTStylingKey(tData: TData, tNode: TNode, isClassBased: boolean): TStylingKey|\n    undefined {\n  const bindings = isClassBased ? tNode.classBindings : tNode.styleBindings;\n  if (getTStylingRangeNext(bindings) === 0) {\n    // There does not seem to be a styling instruction in the `template`.\n    return undefined;\n  }\n  return tData[getTStylingRangePrev(bindings)] as TStylingKey;\n}\n\n/**\n * Update the `TStylingKey` of the first template instruction in `TNode`.\n *\n * Logically `hostBindings` styling instructions are of lower priority than that of the template.\n * However, they execute after the template styling instructions. This means that they get inserted\n * in front of the template styling instructions.\n *\n * If we have a template styling instruction and a new `hostBindings` styling instruction is\n * executed it means that it may need to steal static fields from the template instruction. This\n * method allows us to update the first template instruction `TStylingKey` with a new value.\n *\n * Assume:\n * ```\n * <div my-dir style=\"color: red\" [style.color]=\"tmplExp\"></div>\n *\n * @Directive({\n *   host: {\n *     'style': 'width: 100px',\n *     '[style.color]': 'dirExp',\n *   }\n * })\n * class MyDir {}\n * ```\n *\n * when `[style.color]=\"tmplExp\"` executes it creates this data structure.\n * ```\n *  ['', 'color', 'color', 'red', 'width', '100px'],\n * ```\n *\n * The reason for this is that the template instruction does not know if there are styling\n * instructions and must assume that there are none and must collect all of the static styling.\n * (both\n * `color' and 'width`)\n *\n * When `'[style.color]': 'dirExp',` executes we need to insert a new data into the linked list.\n * ```\n *  ['', 'color', 'width', '100px'],  // newly inserted\n *  ['', 'color', 'color', 'red', 'width', '100px'], // this is wrong\n * ```\n *\n * Notice that the template statics is now wrong as it incorrectly contains `width` so we need to\n * update it like so:\n * ```\n *  ['', 'color', 'width', '100px'],\n *  ['', 'color', 'color', 'red'],    // UPDATE\n * ```\n *\n * @param tData `TData` where the linked list is stored.\n * @param tNode `TNode` for which the styling is being computed.\n * @param isClassBased `true` if `class` (`false` if `style`)\n * @param tStylingKey New `TStylingKey` which is replacing the old one.\n */\nfunction setTemplateHeadTStylingKey(\n    tData: TData, tNode: TNode, isClassBased: boolean, tStylingKey: TStylingKey): void {\n  const bindings = isClassBased ? tNode.classBindings : tNode.styleBindings;\n  ngDevMode &&\n      assertNotEqual(\n          getTStylingRangeNext(bindings), 0,\n          'Expecting to have at least one template styling binding.');\n  tData[getTStylingRangePrev(bindings)] = tStylingKey;\n}\n\n/**\n * Collect all static values after the current `TNode.directiveStylingLast` index.\n *\n * Collect the remaining styling information which has not yet been collected by an existing\n * styling instruction.\n *\n * @param tData `TData` where the `DirectiveDefs` are stored.\n * @param tNode `TNode` which contains the directive range.\n * @param isClassBased `true` if `class` (`false` if `style`)\n */\nfunction collectResidual(tData: TData, tNode: TNode, isClassBased: boolean): KeyValueArray<any>|\n    null {\n  let residual: KeyValueArray<any>|null|undefined = undefined;\n  const directiveEnd = tNode.directiveEnd;\n  ngDevMode &&\n      assertNotEqual(\n          tNode.directiveStylingLast, -1,\n          'By the time this function gets called at least one hostBindings-node styling instruction must have executed.');\n  // We add `1 + tNode.directiveStart` because we need to skip the current directive (as we are\n  // collecting things after the last `hostBindings` directive which had a styling instruction.)\n  for (let i = 1 + tNode.directiveStylingLast; i < directiveEnd; i++) {\n    const attrs = (tData[i] as DirectiveDef<any>).hostAttrs;\n    residual = collectStylingFromTAttrs(residual, attrs, isClassBased) as KeyValueArray<any>| null;\n  }\n  return collectStylingFromTAttrs(residual, tNode.attrs, isClassBased) as KeyValueArray<any>| null;\n}\n\n/**\n * Collect the static styling information with lower priority than `hostDirectiveDef`.\n *\n * (This is opposite of residual styling.)\n *\n * @param hostDirectiveDef `DirectiveDef` for which we want to collect lower priority static\n *        styling. (Or `null` if template styling)\n * @param tData `TData` where the linked list is stored.\n * @param tNode `TNode` for which the styling is being computed.\n * @param stylingKey Existing `TStylingKey` to update or wrap.\n * @param isClassBased `true` if `class` (`false` if `style`)\n */\nfunction collectStylingFromDirectives(\n    hostDirectiveDef: DirectiveDef<any>|null, tData: TData, tNode: TNode, stylingKey: TStylingKey,\n    isClassBased: boolean): TStylingKey {\n  // We need to loop because there can be directives which have `hostAttrs` but don't have\n  // `hostBindings` so this loop catches up to the current directive..\n  let currentDirective: DirectiveDef<any>|null = null;\n  const directiveEnd = tNode.directiveEnd;\n  let directiveStylingLast = tNode.directiveStylingLast;\n  if (directiveStylingLast === -1) {\n    directiveStylingLast = tNode.directiveStart;\n  } else {\n    directiveStylingLast++;\n  }\n  while (directiveStylingLast < directiveEnd) {\n    currentDirective = tData[directiveStylingLast] as DirectiveDef<any>;\n    ngDevMode && assertDefined(currentDirective, 'expected to be defined');\n    stylingKey = collectStylingFromTAttrs(stylingKey, currentDirective.hostAttrs, isClassBased);\n    if (currentDirective === hostDirectiveDef) break;\n    directiveStylingLast++;\n  }\n  if (hostDirectiveDef !== null) {\n    // we only advance the styling cursor if we are collecting data from host bindings.\n    // Template executes before host bindings and so if we would update the index,\n    // host bindings would not get their statics.\n    tNode.directiveStylingLast = directiveStylingLast;\n  }\n  return stylingKey;\n}\n\n/**\n * Convert `TAttrs` into `TStylingStatic`.\n *\n * @param stylingKey existing `TStylingKey` to update or wrap.\n * @param attrs `TAttributes` to process.\n * @param isClassBased `true` if `class` (`false` if `style`)\n */\nfunction collectStylingFromTAttrs(\n    stylingKey: TStylingKey|undefined, attrs: TAttributes|null,\n    isClassBased: boolean): TStylingKey {\n  const desiredMarker = isClassBased ? AttributeMarker.Classes : AttributeMarker.Styles;\n  let currentMarker = AttributeMarker.ImplicitAttributes;\n  if (attrs !== null) {\n    for (let i = 0; i < attrs.length; i++) {\n      const item = attrs[i] as number | string;\n      if (typeof item === 'number') {\n        currentMarker = item;\n      } else {\n        if (currentMarker === desiredMarker) {\n          if (!Array.isArray(stylingKey)) {\n            stylingKey = stylingKey === undefined ? [] : ['', stylingKey] as any;\n          }\n          keyValueArraySet(\n              stylingKey as KeyValueArray<any>, item, isClassBased ? true : attrs[++i]);\n        }\n      }\n    }\n  }\n  return stylingKey === undefined ? null : stylingKey;\n}\n\n/**\n * Convert user input to `KeyValueArray`.\n *\n * This function takes user input which could be `string`, Object literal, or iterable and converts\n * it into a consistent representation. The output of this is `KeyValueArray` (which is an array\n * where\n * even indexes contain keys and odd indexes contain values for those keys).\n *\n * The advantage of converting to `KeyValueArray` is that we can perform diff in an input\n * independent\n * way.\n * (ie we can compare `foo bar` to `['bar', 'baz'] and determine a set of changes which need to be\n * applied)\n *\n * The fact that `KeyValueArray` is sorted is very important because it allows us to compute the\n * difference in linear fashion without the need to allocate any additional data.\n *\n * For example if we kept this as a `Map` we would have to iterate over previous `Map` to determine\n * which values need to be deleted, over the new `Map` to determine additions, and we would have to\n * keep additional `Map` to keep track of duplicates or items which have not yet been visited.\n *\n * @param keyValueArraySet (See `keyValueArraySet` in \"util/array_utils\") Gets passed in as a\n *        function so that `style` can be processed. This is done\n *        for tree shaking purposes.\n * @param stringParser The parser is passed in so that it will be tree shakable. See\n *        `styleStringParser` and `classStringParser`\n * @param value The value to parse/convert to `KeyValueArray`\n */\nexport function toStylingKeyValueArray(\n    keyValueArraySet: (keyValueArray: KeyValueArray<any>, key: string, value: any) => void,\n    stringParser: (styleKeyValueArray: KeyValueArray<any>, text: string) => void,\n    value: string|string[]|{[key: string]: any}|SafeValue|null|undefined): KeyValueArray<any> {\n  if (value == null /*|| value === undefined */ || value === '') return EMPTY_ARRAY as any;\n  const styleKeyValueArray: KeyValueArray<any> = [] as any;\n  const unwrappedValue = unwrapSafeValue(value) as string | string[] | {[key: string]: any};\n  if (Array.isArray(unwrappedValue)) {\n    for (let i = 0; i < unwrappedValue.length; i++) {\n      keyValueArraySet(styleKeyValueArray, unwrappedValue[i], true);\n    }\n  } else if (typeof unwrappedValue === 'object') {\n    for (const key in unwrappedValue) {\n      if (unwrappedValue.hasOwnProperty(key)) {\n        keyValueArraySet(styleKeyValueArray, key, unwrappedValue[key]);\n      }\n    }\n  } else if (typeof unwrappedValue === 'string') {\n    stringParser(styleKeyValueArray, unwrappedValue);\n  } else {\n    ngDevMode &&\n        throwError('Unsupported styling type ' + typeof unwrappedValue + ': ' + unwrappedValue);\n  }\n  return styleKeyValueArray;\n}\n\n/**\n * Set a `value` for a `key`.\n *\n * See: `keyValueArraySet` for details\n *\n * @param keyValueArray KeyValueArray to add to.\n * @param key Style key to add.\n * @param value The value to set.\n */\nexport function styleKeyValueArraySet(keyValueArray: KeyValueArray<any>, key: string, value: any) {\n  keyValueArraySet(keyValueArray, key, unwrapSafeValue(value));\n}\n\n/**\n * Update map based styling.\n *\n * Map based styling could be anything which contains more than one binding. For example `string`,\n * or object literal. Dealing with all of these types would complicate the logic so\n * instead this function expects that the complex input is first converted into normalized\n * `KeyValueArray`. The advantage of normalization is that we get the values sorted, which makes it\n * very cheap to compute deltas between the previous and current value.\n *\n * @param tView Associated `TView.data` contains the linked list of binding priorities.\n * @param tNode `TNode` where the binding is located.\n * @param lView `LView` contains the values associated with other styling binding at this `TNode`.\n * @param renderer Renderer to use if any updates.\n * @param oldKeyValueArray Previous value represented as `KeyValueArray`\n * @param newKeyValueArray Current value represented as `KeyValueArray`\n * @param isClassBased `true` if `class` (`false` if `style`)\n * @param bindingIndex Binding index of the binding.\n */\nfunction updateStylingMap(\n    tView: TView, tNode: TNode, lView: LView, renderer: Renderer,\n    oldKeyValueArray: KeyValueArray<any>, newKeyValueArray: KeyValueArray<any>,\n    isClassBased: boolean, bindingIndex: number) {\n  if (oldKeyValueArray as KeyValueArray<any>| NO_CHANGE === NO_CHANGE) {\n    // On first execution the oldKeyValueArray is NO_CHANGE => treat it as empty KeyValueArray.\n    oldKeyValueArray = EMPTY_ARRAY as any;\n  }\n  let oldIndex = 0;\n  let newIndex = 0;\n  let oldKey: string|null = 0 < oldKeyValueArray.length ? oldKeyValueArray[0] : null;\n  let newKey: string|null = 0 < newKeyValueArray.length ? newKeyValueArray[0] : null;\n  while (oldKey !== null || newKey !== null) {\n    ngDevMode && assertLessThan(oldIndex, 999, 'Are we stuck in infinite loop?');\n    ngDevMode && assertLessThan(newIndex, 999, 'Are we stuck in infinite loop?');\n    const oldValue =\n        oldIndex < oldKeyValueArray.length ? oldKeyValueArray[oldIndex + 1] : undefined;\n    const newValue =\n        newIndex < newKeyValueArray.length ? newKeyValueArray[newIndex + 1] : undefined;\n    let setKey: string|null = null;\n    let setValue: any = undefined;\n    if (oldKey === newKey) {\n      // UPDATE: Keys are equal => new value is overwriting old value.\n      oldIndex += 2;\n      newIndex += 2;\n      if (oldValue !== newValue) {\n        setKey = newKey;\n        setValue = newValue;\n      }\n    } else if (newKey === null || oldKey !== null && oldKey < newKey!) {\n      // DELETE: oldKey key is missing or we did not find the oldKey in the newValue\n      // (because the keyValueArray is sorted and `newKey` is found later alphabetically).\n      // `\"background\" < \"color\"` so we need to delete `\"background\"` because it is not found in the\n      // new array.\n      oldIndex += 2;\n      setKey = oldKey;\n    } else {\n      // CREATE: newKey's is earlier alphabetically than oldKey's (or no oldKey) => we have new key.\n      // `\"color\" > \"background\"` so we need to add `color` because it is in new array but not in\n      // old array.\n      ngDevMode && assertDefined(newKey, 'Expecting to have a valid key');\n      newIndex += 2;\n      setKey = newKey;\n      setValue = newValue;\n    }\n    if (setKey !== null) {\n      updateStyling(tView, tNode, lView, renderer, setKey, setValue, isClassBased, bindingIndex);\n    }\n    oldKey = oldIndex < oldKeyValueArray.length ? oldKeyValueArray[oldIndex] : null;\n    newKey = newIndex < newKeyValueArray.length ? newKeyValueArray[newIndex] : null;\n  }\n}\n\n/**\n * Update a simple (property name) styling.\n *\n * This function takes `prop` and updates the DOM to that value. The function takes the binding\n * value as well as binding priority into consideration to determine which value should be written\n * to DOM. (For example it may be determined that there is a higher priority overwrite which blocks\n * the DOM write, or if the value goes to `undefined` a lower priority overwrite may be consulted.)\n *\n * @param tView Associated `TView.data` contains the linked list of binding priorities.\n * @param tNode `TNode` where the binding is located.\n * @param lView `LView` contains the values associated with other styling binding at this `TNode`.\n * @param renderer Renderer to use if any updates.\n * @param prop Either style property name or a class name.\n * @param value Either style value for `prop` or `true`/`false` if `prop` is class.\n * @param isClassBased `true` if `class` (`false` if `style`)\n * @param bindingIndex Binding index of the binding.\n */\nfunction updateStyling(\n    tView: TView, tNode: TNode, lView: LView, renderer: Renderer, prop: string,\n    value: string|undefined|null|boolean, isClassBased: boolean, bindingIndex: number) {\n  if (!(tNode.type & TNodeType.AnyRNode)) {\n    // It is possible to have styling on non-elements (such as ng-container).\n    // This is rare, but it does happen. In such a case, just ignore the binding.\n    return;\n  }\n  const tData = tView.data;\n  const tRange = tData[bindingIndex + 1] as TStylingRange;\n  const higherPriorityValue = getTStylingRangeNextDuplicate(tRange) ?\n      findStylingValue(tData, tNode, lView, prop, getTStylingRangeNext(tRange), isClassBased) :\n      undefined;\n  if (!isStylingValuePresent(higherPriorityValue)) {\n    // We don't have a next duplicate, or we did not find a duplicate value.\n    if (!isStylingValuePresent(value)) {\n      // We should delete current value or restore to lower priority value.\n      if (getTStylingRangePrevDuplicate(tRange)) {\n        // We have a possible prev duplicate, let's retrieve it.\n        value = findStylingValue(tData, null, lView, prop, bindingIndex, isClassBased);\n      }\n    }\n    const rNode = getNativeByIndex(getSelectedIndex(), lView) as RElement;\n    applyStyling(renderer, isClassBased, rNode, prop, value);\n  }\n}\n\n/**\n * Search for styling value with higher priority which is overwriting current value, or a\n * value of lower priority to which we should fall back if the value is `undefined`.\n *\n * When value is being applied at a location, related values need to be consulted.\n * - If there is a higher priority binding, we should be using that one instead.\n *   For example `<div  [style]=\"{color:exp1}\" [style.color]=\"exp2\">` change to `exp1`\n *   requires that we check `exp2` to see if it is set to value other than `undefined`.\n * - If there is a lower priority binding and we are changing to `undefined`\n *   For example `<div  [style]=\"{color:exp1}\" [style.color]=\"exp2\">` change to `exp2` to\n *   `undefined` requires that we check `exp1` (and static values) and use that as new value.\n *\n * NOTE: The styling stores two values.\n * 1. The raw value which came from the application is stored at `index + 0` location. (This value\n *    is used for dirty checking).\n * 2. The normalized value is stored at `index + 1`.\n *\n * @param tData `TData` used for traversing the priority.\n * @param tNode `TNode` to use for resolving static styling. Also controls search direction.\n *   - `TNode` search next and quit as soon as `isStylingValuePresent(value)` is true.\n *      If no value found consult `tNode.residualStyle`/`tNode.residualClass` for default value.\n *   - `null` search prev and go all the way to end. Return last value where\n *     `isStylingValuePresent(value)` is true.\n * @param lView `LView` used for retrieving the actual values.\n * @param prop Property which we are interested in.\n * @param index Starting index in the linked list of styling bindings where the search should start.\n * @param isClassBased `true` if `class` (`false` if `style`)\n */\nfunction findStylingValue(\n    tData: TData, tNode: TNode|null, lView: LView, prop: string, index: number,\n    isClassBased: boolean): any {\n  // `TNode` to use for resolving static styling. Also controls search direction.\n  //   - `TNode` search next and quit as soon as `isStylingValuePresent(value)` is true.\n  //      If no value found consult `tNode.residualStyle`/`tNode.residualClass` for default value.\n  //   - `null` search prev and go all the way to end. Return last value where\n  //     `isStylingValuePresent(value)` is true.\n  const isPrevDirection = tNode === null;\n  let value: any = undefined;\n  while (index > 0) {\n    const rawKey = tData[index] as TStylingKey;\n    const containsStatics = Array.isArray(rawKey);\n    // Unwrap the key if we contain static values.\n    const key = containsStatics ? (rawKey as string[])[1] : rawKey;\n    const isStylingMap = key === null;\n    let valueAtLViewIndex = lView[index + 1];\n    if (valueAtLViewIndex === NO_CHANGE) {\n      // In firstUpdatePass the styling instructions create a linked list of styling.\n      // On subsequent passes it is possible for a styling instruction to try to read a binding\n      // which\n      // has not yet executed. In that case we will find `NO_CHANGE` and we should assume that\n      // we have `undefined` (or empty array in case of styling-map instruction) instead. This\n      // allows the resolution to apply the value (which may later be overwritten when the\n      // binding actually executes.)\n      valueAtLViewIndex = isStylingMap ? EMPTY_ARRAY : undefined;\n    }\n    let currentValue = isStylingMap ? keyValueArrayGet(valueAtLViewIndex, prop) :\n                                      (key === prop ? valueAtLViewIndex : undefined);\n    if (containsStatics && !isStylingValuePresent(currentValue)) {\n      currentValue = keyValueArrayGet(rawKey as KeyValueArray<any>, prop);\n    }\n    if (isStylingValuePresent(currentValue)) {\n      value = currentValue;\n      if (isPrevDirection) {\n        return value;\n      }\n    }\n    const tRange = tData[index + 1] as TStylingRange;\n    index = isPrevDirection ? getTStylingRangePrev(tRange) : getTStylingRangeNext(tRange);\n  }\n  if (tNode !== null) {\n    // in case where we are going in next direction AND we did not find anything, we need to\n    // consult residual styling\n    let residual = isClassBased ? tNode.residualClasses : tNode.residualStyles;\n    if (residual != null /** OR residual !=== undefined */) {\n      value = keyValueArrayGet(residual!, prop);\n    }\n  }\n  return value;\n}\n\n/**\n * Determines if the binding value should be used (or if the value is 'undefined' and hence priority\n * resolution should be used.)\n *\n * @param value Binding style value.\n */\nfunction isStylingValuePresent(value: any): boolean {\n  // Currently only `undefined` value is considered non-binding. That is `undefined` says I don't\n  // have an opinion as to what this binding should be and you should consult other bindings by\n  // priority to determine the valid value.\n  // This is extracted into a single function so that we have a single place to control this.\n  return value !== undefined;\n}\n\n/**\n * Normalizes and/or adds a suffix to the value.\n *\n * If value is `null`/`undefined` no suffix is added\n * @param value\n * @param suffix\n */\nfunction normalizeSuffix(value: any, suffix: string|undefined|null): string|null|undefined|boolean {\n  if (value == null /** || value === undefined */) {\n    // do nothing\n  } else if (typeof suffix === 'string') {\n    value = value + suffix;\n  } else if (typeof value === 'object') {\n    value = stringify(unwrapSafeValue(value));\n  }\n  return value;\n}\n\n\n/**\n * Tests if the `TNode` has input shadow.\n *\n * An input shadow is when a directive steals (shadows) the input by using `@Input('style')` or\n * `@Input('class')` as input.\n *\n * @param tNode `TNode` which we would like to see if it has shadow.\n * @param isClassBased `true` if `class` (`false` if `style`)\n */\nexport function hasStylingInputShadow(tNode: TNode, isClassBased: boolean) {\n  return (tNode.flags & (isClassBased ? TNodeFlags.hasClassInput : TNodeFlags.hasStyleInput)) !== 0;\n}\n"]}