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/** * @fileoverview added by tsickle * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc */ import { setStylingMapsSyncFn } from './bindings'; import { getBindingValue, getValuesCount, isStylingValueDefined } from './util'; /** * Used to apply styling values presently within any map-based bindings on an element. * * Angular supports map-based styling bindings which can be applied via the * `[style]` and `[class]` bindings which can be placed on any HTML element. * These bindings can work independently, together or alongside prop-based * styling bindings (e.g. `<div [style]="x" [style.width]="w">`). * * If a map-based styling binding is detected by the compiler, the following * AOT code is produced: * * ```typescript * styleMap(ctx.styles); // styles = {key:value} * classMap(ctx.classes); // classes = {key:value}|string * ``` * * If and when either of the instructions above are evaluated, then the code * present in this file is included into the bundle. The mechanism used, to * activate support for map-based bindings at runtime is possible via the * `activeStylingMapFeature` function (which is also present in this file). * * # The Algorithm * Whenever a map-based binding updates (which is when the identity of the * map-value changes) then the map is iterated over and a `LStylingMap` array * is produced. The `LStylingMap` instance is stored in the binding location * where the `BINDING_INDEX` is situated when the `styleMap()` or `classMap()` * instruction were called. Once the binding changes, then the internal `bitMask` * value is marked as dirty. * * Styling values are applied once CD exits the element (which happens when * the `select(n)` instruction is called or the template function exits). When * this occurs, all prop-based bindings are applied. If a map-based binding is * present then a special flushing function (called a sync function) is made * available and it will be called each time a styling property is flushed. * * The flushing algorithm is designed to apply styling for a property (which is * a CSS property or a className value) one by one. If map-based bindings * are present, then the flushing algorithm will keep calling the maps styling * sync function each time a property is visited. This way, the flushing * behavior of map-based bindings will always be at the same property level * as the current prop-based property being iterated over (because everything * is alphabetically sorted). * * Let's imagine we have the following HTML template code: * * ```html * <div [style]="{width:'100px', height:'200px', 'z-index':'10'}" * [style.width.px]="200">...</div> * ``` * * When CD occurs, both the `[style]` and `[style.width]` bindings * are evaluated. Then when the styles are flushed on screen, the * following operations happen: * * 1. `[style.width]` is attempted to be written to the element. * * 2. Once that happens, the algorithm instructs the map-based * entries (`[style]` in this case) to "catch up" and apply * all values up to the `width` value. When this happens the * `height` value is applied to the element (since it is * alphabetically situated before the `width` property). * * 3. Since there are no more prop-based entries anymore, the * loop exits and then, just before the flushing ends, it * instructs all map-based bindings to "finish up" applying * their values. * * 4. The only remaining value within the map-based entries is * the `z-index` value (`width` got skipped because it was * successfully applied via the prop-based `[style.width]` * binding). Since all map-based entries are told to "finish up", * the `z-index` value is iterated over and it is then applied * to the element. * * The most important thing to take note of here is that prop-based * bindings are evaluated in order alongside map-based bindings. * This allows all styling across an element to be applied in O(n) * time (a similar algorithm is that of the array merge algorithm * in merge sort). * @type {?} */ export const syncStylingMap = (/** * @param {?} context * @param {?} renderer * @param {?} element * @param {?} data * @param {?} applyStylingFn * @param {?} sanitizer * @param {?} mode * @param {?=} targetProp * @param {?=} defaultValue * @return {?} */ (context, renderer, element, data, applyStylingFn, sanitizer, mode, targetProp, defaultValue) => { /** @type {?} */ let targetPropValueWasApplied = false; // once the map-based styling code is activate it is never deactivated. For this reason a // check to see if the current styling context has any map based bindings is required. /** @type {?} */ const totalMaps = getValuesCount(context, 2 /* MapBindingsPosition */); if (totalMaps) { /** @type {?} */ let runTheSyncAlgorithm = true; /** @type {?} */ const loopUntilEnd = !targetProp; // If the code is told to finish up (run until the end), but the mode // hasn't been flagged to apply values (it only traverses values) then // there is no point in iterating over the array because nothing will // be applied to the element. if (loopUntilEnd && (mode & ~1 /* ApplyAllValues */)) { runTheSyncAlgorithm = false; targetPropValueWasApplied = true; } if (runTheSyncAlgorithm) { targetPropValueWasApplied = innerSyncStylingMap(context, renderer, element, data, applyStylingFn, sanitizer, mode, targetProp || null, 0, defaultValue || null); } if (loopUntilEnd) { resetSyncCursors(); } } return targetPropValueWasApplied; }); /** * Recursive function designed to apply map-based styling to an element one map at a time. * * This function is designed to be called from the `syncStylingMap` function and will * apply map-based styling data one map at a time to the provided `element`. * * This function is recursive and it will call itself if a follow-up map value is to be * processed. To learn more about how the algorithm works, see `syncStylingMap`. * @param {?} context * @param {?} renderer * @param {?} element * @param {?} data * @param {?} applyStylingFn * @param {?} sanitizer * @param {?} mode * @param {?} targetProp * @param {?} currentMapIndex * @param {?} defaultValue * @return {?} */ function innerSyncStylingMap(context, renderer, element, data, applyStylingFn, sanitizer, mode, targetProp, currentMapIndex, defaultValue) { /** @type {?} */ let targetPropValueWasApplied = false; /** @type {?} */ const totalMaps = getValuesCount(context, 2 /* MapBindingsPosition */); if (currentMapIndex < totalMaps) { /** @type {?} */ const bindingIndex = (/** @type {?} */ (getBindingValue(context, 2 /* MapBindingsPosition */, currentMapIndex))); /** @type {?} */ const lStylingMap = (/** @type {?} */ (data[bindingIndex])); /** @type {?} */ let cursor = getCurrentSyncCursor(currentMapIndex); while (cursor < lStylingMap.length) { /** @type {?} */ const prop = getMapProp(lStylingMap, cursor); /** @type {?} */ const iteratedTooFar = targetProp && prop > targetProp; /** @type {?} */ const isTargetPropMatched = !iteratedTooFar && prop === targetProp; /** @type {?} */ const value = getMapValue(lStylingMap, cursor); /** @type {?} */ const valueIsDefined = isStylingValueDefined(value); // the recursive code is designed to keep applying until // it reaches or goes past the target prop. If and when // this happens then it will stop processing values, but // all other map values must also catch up to the same // point. This is why a recursive call is still issued // even if the code has iterated too far. /** @type {?} */ const innerMode = iteratedTooFar ? mode : resolveInnerMapMode(mode, valueIsDefined, isTargetPropMatched); /** @type {?} */ const innerProp = iteratedTooFar ? targetProp : prop; /** @type {?} */ let valueApplied = innerSyncStylingMap(context, renderer, element, data, applyStylingFn, sanitizer, innerMode, innerProp, currentMapIndex + 1, defaultValue); if (iteratedTooFar) { break; } if (!valueApplied && isValueAllowedToBeApplied(mode, isTargetPropMatched)) { /** @type {?} */ const useDefault = isTargetPropMatched && !valueIsDefined; /** @type {?} */ const valueToApply = useDefault ? defaultValue : value; /** @type {?} */ const bindingIndexToApply = useDefault ? bindingIndex : null; /** @type {?} */ const finalValue = sanitizer ? sanitizer(prop, valueToApply, 3 /* ValidateAndSanitize */) : valueToApply; applyStylingFn(renderer, element, prop, finalValue, bindingIndexToApply); valueApplied = true; } targetPropValueWasApplied = valueApplied && isTargetPropMatched; cursor += 2 /* TupleSize */; } setCurrentSyncCursor(currentMapIndex, cursor); } return targetPropValueWasApplied; } /** * Enables support for map-based styling bindings (e.g. `[style]` and `[class]` bindings). * @return {?} */ export function activeStylingMapFeature() { setStylingMapsSyncFn(syncStylingMap); } /** * Used to determine the mode for the inner recursive call. * * If an inner map is iterated on then this is done so for one * of two reasons: * * - The target property was detected and the inner map * must now "catch up" (pointer-wise) up to where the current * map's cursor is situated. * * - The target property was not detected in the current map * and must be found in an inner map. This can only be allowed * if the current map iteration is not set to skip the target * property. * @param {?} currentMode * @param {?} valueIsDefined * @param {?} isExactMatch * @return {?} */ function resolveInnerMapMode(currentMode, valueIsDefined, isExactMatch) { /** @type {?} */ let innerMode = currentMode; if (!valueIsDefined && isExactMatch && !(currentMode & 4 /* SkipTargetProp */)) { // case 1: set the mode to apply the targeted prop value if it // ends up being encountered in another map value innerMode |= 2 /* ApplyTargetProp */; innerMode &= ~4 /* SkipTargetProp */; } else { // case 2: set the mode to skip the targeted prop value if it // ends up being encountered in another map value innerMode |= 4 /* SkipTargetProp */; innerMode &= ~2 /* ApplyTargetProp */; } return innerMode; } /** * Decides whether or not a prop/value entry will be applied to an element. * * To determine whether or not a value is to be applied, * the following procedure is evaluated: * * First check to see the current `mode` status: * 1. If the mode value permits all props to be applied then allow. * - But do not allow if the current prop is set to be skipped. * 2. Otherwise if the current prop is permitted then allow. * @param {?} mode * @param {?} isTargetPropMatched * @return {?} */ function isValueAllowedToBeApplied(mode, isTargetPropMatched) { /** @type {?} */ let doApplyValue = (mode & 1 /* ApplyAllValues */) > 0; if (!doApplyValue) { if (mode & 2 /* ApplyTargetProp */) { doApplyValue = isTargetPropMatched; } } else if ((mode & 4 /* SkipTargetProp */) && isTargetPropMatched) { doApplyValue = false; } return doApplyValue; } /** * Used to keep track of concurrent cursor values for multiple map-based styling bindings present on * an element. * @type {?} */ const MAP_CURSORS = []; /** * Used to reset the state of each cursor value being used to iterate over map-based styling * bindings. * @return {?} */ function resetSyncCursors() { for (let i = 0; i < MAP_CURSORS.length; i++) { MAP_CURSORS[i] = 1 /* ValuesStartPosition */; } } /** * Returns an active cursor value at a given mapIndex location. * @param {?} mapIndex * @return {?} */ function getCurrentSyncCursor(mapIndex) { if (mapIndex >= MAP_CURSORS.length) { MAP_CURSORS.push(1 /* ValuesStartPosition */); } return MAP_CURSORS[mapIndex]; } /** * Sets a cursor value at a given mapIndex location. * @param {?} mapIndex * @param {?} indexValue * @return {?} */ function setCurrentSyncCursor(mapIndex, indexValue) { MAP_CURSORS[mapIndex] = indexValue; } /** * Used to convert a {key:value} map into a `LStylingMap` array. * * This function will either generate a new `LStylingMap` instance * or it will patch the provided `newValues` map value into an * existing `LStylingMap` value (this only happens if `bindingValue` * is an instance of `LStylingMap`). * * If a new key/value map is provided with an old `LStylingMap` * value then all properties will be overwritten with their new * values or with `null`. This means that the array will never * shrink in size (but it will also not be created and thrown * away whenever the {key:value} map entries change). * @param {?} bindingValue * @param {?} newValues * @return {?} */ export function normalizeIntoStylingMap(bindingValue, newValues) { /** @type {?} */ const lStylingMap = Array.isArray(bindingValue) ? bindingValue : [null]; lStylingMap[0 /* RawValuePosition */] = newValues || null; // because the new values may not include all the properties // that the old ones had, all values are set to `null` before // the new values are applied. This way, when flushed, the // styling algorithm knows exactly what style/class values // to remove from the element (since they are `null`). for (let j = 1 /* ValuesStartPosition */; j < lStylingMap.length; j += 2 /* TupleSize */) { setMapValue(lStylingMap, j, null); } /** @type {?} */ let props = null; /** @type {?} */ let map; /** @type {?} */ let allValuesTrue = false; if (typeof newValues === 'string') { // [class] bindings allow string values if (newValues.length) { props = newValues.split(/\s+/); allValuesTrue = true; } } else { props = newValues ? Object.keys(newValues) : null; map = newValues; } if (props) { outer: for (let i = 0; i < props.length; i++) { /** @type {?} */ const prop = (/** @type {?} */ (props[i])); /** @type {?} */ const value = allValuesTrue ? true : (/** @type {?} */ (map))[prop]; for (let j = 1 /* ValuesStartPosition */; j < lStylingMap.length; j += 2 /* TupleSize */) { /** @type {?} */ const propAtIndex = getMapProp(lStylingMap, j); if (prop <= propAtIndex) { if (propAtIndex === prop) { setMapValue(lStylingMap, j, value); } else { lStylingMap.splice(j, 0, prop, value); } continue outer; } } lStylingMap.push(prop, value); } } return lStylingMap; } /** * @param {?} map * @param {?} index * @return {?} */ export function getMapProp(map, index) { return (/** @type {?} */ (map[index + 0 /* PropOffset */])); } /** * @param {?} map * @param {?} index * @param {?} value * @return {?} */ export function setMapValue(map, index, value) { map[index + 1 /* ValueOffset */] = value; } /** * @param {?} map * @param {?} index * @return {?} */ export function getMapValue(map, index) { return (/** @type {?} */ (map[index + 1 /* ValueOffset */])); } //# 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@license\n* Copyright Google Inc. All Rights Reserved.\n*\n* Use of this source code is governed by an MIT-style license that can be\n* found in the LICENSE file at https://angular.io/license\n*/\nimport {StyleSanitizeFn, StyleSanitizeMode} from '../../sanitization/style_sanitizer';\nimport {ProceduralRenderer3, RElement, Renderer3} from '../interfaces/renderer';\n\nimport {setStylingMapsSyncFn} from './bindings';\nimport {ApplyStylingFn, LStylingData, LStylingMap, LStylingMapIndex, StylingMapsSyncMode, SyncStylingMapsFn, TStylingContext, TStylingContextIndex} from './interfaces';\nimport {getBindingValue, getValuesCount, isStylingValueDefined} from './util';\n\n\n/**\n * --------\n *\n * This file contains the algorithm logic for applying map-based bindings\n * such as `[style]` and `[class]`.\n *\n * --------\n */\n\n/**\n * Used to apply styling values presently within any map-based bindings on an element.\n *\n * Angular supports map-based styling bindings which can be applied via the\n * `[style]` and `[class]` bindings which can be placed on any HTML element.\n * These bindings can work independently, together or alongside prop-based\n * styling bindings (e.g. `<div [style]=\"x\" [style.width]=\"w\">`).\n *\n * If a map-based styling binding is detected by the compiler, the following\n * AOT code is produced:\n *\n * ```typescript\n * styleMap(ctx.styles); // styles = {key:value}\n * classMap(ctx.classes); // classes = {key:value}|string\n * ```\n *\n * If and when either of the instructions above are evaluated, then the code\n * present in this file is included into the bundle. The mechanism used, to\n * activate support for map-based bindings at runtime is possible via the\n * `activeStylingMapFeature` function (which is also present in this file).\n *\n * # The Algorithm\n * Whenever a map-based binding updates (which is when the identity of the\n * map-value changes) then the map is iterated over and a `LStylingMap` array\n * is produced. The `LStylingMap` instance is stored in the binding location\n * where the `BINDING_INDEX` is situated when the `styleMap()` or `classMap()`\n * instruction were called. Once the binding changes, then the internal `bitMask`\n * value is marked as dirty.\n *\n * Styling values are applied once CD exits the element (which happens when\n * the `select(n)` instruction is called or the template function exits). When\n * this occurs, all prop-based bindings are applied. If a map-based binding is\n * present then a special flushing function (called a sync function) is made\n * available and it will be called each time a styling property is flushed.\n *\n * The flushing algorithm is designed to apply styling for a property (which is\n * a CSS property or a className value) one by one. If map-based bindings\n * are present, then the flushing algorithm will keep calling the maps styling\n * sync function each time a property is visited. This way, the flushing\n * behavior of map-based bindings will always be at the same property level\n * as the current prop-based property being iterated over (because everything\n * is alphabetically sorted).\n *\n * Let's imagine we have the following HTML template code:\n *\n * ```html\n * <div [style]=\"{width:'100px', height:'200px', 'z-index':'10'}\"\n *      [style.width.px]=\"200\">...</div>\n * ```\n *\n * When CD occurs, both the `[style]` and `[style.width]` bindings\n * are evaluated. Then when the styles are flushed on screen, the\n * following operations happen:\n *\n * 1. `[style.width]` is attempted to be written to the element.\n *\n * 2.  Once that happens, the algorithm instructs the map-based\n *     entries (`[style]` in this case) to \"catch up\" and apply\n *     all values up to the `width` value. When this happens the\n *     `height` value is applied to the element (since it is\n *     alphabetically situated before the `width` property).\n *\n * 3. Since there are no more prop-based entries anymore, the\n *    loop exits and then, just before the flushing ends, it\n *    instructs all map-based bindings to \"finish up\" applying\n *    their values.\n *\n * 4. The only remaining value within the map-based entries is\n *    the `z-index` value (`width` got skipped because it was\n *    successfully applied via the prop-based `[style.width]`\n *    binding). Since all map-based entries are told to \"finish up\",\n *    the `z-index` value is iterated over and it is then applied\n *    to the element.\n *\n * The most important thing to take note of here is that prop-based\n * bindings are evaluated in order alongside map-based bindings.\n * This allows all styling across an element to be applied in O(n)\n * time (a similar algorithm is that of the array merge algorithm\n * in merge sort).\n */\nexport const syncStylingMap: SyncStylingMapsFn =\n    (context: TStylingContext, renderer: Renderer3 | ProceduralRenderer3 | null, element: RElement,\n     data: LStylingData, applyStylingFn: ApplyStylingFn, sanitizer: StyleSanitizeFn | null,\n     mode: StylingMapsSyncMode, targetProp?: string | null,\n     defaultValue?: string | null): boolean => {\n      let targetPropValueWasApplied = false;\n\n      // once the map-based styling code is activate it is never deactivated. For this reason a\n      // check to see if the current styling context has any map based bindings is required.\n      const totalMaps = getValuesCount(context, TStylingContextIndex.MapBindingsPosition);\n      if (totalMaps) {\n        let runTheSyncAlgorithm = true;\n        const loopUntilEnd = !targetProp;\n\n        // If the code is told to finish up (run until the end), but the mode\n        // hasn't been flagged to apply values (it only traverses values) then\n        // there is no point in iterating over the array because nothing will\n        // be applied to the element.\n        if (loopUntilEnd && (mode & ~StylingMapsSyncMode.ApplyAllValues)) {\n          runTheSyncAlgorithm = false;\n          targetPropValueWasApplied = true;\n        }\n\n        if (runTheSyncAlgorithm) {\n          targetPropValueWasApplied = innerSyncStylingMap(\n              context, renderer, element, data, applyStylingFn, sanitizer, mode, targetProp || null,\n              0, defaultValue || null);\n        }\n\n        if (loopUntilEnd) {\n          resetSyncCursors();\n        }\n      }\n\n      return targetPropValueWasApplied;\n    };\n\n/**\n * Recursive function designed to apply map-based styling to an element one map at a time.\n *\n * This function is designed to be called from the `syncStylingMap` function and will\n * apply map-based styling data one map at a time to the provided `element`.\n *\n * This function is recursive and it will call itself if a follow-up map value is to be\n * processed. To learn more about how the algorithm works, see `syncStylingMap`.\n */\nfunction innerSyncStylingMap(\n    context: TStylingContext, renderer: Renderer3 | ProceduralRenderer3 | null, element: RElement,\n    data: LStylingData, applyStylingFn: ApplyStylingFn, sanitizer: StyleSanitizeFn | null,\n    mode: StylingMapsSyncMode, targetProp: string | null, currentMapIndex: number,\n    defaultValue: string | null): boolean {\n  let targetPropValueWasApplied = false;\n\n  const totalMaps = getValuesCount(context, TStylingContextIndex.MapBindingsPosition);\n  if (currentMapIndex < totalMaps) {\n    const bindingIndex = getBindingValue(\n        context, TStylingContextIndex.MapBindingsPosition, currentMapIndex) as number;\n    const lStylingMap = data[bindingIndex] as LStylingMap;\n\n    let cursor = getCurrentSyncCursor(currentMapIndex);\n    while (cursor < lStylingMap.length) {\n      const prop = getMapProp(lStylingMap, cursor);\n      const iteratedTooFar = targetProp && prop > targetProp;\n      const isTargetPropMatched = !iteratedTooFar && prop === targetProp;\n      const value = getMapValue(lStylingMap, cursor);\n      const valueIsDefined = isStylingValueDefined(value);\n\n      // the recursive code is designed to keep applying until\n      // it reaches or goes past the target prop. If and when\n      // this happens then it will stop processing values, but\n      // all other map values must also catch up to the same\n      // point. This is why a recursive call is still issued\n      // even if the code has iterated too far.\n      const innerMode =\n          iteratedTooFar ? mode : resolveInnerMapMode(mode, valueIsDefined, isTargetPropMatched);\n      const innerProp = iteratedTooFar ? targetProp : prop;\n      let valueApplied = innerSyncStylingMap(\n          context, renderer, element, data, applyStylingFn, sanitizer, innerMode, innerProp,\n          currentMapIndex + 1, defaultValue);\n\n      if (iteratedTooFar) {\n        break;\n      }\n\n      if (!valueApplied && isValueAllowedToBeApplied(mode, isTargetPropMatched)) {\n        const useDefault = isTargetPropMatched && !valueIsDefined;\n        const valueToApply = useDefault ? defaultValue : value;\n        const bindingIndexToApply = useDefault ? bindingIndex : null;\n        const finalValue = sanitizer ?\n            sanitizer(prop, valueToApply, StyleSanitizeMode.ValidateAndSanitize) :\n            valueToApply;\n        applyStylingFn(renderer, element, prop, finalValue, bindingIndexToApply);\n        valueApplied = true;\n      }\n\n      targetPropValueWasApplied = valueApplied && isTargetPropMatched;\n      cursor += LStylingMapIndex.TupleSize;\n    }\n    setCurrentSyncCursor(currentMapIndex, cursor);\n  }\n\n  return targetPropValueWasApplied;\n}\n\n\n/**\n * Enables support for map-based styling bindings (e.g. `[style]` and `[class]` bindings).\n */\nexport function activeStylingMapFeature() {\n  setStylingMapsSyncFn(syncStylingMap);\n}\n\n/**\n * Used to determine the mode for the inner recursive call.\n *\n * If an inner map is iterated on then this is done so for one\n * of two reasons:\n *\n * - The target property was detected and the inner map\n *   must now \"catch up\" (pointer-wise) up to where the current\n *   map's cursor is situated.\n *\n * - The target property was not detected in the current map\n *   and must be found in an inner map. This can only be allowed\n *   if the current map iteration is not set to skip the target\n *   property.\n */\nfunction resolveInnerMapMode(\n    currentMode: number, valueIsDefined: boolean, isExactMatch: boolean): number {\n  let innerMode = currentMode;\n  if (!valueIsDefined && isExactMatch && !(currentMode & StylingMapsSyncMode.SkipTargetProp)) {\n    // case 1: set the mode to apply the targeted prop value if it\n    // ends up being encountered in another map value\n    innerMode |= StylingMapsSyncMode.ApplyTargetProp;\n    innerMode &= ~StylingMapsSyncMode.SkipTargetProp;\n  } else {\n    // case 2: set the mode to skip the targeted prop value if it\n    // ends up being encountered in another map value\n    innerMode |= StylingMapsSyncMode.SkipTargetProp;\n    innerMode &= ~StylingMapsSyncMode.ApplyTargetProp;\n  }\n  return innerMode;\n}\n\n/**\n * Decides whether or not a prop/value entry will be applied to an element.\n *\n * To determine whether or not a value is to be applied,\n * the following procedure is evaluated:\n *\n * First check to see the current `mode` status:\n *  1. If the mode value permits all props to be applied then allow.\n *    - But do not allow if the current prop is set to be skipped.\n *  2. Otherwise if the current prop is permitted then allow.\n */\nfunction isValueAllowedToBeApplied(mode: number, isTargetPropMatched: boolean) {\n  let doApplyValue = (mode & StylingMapsSyncMode.ApplyAllValues) > 0;\n  if (!doApplyValue) {\n    if (mode & StylingMapsSyncMode.ApplyTargetProp) {\n      doApplyValue = isTargetPropMatched;\n    }\n  } else if ((mode & StylingMapsSyncMode.SkipTargetProp) && isTargetPropMatched) {\n    doApplyValue = false;\n  }\n  return doApplyValue;\n}\n\n/**\n * Used to keep track of concurrent cursor values for multiple map-based styling bindings present on\n * an element.\n */\nconst MAP_CURSORS: number[] = [];\n\n/**\n * Used to reset the state of each cursor value being used to iterate over map-based styling\n * bindings.\n */\nfunction resetSyncCursors() {\n  for (let i = 0; i < MAP_CURSORS.length; i++) {\n    MAP_CURSORS[i] = LStylingMapIndex.ValuesStartPosition;\n  }\n}\n\n/**\n * Returns an active cursor value at a given mapIndex location.\n */\nfunction getCurrentSyncCursor(mapIndex: number) {\n  if (mapIndex >= MAP_CURSORS.length) {\n    MAP_CURSORS.push(LStylingMapIndex.ValuesStartPosition);\n  }\n  return MAP_CURSORS[mapIndex];\n}\n\n/**\n * Sets a cursor value at a given mapIndex location.\n */\nfunction setCurrentSyncCursor(mapIndex: number, indexValue: number) {\n  MAP_CURSORS[mapIndex] = indexValue;\n}\n\n/**\n * Used to convert a {key:value} map into a `LStylingMap` array.\n *\n * This function will either generate a new `LStylingMap` instance\n * or it will patch the provided `newValues` map value into an\n * existing `LStylingMap` value (this only happens if `bindingValue`\n * is an instance of `LStylingMap`).\n *\n * If a new key/value map is provided with an old `LStylingMap`\n * value then all properties will be overwritten with their new\n * values or with `null`. This means that the array will never\n * shrink in size (but it will also not be created and thrown\n * away whenever the {key:value} map entries change).\n */\nexport function normalizeIntoStylingMap(\n    bindingValue: null | LStylingMap,\n    newValues: {[key: string]: any} | string | null | undefined): LStylingMap {\n  const lStylingMap: LStylingMap = Array.isArray(bindingValue) ? bindingValue : [null];\n  lStylingMap[LStylingMapIndex.RawValuePosition] = newValues || null;\n\n  // because the new values may not include all the properties\n  // that the old ones had, all values are set to `null` before\n  // the new values are applied. This way, when flushed, the\n  // styling algorithm knows exactly what style/class values\n  // to remove from the element (since they are `null`).\n  for (let j = LStylingMapIndex.ValuesStartPosition; j < lStylingMap.length;\n       j += LStylingMapIndex.TupleSize) {\n    setMapValue(lStylingMap, j, null);\n  }\n\n  let props: string[]|null = null;\n  let map: {[key: string]: any}|undefined|null;\n  let allValuesTrue = false;\n  if (typeof newValues === 'string') {  // [class] bindings allow string values\n    if (newValues.length) {\n      props = newValues.split(/\\s+/);\n      allValuesTrue = true;\n    }\n  } else {\n    props = newValues ? Object.keys(newValues) : null;\n    map = newValues;\n  }\n\n  if (props) {\n    outer: for (let i = 0; i < props.length; i++) {\n      const prop = props[i] as string;\n      const value = allValuesTrue ? true : map ![prop];\n      for (let j = LStylingMapIndex.ValuesStartPosition; j < lStylingMap.length;\n           j += LStylingMapIndex.TupleSize) {\n        const propAtIndex = getMapProp(lStylingMap, j);\n        if (prop <= propAtIndex) {\n          if (propAtIndex === prop) {\n            setMapValue(lStylingMap, j, value);\n          } else {\n            lStylingMap.splice(j, 0, prop, value);\n          }\n          continue outer;\n        }\n      }\n      lStylingMap.push(prop, value);\n    }\n  }\n\n  return lStylingMap;\n}\n\nexport function getMapProp(map: LStylingMap, index: number): string {\n  return map[index + LStylingMapIndex.PropOffset] as string;\n}\n\nexport function setMapValue(map: LStylingMap, index: number, value: string | null): void {\n  map[index + LStylingMapIndex.ValueOffset] = value;\n}\n\nexport function getMapValue(map: LStylingMap, index: number): string|null {\n  return map[index + LStylingMapIndex.ValueOffset] as string | null;\n}\n"]}