/**
 * @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 '../../util/ng_dev_mode';
import '../../util/ng_i18n_closure_mode';
import { getTemplateContent, URI_ATTRS, VALID_ATTRS, VALID_ELEMENTS } from '../../sanitization/html_sanitizer';
import { getInertBodyHelper } from '../../sanitization/inert_body';
import { _sanitizeUrl } from '../../sanitization/url_sanitizer';
import { assertDefined, assertEqual, assertGreaterThanOrEqual, assertOneOf, assertString } from '../../util/assert';
import { loadIcuContainerVisitor } from '../instructions/i18n_icu_container_visitor';
import { allocExpando, createTNodeAtIndex } from '../instructions/shared';
import { getDocument } from '../interfaces/document';
import { ELEMENT_MARKER, I18nCreateOpCode, ICU_MARKER } from '../interfaces/i18n';
import { HEADER_OFFSET } from '../interfaces/view';
import { getCurrentParentTNode, getCurrentTNode, setCurrentTNode } from '../state';
import { attachDebugGetter } from '../util/debug_utils';
import { i18nCreateOpCodesToString, i18nRemoveOpCodesToString, i18nUpdateOpCodesToString, icuCreateOpCodesToString } from './i18n_debug';
import { addTNodeAndUpdateInsertBeforeIndex } from './i18n_insert_before_index';
import { ensureIcuContainerVisitorLoaded } from './i18n_tree_shaking';
import { createTNodePlaceholder, icuCreateOpCode, setTIcu, setTNodeInsertBeforeIndex } from './i18n_util';
const BINDING_REGEXP = /�(\d+):?\d*�/gi;
const ICU_REGEXP = /({\s*�\d+:?\d*�\s*,\s*\S{6}\s*,[\s\S]*})/gi;
const NESTED_ICU = /�(\d+)�/;
const ICU_BLOCK_REGEXP = /^\s*(�\d+:?\d*�)\s*,\s*(select|plural)\s*,/;
const MARKER = `�`;
const SUBTEMPLATE_REGEXP = /�\/?\*(\d+:\d+)�/gi;
const PH_REGEXP = /�(\/?[#*]\d+):?\d*�/gi;
/**
 * Angular Dart introduced &ngsp; as a placeholder for non-removable space, see:
 * https://github.com/dart-lang/angular/blob/0bb611387d29d65b5af7f9d2515ab571fd3fbee4/_tests/test/compiler/preserve_whitespace_test.dart#L25-L32
 * In Angular Dart &ngsp; is converted to the 0xE500 PUA (Private Use Areas) unicode character
 * and later on replaced by a space. We are re-implementing the same idea here, since translations
 * might contain this special character.
 */
const NGSP_UNICODE_REGEXP = /\uE500/g;
function replaceNgsp(value) {
    return value.replace(NGSP_UNICODE_REGEXP, ' ');
}
/**
 * Create dynamic nodes from i18n translation block.
 *
 * - Text nodes are created synchronously
 * - TNodes are linked into tree lazily
 *
 * @param tView Current `TView`
 * @parentTNodeIndex index to the parent TNode of this i18n block
 * @param lView Current `LView`
 * @param index Index of `ɵɵi18nStart` instruction.
 * @param message Message to translate.
 * @param subTemplateIndex Index into the sub template of message translation. (ie in case of
 *     `ngIf`) (-1 otherwise)
 */
export function i18nStartFirstCreatePass(tView, parentTNodeIndex, lView, index, message, subTemplateIndex) {
    const rootTNode = getCurrentParentTNode();
    const createOpCodes = [];
    const updateOpCodes = [];
    const existingTNodeStack = [[]];
    if (ngDevMode) {
        attachDebugGetter(createOpCodes, i18nCreateOpCodesToString);
        attachDebugGetter(updateOpCodes, i18nUpdateOpCodesToString);
    }
    message = getTranslationForTemplate(message, subTemplateIndex);
    const msgParts = replaceNgsp(message).split(PH_REGEXP);
    for (let i = 0; i < msgParts.length; i++) {
        let value = msgParts[i];
        if ((i & 1) === 0) {
            // Even indexes are text (including bindings & ICU expressions)
            const parts = i18nParseTextIntoPartsAndICU(value);
            for (let j = 0; j < parts.length; j++) {
                let part = parts[j];
                if ((j & 1) === 0) {
                    // `j` is odd therefore `part` is string
                    const text = part;
                    ngDevMode && assertString(text, 'Parsed ICU part should be string');
                    if (text !== '') {
                        i18nStartFirstCreatePassProcessTextNode(tView, rootTNode, existingTNodeStack[0], createOpCodes, updateOpCodes, lView, text);
                    }
                }
                else {
                    // `j` is Even therefor `part` is an `ICUExpression`
                    const icuExpression = part;
                    // Verify that ICU expression has the right shape. Translations might contain invalid
                    // constructions (while original messages were correct), so ICU parsing at runtime may
                    // not succeed (thus `icuExpression` remains a string).
                    // Note: we intentionally retain the error here by not using `ngDevMode`, because
                    // the value can change based on the locale and users aren't guaranteed to hit
                    // an invalid string while they're developing.
                    if (typeof icuExpression !== 'object') {
                        throw new Error(`Unable to parse ICU expression in "${message}" message.`);
                    }
                    const icuContainerTNode = createTNodeAndAddOpCode(tView, rootTNode, existingTNodeStack[0], lView, createOpCodes, ngDevMode ? `ICU ${index}:${icuExpression.mainBinding}` : '', true);
                    const icuNodeIndex = icuContainerTNode.index;
                    ngDevMode &&
                        assertGreaterThanOrEqual(icuNodeIndex, HEADER_OFFSET, 'Index must be in absolute LView offset');
                    icuStart(tView, lView, updateOpCodes, parentTNodeIndex, icuExpression, icuNodeIndex);
                }
            }
        }
        else {
            // Odd indexes are placeholders (elements and sub-templates)
            // At this point value is something like: '/#1:2' (originally coming from '�/#1:2�')
            const isClosing = value.charCodeAt(0) === 47 /* CharCode.SLASH */;
            const type = value.charCodeAt(isClosing ? 1 : 0);
            ngDevMode && assertOneOf(type, 42 /* CharCode.STAR */, 35 /* CharCode.HASH */);
            const index = HEADER_OFFSET + Number.parseInt(value.substring((isClosing ? 2 : 1)));
            if (isClosing) {
                existingTNodeStack.shift();
                setCurrentTNode(getCurrentParentTNode(), false);
            }
            else {
                const tNode = createTNodePlaceholder(tView, existingTNodeStack[0], index);
                existingTNodeStack.unshift([]);
                setCurrentTNode(tNode, true);
            }
        }
    }
    tView.data[index] = {
        create: createOpCodes,
        update: updateOpCodes,
    };
}
/**
 * Allocate space in i18n Range add create OpCode instruction to create a text or comment node.
 *
 * @param tView Current `TView` needed to allocate space in i18n range.
 * @param rootTNode Root `TNode` of the i18n block. This node determines if the new TNode will be
 *     added as part of the `i18nStart` instruction or as part of the `TNode.insertBeforeIndex`.
 * @param existingTNodes internal state for `addTNodeAndUpdateInsertBeforeIndex`.
 * @param lView Current `LView` needed to allocate space in i18n range.
 * @param createOpCodes Array storing `I18nCreateOpCodes` where new opCodes will be added.
 * @param text Text to be added when the `Text` or `Comment` node will be created.
 * @param isICU true if a `Comment` node for ICU (instead of `Text`) node should be created.
 */
function createTNodeAndAddOpCode(tView, rootTNode, existingTNodes, lView, createOpCodes, text, isICU) {
    const i18nNodeIdx = allocExpando(tView, lView, 1, null);
    let opCode = i18nNodeIdx << I18nCreateOpCode.SHIFT;
    let parentTNode = getCurrentParentTNode();
    if (rootTNode === parentTNode) {
        // FIXME(misko): A null `parentTNode` should represent when we fall of the `LView` boundary.
        // (there is no parent), but in some circumstances (because we are inconsistent about how we set
        // `previousOrParentTNode`) it could point to `rootTNode` So this is a work around.
        parentTNode = null;
    }
    if (parentTNode === null) {
        // If we don't have a parent that means that we can eagerly add nodes.
        // If we have a parent than these nodes can't be added now (as the parent has not been created
        // yet) and instead the `parentTNode` is responsible for adding it. See
        // `TNode.insertBeforeIndex`
        opCode |= I18nCreateOpCode.APPEND_EAGERLY;
    }
    if (isICU) {
        opCode |= I18nCreateOpCode.COMMENT;
        ensureIcuContainerVisitorLoaded(loadIcuContainerVisitor);
    }
    createOpCodes.push(opCode, text === null ? '' : text);
    // We store `{{?}}` so that when looking at debug `TNodeType.template` we can see where the
    // bindings are.
    const tNode = createTNodeAtIndex(tView, i18nNodeIdx, isICU ? 32 /* TNodeType.Icu */ : 1 /* TNodeType.Text */, text === null ? (ngDevMode ? '{{?}}' : '') : text, null);
    addTNodeAndUpdateInsertBeforeIndex(existingTNodes, tNode);
    const tNodeIdx = tNode.index;
    setCurrentTNode(tNode, false /* Text nodes are self closing */);
    if (parentTNode !== null && rootTNode !== parentTNode) {
        // We are a child of deeper node (rather than a direct child of `i18nStart` instruction.)
        // We have to make sure to add ourselves to the parent.
        setTNodeInsertBeforeIndex(parentTNode, tNodeIdx);
    }
    return tNode;
}
/**
 * Processes text node in i18n block.
 *
 * Text nodes can have:
 * - Create instruction in `createOpCodes` for creating the text node.
 * - Allocate spec for text node in i18n range of `LView`
 * - If contains binding:
 *    - bindings => allocate space in i18n range of `LView` to store the binding value.
 *    - populate `updateOpCodes` with update instructions.
 *
 * @param tView Current `TView`
 * @param rootTNode Root `TNode` of the i18n block. This node determines if the new TNode will
 *     be added as part of the `i18nStart` instruction or as part of the
 *     `TNode.insertBeforeIndex`.
 * @param existingTNodes internal state for `addTNodeAndUpdateInsertBeforeIndex`.
 * @param createOpCodes Location where the creation OpCodes will be stored.
 * @param lView Current `LView`
 * @param text The translated text (which may contain binding)
 */
function i18nStartFirstCreatePassProcessTextNode(tView, rootTNode, existingTNodes, createOpCodes, updateOpCodes, lView, text) {
    const hasBinding = text.match(BINDING_REGEXP);
    const tNode = createTNodeAndAddOpCode(tView, rootTNode, existingTNodes, lView, createOpCodes, hasBinding ? null : text, false);
    if (hasBinding) {
        generateBindingUpdateOpCodes(updateOpCodes, text, tNode.index, null, 0, null);
    }
}
/**
 * See `i18nAttributes` above.
 */
export function i18nAttributesFirstPass(tView, index, values) {
    const previousElement = getCurrentTNode();
    const previousElementIndex = previousElement.index;
    const updateOpCodes = [];
    if (ngDevMode) {
        attachDebugGetter(updateOpCodes, i18nUpdateOpCodesToString);
    }
    if (tView.firstCreatePass && tView.data[index] === null) {
        for (let i = 0; i < values.length; i += 2) {
            const attrName = values[i];
            const message = values[i + 1];
            if (message !== '') {
                // Check if attribute value contains an ICU and throw an error if that's the case.
                // ICUs in element attributes are not supported.
                // Note: we intentionally retain the error here by not using `ngDevMode`, because
                // the `value` can change based on the locale and users aren't guaranteed to hit
                // an invalid string while they're developing.
                if (ICU_REGEXP.test(message)) {
                    throw new Error(`ICU expressions are not supported in attributes. Message: "${message}".`);
                }
                // i18n attributes that hit this code path are guaranteed to have bindings, because
                // the compiler treats static i18n attributes as regular attribute bindings.
                // Since this may not be the first i18n attribute on this element we need to pass in how
                // many previous bindings there have already been.
                generateBindingUpdateOpCodes(updateOpCodes, message, previousElementIndex, attrName, countBindings(updateOpCodes), null);
            }
        }
        tView.data[index] = updateOpCodes;
    }
}
/**
 * Generate the OpCodes to update the bindings of a string.
 *
 * @param updateOpCodes Place where the update opcodes will be stored.
 * @param str The string containing the bindings.
 * @param destinationNode Index of the destination node which will receive the binding.
 * @param attrName Name of the attribute, if the string belongs to an attribute.
 * @param sanitizeFn Sanitization function used to sanitize the string after update, if necessary.
 * @param bindingStart The lView index of the next expression that can be bound via an opCode.
 * @returns The mask value for these bindings
 */
function generateBindingUpdateOpCodes(updateOpCodes, str, destinationNode, attrName, bindingStart, sanitizeFn) {
    ngDevMode &&
        assertGreaterThanOrEqual(destinationNode, HEADER_OFFSET, 'Index must be in absolute LView offset');
    const maskIndex = updateOpCodes.length; // Location of mask
    const sizeIndex = maskIndex + 1; // location of size for skipping
    updateOpCodes.push(null, null); // Alloc space for mask and size
    const startIndex = maskIndex + 2; // location of first allocation.
    if (ngDevMode) {
        attachDebugGetter(updateOpCodes, i18nUpdateOpCodesToString);
    }
    const textParts = str.split(BINDING_REGEXP);
    let mask = 0;
    for (let j = 0; j < textParts.length; j++) {
        const textValue = textParts[j];
        if (j & 1) {
            // Odd indexes are bindings
            const bindingIndex = bindingStart + parseInt(textValue, 10);
            updateOpCodes.push(-1 - bindingIndex);
            mask = mask | toMaskBit(bindingIndex);
        }
        else if (textValue !== '') {
            // Even indexes are text
            updateOpCodes.push(textValue);
        }
    }
    updateOpCodes.push(destinationNode << 2 /* I18nUpdateOpCode.SHIFT_REF */ |
        (attrName ? 1 /* I18nUpdateOpCode.Attr */ : 0 /* I18nUpdateOpCode.Text */));
    if (attrName) {
        updateOpCodes.push(attrName, sanitizeFn);
    }
    updateOpCodes[maskIndex] = mask;
    updateOpCodes[sizeIndex] = updateOpCodes.length - startIndex;
    return mask;
}
/**
 * Count the number of bindings in the given `opCodes`.
 *
 * It could be possible to speed this up, by passing the number of bindings found back from
 * `generateBindingUpdateOpCodes()` to `i18nAttributesFirstPass()` but this would then require more
 * complexity in the code and/or transient objects to be created.
 *
 * Since this function is only called once when the template is instantiated, is trivial in the
 * first instance (since `opCodes` will be an empty array), and it is not common for elements to
 * contain multiple i18n bound attributes, it seems like this is a reasonable compromise.
 */
function countBindings(opCodes) {
    let count = 0;
    for (let i = 0; i < opCodes.length; i++) {
        const opCode = opCodes[i];
        // Bindings are negative numbers.
        if (typeof opCode === 'number' && opCode < 0) {
            count++;
        }
    }
    return count;
}
/**
 * Convert binding index to mask bit.
 *
 * Each index represents a single bit on the bit-mask. Because bit-mask only has 32 bits, we make
 * the 32nd bit share all masks for all bindings higher than 32. Since it is extremely rare to
 * have more than 32 bindings this will be hit very rarely. The downside of hitting this corner
 * case is that we will execute binding code more often than necessary. (penalty of performance)
 */
function toMaskBit(bindingIndex) {
    return 1 << Math.min(bindingIndex, 31);
}
export function isRootTemplateMessage(subTemplateIndex) {
    return subTemplateIndex === -1;
}
/**
 * Removes everything inside the sub-templates of a message.
 */
function removeInnerTemplateTranslation(message) {
    let match;
    let res = '';
    let index = 0;
    let inTemplate = false;
    let tagMatched;
    while ((match = SUBTEMPLATE_REGEXP.exec(message)) !== null) {
        if (!inTemplate) {
            res += message.substring(index, match.index + match[0].length);
            tagMatched = match[1];
            inTemplate = true;
        }
        else {
            if (match[0] === `${MARKER}/*${tagMatched}${MARKER}`) {
                index = match.index;
                inTemplate = false;
            }
        }
    }
    ngDevMode &&
        assertEqual(inTemplate, false, `Tag mismatch: unable to find the end of the sub-template in the translation "${message}"`);
    res += message.slice(index);
    return res;
}
/**
 * Extracts a part of a message and removes the rest.
 *
 * This method is used for extracting a part of the message associated with a template. A
 * translated message can span multiple templates.
 *
 * Example:
 * ```
 * <div i18n>Translate <span *ngIf>me</span>!</div>
 * ```
 *
 * @param message The message to crop
 * @param subTemplateIndex Index of the sub-template to extract. If undefined it returns the
 * external template and removes all sub-templates.
 */
export function getTranslationForTemplate(message, subTemplateIndex) {
    if (isRootTemplateMessage(subTemplateIndex)) {
        // We want the root template message, ignore all sub-templates
        return removeInnerTemplateTranslation(message);
    }
    else {
        // We want a specific sub-template
        const start = message.indexOf(`:${subTemplateIndex}${MARKER}`) + 2 + subTemplateIndex.toString().length;
        const end = message.search(new RegExp(`${MARKER}\\/\\*\\d+:${subTemplateIndex}${MARKER}`));
        return removeInnerTemplateTranslation(message.substring(start, end));
    }
}
/**
 * Generate the OpCodes for ICU expressions.
 *
 * @param icuExpression
 * @param index Index where the anchor is stored and an optional `TIcuContainerNode`
 *   - `lView[anchorIdx]` points to a `Comment` node representing the anchor for the ICU.
 *   - `tView.data[anchorIdx]` points to the `TIcuContainerNode` if ICU is root (`null` otherwise)
 */
export function icuStart(tView, lView, updateOpCodes, parentIdx, icuExpression, anchorIdx) {
    ngDevMode && assertDefined(icuExpression, 'ICU expression must be defined');
    let bindingMask = 0;
    const tIcu = {
        type: icuExpression.type,
        currentCaseLViewIndex: allocExpando(tView, lView, 1, null),
        anchorIdx,
        cases: [],
        create: [],
        remove: [],
        update: []
    };
    addUpdateIcuSwitch(updateOpCodes, icuExpression, anchorIdx);
    setTIcu(tView, anchorIdx, tIcu);
    const values = icuExpression.values;
    for (let i = 0; i < values.length; i++) {
        // Each value is an array of strings & other ICU expressions
        const valueArr = values[i];
        const nestedIcus = [];
        for (let j = 0; j < valueArr.length; j++) {
            const value = valueArr[j];
            if (typeof value !== 'string') {
                // It is an nested ICU expression
                const icuIndex = nestedIcus.push(value) - 1;
                // Replace nested ICU expression by a comment node
                valueArr[j] = `<!--�${icuIndex}�-->`;
            }
        }
        bindingMask = parseIcuCase(tView, tIcu, lView, updateOpCodes, parentIdx, icuExpression.cases[i], valueArr.join(''), nestedIcus) |
            bindingMask;
    }
    if (bindingMask) {
        addUpdateIcuUpdate(updateOpCodes, bindingMask, anchorIdx);
    }
}
/**
 * Parses text containing an ICU expression and produces a JSON object for it.
 * Original code from closure library, modified for Angular.
 *
 * @param pattern Text containing an ICU expression that needs to be parsed.
 *
 */
export function parseICUBlock(pattern) {
    const cases = [];
    const values = [];
    let icuType = 1 /* IcuType.plural */;
    let mainBinding = 0;
    pattern = pattern.replace(ICU_BLOCK_REGEXP, function (str, binding, type) {
        if (type === 'select') {
            icuType = 0 /* IcuType.select */;
        }
        else {
            icuType = 1 /* IcuType.plural */;
        }
        mainBinding = parseInt(binding.slice(1), 10);
        return '';
    });
    const parts = i18nParseTextIntoPartsAndICU(pattern);
    // Looking for (key block)+ sequence. One of the keys has to be "other".
    for (let pos = 0; pos < parts.length;) {
        let key = parts[pos++].trim();
        if (icuType === 1 /* IcuType.plural */) {
            // Key can be "=x", we just want "x"
            key = key.replace(/\s*(?:=)?(\w+)\s*/, '$1');
        }
        if (key.length) {
            cases.push(key);
        }
        const blocks = i18nParseTextIntoPartsAndICU(parts[pos++]);
        if (cases.length > values.length) {
            values.push(blocks);
        }
    }
    // TODO(ocombe): support ICU expressions in attributes, see #21615
    return { type: icuType, mainBinding: mainBinding, cases, values };
}
/**
 * Breaks pattern into strings and top level {...} blocks.
 * Can be used to break a message into text and ICU expressions, or to break an ICU expression
 * into keys and cases. Original code from closure library, modified for Angular.
 *
 * @param pattern (sub)Pattern to be broken.
 * @returns An `Array<string|IcuExpression>` where:
 *   - odd positions: `string` => text between ICU expressions
 *   - even positions: `ICUExpression` => ICU expression parsed into `ICUExpression` record.
 */
export function i18nParseTextIntoPartsAndICU(pattern) {
    if (!pattern) {
        return [];
    }
    let prevPos = 0;
    const braceStack = [];
    const results = [];
    const braces = /[{}]/g;
    // lastIndex doesn't get set to 0 so we have to.
    braces.lastIndex = 0;
    let match;
    while (match = braces.exec(pattern)) {
        const pos = match.index;
        if (match[0] == '}') {
            braceStack.pop();
            if (braceStack.length == 0) {
                // End of the block.
                const block = pattern.substring(prevPos, pos);
                if (ICU_BLOCK_REGEXP.test(block)) {
                    results.push(parseICUBlock(block));
                }
                else {
                    results.push(block);
                }
                prevPos = pos + 1;
            }
        }
        else {
            if (braceStack.length == 0) {
                const substring = pattern.substring(prevPos, pos);
                results.push(substring);
                prevPos = pos + 1;
            }
            braceStack.push('{');
        }
    }
    const substring = pattern.substring(prevPos);
    results.push(substring);
    return results;
}
/**
 * Parses a node, its children and its siblings, and generates the mutate & update OpCodes.
 *
 */
export function parseIcuCase(tView, tIcu, lView, updateOpCodes, parentIdx, caseName, unsafeCaseHtml, nestedIcus) {
    const create = [];
    const remove = [];
    const update = [];
    if (ngDevMode) {
        attachDebugGetter(create, icuCreateOpCodesToString);
        attachDebugGetter(remove, i18nRemoveOpCodesToString);
        attachDebugGetter(update, i18nUpdateOpCodesToString);
    }
    tIcu.cases.push(caseName);
    tIcu.create.push(create);
    tIcu.remove.push(remove);
    tIcu.update.push(update);
    const inertBodyHelper = getInertBodyHelper(getDocument());
    const inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeCaseHtml);
    ngDevMode && assertDefined(inertBodyElement, 'Unable to generate inert body element');
    const inertRootNode = getTemplateContent(inertBodyElement) || inertBodyElement;
    if (inertRootNode) {
        return walkIcuTree(tView, tIcu, lView, updateOpCodes, create, remove, update, inertRootNode, parentIdx, nestedIcus, 0);
    }
    else {
        return 0;
    }
}
function walkIcuTree(tView, tIcu, lView, sharedUpdateOpCodes, create, remove, update, parentNode, parentIdx, nestedIcus, depth) {
    let bindingMask = 0;
    let currentNode = parentNode.firstChild;
    while (currentNode) {
        const newIndex = allocExpando(tView, lView, 1, null);
        switch (currentNode.nodeType) {
            case Node.ELEMENT_NODE:
                const element = currentNode;
                const tagName = element.tagName.toLowerCase();
                if (VALID_ELEMENTS.hasOwnProperty(tagName)) {
                    addCreateNodeAndAppend(create, ELEMENT_MARKER, tagName, parentIdx, newIndex);
                    tView.data[newIndex] = tagName;
                    const elAttrs = element.attributes;
                    for (let i = 0; i < elAttrs.length; i++) {
                        const attr = elAttrs.item(i);
                        const lowerAttrName = attr.name.toLowerCase();
                        const hasBinding = !!attr.value.match(BINDING_REGEXP);
                        // we assume the input string is safe, unless it's using a binding
                        if (hasBinding) {
                            if (VALID_ATTRS.hasOwnProperty(lowerAttrName)) {
                                if (URI_ATTRS[lowerAttrName]) {
                                    generateBindingUpdateOpCodes(update, attr.value, newIndex, attr.name, 0, _sanitizeUrl);
                                }
                                else {
                                    generateBindingUpdateOpCodes(update, attr.value, newIndex, attr.name, 0, null);
                                }
                            }
                            else {
                                ngDevMode &&
                                    console.warn(`WARNING: ignoring unsafe attribute value ` +
                                        `${lowerAttrName} on element ${tagName} ` +
                                        `(see https://g.co/ng/security#xss)`);
                            }
                        }
                        else {
                            addCreateAttribute(create, newIndex, attr);
                        }
                    }
                    // Parse the children of this node (if any)
                    bindingMask = walkIcuTree(tView, tIcu, lView, sharedUpdateOpCodes, create, remove, update, currentNode, newIndex, nestedIcus, depth + 1) |
                        bindingMask;
                    addRemoveNode(remove, newIndex, depth);
                }
                break;
            case Node.TEXT_NODE:
                const value = currentNode.textContent || '';
                const hasBinding = value.match(BINDING_REGEXP);
                addCreateNodeAndAppend(create, null, hasBinding ? '' : value, parentIdx, newIndex);
                addRemoveNode(remove, newIndex, depth);
                if (hasBinding) {
                    bindingMask =
                        generateBindingUpdateOpCodes(update, value, newIndex, null, 0, null) | bindingMask;
                }
                break;
            case Node.COMMENT_NODE:
                // Check if the comment node is a placeholder for a nested ICU
                const isNestedIcu = NESTED_ICU.exec(currentNode.textContent || '');
                if (isNestedIcu) {
                    const nestedIcuIndex = parseInt(isNestedIcu[1], 10);
                    const icuExpression = nestedIcus[nestedIcuIndex];
                    // Create the comment node that will anchor the ICU expression
                    addCreateNodeAndAppend(create, ICU_MARKER, ngDevMode ? `nested ICU ${nestedIcuIndex}` : '', parentIdx, newIndex);
                    icuStart(tView, lView, sharedUpdateOpCodes, parentIdx, icuExpression, newIndex);
                    addRemoveNestedIcu(remove, newIndex, depth);
                }
                break;
        }
        currentNode = currentNode.nextSibling;
    }
    return bindingMask;
}
function addRemoveNode(remove, index, depth) {
    if (depth === 0) {
        remove.push(index);
    }
}
function addRemoveNestedIcu(remove, index, depth) {
    if (depth === 0) {
        remove.push(~index); // remove ICU at `index`
        remove.push(index); // remove ICU comment at `index`
    }
}
function addUpdateIcuSwitch(update, icuExpression, index) {
    update.push(toMaskBit(icuExpression.mainBinding), 2, -1 - icuExpression.mainBinding, index << 2 /* I18nUpdateOpCode.SHIFT_REF */ | 2 /* I18nUpdateOpCode.IcuSwitch */);
}
function addUpdateIcuUpdate(update, bindingMask, index) {
    update.push(bindingMask, 1, index << 2 /* I18nUpdateOpCode.SHIFT_REF */ | 3 /* I18nUpdateOpCode.IcuUpdate */);
}
function addCreateNodeAndAppend(create, marker, text, appendToParentIdx, createAtIdx) {
    if (marker !== null) {
        create.push(marker);
    }
    create.push(text, createAtIdx, icuCreateOpCode(0 /* IcuCreateOpCode.AppendChild */, appendToParentIdx, createAtIdx));
}
function addCreateAttribute(create, newIndex, attr) {
    create.push(newIndex << 1 /* IcuCreateOpCode.SHIFT_REF */ | 1 /* IcuCreateOpCode.Attr */, attr.name, attr.value);
}
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* @license\n * Copyright Google LLC 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 '../../util/ng_dev_mode';\nimport '../../util/ng_i18n_closure_mode';\n\nimport {getTemplateContent, URI_ATTRS, VALID_ATTRS, VALID_ELEMENTS} from '../../sanitization/html_sanitizer';\nimport {getInertBodyHelper} from '../../sanitization/inert_body';\nimport {_sanitizeUrl} from '../../sanitization/url_sanitizer';\nimport {assertDefined, assertEqual, assertGreaterThanOrEqual, assertOneOf, assertString} from '../../util/assert';\nimport {CharCode} from '../../util/char_code';\nimport {loadIcuContainerVisitor} from '../instructions/i18n_icu_container_visitor';\nimport {allocExpando, createTNodeAtIndex} from '../instructions/shared';\nimport {getDocument} from '../interfaces/document';\nimport {ELEMENT_MARKER, I18nCreateOpCode, I18nCreateOpCodes, I18nRemoveOpCodes, I18nUpdateOpCode, I18nUpdateOpCodes, ICU_MARKER, IcuCreateOpCode, IcuCreateOpCodes, IcuExpression, IcuType, TI18n, TIcu} from '../interfaces/i18n';\nimport {TNode, TNodeType} from '../interfaces/node';\nimport {SanitizerFn} from '../interfaces/sanitization';\nimport {HEADER_OFFSET, LView, TView} from '../interfaces/view';\nimport {getCurrentParentTNode, getCurrentTNode, setCurrentTNode} from '../state';\nimport {attachDebugGetter} from '../util/debug_utils';\n\nimport {i18nCreateOpCodesToString, i18nRemoveOpCodesToString, i18nUpdateOpCodesToString, icuCreateOpCodesToString} from './i18n_debug';\nimport {addTNodeAndUpdateInsertBeforeIndex} from './i18n_insert_before_index';\nimport {ensureIcuContainerVisitorLoaded} from './i18n_tree_shaking';\nimport {createTNodePlaceholder, icuCreateOpCode, setTIcu, setTNodeInsertBeforeIndex} from './i18n_util';\n\n\n\nconst BINDING_REGEXP = /�(\\d+):?\\d*�/gi;\nconst ICU_REGEXP = /({\\s*�\\d+:?\\d*�\\s*,\\s*\\S{6}\\s*,[\\s\\S]*})/gi;\nconst NESTED_ICU = /�(\\d+)�/;\nconst ICU_BLOCK_REGEXP = /^\\s*(�\\d+:?\\d*�)\\s*,\\s*(select|plural)\\s*,/;\n\nconst MARKER = `�`;\nconst SUBTEMPLATE_REGEXP = /�\\/?\\*(\\d+:\\d+)�/gi;\nconst PH_REGEXP = /�(\\/?[#*]\\d+):?\\d*�/gi;\n\n/**\n * Angular Dart introduced &ngsp; as a placeholder for non-removable space, see:\n * https://github.com/dart-lang/angular/blob/0bb611387d29d65b5af7f9d2515ab571fd3fbee4/_tests/test/compiler/preserve_whitespace_test.dart#L25-L32\n * In Angular Dart &ngsp; is converted to the 0xE500 PUA (Private Use Areas) unicode character\n * and later on replaced by a space. We are re-implementing the same idea here, since translations\n * might contain this special character.\n */\nconst NGSP_UNICODE_REGEXP = /\\uE500/g;\nfunction replaceNgsp(value: string): string {\n  return value.replace(NGSP_UNICODE_REGEXP, ' ');\n}\n\n/**\n * Create dynamic nodes from i18n translation block.\n *\n * - Text nodes are created synchronously\n * - TNodes are linked into tree lazily\n *\n * @param tView Current `TView`\n * @parentTNodeIndex index to the parent TNode of this i18n block\n * @param lView Current `LView`\n * @param index Index of `ɵɵi18nStart` instruction.\n * @param message Message to translate.\n * @param subTemplateIndex Index into the sub template of message translation. (ie in case of\n *     `ngIf`) (-1 otherwise)\n */\nexport function i18nStartFirstCreatePass(\n    tView: TView, parentTNodeIndex: number, lView: LView, index: number, message: string,\n    subTemplateIndex: number) {\n  const rootTNode = getCurrentParentTNode();\n  const createOpCodes: I18nCreateOpCodes = [] as any;\n  const updateOpCodes: I18nUpdateOpCodes = [] as any;\n  const existingTNodeStack: TNode[][] = [[]];\n  if (ngDevMode) {\n    attachDebugGetter(createOpCodes, i18nCreateOpCodesToString);\n    attachDebugGetter(updateOpCodes, i18nUpdateOpCodesToString);\n  }\n\n  message = getTranslationForTemplate(message, subTemplateIndex);\n  const msgParts = replaceNgsp(message).split(PH_REGEXP);\n  for (let i = 0; i < msgParts.length; i++) {\n    let value = msgParts[i];\n    if ((i & 1) === 0) {\n      // Even indexes are text (including bindings & ICU expressions)\n      const parts = i18nParseTextIntoPartsAndICU(value);\n      for (let j = 0; j < parts.length; j++) {\n        let part = parts[j];\n        if ((j & 1) === 0) {\n          // `j` is odd therefore `part` is string\n          const text = part as string;\n          ngDevMode && assertString(text, 'Parsed ICU part should be string');\n          if (text !== '') {\n            i18nStartFirstCreatePassProcessTextNode(\n                tView, rootTNode, existingTNodeStack[0], createOpCodes, updateOpCodes, lView, text);\n          }\n        } else {\n          // `j` is Even therefor `part` is an `ICUExpression`\n          const icuExpression: IcuExpression = part as IcuExpression;\n          // Verify that ICU expression has the right shape. Translations might contain invalid\n          // constructions (while original messages were correct), so ICU parsing at runtime may\n          // not succeed (thus `icuExpression` remains a string).\n          // Note: we intentionally retain the error here by not using `ngDevMode`, because\n          // the value can change based on the locale and users aren't guaranteed to hit\n          // an invalid string while they're developing.\n          if (typeof icuExpression !== 'object') {\n            throw new Error(`Unable to parse ICU expression in \"${message}\" message.`);\n          }\n          const icuContainerTNode = createTNodeAndAddOpCode(\n              tView, rootTNode, existingTNodeStack[0], lView, createOpCodes,\n              ngDevMode ? `ICU ${index}:${icuExpression.mainBinding}` : '', true);\n          const icuNodeIndex = icuContainerTNode.index;\n          ngDevMode &&\n              assertGreaterThanOrEqual(\n                  icuNodeIndex, HEADER_OFFSET, 'Index must be in absolute LView offset');\n          icuStart(tView, lView, updateOpCodes, parentTNodeIndex, icuExpression, icuNodeIndex);\n        }\n      }\n    } else {\n      // Odd indexes are placeholders (elements and sub-templates)\n      // At this point value is something like: '/#1:2' (originally coming from '�/#1:2�')\n      const isClosing = value.charCodeAt(0) === CharCode.SLASH;\n      const type = value.charCodeAt(isClosing ? 1 : 0);\n      ngDevMode && assertOneOf(type, CharCode.STAR, CharCode.HASH);\n      const index = HEADER_OFFSET + Number.parseInt(value.substring((isClosing ? 2 : 1)));\n      if (isClosing) {\n        existingTNodeStack.shift();\n        setCurrentTNode(getCurrentParentTNode()!, false);\n      } else {\n        const tNode = createTNodePlaceholder(tView, existingTNodeStack[0], index);\n        existingTNodeStack.unshift([]);\n        setCurrentTNode(tNode, true);\n      }\n    }\n  }\n\n  tView.data[index] = <TI18n>{\n    create: createOpCodes,\n    update: updateOpCodes,\n  };\n}\n\n/**\n * Allocate space in i18n Range add create OpCode instruction to create a text or comment node.\n *\n * @param tView Current `TView` needed to allocate space in i18n range.\n * @param rootTNode Root `TNode` of the i18n block. This node determines if the new TNode will be\n *     added as part of the `i18nStart` instruction or as part of the `TNode.insertBeforeIndex`.\n * @param existingTNodes internal state for `addTNodeAndUpdateInsertBeforeIndex`.\n * @param lView Current `LView` needed to allocate space in i18n range.\n * @param createOpCodes Array storing `I18nCreateOpCodes` where new opCodes will be added.\n * @param text Text to be added when the `Text` or `Comment` node will be created.\n * @param isICU true if a `Comment` node for ICU (instead of `Text`) node should be created.\n */\nfunction createTNodeAndAddOpCode(\n    tView: TView, rootTNode: TNode|null, existingTNodes: TNode[], lView: LView,\n    createOpCodes: I18nCreateOpCodes, text: string|null, isICU: boolean): TNode {\n  const i18nNodeIdx = allocExpando(tView, lView, 1, null);\n  let opCode = i18nNodeIdx << I18nCreateOpCode.SHIFT;\n  let parentTNode = getCurrentParentTNode();\n\n  if (rootTNode === parentTNode) {\n    // FIXME(misko): A null `parentTNode` should represent when we fall of the `LView` boundary.\n    // (there is no parent), but in some circumstances (because we are inconsistent about how we set\n    // `previousOrParentTNode`) it could point to `rootTNode` So this is a work around.\n    parentTNode = null;\n  }\n  if (parentTNode === null) {\n    // If we don't have a parent that means that we can eagerly add nodes.\n    // If we have a parent than these nodes can't be added now (as the parent has not been created\n    // yet) and instead the `parentTNode` is responsible for adding it. See\n    // `TNode.insertBeforeIndex`\n    opCode |= I18nCreateOpCode.APPEND_EAGERLY;\n  }\n  if (isICU) {\n    opCode |= I18nCreateOpCode.COMMENT;\n    ensureIcuContainerVisitorLoaded(loadIcuContainerVisitor);\n  }\n  createOpCodes.push(opCode, text === null ? '' : text);\n  // We store `{{?}}` so that when looking at debug `TNodeType.template` we can see where the\n  // bindings are.\n  const tNode = createTNodeAtIndex(\n      tView, i18nNodeIdx, isICU ? TNodeType.Icu : TNodeType.Text,\n      text === null ? (ngDevMode ? '{{?}}' : '') : text, null);\n  addTNodeAndUpdateInsertBeforeIndex(existingTNodes, tNode);\n  const tNodeIdx = tNode.index;\n  setCurrentTNode(tNode, false /* Text nodes are self closing */);\n  if (parentTNode !== null && rootTNode !== parentTNode) {\n    // We are a child of deeper node (rather than a direct child of `i18nStart` instruction.)\n    // We have to make sure to add ourselves to the parent.\n    setTNodeInsertBeforeIndex(parentTNode, tNodeIdx);\n  }\n  return tNode;\n}\n\n/**\n * Processes text node in i18n block.\n *\n * Text nodes can have:\n * - Create instruction in `createOpCodes` for creating the text node.\n * - Allocate spec for text node in i18n range of `LView`\n * - If contains binding:\n *    - bindings => allocate space in i18n range of `LView` to store the binding value.\n *    - populate `updateOpCodes` with update instructions.\n *\n * @param tView Current `TView`\n * @param rootTNode Root `TNode` of the i18n block. This node determines if the new TNode will\n *     be added as part of the `i18nStart` instruction or as part of the\n *     `TNode.insertBeforeIndex`.\n * @param existingTNodes internal state for `addTNodeAndUpdateInsertBeforeIndex`.\n * @param createOpCodes Location where the creation OpCodes will be stored.\n * @param lView Current `LView`\n * @param text The translated text (which may contain binding)\n */\nfunction i18nStartFirstCreatePassProcessTextNode(\n    tView: TView, rootTNode: TNode|null, existingTNodes: TNode[], createOpCodes: I18nCreateOpCodes,\n    updateOpCodes: I18nUpdateOpCodes, lView: LView, text: string): void {\n  const hasBinding = text.match(BINDING_REGEXP);\n  const tNode = createTNodeAndAddOpCode(\n      tView, rootTNode, existingTNodes, lView, createOpCodes, hasBinding ? null : text, false);\n  if (hasBinding) {\n    generateBindingUpdateOpCodes(updateOpCodes, text, tNode.index, null, 0, null);\n  }\n}\n\n/**\n * See `i18nAttributes` above.\n */\nexport function i18nAttributesFirstPass(tView: TView, index: number, values: string[]) {\n  const previousElement = getCurrentTNode()!;\n  const previousElementIndex = previousElement.index;\n  const updateOpCodes: I18nUpdateOpCodes = [] as any;\n  if (ngDevMode) {\n    attachDebugGetter(updateOpCodes, i18nUpdateOpCodesToString);\n  }\n  if (tView.firstCreatePass && tView.data[index] === null) {\n    for (let i = 0; i < values.length; i += 2) {\n      const attrName = values[i];\n      const message = values[i + 1];\n\n      if (message !== '') {\n        // Check if attribute value contains an ICU and throw an error if that's the case.\n        // ICUs in element attributes are not supported.\n        // Note: we intentionally retain the error here by not using `ngDevMode`, because\n        // the `value` can change based on the locale and users aren't guaranteed to hit\n        // an invalid string while they're developing.\n        if (ICU_REGEXP.test(message)) {\n          throw new Error(\n              `ICU expressions are not supported in attributes. Message: \"${message}\".`);\n        }\n\n        // i18n attributes that hit this code path are guaranteed to have bindings, because\n        // the compiler treats static i18n attributes as regular attribute bindings.\n        // Since this may not be the first i18n attribute on this element we need to pass in how\n        // many previous bindings there have already been.\n        generateBindingUpdateOpCodes(\n            updateOpCodes, message, previousElementIndex, attrName, countBindings(updateOpCodes),\n            null);\n      }\n    }\n    tView.data[index] = updateOpCodes;\n  }\n}\n\n\n/**\n * Generate the OpCodes to update the bindings of a string.\n *\n * @param updateOpCodes Place where the update opcodes will be stored.\n * @param str The string containing the bindings.\n * @param destinationNode Index of the destination node which will receive the binding.\n * @param attrName Name of the attribute, if the string belongs to an attribute.\n * @param sanitizeFn Sanitization function used to sanitize the string after update, if necessary.\n * @param bindingStart The lView index of the next expression that can be bound via an opCode.\n * @returns The mask value for these bindings\n */\nfunction generateBindingUpdateOpCodes(\n    updateOpCodes: I18nUpdateOpCodes, str: string, destinationNode: number, attrName: string|null,\n    bindingStart: number, sanitizeFn: SanitizerFn|null): number {\n  ngDevMode &&\n      assertGreaterThanOrEqual(\n          destinationNode, HEADER_OFFSET, 'Index must be in absolute LView offset');\n  const maskIndex = updateOpCodes.length;  // Location of mask\n  const sizeIndex = maskIndex + 1;         // location of size for skipping\n  updateOpCodes.push(null, null);          // Alloc space for mask and size\n  const startIndex = maskIndex + 2;        // location of first allocation.\n  if (ngDevMode) {\n    attachDebugGetter(updateOpCodes, i18nUpdateOpCodesToString);\n  }\n  const textParts = str.split(BINDING_REGEXP);\n  let mask = 0;\n\n  for (let j = 0; j < textParts.length; j++) {\n    const textValue = textParts[j];\n\n    if (j & 1) {\n      // Odd indexes are bindings\n      const bindingIndex = bindingStart + parseInt(textValue, 10);\n      updateOpCodes.push(-1 - bindingIndex);\n      mask = mask | toMaskBit(bindingIndex);\n    } else if (textValue !== '') {\n      // Even indexes are text\n      updateOpCodes.push(textValue);\n    }\n  }\n\n  updateOpCodes.push(\n      destinationNode << I18nUpdateOpCode.SHIFT_REF |\n      (attrName ? I18nUpdateOpCode.Attr : I18nUpdateOpCode.Text));\n  if (attrName) {\n    updateOpCodes.push(attrName, sanitizeFn);\n  }\n  updateOpCodes[maskIndex] = mask;\n  updateOpCodes[sizeIndex] = updateOpCodes.length - startIndex;\n  return mask;\n}\n\n/**\n * Count the number of bindings in the given `opCodes`.\n *\n * It could be possible to speed this up, by passing the number of bindings found back from\n * `generateBindingUpdateOpCodes()` to `i18nAttributesFirstPass()` but this would then require more\n * complexity in the code and/or transient objects to be created.\n *\n * Since this function is only called once when the template is instantiated, is trivial in the\n * first instance (since `opCodes` will be an empty array), and it is not common for elements to\n * contain multiple i18n bound attributes, it seems like this is a reasonable compromise.\n */\nfunction countBindings(opCodes: I18nUpdateOpCodes): number {\n  let count = 0;\n  for (let i = 0; i < opCodes.length; i++) {\n    const opCode = opCodes[i];\n    // Bindings are negative numbers.\n    if (typeof opCode === 'number' && opCode < 0) {\n      count++;\n    }\n  }\n  return count;\n}\n\n/**\n * Convert binding index to mask bit.\n *\n * Each index represents a single bit on the bit-mask. Because bit-mask only has 32 bits, we make\n * the 32nd bit share all masks for all bindings higher than 32. Since it is extremely rare to\n * have more than 32 bindings this will be hit very rarely. The downside of hitting this corner\n * case is that we will execute binding code more often than necessary. (penalty of performance)\n */\nfunction toMaskBit(bindingIndex: number): number {\n  return 1 << Math.min(bindingIndex, 31);\n}\n\nexport function isRootTemplateMessage(subTemplateIndex: number): subTemplateIndex is - 1 {\n  return subTemplateIndex === -1;\n}\n\n\n/**\n * Removes everything inside the sub-templates of a message.\n */\nfunction removeInnerTemplateTranslation(message: string): string {\n  let match;\n  let res = '';\n  let index = 0;\n  let inTemplate = false;\n  let tagMatched;\n\n  while ((match = SUBTEMPLATE_REGEXP.exec(message)) !== null) {\n    if (!inTemplate) {\n      res += message.substring(index, match.index + match[0].length);\n      tagMatched = match[1];\n      inTemplate = true;\n    } else {\n      if (match[0] === `${MARKER}/*${tagMatched}${MARKER}`) {\n        index = match.index;\n        inTemplate = false;\n      }\n    }\n  }\n\n  ngDevMode &&\n      assertEqual(\n          inTemplate, false,\n          `Tag mismatch: unable to find the end of the sub-template in the translation \"${\n              message}\"`);\n\n  res += message.slice(index);\n  return res;\n}\n\n\n/**\n * Extracts a part of a message and removes the rest.\n *\n * This method is used for extracting a part of the message associated with a template. A\n * translated message can span multiple templates.\n *\n * Example:\n * ```\n * <div i18n>Translate <span *ngIf>me</span>!</div>\n * ```\n *\n * @param message The message to crop\n * @param subTemplateIndex Index of the sub-template to extract. If undefined it returns the\n * external template and removes all sub-templates.\n */\nexport function getTranslationForTemplate(message: string, subTemplateIndex: number) {\n  if (isRootTemplateMessage(subTemplateIndex)) {\n    // We want the root template message, ignore all sub-templates\n    return removeInnerTemplateTranslation(message);\n  } else {\n    // We want a specific sub-template\n    const start =\n        message.indexOf(`:${subTemplateIndex}${MARKER}`) + 2 + subTemplateIndex.toString().length;\n    const end = message.search(new RegExp(`${MARKER}\\\\/\\\\*\\\\d+:${subTemplateIndex}${MARKER}`));\n    return removeInnerTemplateTranslation(message.substring(start, end));\n  }\n}\n\n/**\n * Generate the OpCodes for ICU expressions.\n *\n * @param icuExpression\n * @param index Index where the anchor is stored and an optional `TIcuContainerNode`\n *   - `lView[anchorIdx]` points to a `Comment` node representing the anchor for the ICU.\n *   - `tView.data[anchorIdx]` points to the `TIcuContainerNode` if ICU is root (`null` otherwise)\n */\nexport function icuStart(\n    tView: TView, lView: LView, updateOpCodes: I18nUpdateOpCodes, parentIdx: number,\n    icuExpression: IcuExpression, anchorIdx: number) {\n  ngDevMode && assertDefined(icuExpression, 'ICU expression must be defined');\n  let bindingMask = 0;\n  const tIcu: TIcu = {\n    type: icuExpression.type,\n    currentCaseLViewIndex: allocExpando(tView, lView, 1, null),\n    anchorIdx,\n    cases: [],\n    create: [],\n    remove: [],\n    update: []\n  };\n  addUpdateIcuSwitch(updateOpCodes, icuExpression, anchorIdx);\n  setTIcu(tView, anchorIdx, tIcu);\n  const values = icuExpression.values;\n  for (let i = 0; i < values.length; i++) {\n    // Each value is an array of strings & other ICU expressions\n    const valueArr = values[i];\n    const nestedIcus: IcuExpression[] = [];\n    for (let j = 0; j < valueArr.length; j++) {\n      const value = valueArr[j];\n      if (typeof value !== 'string') {\n        // It is an nested ICU expression\n        const icuIndex = nestedIcus.push(value as IcuExpression) - 1;\n        // Replace nested ICU expression by a comment node\n        valueArr[j] = `<!--�${icuIndex}�-->`;\n      }\n    }\n    bindingMask = parseIcuCase(\n                      tView, tIcu, lView, updateOpCodes, parentIdx, icuExpression.cases[i],\n                      valueArr.join(''), nestedIcus) |\n        bindingMask;\n  }\n  if (bindingMask) {\n    addUpdateIcuUpdate(updateOpCodes, bindingMask, anchorIdx);\n  }\n}\n\n/**\n * Parses text containing an ICU expression and produces a JSON object for it.\n * Original code from closure library, modified for Angular.\n *\n * @param pattern Text containing an ICU expression that needs to be parsed.\n *\n */\nexport function parseICUBlock(pattern: string): IcuExpression {\n  const cases = [];\n  const values: (string|IcuExpression)[][] = [];\n  let icuType = IcuType.plural;\n  let mainBinding = 0;\n  pattern = pattern.replace(ICU_BLOCK_REGEXP, function(str: string, binding: string, type: string) {\n    if (type === 'select') {\n      icuType = IcuType.select;\n    } else {\n      icuType = IcuType.plural;\n    }\n    mainBinding = parseInt(binding.slice(1), 10);\n    return '';\n  });\n\n  const parts = i18nParseTextIntoPartsAndICU(pattern) as string[];\n  // Looking for (key block)+ sequence. One of the keys has to be \"other\".\n  for (let pos = 0; pos < parts.length;) {\n    let key = parts[pos++].trim();\n    if (icuType === IcuType.plural) {\n      // Key can be \"=x\", we just want \"x\"\n      key = key.replace(/\\s*(?:=)?(\\w+)\\s*/, '$1');\n    }\n    if (key.length) {\n      cases.push(key);\n    }\n\n    const blocks = i18nParseTextIntoPartsAndICU(parts[pos++]) as string[];\n    if (cases.length > values.length) {\n      values.push(blocks);\n    }\n  }\n\n  // TODO(ocombe): support ICU expressions in attributes, see #21615\n  return {type: icuType, mainBinding: mainBinding, cases, values};\n}\n\n\n/**\n * Breaks pattern into strings and top level {...} blocks.\n * Can be used to break a message into text and ICU expressions, or to break an ICU expression\n * into keys and cases. Original code from closure library, modified for Angular.\n *\n * @param pattern (sub)Pattern to be broken.\n * @returns An `Array<string|IcuExpression>` where:\n *   - odd positions: `string` => text between ICU expressions\n *   - even positions: `ICUExpression` => ICU expression parsed into `ICUExpression` record.\n */\nexport function i18nParseTextIntoPartsAndICU(pattern: string): (string|IcuExpression)[] {\n  if (!pattern) {\n    return [];\n  }\n\n  let prevPos = 0;\n  const braceStack = [];\n  const results: (string|IcuExpression)[] = [];\n  const braces = /[{}]/g;\n  // lastIndex doesn't get set to 0 so we have to.\n  braces.lastIndex = 0;\n\n  let match;\n  while (match = braces.exec(pattern)) {\n    const pos = match.index;\n    if (match[0] == '}') {\n      braceStack.pop();\n\n      if (braceStack.length == 0) {\n        // End of the block.\n        const block = pattern.substring(prevPos, pos);\n        if (ICU_BLOCK_REGEXP.test(block)) {\n          results.push(parseICUBlock(block));\n        } else {\n          results.push(block);\n        }\n\n        prevPos = pos + 1;\n      }\n    } else {\n      if (braceStack.length == 0) {\n        const substring = pattern.substring(prevPos, pos);\n        results.push(substring);\n        prevPos = pos + 1;\n      }\n      braceStack.push('{');\n    }\n  }\n\n  const substring = pattern.substring(prevPos);\n  results.push(substring);\n  return results;\n}\n\n\n/**\n * Parses a node, its children and its siblings, and generates the mutate & update OpCodes.\n *\n */\nexport function parseIcuCase(\n    tView: TView, tIcu: TIcu, lView: LView, updateOpCodes: I18nUpdateOpCodes, parentIdx: number,\n    caseName: string, unsafeCaseHtml: string, nestedIcus: IcuExpression[]): number {\n  const create: IcuCreateOpCodes = [] as any;\n  const remove: I18nRemoveOpCodes = [] as any;\n  const update: I18nUpdateOpCodes = [] as any;\n  if (ngDevMode) {\n    attachDebugGetter(create, icuCreateOpCodesToString);\n    attachDebugGetter(remove, i18nRemoveOpCodesToString);\n    attachDebugGetter(update, i18nUpdateOpCodesToString);\n  }\n  tIcu.cases.push(caseName);\n  tIcu.create.push(create);\n  tIcu.remove.push(remove);\n  tIcu.update.push(update);\n\n  const inertBodyHelper = getInertBodyHelper(getDocument());\n  const inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeCaseHtml);\n  ngDevMode && assertDefined(inertBodyElement, 'Unable to generate inert body element');\n  const inertRootNode = getTemplateContent(inertBodyElement!) as Element || inertBodyElement;\n  if (inertRootNode) {\n    return walkIcuTree(\n        tView, tIcu, lView, updateOpCodes, create, remove, update, inertRootNode, parentIdx,\n        nestedIcus, 0);\n  } else {\n    return 0;\n  }\n}\n\nfunction walkIcuTree(\n    tView: TView, tIcu: TIcu, lView: LView, sharedUpdateOpCodes: I18nUpdateOpCodes,\n    create: IcuCreateOpCodes, remove: I18nRemoveOpCodes, update: I18nUpdateOpCodes,\n    parentNode: Element, parentIdx: number, nestedIcus: IcuExpression[], depth: number): number {\n  let bindingMask = 0;\n  let currentNode = parentNode.firstChild;\n  while (currentNode) {\n    const newIndex = allocExpando(tView, lView, 1, null);\n    switch (currentNode.nodeType) {\n      case Node.ELEMENT_NODE:\n        const element = currentNode as Element;\n        const tagName = element.tagName.toLowerCase();\n        if (VALID_ELEMENTS.hasOwnProperty(tagName)) {\n          addCreateNodeAndAppend(create, ELEMENT_MARKER, tagName, parentIdx, newIndex);\n          tView.data[newIndex] = tagName;\n          const elAttrs = element.attributes;\n          for (let i = 0; i < elAttrs.length; i++) {\n            const attr = elAttrs.item(i)!;\n            const lowerAttrName = attr.name.toLowerCase();\n            const hasBinding = !!attr.value.match(BINDING_REGEXP);\n            // we assume the input string is safe, unless it's using a binding\n            if (hasBinding) {\n              if (VALID_ATTRS.hasOwnProperty(lowerAttrName)) {\n                if (URI_ATTRS[lowerAttrName]) {\n                  generateBindingUpdateOpCodes(\n                      update, attr.value, newIndex, attr.name, 0, _sanitizeUrl);\n                } else {\n                  generateBindingUpdateOpCodes(update, attr.value, newIndex, attr.name, 0, null);\n                }\n              } else {\n                ngDevMode &&\n                    console.warn(\n                        `WARNING: ignoring unsafe attribute value ` +\n                        `${lowerAttrName} on element ${tagName} ` +\n                        `(see https://g.co/ng/security#xss)`);\n              }\n            } else {\n              addCreateAttribute(create, newIndex, attr);\n            }\n          }\n          // Parse the children of this node (if any)\n          bindingMask = walkIcuTree(\n                            tView, tIcu, lView, sharedUpdateOpCodes, create, remove, update,\n                            currentNode as Element, newIndex, nestedIcus, depth + 1) |\n              bindingMask;\n          addRemoveNode(remove, newIndex, depth);\n        }\n        break;\n      case Node.TEXT_NODE:\n        const value = currentNode.textContent || '';\n        const hasBinding = value.match(BINDING_REGEXP);\n        addCreateNodeAndAppend(create, null, hasBinding ? '' : value, parentIdx, newIndex);\n        addRemoveNode(remove, newIndex, depth);\n        if (hasBinding) {\n          bindingMask =\n              generateBindingUpdateOpCodes(update, value, newIndex, null, 0, null) | bindingMask;\n        }\n        break;\n      case Node.COMMENT_NODE:\n        // Check if the comment node is a placeholder for a nested ICU\n        const isNestedIcu = NESTED_ICU.exec(currentNode.textContent || '');\n        if (isNestedIcu) {\n          const nestedIcuIndex = parseInt(isNestedIcu[1], 10);\n          const icuExpression: IcuExpression = nestedIcus[nestedIcuIndex];\n          // Create the comment node that will anchor the ICU expression\n          addCreateNodeAndAppend(\n              create, ICU_MARKER, ngDevMode ? `nested ICU ${nestedIcuIndex}` : '', parentIdx,\n              newIndex);\n          icuStart(tView, lView, sharedUpdateOpCodes, parentIdx, icuExpression, newIndex);\n          addRemoveNestedIcu(remove, newIndex, depth);\n        }\n        break;\n    }\n    currentNode = currentNode.nextSibling;\n  }\n  return bindingMask;\n}\n\nfunction addRemoveNode(remove: I18nRemoveOpCodes, index: number, depth: number) {\n  if (depth === 0) {\n    remove.push(index);\n  }\n}\n\nfunction addRemoveNestedIcu(remove: I18nRemoveOpCodes, index: number, depth: number) {\n  if (depth === 0) {\n    remove.push(~index);  // remove ICU at `index`\n    remove.push(index);   // remove ICU comment at `index`\n  }\n}\n\nfunction addUpdateIcuSwitch(\n    update: I18nUpdateOpCodes, icuExpression: IcuExpression, index: number) {\n  update.push(\n      toMaskBit(icuExpression.mainBinding), 2, -1 - icuExpression.mainBinding,\n      index << I18nUpdateOpCode.SHIFT_REF | I18nUpdateOpCode.IcuSwitch);\n}\n\nfunction addUpdateIcuUpdate(update: I18nUpdateOpCodes, bindingMask: number, index: number) {\n  update.push(bindingMask, 1, index << I18nUpdateOpCode.SHIFT_REF | I18nUpdateOpCode.IcuUpdate);\n}\n\nfunction addCreateNodeAndAppend(\n    create: IcuCreateOpCodes, marker: null|ICU_MARKER|ELEMENT_MARKER, text: string,\n    appendToParentIdx: number, createAtIdx: number) {\n  if (marker !== null) {\n    create.push(marker);\n  }\n  create.push(\n      text, createAtIdx,\n      icuCreateOpCode(IcuCreateOpCode.AppendChild, appendToParentIdx, createAtIdx));\n}\n\nfunction addCreateAttribute(create: IcuCreateOpCodes, newIndex: number, attr: Attr) {\n  create.push(newIndex << IcuCreateOpCode.SHIFT_REF | IcuCreateOpCode.Attr, attr.name, attr.value);\n}\n"]}