@angular/core/esm2020/src/render3/instructions/i18n.mjs

Angular - the core framework

/**
 * @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 { assertDefined } from '../../util/assert';
import { bindingUpdated } from '../bindings';
import { applyCreateOpCodes, applyI18n, setMaskBit } from '../i18n/i18n_apply';
import { i18nAttributesFirstPass, i18nStartFirstCreatePass } from '../i18n/i18n_parse';
import { i18nPostprocess } from '../i18n/i18n_postprocess';
import { HEADER_OFFSET, T_HOST } from '../interfaces/view';
import { getClosestRElement } from '../node_manipulation';
import { getCurrentParentTNode, getLView, getTView, nextBindingIndex, setInI18nBlock } from '../state';
import { getConstant } from '../util/view_utils';
/**
 * Marks a block of text as translatable.
 *
 * The instructions `i18nStart` and `i18nEnd` mark the translation block in the template.
 * The translation `message` is the value which is locale specific. The translation string may
 * contain placeholders which associate inner elements and sub-templates within the translation.
 *
 * The translation `message` placeholders are:
 * - `�{index}(:{block})�`: *Binding Placeholder*: Marks a location where an expression will be
 *   interpolated into. The placeholder `index` points to the expression binding index. An optional
 *   `block` that matches the sub-template in which it was declared.
 * - `�#{index}(:{block})�`/`�/#{index}(:{block})�`: *Element Placeholder*:  Marks the beginning
 *   and end of DOM element that were embedded in the original translation block. The placeholder
 *   `index` points to the element index in the template instructions set. An optional `block` that
 *   matches the sub-template in which it was declared.
 * - `�*{index}:{block}�`/`�/*{index}:{block}�`: *Sub-template Placeholder*: Sub-templates must be
 *   split up and translated separately in each angular template function. The `index` points to the
 *   `template` instruction index. A `block` that matches the sub-template in which it was declared.
 *
 * @param index A unique index of the translation in the static block.
 * @param messageIndex An index of the translation message from the `def.consts` array.
 * @param subTemplateIndex Optional sub-template index in the `message`.
 *
 * @codeGenApi
 */
export function ɵɵi18nStart(index, messageIndex, subTemplateIndex = -1) {
    const tView = getTView();
    const lView = getLView();
    const adjustedIndex = HEADER_OFFSET + index;
    ngDevMode && assertDefined(tView, `tView should be defined`);
    const message = getConstant(tView.consts, messageIndex);
    const parentTNode = getCurrentParentTNode();
    if (tView.firstCreatePass) {
        i18nStartFirstCreatePass(tView, parentTNode === null ? 0 : parentTNode.index, lView, adjustedIndex, message, subTemplateIndex);
    }
    const tI18n = tView.data[adjustedIndex];
    const sameViewParentTNode = parentTNode === lView[T_HOST] ? null : parentTNode;
    const parentRNode = getClosestRElement(tView, sameViewParentTNode, lView);
    // If `parentTNode` is an `ElementContainer` than it has `<!--ng-container--->`.
    // When we do inserts we have to make sure to insert in front of `<!--ng-container--->`.
    const insertInFrontOf = parentTNode && (parentTNode.type & 8 /* TNodeType.ElementContainer */) ?
        lView[parentTNode.index] :
        null;
    applyCreateOpCodes(lView, tI18n.create, parentRNode, insertInFrontOf);
    setInI18nBlock(true);
}
/**
 * Translates a translation block marked by `i18nStart` and `i18nEnd`. It inserts the text/ICU nodes
 * into the render tree, moves the placeholder nodes and removes the deleted nodes.
 *
 * @codeGenApi
 */
export function ɵɵi18nEnd() {
    setInI18nBlock(false);
}
/**
 *
 * Use this instruction to create a translation block that doesn't contain any placeholder.
 * It calls both {@link i18nStart} and {@link i18nEnd} in one instruction.
 *
 * The translation `message` is the value which is locale specific. The translation string may
 * contain placeholders which associate inner elements and sub-templates within the translation.
 *
 * The translation `message` placeholders are:
 * - `�{index}(:{block})�`: *Binding Placeholder*: Marks a location where an expression will be
 *   interpolated into. The placeholder `index` points to the expression binding index. An optional
 *   `block` that matches the sub-template in which it was declared.
 * - `�#{index}(:{block})�`/`�/#{index}(:{block})�`: *Element Placeholder*:  Marks the beginning
 *   and end of DOM element that were embedded in the original translation block. The placeholder
 *   `index` points to the element index in the template instructions set. An optional `block` that
 *   matches the sub-template in which it was declared.
 * - `�*{index}:{block}�`/`�/*{index}:{block}�`: *Sub-template Placeholder*: Sub-templates must be
 *   split up and translated separately in each angular template function. The `index` points to the
 *   `template` instruction index. A `block` that matches the sub-template in which it was declared.
 *
 * @param index A unique index of the translation in the static block.
 * @param messageIndex An index of the translation message from the `def.consts` array.
 * @param subTemplateIndex Optional sub-template index in the `message`.
 *
 * @codeGenApi
 */
export function ɵɵi18n(index, messageIndex, subTemplateIndex) {
    ɵɵi18nStart(index, messageIndex, subTemplateIndex);
    ɵɵi18nEnd();
}
/**
 * Marks a list of attributes as translatable.
 *
 * @param index A unique index in the static block
 * @param values
 *
 * @codeGenApi
 */
export function ɵɵi18nAttributes(index, attrsIndex) {
    const tView = getTView();
    ngDevMode && assertDefined(tView, `tView should be defined`);
    const attrs = getConstant(tView.consts, attrsIndex);
    i18nAttributesFirstPass(tView, index + HEADER_OFFSET, attrs);
}
/**
 * Stores the values of the bindings during each update cycle in order to determine if we need to
 * update the translated nodes.
 *
 * @param value The binding's value
 * @returns This function returns itself so that it may be chained
 * (e.g. `i18nExp(ctx.name)(ctx.title)`)
 *
 * @codeGenApi
 */
export function ɵɵi18nExp(value) {
    const lView = getLView();
    setMaskBit(bindingUpdated(lView, nextBindingIndex(), value));
    return ɵɵi18nExp;
}
/**
 * Updates a translation block or an i18n attribute when the bindings have changed.
 *
 * @param index Index of either {@link i18nStart} (translation block) or {@link i18nAttributes}
 * (i18n attribute) on which it should update the content.
 *
 * @codeGenApi
 */
export function ɵɵi18nApply(index) {
    applyI18n(getTView(), getLView(), index + HEADER_OFFSET);
}
/**
 * Handles message string post-processing for internationalization.
 *
 * Handles message string post-processing by transforming it from intermediate
 * format (that might contain some markers that we need to replace) to the final
 * form, consumable by i18nStart instruction. Post processing steps include:
 *
 * 1. Resolve all multi-value cases (like [�*1:1��#2:1�|�#4:1�|�5�])
 * 2. Replace all ICU vars (like "VAR_PLURAL")
 * 3. Replace all placeholders used inside ICUs in a form of {PLACEHOLDER}
 * 4. Replace all ICU references with corresponding values (like �ICU_EXP_ICU_1�)
 *    in case multiple ICUs have the same placeholder name
 *
 * @param message Raw translation string for post processing
 * @param replacements Set of replacements that should be applied
 *
 * @returns Transformed string that can be consumed by i18nStart instruction
 *
 * @codeGenApi
 */
export function ɵɵi18nPostprocess(message, replacements = {}) {
    return i18nPostprocess(message, replacements);
}
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The translation string may\n * contain placeholders which associate inner elements and sub-templates within the translation.\n *\n * The translation `message` placeholders are:\n * - `�{index}(:{block})�`: *Binding Placeholder*: Marks a location where an expression will be\n *   interpolated into. The placeholder `index` points to the expression binding index. An optional\n *   `block` that matches the sub-template in which it was declared.\n * - `�#{index}(:{block})�`/`�/#{index}(:{block})�`: *Element Placeholder*:  Marks the beginning\n *   and end of DOM element that were embedded in the original translation block. The placeholder\n *   `index` points to the element index in the template instructions set. An optional `block` that\n *   matches the sub-template in which it was declared.\n * - `�*{index}:{block}�`/`�/*{index}:{block}�`: *Sub-template Placeholder*: Sub-templates must be\n *   split up and translated separately in each angular template function. The `index` points to the\n *   `template` instruction index. A `block` that matches the sub-template in which it was declared.\n *\n * @param index A unique index of the translation in the static block.\n * @param messageIndex An index of the translation message from the `def.consts` array.\n * @param subTemplateIndex Optional sub-template index in the `message`.\n *\n * @codeGenApi\n */\nexport function ɵɵi18nStart(\n    index: number, messageIndex: number, subTemplateIndex: number = -1): void {\n  const tView = getTView();\n  const lView = getLView();\n  const adjustedIndex = HEADER_OFFSET + index;\n  ngDevMode && assertDefined(tView, `tView should be defined`);\n  const message = getConstant<string>(tView.consts, messageIndex)!;\n  const parentTNode = getCurrentParentTNode() as TElementNode | null;\n  if (tView.firstCreatePass) {\n    i18nStartFirstCreatePass(\n        tView, parentTNode === null ? 0 : parentTNode.index, lView, adjustedIndex, message,\n        subTemplateIndex);\n  }\n  const tI18n = tView.data[adjustedIndex] as TI18n;\n  const sameViewParentTNode = parentTNode === lView[T_HOST] ? null : parentTNode;\n  const parentRNode = getClosestRElement(tView, sameViewParentTNode, lView);\n  // If `parentTNode` is an `ElementContainer` than it has `<!--ng-container--->`.\n  // When we do inserts we have to make sure to insert in front of `<!--ng-container--->`.\n  const insertInFrontOf = parentTNode && (parentTNode.type & TNodeType.ElementContainer) ?\n      lView[parentTNode.index] :\n      null;\n  applyCreateOpCodes(lView, tI18n.create, parentRNode, insertInFrontOf);\n  setInI18nBlock(true);\n}\n\n\n\n/**\n * Translates a translation block marked by `i18nStart` and `i18nEnd`. It inserts the text/ICU nodes\n * into the render tree, moves the placeholder nodes and removes the deleted nodes.\n *\n * @codeGenApi\n */\nexport function ɵɵi18nEnd(): void {\n  setInI18nBlock(false);\n}\n\n/**\n *\n * Use this instruction to create a translation block that doesn't contain any placeholder.\n * It calls both {@link i18nStart} and {@link i18nEnd} in one instruction.\n *\n * The translation `message` is the value which is locale specific. The translation string may\n * contain placeholders which associate inner elements and sub-templates within the translation.\n *\n * The translation `message` placeholders are:\n * - `�{index}(:{block})�`: *Binding Placeholder*: Marks a location where an expression will be\n *   interpolated into. The placeholder `index` points to the expression binding index. An optional\n *   `block` that matches the sub-template in which it was declared.\n * - `�#{index}(:{block})�`/`�/#{index}(:{block})�`: *Element Placeholder*:  Marks the beginning\n *   and end of DOM element that were embedded in the original translation block. The placeholder\n *   `index` points to the element index in the template instructions set. An optional `block` that\n *   matches the sub-template in which it was declared.\n * - `�*{index}:{block}�`/`�/*{index}:{block}�`: *Sub-template Placeholder*: Sub-templates must be\n *   split up and translated separately in each angular template function. The `index` points to the\n *   `template` instruction index. A `block` that matches the sub-template in which it was declared.\n *\n * @param index A unique index of the translation in the static block.\n * @param messageIndex An index of the translation message from the `def.consts` array.\n * @param subTemplateIndex Optional sub-template index in the `message`.\n *\n * @codeGenApi\n */\nexport function ɵɵi18n(index: number, messageIndex: number, subTemplateIndex?: number): void {\n  ɵɵi18nStart(index, messageIndex, subTemplateIndex);\n  ɵɵi18nEnd();\n}\n\n/**\n * Marks a list of attributes as translatable.\n *\n * @param index A unique index in the static block\n * @param values\n *\n * @codeGenApi\n */\nexport function ɵɵi18nAttributes(index: number, attrsIndex: number): void {\n  const tView = getTView();\n  ngDevMode && assertDefined(tView, `tView should be defined`);\n  const attrs = getConstant<string[]>(tView.consts, attrsIndex)!;\n  i18nAttributesFirstPass(tView, index + HEADER_OFFSET, attrs);\n}\n\n\n/**\n * Stores the values of the bindings during each update cycle in order to determine if we need to\n * update the translated nodes.\n *\n * @param value The binding's value\n * @returns This function returns itself so that it may be chained\n * (e.g. `i18nExp(ctx.name)(ctx.title)`)\n *\n * @codeGenApi\n */\nexport function ɵɵi18nExp<T>(value: T): typeof ɵɵi18nExp {\n  const lView = getLView();\n  setMaskBit(bindingUpdated(lView, nextBindingIndex(), value));\n  return ɵɵi18nExp;\n}\n\n/**\n * Updates a translation block or an i18n attribute when the bindings have changed.\n *\n * @param index Index of either {@link i18nStart} (translation block) or {@link i18nAttributes}\n * (i18n attribute) on which it should update the content.\n *\n * @codeGenApi\n */\nexport function ɵɵi18nApply(index: number) {\n  applyI18n(getTView(), getLView(), index + HEADER_OFFSET);\n}\n\n/**\n * Handles message string post-processing for internationalization.\n *\n * Handles message string post-processing by transforming it from intermediate\n * format (that might contain some markers that we need to replace) to the final\n * form, consumable by i18nStart instruction. Post processing steps include:\n *\n * 1. Resolve all multi-value cases (like [�*1:1��#2:1�|�#4:1�|�5�])\n * 2. Replace all ICU vars (like \"VAR_PLURAL\")\n * 3. Replace all placeholders used inside ICUs in a form of {PLACEHOLDER}\n * 4. Replace all ICU references with corresponding values (like �ICU_EXP_ICU_1�)\n *    in case multiple ICUs have the same placeholder name\n *\n * @param message Raw translation string for post processing\n * @param replacements Set of replacements that should be applied\n *\n * @returns Transformed string that can be consumed by i18nStart instruction\n *\n * @codeGenApi\n */\nexport function ɵɵi18nPostprocess(\n    message: string, replacements: {[key: string]: (string|string[])} = {}): string {\n  return i18nPostprocess(message, replacements);\n}\n"]}