/**
 * @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 { Lexer as ExpressionLexer } from '../expression_parser/lexer';
import { Parser as ExpressionParser } from '../expression_parser/parser';
import * as html from '../ml_parser/ast';
import { getHtmlTagDefinition } from '../ml_parser/html_tags';
import { ParseSourceSpan } from '../parse_util';
import * as i18n from './i18n_ast';
import { PlaceholderRegistry } from './serializers/placeholder';
const _expParser = new ExpressionParser(new ExpressionLexer());
/**
 * Returns a function converting html nodes to an i18n Message given an interpolationConfig
 */
export function createI18nMessageFactory(interpolationConfig) {
    const visitor = new _I18nVisitor(_expParser, interpolationConfig);
    return (nodes, meaning, description, customId, visitNodeFn) => visitor.toI18nMessage(nodes, meaning, description, customId, visitNodeFn);
}
function noopVisitNodeFn(_html, i18n) {
    return i18n;
}
class _I18nVisitor {
    constructor(_expressionParser, _interpolationConfig) {
        this._expressionParser = _expressionParser;
        this._interpolationConfig = _interpolationConfig;
    }
    toI18nMessage(nodes, meaning = '', description = '', customId = '', visitNodeFn) {
        const context = {
            isIcu: nodes.length == 1 && nodes[0] instanceof html.Expansion,
            icuDepth: 0,
            placeholderRegistry: new PlaceholderRegistry(),
            placeholderToContent: {},
            placeholderToMessage: {},
            visitNodeFn: visitNodeFn || noopVisitNodeFn,
        };
        const i18nodes = html.visitAll(this, nodes, context);
        return new i18n.Message(i18nodes, context.placeholderToContent, context.placeholderToMessage, meaning, description, customId);
    }
    visitElement(el, context) {
        const children = html.visitAll(this, el.children, context);
        const attrs = {};
        el.attrs.forEach(attr => {
            // Do not visit the attributes, translatable ones are top-level ASTs
            attrs[attr.name] = attr.value;
        });
        const isVoid = getHtmlTagDefinition(el.name).isVoid;
        const startPhName = context.placeholderRegistry.getStartTagPlaceholderName(el.name, attrs, isVoid);
        context.placeholderToContent[startPhName] = {
            text: el.startSourceSpan.toString(),
            sourceSpan: el.startSourceSpan,
        };
        let closePhName = '';
        if (!isVoid) {
            closePhName = context.placeholderRegistry.getCloseTagPlaceholderName(el.name);
            context.placeholderToContent[closePhName] = {
                text: `</${el.name}>`,
                sourceSpan: el.endSourceSpan ?? el.sourceSpan,
            };
        }
        const node = new i18n.TagPlaceholder(el.name, attrs, startPhName, closePhName, children, isVoid, el.sourceSpan, el.startSourceSpan, el.endSourceSpan);
        return context.visitNodeFn(el, node);
    }
    visitAttribute(attribute, context) {
        const node = attribute.valueTokens === undefined || attribute.valueTokens.length === 1 ?
            new i18n.Text(attribute.value, attribute.valueSpan || attribute.sourceSpan) :
            this._visitTextWithInterpolation(attribute.valueTokens, attribute.valueSpan || attribute.sourceSpan, context, attribute.i18n);
        return context.visitNodeFn(attribute, node);
    }
    visitText(text, context) {
        const node = text.tokens.length === 1 ?
            new i18n.Text(text.value, text.sourceSpan) :
            this._visitTextWithInterpolation(text.tokens, text.sourceSpan, context, text.i18n);
        return context.visitNodeFn(text, node);
    }
    visitComment(comment, context) {
        return null;
    }
    visitExpansion(icu, context) {
        context.icuDepth++;
        const i18nIcuCases = {};
        const i18nIcu = new i18n.Icu(icu.switchValue, icu.type, i18nIcuCases, icu.sourceSpan);
        icu.cases.forEach((caze) => {
            i18nIcuCases[caze.value] = new i18n.Container(caze.expression.map((node) => node.visit(this, context)), caze.expSourceSpan);
        });
        context.icuDepth--;
        if (context.isIcu || context.icuDepth > 0) {
            // Returns an ICU node when:
            // - the message (vs a part of the message) is an ICU message, or
            // - the ICU message is nested.
            const expPh = context.placeholderRegistry.getUniquePlaceholder(`VAR_${icu.type}`);
            i18nIcu.expressionPlaceholder = expPh;
            context.placeholderToContent[expPh] = {
                text: icu.switchValue,
                sourceSpan: icu.switchValueSourceSpan,
            };
            return context.visitNodeFn(icu, i18nIcu);
        }
        // Else returns a placeholder
        // ICU placeholders should not be replaced with their original content but with the their
        // translations.
        // TODO(vicb): add a html.Node -> i18n.Message cache to avoid having to re-create the msg
        const phName = context.placeholderRegistry.getPlaceholderName('ICU', icu.sourceSpan.toString());
        context.placeholderToMessage[phName] = this.toI18nMessage([icu], '', '', '', undefined);
        const node = new i18n.IcuPlaceholder(i18nIcu, phName, icu.sourceSpan);
        return context.visitNodeFn(icu, node);
    }
    visitExpansionCase(_icuCase, _context) {
        throw new Error('Unreachable code');
    }
    visitBlockGroup(group, context) {
        const children = html.visitAll(this, group.blocks, context);
        const node = new i18n.Container(children, group.sourceSpan);
        return context.visitNodeFn(group, node);
    }
    visitBlock(block, context) {
        const children = html.visitAll(this, block.children, context);
        const node = new i18n.Container(children, block.sourceSpan);
        return context.visitNodeFn(block, node);
    }
    visitBlockParameter(_parameter, _context) { }
    /**
     * Convert, text and interpolated tokens up into text and placeholder pieces.
     *
     * @param tokens The text and interpolated tokens.
     * @param sourceSpan The span of the whole of the `text` string.
     * @param context The current context of the visitor, used to compute and store placeholders.
     * @param previousI18n Any i18n metadata associated with this `text` from a previous pass.
     */
    _visitTextWithInterpolation(tokens, sourceSpan, context, previousI18n) {
        // Return a sequence of `Text` and `Placeholder` nodes grouped in a `Container`.
        const nodes = [];
        // We will only create a container if there are actually interpolations,
        // so this flag tracks that.
        let hasInterpolation = false;
        for (const token of tokens) {
            switch (token.type) {
                case 8 /* TokenType.INTERPOLATION */:
                case 17 /* TokenType.ATTR_VALUE_INTERPOLATION */:
                    hasInterpolation = true;
                    const expression = token.parts[1];
                    const baseName = extractPlaceholderName(expression) || 'INTERPOLATION';
                    const phName = context.placeholderRegistry.getPlaceholderName(baseName, expression);
                    context.placeholderToContent[phName] = {
                        text: token.parts.join(''),
                        sourceSpan: token.sourceSpan
                    };
                    nodes.push(new i18n.Placeholder(expression, phName, token.sourceSpan));
                    break;
                default:
                    if (token.parts[0].length > 0) {
                        // This token is text or an encoded entity.
                        // If it is following on from a previous text node then merge it into that node
                        // Otherwise, if it is following an interpolation, then add a new node.
                        const previous = nodes[nodes.length - 1];
                        if (previous instanceof i18n.Text) {
                            previous.value += token.parts[0];
                            previous.sourceSpan = new ParseSourceSpan(previous.sourceSpan.start, token.sourceSpan.end, previous.sourceSpan.fullStart, previous.sourceSpan.details);
                        }
                        else {
                            nodes.push(new i18n.Text(token.parts[0], token.sourceSpan));
                        }
                    }
                    break;
            }
        }
        if (hasInterpolation) {
            // Whitespace removal may have invalidated the interpolation source-spans.
            reusePreviousSourceSpans(nodes, previousI18n);
            return new i18n.Container(nodes, sourceSpan);
        }
        else {
            return nodes[0];
        }
    }
}
/**
 * Re-use the source-spans from `previousI18n` metadata for the `nodes`.
 *
 * Whitespace removal can invalidate the source-spans of interpolation nodes, so we
 * reuse the source-span stored from a previous pass before the whitespace was removed.
 *
 * @param nodes The `Text` and `Placeholder` nodes to be processed.
 * @param previousI18n Any i18n metadata for these `nodes` stored from a previous pass.
 */
function reusePreviousSourceSpans(nodes, previousI18n) {
    if (previousI18n instanceof i18n.Message) {
        // The `previousI18n` is an i18n `Message`, so we are processing an `Attribute` with i18n
        // metadata. The `Message` should consist only of a single `Container` that contains the
        // parts (`Text` and `Placeholder`) to process.
        assertSingleContainerMessage(previousI18n);
        previousI18n = previousI18n.nodes[0];
    }
    if (previousI18n instanceof i18n.Container) {
        // The `previousI18n` is a `Container`, which means that this is a second i18n extraction pass
        // after whitespace has been removed from the AST nodes.
        assertEquivalentNodes(previousI18n.children, nodes);
        // Reuse the source-spans from the first pass.
        for (let i = 0; i < nodes.length; i++) {
            nodes[i].sourceSpan = previousI18n.children[i].sourceSpan;
        }
    }
}
/**
 * Asserts that the `message` contains exactly one `Container` node.
 */
function assertSingleContainerMessage(message) {
    const nodes = message.nodes;
    if (nodes.length !== 1 || !(nodes[0] instanceof i18n.Container)) {
        throw new Error('Unexpected previous i18n message - expected it to consist of only a single `Container` node.');
    }
}
/**
 * Asserts that the `previousNodes` and `node` collections have the same number of elements and
 * corresponding elements have the same node type.
 */
function assertEquivalentNodes(previousNodes, nodes) {
    if (previousNodes.length !== nodes.length) {
        throw new Error('The number of i18n message children changed between first and second pass.');
    }
    if (previousNodes.some((node, i) => nodes[i].constructor !== node.constructor)) {
        throw new Error('The types of the i18n message children changed between first and second pass.');
    }
}
const _CUSTOM_PH_EXP = /\/\/[\s\S]*i18n[\s\S]*\([\s\S]*ph[\s\S]*=[\s\S]*("|')([\s\S]*?)\1[\s\S]*\)/g;
function extractPlaceholderName(input) {
    return input.split(_CUSTOM_PH_EXP)[2];
}
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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 */\n\nimport {Lexer as ExpressionLexer} from '../expression_parser/lexer';\nimport {Parser as ExpressionParser} from '../expression_parser/parser';\nimport * as html from '../ml_parser/ast';\nimport {getHtmlTagDefinition} from '../ml_parser/html_tags';\nimport {InterpolationConfig} from '../ml_parser/interpolation_config';\nimport {InterpolatedAttributeToken, InterpolatedTextToken, TokenType} from '../ml_parser/tokens';\nimport {ParseSourceSpan} from '../parse_util';\n\nimport * as i18n from './i18n_ast';\nimport {PlaceholderRegistry} from './serializers/placeholder';\n\nconst _expParser = new ExpressionParser(new ExpressionLexer());\n\nexport type VisitNodeFn = (html: html.Node, i18n: i18n.Node) => i18n.Node;\n\nexport interface I18nMessageFactory {\n  (nodes: html.Node[], meaning: string|undefined, description: string|undefined,\n   customId: string|undefined, visitNodeFn?: VisitNodeFn): i18n.Message;\n}\n\n/**\n * Returns a function converting html nodes to an i18n Message given an interpolationConfig\n */\nexport function createI18nMessageFactory(interpolationConfig: InterpolationConfig):\n    I18nMessageFactory {\n  const visitor = new _I18nVisitor(_expParser, interpolationConfig);\n  return (nodes, meaning, description, customId, visitNodeFn) =>\n             visitor.toI18nMessage(nodes, meaning, description, customId, visitNodeFn);\n}\n\ninterface I18nMessageVisitorContext {\n  isIcu: boolean;\n  icuDepth: number;\n  placeholderRegistry: PlaceholderRegistry;\n  placeholderToContent: {[phName: string]: i18n.MessagePlaceholder};\n  placeholderToMessage: {[phName: string]: i18n.Message};\n  visitNodeFn: VisitNodeFn;\n}\n\nfunction noopVisitNodeFn(_html: html.Node, i18n: i18n.Node): i18n.Node {\n  return i18n;\n}\n\nclass _I18nVisitor implements html.Visitor {\n  constructor(\n      private _expressionParser: ExpressionParser,\n      private _interpolationConfig: InterpolationConfig) {}\n\n  public toI18nMessage(\n      nodes: html.Node[], meaning = '', description = '', customId = '',\n      visitNodeFn: VisitNodeFn|undefined): i18n.Message {\n    const context: I18nMessageVisitorContext = {\n      isIcu: nodes.length == 1 && nodes[0] instanceof html.Expansion,\n      icuDepth: 0,\n      placeholderRegistry: new PlaceholderRegistry(),\n      placeholderToContent: {},\n      placeholderToMessage: {},\n      visitNodeFn: visitNodeFn || noopVisitNodeFn,\n    };\n\n    const i18nodes: i18n.Node[] = html.visitAll(this, nodes, context);\n\n    return new i18n.Message(\n        i18nodes, context.placeholderToContent, context.placeholderToMessage, meaning, description,\n        customId);\n  }\n\n  visitElement(el: html.Element, context: I18nMessageVisitorContext): i18n.Node {\n    const children = html.visitAll(this, el.children, context);\n    const attrs: {[k: string]: string} = {};\n    el.attrs.forEach(attr => {\n      // Do not visit the attributes, translatable ones are top-level ASTs\n      attrs[attr.name] = attr.value;\n    });\n\n    const isVoid: boolean = getHtmlTagDefinition(el.name).isVoid;\n    const startPhName =\n        context.placeholderRegistry.getStartTagPlaceholderName(el.name, attrs, isVoid);\n    context.placeholderToContent[startPhName] = {\n      text: el.startSourceSpan.toString(),\n      sourceSpan: el.startSourceSpan,\n    };\n\n    let closePhName = '';\n\n    if (!isVoid) {\n      closePhName = context.placeholderRegistry.getCloseTagPlaceholderName(el.name);\n      context.placeholderToContent[closePhName] = {\n        text: `</${el.name}>`,\n        sourceSpan: el.endSourceSpan ?? el.sourceSpan,\n      };\n    }\n\n    const node = new i18n.TagPlaceholder(\n        el.name, attrs, startPhName, closePhName, children, isVoid, el.sourceSpan,\n        el.startSourceSpan, el.endSourceSpan);\n    return context.visitNodeFn(el, node);\n  }\n\n  visitAttribute(attribute: html.Attribute, context: I18nMessageVisitorContext): i18n.Node {\n    const node = attribute.valueTokens === undefined || attribute.valueTokens.length === 1 ?\n        new i18n.Text(attribute.value, attribute.valueSpan || attribute.sourceSpan) :\n        this._visitTextWithInterpolation(\n            attribute.valueTokens, attribute.valueSpan || attribute.sourceSpan, context,\n            attribute.i18n);\n    return context.visitNodeFn(attribute, node);\n  }\n\n  visitText(text: html.Text, context: I18nMessageVisitorContext): i18n.Node {\n    const node = text.tokens.length === 1 ?\n        new i18n.Text(text.value, text.sourceSpan) :\n        this._visitTextWithInterpolation(text.tokens, text.sourceSpan, context, text.i18n);\n    return context.visitNodeFn(text, node);\n  }\n\n  visitComment(comment: html.Comment, context: I18nMessageVisitorContext): i18n.Node|null {\n    return null;\n  }\n\n  visitExpansion(icu: html.Expansion, context: I18nMessageVisitorContext): i18n.Node {\n    context.icuDepth++;\n    const i18nIcuCases: {[k: string]: i18n.Node} = {};\n    const i18nIcu = new i18n.Icu(icu.switchValue, icu.type, i18nIcuCases, icu.sourceSpan);\n    icu.cases.forEach((caze): void => {\n      i18nIcuCases[caze.value] = new i18n.Container(\n          caze.expression.map((node) => node.visit(this, context)), caze.expSourceSpan);\n    });\n    context.icuDepth--;\n\n    if (context.isIcu || context.icuDepth > 0) {\n      // Returns an ICU node when:\n      // - the message (vs a part of the message) is an ICU message, or\n      // - the ICU message is nested.\n      const expPh = context.placeholderRegistry.getUniquePlaceholder(`VAR_${icu.type}`);\n      i18nIcu.expressionPlaceholder = expPh;\n      context.placeholderToContent[expPh] = {\n        text: icu.switchValue,\n        sourceSpan: icu.switchValueSourceSpan,\n      };\n      return context.visitNodeFn(icu, i18nIcu);\n    }\n\n    // Else returns a placeholder\n    // ICU placeholders should not be replaced with their original content but with the their\n    // translations.\n    // TODO(vicb): add a html.Node -> i18n.Message cache to avoid having to re-create the msg\n    const phName = context.placeholderRegistry.getPlaceholderName('ICU', icu.sourceSpan.toString());\n    context.placeholderToMessage[phName] = this.toI18nMessage([icu], '', '', '', undefined);\n    const node = new i18n.IcuPlaceholder(i18nIcu, phName, icu.sourceSpan);\n    return context.visitNodeFn(icu, node);\n  }\n\n  visitExpansionCase(_icuCase: html.ExpansionCase, _context: I18nMessageVisitorContext): i18n.Node {\n    throw new Error('Unreachable code');\n  }\n\n  visitBlockGroup(group: html.BlockGroup, context: I18nMessageVisitorContext) {\n    const children = html.visitAll(this, group.blocks, context);\n    const node = new i18n.Container(children, group.sourceSpan);\n    return context.visitNodeFn(group, node);\n  }\n\n  visitBlock(block: html.Block, context: I18nMessageVisitorContext) {\n    const children = html.visitAll(this, block.children, context);\n    const node = new i18n.Container(children, block.sourceSpan);\n    return context.visitNodeFn(block, node);\n  }\n\n  visitBlockParameter(_parameter: html.BlockParameter, _context: I18nMessageVisitorContext) {}\n\n  /**\n   * Convert, text and interpolated tokens up into text and placeholder pieces.\n   *\n   * @param tokens The text and interpolated tokens.\n   * @param sourceSpan The span of the whole of the `text` string.\n   * @param context The current context of the visitor, used to compute and store placeholders.\n   * @param previousI18n Any i18n metadata associated with this `text` from a previous pass.\n   */\n  private _visitTextWithInterpolation(\n      tokens: (InterpolatedTextToken|InterpolatedAttributeToken)[], sourceSpan: ParseSourceSpan,\n      context: I18nMessageVisitorContext, previousI18n: i18n.I18nMeta|undefined): i18n.Node {\n    // Return a sequence of `Text` and `Placeholder` nodes grouped in a `Container`.\n    const nodes: i18n.Node[] = [];\n    // We will only create a container if there are actually interpolations,\n    // so this flag tracks that.\n    let hasInterpolation = false;\n    for (const token of tokens) {\n      switch (token.type) {\n        case TokenType.INTERPOLATION:\n        case TokenType.ATTR_VALUE_INTERPOLATION:\n          hasInterpolation = true;\n          const expression = token.parts[1];\n          const baseName = extractPlaceholderName(expression) || 'INTERPOLATION';\n          const phName = context.placeholderRegistry.getPlaceholderName(baseName, expression);\n          context.placeholderToContent[phName] = {\n            text: token.parts.join(''),\n            sourceSpan: token.sourceSpan\n          };\n          nodes.push(new i18n.Placeholder(expression, phName, token.sourceSpan));\n          break;\n        default:\n          if (token.parts[0].length > 0) {\n            // This token is text or an encoded entity.\n            // If it is following on from a previous text node then merge it into that node\n            // Otherwise, if it is following an interpolation, then add a new node.\n            const previous = nodes[nodes.length - 1];\n            if (previous instanceof i18n.Text) {\n              previous.value += token.parts[0];\n              previous.sourceSpan = new ParseSourceSpan(\n                  previous.sourceSpan.start, token.sourceSpan.end, previous.sourceSpan.fullStart,\n                  previous.sourceSpan.details);\n            } else {\n              nodes.push(new i18n.Text(token.parts[0], token.sourceSpan));\n            }\n          }\n          break;\n      }\n    }\n\n    if (hasInterpolation) {\n      // Whitespace removal may have invalidated the interpolation source-spans.\n      reusePreviousSourceSpans(nodes, previousI18n);\n      return new i18n.Container(nodes, sourceSpan);\n    } else {\n      return nodes[0];\n    }\n  }\n}\n\n/**\n * Re-use the source-spans from `previousI18n` metadata for the `nodes`.\n *\n * Whitespace removal can invalidate the source-spans of interpolation nodes, so we\n * reuse the source-span stored from a previous pass before the whitespace was removed.\n *\n * @param nodes The `Text` and `Placeholder` nodes to be processed.\n * @param previousI18n Any i18n metadata for these `nodes` stored from a previous pass.\n */\nfunction reusePreviousSourceSpans(nodes: i18n.Node[], previousI18n: i18n.I18nMeta|undefined): void {\n  if (previousI18n instanceof i18n.Message) {\n    // The `previousI18n` is an i18n `Message`, so we are processing an `Attribute` with i18n\n    // metadata. The `Message` should consist only of a single `Container` that contains the\n    // parts (`Text` and `Placeholder`) to process.\n    assertSingleContainerMessage(previousI18n);\n    previousI18n = previousI18n.nodes[0];\n  }\n\n  if (previousI18n instanceof i18n.Container) {\n    // The `previousI18n` is a `Container`, which means that this is a second i18n extraction pass\n    // after whitespace has been removed from the AST nodes.\n    assertEquivalentNodes(previousI18n.children, nodes);\n\n    // Reuse the source-spans from the first pass.\n    for (let i = 0; i < nodes.length; i++) {\n      nodes[i].sourceSpan = previousI18n.children[i].sourceSpan;\n    }\n  }\n}\n\n/**\n * Asserts that the `message` contains exactly one `Container` node.\n */\nfunction assertSingleContainerMessage(message: i18n.Message): void {\n  const nodes = message.nodes;\n  if (nodes.length !== 1 || !(nodes[0] instanceof i18n.Container)) {\n    throw new Error(\n        'Unexpected previous i18n message - expected it to consist of only a single `Container` node.');\n  }\n}\n\n/**\n * Asserts that the `previousNodes` and `node` collections have the same number of elements and\n * corresponding elements have the same node type.\n */\nfunction assertEquivalentNodes(previousNodes: i18n.Node[], nodes: i18n.Node[]): void {\n  if (previousNodes.length !== nodes.length) {\n    throw new Error('The number of i18n message children changed between first and second pass.');\n  }\n  if (previousNodes.some((node, i) => nodes[i].constructor !== node.constructor)) {\n    throw new Error(\n        'The types of the i18n message children changed between first and second pass.');\n  }\n}\n\nconst _CUSTOM_PH_EXP =\n    /\\/\\/[\\s\\S]*i18n[\\s\\S]*\\([\\s\\S]*ph[\\s\\S]*=[\\s\\S]*(\"|')([\\s\\S]*?)\\1[\\s\\S]*\\)/g;\n\nfunction extractPlaceholderName(input: string): string {\n  return input.split(_CUSTOM_PH_EXP)[2];\n}\n"]}