/**
 * @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 * as html from '../ml_parser/ast';
import { ParseError } from '../parse_util';
import * as t from './r3_ast';
import { getTriggerParametersStart, parseDeferredTime, parseOnTrigger, parseWhenTrigger } from './r3_deferred_triggers';
/** Pattern to identify a `prefetch when` trigger. */
const PREFETCH_WHEN_PATTERN = /^prefetch\s+when\s/;
/** Pattern to identify a `prefetch on` trigger. */
const PREFETCH_ON_PATTERN = /^prefetch\s+on\s/;
/** Pattern to identify a `minimum` parameter in a block. */
const MINIMUM_PARAMETER_PATTERN = /^minimum\s/;
/** Pattern to identify a `after` parameter in a block. */
const AFTER_PARAMETER_PATTERN = /^after\s/;
/** Pattern to identify a `when` parameter in a block. */
const WHEN_PARAMETER_PATTERN = /^when\s/;
/** Pattern to identify a `on` parameter in a block. */
const ON_PARAMETER_PATTERN = /^on\s/;
/** Possible types of secondary deferred blocks. */
export var SecondaryDeferredBlockType;
(function (SecondaryDeferredBlockType) {
    SecondaryDeferredBlockType["PLACEHOLDER"] = "placeholder";
    SecondaryDeferredBlockType["LOADING"] = "loading";
    SecondaryDeferredBlockType["ERROR"] = "error";
})(SecondaryDeferredBlockType || (SecondaryDeferredBlockType = {}));
/** Creates a deferred block from an HTML AST node. */
export function createDeferredBlock(ast, visitor, bindingParser) {
    const errors = [];
    const [primaryBlock, ...secondaryBlocks] = ast.blocks;
    const { triggers, prefetchTriggers } = parsePrimaryTriggers(primaryBlock.parameters, bindingParser, errors);
    const { placeholder, loading, error } = parseSecondaryBlocks(secondaryBlocks, errors, visitor);
    return {
        node: new t.DeferredBlock(html.visitAll(visitor, primaryBlock.children), triggers, prefetchTriggers, placeholder, loading, error, ast.sourceSpan, ast.startSourceSpan, ast.endSourceSpan),
        errors,
    };
}
function parseSecondaryBlocks(blocks, errors, visitor) {
    let placeholder = null;
    let loading = null;
    let error = null;
    for (const block of blocks) {
        try {
            switch (block.name) {
                case SecondaryDeferredBlockType.PLACEHOLDER:
                    if (placeholder !== null) {
                        errors.push(new ParseError(block.startSourceSpan, `"defer" block can only have one "${SecondaryDeferredBlockType.PLACEHOLDER}" block`));
                    }
                    else {
                        placeholder = parsePlaceholderBlock(block, visitor);
                    }
                    break;
                case SecondaryDeferredBlockType.LOADING:
                    if (loading !== null) {
                        errors.push(new ParseError(block.startSourceSpan, `"defer" block can only have one "${SecondaryDeferredBlockType.LOADING}" block`));
                    }
                    else {
                        loading = parseLoadingBlock(block, visitor);
                    }
                    break;
                case SecondaryDeferredBlockType.ERROR:
                    if (error !== null) {
                        errors.push(new ParseError(block.startSourceSpan, `"defer" block can only have one "${SecondaryDeferredBlockType.ERROR}" block`));
                    }
                    else {
                        error = parseErrorBlock(block, visitor);
                    }
                    break;
                default:
                    errors.push(new ParseError(block.startSourceSpan, `Unrecognized block "${block.name}"`));
                    break;
            }
        }
        catch (e) {
            errors.push(new ParseError(block.startSourceSpan, e.message));
        }
    }
    return { placeholder, loading, error };
}
function parsePlaceholderBlock(ast, visitor) {
    let minimumTime = null;
    for (const param of ast.parameters) {
        if (MINIMUM_PARAMETER_PATTERN.test(param.expression)) {
            const parsedTime = parseDeferredTime(param.expression.slice(getTriggerParametersStart(param.expression)));
            if (parsedTime === null) {
                throw new Error(`Could not parse time value of parameter "minimum"`);
            }
            minimumTime = parsedTime;
        }
        else {
            throw new Error(`Unrecognized parameter in "${SecondaryDeferredBlockType.PLACEHOLDER}" block: "${param.expression}"`);
        }
    }
    return new t.DeferredBlockPlaceholder(html.visitAll(visitor, ast.children), minimumTime, ast.sourceSpan, ast.startSourceSpan, ast.endSourceSpan);
}
function parseLoadingBlock(ast, visitor) {
    let afterTime = null;
    let minimumTime = null;
    for (const param of ast.parameters) {
        if (AFTER_PARAMETER_PATTERN.test(param.expression)) {
            const parsedTime = parseDeferredTime(param.expression.slice(getTriggerParametersStart(param.expression)));
            if (parsedTime === null) {
                throw new Error(`Could not parse time value of parameter "after"`);
            }
            afterTime = parsedTime;
        }
        else if (MINIMUM_PARAMETER_PATTERN.test(param.expression)) {
            const parsedTime = parseDeferredTime(param.expression.slice(getTriggerParametersStart(param.expression)));
            if (parsedTime === null) {
                throw new Error(`Could not parse time value of parameter "minimum"`);
            }
            minimumTime = parsedTime;
        }
        else {
            throw new Error(`Unrecognized parameter in "${SecondaryDeferredBlockType.LOADING}" block: "${param.expression}"`);
        }
    }
    return new t.DeferredBlockLoading(html.visitAll(visitor, ast.children), afterTime, minimumTime, ast.sourceSpan, ast.startSourceSpan, ast.endSourceSpan);
}
function parseErrorBlock(ast, visitor) {
    if (ast.parameters.length > 0) {
        throw new Error(`"${SecondaryDeferredBlockType.ERROR}" block cannot have parameters`);
    }
    return new t.DeferredBlockError(html.visitAll(visitor, ast.children), ast.sourceSpan, ast.startSourceSpan, ast.endSourceSpan);
}
function parsePrimaryTriggers(params, bindingParser, errors) {
    const triggers = [];
    const prefetchTriggers = [];
    for (const param of params) {
        // The lexer ignores the leading spaces so we can assume
        // that the expression starts with a keyword.
        if (WHEN_PARAMETER_PATTERN.test(param.expression)) {
            const result = parseWhenTrigger(param, bindingParser, errors);
            result !== null && triggers.push(result);
        }
        else if (ON_PARAMETER_PATTERN.test(param.expression)) {
            triggers.push(...parseOnTrigger(param, errors));
        }
        else if (PREFETCH_WHEN_PATTERN.test(param.expression)) {
            const result = parseWhenTrigger(param, bindingParser, errors);
            result !== null && prefetchTriggers.push(result);
        }
        else if (PREFETCH_ON_PATTERN.test(param.expression)) {
            prefetchTriggers.push(...parseOnTrigger(param, errors));
        }
        else {
            errors.push(new ParseError(param.sourceSpan, 'Unrecognized trigger'));
        }
    }
    return { triggers, prefetchTriggers };
}
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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 * as html from '../ml_parser/ast';\nimport {ParseError} from '../parse_util';\nimport {BindingParser} from '../template_parser/binding_parser';\n\nimport * as t from './r3_ast';\nimport {getTriggerParametersStart, parseDeferredTime, parseOnTrigger, parseWhenTrigger} from './r3_deferred_triggers';\n\n/** Pattern to identify a `prefetch when` trigger. */\nconst PREFETCH_WHEN_PATTERN = /^prefetch\\s+when\\s/;\n\n/** Pattern to identify a `prefetch on` trigger. */\nconst PREFETCH_ON_PATTERN = /^prefetch\\s+on\\s/;\n\n/** Pattern to identify a `minimum` parameter in a block. */\nconst MINIMUM_PARAMETER_PATTERN = /^minimum\\s/;\n\n/** Pattern to identify a `after` parameter in a block. */\nconst AFTER_PARAMETER_PATTERN = /^after\\s/;\n\n/** Pattern to identify a `when` parameter in a block. */\nconst WHEN_PARAMETER_PATTERN = /^when\\s/;\n\n/** Pattern to identify a `on` parameter in a block. */\nconst ON_PARAMETER_PATTERN = /^on\\s/;\n\n/** Possible types of secondary deferred blocks. */\nexport enum SecondaryDeferredBlockType {\n  PLACEHOLDER = 'placeholder',\n  LOADING = 'loading',\n  ERROR = 'error',\n}\n\n/** Creates a deferred block from an HTML AST node. */\nexport function createDeferredBlock(\n    ast: html.BlockGroup, visitor: html.Visitor,\n    bindingParser: BindingParser): {node: t.DeferredBlock, errors: ParseError[]} {\n  const errors: ParseError[] = [];\n  const [primaryBlock, ...secondaryBlocks] = ast.blocks;\n  const {triggers, prefetchTriggers} =\n      parsePrimaryTriggers(primaryBlock.parameters, bindingParser, errors);\n  const {placeholder, loading, error} = parseSecondaryBlocks(secondaryBlocks, errors, visitor);\n\n  return {\n    node: new t.DeferredBlock(\n        html.visitAll(visitor, primaryBlock.children), triggers, prefetchTriggers, placeholder,\n        loading, error, ast.sourceSpan, ast.startSourceSpan, ast.endSourceSpan),\n    errors,\n  };\n}\n\nfunction parseSecondaryBlocks(blocks: html.Block[], errors: ParseError[], visitor: html.Visitor) {\n  let placeholder: t.DeferredBlockPlaceholder|null = null;\n  let loading: t.DeferredBlockLoading|null = null;\n  let error: t.DeferredBlockError|null = null;\n\n  for (const block of blocks) {\n    try {\n      switch (block.name) {\n        case SecondaryDeferredBlockType.PLACEHOLDER:\n          if (placeholder !== null) {\n            errors.push(new ParseError(\n                block.startSourceSpan,\n                `\"defer\" block can only have one \"${\n                    SecondaryDeferredBlockType.PLACEHOLDER}\" block`));\n          } else {\n            placeholder = parsePlaceholderBlock(block, visitor);\n          }\n          break;\n\n        case SecondaryDeferredBlockType.LOADING:\n          if (loading !== null) {\n            errors.push(new ParseError(\n                block.startSourceSpan,\n                `\"defer\" block can only have one \"${SecondaryDeferredBlockType.LOADING}\" block`));\n          } else {\n            loading = parseLoadingBlock(block, visitor);\n          }\n          break;\n\n        case SecondaryDeferredBlockType.ERROR:\n          if (error !== null) {\n            errors.push(new ParseError(\n                block.startSourceSpan,\n                `\"defer\" block can only have one \"${SecondaryDeferredBlockType.ERROR}\" block`));\n          } else {\n            error = parseErrorBlock(block, visitor);\n          }\n          break;\n\n        default:\n          errors.push(new ParseError(block.startSourceSpan, `Unrecognized block \"${block.name}\"`));\n          break;\n      }\n    } catch (e) {\n      errors.push(new ParseError(block.startSourceSpan, (e as Error).message));\n    }\n  }\n\n  return {placeholder, loading, error};\n}\n\nfunction parsePlaceholderBlock(ast: html.Block, visitor: html.Visitor): t.DeferredBlockPlaceholder {\n  let minimumTime: number|null = null;\n\n  for (const param of ast.parameters) {\n    if (MINIMUM_PARAMETER_PATTERN.test(param.expression)) {\n      const parsedTime =\n          parseDeferredTime(param.expression.slice(getTriggerParametersStart(param.expression)));\n\n      if (parsedTime === null) {\n        throw new Error(`Could not parse time value of parameter \"minimum\"`);\n      }\n\n      minimumTime = parsedTime;\n    } else {\n      throw new Error(`Unrecognized parameter in \"${\n          SecondaryDeferredBlockType.PLACEHOLDER}\" block: \"${param.expression}\"`);\n    }\n  }\n\n  return new t.DeferredBlockPlaceholder(\n      html.visitAll(visitor, ast.children), minimumTime, ast.sourceSpan, ast.startSourceSpan,\n      ast.endSourceSpan);\n}\n\nfunction parseLoadingBlock(ast: html.Block, visitor: html.Visitor): t.DeferredBlockLoading {\n  let afterTime: number|null = null;\n  let minimumTime: number|null = null;\n\n  for (const param of ast.parameters) {\n    if (AFTER_PARAMETER_PATTERN.test(param.expression)) {\n      const parsedTime =\n          parseDeferredTime(param.expression.slice(getTriggerParametersStart(param.expression)));\n\n      if (parsedTime === null) {\n        throw new Error(`Could not parse time value of parameter \"after\"`);\n      }\n\n      afterTime = parsedTime;\n    } else if (MINIMUM_PARAMETER_PATTERN.test(param.expression)) {\n      const parsedTime =\n          parseDeferredTime(param.expression.slice(getTriggerParametersStart(param.expression)));\n\n      if (parsedTime === null) {\n        throw new Error(`Could not parse time value of parameter \"minimum\"`);\n      }\n\n      minimumTime = parsedTime;\n    } else {\n      throw new Error(`Unrecognized parameter in \"${SecondaryDeferredBlockType.LOADING}\" block: \"${\n          param.expression}\"`);\n    }\n  }\n\n  return new t.DeferredBlockLoading(\n      html.visitAll(visitor, ast.children), afterTime, minimumTime, ast.sourceSpan,\n      ast.startSourceSpan, ast.endSourceSpan);\n}\n\n\nfunction parseErrorBlock(ast: html.Block, visitor: html.Visitor): t.DeferredBlockError {\n  if (ast.parameters.length > 0) {\n    throw new Error(`\"${SecondaryDeferredBlockType.ERROR}\" block cannot have parameters`);\n  }\n\n  return new t.DeferredBlockError(\n      html.visitAll(visitor, ast.children), ast.sourceSpan, ast.startSourceSpan, ast.endSourceSpan);\n}\n\nfunction parsePrimaryTriggers(\n    params: html.BlockParameter[], bindingParser: BindingParser, errors: ParseError[]) {\n  const triggers: t.DeferredTrigger[] = [];\n  const prefetchTriggers: t.DeferredTrigger[] = [];\n\n  for (const param of params) {\n    // The lexer ignores the leading spaces so we can assume\n    // that the expression starts with a keyword.\n    if (WHEN_PARAMETER_PATTERN.test(param.expression)) {\n      const result = parseWhenTrigger(param, bindingParser, errors);\n      result !== null && triggers.push(result);\n    } else if (ON_PARAMETER_PATTERN.test(param.expression)) {\n      triggers.push(...parseOnTrigger(param, errors));\n    } else if (PREFETCH_WHEN_PATTERN.test(param.expression)) {\n      const result = parseWhenTrigger(param, bindingParser, errors);\n      result !== null && prefetchTriggers.push(result);\n    } else if (PREFETCH_ON_PATTERN.test(param.expression)) {\n      prefetchTriggers.push(...parseOnTrigger(param, errors));\n    } else {\n      errors.push(new ParseError(param.sourceSpan, 'Unrecognized trigger'));\n    }\n  }\n\n  return {triggers, prefetchTriggers};\n}\n"]}