"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const of_1 = require("rxjs/observable/of");
const operators_1 = require("rxjs/operators");
const filtered_1 = require("../tree/filtered");
const interface_1 = require("../tree/interface");
const static_1 = require("../tree/static");
const virtual_1 = require("../tree/virtual");
const call_1 = require("./call");
/**
 * A Source that returns an tree as its single value.
 */
function source(tree) {
    return () => tree;
}
exports.source = source;
/**
 * A source that returns an empty tree.
 */
function empty() {
    return () => static_1.empty();
}
exports.empty = empty;
/**
 * Chain multiple rules into a single rule.
 */
function chain(rules) {
    return (tree, context) => {
        return rules.reduce((acc, curr) => {
            return call_1.callRule(curr, acc, context);
        }, of_1.of(tree));
    };
}
exports.chain = chain;
/**
 * Apply multiple rules to a source, and returns the source transformed.
 */
function apply(source, rules) {
    return (context) => {
        return call_1.callRule(chain(rules), call_1.callSource(source, context), context);
    };
}
exports.apply = apply;
/**
 * Merge an input tree with the source passed in.
 */
function mergeWith(source, strategy = interface_1.MergeStrategy.Default) {
    return (tree, context) => {
        const result = call_1.callSource(source, context);
        return result.pipe(operators_1.map(other => virtual_1.VirtualTree.merge(tree, other, strategy || context.strategy)));
    };
}
exports.mergeWith = mergeWith;
function noop() {
    return (tree, _context) => tree;
}
exports.noop = noop;
function filter(predicate) {
    return (tree) => new filtered_1.FilteredTree(tree, predicate);
}
exports.filter = filter;
function asSource(rule) {
    return apply(empty(), [rule]);
}
exports.asSource = asSource;
function branchAndMerge(rule, strategy = interface_1.MergeStrategy.Default) {
    return (tree, context) => {
        const branchedTree = static_1.branch(tree);
        return call_1.callRule(rule, of_1.of(branchedTree), context)
            .pipe(operators_1.map(t => static_1.merge(tree, t, strategy)));
    };
}
exports.branchAndMerge = branchAndMerge;
function when(predicate, operator) {
    return (entry) => {
        if (predicate(entry.path, entry)) {
            return operator(entry);
        }
        else {
            return entry;
        }
    };
}
exports.when = when;
function partitionApplyMerge(predicate, ruleYes, ruleNo) {
    return (tree, context) => {
        const [yes, no] = static_1.partition(tree, predicate);
        if (!ruleNo) {
            // Shortcut.
            return call_1.callRule(ruleYes, of_1.of(static_1.partition(tree, predicate)[0]), context)
                .pipe(operators_1.map(yesTree => static_1.merge(yesTree, no, context.strategy)));
        }
        return call_1.callRule(ruleYes, of_1.of(yes), context)
            .pipe(operators_1.concatMap(yesTree => {
            return call_1.callRule(ruleNo, of_1.of(no), context)
                .pipe(operators_1.map(noTree => static_1.merge(yesTree, noTree, context.strategy)));
        }));
    };
}
exports.partitionApplyMerge = partitionApplyMerge;
function forEach(operator) {
    return (tree) => {
        tree.visit((path, entry) => {
            if (!entry) {
                return;
            }
            const newEntry = operator(entry);
            if (newEntry === entry) {
                return;
            }
            if (newEntry === null) {
                tree.delete(path);
                return;
            }
            if (newEntry.path != path) {
                tree.rename(path, newEntry.path);
            }
            if (!newEntry.content.equals(entry.content)) {
                tree.overwrite(newEntry.path, newEntry.content);
            }
        });
        return tree;
    };
}
exports.forEach = forEach;
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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 { Observable } from 'rxjs/Observable';\nimport { of as observableOf } from 'rxjs/observable/of';\nimport { concatMap, map } from 'rxjs/operators';\nimport { FileOperator, Rule, SchematicContext, Source } from '../engine/interface';\nimport { FilteredTree } from '../tree/filtered';\nimport { FileEntry, FilePredicate, MergeStrategy, Tree } from '../tree/interface';\nimport {\n  branch,\n  empty as staticEmpty,\n  merge as staticMerge,\n  partition as staticPartition,\n} from '../tree/static';\nimport { VirtualTree } from '../tree/virtual';\nimport { callRule, callSource } from './call';\n\n\n/**\n * A Source that returns an tree as its single value.\n */\nexport function source(tree: Tree): Source {\n  return () => tree;\n}\n\n\n/**\n * A source that returns an empty tree.\n */\nexport function empty(): Source {\n  return () => staticEmpty();\n}\n\n\n/**\n * Chain multiple rules into a single rule.\n */\nexport function chain(rules: Rule[]): Rule {\n  return (tree: Tree, context: SchematicContext) => {\n    return rules.reduce((acc: Observable<Tree>, curr: Rule) => {\n      return callRule(curr, acc, context);\n    }, observableOf(tree));\n  };\n}\n\n\n/**\n * Apply multiple rules to a source, and returns the source transformed.\n */\nexport function apply(source: Source, rules: Rule[]): Source {\n  return (context: SchematicContext) => {\n    return callRule(chain(rules), callSource(source, context), context);\n  };\n}\n\n\n/**\n * Merge an input tree with the source passed in.\n */\nexport function mergeWith(source: Source, strategy: MergeStrategy = MergeStrategy.Default): Rule {\n  return (tree: Tree, context: SchematicContext) => {\n    const result = callSource(source, context);\n\n    return result.pipe(map(other => VirtualTree.merge(tree, other, strategy || context.strategy)));\n  };\n}\n\n\nexport function noop(): Rule {\n  return (tree: Tree, _context: SchematicContext) => tree;\n}\n\n\nexport function filter(predicate: FilePredicate<boolean>): Rule {\n  return (tree: Tree) => new FilteredTree(tree, predicate);\n}\n\n\nexport function asSource(rule: Rule): Source {\n  return apply(empty(), [rule]);\n}\n\n\nexport function branchAndMerge(rule: Rule, strategy = MergeStrategy.Default): Rule {\n  return (tree: Tree, context: SchematicContext) => {\n    const branchedTree = branch(tree);\n\n    return callRule(rule, observableOf(branchedTree), context)\n      .pipe(map(t => staticMerge(tree, t, strategy)));\n  };\n}\n\n\nexport function when(predicate: FilePredicate<boolean>, operator: FileOperator): FileOperator {\n  return (entry: FileEntry) => {\n    if (predicate(entry.path, entry)) {\n      return operator(entry);\n    } else {\n      return entry;\n    }\n  };\n}\n\n\nexport function partitionApplyMerge(\n  predicate: FilePredicate<boolean>,\n  ruleYes: Rule,\n  ruleNo?: Rule,\n): Rule {\n  return (tree: Tree, context: SchematicContext) => {\n    const [yes, no] = staticPartition(tree, predicate);\n\n    if (!ruleNo) {\n      // Shortcut.\n      return callRule(ruleYes, observableOf(staticPartition(tree, predicate)[0]), context)\n        .pipe(map(yesTree => staticMerge(yesTree, no, context.strategy)));\n    }\n\n    return callRule(ruleYes, observableOf(yes), context)\n      .pipe(concatMap(yesTree => {\n        return callRule(ruleNo, observableOf(no), context)\n          .pipe(map(noTree => staticMerge(yesTree, noTree, context.strategy)));\n      }));\n  };\n}\n\n\nexport function forEach(operator: FileOperator): Rule {\n  return (tree: Tree) => {\n    tree.visit((path, entry) => {\n      if (!entry) {\n        return;\n      }\n      const newEntry = operator(entry);\n      if (newEntry === entry) {\n        return;\n      }\n      if (newEntry === null) {\n        tree.delete(path);\n\n        return;\n      }\n      if (newEntry.path != path) {\n        tree.rename(path, newEntry.path);\n      }\n      if (!newEntry.content.equals(entry.content)) {\n        tree.overwrite(newEntry.path, newEntry.content);\n      }\n    });\n\n    return tree;\n  };\n}\n"]}