132 lines
3.9 KiB
C#
132 lines
3.9 KiB
C#
/*
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* dbMango
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*
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* Copyright 2025 Deutsche Bank AG
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace Rms.Risk.Mango.Language.Ast;
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public class AstStageProject : AstStage
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{
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public AstStageProject() {}
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public AstStageProject(IEnumerable<AstLet> id, IEnumerable<AstLet> fields, bool exclude = false)
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{
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_id.AddRange(id);
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Exclude = exclude;
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foreach (var field in fields.OfType<AstNodeBase>())
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Add(field);
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}
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public void AddId(AstLet field)
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{
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_id.Add(field);
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}
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private List<AstLet> _id = [];
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public IReadOnlyList<AstLet> IdFields => _id;
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public IReadOnlyList<AstLet> Fields => Children.OfType<AstLet>().ToList();
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public bool Exclude { get; internal set; }
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public override void Append(StringBuilder sb, int indent)
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{
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bool first;
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if ( Exclude || IdFields.Count == 0)
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sb.AppendLine($"{Spaces(indent)}PROJECT{(Exclude ? " EXCLUDE" : "")}");
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else
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{
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sb.AppendLine($"{Spaces(indent)}PROJECT ID {{");
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first = true;
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foreach (var field in IdFields)
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{
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if ( !first )
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sb.AppendLine(",");
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else
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first = false;
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field.Append(sb, indent + 2);
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}
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sb.AppendLine();
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sb.AppendLine($"{Spaces(indent+1)}}}");
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}
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first = true;
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foreach (var field in Fields)
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{
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if ( !first )
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sb.AppendLine(",");
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else
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first = false;
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if ( field is AstLetExpression let)
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{
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if ( (let.Expression is AstExpressionVariable ev) && string.IsNullOrWhiteSpace(let.Name))
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{
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sb.Append($"{Spaces(indent + 1)}");
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ev.Append(sb, indent + 1);
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}
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else
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let.Append(sb, indent + 1);
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}
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else
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field.Append(sb, indent + 1);
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}
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sb.AppendLine();
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}
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public override JsonNode? AsJson()
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{
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var fields = new JsonObject();
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if ( IdFields.Count > 0 )
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{
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var idFields = new JsonObject();
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foreach (var field in IdFields)
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{
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if ( field is AstLetExpression let)
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AddFields(let, idFields);
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}
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fields.Add("_id", idFields);
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}
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foreach (var field in Fields)
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{
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if ( field is AstLetExpression let)
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AddFields(let, fields);
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}
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var stage = new JsonObject([ new("$project", fields)]);
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return ApplyOptions(stage);
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}
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private void AddFields(AstLetExpression field, JsonObject fields)
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{
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var name = field.Name;
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if ( string.IsNullOrWhiteSpace(name) )
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name = (field.Expression as AstExpressionVariable)?.Name;
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if ( string.IsNullOrWhiteSpace(name) )
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throw new ($"{field.Expression} must have a name");
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if ( (field.Expression is AstExpressionVariable ev) && string.IsNullOrWhiteSpace(field.Name))
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fields.Add(ev.Name, JsonValue.Create(Exclude ? 0 : 1));
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else
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fields.Add(name, field.Expression.AsJson());
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}
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}
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