database structure

lib/snippets/database/classes/Column.ts

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+import { ColumnType } from './ColumnType';
+import { Relation } from './Relation';
+
+export class Column {
+  public name: string;
+  public type: ColumnType;
+  public relation?: Relation;
+
+  public constructor (name: string, type: ColumnType) {
+    this.name = name;
+    this.type = type;
+  }
+}

lib/snippets/database/classes/ColumnType.ts

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+export enum ColumnType {
+  string = 'string',
+  text = 'text',
+  integer = 'integer',
+  big_integer = 'bigInteger',
+  float = 'float',
+  decimal = 'decimal',
+  increments = 'increments',
+  big_increments = 'bigIncrements',
+  boolean = 'boolean',
+  date = 'date',
+  date_time ='datetime',
+  time = 'time',
+  timestamp = 'timestamp',
+  binary = 'binary',
+  enum = 'enu',
+  json='json',
+  jsonb='jsonb',
+  uuid='uuid'
+}

lib/snippets/database/classes/Database.ts

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+import { Table } from './Table';
+
+export class Database {
+  public tables: Array<Table> = [];
+}

lib/snippets/database/classes/PatchActions.ts

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+export enum PatchActions {
+  rename_column = 'rc',
+  add_column = 'ac',
+  drop_column = 'dc',
+  add_relation = 'ar',
+  drop_relation = 'dr',
+  set_column_type = 'tc',
+  add_table = 'at',
+  drop_table = 'dt',
+  rename_table = 'rt',
+  insert_data = 'id',
+  update_data = 'ud',
+  mutate_data = 'md',
+  delete_data = 'dd'
+}

lib/snippets/database/classes/Relation.ts

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+export class Relation {
+  public column: string;
+  public table: string;
+
+  public constructor (table: string, column: string) {
+    this.column = column;
+    this.table = table;
+  }
+}

lib/snippets/database/classes/Serializable.ts

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+export interface Serializable {
+  serialize(): string;
+}

lib/snippets/database/classes/Table.ts

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+import { Column } from './Column';
+
+export class Table {
+  public name: string;
+  public columns: Array<Column> = [];
+
+  public constructor (name: string) {
+    this.name = name;
+  }
+}

lib/snippets/database/index.ts

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+import { Snippet } from '../../Snippet';
+
+export default class Database implements Snippet {
+  public start (): Promise<void> {
+    // noop
+  }
+}

lib/snippets/database/patch_actions/RenameColumn.ts

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+import { Serializable } from '../classes/Serializable';
+
+export class RenameColumn implements Serializable {
+  public column: string;
+  public new_name: string;
+
+  public constructor (column: string, new_name = null) {
+    if (new_name === null) {
+      const regex = /(?<column>[a-z_]+) (?<new_name>[a-z_]+)/iu;
+      const res = regex.exec (column);
+      if (res === null || typeof res.groups === 'undefined')
+        throw new Error ('invalid string to deserialize');
+
+      this.column = res.groups.column;
+      this.new_name = res.groups.new_name;
+      return;
+    }
+
+    this.column = column;
+    this.new_name = new_name as unknown as string;
+  }
+
+  public serialize (): string {
+    return `${this.column} ${this.new_name}`;
+  }
+}