introduced sqltree typescript library

packages/sqltree/.gitignore

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+lib

packages/sqltree/package.json

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+{
+  "version": "0.1.0",
+  "name": "@dbgate/sqltree",
+  "main": "lib/index.js",
+  "typings": "lib/index.d.ts",
+  "scripts": {
+    "prepare": "yarn build",
+    "build": "tsc",
+    "start": "tsc --watch"
+  },
+  "files": [
+    "lib"
+  ],
+  "devDependencies": {
+    "@dbgate/types": "^0.1.0",
+    "@types/node": "^13.7.0",
+    "typescript": "^3.7.5"
+  }
+}

packages/sqltree/src/Command.ts

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+import { EngineDriver, SqlDumper } from "@dbgate/types";
+
+class Command {
+  toSql(driver: EngineDriver) {
+    const dumper = driver.createDumper();
+    this.dumpSql(dumper);
+    return dumper.s;
+  }
+
+  dumpSql(dumper: SqlDumper) {}
+}
+
+export default Command;

packages/sqltree/src/Select.ts

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+import Command from "./Command";
+import { NamedObjectInfo, RangeDefinition, SqlDumper } from "@dbgate/types";
+
+class Select extends Command {
+  topRecords: number;
+  from: NamedObjectInfo;
+  range: RangeDefinition;
+  distinct = false;
+  selectAll = false;
+
+  dumpSql(dumper: SqlDumper) {
+    dumper.put("^select ");
+    if (this.topRecords) {
+      dumper.put("^top %s ", this.topRecords);
+    }
+    if (this.distinct) {
+      dumper.put("^distinct ");
+    }
+    if (this.selectAll) {
+      dumper.put("* ");
+    } else {
+      // TODO
+    }
+    dumper.put("^from %f ", this.from);
+    if (this.range) {
+      dumper.put("^limit %s ^offset %s ", this.range.limit, this.range.offset);
+    }
+  }
+}
+
+export default Select;

packages/sqltree/src/index.ts

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+export { default as Select } from "./Select";
+export { default as Command } from "./Command";

packages/sqltree/tsconfig.json

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+{
+    "compilerOptions": {
+      "target": "ES2015",
+      "module": "commonjs",
+      "declaration": true,
+      "skipLibCheck": true,
+      "outDir": "lib"
+    },
+    "include": [
+      "src/**/*"
+    ]
+  }