engines moved to separate library

lib/engines/default/SqlDumper.js

@@ -0,0 +1,64 @@
+class SqlDumper {
+  /** @param driver {import('dbgate').EngineDriver} */
+  constructor(driver) {
+    this.s = '';
+    this.driver = driver;
+    this.dialect = driver.dialect;
+  }
+  putRaw(text) {
+    this.s += text;
+  }
+  putCmd(text) {
+    this.putRaw(text);
+    this.putRaw(';\n');
+  }
+  putFormattedValue(c, value) {
+    switch (c) {
+      case 's':
+        if (value != null) {
+          this.putRaw(value.toString());
+        }
+        break;
+      case 'f':
+        {
+          const { schemaName, pureName } = value;
+          if (schemaName) {
+            this.putRaw(this.dialect.quoteIdentifier(schemaName));
+            this.putRaw('.');
+          }
+          this.putRaw(this.dialect.quoteIdentifier(pureName));
+        }
+        break;
+    }
+  }
+  /** @param format {string} */
+  put(format, ...args) {
+    let i = 0;
+    let argIndex = 0;
+    const length = format.length;
+    while (i < length) {
+      let c = format[i];
+      i++;
+      switch (c) {
+        case '^':
+          while (i < length && format[i].match(/[a-z]/i)) {
+            this.putRaw(format[i].toUpperCase());
+            i++;
+          }
+          break;
+        case '%':
+          c = format[i];
+          i++;
+          this.putFormattedValue(c, args[argIndex]);
+          argIndex++;
+          break;
+
+        default:
+          this.putRaw(c);
+          break;
+      }
+    }
+  }
+}
+
+module.exports = SqlDumper;