refactor script compilation to make it easy to add new expressions #41 #53

src/application/Parser/Script/Compiler/Expressions/Expression/ExpressionPosition.ts

@@ -0,0 +1,15 @@
+export class ExpressionPosition {
+    constructor(
+        public readonly start: number,
+        public readonly end: number) {
+        if (start === end) {
+            throw new Error(`no length (start = end = ${start})`);
+        }
+        if (start > end) {
+            throw Error(`start (${start}) after end (${end})`);
+        }
+        if (start < 0) {
+            throw Error(`negative start position: ${start}`);
+        }
+    }
+}