fix single token error

+ 1.0.11 version bump

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jitterbit-script",
-  "version": "1.0.10",
+  "version": "1.0.11",
   "description": "Static typechecker and interpreter for Jitterbit Script",
   "main": "build/index.js",
   "scripts": {

src/frontend/parser.ts

@@ -214,13 +214,17 @@ export default class Parser {
       }
     }
     // Remove <trans> and </trans>, restore EOF
-    this.tokens.shift();
-    const last = this.tokens.pop() as Token;
-    if(last.type === TokenType.CloseTransTag) {
-      this.endTagStart = last.begin;
-      this.endTagEnd = last.end;
+    if(diagnostics && this.tokens.length < 2)
+      return result;
+    else {
+      this.tokens.shift();
+      const last = this.tokens.pop() as Token;
+      if(last.type === TokenType.CloseTransTag) {
+        this.endTagStart = last.begin;
+        this.endTagEnd = last.end;
+      }
+      this.tokens.push(new Token("EndOfFile", TokenType.EOF, last.end, last.end));
     }
-    this.tokens.push(new Token("EndOfFile", TokenType.EOF, last.end, last.end));
     return result;
   }
 

test.jb

@@ -1,3 +1 @@
-<trans>
-  x +
-</trans>
+<><

tests/typechecker/errors.test.ts

@@ -275,4 +275,22 @@ msg = Case(
     const result = typecheck("");
     expect(result.diagnostics.length).toStrictEqual(0);
   });
+
+  test('"<" script.', function() {
+    const result = typecheck("<");
+    expect(result.diagnostics.length).toStrictEqual(2);
+    // No <trans> tag, the script returns its content as string.
+    expect(result.diagnostics[0].error).toStrictEqual(true);
+    // The script is missing '</trans>' scope closing tag.
+    expect(result.diagnostics[1].error).toStrictEqual(true);
+  });
+
+  test('Fish script ("<><").', function() {
+    const result = typecheck("<");
+    expect(result.diagnostics.length).toStrictEqual(2);
+    // No <trans> tag, the script returns its content as string.
+    expect(result.diagnostics[0].error).toStrictEqual(true);
+    // The script is missing '</trans>' scope closing tag.
+    expect(result.diagnostics[1].error).toStrictEqual(true);
+  });
 });