Fix the issue 629 and add two testcases (#698)

json-path/src/main/java/com/jayway/jsonpath/internal/path/PathCompiler.java

@@ -207,6 +207,21 @@ public class PathCompiler {
 
         List<Parameter> functionParameters = null;
         if (isFunction) {
+            int parenthesis_count = 1;
+            for(int i = readPosition + 1; i < path.length(); i++){
+                if (path.charAt(i) == CLOSE_PARENTHESIS)
+                    parenthesis_count--;
+                else if (path.charAt(i) == OPEN_PARENTHESIS)
+                    parenthesis_count++;
+                if (parenthesis_count == 0)
+                    break;
+            }
+
+            if (parenthesis_count != 0){
+                String functionName = path.subSequence(startPosition, endPosition).toString();
+                throw new InvalidPathException("Arguments to function: '" + functionName + "' are not closed properly.");
+            }
+
             if (path.inBounds(readPosition+1)) {
                 // read the next token to determine if we have a simple no-args function call
                 char c = path.charAt(readPosition + 1);

json-path/src/test/java/com/jayway/jsonpath/internal/function/Issue629.java

@@ -0,0 +1,32 @@
+package com.jayway.jsonpath.internal.function;
+
+import com.jayway.jsonpath.JsonPath;
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.junit.Assert.assertTrue;
+
+public class Issue629 {
+    @Test
+    public void testUncloseParenthesis() throws IOException {
+        try {
+            JsonPath jsonPath = JsonPath.compile("$.A.B.C.D(");
+            assert(false);
+        }
+        catch (Exception e) {
+            assertTrue(e.getMessage().startsWith("Arguments to function:"));
+        }
+    }
+
+    @Test
+    public void testUncloseParenthesisWithNestedCall() throws IOException {
+        try {
+            JsonPath jsonPath = JsonPath.compile("$.A.B.C.sum(D()");
+            assert(false);
+        }
+        catch (Exception e) {
+            assertTrue(e.getMessage().startsWith("Arguments to function:"));
+        }
+    }
+}