feat: graph parses json according to frontend requirements

Author: HarrySu123

evaluation_function/evaluation.py

@@ -617,13 +617,29 @@ def _err(msg: str) -> Result:
 
     # ── parse & validate inputs ──────────────────────────────────────────
 
+    # Parse response (student's graph)
+    response_dict = _to_dictish(response) or {}
+    
+    # Check if response contains frontend pipe-delimited format and convert
+    if is_frontend_format(response_dict):
+        parsed_graph = parse_frontend_graph(response_dict)
+        response_dict = {"graph": parsed_graph}
+    
     try:
-        resp = Response.model_validate(_to_dictish(response) or {})
+        resp = Response.model_validate(response_dict)
     except ValidationError as e:
         return _err(f"Invalid response schema: {e}")
 
+    # Parse answer (teacher's reference)
+    answer_dict = _to_dictish(answer) or {}
+    
+    # Check if answer contains frontend pipe-delimited format and convert
+    if is_frontend_format(answer_dict):
+        parsed_graph = parse_frontend_graph(answer_dict)
+        answer_dict = {"graph": parsed_graph}
+    
     try:
-        ans = Answer.model_validate(_to_dictish(answer) or {})
+        ans = Answer.model_validate(answer_dict)
     except ValidationError as e:
         return _err(f"Invalid answer schema: {e}")
 
@@ -633,7 +649,7 @@ def _err(msg: str) -> Result:
     except ValidationError as e:
         if ans.graph is None:
             return _err(
-                "Testing: Invalid params schema. Expected e.g. "
+                "Invalid params schema. Expected e.g. "
                 "{'evaluation_type': 'connectivity'|'bipartite'|'graph_coloring'|...}. "
                 f"Error: {e}"
             )

evaluation_function/schemas/graph.py

@@ -11,6 +11,8 @@
 class Node(BaseModel):
     id: str = Field(..., description="Unique identifier for the node")
     label: Optional[str] = Field(None, description="Display label")
+    x: Optional[float] = Field(None, description="X coordinate for visual display (not used in evaluation)")
+    y: Optional[float] = Field(None, description="Y coordinate for visual display (not used in evaluation)")
 
     class Config:
         extra = "allow"
@@ -31,6 +33,8 @@ class Graph(BaseModel):
     nodes: list[Node] = Field(..., description="List of nodes in the graph")
     edges: list[Edge] = Field(default_factory=list, description="List of edges")
     directed: bool = Field(False, description="Whether the graph is directed")
+    weighted: bool = Field(False, description="Whether the graph is weighted (metadata only, not used in evaluation)")
+    multigraph: bool = Field(False, description="Whether the graph allows multiple edges (metadata only, not used in evaluation)")
 
     class Config:
         extra = "allow"