feat: 实现模板解析，自动识别 {{占位符}}

tests/python/test_parser.py

@@ -1 +1,28 @@
-# placeholder
+import sys, os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "../../python"))
+
+from parser import parse_template
+
+FIXTURE = os.path.join(os.path.dirname(__file__), "../fixtures/sample_template.xlsx")
+
+def test_returns_sheets():
+    result = parse_template(FIXTURE)
+    assert "sheets" in result
+    assert "Sheet1" in result["sheets"]
+
+def test_detects_placeholders():
+    result = parse_template(FIXTURE)
+    names = [p["name"] for p in result["placeholders"]]
+    assert "编号" in names
+    assert "姓名" in names
+
+def test_ignores_non_placeholders():
+    result = parse_template(FIXTURE)
+    names = [p["name"] for p in result["placeholders"]]
+    assert "normal_value" not in names
+
+def test_placeholder_has_cell_info():
+    result = parse_template(FIXTURE)
+    biaohao = next(p for p in result["placeholders"] if p["name"] == "编号")
+    assert biaohao["sheet"] == "Sheet1"
+    assert biaohao["cell"] == "B3"