docs: add runtime module functions

docs/reference/model/overview.md

@@ -57,4 +57,7 @@ For relatively complex general logic, it is provided through the system modules.
    <DocsCard header="template" href="template">
     <p>Provides template functions.</p>
   </DocsCard>
+   <DocsCard header="runtime" href="runtime">
+    <p>Provides runtime functions.</p>
+  </DocsCard>
 </DocsCards>

docs/reference/model/runtime.md

@@ -0,0 +1,30 @@
+---
+title: "runtime"
+linkTitle: "runtime"
+type: "docs"
+description: runtime functions
+weight: 100
+---
+
+## catch
+
+`catch(func: () -> any) -> str`
+
+Executes the provided function and catches any potential runtime errors. Returns undefined if execution is successful, otherwise returns an error message in case of a runtime panic.
+
+```python3
+import runtime
+
+schema Person:
+    name: str
+    age: int
+
+    check:
+        0 <= age <= 120, "age must be in [1, 120], got ${age}"
+
+test_person_check_error = lambda {
+    assert runtime.catch(lambda {
+        p = Person {name = "Alice", age: -1}
+    }) == "age must be in [1, 120], got -1"
+}
+```

i18n/zh-CN/docusaurus-plugin-content-docs/current/reference/model/overview.md

@@ -57,4 +57,7 @@ KCL 通过内置模块、系统库模块和插件模块提供工程化的扩展
   <DocsCard header="template" href="template">
     <p>提供了与模版相关的函数。</p>
   </DocsCard>
+  <DocsCard header="runtime" href="runtime">
+    <p>提供了与运行时相关的函数。</p>
+  </DocsCard>
 </DocsCards>

i18n/zh-CN/docusaurus-plugin-content-docs/current/reference/model/runtime.md

@@ -0,0 +1,30 @@
+---
+title: "runtime"
+linkTitle: "runtime"
+type: "docs"
+description: 运行时函数
+weight: 100
+---
+
+## catch
+
+`catch(func: () -> any) -> str`
+
+`catch` 函数可以执行代码块并捕获任何潜在的运行时错误。如果代码块中没有发生异常，`catch` 函数返回 `Undefined`，否则返回异常信息。
+
+```python3
+import runtime
+
+schema Person:
+    name: str
+    age: int
+
+    check:
+        0 <= age <= 120, "age must be in [1, 120], got ${age}"
+
+test_person_check_error = lambda {
+    assert runtime.catch(lambda {
+        p = Person {name = "Alice", age: -1}
+    }) == "age must be in [1, 120], got -1"
+}
+```