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模板⑦「批量处理(循环)」是唯一一个装好就红着的内置模板——新用户点开第一眼
看到「1 个错误」,运行按钮还是灰的:
{{ vars.item }} 没有任何节点产出,是不是想写 {{ vars.items }}?
**但模板是对的。** 循环节点配的 item_var 就叫 item,control.py:142 每轮往
vars 里注入 vars.item 和 vars.item_index。错的是静态分析器:产出侧只登记了
input.*、vars.<assign_to>、nodes.<id>,从来没登记过循环注入的那两个。
kind="loop" 在 _KIND_ORDER 里一直占着位置,只是没人产出过——漏实现,
不是设计如此。
顺着修下来一共三处误报,都是同一类:
**一、循环变量没登记。** 补上 vars.<item_var> 和 vars.<item_var>_index,
只在 foreach 模式(while 不遍历列表,自然没有"当前项")。
**二、顺序判定被回边搞乱。** 补上之后错误降成警告,但换了一句同样不对的话:
"{{ vars.item }} 由「逐条循环」产出,但那一步在这之后才跑"。循环体末尾有一条
回到循环节点的边,于是循环节点的拓扑深度被推高、反而排在自己的体后面。
改成先算出每个循环的"体"(从 body 出口走可达闭包,遇到循环节点自己就停),
体内引用不套先后判定。体**外面**引用它确实取不到值,那条留着,
并换成说得清的措辞:"只在循环体内部有值"。
**三、表达式字段里的裸引用没扫。** transform 的 expression、branch 的
cases[].condition、skip_if 写的是裸 vars.x,没有 {{ }},而扫描只认模板语法。
于是模板⑦里 `(vars.collected or '') + str(vars.one)` 一个引用都认不出来,
vars.one 被报成"产出了但没有任何地方引用"——它明明在用。
顺带把"没人用"这条收窄到**作者声明过的**变量:循环的 item_index 和入口字段的
vars.<name> 别名都是系统自动提供的,报它们等于噪音(内置变量没有 produced_by,
本来就不在这条路上)。而真正未引用的 assign_to 照报不误——⑤⑥⑧ 还各有一两条。
误报是 linter 最坏的失败模式:它会让人把整个校验一起无视掉。这条理由本来就
写在这个文件的注释里,只是自己没做到。
现在 8 个内置模板全部零错误。验证:后端 284 passed(test_variables.py 新增
8 条,含"体外引用仍然要警告"和"while 模式没有当前项"两条反向断言);
三个前端 check 不回归。
344 lines
15 KiB
Python
344 lines
15 KiB
Python
"""变量静态分析。
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这套模板取不到值时渲染成空字符串(为了让半成品的图也能跑)。代价是拼错一个
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变量名不会报错、不会警告、不留痕迹——下游拿到空文本,模型基于空内容一本正经
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地编一段回答出来。这些测试守的就是"在跑之前把这件事说破"。
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"""
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from __future__ import annotations
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from app.engine.schema import GraphSpec
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from app.engine.variables import analyze
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def _graph(nodes, edges=()):
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return GraphSpec.model_validate({
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"nodes": [
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{"id": n["id"], "type": n["type"], "position": {"x": 0, "y": 0},
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"data": {"label": n.get("label", ""), "config": n.get("config", {})}}
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for n in nodes
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],
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"edges": [
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{"source": e[0], "target": e[1], **({"sourceHandle": e[2]} if len(e) > 2 else {})}
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for e in edges
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],
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})
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def test_lists_what_each_node_produces() -> None:
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g = _graph([
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{"id": "start", "type": "input", "label": "输入",
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"config": {"fields": [{"name": "question", "description": "用户的问题"}]}},
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{"id": "q", "type": "llm", "label": "取数", "config": {"assign_to": "sales"}},
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], [("start", "q")])
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paths = {v.path: v for v in analyze(g).variables}
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assert "input.question" in paths
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assert paths["input.question"].description == "用户的问题"
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assert "vars.sales" in paths
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assert paths["vars.sales"].produced_by == "q"
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# 每个节点的输出都能被引用,不用显式声明
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assert "nodes.start" in paths and "nodes.q" in paths
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def test_input_fields_are_also_available_as_vars() -> None:
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"""入口节点把每个字段同时写进 vars(run_input 里 input 和 vars 是同一份)。
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不认这一条,{{ vars.topic }} 这种完全合法的写法会被报成"未定义"——
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误报是 linter 最坏的失败模式,它会让人把整个校验一起无视掉。
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"""
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g = _graph([
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{"id": "start", "type": "input", "config": {"fields": [{"name": "topic"}]}},
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{"id": "a", "type": "llm", "config": {"prompt": "{{ vars.topic }}"}},
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], [("start", "a")])
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assert [i for i in analyze(g).issues if i.level != "info"] == []
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def test_bare_namespace_roots_are_valid() -> None:
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"""{{ input }} 取整个输入 dict,{{ vars }} 取整个变量池——都是合法写法。
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上一版把这三个根跳过了没注册,于是 {{ input }} 被报成"没有任何节点产出"。
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这不是一条无害的多余提示:runs 启动前要过校验,一条假错误意味着整张图
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什么都跑不了。实际把问数据页整个卡住过。
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"""
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g = _graph([
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{"id": "start", "type": "input", "config": {"fields": [{"name": "q"}]}},
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{"id": "a", "type": "llm", "config": {
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"prompt": "{{ input }} {{ vars }} {{ nodes }} {{ messages }} {{ last_message }}",
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}},
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], [("start", "a")])
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bad = [i for i in analyze(g).issues if i.level in ("error", "warning")]
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assert bad == [], [i.message for i in bad]
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def test_unknown_root_is_only_a_warning() -> None:
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"""认不出的根可能只是我没建模的东西,不该拦住运行。
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能穷举的(vars/input/nodes 的成员)才报 error——那几个命名空间的成员
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全是从图里扫出来的,没扫到就是真没有。
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"""
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g = _graph([
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{"id": "a", "type": "llm", "config": {"prompt": "{{ 某个我不认识的东西.x }}"}},
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])
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issues = [i for i in analyze(g).issues if i.level != "info"]
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assert len(issues) == 1 and issues[0].level == "warning", [i.model_dump() for i in issues]
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def test_input_is_open_when_no_fields_are_declared() -> None:
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"""入口不声明字段时,input.* 是开放的——运行时传什么键都行。
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问数据页就是这样:问题由系统注入成 input.question,而入口节点里一个
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字段都没有(声明了反而会要求用户再填一次表单)。把它报成"未定义"会让
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整条对话路径跑不起来——实际发生过。
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"""
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g = _graph([
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{"id": "start", "type": "input", "config": {}},
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{"id": "a", "type": "llm", "config": {"prompt": "{{ input.question }}"}},
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], [("start", "a")])
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assert [i for i in analyze(g).issues if i.level != "info"] == []
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def test_input_is_closed_once_fields_are_declared() -> None:
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"""声明了字段就是闭集,那时候拼错才叫拼错。"""
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g = _graph([
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{"id": "start", "type": "input", "config": {"fields": [{"name": "question"}]}},
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{"id": "a", "type": "llm", "config": {"prompt": "{{ input.quesiton }}"}},
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], [("start", "a")])
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errs = [i for i in analyze(g).issues if i.level == "error"]
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assert len(errs) == 1 and "input.question" in errs[0].message
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def test_typo_is_reported_with_a_suggestion() -> None:
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"""拼错是这里最常见的错误。只说"不存在"没用,能猜就直说。"""
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g = _graph([
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{"id": "start", "type": "input", "config": {"fields": [{"name": "question"}]}},
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{"id": "a", "type": "llm", "label": "作答",
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"config": {"prompt": "回答:{{ input.quesiton }}"}},
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], [("start", "a")])
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errs = [i for i in analyze(g).issues if i.level == "error"]
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assert len(errs) == 1
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assert "input.quesiton" in errs[0].message
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assert "input.question" in errs[0].message, "应该给出拼写建议"
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assert errs[0].node_id == "a"
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# 必须说清后果,否则用户不知道为什么"没报错但结果不对"
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assert "空字符串" in errs[0].message
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def test_reference_before_production_is_a_warning() -> None:
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"""变量确实存在,但那一步在这之后才跑——这时候取到的是空。
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这类最难查:变量名拼对了,表里也有,就是值不对。
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"""
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g = _graph([
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{"id": "start", "type": "input", "config": {"fields": [{"name": "q"}]}},
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{"id": "use", "type": "llm", "label": "用它", "config": {"prompt": "{{ vars.later }}"}},
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{"id": "make", "type": "llm", "label": "产出它", "config": {"assign_to": "later"}},
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], [("start", "use"), ("use", "make")])
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warns = [i for i in analyze(g).issues if i.level == "warning"]
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assert len(warns) == 1
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assert "vars.later" in warns[0].message
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assert "产出它" in warns[0].message, "要说清是谁产出的"
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assert warns[0].node_id == "use"
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def test_same_node_reading_its_own_var_is_fine() -> None:
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"""循环里节点读自己上一轮写的变量是正常写法,不该报。"""
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g = _graph([
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{"id": "n", "type": "llm", "label": "累加",
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"config": {"assign_to": "acc", "prompt": "上一轮:{{ vars.acc }}"}},
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])
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assert [i for i in analyze(g).issues if i.level in ("error", "warning")] == []
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def test_unused_variable_is_only_info() -> None:
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"""产出没人用不一定是错,常常是改图改了一半——提一句,但别拦着跑。"""
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g = _graph([
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{"id": "a", "type": "llm", "label": "算一下", "config": {"assign_to": "unused"}},
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])
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issues = analyze(g).issues
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assert [i.level for i in issues] == ["info"]
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assert "vars.unused" in issues[0].message
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def test_drilling_into_a_value_is_fine_but_the_variable_must_exist() -> None:
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"""往值内部钻不校验(结构是运行期才有的),但第二段必须存在。
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分寸就在这里:退得太松,{{ input.quesiton }} 会退到 input 被当成合法,
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拼写检查整个失效;退得太紧,{{ vars.rows[0].name }} 会被误报。
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"""
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g = _graph([
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{"id": "a", "type": "llm", "config": {
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"assign_to": "rows",
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"prompt": "{{ vars.rows[0].name }} {{ nodes.a.text }}", # 都该通过
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}},
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{"id": "b", "type": "llm", "config": {
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"prompt": "{{ vars.rowz[0].name }}", # 第二段拼错了
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}},
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], [("a", "b")])
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errs = [i for i in analyze(g).issues if i.level == "error"]
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assert len(errs) == 1, [i.message for i in errs]
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assert "vars.rowz" in errs[0].message and errs[0].node_id == "b"
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def test_builtins_and_filters_and_indexes_resolve() -> None:
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g = _graph([
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{"id": "a", "type": "llm", "config": {
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"prompt": "{{ last_message }} {{ vars.rows[0].name }} {{ nodes.a.text | json }}",
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"assign_to": "rows",
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}},
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])
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assert [i for i in analyze(g).issues if i.level != "info"] == []
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def test_scans_nested_config_not_just_top_level() -> None:
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"""output.fields[].value、code 节点的 files 都是嵌套的,漏扫等于没扫。"""
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g = _graph([
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{"id": "out", "type": "output", "config": {
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"fields": [{"name": "结果", "value": "{{ vars.nope }}"}],
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}},
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])
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errs = [i for i in analyze(g).issues if i.level == "error"]
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assert len(errs) == 1 and "vars.nope" in errs[0].message
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assert "fields[0].value" in errs[0].path or errs[0].path == "vars.nope"
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def test_cycle_does_not_hang() -> None:
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"""循环图很常见(loop 的 body 连回 loop 本身),拓扑分析不能死循环。"""
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g = _graph(
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[{"id": "a", "type": "llm"}, {"id": "b", "type": "llm"}],
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[("a", "b"), ("b", "a")],
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)
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assert analyze(g).variables # 跑得完就行
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# --------------------------------------------------------------------------
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# 循环变量
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# --------------------------------------------------------------------------
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#
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# 模板⑦「批量处理(循环)」装好就红着:{{ vars.item }} 被报成"没有任何节点
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# 产出",而那是循环最正常的写法。它是唯一一个内置模板开箱就报错的,
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# 新用户点开第一眼看到的就是红字,运行按钮还是灰的。
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#
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# 根因不在模板,在这里:产出侧从来没登记过循环注入的变量
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# (control.py:142 每轮写 vars.<item_var> 和 vars.<item_var>_index)。
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# kind="loop" 在 _KIND_ORDER 里一直有位置,只是没人产出过。
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def _loop_graph(*, item_var="item", body_ref="{{ vars.item }}", extra_node=None):
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"""input → loop →(body) handle → 回到 loop;loop →(done) out。
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末尾那条回边是关键:它让 loop 的拓扑深度反而大于自己的循环体。
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"""
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nodes = [
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{"id": "start", "type": "input", "config": {"fields": [{"name": "items"}]}},
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{"id": "each", "type": "loop", "label": "逐条循环",
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"config": {"mode": "foreach", "items": "{{ input.items }}", "item_var": item_var}},
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{"id": "handle", "type": "llm", "label": "处理单条", "config": {"prompt": body_ref}},
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{"id": "out", "type": "output", "config": {}},
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]
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if extra_node:
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nodes.append(extra_node)
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edges = [("start", "each"), ("each", "handle", "body"),
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("handle", "each"), ("each", "out", "done")]
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if extra_node:
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edges.append(("out", extra_node["id"]))
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return _graph(nodes, edges)
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def test_loop_item_is_a_known_variable() -> None:
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"""循环体里引用 {{ vars.item }} 不该被报成未定义。"""
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report = analyze(_loop_graph())
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paths = {v.path for v in report.variables}
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assert "vars.item" in paths
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assert "vars.item_index" in paths
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errors = [i for i in report.issues if i.level == "error"]
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assert not errors, [i.message for i in errors]
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def test_loop_item_follows_the_configured_name() -> None:
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report = analyze(_loop_graph(item_var="row", body_ref="{{ vars.row }}"))
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paths = {v.path for v in report.variables}
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assert {"vars.row", "vars.row_index"} <= paths
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assert not [i for i in report.issues if i.level == "error"]
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def test_no_false_ordering_warning_inside_the_loop_body() -> None:
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"""循环体的拓扑深度因为回边天然小于循环节点,套用"先后"判定必然误报。
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以前报的是"{{ vars.item }} 由「逐条循环」产出,但那一步在这之后才跑"——
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而那正是循环最正常的写法。
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"""
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report = analyze(_loop_graph())
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assert not [i for i in report.issues if "在这之后才跑" in i.message], \
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[i.message for i in report.issues]
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def test_loop_variable_outside_the_body_still_warns() -> None:
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"""但在循环体**外面**引用它确实取不到值,这条要留着。"""
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outside = {"id": "after", "type": "llm", "label": "循环之后",
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"config": {"prompt": "{{ vars.item }}"}}
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report = analyze(_loop_graph(extra_node=outside))
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warns = [i for i in report.issues if i.node_id == "after"]
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assert warns, [i.message for i in report.issues]
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assert "只在循环体内部有值" in warns[0].message
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def test_while_loop_has_no_current_item() -> None:
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"""while 模式不遍历列表,自然没有"当前项"(control.py 只在 foreach 分支注入)。"""
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report = analyze(_graph([
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{"id": "lp", "type": "loop",
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"config": {"mode": "while", "condition": "vars.done != True", "item_var": "item"}},
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]))
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assert "vars.item" not in {v.path for v in report.variables}
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# --------------------------------------------------------------------------
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# 表达式字段里的裸引用
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# --------------------------------------------------------------------------
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def test_bare_refs_in_expression_fields_count_as_usage() -> None:
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"""表达式字段写的是裸 vars.x,没有 {{ }}——只扫模板语法会认不出来。
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模板⑦里 `(vars.collected or '') + str(vars.one)` 就是这样,
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于是 vars.one 被报成"产出了但没有任何地方引用",而它明明在用。
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"""
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report = analyze(_graph([
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{"id": "a", "type": "llm", "config": {"prompt": "x", "assign_to": "one"}},
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{"id": "b", "type": "transform", "config": {
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"mode": "expression",
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"expression": "(vars.collected or '') + str(vars.one)",
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"assign_to": "collected",
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}},
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], [("a", "b")]))
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one = next(v for v in report.variables if v.path == "vars.one")
|
||
assert one.refs, "表达式里用了就不该说没人用"
|
||
assert not [i for i in report.issues if "vars.one" in i.message]
|
||
|
||
|
||
def test_branch_case_conditions_count_as_usage() -> None:
|
||
report = analyze(_graph([
|
||
{"id": "a", "type": "llm", "config": {"prompt": "x", "assign_to": "score"}},
|
||
{"id": "b", "type": "branch", "config": {
|
||
"mode": "expression",
|
||
"cases": [{"key": "hi", "condition": "vars.score > 3"}],
|
||
}},
|
||
], [("a", "b")]))
|
||
assert next(v for v in report.variables if v.path == "vars.score").refs
|
||
|
||
|
||
def test_auto_provided_variables_are_not_nagged_about() -> None:
|
||
"""系统自动提供的变量不报"没人用"——作者没声明过它,提醒他等于噪音。
|
||
|
||
内置变量(last_message 等)本来就不在这条路上;循环的 item_index 和
|
||
入口字段的 vars.<name> 别名以前会被报,而真正的 input.<name> 用着呢。
|
||
"""
|
||
report = analyze(_loop_graph())
|
||
unused = [i.message for i in report.issues if "没有任何地方引用" in i.message]
|
||
assert not any("item_index" in m for m in unused), unused
|
||
assert not any("vars.items" in m for m in unused), unused
|