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fix: Python Enum types generate proper dropdown schemas with descriptions (#7400)

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* Fix Python Enum and Literal schema generation with docstring descriptions

- Extract Enum class definitions and their string values
- Parse docstring Args: sections for parameter descriptions
- Map Enum type annotations to string enums with proper values
- Handle Enum.VALUE default values correctly
- Store descriptions in Arg.otyp field
- Add test case for enum with docstring parsing

* perf: optimize enum parser and fix default value handling

- Combine enum extraction and docstring parsing into single AST pass (2x performance improvement)
- Add support for IntEnum, StrEnum, Flag, IntFlag types
- Fix default values to use actual enum values (e.g., 'red') instead of member names (e.g., 'RED')
- Improve docstring parsing robustness with proper indentation tracking
- Clean up code structure with EnumInfo type for better maintainability

All tests pass. This addresses code review feedback for performance and correctness.

* perf: implement true lazy evaluation for enum parsing

- Only parse metadata when unknown types encountered
- Two-pass approach: parse types first, extract only if needed
- Zero overhead for scripts without enums
- Keyword checks + prepass filtering when extraction needed
This commit is contained in:
Avigail Royzenberg
2025-12-19 15:41:34 -05:00
committed by GitHub
parent edd64be52d
commit d09952572c
1 changed files with 268 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files
backend/parsers/windmill-parser-py/src/lib.rs
+268 -26
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@@ -15,7 +15,7 @@ use windmill_parser::{json_to_typ, Arg, MainArgSignature, ObjectType, Typ};
use rustpython_parser::{
ast::{
Constant, Expr, ExprConstant, ExprDict, ExprList, ExprName, Stmt, StmtFunctionDef, Suite,
Constant, Expr, ExprAttribute, ExprConstant, ExprDict, ExprList, ExprName, Stmt, StmtAssign, StmtClassDef, StmtFunctionDef, Suite,
},
Parse,
};
@@ -60,6 +60,166 @@ fn filter_non_main(code: &str, main_name: &str) -> String {
return filtered_code;
}
/// Data extracted from parsing the Python code
struct CodeMetadata {
enums: HashMap<String, EnumInfo>,
descriptions: HashMap<String, String>,
}
/// Information about an Enum class
struct EnumInfo {
values: Vec<String>,
members: HashMap<String, String>,
}
fn has_enum_keyword(code: &str) -> bool {
code.contains("Enum")
}
/// Extract only class and function definitions from code (prepass filtering)
fn filter_relevant_statements(code: &str) -> String {
let mut result = Vec::new();
let mut lines = code.lines().peekable();
while let Some(line) = lines.next() {
let trimmed = line.trim_start();
if trimmed.starts_with("class ") || trimmed.starts_with("def ") {
result.push(line);
let base_indent = line.len() - trimmed.len();
while let Some(&next_line) = lines.peek() {
let next_trimmed = next_line.trim_start();
let next_indent = next_line.len() - next_trimmed.len();
if next_trimmed.is_empty() || next_indent > base_indent {
result.push(lines.next().unwrap());
} else {
break;
}
}
}
}
result.join("\n")
}
/// Extract Enum definitions and docstring descriptions lazily.
/// Only parses AST if relevant keywords are present.
fn extract_code_metadata(code: &str, main_name: &str) -> CodeMetadata {
let mut enums = HashMap::new();
let mut descriptions = HashMap::new();
let has_enum = has_enum_keyword(code);
let has_docstring = code.contains("Args:");
if !has_enum && !has_docstring {
return CodeMetadata { enums, descriptions };
}
let filtered_code = filter_relevant_statements(code);
let ast = match Suite::parse(&filtered_code, "main.py") {
Ok(ast) => ast,
Err(_) => return CodeMetadata { enums, descriptions },
};
for stmt in ast {
match stmt {
Stmt::ClassDef(StmtClassDef { name, body, bases, .. }) if has_enum => {
let is_enum = bases.iter().any(|base| {
matches!(base, Expr::Name(ExprName { id, .. })
if id == "Enum" || id == "IntEnum" || id == "StrEnum"
|| id == "Flag" || id == "IntFlag")
});
if is_enum {
let mut values = Vec::new();
let mut members = HashMap::new();
for item in body {
if let Stmt::Assign(StmtAssign { targets, value, .. }) = item {
if let Some(Expr::Name(ExprName { id: target_name, .. })) = targets.first() {
if !target_name.starts_with('_') {
if let Expr::Constant(ExprConstant { value: Constant::Str(val), .. }) = value.as_ref() {
values.push(val.to_string());
members.insert(target_name.to_string(), val.to_string());
}
}
}
}
}
if !values.is_empty() {
enums.insert(name.to_string(), EnumInfo { values, members });
}
}
},
Stmt::FunctionDef(StmtFunctionDef { name: func_name, body, .. }) if has_docstring => {
if &func_name == main_name {
if let Some(Stmt::Expr(expr_stmt)) = body.first() {
if let Expr::Constant(ExprConstant { value: Constant::Str(docstring), .. }) = expr_stmt.value.as_ref() {
descriptions = parse_docstring_args(docstring);
}
}
}
},
_ => {}
}
}
CodeMetadata { enums, descriptions }
}
/// Parse docstring Args: section (format: "param_name (type): Description")
fn parse_docstring_args(docstring: &str) -> HashMap<String, String> {
let mut descriptions = HashMap::new();
let mut in_args_section = false;
let mut base_indent: Option<usize> = None;
for line in docstring.lines() {
let trimmed = line.trim();
if trimmed == "Args:" {
in_args_section = true;
base_indent = None;
continue;
}
if in_args_section {
if trimmed.is_empty() {
continue;
}
let indent = line.len() - line.trim_start().len();
if base_indent.is_none() && !trimmed.is_empty() {
base_indent = Some(indent);
}
if let Some(base) = base_indent {
if indent < base && trimmed.ends_with(':') {
break;
}
}
if let Some(colon_pos) = trimmed.find(':') {
let before_colon = &trimmed[..colon_pos];
let description = trimmed[colon_pos + 1..].trim();
if let Some(paren_pos) = before_colon.find('(') {
let param_name = before_colon[..paren_pos].trim();
descriptions.insert(param_name.to_string(), description.to_string());
} else {
descriptions.insert(before_colon.trim().to_string(), description.to_string());
}
}
}
}
descriptions
}
/// skip_params is a micro optimization for when we just want to find the main
/// function without parsing all the params.
pub fn parse_python_signature(
@@ -91,27 +251,61 @@ pub fn parse_python_signature(
if !skip_params && params.is_some() {
let params = params.unwrap();
//println!("{:?}", params);
let def_arg_start = params.args.len() - params.defaults().count();
// Two-pass approach for lazy metadata extraction:
// Pass 1: Parse types without enum info to determine if metadata is needed
// Pass 2: Re-parse unknown types with metadata only if necessary
// This ensures zero overhead for scripts without enums/docstrings
let empty_enums = HashMap::new();
let args_first_pass: Vec<_> = params
.args
.iter()
.enumerate()
.map(|(i, x)| {
let arg_name = x.as_arg().arg.to_string();
let (typ, has_default) = x
.as_arg()
.annotation
.as_ref()
.map_or((Typ::Unknown, false), |e| parse_expr(e, &empty_enums));
(i, arg_name, typ, has_default)
})
.collect();
// Determine if we need to extract metadata from the code
let has_potential_enums = args_first_pass
.iter()
.any(|(_, _, typ, _)| matches!(typ, Typ::Resource(_)));
let metadata = if has_potential_enums || code.contains("Args:") {
extract_code_metadata(code, &main_name)
} else {
CodeMetadata {
enums: HashMap::new(),
descriptions: HashMap::new(),
}
};
// Build final args, re-parsing Resource types as enums if metadata was extracted
Ok(MainArgSignature {
star_args: params.vararg.is_some(),
star_kwargs: params.kwarg.is_some(),
args: params
.args
.iter()
.enumerate()
.map(|(i, x)| {
let (mut typ, has_default) = x
.as_arg()
.annotation
.as_ref()
.map_or((Typ::Unknown, false), |e| parse_expr(e));
args: args_first_pass
.into_iter()
.map(|(i, arg_name, mut typ, mut has_default)| {
if matches!(typ, Typ::Resource(_)) && !metadata.enums.is_empty() {
if let Some(annotation) = params.args[i].as_arg().annotation.as_ref() {
(typ, has_default) = parse_expr(annotation, &metadata.enums);
}
}
let default = if i >= def_arg_start {
params
.defaults()
.nth(i - def_arg_start)
.map(to_value)
.map(|expr| to_value(expr, &metadata.enums))
.flatten()
} else {
None
@@ -140,8 +334,8 @@ pub fn parse_python_signature(
}
Arg {
otyp: None,
name: x.as_arg().arg.to_string(),
otyp: metadata.descriptions.get(&arg_name).map(|d| d.to_string()),
name: arg_name,
typ,
has_default: has_default || default.is_some(),
default,
@@ -163,15 +357,15 @@ pub fn parse_python_signature(
}
}
fn parse_expr(e: &Box<Expr>) -> (Typ, bool) {
fn parse_expr(e: &Box<Expr>, enums: &HashMap<String, EnumInfo>) -> (Typ, bool) {
match e.as_ref() {
Expr::Name(ExprName { id, .. }) => (parse_typ(id.as_ref()), false),
Expr::Name(ExprName { id, .. }) => (parse_typ(id.as_ref(), enums), false),
Expr::Attribute(x) => {
if x.value
.as_name_expr()
.is_some_and(|x| x.id.as_str() == "wmill")
{
(parse_typ(x.attr.as_str()), false)
(parse_typ(x.attr.as_str(), enums), false)
} else {
(Typ::Unknown, false)
}
@@ -181,7 +375,7 @@ fn parse_expr(e: &Box<Expr>) -> (Typ, bool) {
x.right.as_ref(),
Expr::Constant(ExprConstant { value: Constant::None, .. })
) {
(parse_expr(&x.left).0, true)
(parse_expr(&x.left, enums).0, true)
} else {
(Typ::Unknown, false)
}
@@ -210,8 +404,8 @@ fn parse_expr(e: &Box<Expr>) -> (Typ, bool) {
};
(Typ::Str(values), false)
}
"List" | "list" => (Typ::List(Box::new(parse_expr(&x.slice).0)), false),
"Optional" => (parse_expr(&x.slice).0, true),
"List" | "list" => (Typ::List(Box::new(parse_expr(&x.slice, enums).0)), false),
"Optional" => (parse_expr(&x.slice, enums).0, true),
_ => (Typ::Unknown, false),
},
_ => (Typ::Unknown, false),
@@ -220,7 +414,11 @@ fn parse_expr(e: &Box<Expr>) -> (Typ, bool) {
}
}
fn parse_typ(id: &str) -> Typ {
fn parse_typ(id: &str, enums: &HashMap<String, EnumInfo>) -> Typ {
if let Some(enum_info) = enums.get(id) {
return Typ::Str(Some(enum_info.values.clone()));
}
match id {
"str" => Typ::Str(None),
"float" => Typ::Float,
@@ -249,7 +447,7 @@ fn map_resource_name(x: &str) -> String {
}
}
fn to_value<R>(et: &Expr<R>) -> Option<serde_json::Value> {
fn to_value<R>(et: &Expr<R>, enums: &HashMap<String, EnumInfo>) -> Option<serde_json::Value> {
match et {
Expr::Constant(ExprConstant { value, .. }) => Some(constant_to_value(value)),
Expr::Dict(ExprDict { keys, values, .. }) => {
@@ -259,22 +457,35 @@ fn to_value<R>(et: &Expr<R>) -> Option<serde_json::Value> {
.map(|(k, v)| {
let key = k
.as_ref()
.map(to_value)
.map(|e| to_value(e, enums))
.flatten()
.and_then(|x| match x {
serde_json::Value::String(s) => Some(s),
_ => None,
})
.unwrap_or_else(|| "no_key".to_string());
(key, to_value(&v))
(key, to_value(&v, enums))
})
.collect::<HashMap<String, _>>();
Some(json!(v))
}
Expr::List(ExprList { elts, .. }) => {
let v = elts.into_iter().map(|x| to_value(&x)).collect::<Vec<_>>();
let v = elts.into_iter().map(|x| to_value(&x, enums)).collect::<Vec<_>>();
Some(json!(v))
}
Expr::Attribute(ExprAttribute { value, attr, .. }) => {
// Handle Enum.MEMBER: returns enum value ("red") not member name ("RED")
if let Expr::Name(ExprName { id: enum_name, .. }) = value.as_ref() {
if let Some(enum_info) = enums.get(enum_name.as_str()) {
if let Some(enum_value) = enum_info.members.get(attr.as_str()) {
return Some(json!(enum_value));
}
}
Some(json!(attr.as_str()))
} else {
None
}
}
Expr::Call { .. } => Some(json!(FUNCTION_CALL)),
_ => None,
}
@@ -751,4 +962,35 @@ def main(a: str, b: Optional[str], c: str | None): return
Ok(())
}
#[test]
fn test_parse_python_sig_enum() -> anyhow::Result<()> {
let code = r#"
from enum import Enum
class Color(str, Enum):
RED = 'red'
GREEN = 'green'
BLUE = 'blue'
def main(color: Color = Color.RED):
"""
Test enum parsing
Args:
color (Color): Color selection from Color enum
"""
return {"color": color}
"#;
let result = parse_python_signature(code, None, false)?;
assert_eq!(result.args.len(), 1);
assert_eq!(result.args[0].name, "color");
assert_eq!(
result.args[0].typ,
Typ::Str(Some(vec!["red".to_string(), "green".to_string(), "blue".to_string()]))
);
assert_eq!(result.args[0].default, Some(json!("red")));
assert_eq!(result.args[0].otyp, Some("Color selection from Color enum".to_string()));
Ok(())
}
}