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use proc_macro2::TokenStream;
use quote::quote;
use syn::Field;
use crate::parsers::array_parser::parse_array_literal;
use crate::type_utils::{TypeCategory, get_option_inner_type, get_type_category, is_option_type};
/// Represents parsed field attributes
pub struct FieldAttributes {
pub description: Option<String>,
pub example_value: Option<TokenStream>,
pub examples_array: Vec<TokenStream>,
/// Field rename from #[serde(rename = "...")]
pub serde_rename: Option<String>,
}
/// Parse a single field's llm and serde attributes
pub fn parse_field_attributes(field: &Field) -> FieldAttributes {
let mut description = None;
let mut example_value = None;
let mut examples_array = Vec::new();
let mut serde_rename = None;
// Get the base type (unwrapping Option if present)
let is_optional = is_option_type(&field.ty);
let base_type = if is_optional {
get_option_inner_type(&field.ty)
} else {
&field.ty
};
// Extract attributes
for attr in &field.attrs {
// Parse serde attributes for rename
if attr.path().is_ident("serde") {
let _ = attr.parse_nested_meta(|meta| {
if meta.path.is_ident("rename") {
let value = meta.value()?;
let content: syn::LitStr = value.parse()?;
serde_rename = Some(content.value());
}
Ok(())
});
}
if attr.path().is_ident("llm") {
// Parse attribute arguments
let _result = attr.parse_nested_meta(|meta| {
if meta.path.is_ident("description") {
let value = meta.value()?;
let content: syn::LitStr = value.parse()?;
description = Some(content.value());
} else if meta.path.is_ident("example") {
let value = meta.value()?;
// First, try to parse as an array literal for array types
if let TypeCategory::Array = get_type_category(base_type) {
// Try to parse as an array literal
if let Some(array_tokens) = parse_array_literal(value) {
example_value = Some(quote! {
::serde_json::Value::Array(vec![#(#array_tokens),*])
});
return Ok(());
}
}
// If not an array literal or not an array type, parse based on field type
match get_type_category(base_type) {
TypeCategory::String => {
let content: syn::LitStr = value.parse()?;
example_value = Some(quote! {
::serde_json::Value::String(#content.to_string())
});
},
TypeCategory::Integer => {
if let Ok(content) = value.parse::<syn::LitInt>() {
example_value = Some(quote! {
::serde_json::Value::Number(::serde_json::Number::from(#content))
});
} else if let Ok(content) = value.parse::<syn::LitStr>() {
// Allow string for integer too
let int_str = content.value();
example_value = Some(quote! {
match #int_str.parse::<i64>() {
Ok(num) => ::serde_json::Value::Number(::serde_json::Number::from(num)),
Err(_) => ::serde_json::Value::String(#int_str.to_string())
}
});
}
},
TypeCategory::Float => {
if let Ok(content) = value.parse::<syn::LitFloat>() {
let float_str = content.to_string();
example_value = Some(quote! {
match #float_str.parse::<f64>() {
Ok(num) => ::serde_json::json!(num),
Err(_) => ::serde_json::Value::String(#float_str.to_string())
}
});
} else if let Ok(content) = value.parse::<syn::LitStr>() {
// Allow string for float too
let float_str = content.value();
example_value = Some(quote! {
match #float_str.parse::<f64>() {
Ok(num) => ::serde_json::json!(num),
Err(_) => ::serde_json::Value::String(#float_str.to_string())
}
});
}
},
TypeCategory::Boolean => {
if let Ok(content) = value.parse::<syn::LitBool>() {
let bool_val = content.value;
example_value = Some(quote! {
::serde_json::Value::Bool(#bool_val)
});
} else if let Ok(content) = value.parse::<syn::LitStr>() {
// Allow string for boolean too
let bool_str = content.value();
example_value = Some(quote! {
match #bool_str.parse::<bool>() {
Ok(val) => ::serde_json::Value::Bool(val),
Err(_) => ::serde_json::Value::String(#bool_str.to_string())
}
});
}
},
TypeCategory::Array => {
// For array types, we need to handle the special array syntax
// Parse the attribute value as a string first
if let Ok(content) = value.parse::<syn::LitStr>() {
let array_str = content.value();
// Check if it's a bracketed array like ["a", "b", "c"]
if array_str.starts_with('[') && array_str.ends_with(']') {
// Parse as JSON array, but convert single quotes to double quotes
let json_array = array_str.replace('\'', "\"");
example_value = Some(quote! {
match ::serde_json::from_str(#json_array) {
Ok(val) => val,
Err(_) => ::serde_json::Value::String(#array_str.to_string())
}
});
} else {
// Treat as a single string
example_value = Some(quote! {
::serde_json::Value::Array(vec![::serde_json::Value::String(#array_str.to_string())])
});
}
}
},
TypeCategory::Object => {
// For object types, parse as JSON string
if let Ok(content) = value.parse::<syn::LitStr>() {
let json_str = content.value();
example_value = Some(quote! {
match ::serde_json::from_str(#json_str) {
Ok(val) => val,
Err(_) => ::serde_json::Value::String(#json_str.to_string())
}
});
}
}
}
} else if meta.path.is_ident("examples") {
// First, try to parse as an array literal
let value = meta.value()?;
if let Some(array_tokens) = parse_array_literal(value) {
// Use the parsed array tokens directly
examples_array = array_tokens;
return Ok(());
}
// If not an array literal, handle examples based on type
match get_type_category(base_type) {
TypeCategory::String => {
// Parse array of string literals for string types
meta.parse_nested_meta(|nested_meta| {
if let Ok(lit_str) = nested_meta.value()?.parse::<syn::LitStr>() {
let value = lit_str.value();
examples_array.push(quote! {
::serde_json::Value::String(#value.to_string())
});
}
Ok(())
})?;
},
TypeCategory::Integer => {
// Parse array of integer literals
meta.parse_nested_meta(|nested_meta| {
if let Ok(lit_int) = nested_meta.value()?.parse::<syn::LitInt>() {
examples_array.push(quote! {
::serde_json::Value::Number(::serde_json::Number::from(#lit_int))
});
} else if let Ok(lit_str) = nested_meta.value()?.parse::<syn::LitStr>() {
let value = lit_str.value();
examples_array.push(quote! {
match #value.parse::<i64>() {
Ok(num) => ::serde_json::Value::Number(::serde_json::Number::from(num)),
Err(_) => ::serde_json::Value::String(#value.to_string())
}
});
}
Ok(())
})?;
},
TypeCategory::Float => {
// Parse array of float literals
meta.parse_nested_meta(|nested_meta| {
if let Ok(lit_float) = nested_meta.value()?.parse::<syn::LitFloat>() {
let value = lit_float.to_string();
examples_array.push(quote! {
match #value.parse::<f64>() {
Ok(num) => ::serde_json::json!(num),
Err(_) => ::serde_json::Value::String(#value.to_string())
}
});
} else if let Ok(lit_str) = nested_meta.value()?.parse::<syn::LitStr>() {
let value = lit_str.value();
examples_array.push(quote! {
match #value.parse::<f64>() {
Ok(num) => ::serde_json::json!(num),
Err(_) => ::serde_json::Value::String(#value.to_string())
}
});
}
Ok(())
})?;
},
TypeCategory::Boolean => {
// Parse array of boolean literals
meta.parse_nested_meta(|nested_meta| {
if let Ok(lit_bool) = nested_meta.value()?.parse::<syn::LitBool>() {
let value = lit_bool.value;
examples_array.push(quote! {
::serde_json::Value::Bool(#value)
});
} else if let Ok(lit_str) = nested_meta.value()?.parse::<syn::LitStr>() {
let value = lit_str.value();
examples_array.push(quote! {
match #value.parse::<bool>() {
Ok(val) => ::serde_json::Value::Bool(val),
Err(_) => ::serde_json::Value::String(#value.to_string())
}
});
}
Ok(())
})?;
},
TypeCategory::Array | TypeCategory::Object => {
// For arrays and objects, accept a JSON string
let value = meta.value()?;
let content: syn::LitStr = value.parse()?;
let json_str = content.value();
examples_array.push(quote! {
match ::serde_json::from_str::<::serde_json::Value>(#json_str) {
Ok(val) => val,
Err(_) => ::serde_json::Value::String(#json_str.to_string())
}
});
}
}
}
Ok(())
});
}
}
FieldAttributes {
description,
example_value,
examples_array,
serde_rename,
}
}