aaron-ang commented on code in PR #19367: URL: https://github.com/apache/datafusion/pull/19367#discussion_r2671423030
########## datafusion/macros/src/lib.rs: ########## @@ -0,0 +1,131 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +#![doc( + html_logo_url = "https://raw.githubusercontent.com/apache/datafusion/19fe44cf2f30cbdd63d4a4f52c74055163c6cc38/docs/logos/standalone_logo/logo_original.svg";, + html_favicon_url = "https://raw.githubusercontent.com/apache/datafusion/19fe44cf2f30cbdd63d4a4f52c74055163c6cc38/docs/logos/standalone_logo/logo_original.svg"; +)] +#![cfg_attr(docsrs, feature(doc_cfg))] +#![deny(clippy::allow_attributes)] + +extern crate proc_macro; + +mod metric_doc_impl; +mod user_doc_impl; + +use proc_macro::TokenStream; + +/// This procedural macro is intended to parse a rust custom attribute and create user documentation +/// from it by constructing a `DocumentBuilder()` automatically. The `Documentation` can be +/// retrieved from the `documentation()` method +/// declared on `AggregateUDF`, `WindowUDFImpl`, `ScalarUDFImpl` traits. +/// For `doc_section`, this macro will try to find corresponding predefined `DocSection` by label field +/// Predefined `DocSection` can be found in datafusion/expr/src/udf.rs +/// Example: +/// ```ignore +/// #[user_doc( +/// doc_section(label = "Time and Date Functions"), +/// description = r"Converts a value to a date (`YYYY-MM-DD`).", +/// syntax_example = "to_date('2017-05-31', '%Y-%m-%d')", +/// sql_example = r#"```sql +/// > select to_date('2023-01-31'); +/// +-----------------------------+ +/// | to_date(Utf8(\"2023-01-31\")) | +/// +-----------------------------+ +/// | 2023-01-31 | +/// +-----------------------------+ +/// ```"#, +/// standard_argument(name = "expression", prefix = "String"), +/// argument( +/// name = "format_n", +/// description = r"Optional [Chrono format](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) strings to use to parse the expression. Formats will be tried in the order +/// they appear with the first successful one being returned. If none of the formats successfully parse the expression +/// an error will be returned." +/// ) +/// )] +/// #[derive(Debug)] +/// pub struct ToDateFunc { +/// signature: Signature, +/// } +/// ``` +/// will generate the following code +/// ```ignore +/// pub struct ToDateFunc { +/// signature: Signature, +/// } +/// impl ToDateFunc { +/// fn doc(&self) -> Option<&datafusion_doc::Documentation> { +/// static DOCUMENTATION: std::sync::LazyLock< +/// datafusion_doc::Documentation, +/// > = std::sync::LazyLock::new(|| { +/// datafusion_doc::Documentation::builder( +/// datafusion_doc::DocSection { +/// include: true, +/// label: "Time and Date Functions", +/// description: None, +/// }, +/// r"Converts a value to a date (`YYYY-MM-DD`).".to_string(), +/// "to_date('2017-05-31', '%Y-%m-%d')".to_string(), +/// ) +/// .with_sql_example( +/// r#"```sql +/// > select to_date('2023-01-31'); +/// +-----------------------------+ +/// | to_date(Utf8(\"2023-01-31\")) | +/// +-----------------------------+ +/// | 2023-01-31 | +/// +-----------------------------+ +/// ```"#, +/// ) +/// .with_standard_argument("expression", "String".into()) +/// .with_argument( +/// "format_n", +/// r"Optional [Chrono format](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) strings to use to parse the expression. Formats will be tried in the order +/// they appear with the first successful one being returned. If none of the formats successfully parse the expression +/// an error will be returned.", +/// ) +/// .build() +/// }); +/// Some(&DOCUMENTATION) +/// } +/// } +/// ``` +#[proc_macro_attribute] +pub fn user_doc(args: TokenStream, input: TokenStream) -> TokenStream { + user_doc_impl::user_doc(args, input) +} + +/// Helper attribute to register metrics structs or execs for documentation generation. +/// Usage: +/// - `#[metric_doc(common)]` on `*_Metrics` structs (derives `DocumentedMetrics`) +/// - `#[metric_doc(M1, M2)]` on `*_Exec` structs to link metrics (derives `DocumentedExec`) Review Comment: hi @2010YOUY01, I've addressed all your concerns in my recent changes. please take a look :) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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