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// 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.

//! "regx" DataFusion functions

pub mod regexplike;
pub mod regexpmatch;
pub mod regexpreplace;
// create UDFs
make_udf_function!(regexpmatch::RegexpMatchFunc, REGEXP_MATCH, regexp_match);
make_udf_function!(regexplike::RegexpLikeFunc, REGEXP_LIKE, regexp_like);
make_udf_function!(
    regexpreplace::RegexpReplaceFunc,
    REGEXP_REPLACE,
    regexp_replace
);

pub mod expr_fn {
    use datafusion_expr::Expr;

    /// Returns a list of regular expression matches in a string.
    pub fn regexp_match(values: Expr, regex: Expr, flags: Option<Expr>) -> Expr {
        let mut args = vec![values, regex];
        if let Some(flags) = flags {
            args.push(flags);
        };
        super::regexp_match().call(args)
    }

    /// Returns true if a has at least one match in a string, false otherwise.
    pub fn regexp_like(values: Expr, regex: Expr, flags: Option<Expr>) -> Expr {
        let mut args = vec![values, regex];
        if let Some(flags) = flags {
            args.push(flags);
        };
        super::regexp_like().call(args)
    }

    /// Replaces substrings in a string that match.
    pub fn regexp_replace(
        string: Expr,
        pattern: Expr,
        replacement: Expr,
        flags: Option<Expr>,
    ) -> Expr {
        let mut args = vec![string, pattern, replacement];
        if let Some(flags) = flags {
            args.push(flags);
        };
        super::regexp_replace().call(args)
    }
}

#[doc = r" Return a list of all functions in this package"]
pub fn functions() -> Vec<std::sync::Arc<datafusion_expr::ScalarUDF>> {
    vec![regexp_match(), regexp_like(), regexp_replace()]
}