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// Licensed 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.

use crate::dialect::Dialect;

/// A [`Dialect`] for [Google Bigquery](https://cloud.google.com/bigquery/)
#[derive(Debug, Default)]
pub struct BigQueryDialect;

impl Dialect for BigQueryDialect {
    // See https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical#identifiers
    fn is_delimited_identifier_start(&self, ch: char) -> bool {
        ch == '`'
    }

    fn is_identifier_start(&self, ch: char) -> bool {
        ch.is_ascii_lowercase() || ch.is_ascii_uppercase() || ch == '_'
    }

    fn is_identifier_part(&self, ch: char) -> bool {
        ch.is_ascii_lowercase() || ch.is_ascii_uppercase() || ch.is_ascii_digit() || ch == '_'
    }

    /// See [doc](https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical#quoted_literals)
    fn supports_triple_quoted_string(&self) -> bool {
        true
    }

    /// See [doc](https://cloud.google.com/bigquery/docs/reference/standard-sql/navigation_functions#first_value)
    fn supports_window_function_null_treatment_arg(&self) -> bool {
        true
    }

    // See https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical#escape_sequences
    fn supports_string_literal_backslash_escape(&self) -> bool {
        true
    }

    /// See [doc](https://cloud.google.com/bigquery/docs/reference/standard-sql/window-function-calls#ref_named_window)
    fn supports_window_clause_named_window_reference(&self) -> bool {
        true
    }

    /// See [doc](https://cloud.google.com/bigquery/docs/reference/standard-sql/procedural-language#set)
    fn supports_parenthesized_set_variables(&self) -> bool {
        true
    }

    // See https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#select_except
    fn supports_select_wildcard_except(&self) -> bool {
        true
    }
}