/* Copyright 2018 Mozilla Foundation

 *

 * 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 super::{

    BinaryReader, Range, Result, SectionIteratorLimited, SectionReader, SectionWithLimitedItems,

    TableType,

};

#[derive(Clone)]

pub struct TableSectionReader<'a> {

    reader: BinaryReader<'a>,

    count: u32,

}

impl<'a> TableSectionReader<'a> {

    pub fn new(data: &'a [u8], offset: usize) -> Result<TableSectionReader<'a>> {

        let mut reader = BinaryReader::new_with_offset(data, offset);

        let count = reader.read_var_u32()?;

        Ok(TableSectionReader { reader, count })

    }

    pub fn original_position(&self) -> usize {

        self.reader.original_position()

    }

    pub fn get_count(&self) -> u32 {

        self.count

    }

    /// Reads content of the table section.

    ///

    /// # Examples

    /// ```

    /// use wasmparser::TableSectionReader;

    ///

    /// # let data: &[u8] = &[0x01, 0x70, 0x01, 0x01, 0x01];

    /// let mut table_reader = TableSectionReader::new(data, 0).unwrap();

    /// for _ in 0..table_reader.get_count() {

    ///     let table = table_reader.read().expect("table");

    ///     println!("Table: {:?}", table);

    /// }

    /// ```

    pub fn read(&mut self) -> Result<TableType> {

        self.reader.read_table_type()

    }

}

impl<'a> SectionReader for TableSectionReader<'a> {

    type Item = TableType;

    fn read(&mut self) -> Result<Self::Item> {

        TableSectionReader::read(self)

    }

    fn eof(&self) -> bool {

        self.reader.eof()

    }

    fn original_position(&self) -> usize {

        TableSectionReader::original_position(self)

    }

    fn range(&self) -> Range {

        self.reader.range()

    }

}

impl<'a> SectionWithLimitedItems for TableSectionReader<'a> {

    fn get_count(&self) -> u32 {

        TableSectionReader::get_count(self)

    }

}

impl<'a> IntoIterator for TableSectionReader<'a> {

    type Item = Result<TableType>;

    type IntoIter = SectionIteratorLimited<TableSectionReader<'a>>;

    fn into_iter(self) -> Self::IntoIter {

        SectionIteratorLimited::new(self)

    }

}