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use fallible_iterator::{FallibleIterator, FromFallibleIterator};
use std::ascii::AsciiExt;
use std::ops::Range;
use stmt::Column;
pub trait RowIndex {
fn idx(&self, stmt: &[Column]) -> Option<usize>;
}
impl RowIndex for usize {
#[inline]
fn idx(&self, stmt: &[Column]) -> Option<usize> {
if *self >= stmt.len() {
None
} else {
Some(*self)
}
}
}
impl<'a> RowIndex for str {
#[inline]
fn idx(&self, stmt: &[Column]) -> Option<usize> {
if let Some(idx) = stmt.iter().position(|d| d.name() == self) {
return Some(idx);
};
stmt.iter().position(|d| d.name().eq_ignore_ascii_case(self))
}
}
impl<'a, T: ?Sized> RowIndex for &'a T
where T: RowIndex
{
#[inline]
fn idx(&self, columns: &[Column]) -> Option<usize> {
T::idx(*self, columns)
}
}
#[doc(hidden)]
pub struct RowData {
buf: Vec<u8>,
indices: Vec<Option<Range<usize>>>,
}
impl<'a> FromFallibleIterator<Option<&'a [u8]>> for RowData {
fn from_fallible_iterator<I>(mut it: I) -> Result<RowData, I::Error>
where I: FallibleIterator<Item = Option<&'a [u8]>>
{
let mut row = RowData {
buf: vec![],
indices: Vec::with_capacity(it.size_hint().0),
};
while let Some(cell) = it.next()? {
let index = match cell {
Some(cell) => {
let base = row.buf.len();
row.buf.extend_from_slice(cell);
Some(base..row.buf.len())
}
None => None,
};
row.indices.push(index);
}
Ok(row)
}
}
impl RowData {
pub fn len(&self) -> usize {
self.indices.len()
}
pub fn get(&self, index: usize) -> Option<&[u8]> {
match &self.indices[index] {
&Some(ref range) => Some(&self.buf[range.clone()]),
&None => None,
}
}
}