124 lines
2.8 KiB
Rust
124 lines
2.8 KiB
Rust
#![allow(unknown_lints)] // for clippy
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extern crate hex;
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extern crate fallible_iterator;
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extern crate phf;
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extern crate postgres_protocol;
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use fallible_iterator::{FallibleIterator, FromFallibleIterator};
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use std::ascii::AsciiExt;
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use std::ops::Range;
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use types::Type;
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pub mod error;
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pub mod params;
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pub mod types;
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pub struct RowData {
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buf: Vec<u8>,
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indices: Vec<Option<Range<usize>>>,
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}
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impl<'a> FromFallibleIterator<Option<&'a [u8]>> for RowData {
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fn from_fallible_iterator<I>(mut it: I) -> Result<RowData, I::Error>
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where I: FallibleIterator<Item = Option<&'a [u8]>>
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{
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let mut row = RowData {
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buf: vec![],
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indices: Vec::with_capacity(it.size_hint().0),
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};
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while let Some(cell) = try!(it.next()) {
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let index = match cell {
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Some(cell) => {
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let base = row.buf.len();
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row.buf.extend_from_slice(cell);
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Some(base..row.buf.len())
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}
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None => None,
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};
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row.indices.push(index);
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}
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Ok(row)
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}
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}
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impl RowData {
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pub fn len(&self) -> usize {
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self.indices.len()
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}
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pub fn get(&self, index: usize) -> Option<&[u8]> {
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match &self.indices[index] {
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&Some(ref range) => Some(&self.buf[range.clone()]),
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&None => None,
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}
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}
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}
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pub struct Column {
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name: String,
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type_: Type,
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}
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impl Column {
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#[doc(hidden)]
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pub fn new(name: String, type_: Type) -> Column {
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Column {
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name: name,
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type_: type_,
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}
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}
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pub fn name(&self) -> &str {
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&self.name
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}
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pub fn type_(&self) -> &Type {
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&self.type_
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}
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}
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/// A trait implemented by types that can index into columns of a row.
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pub trait RowIndex {
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/// Returns the index of the appropriate column, or `None` if no such
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/// column exists.
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fn idx(&self, stmt: &[Column]) -> Option<usize>;
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}
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impl RowIndex for usize {
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#[inline]
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fn idx(&self, stmt: &[Column]) -> Option<usize> {
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if *self >= stmt.len() {
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None
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} else {
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Some(*self)
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}
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}
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}
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impl<'a> RowIndex for str {
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#[inline]
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fn idx(&self, stmt: &[Column]) -> Option<usize> {
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if let Some(idx) = stmt.iter().position(|d| d.name() == self) {
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return Some(idx);
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};
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// FIXME ASCII-only case insensitivity isn't really the right thing to
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// do. Postgres itself uses a dubious wrapper around tolower and JDBC
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// uses the US locale.
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stmt.iter().position(|d| d.name().eq_ignore_ascii_case(self))
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}
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}
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impl<'a, T> RowIndex for &'a T
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where T: RowIndex
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{
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#[inline]
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fn idx(&self, columns: &[Column]) -> Option<usize> {
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T::idx(*self, columns)
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}
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}
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