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// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Immutable strings.
pub use core_foundation_sys::string::*;
use base::{CFIndexConvertible, TCFType};
use core_foundation_sys::base::{Boolean, CFIndex, CFRange, CFRelease};
use core_foundation_sys::base::{kCFAllocatorDefault, kCFAllocatorNull};
use std::fmt;
use std::str::{self, FromStr};
use std::ptr;
use std::ffi::CStr;
/// An immutable string in one of a variety of encodings.
pub struct CFString(CFStringRef);
impl Clone for CFString {
#[inline]
fn clone(&self) -> CFString {
unsafe {
TCFType::wrap_under_get_rule(self.0)
}
}
}
impl Drop for CFString {
fn drop(&mut self) {
unsafe {
CFRelease(self.as_CFTypeRef())
}
}
}
impl_TCFType!(CFString, CFStringRef, CFStringGetTypeID);
impl FromStr for CFString {
type Err = ();
/// See also CFString::new for a variant of this which does not return a Result
#[inline]
fn from_str(string: &str) -> Result<CFString, ()> {
Ok(CFString::new(string))
}
}
impl fmt::Display for CFString {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
unsafe {
// Do this without allocating if we can get away with it
let c_string = CFStringGetCStringPtr(self.0, kCFStringEncodingUTF8);
if c_string != ptr::null() {
let c_str = CStr::from_ptr(c_string);
fmt.write_str(str::from_utf8_unchecked(c_str.to_bytes()))
} else {
let char_len = self.char_len();
// First, ask how big the buffer ought to be.
let mut bytes_required: CFIndex = 0;
CFStringGetBytes(self.0,
CFRange { location: 0, length: char_len },
kCFStringEncodingUTF8,
0,
false as Boolean,
ptr::null_mut(),
0,
&mut bytes_required);
// Then, allocate the buffer and actually copy.
let mut buffer = vec![b'\x00'; bytes_required as usize];
let mut bytes_used: CFIndex = 0;
let chars_written = CFStringGetBytes(self.0,
CFRange { location: 0, length: char_len },
kCFStringEncodingUTF8,
0,
false as Boolean,
buffer.as_mut_ptr(),
buffer.len().to_CFIndex(),
&mut bytes_used) as usize;
assert!(chars_written.to_CFIndex() == char_len);
// This is dangerous; we over-allocate and null-terminate the string (during
// initialization).
assert!(bytes_used == buffer.len().to_CFIndex());
fmt.write_str(str::from_utf8_unchecked(&buffer))
}
}
}
}
impl fmt::Debug for CFString {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "\"{}\"", self)
}
}
impl CFString {
/// Creates a new `CFString` instance from a Rust string.
#[inline]
pub fn new(string: &str) -> CFString {
unsafe {
let string_ref = CFStringCreateWithBytes(kCFAllocatorDefault,
string.as_ptr(),
string.len().to_CFIndex(),
kCFStringEncodingUTF8,
false as Boolean,
kCFAllocatorNull);
CFString::wrap_under_create_rule(string_ref)
}
}
/// Like `CFString::new`, but references a string that can be used as a backing store
/// by virtue of being statically allocated.
#[inline]
pub fn from_static_string(string: &'static str) -> CFString {
unsafe {
let string_ref = CFStringCreateWithBytesNoCopy(kCFAllocatorDefault,
string.as_ptr(),
string.len().to_CFIndex(),
kCFStringEncodingUTF8,
false as Boolean,
kCFAllocatorNull);
TCFType::wrap_under_create_rule(string_ref)
}
}
/// Returns the number of characters in the string.
#[inline]
pub fn char_len(&self) -> CFIndex {
unsafe {
CFStringGetLength(self.0)
}
}
}
#[test]
fn string_and_back() {
let original = "The quick brown fox jumped over the slow lazy dog.";
let cfstr = CFString::from_static_string(original);
let converted = cfstr.to_string();
assert!(converted == original);
}