Files
adler32
ahash
aho_corasick
alga
alga_derive
alsa_sys
amethyst
amethyst_animation
amethyst_assets
amethyst_audio
amethyst_config
amethyst_controls
amethyst_core
amethyst_derive
amethyst_error
amethyst_input
amethyst_locale
amethyst_network
amethyst_rendy
amethyst_ui
amethyst_utils
amethyst_window
andrew
approx
arrayvec
ash
atom
atty
backtrace
backtrace_sys
base64
bincode
bitflags
byteorder
bytes
c2_chacha
cfg_if
cgmath
chrono
claxon
clipboard
color_quant
colored
colorful
const_random
const_random_macro
cookie
cookie_store
cpal
crc
crc32fast
crossbeam_channel
crossbeam_deque
crossbeam_epoch
crossbeam_queue
crossbeam_utils
ctor
debugid
deflate
derivative
derive_new
dirs
dlib
downcast_rs
dtoa
edit_distance
either
encoding_rs
env_logger
erased_serde
err_derive
error_chain
euclid
euclid_macros
expat_sys
failure
failure_derive
fern
flate2
float_ord
fluent
fluent_bundle
fluent_locale
fluent_syntax
fnv
font_kit
fontconfig
fontconfig_sys
foreign_types
foreign_types_shared
freetype
freetype_sys
futures
futures_cpupool
fxhash
generic_array
genmesh
getrandom
getset
gfx_backend_vulkan
gfx_hal
ghost
gif
glsl_layout
glsl_layout_derive
glyph_brush
glyph_brush_layout
h2
hashbrown
heck
hibitset
hostname
hound
http
http_body
httparse
httpdate
humantime
hyper
hyper_tls
idna
im
image
indexmap
inflate
intl_pluralrules
inventory
inventory_impl
iovec
itertools
itoa
jpeg_decoder
laminar
lazy_static
lewton
lexical
lexical_core
libc
libloading
libm
line_drawing
linked_hash_map
lock_api
log
lyon_geom
lyon_path
lzw
matches
matrixmultiply
maybe_uninit
memchr
memmap
memoffset
mime
mime_guess
minimp3
minimp3_sys
miniz_oxide
mint
minterpolate
mio
mopa
nalgebra
base
geometry
linalg
native_tls
net2
nix
nodrop
num
num_bigint
num_complex
num_cpus
num_derive
num_integer
num_iter
num_rational
num_traits
objekt
ogg
openssl
openssl_probe
openssl_sys
ordered_float
owning_ref
palette
palette_derive
parking_lot
parking_lot_core
paste
paste_impl
percent_encoding
phf
phf_shared
png
ppv_lite86
proc_macro2
proc_macro_hack
proc_macro_roids
publicsuffix
quick_error
quickcheck
quote
rand
rand_chacha
rand_core
rand_hc
rand_isaac
rand_jitter
rand_os
rand_pcg
rand_xorshift
rawpointer
rayon
rayon_core
regex
regex_syntax
relevant
rendy
rendy_chain
rendy_command
rendy_descriptor
rendy_factory
rendy_frame
rendy_graph
rendy_memory
rendy_mesh
rendy_resource
rendy_shader
rendy_texture
rendy_util
rendy_wsi
rental
rental_impl
reqwest
rgb
rodio
ron
rustc_demangle
rustc_hash
rustc_version
rustc_version_runtime
rusttype
ryu
same_file
scoped_threadpool
scopeguard
semver
semver_parser
sentry
sentry_types
serde
serde_bytes
serde_derive
serde_json
serde_urlencoded
shared_library
shred
shred_derive
shrev
singularity_rs
siphasher
sized_chunks
slab
slice_deque
smallvec
smithay_client_toolkit
specs
specs_derive
specs_hierarchy
stable_deref_trait
stackvector
static_assertions
stb_truetype
string
syn
synstructure
termcolor
thread_local
thread_profiler
tiff
time
tokio
tokio_buf
tokio_current_thread
tokio_executor
tokio_io
tokio_reactor
tokio_sync
tokio_tcp
tokio_threadpool
tokio_timer
try_from
try_lock
tuple_utils
twox_hash
typenum
uname
unic_langid
unic_langid_impl
unic_langid_macros
unic_langid_macros_impl
unicase
unicode_bidi
unicode_normalization
unicode_segmentation
unicode_xid
unreachable
url
url_serde
uuid
void
walkdir
want
wavefront_obj
wayland_client
wayland_commons
wayland_protocols
wayland_sys
winapi
winconsole
winit
x11
x11_clipboard
x11_dl
xcb
xdg
xi_unicode
xml
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
// Copyright 2013-2016 The rust-url developers.
//
// 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.

//! Parser and serializer for the [`application/x-www-form-urlencoded` syntax](
//! http://url.spec.whatwg.org/#application/x-www-form-urlencoded),
//! as used by HTML forms.
//!
//! Converts between a string (such as an URL’s query string)
//! and a sequence of (name, value) pairs.

use encoding::EncodingOverride;
use percent_encoding::{percent_encode_byte, percent_decode};
use std::borrow::{Borrow, Cow};
use std::fmt;
use std::str;


/// Convert a byte string in the `application/x-www-form-urlencoded` syntax
/// into a iterator of (name, value) pairs.
///
/// Use `parse(input.as_bytes())` to parse a `&str` string.
///
/// The names and values are percent-decoded. For instance, `%23first=%25try%25` will be
/// converted to `[("#first", "%try%")]`.
#[inline]
pub fn parse(input: &[u8]) -> Parse {
    Parse {
        input: input,
        encoding: EncodingOverride::utf8(),
    }
}


/// Convert a byte string in the `application/x-www-form-urlencoded` syntax
/// into a iterator of (name, value) pairs.
///
/// Use `parse(input.as_bytes())` to parse a `&str` string.
///
/// This function is only available if the `query_encoding`
/// [feature](http://doc.crates.io/manifest.html#the-features-section]) is enabled.
///
/// Arguments:
///
/// * `encoding_override`: The character encoding each name and values is decoded as
///    after percent-decoding. Defaults to UTF-8.
///    `EncodingRef` is defined in [rust-encoding](https://github.com/lifthrasiir/rust-encoding).
/// * `use_charset`: The *use _charset_ flag*. If in doubt, set to `false`.
#[cfg(feature = "query_encoding")]
pub fn parse_with_encoding<'a>(input: &'a [u8],
                               encoding_override: Option<::encoding::EncodingRef>,
                               use_charset: bool)
                               -> Result<Parse<'a>, ()> {
    use std::ascii::AsciiExt;

    let mut encoding = EncodingOverride::from_opt_encoding(encoding_override);
    if !(encoding.is_utf8() || input.is_ascii()) {
        return Err(())
    }
    if use_charset {
        for sequence in input.split(|&b| b == b'&') {
            // No '+' in "_charset_" to replace with ' '.
            if sequence.starts_with(b"_charset_=") {
                let value = &sequence[b"_charset_=".len()..];
                // Skip replacing '+' with ' ' in value since no encoding label contains either:
                // https://encoding.spec.whatwg.org/#names-and-labels
                if let Some(e) = EncodingOverride::lookup(value) {
                    encoding = e;
                    break
                }
            }
        }
    }
    Ok(Parse {
        input: input,
        encoding: encoding,
    })
}

/// The return type of `parse()`.
#[derive(Copy, Clone, Debug)]
pub struct Parse<'a> {
    input: &'a [u8],
    encoding: EncodingOverride,
}

impl<'a> Iterator for Parse<'a> {
    type Item = (Cow<'a, str>, Cow<'a, str>);

    fn next(&mut self) -> Option<Self::Item> {
        loop {
            if self.input.is_empty() {
                return None
            }
            let mut split2 = self.input.splitn(2, |&b| b == b'&');
            let sequence = split2.next().unwrap();
            self.input = split2.next().unwrap_or(&[][..]);
            if sequence.is_empty() {
                continue
            }
            let mut split2 = sequence.splitn(2, |&b| b == b'=');
            let name = split2.next().unwrap();
            let value = split2.next().unwrap_or(&[][..]);
            return Some((
                decode(name, self.encoding),
                decode(value, self.encoding),
            ))
        }
    }
}

fn decode(input: &[u8], encoding: EncodingOverride) -> Cow<str> {
    let replaced = replace_plus(input);
    encoding.decode(match percent_decode(&replaced).if_any() {
        Some(vec) => Cow::Owned(vec),
        None => replaced,
    })
}

/// Replace b'+' with b' '
fn replace_plus(input: &[u8]) -> Cow<[u8]> {
    match input.iter().position(|&b| b == b'+') {
        None => Cow::Borrowed(input),
        Some(first_position) => {
            let mut replaced = input.to_owned();
            replaced[first_position] = b' ';
            for byte in &mut replaced[first_position + 1..] {
                if *byte == b'+' {
                    *byte = b' ';
                }
            }
            Cow::Owned(replaced)
        }
    }
}

impl<'a> Parse<'a> {
    /// Return a new iterator that yields pairs of `String` instead of pairs of `Cow<str>`.
    pub fn into_owned(self) -> ParseIntoOwned<'a> {
        ParseIntoOwned { inner: self }
    }
}

/// Like `Parse`, but yields pairs of `String` instead of pairs of `Cow<str>`.
#[derive(Debug)]
pub struct ParseIntoOwned<'a> {
    inner: Parse<'a>
}

impl<'a> Iterator for ParseIntoOwned<'a> {
    type Item = (String, String);

    fn next(&mut self) -> Option<Self::Item> {
        self.inner.next().map(|(k, v)| (k.into_owned(), v.into_owned()))
    }
}

/// The [`application/x-www-form-urlencoded` byte serializer](
/// https://url.spec.whatwg.org/#concept-urlencoded-byte-serializer).
///
/// Return an iterator of `&str` slices.
pub fn byte_serialize(input: &[u8]) -> ByteSerialize {
    ByteSerialize {
        bytes: input,
    }
}

/// Return value of `byte_serialize()`.
#[derive(Debug)]
pub struct ByteSerialize<'a> {
    bytes: &'a [u8],
}

fn byte_serialized_unchanged(byte: u8) -> bool {
    matches!(byte, b'*' | b'-' | b'.' | b'0' ... b'9' | b'A' ... b'Z' | b'_' | b'a' ... b'z')
}

impl<'a> Iterator for ByteSerialize<'a> {
    type Item = &'a str;

    fn next(&mut self) -> Option<&'a str> {
        if let Some((&first, tail)) = self.bytes.split_first() {
            if !byte_serialized_unchanged(first) {
                self.bytes = tail;
                return Some(if first == b' ' { "+" } else { percent_encode_byte(first) })
            }
            let position = tail.iter().position(|&b| !byte_serialized_unchanged(b));
            let (unchanged_slice, remaining) = match position {
                // 1 for first_byte + i unchanged in tail
                Some(i) => self.bytes.split_at(1 + i),
                None => (self.bytes, &[][..]),
            };
            self.bytes = remaining;
            Some(unsafe { str::from_utf8_unchecked(unchanged_slice) })
        } else {
            None
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        if self.bytes.is_empty() {
            (0, Some(0))
        } else {
            (1, Some(self.bytes.len()))
        }
    }
}

/// The [`application/x-www-form-urlencoded` serializer](
/// https://url.spec.whatwg.org/#concept-urlencoded-serializer).
#[derive(Debug)]
pub struct Serializer<T: Target> {
    target: Option<T>,
    start_position: usize,
    encoding: EncodingOverride,
    custom_encoding: Option<SilentDebug<Box<FnMut(&str) -> Cow<[u8]>>>>,
}

struct SilentDebug<T>(T);

impl<T> fmt::Debug for SilentDebug<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("…")
    }
}

pub trait Target {
    fn as_mut_string(&mut self) -> &mut String;
    fn finish(self) -> Self::Finished;
    type Finished;
}

impl Target for String {
    fn as_mut_string(&mut self) -> &mut String { self }
    fn finish(self) -> Self { self }
    type Finished = Self;
}

impl<'a> Target for &'a mut String {
    fn as_mut_string(&mut self) -> &mut String { &mut **self }
    fn finish(self) -> Self { self }
    type Finished = Self;
}

// `as_mut_string` string here exposes the internal serialization of an `Url`,
// which should not be exposed to users.
// We achieve that by not giving users direct access to `UrlQuery`:
// * Its fields are private
//   (and so can not be constructed with struct literal syntax outside of this crate),
// * It has no constructor
// * It is only visible (on the type level) to users in the return type of
//   `Url::query_pairs_mut` which is `Serializer<UrlQuery>`
// * `Serializer` keeps its target in a private field
// * Unlike in other `Target` impls, `UrlQuery::finished` does not return `Self`.
impl<'a> Target for ::UrlQuery<'a> {
    fn as_mut_string(&mut self) -> &mut String {
        &mut self.url.as_mut().unwrap().serialization
    }

    fn finish(mut self) -> &'a mut ::Url {
        let url = self.url.take().unwrap();
        url.restore_already_parsed_fragment(self.fragment.take());
        url
    }

    type Finished = &'a mut ::Url;
}

impl<T: Target> Serializer<T> {
    /// Create a new `application/x-www-form-urlencoded` serializer for the given target.
    ///
    /// If the target is non-empty,
    /// its content is assumed to already be in `application/x-www-form-urlencoded` syntax.
    pub fn new(target: T) -> Self {
        Self::for_suffix(target, 0)
    }

    /// Create a new `application/x-www-form-urlencoded` serializer
    /// for a suffix of the given target.
    ///
    /// If that suffix is non-empty,
    /// its content is assumed to already be in `application/x-www-form-urlencoded` syntax.
    pub fn for_suffix(mut target: T, start_position: usize) -> Self {
        &target.as_mut_string()[start_position..];  // Panic if out of bounds
        Serializer {
            target: Some(target),
            start_position: start_position,
            encoding: EncodingOverride::utf8(),
            custom_encoding: None,
        }
    }

    /// Remove any existing name/value pair.
    ///
    /// Panics if called after `.finish()`.
    pub fn clear(&mut self) -> &mut Self {
        string(&mut self.target).truncate(self.start_position);
        self
    }

    /// Set the character encoding to be used for names and values before percent-encoding.
    #[cfg(feature = "query_encoding")]
    pub fn encoding_override(&mut self, new: Option<::encoding::EncodingRef>) -> &mut Self {
        self.encoding = EncodingOverride::from_opt_encoding(new).to_output_encoding();
        self
    }

    /// Set the character encoding to be used for names and values before percent-encoding.
    pub fn custom_encoding_override<F>(&mut self, encode: F) -> &mut Self
        where F: FnMut(&str) -> Cow<[u8]> + 'static
    {
        self.custom_encoding = Some(SilentDebug(Box::new(encode)));
        self
    }

    /// Serialize and append a name/value pair.
    ///
    /// Panics if called after `.finish()`.
    pub fn append_pair(&mut self, name: &str, value: &str) -> &mut Self {
        append_pair(string(&mut self.target), self.start_position, self.encoding,
                    &mut self.custom_encoding, name, value);
        self
    }

    /// Serialize and append a number of name/value pairs.
    ///
    /// This simply calls `append_pair` repeatedly.
    /// This can be more convenient, so the user doesn’t need to introduce a block
    /// to limit the scope of `Serializer`’s borrow of its string.
    ///
    /// Panics if called after `.finish()`.
    pub fn extend_pairs<I, K, V>(&mut self, iter: I) -> &mut Self
    where I: IntoIterator, I::Item: Borrow<(K, V)>, K: AsRef<str>, V: AsRef<str> {
        {
            let string = string(&mut self.target);
            for pair in iter {
                let &(ref k, ref v) = pair.borrow();
                append_pair(string, self.start_position, self.encoding,
                            &mut self.custom_encoding, k.as_ref(), v.as_ref());
            }
        }
        self
    }

    /// Add a name/value pair whose name is `_charset_`
    /// and whose value is the character encoding’s name.
    /// (See the `encoding_override()` method.)
    ///
    /// Panics if called after `.finish()`.
    #[cfg(feature = "query_encoding")]
    pub fn append_charset(&mut self) -> &mut Self {
        assert!(self.custom_encoding.is_none(),
                "Cannot use both custom_encoding_override() and append_charset()");
        {
            let string = string(&mut self.target);
            append_separator_if_needed(string, self.start_position);
            string.push_str("_charset_=");
            string.push_str(self.encoding.name());
        }
        self
    }

    /// If this serializer was constructed with a string, take and return that string.
    ///
    /// ```rust
    /// use url::form_urlencoded;
    /// let encoded: String = form_urlencoded::Serializer::new(String::new())
    ///     .append_pair("foo", "bar & baz")
    ///     .append_pair("saison", "Été+hiver")
    ///     .finish();
    /// assert_eq!(encoded, "foo=bar+%26+baz&saison=%C3%89t%C3%A9%2Bhiver");
    /// ```
    ///
    /// Panics if called more than once.
    pub fn finish(&mut self) -> T::Finished {
        self.target.take().expect("url::form_urlencoded::Serializer double finish").finish()
    }
}

fn append_separator_if_needed(string: &mut String, start_position: usize) {
    if string.len() > start_position {
        string.push('&')
    }
}

fn string<T: Target>(target: &mut Option<T>) -> &mut String {
    target.as_mut().expect("url::form_urlencoded::Serializer finished").as_mut_string()
}

fn append_pair(string: &mut String, start_position: usize, encoding: EncodingOverride,
               custom_encoding: &mut Option<SilentDebug<Box<FnMut(&str) -> Cow<[u8]>>>>,
               name: &str, value: &str) {
    append_separator_if_needed(string, start_position);
    append_encoded(name, string, encoding, custom_encoding);
    string.push('=');
    append_encoded(value, string, encoding, custom_encoding);
}

fn append_encoded(s: &str, string: &mut String, encoding: EncodingOverride,
               custom_encoding: &mut Option<SilentDebug<Box<FnMut(&str) -> Cow<[u8]>>>>) {
    let bytes = if let Some(SilentDebug(ref mut custom)) = *custom_encoding {
        custom(s)
    } else {
        encoding.encode(s.into())
    };
    string.extend(byte_serialize(&bytes));
}