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use alloc::{borrow::Cow, string::String, vec::Vec};
use core::str::from_utf8_unchecked;
#[cfg(feature = "std")]
use std::io::{self, Write};
macro_rules! parse_script {
(@eof $step:ident, $b:block) => {
// The text ends right after `<\/script`.
if $step == 9 {
$b
}
};
($e:expr, $step:ident, $b:block, $bc:block) => {
match $step {
0 => match $e {
b'<' => $step = 1,
_ => (),
},
1 => match $e {
b'\\' => $step = 2,
b'<' => $step = 1,
_ => $step = 0,
},
2 => match $e {
b'/' => $step = 3,
b'!' => $step = 10,
b'<' => $step = 1,
_ => $step = 0,
},
3 => match $e {
b's' | b'S' => $step = 4,
b'<' => $step = 1,
_ => $step = 0,
},
4 => match $e {
b'c' | b'C' => $step = 5,
b'<' => $step = 1,
_ => $step = 0,
},
5 => match $e {
b'r' | b'R' => $step = 6,
b'<' => $step = 1,
_ => $step = 0,
},
6 => match $e {
b'i' | b'I' => $step = 7,
b'<' => $step = 1,
_ => $step = 0,
},
7 => match $e {
b'p' | b'P' => $step = 8,
b'<' => $step = 1,
_ => $step = 0,
},
8 => match $e {
b't' | b'T' => $step = 9,
b'<' => $step = 1,
_ => $step = 0,
},
9 => match $e {
b'/' | b'>' | 9..=13 | 28..=32 => {
$step = 0;
$b
},
b'<' => $step = 1,
_ => $step = 0,
},
10 => match $e {
b'-' => $step = 11,
b'<' => $step = 1,
_ => $step = 0,
},
11 => match $e {
b'-' => {
$step = 0;
$bc
},
b'<' => $step = 1,
_ => $step = 0,
},
_ => unreachable!(),
}
};
}
decode_impl! {
7;
/// The following substring is unescaped:
///
/// * `<\/script>` => `</script>`
/// * `<\!--` => `<!--`
///
/// `<\/script` at the end of the text is also unescaped.
/// This only removes the listed escapes and does not parse JavaScript.
/// Existing escapes in the original text may also be removed, so encoding and decoding may not return the original text.
parse_script;
/// Decode text from the `<script>` element.
decode_script;
/// Write text from the `<script>` element to a mutable `String` reference and return the decoded string slice.
decode_script_to_string;
/// Write text from the `<script>` element to a mutable `Vec<u8>` reference and return the decoded data slice.
decode_script_to_vec;
/// Write text from the `<script>` element to a writer.
decode_script_to_writer;
}
decode_impl! {
quoted false, true, false;
/// Escapes emitted by the matching encoder are decoded.
/// Hex escapes use `\xHH` with uppercase digits; only escaped C0 controls and `<` are decoded.
/// `\u2028` and `\u2029` are also decoded.
/// Backslashes and `'` escaped with a backslash are decoded.
/// Legacy `<\/script>` and `<\!--` escapes are also decoded.
/// Unknown or incomplete escapes are kept, and decoded text is not decoded again.
raw_text;
/// Decode content of a single-quoted JavaScript string from `<script>`.
decode_script_single_quoted_text;
/// Decode content of a single-quoted JavaScript string to a mutable `String` and return the new string slice.
decode_script_single_quoted_text_to_string;
/// Decode content of a single-quoted JavaScript string to a mutable `Vec<u8>` and return the new data slice.
decode_script_single_quoted_text_to_vec;
/// Decode content of a single-quoted JavaScript string to a writer.
decode_script_single_quoted_text_to_writer;
}
decode_impl! {
quoted false, false, true;
/// Escapes emitted by the matching encoder are decoded.
/// Hex escapes use `\xHH` with uppercase digits; only escaped C0 controls and `<` are decoded.
/// `\u2028` and `\u2029` are also decoded.
/// Backslashes and `"` escaped with a backslash are decoded.
/// Legacy `<\/script>` and `<\!--` escapes are also decoded.
/// Unknown or incomplete escapes are kept, and decoded text is not decoded again.
raw_text;
/// Decode content of a double-quoted JavaScript string from `<script>`.
decode_script_double_quoted_text;
/// Decode content of a double-quoted JavaScript string to a mutable `String` and return the new string slice.
decode_script_double_quoted_text_to_string;
/// Decode content of a double-quoted JavaScript string to a mutable `Vec<u8>` and return the new data slice.
decode_script_double_quoted_text_to_vec;
/// Decode content of a double-quoted JavaScript string to a writer.
decode_script_double_quoted_text_to_writer;
}
decode_impl! {
quoted false, true, true;
/// Escapes emitted by the matching encoder are decoded.
/// Hex escapes use `\xHH` with uppercase digits; only escaped C0 controls and `<` are decoded.
/// `\u2028` and `\u2029` are also decoded.
/// Backslashes, `'`, and `"` escaped with a backslash are decoded.
/// Legacy `<\/script>` and `<\!--` escapes are also decoded.
/// Unknown or incomplete escapes are kept, and decoded text is not decoded again.
raw_text;
/// Decode content of a single-quoted or double-quoted JavaScript string from `<script>`.
decode_script_quoted_text;
/// Decode content of a single-quoted or double-quoted JavaScript string to a mutable `String` and return the new string slice.
decode_script_quoted_text_to_string;
/// Decode content of a single-quoted or double-quoted JavaScript string to a mutable `Vec<u8>` and return the new data slice.
decode_script_quoted_text_to_vec;
/// Decode content of a single-quoted or double-quoted JavaScript string to a writer.
decode_script_quoted_text_to_writer;
}