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use std::{char, str}; use std::num::ParseIntError; use synom::IResult; pub fn cooked_string(input: &str) -> IResult<&str, String> { let mut s = String::new(); let mut chars = input.char_indices().peekable(); while let Some((byte_offset, ch)) = chars.next() { match ch { '"' => { return IResult::Done(&input[byte_offset..], s); } '\r' => { if let Some((_, '\n')) = chars.next() { s.push('\n'); } else { break; } } '\\' => { match chars.next() { Some((_, 'x')) => { match backslash_x_char(&mut chars) { Some(ch) => s.push(ch), None => break, } } Some((_, 'n')) => s.push('\n'), Some((_, 'r')) => s.push('\r'), Some((_, 't')) => s.push('\t'), Some((_, '\\')) => s.push('\\'), Some((_, '0')) => s.push('\0'), Some((_, 'u')) => { match backslash_u(&mut chars) { Some(ch) => s.push(ch), None => break, } } Some((_, '\'')) => s.push('\''), Some((_, '"')) => s.push('"'), Some((_, '\n')) | Some((_, '\r')) => { while let Some(&(_, ch)) = chars.peek() { if ch.is_whitespace() { chars.next(); } else { break; } } } _ => break, } } ch => { s.push(ch); } } } IResult::Error } pub fn cooked_byte_string(mut input: &str) -> IResult<&str, Vec<u8>> { let mut vec = Vec::new(); let mut bytes = input.bytes().enumerate(); 'outer: while let Some((offset, b)) = bytes.next() { match b { b'"' => { return IResult::Done(&input[offset..], vec); } b'\r' => { if let Some((_, b'\n')) = bytes.next() { vec.push(b'\n'); } else { break; } } b'\\' => { match bytes.next() { Some((_, b'x')) => { match backslash_x_byte(&mut bytes) { Some(b) => vec.push(b), None => break, } } Some((_, b'n')) => vec.push(b'\n'), Some((_, b'r')) => vec.push(b'\r'), Some((_, b't')) => vec.push(b'\t'), Some((_, b'\\')) => vec.push(b'\\'), Some((_, b'0')) => vec.push(b'\0'), Some((_, b'\'')) => vec.push(b'\''), Some((_, b'"')) => vec.push(b'"'), Some((newline, b'\n')) | Some((newline, b'\r')) => { let rest = &input[newline + 1..]; for (offset, ch) in rest.char_indices() { if !ch.is_whitespace() { input = &rest[offset..]; bytes = input.bytes().enumerate(); continue 'outer; } } break; } _ => break, } } b if b < 0x80 => { vec.push(b); } _ => break, } } IResult::Error } pub fn cooked_char(input: &str) -> IResult<&str, char> { let mut chars = input.char_indices(); let ch = match chars.next().map(|(_, ch)| ch) { Some('\\') => { match chars.next().map(|(_, ch)| ch) { Some('x') => backslash_x_char(&mut chars), Some('n') => Some('\n'), Some('r') => Some('\r'), Some('t') => Some('\t'), Some('\\') => Some('\\'), Some('0') => Some('\0'), Some('u') => backslash_u(&mut chars), Some('\'') => Some('\''), Some('"') => Some('"'), _ => None, } } ch => ch, }; match ch { Some(ch) => IResult::Done(chars.as_str(), ch), None => IResult::Error, } } pub fn cooked_byte(input: &str) -> IResult<&str, u8> { let mut bytes = input.bytes().enumerate(); let b = match bytes.next().map(|(_, b)| b) { Some(b'\\') => { match bytes.next().map(|(_, b)| b) { Some(b'x') => backslash_x_byte(&mut bytes), Some(b'n') => Some(b'\n'), Some(b'r') => Some(b'\r'), Some(b't') => Some(b'\t'), Some(b'\\') => Some(b'\\'), Some(b'0') => Some(b'\0'), Some(b'\'') => Some(b'\''), Some(b'"') => Some(b'"'), _ => None, } } b => b, }; match b { Some(b) => { match bytes.next() { Some((offset, _)) => IResult::Done(&input[offset..], b), None => IResult::Done("", b), } } None => IResult::Error, } } pub fn raw_string(input: &str) -> IResult<&str, (String, usize)> { let mut chars = input.char_indices(); let mut n = 0; while let Some((byte_offset, ch)) = chars.next() { match ch { '"' => { n = byte_offset; break; } '#' => {} _ => return IResult::Error, } } let mut s = String::new(); for (byte_offset, ch) in chars { match ch { '"' if input[byte_offset + 1..].starts_with(&input[..n]) => { let rest = &input[byte_offset + 1 + n..]; return IResult::Done(rest, (s, n)); } '\r' => {} _ => s.push(ch), } } IResult::Error } macro_rules! next_ch { ($chars:ident @ $pat:pat $(| $rest:pat)*) => { match $chars.next() { Some((_, ch)) => match ch { $pat $(| $rest)* => ch, _ => return None, }, None => return None, } }; } trait FromStrRadix: Sized { fn from_str_radix(src: &str, radix: u32) -> Result<Self, ParseIntError>; } impl FromStrRadix for u8 { fn from_str_radix(src: &str, radix: u32) -> Result<Self, ParseIntError> { u8::from_str_radix(src, radix) } } impl FromStrRadix for u32 { fn from_str_radix(src: &str, radix: u32) -> Result<Self, ParseIntError> { u32::from_str_radix(src, radix) } } macro_rules! from_hex { ($($ch:ident)+) => {{ let hex_bytes = &[$($ch as u8),*]; let hex_str = str::from_utf8(hex_bytes).unwrap(); FromStrRadix::from_str_radix(hex_str, 16).unwrap() }}; } #[cfg_attr(feature = "cargo-clippy", allow(diverging_sub_expression))] fn backslash_x_char<I>(chars: &mut I) -> Option<char> where I: Iterator<Item = (usize, char)> { let a = next_ch!(chars @ '0'...'7'); let b = next_ch!(chars @ '0'...'9' | 'a'...'f' | 'A'...'F'); char::from_u32(from_hex!(a b)) } #[cfg_attr(feature = "cargo-clippy", allow(diverging_sub_expression))] fn backslash_x_byte<I>(chars: &mut I) -> Option<u8> where I: Iterator<Item = (usize, u8)> { let a = next_ch!(chars @ b'0'...b'9' | b'a'...b'f' | b'A'...b'F'); let b = next_ch!(chars @ b'0'...b'9' | b'a'...b'f' | b'A'...b'F'); Some(from_hex!(a b)) } #[cfg_attr(feature = "cargo-clippy", allow(diverging_sub_expression, many_single_char_names))] fn backslash_u<I>(chars: &mut I) -> Option<char> where I: Iterator<Item = (usize, char)> { next_ch!(chars @ '{'); let a = next_ch!(chars @ '0'...'9' | 'a'...'f' | 'A'...'F'); let b = next_ch!(chars @ '0'...'9' | 'a'...'f' | 'A'...'F' | '}'); if b == '}' { return char::from_u32(from_hex!(a)); } let c = next_ch!(chars @ '0'...'9' | 'a'...'f' | 'A'...'F' | '}'); if c == '}' { return char::from_u32(from_hex!(a b)); } let d = next_ch!(chars @ '0'...'9' | 'a'...'f' | 'A'...'F' | '}'); if d == '}' { return char::from_u32(from_hex!(a b c)); } let e = next_ch!(chars @ '0'...'9' | 'a'...'f' | 'A'...'F' | '}'); if e == '}' { return char::from_u32(from_hex!(a b c d)); } let f = next_ch!(chars @ '0'...'9' | 'a'...'f' | 'A'...'F' | '}'); if f == '}' { return char::from_u32(from_hex!(a b c d e)); } next_ch!(chars @ '}'); char::from_u32(from_hex!(a b c d e f)) } #[test] fn test_cooked_string() { let input = "\\x62 \\\n \\u{7} \\u{64} \\u{bf5} \\u{12ba} \\u{1F395} \\u{102345}\""; let expected = "\x62 \u{7} \u{64} \u{bf5} \u{12ba} \u{1F395} \u{102345}"; assert_eq!(cooked_string(input), IResult::Done("\"", expected.to_string())); } #[test] fn test_cooked_byte_string() { let input = "\\x62 \\\n \\xEF\""; let expected = b"\x62 \xEF"; assert_eq!(cooked_byte_string(input), IResult::Done("\"", expected.to_vec())); }