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use super::super::scanner::Scanner;
use crate::haystack::val::Str;
use std::io::{Error, Read};
pub(crate) fn parse_str<R: Read>(scanner: &mut Scanner<R>) -> Result<Str, Error> {
let start = scanner.pos;
scanner.expect_and_consume(b'"')?;
let mut str = Vec::new();
while scanner.cur != b'"' {
if scanner.is_eof {
return scanner.make_generic_err("Expected '\"'");
}
if scanner.cur == b'\\' {
let unicode = parse_str_escape(scanner)?;
str.extend_from_slice(unicode.as_bytes());
} else {
str.push(scanner.cur);
}
if let Err(err) = scanner.read() {
if !scanner.is_eof {
return Err(err);
}
}
}
if start == scanner.pos {
return scanner.make_generic_err("Unterminated Str");
}
if let Err(err) = scanner.read() {
if !scanner.is_eof {
return Err(err);
}
}
Ok(Str {
value: String::from_utf8_lossy(&str).to_string(),
})
}
pub(super) fn parse_str_escape<R: Read>(scanner: &mut Scanner<R>) -> Result<String, Error> {
scanner.read()?;
match scanner.cur {
b'b' => Ok("\x0b".into()),
b'f' => Ok("\x0f".into()),
b'n' => Ok("\n".into()),
b'r' => Ok("\r".into()),
b't' => Ok("\t".into()),
b'"' => Ok("\"".into()),
b'$' => Ok("$".into()),
b'\'' => Ok("'".into()),
b'`' => Ok("`".into()),
b'\\' => Ok("\\".into()),
b'u' => Ok(parse_str_unicode_escape(scanner)?),
_ => scanner.make_generic_err(&format!("Invalid escape sequence '{}'", scanner.cur)),
}
}
pub(super) fn parse_str_unicode_escape<R: Read>(scanner: &mut Scanner<R>) -> Result<String, Error> {
if scanner.cur == b'u' {
let mut esc = Vec::new();
for _ in 0..4 {
scanner.read()?;
if !scanner.is_hex_digit() {
return scanner
.make_generic_err(&format!("Invalid unicode escape '{}'", scanner.cur));
}
esc.push(scanner.cur)
}
let str = String::from_utf8_lossy(&esc).to_string();
match u16::from_str_radix(&str, 16) {
Ok(char) => Ok(String::from_utf16_lossy(&[char])),
Err(err) => scanner
.make_generic_err(&format!("Invalid unicode escape char '{str}', err: {err}")),
}
} else {
scanner.make_generic_err(&format!("Invalid escape sequence '{}'", scanner.cur))
}
}
#[cfg(test)]
mod test {
use super::parse_str;
use crate::haystack::val::Str;
use std::io::Cursor;
#[test]
fn test_zinc_parse_str() {
let mut input = Cursor::new(r#""A String" "#.as_bytes());
let mut scanner = super::Scanner::make(&mut input).expect("Scanner");
let str = parse_str(&mut scanner);
assert_eq!(str.ok(), Some(Str::make("A String")));
{
let mut input = Cursor::new("\"\n\t\"".as_bytes());
let mut scanner = super::Scanner::make(&mut input).expect("Scanner");
let str = parse_str(&mut scanner);
assert_eq!(str.ok(), Some(Str::make("\n\t")))
}
}
#[test]
fn test_zinc_parse_utf8_str() {
let mut input = Cursor::new("\"m³_gas\"".as_bytes());
let mut scanner = super::Scanner::make(&mut input).expect("Scanner");
let str = parse_str(&mut scanner);
assert_eq!(str.ok(), Some(Str::make("m³_gas")));
}
#[test]
fn test_zinc_parse_str_bad() {
let mut input = Cursor::new(r#"""#.as_bytes());
let mut scanner = super::Scanner::make(&mut input).expect("Scanner");
assert!(parse_str(&mut scanner).is_err());
let mut input = Cursor::new(r#""ala bala"#.as_bytes());
let mut scanner = super::Scanner::make(&mut input).expect("Scanner");
let str = parse_str(&mut scanner);
assert!(str.is_err());
{
let mut input = Cursor::new("\"x".as_bytes());
let mut scanner = super::Scanner::make(&mut input).expect("Scanner");
let str = parse_str(&mut scanner);
assert!(str.is_err())
}
}
}
