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use std::ops::Deref;
use anyhow::bail;
use super::util;
pub const MAX_LENGTH: i32 = 10_485_760;
#[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct VarChar<S: AsRef<str>>(pub S);
impl<S: AsRef<str>> Deref for VarChar<S> {
type Target = str;
fn deref(&self) -> &Self::Target {
self.0.as_ref()
}
}
pub fn extract_typ_mod(typ_mod: &[u64]) -> Result<Option<usize>, anyhow::Error> {
let typ_mod = util::extract_typ_mod::<usize>(
"character varying",
typ_mod,
&[(
"length",
1,
usize::try_from(MAX_LENGTH).expect("max length is positive"),
)],
)?;
Ok(typ_mod.get(0).cloned())
}
pub fn format_str(
s: &str,
length: Option<usize>,
fail_on_len: bool,
) -> Result<String, anyhow::Error> {
Ok(match length {
Some(l) => match s.char_indices().nth(l) {
None => s.to_string(),
Some((idx, _)) => {
if !fail_on_len || s[idx..].chars().all(|c| c.is_ascii_whitespace()) {
s[..idx].to_string()
} else {
bail!("{} exceeds maximum length of {}", s, l)
}
}
},
None => s.to_string(),
})
}