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use crate::value::Quotes;
use std::fmt::{self, Write};
/// A string in css. May be quoted.
#[derive(Clone, Debug, Eq, PartialOrd)]
pub struct CssString {
value: String,
quotes: Quotes,
}
impl CssString {
/// Create a new `CssString`.
pub fn new(value: String, quotes: Quotes) -> Self {
Self { value, quotes }
}
/// Unquote this string.
pub fn unquote(self) -> String {
if self.quotes.is_none() {
self.value
} else {
let mut result = String::new();
let mut iter = self.value.chars().peekable();
while let Some(c) = iter.next() {
if c == '\\' {
let mut val: u32 = 0;
let mut got_num = false;
let nextchar = loop {
match iter.peek() {
Some(' ') if got_num => {
iter.next();
break None;
}
Some(&c) => {
if let Some(digit) = c.to_digit(16) {
val = val * 10 + digit;
got_num = true;
iter.next();
} else if !got_num {
break iter.next();
} else {
break None;
}
}
_ => break None,
}
};
if got_num {
result.push(
char::try_from(val)
.unwrap_or(char::REPLACEMENT_CHARACTER),
);
}
match nextchar {
Some('\n') => {
result.push('\\');
result.push('a');
}
Some(c) => {
result.push(c);
}
None => (),
}
} else {
result.push(c);
}
}
result
}
}
/// If the value is name-like, make it unquoted.
pub fn opt_unquote(self) -> Self {
let t = is_namelike(&self.value);
Self {
value: self.value,
quotes: if t { Quotes::None } else { self.quotes },
}
}
/// Quote this string
pub fn quote(self) -> Self {
let value = if self.quotes.is_none() {
self.value.replace('\\', "\\\\")
} else {
self.value
};
if value.contains('"') && !value.contains('\'') {
Self {
value,
quotes: Quotes::Single,
}
} else {
Self {
value,
quotes: Quotes::Double,
}
}
}
/// Adapt the kind of quotes as prefered for a css value.
pub fn pref_dquotes(self) -> Self {
let value = self.value;
let quotes = match self.quotes {
Quotes::Double
if value.contains('"') && !value.contains('\'') =>
{
Quotes::Single
}
Quotes::Single
if !value.contains('"') || value.contains('\'') =>
{
Quotes::Double
}
q => q,
};
Self { value, quotes }
}
/// Return true if this is an empty unquoted string.
pub fn is_null(&self) -> bool {
self.value.is_empty() && self.quotes.is_none()
}
pub(crate) fn is_name(&self) -> bool {
self.quotes == Quotes::None && is_namelike(&self.value)
}
/// Return true if this is a css special function call.
pub(crate) fn is_css_fn(&self) -> bool {
let value = self.value();
self.quotes() == Quotes::None
&& (value.ends_with(')')
&& (value.starts_with("calc(") || value.starts_with("var(")))
// The following is only relevant in relative colors
// but I don't see how to get that context to where its needed,
// and I don't see any real harm in puttin them like this.
|| ["h", "s", "l", "r", "g", "b"].iter().any(|s| value == *s)
}
/// Return true if this is a css special function call.
pub(crate) fn is_css_calc(&self) -> bool {
let value = self.value();
self.quotes() == Quotes::None
&& value.ends_with(')')
&& (value.starts_with("calc(") || value.starts_with("clamp("))
}
/// Return true if this is a css url function call.
pub(crate) fn is_css_url(&self) -> bool {
let value = self.value();
self.quotes() == Quotes::None
&& value.ends_with(')')
&& value.starts_with("url(")
}
/// Access the string value
pub fn value(&self) -> &str {
&self.value
}
/// Take the string value, discarding quote information.
pub fn take_value(self) -> String {
self.value
}
/// Access the quotes
pub fn quotes(&self) -> Quotes {
self.quotes
}
}
impl<S: Into<String>> From<S> for CssString {
fn from(value: S) -> Self {
Self {
value: value.into(),
quotes: Quotes::None,
}
}
}
impl fmt::Display for CssString {
fn fmt(&self, out: &mut fmt::Formatter) -> fmt::Result {
let q = match self.quotes {
Quotes::None => None,
Quotes::Double => Some('"'),
Quotes::Single => Some('\''),
};
if let Some(q) = q {
out.write_char(q)?;
}
for c in self.value.chars() {
if Some(c) == q {
out.write_char('\\')?;
out.write_char(c)?;
} else if is_private_use(c) {
write!(out, "\\{:x}", c as u32)?;
} else {
out.write_char(c)?;
}
}
if let Some(q) = q {
out.write_char(q)?;
};
Ok(())
}
}
impl PartialEq for CssString {
fn eq(&self, other: &Self) -> bool {
if self.quotes == other.quotes {
self.value == other.value
} else {
self.clone().unquote() == other.clone().unquote()
}
}
}
impl From<CssString> for crate::sass::Name {
fn from(s: CssString) -> Self {
s.value.into()
}
}
fn is_namelike(s: &str) -> bool {
let mut chars = s.chars();
chars
.next()
.map_or(false, |c| c.is_alphabetic() || c == '_')
&& chars.all(|c| c.is_alphanumeric() || c == '-' || c == '_')
}
fn is_private_use(c: char) -> bool {
// https://en.wikipedia.org/wiki/Private_Use_Areas
('\u{E000}'..='\u{F8FF}').contains(&c)
|| ('\u{F0000}'..='\u{FFFFD}').contains(&c)
|| ('\u{100000}'..='\u{10FFFD}').contains(&c)
}