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use crate::css::CssString;
use crate::error::{Error, ResultPos};
use crate::sass::Value;
use crate::value::Quotes;
use crate::ScopeRef;
use std::fmt::{self, Write};
/// A string that may contain interpolations.
///
/// Used in all places in sass items and values where interpolations
/// may occur.
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd)]
pub struct SassString {
parts: Vec<StringPart>,
quotes: Quotes,
}
/// A part of a string value, either a string or a value to interpolate from.
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd)]
pub enum StringPart {
/// A raw (literal) string.
Raw(String),
/// A value to be evaluated.
Interpolation(Value),
}
impl SassString {
/// Create a new sassstring from parts.
pub fn new(parts: Vec<StringPart>, quotes: Quotes) -> Self {
// Any sequence of Raw parts in `parts` shall be merged to a
// single Raw part. Interpolation parts are left as is.
let mut p2 = vec![];
let mut buf = String::new();
for part in parts {
match part {
StringPart::Raw(s) => buf.push_str(&s),
interpolation => {
if !buf.is_empty() {
p2.push(StringPart::Raw(std::mem::take(&mut buf)));
}
p2.push(interpolation);
}
}
}
if !buf.is_empty() {
p2.push(StringPart::Raw(buf));
}
Self { parts: p2, quotes }
}
/// Evaluate this `SassString` to a `CssString`.
///
/// All interpolated values are interpolated in the given `scope`.
pub fn evaluate(&self, scope: ScopeRef) -> Result<CssString, Error> {
let mut result = String::new();
for part in &self.parts {
match *part {
StringPart::Interpolation(ref v) => {
let v = v.evaluate(scope.clone())?.unquote();
if self.quotes == Quotes::None {
let v = v
.valid_css()
.no_pos()? // TODO: Get the position.
.format(scope.get_format())
.to_string();
result.push_str(&v);
} else {
let v = v.format(scope.get_format()).to_string();
let mut carry_space = false;
for c in v.chars() {
if carry_space {
if c.is_ascii_hexdigit() || c == '\t' {
result.push(' ');
}
carry_space = false;
}
if c == '\\' {
write!(&mut result, "\\{c}")?;
} else if c.is_alphanumeric()
|| c.is_ascii_graphic()
|| c == ' '
|| c == '\t'
|| c == char::REPLACEMENT_CHARACTER
{
result.push(c);
} else if !c.is_control()
&& c != '\n'
&& c != '\t'
{
result.push('\\');
result.push(c);
} else {
write!(&mut result, "\\{:x}", u32::from(c))?;
carry_space = true;
}
}
}
}
StringPart::Raw(ref s) => {
result.push_str(s);
}
}
}
Ok(CssString::new(result, self.quotes))
}
/// Return true if self represents an unquoted string.
pub fn is_unquoted(&self) -> bool {
self.quotes == Quotes::None
}
/// Return true if self contains any string interpolation(s).
pub fn is_interpolated(&self) -> bool {
self.parts
.iter()
.any(|p| matches!(p, StringPart::Interpolation(_)))
}
/// Check if this `SassString` is a single raw value.
///
/// If so, return a reference to it.
pub fn single_raw(&self) -> Option<&str> {
if self.parts.len() == 1 {
if let StringPart::Raw(ref s) = self.parts[0] {
return Some(s);
}
}
None
}
pub(crate) fn prepend(&mut self, data: &str) {
if let Some(StringPart::Raw(ref mut first)) = self.parts.get_mut(0) {
first.insert_str(0, data);
} else {
self.parts.insert(0, data.into());
}
}
pub(crate) fn append_str(&mut self, data: &str) {
if let Some(StringPart::Raw(ref mut last)) = self.parts.last_mut() {
last.push_str(data);
} else {
self.parts.push(data.into());
}
}
pub(crate) fn append(&mut self, other: &Self) {
self.parts.extend_from_slice(&other.parts);
}
pub(crate) fn parts(self) -> Vec<StringPart> {
self.parts
}
}
impl fmt::Display for SassString {
fn fmt(&self, out: &mut fmt::Formatter) -> fmt::Result {
self.quotes.fmt(out)?;
for part in &self.parts {
match *part {
StringPart::Raw(ref s) => s.fmt(out)?,
StringPart::Interpolation(ref v) => {
panic!("Interpolation should be evaluated: {v:?}")
}
}
}
self.quotes.fmt(out)
}
}
impl From<CssString> for SassString {
fn from(s: CssString) -> Self {
Self {
parts: vec![StringPart::Raw(s.value().into())],
quotes: s.quotes(),
}
}
}
impl From<&str> for StringPart {
fn from(s: &str) -> Self {
Self::Raw(s.to_string())
}
}
impl From<&str> for SassString {
fn from(s: &str) -> Self {
Self {
parts: vec![StringPart::from(s)],
quotes: Quotes::None,
}
}
}
impl From<String> for SassString {
fn from(value: String) -> Self {
Self {
parts: vec![StringPart::Raw(value)],
quotes: Quotes::None,
}
}
}