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//! Quoted-string scanners: single-quote, double-quote, dollar-single-quote.
//!
//! Each scanner is a free function taking (ctx, env, pos, [payload]).
use super::super::command_checker::CheckerEnv;
use super::super::highlight::{ColorSpan, HighlightStyle};
use super::ctx::ScanCtx;
pub(super) fn scan_single_quote(
ctx: &mut ScanCtx<'_>,
_env: &CheckerEnv<'_>,
pos: usize,
start: usize,
) -> usize {
let mut p = pos;
while p < ctx.input.len() {
if ctx.input[p] == '\'' {
ctx.spans.push(ColorSpan {
start,
end: p + 1,
style: HighlightStyle::String,
});
ctx.state.pop_mode();
return p + 1;
}
p += 1;
}
// Unclosed — mark_unclosed_errors will handle it
p
}
pub(super) fn scan_dollar_single_quote(
ctx: &mut ScanCtx<'_>,
_env: &CheckerEnv<'_>,
pos: usize,
start: usize,
) -> usize {
let mut p = pos;
while p < ctx.input.len() {
if ctx.input[p] == '\\' {
// escape: skip next
p += 1;
if p < ctx.input.len() {
p += 1;
}
continue;
}
if ctx.input[p] == '\'' {
ctx.spans.push(ColorSpan {
start,
end: p + 1,
style: HighlightStyle::String,
});
ctx.state.pop_mode();
return p + 1;
}
p += 1;
}
// Unclosed
p
}
// -----------------------------------------------------------------------
// scan_double_quote
// -----------------------------------------------------------------------
pub(super) fn scan_double_quote(
ctx: &mut ScanCtx<'_>,
_env: &CheckerEnv<'_>,
pos: usize,
start: usize,
) -> usize {
let mut p = pos;
let mut text_start = start; // includes the opening "
while p < ctx.input.len() {
match ctx.input[p] {
'"' => {
// Closing double quote
ctx.spans.push(ColorSpan {
start: text_start,
end: p + 1,
style: HighlightStyle::DoubleString,
});
ctx.state.pop_mode();
return p + 1;
}
'\\' => {
// Escape: skip next char
p += 1;
if p < ctx.input.len() {
p += 1;
}
}
'$' => {
// Emit DoubleString for text accumulated so far
if p > text_start {
ctx.spans.push(ColorSpan {
start: text_start,
end: p,
style: HighlightStyle::DoubleString,
});
}
// Handle $ expansion inside double quotes
let next = if p + 1 < ctx.input.len() {
Some(ctx.input[p + 1])
} else {
None
};
match next {
Some(c) if c.is_ascii_alphabetic() || c == '_' => {
let var_start = p;
let mut end = p + 1;
while end < ctx.input.len()
&& (ctx.input[end].is_ascii_alphanumeric() || ctx.input[end] == '_')
{
end += 1;
}
ctx.spans.push(ColorSpan {
start: var_start,
end,
style: HighlightStyle::Variable,
});
p = end;
text_start = p;
}
Some(c)
if c.is_ascii_digit()
|| matches!(c, '@' | '*' | '#' | '?' | '-' | '$' | '!') =>
{
ctx.spans.push(ColorSpan {
start: p,
end: p + 2,
style: HighlightStyle::Variable,
});
p += 2;
text_start = p;
}
Some('{') => {
// ${...} inside double quote — scan to closing }
let brace_start = p;
p += 2; // skip ${
while p < ctx.input.len() && ctx.input[p] != '}' {
p += 1;
}
if p < ctx.input.len() {
p += 1; // skip }
}
ctx.spans.push(ColorSpan {
start: brace_start,
end: p,
style: HighlightStyle::Variable,
});
text_start = p;
}
Some('(') => {
// $( or $(( inside double quotes
if p + 2 < ctx.input.len() && ctx.input[p + 2] == '(' {
// $(( — arithmetic
let arith_start = p;
p += 3;
while p + 1 < ctx.input.len()
&& !(ctx.input[p] == ')' && ctx.input[p + 1] == ')')
{
p += 1;
}
if p + 1 < ctx.input.len() {
p += 2;
}
ctx.spans.push(ColorSpan {
start: arith_start,
end: p,
style: HighlightStyle::ArithSub,
});
text_start = p;
} else {
// $( — command sub inside double quotes
let cmd_start = p;
p += 2;
let mut depth = 1;
while p < ctx.input.len() && depth > 0 {
if ctx.input[p] == '(' {
depth += 1;
} else if ctx.input[p] == ')' {
depth -= 1;
}
if depth > 0 {
p += 1;
}
}
if p < ctx.input.len() {
p += 1;
}
ctx.spans.push(ColorSpan {
start: cmd_start,
end: p,
style: HighlightStyle::CommandSub,
});
text_start = p;
}
}
_ => {
// Bare $
p += 1;
text_start = p - 1; // include $ in next string span
}
}
}
'`' => {
// Backtick inside double quotes
if p > text_start {
ctx.spans.push(ColorSpan {
start: text_start,
end: p,
style: HighlightStyle::DoubleString,
});
}
let bt_start = p;
p += 1;
while p < ctx.input.len() && ctx.input[p] != '`' {
if ctx.input[p] == '\\' {
p += 1;
}
p += 1;
}
if p < ctx.input.len() {
p += 1; // skip closing `
}
ctx.spans.push(ColorSpan {
start: bt_start,
end: p,
style: HighlightStyle::CommandSub,
});
text_start = p;
}
_ => {
p += 1;
}
}
}
// Unclosed — mark_unclosed_errors will handle it
p
}