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//! Code for applying replacement templates for matches that have previously been found.
use crate::matching::Var;
use crate::parsing::PatternElement;
use crate::{Match, SsrMatches};
use ra_syntax::ast::AstToken;
use ra_syntax::TextSize;
use ra_text_edit::TextEdit;
/// Returns a text edit that will replace each match in `matches` with its corresponding replacement
/// template. Placeholders in the template will have been substituted with whatever they matched to
/// in the original code.
pub(crate) fn matches_to_edit(matches: &SsrMatches, file_src: &str) -> TextEdit {
matches_to_edit_at_offset(matches, file_src, 0.into())
}
fn matches_to_edit_at_offset(
matches: &SsrMatches,
file_src: &str,
relative_start: TextSize,
) -> TextEdit {
let mut edit_builder = ra_text_edit::TextEditBuilder::default();
for m in &matches.matches {
edit_builder
.replace(m.range.checked_sub(relative_start).unwrap(), render_replace(m, file_src));
}
edit_builder.finish()
}
fn render_replace(match_info: &Match, file_src: &str) -> String {
let mut out = String::new();
for r in &match_info.template.tokens {
match r {
PatternElement::Token(t) => out.push_str(t.text.as_str()),
PatternElement::Placeholder(p) => {
if let Some(placeholder_value) =
match_info.placeholder_values.get(&Var(p.ident.to_string()))
{
let range = &placeholder_value.range.range;
let mut matched_text =
file_src[usize::from(range.start())..usize::from(range.end())].to_owned();
let edit = matches_to_edit_at_offset(
&placeholder_value.inner_matches,
file_src,
range.start(),
);
edit.apply(&mut matched_text);
out.push_str(&matched_text);
} else {
// We validated that all placeholder references were valid before we
// started, so this shouldn't happen.
panic!(
"Internal error: replacement referenced unknown placeholder {}",
p.ident
);
}
}
}
}
for comment in &match_info.ignored_comments {
out.push_str(&comment.syntax().to_string());
}
out
}
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