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