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|
//! Code for applying replacement templates for matches that have previously been found.
use crate::matching::Var;
use crate::{parsing::ParsedRule, Match, SsrMatches};
use ra_syntax::ast::AstToken;
use ra_syntax::{SyntaxElement, SyntaxNode, SyntaxToken, 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,
rules: &[ParsedRule],
) -> TextEdit {
matches_to_edit_at_offset(matches, file_src, 0.into(), rules)
}
fn matches_to_edit_at_offset(
matches: &SsrMatches,
file_src: &str,
relative_start: TextSize,
rules: &[ParsedRule],
) -> TextEdit {
let mut edit_builder = ra_text_edit::TextEditBuilder::default();
for m in &matches.matches {
edit_builder.replace(
m.range.range.checked_sub(relative_start).unwrap(),
render_replace(m, file_src, rules),
);
}
edit_builder.finish()
}
struct ReplacementRenderer<'a> {
match_info: &'a Match,
file_src: &'a str,
rules: &'a [ParsedRule],
rule: &'a ParsedRule,
}
fn render_replace(match_info: &Match, file_src: &str, rules: &[ParsedRule]) -> String {
let mut out = String::new();
let rule = &rules[match_info.rule_index];
let template = rule
.template
.as_ref()
.expect("You called MatchFinder::edits after calling MatchFinder::add_search_pattern");
let renderer = ReplacementRenderer { match_info, file_src, rules, rule };
renderer.render_node_children(&template, &mut out);
for comment in &match_info.ignored_comments {
out.push_str(&comment.syntax().to_string());
}
out
}
impl ReplacementRenderer<'_> {
fn render_node_children(&self, node: &SyntaxNode, out: &mut String) {
for node_or_token in node.children_with_tokens() {
self.render_node_or_token(&node_or_token, out);
}
}
fn render_node_or_token(&self, node_or_token: &SyntaxElement, out: &mut String) {
match node_or_token {
SyntaxElement::Token(token) => {
self.render_token(&token, out);
}
SyntaxElement::Node(child_node) => {
self.render_node_children(&child_node, out);
}
}
}
fn render_token(&self, token: &SyntaxToken, out: &mut String) {
if let Some(placeholder) = self.rule.get_placeholder(&token) {
if let Some(placeholder_value) =
self.match_info.placeholder_values.get(&Var(placeholder.ident.to_string()))
{
let range = &placeholder_value.range.range;
let mut matched_text =
self.file_src[usize::from(range.start())..usize::from(range.end())].to_owned();
let edit = matches_to_edit_at_offset(
&placeholder_value.inner_matches,
self.file_src,
range.start(),
self.rules,
);
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 {}",
placeholder.ident
);
}
} else {
out.push_str(token.text().as_str());
}
}
}
|
