From 13f901f636846e330699a4414059591ec2e67cd1 Mon Sep 17 00:00:00 2001
From: David Lattimore <dml@google.com>
Date: Wed, 22 Jul 2020 16:31:32 +1000
Subject: SSR: Move search code into a submodule

Also renamed find_matches to slow_scan_node to reflect that it's a slow
way to do things. Actually the name came from a later commit and
probably makes more sense once there's an alternative.
---
 crates/ra_ssr/src/search.rs | 54 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 crates/ra_ssr/src/search.rs

(limited to 'crates/ra_ssr/src/search.rs')

diff --git a/crates/ra_ssr/src/search.rs b/crates/ra_ssr/src/search.rs
new file mode 100644
index 000000000..6f21452ac
--- /dev/null
+++ b/crates/ra_ssr/src/search.rs
@@ -0,0 +1,54 @@
+//! Searching for matches.
+
+use crate::{matching, Match, MatchFinder};
+use ra_db::FileRange;
+use ra_syntax::{ast, AstNode, SyntaxNode};
+
+impl<'db> MatchFinder<'db> {
+    pub(crate) fn slow_scan_node(
+        &self,
+        code: &SyntaxNode,
+        restrict_range: &Option<FileRange>,
+        matches_out: &mut Vec<Match>,
+    ) {
+        for rule in &self.rules {
+            if let Ok(mut m) = matching::get_match(false, rule, &code, restrict_range, &self.sema) {
+                // Continue searching in each of our placeholders.
+                for placeholder_value in m.placeholder_values.values_mut() {
+                    if let Some(placeholder_node) = &placeholder_value.node {
+                        // Don't search our placeholder if it's the entire matched node, otherwise we'd
+                        // find the same match over and over until we got a stack overflow.
+                        if placeholder_node != code {
+                            self.slow_scan_node(
+                                placeholder_node,
+                                restrict_range,
+                                &mut placeholder_value.inner_matches.matches,
+                            );
+                        }
+                    }
+                }
+                matches_out.push(m);
+                return;
+            }
+        }
+        // If we've got a macro call, we already tried matching it pre-expansion, which is the only
+        // way to match the whole macro, now try expanding it and matching the expansion.
+        if let Some(macro_call) = ast::MacroCall::cast(code.clone()) {
+            if let Some(expanded) = self.sema.expand(&macro_call) {
+                if let Some(tt) = macro_call.token_tree() {
+                    // When matching within a macro expansion, we only want to allow matches of
+                    // nodes that originated entirely from within the token tree of the macro call.
+                    // i.e. we don't want to match something that came from the macro itself.
+                    self.slow_scan_node(
+                        &expanded,
+                        &Some(self.sema.original_range(tt.syntax())),
+                        matches_out,
+                    );
+                }
+            }
+        }
+        for child in code.children() {
+            self.slow_scan_node(&child, restrict_range, matches_out);
+        }
+    }
+}
-- 
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