Bring the implementation closer to VSCode snippet definitions

crates/ide_completion/src/config.rs

@@ -6,7 +6,7 @@
 
 use ide_db::helpers::{insert_use::InsertUseConfig, SnippetCap};
 
-use crate::snippet::{PostfixSnippet, Snippet};
+use crate::snippet::Snippet;
 
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct CompletionConfig {
@@ -17,6 +17,18 @@ pub struct CompletionConfig {
     pub add_call_argument_snippets: bool,
     pub snippet_cap: Option<SnippetCap>,
     pub insert_use: InsertUseConfig,
-    pub postfix_snippets: Vec<PostfixSnippet>,
     pub snippets: Vec<Snippet>,
 }
+
+impl CompletionConfig {
+    pub fn postfix_snippets(&self) -> impl Iterator<Item = (&str, &Snippet)> {
+        self.snippets.iter().flat_map(|snip| {
+            snip.postfix_triggers.iter().map(move |trigger| (trigger.as_str(), snip))
+        })
+    }
+    pub fn prefix_snippets(&self) -> impl Iterator<Item = (&str, &Snippet)> {
+        self.snippets.iter().flat_map(|snip| {
+            snip.prefix_triggers.iter().map(move |trigger| (trigger.as_str(), snip))
+        })
+    }
+}