#1435 postfix completion for integer literals

crates/ra_ide_api/src/completion/complete_postfix.rs

@@ -8,7 +8,7 @@ use crate::{
     CompletionItem,
 };
 use hir::{Ty, TypeCtor};
-use ra_syntax::{ast::AstNode, TextRange};
+use ra_syntax::{ast::AstNode, TextRange, TextUnit};
 use ra_text_edit::TextEditBuilder;
 
 fn postfix_snippet(ctx: &CompletionContext, label: &str, detail: &str, snippet: &str) -> Builder {
@@ -42,7 +42,13 @@ fn is_bool_or_unknown(ty: Option<Ty>) -> bool {
 
 pub(super) fn complete_postfix(acc: &mut Completions, ctx: &CompletionContext) {
     if let Some(dot_receiver) = &ctx.dot_receiver {
-        let receiver_text = dot_receiver.syntax().text().to_string();
+        let receiver_text = if ctx.dot_receiver_is_ambiguous_float_literal {
+            let text = dot_receiver.syntax().text();
+            let without_dot = ..text.len() - TextUnit::of_char('.');
+            text.slice(without_dot).to_string()
+        } else {
+            dot_receiver.syntax().text().to_string()
+        };
         let receiver_ty = ctx.analyzer.type_of(ctx.db, &dot_receiver);
         if is_bool_or_unknown(receiver_ty) {
             postfix_snippet(ctx, "if", "if expr {}", &format!("if {} {{$0}}", receiver_text))
@@ -206,6 +212,63 @@ mod tests {
         insert: "&mut bar",
         detail: "&mut expr",
     },
+]"###
+        );
+    }
+
+    #[test]
+    fn postfix_completion_works_for_ambiguous_float_literal() {
+        assert_debug_snapshot!(
+            do_postfix_completion(
+                r#"
+                fn main() {
+                    42.<|>
+                }
+                "#,
+            ),
+            @r###"[
+    CompletionItem {
+        label: "box",
+        source_range: [52; 52),
+        delete: [49; 52),
+        insert: "Box::new(42)",
+        detail: "Box::new(expr)",
+    },
+    CompletionItem {
+        label: "dbg",
+        source_range: [52; 52),
+        delete: [49; 52),
+        insert: "dbg!(42)",
+        detail: "dbg!(expr)",
+    },
+    CompletionItem {
+        label: "match",
+        source_range: [52; 52),
+        delete: [49; 52),
+        insert: "match 42 {\n    ${1:_} => {$0\\},\n}",
+        detail: "match expr {}",
+    },
+    CompletionItem {
+        label: "not",
+        source_range: [52; 52),
+        delete: [49; 52),
+        insert: "!42",
+        detail: "!expr",
+    },
+    CompletionItem {
+        label: "ref",
+        source_range: [52; 52),
+        delete: [49; 52),
+        insert: "&42",
+        detail: "&expr",
+    },
+    CompletionItem {
+        label: "refm",
+        source_range: [52; 52),
+        delete: [49; 52),
+        insert: "&mut 42",
+        detail: "&mut expr",
+    },
 ]"###
         );
     }