Add few smoke tests for patterns and refactoring

crates/ra_ide/src/completion/complete_keyword.rs

@@ -65,13 +65,13 @@ pub(super) fn complete_expr_keyword(acc: &mut Completions, ctx: &CompletionConte
     add_keyword(ctx, acc, "use", "fn $0() {}", ctx.is_new_item || ctx.block_expr_parent);
     add_keyword(ctx, acc, "impl", "impl $0 {}", ctx.is_new_item);
     add_keyword(ctx, acc, "trait", "impl $0 {}", ctx.is_new_item);
-    add_keyword(ctx, acc, "enum", "enum $0 {}", ctx.is_new_item && !ctx.after_unsafe);
+    add_keyword(ctx, acc, "enum", "enum $0 {}", ctx.is_new_item && !ctx.unsafe_is_prev);
-    add_keyword(ctx, acc, "struct", "struct $0 {}", ctx.is_new_item && !ctx.after_unsafe);
+    add_keyword(ctx, acc, "struct", "struct $0 {}", ctx.is_new_item && !ctx.unsafe_is_prev);
-    add_keyword(ctx, acc, "union", "union $0 {}", ctx.is_new_item && !ctx.after_unsafe);
+    add_keyword(ctx, acc, "union", "union $0 {}", ctx.is_new_item && !ctx.unsafe_is_prev);
     add_keyword(ctx, acc, "match", "match $0 {}", ctx.block_expr_parent);
     add_keyword(ctx, acc, "loop", "loop {$0}", ctx.block_expr_parent);
     add_keyword(ctx, acc, "while", "while $0 {}", ctx.block_expr_parent);
-    add_keyword(ctx, acc, "let", "let ", ctx.after_if || ctx.block_expr_parent);
+    add_keyword(ctx, acc, "let", "let ", ctx.if_is_prev || ctx.block_expr_parent);
     add_keyword(ctx, acc, "else", "else {$0}", ctx.after_if);
     add_keyword(ctx, acc, "else if", "else if $0 {}", ctx.after_if);
     add_keyword(ctx, acc, "mod", "mod $0 {}", ctx.is_new_item || ctx.block_expr_parent);

crates/ra_ide/src/completion/completion_context.rs

@@ -12,8 +12,8 @@ use ra_syntax::{
 use ra_text_edit::Indel;
 
 use super::patterns::{
-    goes_after_unsafe, has_bind_pat_parent, has_block_expr_parent, has_impl_as_prev_sibling,
+    has_bind_pat_parent, has_block_expr_parent, has_impl_as_prev_sibling, has_ref_pat_parent,
-    has_ref_pat_parent, has_trait_as_prev_sibling, inside_trait, is_in_loop_body,
+    has_trait_as_prev_sibling, if_is_prev, inside_trait, is_in_loop_body, unsafe_is_prev,
 };
 use crate::{call_info::ActiveParameter, completion::CompletionConfig, FilePosition};
 use test_utils::mark;
@@ -64,7 +64,8 @@ pub(crate) struct CompletionContext<'a> {
     pub(super) is_path_type: bool,
     pub(super) has_type_args: bool,
     pub(super) attribute_under_caret: Option<ast::Attr>,
-    pub(super) after_unsafe: bool,
+    pub(super) unsafe_is_prev: bool,
+    pub(super) if_is_prev: bool,
     pub(super) block_expr_parent: bool,
     pub(super) bind_pat_parent: bool,
     pub(super) ref_pat_parent: bool,
@@ -130,7 +131,7 @@ impl<'a> CompletionContext<'a> {
             has_type_args: false,
             dot_receiver_is_ambiguous_float_literal: false,
             attribute_under_caret: None,
-            after_unsafe: false,
+            unsafe_is_prev: false,
             in_loop_body: false,
             ref_pat_parent: false,
             bind_pat_parent: false,
@@ -138,6 +139,7 @@ impl<'a> CompletionContext<'a> {
             inside_trait: false,
             trait_as_prev_sibling: false,
             impl_as_prev_sibling: false,
+            if_is_prev: false,
         };
 
         let mut original_file = original_file.syntax().clone();
@@ -212,7 +214,8 @@ impl<'a> CompletionContext<'a> {
         let fake_ident_token = file_with_fake_ident.token_at_offset(offset).right_biased().unwrap();
         let syntax_element = NodeOrToken::Token(fake_ident_token.clone());
         self.block_expr_parent = has_block_expr_parent(syntax_element.clone());
-        self.after_unsafe = goes_after_unsafe(syntax_element.clone());
+        self.unsafe_is_prev = unsafe_is_prev(syntax_element.clone());
+        self.if_is_prev = if_is_prev(syntax_element.clone());
         self.bind_pat_parent = has_bind_pat_parent(syntax_element.clone());
         self.ref_pat_parent = has_ref_pat_parent(syntax_element.clone());
         self.in_loop_body = is_in_loop_body(syntax_element.clone());

crates/ra_ide/src/completion/patterns.rs

@@ -22,7 +22,7 @@ pub(crate) fn has_ref_pat_parent(element: SyntaxElement) -> bool {
     element.ancestors().find(|it| it.kind() == REF_PAT).is_some()
 }
 
-pub(crate) fn goes_after_unsafe(element: SyntaxElement) -> bool {
+pub(crate) fn unsafe_is_prev(element: SyntaxElement) -> bool {
     element
         .into_token()
         .and_then(|it| previous_non_trivia_token(it))
@@ -30,6 +30,14 @@ pub(crate) fn goes_after_unsafe(element: SyntaxElement) -> bool {
         .is_some()
 }
 
+pub(crate) fn if_is_prev(element: SyntaxElement) -> bool {
+    element
+        .into_token()
+        .and_then(|it| previous_non_trivia_token(it))
+        .filter(|it| it.kind() == IF_KW)
+        .is_some()
+}
+
 pub(crate) fn has_block_expr_parent(element: SyntaxElement) -> bool {
     not_same_range_ancestor(element).filter(|it| it.kind() == BLOCK_EXPR).is_some()
 }
@@ -110,3 +118,79 @@ fn previous_sibling_or_ancestor_sibling(element: SyntaxElement) -> Option<Syntax
         non_trivia_sibling(NodeOrToken::Node(prev_sibling_node), Direction::Prev)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{
+        has_block_expr_parent, has_impl_as_prev_sibling, has_trait_as_prev_sibling, if_is_prev,
+        inside_trait, unsafe_is_prev,
+    };
+    use crate::completion::test_utils::check_pattern_is_applicable;
+
+    #[test]
+    fn test_unsafe_is_prev() {
+        check_pattern_is_applicable(
+            r"
+        unsafe i<|>
+        ",
+            unsafe_is_prev,
+        );
+    }
+
+    #[test]
+    fn test_if_is_prev() {
+        check_pattern_is_applicable(
+            r"
+        if l<|>
+        ",
+            if_is_prev,
+        );
+    }
+
+    #[test]
+    fn test_inside_trait() {
+        check_pattern_is_applicable(
+            r"
+        trait A {
+            fn<|>
+        }
+        ",
+            inside_trait,
+        );
+    }
+
+    #[test]
+    fn test_has_trait_as_prev_sibling() {
+        check_pattern_is_applicable(
+            r"
+        trait A w<|> {
+        }
+        ",
+            has_trait_as_prev_sibling,
+        );
+    }
+
+    #[test]
+    fn test_has_impl_as_prev_sibling() {
+        check_pattern_is_applicable(
+            r"
+        impl A w<|> {
+        }
+        ",
+            has_impl_as_prev_sibling,
+        );
+    }
+
+    #[test]
+    fn test_parent_block_expr() {
+        check_pattern_is_applicable(
+            r"
+        fn my_fn() {
+            let a = 2;
+            f<|>
+        }
+        ",
+            has_block_expr_parent,
+        );
+    }
+}

crates/ra_ide/src/completion/test_utils.rs

@@ -5,6 +5,8 @@ use crate::{
     mock_analysis::{analysis_and_position, single_file_with_position},
     CompletionItem,
 };
+use hir::Semantics;
+use ra_syntax::{AstNode, NodeOrToken, SyntaxElement, SyntaxToken};
 
 pub(crate) fn do_completion(code: &str, kind: CompletionKind) -> Vec<CompletionItem> {
     do_completion_with_options(code, kind, &CompletionConfig::default())
@@ -27,3 +29,15 @@ pub(crate) fn do_completion_with_options(
     kind_completions.sort_by_key(|c| c.label().to_owned());
     kind_completions
 }
+
+pub(crate) fn check_pattern_is_applicable(code: &str, check: fn(SyntaxElement) -> bool) {
+    let (analysis, pos) = single_file_with_position(code);
+    analysis
+        .with_db(|db| {
+            let sema = Semantics::new(db);
+            let original_file = sema.parse(pos.file_id);
+            let token = original_file.syntax().token_at_offset(pos.offset).left_biased().unwrap();
+            assert!(check(NodeOrToken::Token(token)));
+        })
+        .unwrap();
+}