From d00add1f1fec59494c3c1a99c27937ae3891458d Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Fri, 7 Feb 2020 15:57:38 +0100
Subject: Introduce assists utils

---
 crates/ra_assists/src/handlers/apply_demorgan.rs |  3 +--
 crates/ra_assists/src/handlers/early_return.rs   |  2 +-
 crates/ra_assists/src/handlers/invert_if.rs      | 25 ++--------------------
 crates/ra_assists/src/lib.rs                     |  1 +
 crates/ra_assists/src/utils.rs                   | 27 ++++++++++++++++++++++++
 5 files changed, 32 insertions(+), 26 deletions(-)
 create mode 100644 crates/ra_assists/src/utils.rs

diff --git a/crates/ra_assists/src/handlers/apply_demorgan.rs b/crates/ra_assists/src/handlers/apply_demorgan.rs
index ba08a8223..239807e24 100644
--- a/crates/ra_assists/src/handlers/apply_demorgan.rs
+++ b/crates/ra_assists/src/handlers/apply_demorgan.rs
@@ -1,7 +1,6 @@
-use super::invert_if::invert_boolean_expression;
 use ra_syntax::ast::{self, AstNode};
 
-use crate::{Assist, AssistCtx, AssistId};
+use crate::{utils::invert_boolean_expression, Assist, AssistCtx, AssistId};
 
 // Assist: apply_demorgan
 //
diff --git a/crates/ra_assists/src/handlers/early_return.rs b/crates/ra_assists/src/handlers/early_return.rs
index 8eb3bd473..22f88884f 100644
--- a/crates/ra_assists/src/handlers/early_return.rs
+++ b/crates/ra_assists/src/handlers/early_return.rs
@@ -10,7 +10,7 @@ use ra_syntax::{
 
 use crate::{
     assist_ctx::{Assist, AssistCtx},
-    handlers::invert_if::invert_boolean_expression,
+    utils::invert_boolean_expression,
     AssistId,
 };
 
diff --git a/crates/ra_assists/src/handlers/invert_if.rs b/crates/ra_assists/src/handlers/invert_if.rs
index 983392f21..a594e7e0c 100644
--- a/crates/ra_assists/src/handlers/invert_if.rs
+++ b/crates/ra_assists/src/handlers/invert_if.rs
@@ -1,7 +1,7 @@
-use ra_syntax::ast::{self, make, AstNode};
+use ra_syntax::ast::{self, AstNode};
 use ra_syntax::T;
 
-use crate::{Assist, AssistCtx, AssistId};
+use crate::{utils::invert_boolean_expression, Assist, AssistCtx, AssistId};
 
 // Assist: invert_if
 //
@@ -51,27 +51,6 @@ pub(crate) fn invert_if(ctx: AssistCtx) -> Option<Assist> {
     None
 }
 
-pub(crate) fn invert_boolean_expression(expr: ast::Expr) -> ast::Expr {
-    if let Some(expr) = invert_special_case(&expr) {
-        return expr;
-    }
-    make::expr_prefix(T![!], expr)
-}
-
-pub(crate) fn invert_special_case(expr: &ast::Expr) -> Option<ast::Expr> {
-    match expr {
-        ast::Expr::BinExpr(bin) => match bin.op_kind()? {
-            ast::BinOp::NegatedEqualityTest => bin.replace_op(T![==]).map(|it| it.into()),
-            ast::BinOp::EqualityTest => bin.replace_op(T![!=]).map(|it| it.into()),
-            _ => None,
-        },
-        ast::Expr::PrefixExpr(pe) if pe.op_kind()? == ast::PrefixOp::Not => pe.expr(),
-        // FIXME:
-        // ast::Expr::Literal(true | false )
-        _ => None,
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/crates/ra_assists/src/lib.rs b/crates/ra_assists/src/lib.rs
index 7b08e8fd7..eca6dec4b 100644
--- a/crates/ra_assists/src/lib.rs
+++ b/crates/ra_assists/src/lib.rs
@@ -9,6 +9,7 @@ mod assist_ctx;
 mod marks;
 #[cfg(test)]
 mod doc_tests;
+mod utils;
 pub mod ast_transform;
 
 use std::cmp::Ordering;
diff --git a/crates/ra_assists/src/utils.rs b/crates/ra_assists/src/utils.rs
new file mode 100644
index 000000000..0d5722295
--- /dev/null
+++ b/crates/ra_assists/src/utils.rs
@@ -0,0 +1,27 @@
+//! Assorted functions shared by several assists.
+
+use ra_syntax::{
+    ast::{self, make},
+    T,
+};
+
+pub(crate) fn invert_boolean_expression(expr: ast::Expr) -> ast::Expr {
+    if let Some(expr) = invert_special_case(&expr) {
+        return expr;
+    }
+    make::expr_prefix(T![!], expr)
+}
+
+fn invert_special_case(expr: &ast::Expr) -> Option<ast::Expr> {
+    match expr {
+        ast::Expr::BinExpr(bin) => match bin.op_kind()? {
+            ast::BinOp::NegatedEqualityTest => bin.replace_op(T![==]).map(|it| it.into()),
+            ast::BinOp::EqualityTest => bin.replace_op(T![!=]).map(|it| it.into()),
+            _ => None,
+        },
+        ast::Expr::PrefixExpr(pe) if pe.op_kind()? == ast::PrefixOp::Not => pe.expr(),
+        // FIXME:
+        // ast::Expr::Literal(true | false )
+        _ => None,
+    }
+}
-- 
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