From 36bd28633baf6015b767e9e70d2d53185271db50 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 9 Aug 2018 16:03:21 +0300
Subject: Extract runnables

---
 libeditor/src/lib.rs    | 34 ++++++++++++++++++++++
 libeditor/tests/test.rs | 22 +++++++++++++++
 src/ast.rs              | 75 ++++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 130 insertions(+), 1 deletion(-)

diff --git a/libeditor/src/lib.rs b/libeditor/src/lib.rs
index ef31efe35..387859d4a 100644
--- a/libeditor/src/lib.rs
+++ b/libeditor/src/lib.rs
@@ -26,6 +26,18 @@ pub struct Symbol {
     pub range: TextRange,
 }
 
+#[derive(Debug)]
+pub struct Runnable {
+    pub range: TextRange,
+    pub kind: RunnableKind,
+}
+
+#[derive(Debug)]
+pub enum RunnableKind {
+    Test { name: String },
+    Bin,
+}
+
 impl File {
     pub fn new(text: &str) -> File {
         File {
@@ -78,6 +90,28 @@ impl File {
         let syntax = self.inner.syntax();
         extend_selection::extend_selection(syntax.as_ref(), range)
     }
+
+    pub fn runnables(&self) -> Vec<Runnable> {
+        self.inner
+            .functions()
+            .filter_map(|f| {
+                let name = f.name()?.text();
+                let kind = if name == "main" {
+                    RunnableKind::Bin
+                } else if f.has_atom_attr("test") {
+                    RunnableKind::Test {
+                        name: name.to_string()
+                    }
+                } else {
+                    return None;
+                };
+                Some(Runnable {
+                    range: f.syntax().range(),
+                    kind,
+                })
+            })
+            .collect()
+    }
 }
 
 
diff --git a/libeditor/tests/test.rs b/libeditor/tests/test.rs
index e1c8aee4b..ab8254d16 100644
--- a/libeditor/tests/test.rs
+++ b/libeditor/tests/test.rs
@@ -37,11 +37,33 @@ fn main() {}
     );
 }
 
+#[test]
+fn test_runnables() {
+    let file = file(r#"
+fn main() {}
+
+#[test]
+fn test_foo() {}
+
+#[test]
+#[ignore]
+fn test_foo() {}
+"#);
+    let runnables = file.runnables();
+    dbg_eq(
+        &runnables,
+        r#"[Runnable { range: [1; 13), kind: Bin },
+            Runnable { range: [15; 39), kind: Test { name: "test_foo" } },
+            Runnable { range: [41; 75), kind: Test { name: "test_foo" } }]"#,
+    )
+}
+
 fn file(text: &str) -> File {
     File::new(text)
 }
 
 fn dbg_eq(actual: &impl fmt::Debug, expected: &str) {
+    let actual = format!("{:?}", actual);
     let expected = expected.lines().map(|l| l.trim()).join(" ");
     assert_eq!(actual, expected);
 }
diff --git a/src/ast.rs b/src/ast.rs
index caf5fb7ef..a595b9324 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -1,11 +1,25 @@
 use std::sync::Arc;
-use {SyntaxNode, SyntaxRoot, TreeRoot};
+use {
+    SyntaxNode, SyntaxRoot, TreeRoot,
+    SyntaxKind::*,
+};
 
 #[derive(Debug)]
 pub struct File<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
 }
 
+#[derive(Debug)]
+pub struct Function<R: TreeRoot = Arc<SyntaxRoot>> {
+    syntax: SyntaxNode<R>,
+}
+
+#[derive(Debug)]
+pub struct Name<R: TreeRoot = Arc<SyntaxRoot>> {
+    syntax: SyntaxNode<R>,
+}
+
+
 impl File<Arc<SyntaxRoot>> {
     pub fn parse(text: &str) -> Self {
         File {
@@ -14,6 +28,65 @@ impl File<Arc<SyntaxRoot>> {
     }
 }
 
+impl<R: TreeRoot> File<R> {
+    pub fn functions<'a>(&'a self) -> impl Iterator<Item = Function<R>> + 'a {
+        self.syntax
+            .children()
+            .filter(|node| node.kind() == FN_ITEM)
+            .map(|node| Function { syntax: node })
+    }
+}
+
+impl<R: TreeRoot> Function<R> {
+    pub fn syntax(&self) -> SyntaxNode<R> {
+        self.syntax.clone()
+    }
+
+    pub fn name(&self) -> Option<Name<R>> {
+        self.syntax
+            .children()
+            .filter(|node| node.kind() == NAME)
+            .map(|node| Name { syntax: node })
+            .next()
+    }
+
+    pub fn has_atom_attr(&self, atom: &str) -> bool {
+        self.syntax
+            .children()
+            .filter(|node| node.kind() == ATTR)
+            .any(|attr| {
+                let mut metas = attr.children().filter(|node| node.kind() == META_ITEM);
+                let meta = match metas.next() {
+                    None => return false,
+                    Some(meta) => {
+                        if metas.next().is_some() {
+                            return false;
+                        }
+                        meta
+                    }
+                };
+                let mut children = meta.children();
+                match children.next() {
+                    None => false,
+                    Some(child) => {
+                        if children.next().is_some() {
+                            return false;
+                        }
+                        child.kind() == IDENT && child.text() == atom
+                    }
+                }
+            })
+    }
+}
+
+impl<R: TreeRoot> Name<R> {
+    pub fn text(&self) -> String {
+        self.syntax.text()
+    }
+}
+
+
+
 impl<R: TreeRoot> File<R> {
     pub fn syntax(&self) -> SyntaxNode<R> {
         self.syntax.clone()
-- 
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