Extract runnables

1 files changed, 74 insertions, 1 deletions

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 {
@@ -15,6 +29,65 @@ 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()
     }