From 7c67612b8a894187fa3b64725531a5459f9211bf Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Fri, 10 Aug 2018 22:33:29 +0300
Subject: organizize

---
 crates/libsyntax2/src/ast/mod.rs | 74 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 crates/libsyntax2/src/ast/mod.rs

(limited to 'crates/libsyntax2/src/ast/mod.rs')

diff --git a/crates/libsyntax2/src/ast/mod.rs b/crates/libsyntax2/src/ast/mod.rs
new file mode 100644
index 000000000..eeb7ae6f6
--- /dev/null
+++ b/crates/libsyntax2/src/ast/mod.rs
@@ -0,0 +1,74 @@
+mod generated;
+
+use std::sync::Arc;
+use {
+    SyntaxNode, SyntaxRoot, TreeRoot, SyntaxError,
+    SyntaxKind::*,
+};
+pub use self::generated::*;
+
+pub trait AstNode<R: TreeRoot>: Sized {
+    fn cast(syntax: SyntaxNode<R>) -> Option<Self>;
+    fn syntax(&self) -> &SyntaxNode<R>;
+}
+
+impl File<Arc<SyntaxRoot>> {
+    pub fn parse(text: &str) -> Self {
+        File::cast(::parse(text)).unwrap()
+    }
+}
+
+impl<R: TreeRoot> File<R> {
+    pub fn errors(&self) -> Vec<SyntaxError> {
+        self.syntax().root.errors.clone()
+    }
+
+    pub fn functions<'a>(&'a self) -> impl Iterator<Item = Function<R>> + 'a {
+        self.syntax()
+            .children()
+            .filter_map(Function::cast)
+    }
+}
+
+impl<R: TreeRoot> Function<R> {
+    pub fn name(&self) -> Option<Name<R>> {
+        self.syntax()
+            .children()
+            .filter_map(Name::cast)
+            .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()
+    }
+}
-- 
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