parser: basic support for trait uses in classes

phpast/samples/class-use.php

@@ -0,0 +1,9 @@
+<?php
+
+trait Foo {
+
+}
+
+class Bar {
+    use Foo;
+}

trunk_parser/src/ast.rs

@@ -113,6 +113,8 @@ impl From<TokenKind> for ClassFlag {
     }
 }
 
+
+
 #[derive(Debug, PartialEq, Clone, Serialize)]
 pub enum Statement {
     InlineHtml(String),
@@ -150,6 +152,9 @@ pub enum Statement {
         name: Identifier,
         body: Block,
     },
+    TraitUse {
+        traits: Vec<Identifier>,
+    },
     Interface {
         name: Identifier,
         extends: Vec<Identifier>,

trunk_parser/src/parser/mod.rs

@@ -483,6 +483,24 @@ impl Parser {
     
     fn class_statement(&mut self) -> ParseResult<Statement> {
         match self.current.kind {
+            TokenKind::Use => {
+                self.next();
+
+                let mut traits = Vec::new();
+
+                while self.current.kind != TokenKind::SemiColon {
+                    if self.current.kind == TokenKind::Comma {
+                        self.next();
+                    }
+
+                    let t = expect!(self, TokenKind::Identifier(i) | TokenKind::QualifiedIdentifier(i) | TokenKind::FullyQualifiedIdentifier(i), i, "expected identifier");
+                    traits.push(t.into());
+                }
+
+                expect!(self, TokenKind::SemiColon, "expected semi-colon");
+
+                Ok(Statement::TraitUse { traits })
+            },
             TokenKind::Const => {
                 self.next();