From c12450fb4e30c3418555e47d045bb9fd4318a10a Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 29 Jul 2018 13:51:55 +0300
Subject: Introduce red-green syntax tree

---
 src/parser/event.rs |  8 ++++++--
 src/parser/mod.rs   | 29 +++++++++++++++++++++++++----
 2 files changed, 31 insertions(+), 6 deletions(-)

(limited to 'src/parser')

diff --git a/src/parser/event.rs b/src/parser/event.rs
index ac8a55de9..0fbfaeb9f 100644
--- a/src/parser/event.rs
+++ b/src/parser/event.rs
@@ -1,5 +1,5 @@
 use {
-    ErrorMsg, File, FileBuilder, Sink, SyntaxKind, Token,
+    ErrorMsg, File, FileBuilder, Sink, SyntaxKind, Token, GreenBuilder,
     syntax_kinds::TOMBSTONE,
 };
 use super::is_insignificant;
@@ -69,6 +69,11 @@ pub(crate) enum Event {
 
 pub(super) fn to_file(text: String, tokens: &[Token], events: Vec<Event>) -> File {
     let mut builder = FileBuilder::new(text);
+    process(&mut builder, tokens, events);
+    builder.finish()
+}
+
+pub(super) fn process(builder: &mut Sink, tokens: &[Token], events: Vec<Event>) {
     let mut idx = 0;
 
     let mut holes = Vec::new();
@@ -145,5 +150,4 @@ pub(super) fn to_file(text: String, tokens: &[Token], events: Vec<Event>) -> Fil
             &Event::Error { ref msg } => builder.error(ErrorMsg { msg: msg.clone() }),
         }
     }
-    builder.finish()
 }
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index 3814837e1..26fbb6e3d 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -1,7 +1,3 @@
-use {File, SyntaxKind, Token};
-
-use syntax_kinds::*;
-
 #[macro_use]
 mod token_set;
 mod parser;
@@ -9,6 +5,16 @@ mod input;
 mod event;
 mod grammar;
 
+use std::sync::Arc;
+use {
+    File, SyntaxKind, Token,
+    yellow::SyntaxNode,
+    syntax_kinds::*
+};
+use GreenBuilder;
+use parser::event::process;
+
+
 /// Parse a sequence of tokens into the representative node tree
 pub fn parse(text: String, tokens: &[Token]) -> File {
     let events = {
@@ -21,6 +27,21 @@ pub fn parse(text: String, tokens: &[Token]) -> File {
     event::to_file(text, tokens, events)
 }
 
+/// Parse a sequence of tokens into the representative node tree
+pub fn parse_green(text: String, tokens: &[Token]) -> SyntaxNode {
+    let events = {
+        let input = input::ParserInput::new(&text, tokens);
+        let parser_impl = parser::imp::ParserImpl::new(&input);
+        let mut parser = parser::Parser(parser_impl);
+        grammar::file(&mut parser);
+        parser.0.into_events()
+    };
+    let mut builder = GreenBuilder::new(text);
+    process(&mut builder, tokens, events);
+    let (green, errors) = builder.finish();
+    SyntaxNode::new(Arc::new(green), errors)
+}
+
 fn is_insignificant(kind: SyntaxKind) -> bool {
     match kind {
         WHITESPACE | COMMENT => true,
-- 
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