1 files changed, 52 insertions, 0 deletions

diff --git a/src/parser/event_parser/parser.rs b/src/parser/event_parser/parser.rs
new file mode 100644
index 000000000..9592b90c9
--- /dev/null
+++ b/src/parser/event_parser/parser.rs
@@ -0,0 +1,52 @@
+use {Token, SyntaxKind, TextUnit};
+use super::Event;
+use syntax_kinds::{WHITESPACE, COMMENT};
+
+pub struct Parser<'t> {
+    text: &'t str,
+    raw_tokens: &'t [Token],
+    non_ws_tokens: Vec<(usize, TextUnit)>,
+
+    pos: usize,
+    events: Vec<Event>,
+}
+
+impl<'t> Parser<'t> {
+    pub(crate) fn new(text: &'t str, raw_tokens: &'t [Token]) -> Parser<'t> {
+        let mut non_ws_tokens = Vec::new();
+        let mut len = TextUnit::new(0);
+        for (idx, &token) in raw_tokens.iter().enumerate() {
+            match token.kind {
+                WHITESPACE | COMMENT => (),
+                _ => non_ws_tokens.push((idx, len)),
+            }
+            len += token.len;
+        }
+
+        Parser {
+            text,
+            raw_tokens,
+            non_ws_tokens,
+
+            pos: 0,
+            events: Vec::new(),
+        }
+    }
+
+    pub(crate) fn into_events(self) -> Vec<Event> {
+        assert!(self.pos == self.non_ws_tokens.len());
+        self.events
+    }
+
+    pub(crate) fn start(&mut self, kind: SyntaxKind) {
+        self.event(Event::Start { kind });
+    }
+
+    pub(crate) fn finish(&mut self) {
+        self.event(Event::Finish);
+    }
+
+    fn event(&mut self, event: Event) {
+        self.events.push(event)
+    }
+}
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