1 files changed, 77 insertions, 0 deletions

diff --git a/src/parser/input.rs b/src/parser/input.rs
new file mode 100644
index 000000000..162b9ef5f
--- /dev/null
+++ b/src/parser/input.rs
@@ -0,0 +1,77 @@
+use {SyntaxKind, TextRange, TextUnit, Token};
+use syntax_kinds::EOF;
+use super::is_insignificant;
+
+use std::ops::{Add, AddAssign};
+
+pub(crate) struct ParserInput<'t> {
+    #[allow(unused)]
+    text: &'t str,
+    #[allow(unused)]
+    start_offsets: Vec<TextUnit>,
+    tokens: Vec<Token>, // non-whitespace tokens
+}
+
+impl<'t> ParserInput<'t> {
+    pub fn new(text: &'t str, raw_tokens: &'t [Token]) -> ParserInput<'t> {
+        let mut tokens = Vec::new();
+        let mut start_offsets = Vec::new();
+        let mut len = TextUnit::new(0);
+        for &token in raw_tokens.iter() {
+            if !is_insignificant(token.kind) {
+                tokens.push(token);
+                start_offsets.push(len);
+            }
+            len += token.len;
+        }
+
+        ParserInput {
+            text,
+            start_offsets,
+            tokens,
+        }
+    }
+
+    pub fn kind(&self, pos: InputPosition) -> SyntaxKind {
+        let idx = pos.0 as usize;
+        if !(idx < self.tokens.len()) {
+            return EOF;
+        }
+        self.tokens[idx].kind
+    }
+
+    #[allow(unused)]
+    pub fn text(&self, pos: InputPosition) -> &'t str {
+        let idx = pos.0 as usize;
+        if !(idx < self.tokens.len()) {
+            return "";
+        }
+        let start_offset = self.start_offsets[idx];
+        let end_offset = self.tokens[idx].len;
+        let range = TextRange::from_to(start_offset, end_offset);
+        &self.text[range]
+    }
+}
+
+#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
+pub(crate) struct InputPosition(u32);
+
+impl InputPosition {
+    pub fn new() -> Self {
+        InputPosition(0)
+    }
+}
+
+impl Add<u32> for InputPosition {
+    type Output = InputPosition;
+
+    fn add(self, rhs: u32) -> InputPosition {
+        InputPosition(self.0 + rhs)
+    }
+}
+
+impl AddAssign<u32> for InputPosition {
+    fn add_assign(&mut self, rhs: u32) {
+        self.0 += rhs
+    }
+}