From 22ebd6cd5cb8e6c3fe43047a35c640a2ee723e70 Mon Sep 17 00:00:00 2001
From: Paul Masurel <paul.masurel@gmail.com>
Date: Wed, 20 Jan 2016 00:21:52 +0900
Subject: [PATCH] blip

---
 src/core/directory.rs | 10 +++++-
 src/core/reader.rs    | 84 +++++++++++++++++++++++--------------------
 src/core/schema.rs    |  6 ++++
 3 files changed, 61 insertions(+), 39 deletions(-)

diff --git a/src/core/directory.rs b/src/core/directory.rs
index 09fad819f..3642ab83d 100644
--- a/src/core/directory.rs
+++ b/src/core/directory.rs
@@ -18,7 +18,6 @@ use std::cell::RefCell;
 use core::error::*;
 use rand::{thread_rng, Rng};
 
-
 #[derive(Clone, Debug)]
 pub struct SegmentId(pub String);
 
@@ -156,3 +155,12 @@ impl SharedMmapMemory {
         SharedMmapMemory(Arc::new(mmap_memory))
     }
 }
+
+impl Borrow<[u8]> for SharedMmapMemory {
+
+    fn borrow(&self) -> &[u8] {
+        let SharedMmapMemory(ref arc) = *self;
+        let mmap: &Mmap = arc.borrow();
+        unsafe { mmap.as_slice() }
+    }
+}
diff --git a/src/core/reader.rs b/src/core/reader.rs
index a2280a739..c1f6e9dee 100644
--- a/src/core/reader.rs
+++ b/src/core/reader.rs
@@ -1,47 +1,55 @@
 use core::directory::Directory;
 use core::directory::Segment;
 use core::schema::Term;
-// use fst::stream::Streamer;
+use core::directory::SharedMmapMemory;
+use fst::Streamer;
 use fst;
+use std::borrow::Borrow;
 
 pub struct SegmentIndexReader {
     segment: Segment,
     term_offsets: fst::Map,
+    postings_data: SharedMmapMemory,
+}
+
+
+impl SegmentIndexReader {
+
+    fn term_cursor<'a>(&'a self) -> SegmentTermCur<'a> {
+        SegmentTermCur {
+            segment: &self.segment,
+            fst_streamer: self.term_offsets.stream(),
+            postings_data: self.postings_data.borrow(),
+        }
+    }
+
+}
+
+
+pub struct SegmentDocCursor<'a> {
+    postings_data: &'a [u8],
+    offset: usize,
+}
+
+struct SegmentTermCur<'a> {
+    segment: &'a Segment,
+    fst_streamer: fst::map::Stream<'a>,
+    postings_data: &'a [u8],
+}
+
+impl<'a> SegmentTermCur<'a> {
+
+    fn next(&mut self,) -> Option<(Term, SegmentDocCursor<'a>)> {
+        match self.fst_streamer.next() {
+            Some((k, offset)) => {
+                let term = Term::from(k);
+                let doc_cursor = SegmentDocCursor {
+                    postings_data: self.postings_data,
+                    offset: offset as usize,
+                };
+                Some((term, doc_cursor))
+            },
+            None => None
+        }
+    }
 }
-//
-// pub struct SegmentDocCursor<'a> {
-//     data: &'a [u8],
-// }
-//
-// struct SegmentTermCur<'a> {
-//     segment: &'a Segment,
-//     fst_streamer: fst::map::Stream<'a>,
-//     term: Term<'a>,
-//
-// }
-//
-// impl<'a> SegmentTermCur<'a> {
-//
-//     fn next(&mut self,) -> Option<(Term<'a>, SegmentDocCursor<'a>)> {
-//         match self.fst_streamer.next() {
-//             Some(_) => None,
-//             None => None
-//         }
-//     }
-// }
-//
-//
-// impl SegmentIndexReader {
-//
-//     fn term_cursor<'a>(&'a self) -> SegmentTermCur<'a> {
-//         let term: Term<'a> {
-//             self.
-//         };
-//         SegmentTermCur {
-//             segment: &self.segment,
-//             fst_streamer: self.term_offsets.stream(),
-//             term:
-//         }
-//     }
-//
-// }
diff --git a/src/core/schema.rs b/src/core/schema.rs
index dfb8673a5..044db69e7 100644
--- a/src/core/schema.rs
+++ b/src/core/schema.rs
@@ -31,6 +31,12 @@ impl Term {
         }
     }
 
+    pub fn from(data: &[u8]) -> Term {
+        Term {
+            data: Vec::from(data),
+        }
+    }
+
     pub fn write_into(&self, buf: &mut Vec<u8>) {
         buf.clear();
         buf.extend(&self.data);