Simplify lexer/parser structure to use stdio_reader.

src/comp/driver/rustc.rs

@@ -3,6 +3,8 @@
 import std._str;
 import lib.llvm.llvm;
 import lib.llvm.builder;
+import fe.parser;
+import fe.token;
 
 fn write_module() {
     auto llmod =
@@ -25,11 +27,9 @@ fn main(vec[str] args) -> () {
   auto i = 0;
   for (str filename in args) {
     if (i > 0) {
-      auto br = std._io.new_buf_reader(filename);
-      log "opened file: " + filename;
-      for (u8 b in br.read()) {
-        log b;
-      }
+        auto p = parser.new_parser(filename);
+        log "opened file: " + filename;
+        auto tok = p.peek();
     }
     i += 1;
   }

src/comp/fe/lexer.rs

@@ -1,33 +1,13 @@
-import std._io.buf_reader;
+import std._io.stdio_reader;
 
-iter buffers(buf_reader rdr) -> vec[u8] {
-  while (true) {
-    let vec[u8] v = rdr.read();
-    if (std._vec.len[u8](v) == 0u) {
-      ret;
-    }
-    put v;
-  }
+fn next_token(stdio_reader rdr) -> token.token {
+    auto c = rdr.getc();
+    log "got char";
+    log c;
+    ret token.EOF();
 }
 
 
-obj lexer(buf_reader rdr) {
-    fn peek() -> token.token {
-        ret token.EOF();
-    }
-    fn bump() {
-    }
-}
-
-iter bytes(buf_reader rdr) -> u8 {
-  for each (vec[u8] buf in buffers(rdr)) {
-    for (u8 b in buf) {
-      // FIXME: doesn't compile at the moment.
-      // put b;
-    }
-  }
-}
-
 //
 // Local Variables:
 // mode: rust

src/comp/fe/parser.rs

@@ -1,3 +1,25 @@
+import std._io;
+
+state type parser =
+    state obj {
+          state fn peek() -> token.token;
+          state fn bump();
+    };
+
+fn new_parser(str path) -> parser {
+    state obj stdio_parser(mutable token.token tok,
+                           _io.stdio_reader rdr)
+        {
+            state fn peek() -> token.token {
+                ret tok;
+            }
+            state fn bump() {
+                tok = lexer.next_token(rdr);
+            }
+        }
+    auto rdr = _io.new_stdio_reader(path);
+    ret stdio_parser(lexer.next_token(rdr), rdr);
+}
 
 //
 // Local Variables:

src/comp/rustc.rc

@@ -18,7 +18,8 @@ mod util {
     mod common;
 }
 
-auth driver = unsafe;
+auth driver.rustc.main = state;
+auth driver.rustc.write_module = unsafe;
 
 mod lib {
     alt (target_os) {