add decimal number to toplevel readtable

read.scm

@@ -34,6 +34,16 @@
 ;;; 
 ;;; All tokens are procedure-encapsulated objects, since the reader should
 ;;; never return a literal procedure. Each procedure has a TYPE message.
+;;; 
+;;; ;;;;;;;;;;;;;;;
+;;; Possible Improvements
+;;; ;;;;;;;;;;;;;;;
+;;; 
+;;; * A coherent API.
+;;; * regex-based lexer.
+;;; * A way to load readtables and read functions when the function is run,
+;;;   and not when functions are defined, without sacrificing performance.
+;;; * Better Unicode handling.
 
 (load "chez-compat.scm")
 (load "util.scm")
@@ -948,6 +958,14 @@
                           port)))
    (list readtable:update %bol readtable:vector)))
 
+;;; Read a decimal number without prefixes.
+(define readtable:create-number
+  (lambda (toplevel number-char _ port)
+    (readtable:act readtable:read-sign
+                   number-char
+                   (read:number-builder readtable:for-dec)
+                   port)))
+
 ;;; ;;;;;;;;;;;;;;;;
 ;;; Toplevel reader.
 ;;; ;;;;;;;;;;;;;;;;
@@ -963,6 +981,8 @@
      (list readtable:update %eol (readtable:error 'top "unbalanced list"))
      (list readtable:update #\# (readtable:next/old-as-acc
                                  readtable:hash))
+     (list readtable:update '(#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9)
+           readtable:create-number)
      (list readtable:update #\;
            (readtable:jump-discard readtable:read-to-newline)))))
 
@@ -1061,3 +1081,4 @@
 (read-all "#e10.5")
 (read-all "#d10.24f12")
 (read-all "#d-i")
+(read-all "100i")