From: MORIOKA Tomohiko <tomo.git@chise.org>
Date: Thu, 18 Apr 2013 02:19:28 +0000 (+0900)
Subject: (cos_skip_space): New function.
X-Git-Url: http://git.chise.org/gitweb/?a=commitdiff_plain;h=0d250fa6fd2825c3cc5a2057b1fb1a7c5bda2b61;p=chise%2Fconcord.git

(cos_skip_space): New function.
(cos_read_int): Fix to support separator.
(cos_read_list0): New function.
(cos_read_list): New function.
(cos_read_object): New function.
---

diff --git a/read.c b/read.c
index f8d0eb2..2e2f7fe 100644
--- a/read.c
+++ b/read.c
@@ -20,6 +20,19 @@
 #include <ctype.h>
 #include "cos-read.h"
 
+int
+cos_skip_space (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  int i = start;
+
+  while ( ( i < len ) && isspace (str[i]) )
+    {
+      i++;
+    }
+  *endp = i;
+  return i;
+}
+
 COS_object
 cos_read_int (unsigned char *str, size_t len, size_t start, size_t* endp)
 {
@@ -57,7 +70,12 @@ cos_read_int (unsigned char *str, size_t len, size_t start, size_t* endp)
 		  dest = dest * 10 + c - '0';
 		  i++;
 		}
-	      else if ( isspace (c) )
+	      else if ( isspace (c)
+			|| ( c == '(' )
+			|| ( c == ')' )
+			|| ( c == '[' )
+			|| ( c == ']' )
+			|| ( c == '"' ) )
 		{
 		  *endp = i;
 		  return cos_make_int ( negative_flag ? - dest : dest );
@@ -174,3 +192,109 @@ cos_read_string (unsigned char *str, size_t len, size_t start, size_t* endp)
     }
   return NULL;
 }
+
+
+static COS_Cons
+cos_read_list0 (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  size_t i = start;
+
+  i = cos_skip_space (str, len, i, endp);
+  if ( len >= start + 1 )
+    {
+      COS_object car = cos_read_object (str, len, i, endp);
+
+      if ( car == NULL )
+	return NULL;
+      i = *endp;
+
+      i = cos_skip_space (str, len, i, endp);
+      if ( str[i] == ')' )
+	{
+	  *endp = i + 1;
+	  return cos_cons (car, cos_Qnil);
+	}
+      else if ( str[i] == '.' )
+	{
+	  COS_object cdr;
+
+	  i++;
+	  if ( isspace (str[i])
+	       || ( str[i] == '"' )
+	       || ( str[i] == '[' )
+	       || ( str[i] == '(' ) )
+	    {
+	      cdr = cos_read_object (str, len, i, endp);
+	      if ( cdr == NULL )
+		return NULL;
+	      i = *endp;
+	      i = cos_skip_space (str, len, i, endp);
+	      if ( str[i] == ')' )
+		{
+		  *endp = i + 1;
+		  return cos_cons (car, cdr);
+		}
+	      cos_release_object (car);
+	      cos_release_object (cdr);
+	      return NULL;
+	    }
+	  else
+	    {
+	      cos_release_object (car);
+	      return NULL;
+	    }
+	}
+      else
+	{
+	  COS_object rest;
+
+	  rest = cos_read_list0 (str, len, i, endp);
+	  if ( rest == NULL )
+	    return NULL;
+	  return cos_cons (car, rest);
+	}
+    }
+  return NULL;
+}
+
+COS_Cons
+cos_read_list (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  size_t i = start;
+
+  i = cos_skip_space (str, len, i, endp);
+  if ( (len >= start + 2) && (str[i++] == '(') )
+    {
+      return cos_read_list0 (str, len, i, endp);
+    }
+  return NULL;
+}
+
+
+COS_object
+cos_read_object (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  COS_object val_obj;
+  int val_cid;
+  COS_String val_str;
+
+  start = cos_skip_space (str, len, start, endp);
+
+  val_obj = cos_read_int (str, len, start, endp);
+  if ( val_obj != NULL )
+    return val_obj;
+
+  val_cid = cos_read_char (str, len, start, endp);
+  if ( val_cid >= 0 )
+    return cos_make_char (val_cid);
+
+  val_str = cos_read_string (str, len, start, endp);
+  if ( val_str != NULL )
+    return val_str;
+
+  val_obj = cos_read_list (str, len, start, endp);
+  if ( val_obj != NULL )
+    return val_obj;
+
+  return NULL;
+}