1 files changed, 2 insertions, 1 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index 59708150..e211d318 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -35,10 +35,11 @@ function isAlnum(c) { return isAlpha(c) || isDigit(c); }
 function isBlank(c) { return c == ' ' || c == '\t'; }
 function isSpace(c) { return isBlank(c) || c == '\r' || c == '\n'; }
 function isXdigit(c) { return isDigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'); }
+function ord(c) { return c.charCodeAt(0); }
+function isPrint(c) { return ord(c) > 31 && ord(c) < 127; }
 function toLower(c) { return c.toLowerCase(); }
 function toUpper(c) { return c.toUpperCase(); }
 
-
 // Lists
 
 function cons(v, ls) {