lib/parser_base: intro `StringProcessor::eof` and fix index error

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/parser_base.nit b/lib/parser_base.nit
index 234b733..f97fbf0 100644 (file)
--- a/lib/parser_base.nit
+++ b/lib/parser_base.nit
@@ -101,12 +101,15 @@ class StringProcessor
 
        # Ignores any printable character until a whitespace is encountered
        protected fun ignore_until_whitespace: Int do
-               while not src[pos].is_whitespace do pos += 1
+               while src.length > pos and not src[pos].is_whitespace do pos += 1
                return pos
        end
 
        # Returns the current location as a `Location` object
        protected fun hot_location: Location do return new Location(line, line_offset)
+
+       # Is `pos` at the end of the source?
+       protected fun eof: Bool do return pos >= src.length
 end
 
 # Information about the location of an entity in a source document