Fixes line_width: -1 handling #254

libyaml understands -1 as unlimited:
https://github.com/tenderlove/psych/blob/master/ext/psych/yaml/yaml.h#L1864

Raises on other negative values.

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/psych/visitors/yaml_tree.rb b/lib/psych/visitors/yaml_tree.rb
index 63e14da..6ad30d2 100644
--- a/lib/psych/visitors/yaml_tree.rb
+++ b/lib/psych/visitors/yaml_tree.rb
@@ -70,6 +70,14 @@ module Psych
         @ss         = ss
         @options    = options
         @line_width = options[:line_width]
+        if @line_width && @line_width < 0
+          if @line_width == -1
+            # Treat -1 as unlimited line-width, same as libyaml does.
+            @line_width = nil
+          else
+            fail(ArgumentError, "Invalid line_width #{@line_width}, must be non-negative or -1 for unlimited.")
+          end
+        end
         @coders     = []
 
         @dispatch_cache = Hash.new do |h,klass|