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-rw-r--r--ext/psych/lib/psych/visitors/yaml_tree.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/psych/lib/psych/visitors/yaml_tree.rb b/ext/psych/lib/psych/visitors/yaml_tree.rb
index cfed8f1..f44e973 100644
--- a/ext/psych/lib/psych/visitors/yaml_tree.rb
+++ b/ext/psych/lib/psych/visitors/yaml_tree.rb
@@ -304,7 +304,7 @@ module Psych
quote = false
elsif @line_width && o.length > @line_width
style = Nodes::Scalar::FOLDED
- elsif o =~ /^[^[:word:]][^"]*$/
+ elsif o =~ /^[^[:word:]][^"]*$/ or o =~ /^([^"]*'+[^"]*)+$/
style = Nodes::Scalar::DOUBLE_QUOTED
elsif not String === @ss.tokenize(o) or /\A0[0-7]*[89]/ =~ o
style = Nodes::Scalar::SINGLE_QUOTED