Add custom parser / custom validation example

1 files changed, 39 insertions, 0 deletions

diff --git a/examples/custom_parser_custom_validator.rb b/examples/custom_parser_custom_validator.rb
new file mode 100644
index 0000000..0744e7b
--- /dev/null
+++ b/examples/custom_parser_custom_validator.rb
@@ -0,0 +1,39 @@
+require 'highline'
+
+cli = HighLine.new
+
+# The parser
+class ArrayOfNumbersFromString
+  def self.parse(string)
+    string.scan(/\d+/).map(&:to_i)
+  end
+end
+
+# The validator
+class ArrayOfNumbersFromStringInRange
+  def self.in?(range)
+    new(range)
+  end
+
+  attr_reader :range
+
+  def initialize(range)
+    @range = range
+  end
+
+  def valid?(answer)
+    ary = ArrayOfNumbersFromString.parse(answer)
+    ary.all? ->(number) { range.include? number }
+  end
+
+  def inspect
+    "in range #@range validator"
+  end
+end
+
+answer = cli.ask("Which number? (0 or <Enter> to skip): ", ArrayOfNumbersFromString) { |q|
+  q.validate = ArrayOfNumbersFromStringInRange.in?(0..10)
+  q.default = 0
+}
+
+puts "Your answer was: #{answer} and it was correctly validated and coerced into an #{answer.class}"