crib/samples/ruby.rb

#!/usr/bin/env ruby
# Ruby syntax highlighting test

=begin
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  Good for testing highlighting.

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=end

# Constants
PI = 3.14159
MAX_ITER = 5

# Module
module Utilities
  def self.random_greeting
    ["Hello", "Hi", "Hey", "Hola", "Bonjour", "Merhaba"].sample
  end

  def self.factorial(n)
    return 1 if n <= 1
    n * factorial(n - 1)
  end
end

# Class
class TestObject
  attr_accessor :name, :value

  def initialize(name, value)
    @name = name
    @value = value
  end

  def display
    puts "#{@name}: #{@value}"
  end

  def double_value
    @value * 2
  end
end

# Inheritance
class SpecialObject < TestObject
  def triple_value
    @value * 3
  end
end

# Lambda
adder = ->(x, y) { x + y }

# Array and hash
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
hash = { a: 1, b: 2, c: 3 }

# Iteration
numbers.each do |n|
  puts "Number: #{n}"
end

# Hash iteration
hash.each do |key, value|
  puts "#{key} => #{value}"
end

# Conditional
numbers.each do |n|
  if n.even?
    puts "#{n} is even"
  else
    puts "#{n} is odd"
  end
end

# Method definition
def greet_person(name)
  puts "#{Utilities.random_greeting}, #{name}!"
end

# Calling methods
greet_person("Alice")
greet_person("Bob")

# Loops
i = 0
while i < 5
  puts "Loop iteration #{i}"
  i += 1
end

for j in 1..3
  puts "For loop #{j}"
end

# Begin-rescue-ensure
begin
  risky = 10 / 2
  puts "Risky operation succeeded: #{risky}"
rescue ZeroDivisionError => e
  puts "Caught an error: #{e}"
ensure
  puts "This runs no matter what"
end

# Arrays of objects
objs = []
5.times do |k|
  objs << TestObject.new("Obj#{k}", k)
end

objs.each(&:display)

# Nested arrays
nested = [[1, 2], [3, 4], [5, 6]]
nested.each do |arr|
  arr.each { |x| print "#{x} " }
  puts
end

# Case statement
numbers.each do |n|
  case n
  when 1..3
    puts "#{n} is small"
  when 4..7
    puts "#{n} is medium"
  else
    puts "#{n} is large"
  end
end

# Using factorial
(0..5).each do |n|
  puts "Factorial of #{n} is #{Utilities.factorial(n)}"
end

# Special objects
so = SpecialObject.new("Special", 10)
puts "Double: #{so.double_value}, Triple: #{so.triple_value}"

# String interpolation and formatting
puts "PI is approximately #{PI.round(2)}"

# Multi-line strings
multi_line = <<~TEXT
  This is a multi-line string.
  It spans multiple lines.
  Good for testing highlighting.
TEXT

puts multi_line

# Symbols and strings
sym = :my_symbol
str = "my string"
puts "Symbol: #{sym}, String: #{str}"

# Random numbers
rand_nums = Array.new(5) { rand(100) }
puts "Random numbers: #{rand_nums.join(', ')}"

# More loops
rand_nums.each_with_index do |num, idx|
  puts "Index #{idx} has number #{num}"
end

# Ternary operator
rand_nums.each do |num|
  puts num.even? ? "#{num} is even" : "#{num} is odd"
end

# Block with yield
def wrapper
  puts "Before block"
  yield if block_given?
  puts "After block"
end

wrapper { puts "Inside block" }

# Sorting
sorted = rand_nums.sort
puts "Sorted: #{sorted.join(', ')}"

# Regex
sample_text = "The quick brown fox jumps over the lazy dog"
puts "Match 'fox'?" if sample_text =~ /fox/

# End of test script
puts "Ruby syntax highlighting test complete."