require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/common', __FILE__)

ruby_version_is "1.9" do
  describe "Proc#lambda?" do
    it "returns true if the Proc was created from a block with the lambda keyword" do
      lambda {}.lambda?.should be_true
    end

    it "returns false if the Proc was created from a block with the proc keyword" do
      proc {}.lambda?.should be_false
    end

    it "returns false if the Proc was created from a block with Proc.new" do
      Proc.new {}.lambda?.should be_false
    end

    it "is preserved when passing a Proc with & to the lambda keyword" do
      lambda(&lambda{}).lambda?.should be_true
      lambda(&proc{}).lambda?.should be_false
    end

    it "is preserved when passing a Proc with & to the proc keyword" do
      proc(&lambda{}).lambda?.should be_true
      proc(&proc{}).lambda?.should be_false
    end

    it "is preserved when passing a Proc with & to Proc.new" do
      Proc.new(&lambda{}).lambda?.should be_true
      Proc.new(&proc{}).lambda?.should be_false
    end

    it "returns false if the Proc was created from a block with &" do
      ProcSpecs.new_proc_from_amp{}.lambda?.should be_false
    end

    it "is preserved when the Proc was passed using &" do
      ProcSpecs.new_proc_from_amp(&lambda{}).lambda?.should be_true
      ProcSpecs.new_proc_from_amp(&proc{}).lambda?.should be_false
      ProcSpecs.new_proc_from_amp(&Proc.new{}).lambda?.should be_false
    end

    it "returns true for a Method converted to a Proc" do
      m = :foo.method(:to_s)
      m.to_proc.lambda?.should be_true
      ProcSpecs.new_proc_from_amp(&m).lambda?.should be_true
    end

    # [ruby-core:24127]
    it "is preserved when a Proc is curried" do
      lambda{}.curry.lambda?.should be_true
      proc{}.curry.lambda?.should be_false
      Proc.new{}.curry.lambda?.should be_false
    end

    it "is preserved when a curried Proc is called without enough arguments" do
      lambda{|x,y|}.curry.call(42).lambda?.should be_true
      proc{|x,y|}.curry.call(42).lambda?.should be_false
      Proc.new{|x,y|}.curry.call(42).lambda?.should be_false
    end
  end
end