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require File.dirname(__FILE__) + '/../spec_helper'
# while bool-expr [do]
# body
# end
#
# begin
# body
# end while bool-expr
#
# expr while bool-expr
describe "The while expression" do
it "runs while the expression is true" do
i = 0
while i < 3
i += 1
end
i.should == 3
end
it "optionally takes a 'do' after the expression" do
i = 0
while i < 3 do
i += 1
end
i.should == 3
end
it "allows body begin on the same line if do is used" do
i = 0
while i < 3 do i += 1
end
i.should == 3
end
it "executes code in containing variable scope" do
i = 0
while i != 1
a = 123
i = 1
end
a.should == 123
end
it "executes code in containing variable scope with 'do'" do
i = 0
while i != 1 do
a = 123
i = 1
end
a.should == 123
end
it "returns nil if ended when condition became false" do
i = 0
while i < 3
i += 1
end.should == nil
end
it "does not evaluate the body if expression is empty" do
a = []
while ()
a << :body_evaluated
end
a.should == []
end
it "stops running body if interrupted by break" do
i = 0
while i < 10
i += 1
break if i > 5
end
i.should == 6
end
it "returns value passed to break if interrupted by break" do
while true
break 123
end.should == 123
end
it "returns nil if interrupted by break with no arguments" do
while true
break
end.should == nil
end
it "skips to end of body with next" do
a = []
i = 0
while (i+=1)<5
next if i==3
a << i
end
a.should == [1, 2, 4]
end
it "restarts the current iteration without reevaluating condition with redo" do
a = []
i = 0
j = 0
while (i+=1)<3
a << i
j+=1
redo if j<3
end
a.should == [1, 1, 1, 2]
end
end
describe "The while modifier" do
it "runs preceding statement while the condition is true" do
i = 0
i += 1 while i < 3
i.should == 3
end
it "evaluates condition before statement execution" do
a = []
i = 0
a << i while (i+=1) < 3
a.should == [1, 2]
end
it "does not run preceding statement if the condition is false" do
i = 0
i += 1 while false
i.should == 0
end
it "does not run preceding statement if the condition is empty" do
i = 0
i += 1 while ()
i.should == 0
end
it "returns nil if ended when condition became false" do
i = 0
(i += 1 while i<10).should == nil
end
it "returns value passed to break if interrupted by break" do
(break 123 while true).should == 123
end
it "returns nil if interrupted by break with no arguments" do
(break while true).should == nil
end
it "skips to end of body with next" do
i = 0
j = 0
((i+=1) == 3 ? next : j+=i) while i <= 10
j.should == 63
end
it "restarts the current iteration without reevaluating condition with redo" do
i = 0
j = 0
(i+=1) == 4 ? redo : j+=i while (i+=1) <= 10
j.should == 34
end
end
describe "The while modifier with begin .. end block" do
it "runs block while the expression is true" do
i = 0
begin
i += 1
end while i < 3
i.should == 3
end
it "stops running block if interrupted by break" do
i = 0
begin
i += 1
break if i > 5
end while i < 10
i.should == 6
end
it "returns value passed to break if interrupted by break" do
(begin; break 123; end while true).should == 123
end
it "returns nil if interrupted by break with no arguments" do
(begin; break; end while true).should == nil
end
it "runs block at least once (even if the expression is false)" do
i = 0
begin
i += 1
end while false
i.should == 1
end
it "evaluates condition after block execution" do
a = []
i = 0
begin
a << i
end while (i+=1)<5
a.should == [0, 1, 2, 3, 4]
end
it "skips to end of body with next" do
a = []
i = 0
begin
next if i==3
a << i
end while (i+=1)<5
a.should == [0, 1, 2, 4]
end
it "restarts the current iteration without reevaluting condition with redo" do
a = []
i = 0
j = 0
begin
a << i
j+=1
redo if j<3
end while (i+=1)<3
a.should == [0, 0, 0, 1, 2]
end
end
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