Created
February 20, 2014 14:38
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module Guard | |
@@guards = [] | |
def guard(&block) | |
set_trace_func(lambda {|event, file, line, id, binding, klass| | |
# p [event, file, line, id, binding, klass] | |
case event | |
when "call", "c-call" | |
for g in @@guards | |
g[:count] += 1 | |
end | |
when "return", "c-return" | |
out_of_scope = @@guards.each {|g| | |
g[:count] -= 1 | |
}.select {|g| g[:count] < 0 } | |
@@guards -= out_of_scope | |
for g in out_of_scope | |
g[:block].call | |
end | |
set_trace_func(nil) if @@guards.empty? && id != :set_trace_func | |
end | |
}) if @@guards.empty? | |
@@guards << { | |
block: block, | |
count: 1 | |
} | |
end | |
end | |
include Guard | |
require "rspec" | |
RSpec::Core::Runner.autorun | |
describe Guard do | |
before do | |
@events = [] | |
end | |
it "should execute guard block as it is out of scope" do | |
instance_eval do # new scope | |
@events << :enter | |
guard { @events << :end1 } | |
guard { @events << :end2 } | |
@events << :leave | |
end | |
expect(@events).to eq([ | |
:enter, | |
:leave, | |
:end1, | |
:end2 | |
]) | |
end | |
it "should works correctly with nested scope" do | |
instance_eval do # new scope | |
@events << :enter1 | |
guard { @events << :end1_1 } | |
guard { @events << :end1_2 } | |
instance_eval do | |
@events << :enter2 | |
guard { @events << :end2_1 } | |
guard { @events << :end2_2 } | |
@events << :leave2 | |
end | |
@events << :leave1 | |
end | |
expect(@events).to eq([ | |
:enter1, | |
:enter2, | |
:leave2, | |
:end2_1, | |
:end2_2, | |
:leave1, | |
:end1_1, | |
:end1_2, | |
]) | |
end | |
end |
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