shard-ameba/spec/ameba/ast/scope_spec.cr

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Crystal
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require "../../spec_helper"
module Ameba::AST
describe Scope do
describe "#initialize" do
source = "a = 2"
it "assigns outer scope" do
root = Scope.new as_node(source)
child = Scope.new as_node(source), root
child.outer_scope.should_not be_nil
end
it "assigns node" do
scope = Scope.new as_node(source)
scope.node.should_not be_nil
end
end
end
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describe "delegation" do
it "delegates to_s to node" do
node = as_node("def foo; end")
scope = Scope.new node
scope.to_s.should eq node.to_s
end
it "delegates locations to node" do
node = as_node("def foo; end")
scope = Scope.new node
scope.location.should eq node.location
scope.end_location.should eq node.end_location
end
end
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describe "#references" do
it "can return an empty list of references" do
scope = Scope.new as_node("")
scope.references.should be_empty
end
it "allows to add variable references" do
scope = Scope.new as_node("")
nodes = as_nodes "a = 2"
scope.references << Reference.new(nodes.var_nodes.first, scope)
scope.references.size.should eq 1
end
end
describe "#references?" do
it "returns true if current scope references variable" do
nodes = as_nodes %(
def method
a = 2
block do
3.times { |i| a = a + i }
end
end
)
scope = Scope.new nodes.def_nodes.first
var_node = nodes.var_nodes.first
scope.add_variable var_node
scope.inner_scopes << Scope.new(nodes.block_nodes.first, scope)
variable = Variable.new(var_node, scope)
variable.reference nodes.var_nodes.first, scope.inner_scopes.first
scope.references?(variable).should be_true
end
it "returns false if inner scopes are not checked" do
nodes = as_nodes %(
def method
a = 2
block do
3.times { |i| a = a + i }
end
end
)
scope = Scope.new nodes.def_nodes.first
var_node = nodes.var_nodes.first
scope.add_variable var_node
scope.inner_scopes << Scope.new(nodes.block_nodes.first, scope)
variable = Variable.new(var_node, scope)
variable.reference nodes.var_nodes.first, scope.inner_scopes.first
scope.references?(variable, check_inner_scopes: false).should be_false
end
it "returns false if current scope does not reference variable" do
nodes = as_nodes %(
def method
a = 2
block do
b = 3
3.times { |i| b = b + i }
end
end
)
scope = Scope.new nodes.def_nodes.first
var_node = nodes.var_nodes.first
scope.add_variable var_node
scope.inner_scopes << Scope.new(nodes.block_nodes.first, scope)
variable = Variable.new(var_node, scope)
scope.inner_scopes.first.references?(variable).should be_false
end
end
describe "#add_variable" do
it "adds a new variable to the scope" do
scope = Scope.new as_node("")
scope.add_variable(Crystal::Var.new "foo")
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scope.variables.empty?.should be_false
end
end
describe "#find_variable" do
it "returns the variable in the scope by name" do
scope = Scope.new as_node("foo = 1")
scope.add_variable Crystal::Var.new "foo"
scope.find_variable("foo").should_not be_nil
end
it "returns nil if variable not exist in this scope" do
scope = Scope.new as_node("foo = 1")
scope.find_variable("bar").should be_nil
end
end
describe "#assign_variable" do
it "creates a new assignment" do
scope = Scope.new as_node("foo = 1")
scope.add_variable Crystal::Var.new "foo"
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scope.assign_variable("foo", Crystal::Var.new "foo")
scope.find_variable("foo").not_nil!.assignments.size.should eq 1
end
it "does not create the assignment if variable is wrong" do
scope = Scope.new as_node("foo = 1")
scope.add_variable Crystal::Var.new "foo"
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scope.assign_variable("bar", Crystal::Var.new "bar")
scope.find_variable("foo").not_nil!.assignments.size.should eq 0
end
end
describe "#block?" do
it "returns true if Crystal::Block" do
nodes = as_nodes %(
3.times {}
)
scope = Scope.new nodes.block_nodes.first
scope.block?.should be_true
end
it "returns false otherwise" do
scope = Scope.new as_node "a = 1"
scope.block?.should be_false
end
end
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describe "#spawn_block?" do
it "returns true if a node is a spawn block" do
nodes = as_nodes %(
spawn {}
)
scope = Scope.new nodes.block_nodes.first
scope.spawn_block?.should be_true
end
it "returns false otherwise" do
scope = Scope.new as_node "a = 1"
scope.spawn_block?.should be_false
end
end
describe "#in_macro?" do
it "returns true if Crystal::Macro" do
nodes = as_nodes %(
macro included
end
)
scope = Scope.new nodes.macro_nodes.first
scope.in_macro?.should be_true
end
it "returns true if node is nested to Crystal::Macro" do
nodes = as_nodes %(
macro included
{{@type.each do |type| a = type end}}
end
)
outer_scope = Scope.new nodes.macro_nodes.first
scope = Scope.new nodes.block_nodes.first, outer_scope
scope.in_macro?.should be_true
end
it "returns false otherwise" do
scope = Scope.new as_node "a = 1"
scope.in_macro?.should be_false
end
end
end