rspec VarSet

lib/rscons/varset.rb

@@ -24,9 +24,9 @@ module Rscons
     #   returned.
     def [](key, type = nil)
       val = @vars[key]
-      if type == :array and val.is_a?(String)
+      if type == :array and not val.is_a?(Array)
         [val]
-      elsif type == :string and val.is_a?(Array)
+      elsif type == :scalar and val.is_a?(Array)
         val.first
       else
         val

spec/rscons/varset_spec.rb

@@ -0,0 +1,114 @@
+module Rscons
+  describe VarSet do
+    describe '.initialize' do
+      it "initializes variables from a Hash" do
+        v = VarSet.new({"one" => 1, "two" => :two})
+        v["one"].should == 1
+        v["two"].should == :two
+      end
+      it "initializes variables from another VarSet" do
+        v = VarSet.new({"one" => 1})
+        v2 = VarSet.new(v)
+        v2["one"].should == 1
+      end
+      it "makes a deep copy of the given VarSet" do
+        v = VarSet.new({"array" => [1, 2, 3]})
+        v2 = VarSet.new(v)
+        v["array"] << 4
+        v["array"].should == [1, 2, 3, 4]
+        v2["array"].should == [1, 2, 3]
+      end
+    end
+
+    describe :[] do
+      v = VarSet.new({"fuz" => "a string", "foo" => 42, "bar" => :baz,
+                      "qax" => [3, 6], "qux" => {a: :b}})
+      it "allows accessing a variable with its verbatim value if type is not specified" do
+        v["fuz"].should == "a string"
+        v["foo"].should == 42
+        v["bar"].should == :baz
+        v["qax"].should == [3, 6]
+        v["qux"].should == {a: :b}
+      end
+      it "allows accessing a non-array converted to an array" do
+        v["fuz", :array].should == ["a string"]
+      end
+      it "allows accessing an array as a single value" do
+        v["qax", :scalar].should == 3
+      end
+    end
+
+    describe :[]= do
+      it "allows assigning to variables" do
+        v = VarSet.new("CFLAGS" => ["-Wall", "-O3"])
+        v["CPPPATH"] = ["one", "two"]
+        v["CFLAGS"].should == ["-Wall", "-O3"]
+        v["CPPPATH"].should == ["one", "two"]
+      end
+    end
+
+    describe '.append' do
+      it "adds values from a Hash to the VarSet" do
+        v = VarSet.new("LDFLAGS" => "-lgcc")
+        v.append("LIBS" => "gcc", "LIBPATH" => ["mylibs"])
+        v.vars.keys.should =~ ["LDFLAGS", "LIBS", "LIBPATH"]
+      end
+      it "adds values from another VarSet to the VarSet" do
+        v = VarSet.new("CPPPATH" => ["mydir"])
+        v2 = VarSet.new("CFLAGS" => ["-O0"], "CPPPATH" => ["different_dir"])
+        v.append(v2)
+        v.vars.keys.should =~ ["CPPPATH", "CFLAGS"]
+        v["CPPPATH"].should == ["different_dir"]
+      end
+    end
+
+    describe '.merge' do
+      it "returns a new VarSet merged with the given Hash" do
+        v = VarSet.new("foo" => "yoda")
+        v2 = v.merge("baz" => "qux")
+        v.vars.keys.should == ["foo"]
+        v2.vars.keys.should =~ ["foo", "baz"]
+      end
+      it "returns a new VarSet merged with the given VarSet" do
+        v = VarSet.new("foo" => ["a", "b"], "bar" => 42)
+        v2 = v.merge(VarSet.new("bar" => 33, "baz" => :baz))
+        v2["foo"] << "c"
+        v["foo"].should == ["a", "b"]
+        v["bar"].should == 42
+        v2["foo"].should == ["a", "b", "c"]
+        v2["bar"].should == 33
+      end
+    end
+
+    describe '.expand_varref' do
+      v = VarSet.new("CFLAGS" => ["-Wall", "-O2"],
+                     "CC" => "gcc",
+                     "CPPPATH" => ["dir1", "dir2"],
+                     "compiler" => "$CC",
+                     "cmd" => ["$CC", "-c", "$CFLAGS", "-I$[CPPPATH]"])
+      it "expands to the string itself if the string is not a variable reference" do
+        v.expand_varref("CC").should == "CC"
+        v.expand_varref("CPPPATH").should == "CPPPATH"
+        v.expand_varref("str").should == "str"
+      end
+      it "expands a single variable reference beginning with a '$'" do
+        v.expand_varref("$CC").should == "gcc"
+        v.expand_varref("$CPPPATH").should == ["dir1", "dir2"]
+      end
+      it "expands a single variable reference in $[arr] notation" do
+        v.expand_varref("prefix$[CFLAGS]suffix").should == ["prefix-Wallsuffix", "prefix-O2suffix"]
+        v.expand_varref(v["cmd"]).should == ["gcc", "-c", "-Wall", "-O2", "-Idir1", "-Idir2"]
+      end
+      it "expands a variable reference recursively" do
+        v.expand_varref("$compiler").should == "gcc"
+        v.expand_varref("$cmd").should == ["gcc", "-c", "-Wall", "-O2", "-Idir1", "-Idir2"]
+      end
+      it "raises an error when array notation is applied to a non-array variable" do
+        expect { v.expand_varref("$[CC]") }.to raise_error /Array.expected/
+      end
+      it "raises an error when a variable reference refers to a non-existent variable" do
+        expect { v.expand_varref("$not_here") }.to raise_error /Could.not.find.variable..not_here/
+      end
+    end
+  end
+end