Add soong_build primary builder

Initial build logic for building android with soong.  It can build
a variety of C and C++ files for arm/arm64 and host.

Change-Id: I10eb37c2c2a50be6af1bb5fd568c0962b9476bf0

androidmk/parser/make_strings_test.go

@@ -0,0 +1,96 @@
+package parser
+
+import (
+	"strings"
+	"testing"
+)
+
+var splitNTestCases = []struct {
+	in       *MakeString
+	expected []*MakeString
+	sep      string
+	n        int
+}{
+	{
+		in: &MakeString{
+			strings: []string{
+				"a b c",
+				"d e f",
+				" h i j",
+			},
+			variables: []Variable{
+				variable{name: SimpleMakeString("var1")},
+				variable{name: SimpleMakeString("var2")},
+			},
+		},
+		sep: " ",
+		n:   -1,
+		expected: []*MakeString{
+			SimpleMakeString("a"),
+			SimpleMakeString("b"),
+			&MakeString{
+				strings: []string{"c", "d"},
+				variables: []Variable{
+					variable{name: SimpleMakeString("var1")},
+				},
+			},
+			SimpleMakeString("e"),
+			&MakeString{
+				strings: []string{"f", ""},
+				variables: []Variable{
+					variable{name: SimpleMakeString("var2")},
+				},
+			},
+			SimpleMakeString("h"),
+			SimpleMakeString("i"),
+			SimpleMakeString("j"),
+		},
+	},
+	{
+		in: &MakeString{
+			strings: []string{
+				"a b c",
+				"d e f",
+				" h i j",
+			},
+			variables: []Variable{
+				variable{name: SimpleMakeString("var1")},
+				variable{name: SimpleMakeString("var2")},
+			},
+		},
+		sep: " ",
+		n:   3,
+		expected: []*MakeString{
+			SimpleMakeString("a"),
+			SimpleMakeString("b"),
+			&MakeString{
+				strings: []string{"c", "d e f", " h i j"},
+				variables: []Variable{
+					variable{name: SimpleMakeString("var1")},
+					variable{name: SimpleMakeString("var2")},
+				},
+			},
+		},
+	},
+}
+
+func TestMakeStringSplitN(t *testing.T) {
+	for _, test := range splitNTestCases {
+		got := test.in.SplitN(test.sep, test.n)
+		gotString := dumpArray(got)
+		expectedString := dumpArray(test.expected)
+		if gotString != expectedString {
+			t.Errorf("expected:\n%s\ngot:\n%s", expectedString, gotString)
+		}
+	}
+}
+
+func dumpArray(a []*MakeString) string {
+	ret := make([]string, len(a))
+
+	for i, s := range a {
+		ret[i] = s.Dump()
+	}
+
+	return strings.Join(ret, "|||")
+}