android/rule_builder_test.go

// Copyright 2019 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package android

import (
	"fmt"
	"path/filepath"
	"reflect"
	"regexp"
	"strings"
	"testing"

	"github.com/google/blueprint"

	"android/soong/shared"
)

func pathContext() PathContext {
	return PathContextForTesting(TestConfig("out", nil, "", map[string][]byte{
		"ld":      nil,
		"a.o":     nil,
		"b.o":     nil,
		"cp":      nil,
		"a":       nil,
		"b":       nil,
		"ls":      nil,
		"ln":      nil,
		"turbine": nil,
		"java":    nil,
		"javac":   nil,
	}))
}

func ExampleRuleBuilder() {
	rule := NewRuleBuilder()

	ctx := pathContext()

	rule.Command().
		Tool(PathForSource(ctx, "ld")).
		Inputs(PathsForTesting("a.o", "b.o")).
		FlagWithOutput("-o ", PathForOutput(ctx, "linked"))
	rule.Command().Text("echo success")

	// To add the command to the build graph:
	// rule.Build(pctx, ctx, "link", "link")

	fmt.Printf("commands: %q\n", strings.Join(rule.Commands(), " && "))
	fmt.Printf("tools: %q\n", rule.Tools())
	fmt.Printf("inputs: %q\n", rule.Inputs())
	fmt.Printf("outputs: %q\n", rule.Outputs())

	// Output:
	// commands: "ld a.o b.o -o out/linked && echo success"
	// tools: ["ld"]
	// inputs: ["a.o" "b.o"]
	// outputs: ["out/linked"]
}

func ExampleRuleBuilder_SymlinkOutputs() {
	rule := NewRuleBuilder()

	ctx := pathContext()

	rule.Command().
		Tool(PathForSource(ctx, "ln")).
		FlagWithInput("-s ", PathForTesting("a.o")).
		SymlinkOutput(PathForOutput(ctx, "a"))
	rule.Command().Text("cp out/a out/b").
		ImplicitSymlinkOutput(PathForOutput(ctx, "b"))

	fmt.Printf("commands: %q\n", strings.Join(rule.Commands(), " && "))
	fmt.Printf("tools: %q\n", rule.Tools())
	fmt.Printf("inputs: %q\n", rule.Inputs())
	fmt.Printf("outputs: %q\n", rule.Outputs())
	fmt.Printf("symlink_outputs: %q\n", rule.SymlinkOutputs())

	// Output:
	// commands: "ln -s a.o out/a && cp out/a out/b"
	// tools: ["ln"]
	// inputs: ["a.o"]
	// outputs: ["out/a" "out/b"]
	// symlink_outputs: ["out/a" "out/b"]
}

func ExampleRuleBuilder_Temporary() {
	rule := NewRuleBuilder()

	ctx := pathContext()

	rule.Command().
		Tool(PathForSource(ctx, "cp")).
		Input(PathForSource(ctx, "a")).
		Output(PathForOutput(ctx, "b"))
	rule.Command().
		Tool(PathForSource(ctx, "cp")).
		Input(PathForOutput(ctx, "b")).
		Output(PathForOutput(ctx, "c"))
	rule.Temporary(PathForOutput(ctx, "b"))

	fmt.Printf("commands: %q\n", strings.Join(rule.Commands(), " && "))
	fmt.Printf("tools: %q\n", rule.Tools())
	fmt.Printf("inputs: %q\n", rule.Inputs())
	fmt.Printf("outputs: %q\n", rule.Outputs())

	// Output:
	// commands: "cp a out/b && cp out/b out/c"
	// tools: ["cp"]
	// inputs: ["a"]
	// outputs: ["out/c"]
}

func ExampleRuleBuilder_DeleteTemporaryFiles() {
	rule := NewRuleBuilder()

	ctx := pathContext()

	rule.Command().
		Tool(PathForSource(ctx, "cp")).
		Input(PathForSource(ctx, "a")).
		Output(PathForOutput(ctx, "b"))
	rule.Command().
		Tool(PathForSource(ctx, "cp")).
		Input(PathForOutput(ctx, "b")).
		Output(PathForOutput(ctx, "c"))
	rule.Temporary(PathForOutput(ctx, "b"))
	rule.DeleteTemporaryFiles()

	fmt.Printf("commands: %q\n", strings.Join(rule.Commands(), " && "))
	fmt.Printf("tools: %q\n", rule.Tools())
	fmt.Printf("inputs: %q\n", rule.Inputs())
	fmt.Printf("outputs: %q\n", rule.Outputs())

	// Output:
	// commands: "cp a out/b && cp out/b out/c && rm -f out/b"
	// tools: ["cp"]
	// inputs: ["a"]
	// outputs: ["out/c"]
}

func ExampleRuleBuilder_Installs() {
	rule := NewRuleBuilder()

	ctx := pathContext()

	out := PathForOutput(ctx, "linked")

	rule.Command().
		Tool(PathForSource(ctx, "ld")).
		Inputs(PathsForTesting("a.o", "b.o")).
		FlagWithOutput("-o ", out)
	rule.Install(out, "/bin/linked")
	rule.Install(out, "/sbin/linked")

	fmt.Printf("rule.Installs().String() = %q\n", rule.Installs().String())

	// Output:
	// rule.Installs().String() = "out/linked:/bin/linked out/linked:/sbin/linked"
}

func ExampleRuleBuilderCommand() {
	rule := NewRuleBuilder()

	ctx := pathContext()

	// chained
	rule.Command().
		Tool(PathForSource(ctx, "ld")).
		Inputs(PathsForTesting("a.o", "b.o")).
		FlagWithOutput("-o ", PathForOutput(ctx, "linked"))

	// unchained
	cmd := rule.Command()
	cmd.Tool(PathForSource(ctx, "ld"))
	cmd.Inputs(PathsForTesting("a.o", "b.o"))
	cmd.FlagWithOutput("-o ", PathForOutput(ctx, "linked"))

	// mixed:
	cmd = rule.Command().Tool(PathForSource(ctx, "ld"))
	cmd.Inputs(PathsForTesting("a.o", "b.o"))
	cmd.FlagWithOutput("-o ", PathForOutput(ctx, "linked"))
}

func ExampleRuleBuilderCommand_Flag() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "ls")).Flag("-l"))
	// Output:
	// ls -l
}

func ExampleRuleBuilderCommand_Flags() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "ls")).Flags([]string{"-l", "-a"}))
	// Output:
	// ls -l -a
}

func ExampleRuleBuilderCommand_FlagWithArg() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "ls")).
		FlagWithArg("--sort=", "time"))
	// Output:
	// ls --sort=time
}

func ExampleRuleBuilderCommand_FlagForEachArg() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "ls")).
		FlagForEachArg("--sort=", []string{"time", "size"}))
	// Output:
	// ls --sort=time --sort=size
}

func ExampleRuleBuilderCommand_FlagForEachInput() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "turbine")).
		FlagForEachInput("--classpath ", PathsForTesting("a.jar", "b.jar")))
	// Output:
	// turbine --classpath a.jar --classpath b.jar
}

func ExampleRuleBuilderCommand_FlagWithInputList() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "java")).
		FlagWithInputList("-classpath=", PathsForTesting("a.jar", "b.jar"), ":"))
	// Output:
	// java -classpath=a.jar:b.jar
}

func ExampleRuleBuilderCommand_FlagWithInput() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "java")).
		FlagWithInput("-classpath=", PathForSource(ctx, "a")))
	// Output:
	// java -classpath=a
}

func ExampleRuleBuilderCommand_FlagWithList() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "ls")).
		FlagWithList("--sort=", []string{"time", "size"}, ","))
	// Output:
	// ls --sort=time,size
}

func ExampleRuleBuilderCommand_FlagWithRspFileInputList() {
	ctx := pathContext()
	fmt.Println(NewRuleBuilder().Command().
		Tool(PathForSource(ctx, "javac")).
		FlagWithRspFileInputList("@", PathsForTesting("a.java", "b.java")).
		NinjaEscapedString())
	// Output:
	// javac @$out.rsp
}

func ExampleRuleBuilderCommand_String() {
	fmt.Println(NewRuleBuilder().Command().
		Text("FOO=foo").
		Text("echo $FOO").
		String())
	// Output:
	// FOO=foo echo $FOO
}

func ExampleRuleBuilderCommand_NinjaEscapedString() {
	fmt.Println(NewRuleBuilder().Command().
		Text("FOO=foo").
		Text("echo $FOO").
		NinjaEscapedString())
	// Output:
	// FOO=foo echo $$FOO
}

func TestRuleBuilder(t *testing.T) {
	fs := map[string][]byte{
		"dep_fixer":  nil,
		"input":      nil,
		"Implicit":   nil,
		"Input":      nil,
		"OrderOnly":  nil,
		"OrderOnlys": nil,
		"Tool":       nil,
		"input2":     nil,
		"tool2":      nil,
		"input3":     nil,
	}

	ctx := PathContextForTesting(TestConfig("out", nil, "", fs))

	addCommands := func(rule *RuleBuilder) {
		cmd := rule.Command().
			DepFile(PathForOutput(ctx, "DepFile")).
			Flag("Flag").
			FlagWithArg("FlagWithArg=", "arg").
			FlagWithDepFile("FlagWithDepFile=", PathForOutput(ctx, "depfile")).
			FlagWithInput("FlagWithInput=", PathForSource(ctx, "input")).
			FlagWithOutput("FlagWithOutput=", PathForOutput(ctx, "output")).
			Implicit(PathForSource(ctx, "Implicit")).
			ImplicitDepFile(PathForOutput(ctx, "ImplicitDepFile")).
			ImplicitOutput(PathForOutput(ctx, "ImplicitOutput")).
			Input(PathForSource(ctx, "Input")).
			Output(PathForOutput(ctx, "Output")).
			OrderOnly(PathForSource(ctx, "OrderOnly")).
			SymlinkOutput(PathForOutput(ctx, "SymlinkOutput")).
			ImplicitSymlinkOutput(PathForOutput(ctx, "ImplicitSymlinkOutput")).
			Text("Text").
			Tool(PathForSource(ctx, "Tool"))

		rule.Command().
			Text("command2").
			DepFile(PathForOutput(ctx, "depfile2")).
			Input(PathForSource(ctx, "input2")).
			Output(PathForOutput(ctx, "output2")).
			OrderOnlys(PathsForSource(ctx, []string{"OrderOnlys"})).
			Tool(PathForSource(ctx, "tool2"))

		// Test updates to the first command after the second command has been started
		cmd.Text("after command2")
		// Test updating a command when the previous update did not replace the cmd variable
		cmd.Text("old cmd")

		// Test a command that uses the output of a previous command as an input
		rule.Command().
			Text("command3").
			Input(PathForSource(ctx, "input3")).
			Input(PathForOutput(ctx, "output2")).
			Output(PathForOutput(ctx, "output3"))
	}

	wantInputs := PathsForSource(ctx, []string{"Implicit", "Input", "input", "input2", "input3"})
	wantOutputs := PathsForOutput(ctx, []string{"ImplicitOutput", "ImplicitSymlinkOutput", "Output", "SymlinkOutput", "output", "output2", "output3"})
	wantDepFiles := PathsForOutput(ctx, []string{"DepFile", "depfile", "ImplicitDepFile", "depfile2"})
	wantTools := PathsForSource(ctx, []string{"Tool", "tool2"})
	wantOrderOnlys := PathsForSource(ctx, []string{"OrderOnly", "OrderOnlys"})
	wantSymlinkOutputs := PathsForOutput(ctx, []string{"ImplicitSymlinkOutput", "SymlinkOutput"})

	t.Run("normal", func(t *testing.T) {
		rule := NewRuleBuilder()
		addCommands(rule)

		wantCommands := []string{
			"out/DepFile Flag FlagWithArg=arg FlagWithDepFile=out/depfile FlagWithInput=input FlagWithOutput=out/output Input out/Output out/SymlinkOutput Text Tool after command2 old cmd",
			"command2 out/depfile2 input2 out/output2 tool2",
			"command3 input3 out/output2 out/output3",
		}

		wantDepMergerCommand := "out/host/" + ctx.Config().PrebuiltOS() + "/bin/dep_fixer out/DepFile out/depfile out/ImplicitDepFile out/depfile2"

		if g, w := rule.Commands(), wantCommands; !reflect.DeepEqual(g, w) {
			t.Errorf("\nwant rule.Commands() = %#v\n                   got %#v", w, g)
		}

		if g, w := rule.Inputs(), wantInputs; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.Inputs() = %#v\n                 got %#v", w, g)
		}
		if g, w := rule.Outputs(), wantOutputs; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.Outputs() = %#v\n                  got %#v", w, g)
		}
		if g, w := rule.SymlinkOutputs(), wantSymlinkOutputs; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.SymlinkOutputs() = %#v\n                  got %#v", w, g)
		}
		if g, w := rule.DepFiles(), wantDepFiles; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.DepFiles() = %#v\n                  got %#v", w, g)
		}
		if g, w := rule.Tools(), wantTools; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.Tools() = %#v\n                got %#v", w, g)
		}
		if g, w := rule.OrderOnlys(), wantOrderOnlys; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.OrderOnlys() = %#v\n                got %#v", w, g)
		}

		if g, w := rule.depFileMergerCmd(ctx, rule.DepFiles()).String(), wantDepMergerCommand; g != w {
			t.Errorf("\nwant rule.depFileMergerCmd() = %#v\n                   got %#v", w, g)
		}
	})

	t.Run("sbox", func(t *testing.T) {
		rule := NewRuleBuilder().Sbox(PathForOutput(ctx, ""),
			PathForOutput(ctx, "sbox.textproto"))
		addCommands(rule)

		wantCommands := []string{
			"__SBOX_SANDBOX_DIR__/out/DepFile Flag FlagWithArg=arg FlagWithDepFile=__SBOX_SANDBOX_DIR__/out/depfile FlagWithInput=input FlagWithOutput=__SBOX_SANDBOX_DIR__/out/output Input __SBOX_SANDBOX_DIR__/out/Output __SBOX_SANDBOX_DIR__/out/SymlinkOutput Text Tool after command2 old cmd",
			"command2 __SBOX_SANDBOX_DIR__/out/depfile2 input2 __SBOX_SANDBOX_DIR__/out/output2 tool2",
			"command3 input3 __SBOX_SANDBOX_DIR__/out/output2 __SBOX_SANDBOX_DIR__/out/output3",
		}

		wantDepMergerCommand := "out/host/" + ctx.Config().PrebuiltOS() + "/bin/dep_fixer __SBOX_SANDBOX_DIR__/out/DepFile __SBOX_SANDBOX_DIR__/out/depfile __SBOX_SANDBOX_DIR__/out/ImplicitDepFile __SBOX_SANDBOX_DIR__/out/depfile2"

		if g, w := rule.Commands(), wantCommands; !reflect.DeepEqual(g, w) {
			t.Errorf("\nwant rule.Commands() = %#v\n                   got %#v", w, g)
		}

		if g, w := rule.Inputs(), wantInputs; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.Inputs() = %#v\n                 got %#v", w, g)
		}
		if g, w := rule.Outputs(), wantOutputs; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.Outputs() = %#v\n                  got %#v", w, g)
		}
		if g, w := rule.DepFiles(), wantDepFiles; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.DepFiles() = %#v\n                  got %#v", w, g)
		}
		if g, w := rule.Tools(), wantTools; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.Tools() = %#v\n                got %#v", w, g)
		}
		if g, w := rule.OrderOnlys(), wantOrderOnlys; !reflect.DeepEqual(w, g) {
			t.Errorf("\nwant rule.OrderOnlys() = %#v\n                got %#v", w, g)
		}

		if g, w := rule.depFileMergerCmd(ctx, rule.DepFiles()).String(), wantDepMergerCommand; g != w {
			t.Errorf("\nwant rule.depFileMergerCmd() = %#v\n                   got %#v", w, g)
		}
	})
}

func testRuleBuilderFactory() Module {
	module := &testRuleBuilderModule{}
	module.AddProperties(&module.properties)
	InitAndroidModule(module)
	return module
}

type testRuleBuilderModule struct {
	ModuleBase
	properties struct {
		Srcs []string

		Restat bool
		Sbox   bool
	}
}

func (t *testRuleBuilderModule) GenerateAndroidBuildActions(ctx ModuleContext) {
	in := PathsForSource(ctx, t.properties.Srcs)
	out := PathForModuleOut(ctx, "gen", ctx.ModuleName())
	outDep := PathForModuleOut(ctx, "gen", ctx.ModuleName()+".d")
	outDir := PathForModuleOut(ctx, "gen")
	manifestPath := PathForModuleOut(ctx, "sbox.textproto")

	testRuleBuilder_Build(ctx, in, out, outDep, outDir, manifestPath, t.properties.Restat, t.properties.Sbox)
}

type testRuleBuilderSingleton struct{}

func testRuleBuilderSingletonFactory() Singleton {
	return &testRuleBuilderSingleton{}
}

func (t *testRuleBuilderSingleton) GenerateBuildActions(ctx SingletonContext) {
	in := PathForSource(ctx, "bar")
	out := PathForOutput(ctx, "singleton/gen/baz")
	outDep := PathForOutput(ctx, "singleton/gen/baz.d")
	outDir := PathForOutput(ctx, "singleton/gen")
	manifestPath := PathForOutput(ctx, "singleton/sbox.textproto")
	testRuleBuilder_Build(ctx, Paths{in}, out, outDep, outDir, manifestPath, true, false)
}

func testRuleBuilder_Build(ctx BuilderContext, in Paths, out, outDep, outDir, manifestPath WritablePath, restat, sbox bool) {
	rule := NewRuleBuilder()

	if sbox {
		rule.Sbox(outDir, manifestPath)
	}

	rule.Command().Tool(PathForSource(ctx, "cp")).Inputs(in).Output(out).ImplicitDepFile(outDep)

	if restat {
		rule.Restat()
	}

	rule.Build(pctx, ctx, "rule", "desc")
}

func TestRuleBuilder_Build(t *testing.T) {
	fs := map[string][]byte{
		"bar": nil,
		"cp":  nil,
	}

	bp := `
		rule_builder_test {
			name: "foo",
			srcs: ["bar"],
			restat: true,
		}
		rule_builder_test {
			name: "foo_sbox",
			srcs: ["bar"],
			sbox: true,
		}
	`

	config := TestConfig(buildDir, nil, bp, fs)
	ctx := NewTestContext(config)
	ctx.RegisterModuleType("rule_builder_test", testRuleBuilderFactory)
	ctx.RegisterSingletonType("rule_builder_test", testRuleBuilderSingletonFactory)
	ctx.Register()

	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
	FailIfErrored(t, errs)
	_, errs = ctx.PrepareBuildActions(config)
	FailIfErrored(t, errs)

	check := func(t *testing.T, params TestingBuildParams, wantCommand, wantOutput, wantDepfile string, wantRestat bool, extraImplicits, extraCmdDeps []string) {
		t.Helper()
		command := params.RuleParams.Command
		re := regexp.MustCompile(" # hash of input list: [a-z0-9]*$")
		command = re.ReplaceAllLiteralString(command, "")
		if command != wantCommand {
			t.Errorf("\nwant RuleParams.Command = %q\n                      got %q", wantCommand, params.RuleParams.Command)
		}

		wantDeps := append([]string{"cp"}, extraCmdDeps...)
		if !reflect.DeepEqual(params.RuleParams.CommandDeps, wantDeps) {
			t.Errorf("\nwant RuleParams.CommandDeps = %q\n                          got %q", wantDeps, params.RuleParams.CommandDeps)
		}

		if params.RuleParams.Restat != wantRestat {
			t.Errorf("want RuleParams.Restat = %v, got %v", wantRestat, params.RuleParams.Restat)
		}

		wantImplicits := append([]string{"bar"}, extraImplicits...)
		if !reflect.DeepEqual(params.Implicits.Strings(), wantImplicits) {
			t.Errorf("want Implicits = [%q], got %q", "bar", params.Implicits.Strings())
		}

		if params.Output.String() != wantOutput {
			t.Errorf("want Output = %q, got %q", wantOutput, params.Output)
		}

		if len(params.ImplicitOutputs) != 0 {
			t.Errorf("want ImplicitOutputs = [], got %q", params.ImplicitOutputs.Strings())
		}

		if params.Depfile.String() != wantDepfile {
			t.Errorf("want Depfile = %q, got %q", wantDepfile, params.Depfile)
		}

		if params.Deps != blueprint.DepsGCC {
			t.Errorf("want Deps = %q, got %q", blueprint.DepsGCC, params.Deps)
		}
	}

	t.Run("module", func(t *testing.T) {
		outFile := filepath.Join(buildDir, ".intermediates", "foo", "gen", "foo")
		check(t, ctx.ModuleForTests("foo", "").Rule("rule"),
			"cp bar "+outFile,
			outFile, outFile+".d", true, nil, nil)
	})
	t.Run("sbox", func(t *testing.T) {
		outDir := filepath.Join(buildDir, ".intermediates", "foo_sbox")
		outFile := filepath.Join(outDir, "gen/foo_sbox")
		depFile := filepath.Join(outDir, "gen/foo_sbox.d")
		manifest := filepath.Join(outDir, "sbox.textproto")
		sbox := filepath.Join(buildDir, "host", config.PrebuiltOS(), "bin/sbox")
		sandboxPath := shared.TempDirForOutDir(buildDir)

		cmd := `rm -rf ` + outDir + `/gen && ` +
			sbox + ` --sandbox-path ` + sandboxPath + ` --manifest ` + manifest

		check(t, ctx.ModuleForTests("foo_sbox", "").Output("gen/foo_sbox"),
			cmd, outFile, depFile, false, []string{manifest}, []string{sbox})
	})
	t.Run("singleton", func(t *testing.T) {
		outFile := filepath.Join(buildDir, "singleton/gen/baz")
		check(t, ctx.SingletonForTests("rule_builder_test").Rule("rule"),
			"cp bar "+outFile, outFile, outFile+".d", true, nil, nil)
	})
}

func Test_ninjaEscapeExceptForSpans(t *testing.T) {
	type args struct {
		s     string
		spans [][2]int
	}
	tests := []struct {
		name string
		args args
		want string
	}{
		{
			name: "empty",
			args: args{
				s: "",
			},
			want: "",
		},
		{
			name: "unescape none",
			args: args{
				s: "$abc",
			},
			want: "$$abc",
		},
		{
			name: "unescape all",
			args: args{
				s:     "$abc",
				spans: [][2]int{{0, 4}},
			},
			want: "$abc",
		},
		{
			name: "unescape first",
			args: args{
				s:     "$abc$",
				spans: [][2]int{{0, 1}},
			},
			want: "$abc$$",
		},
		{
			name: "unescape last",
			args: args{
				s:     "$abc$",
				spans: [][2]int{{4, 5}},
			},
			want: "$$abc$",
		},
		{
			name: "unescape middle",
			args: args{
				s:     "$a$b$c$",
				spans: [][2]int{{2, 5}},
			},
			want: "$$a$b$c$$",
		},
		{
			name: "unescape multiple",
			args: args{
				s:     "$a$b$c$",
				spans: [][2]int{{2, 3}, {4, 5}},
			},
			want: "$$a$b$c$$",
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := ninjaEscapeExceptForSpans(tt.args.s, tt.args.spans); got != tt.want {
				t.Errorf("ninjaEscapeExceptForSpans() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestRuleBuilderHashInputs(t *testing.T) {
	// The basic idea here is to verify that the command (in the case of a
	// non-sbox rule) or the sbox textproto manifest contain a hash of the
	// inputs.

	// By including a hash of the inputs, we cause the rule to re-run if
	// the list of inputs changes because the command line or a dependency
	// changes.

	bp := `
			rule_builder_test {
				name: "hash0",
				srcs: ["in1.txt", "in2.txt"],
			}
			rule_builder_test {
				name: "hash0_sbox",
				srcs: ["in1.txt", "in2.txt"],
				sbox: true,
			}
			rule_builder_test {
				name: "hash1",
				srcs: ["in1.txt", "in2.txt", "in3.txt"],
			}
			rule_builder_test {
				name: "hash1_sbox",
				srcs: ["in1.txt", "in2.txt", "in3.txt"],
				sbox: true,
			}
		`
	testcases := []struct {
		name         string
		expectedHash string
	}{
		{
			name: "hash0",
			// sha256 value obtained from: echo -en 'in1.txt\nin2.txt' | sha256sum
			expectedHash: "18da75b9b1cc74b09e365b4ca2e321b5d618f438cc632b387ad9dc2ab4b20e9d",
		},
		{
			name: "hash1",
			// sha256 value obtained from: echo -en 'in1.txt\nin2.txt\nin3.txt' | sha256sum
			expectedHash: "a38d432a4b19df93140e1f1fe26c97ff0387dae01fe506412b47208f0595fb45",
		},
	}

	config := TestConfig(buildDir, nil, bp, nil)
	ctx := NewTestContext(config)
	ctx.RegisterModuleType("rule_builder_test", testRuleBuilderFactory)
	ctx.Register()

	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
	FailIfErrored(t, errs)
	_, errs = ctx.PrepareBuildActions(config)
	FailIfErrored(t, errs)

	for _, test := range testcases {
		t.Run(test.name, func(t *testing.T) {
			t.Run("sbox", func(t *testing.T) {
				gen := ctx.ModuleForTests(test.name+"_sbox", "")
				manifest := RuleBuilderSboxProtoForTests(t, gen.Output("sbox.textproto"))
				hash := manifest.Commands[0].GetInputHash()

				if g, w := hash, test.expectedHash; g != w {
					t.Errorf("Expected has %q, got %q", w, g)
				}
			})
			t.Run("", func(t *testing.T) {
				gen := ctx.ModuleForTests(test.name+"", "")
				command := gen.Output("gen/" + test.name).RuleParams.Command
				if g, w := command, " # hash of input list: "+test.expectedHash; !strings.HasSuffix(g, w) {
					t.Errorf("Expected command line to end with %q, got %q", w, g)
				}
			})
		})
	}
}