1// Copyright 2020 Google Inc. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package soongconfig
16
17import (
18	"fmt"
19	"strings"
20)
21
22type SoongConfig interface {
23	// Bool interprets the variable named `name` as a boolean, returning true if, after
24	// lowercasing, it matches one of "1", "y", "yes", "on", or "true". Unset, or any other
25	// value will return false.
26	Bool(name string) bool
27
28	// String returns the string value of `name`. If the variable was not set, it will
29	// return the empty string.
30	String(name string) string
31
32	// IsSet returns whether the variable `name` was set by Make.
33	IsSet(name string) bool
34}
35
36func Config(vars map[string]string) SoongConfig {
37	configVars := make(map[string]string)
38	if len(vars) > 0 {
39		for k, v := range vars {
40			configVars[k] = v
41		}
42		if _, exists := configVars[conditionsDefault]; exists {
43			panic(fmt.Sprintf("%q is a reserved soong config variable name", conditionsDefault))
44		}
45	}
46	return soongConfig(configVars)
47}
48
49type soongConfig map[string]string
50
51func (c soongConfig) Bool(name string) bool {
52	v := strings.ToLower(c[name])
53	return v == "1" || v == "y" || v == "yes" || v == "on" || v == "true"
54}
55
56func (c soongConfig) String(name string) string {
57	return c[name]
58}
59
60func (c soongConfig) IsSet(name string) bool {
61	_, ok := c[name]
62	return ok
63}
64