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yaml_config.go
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yaml_config.go
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//Copyright 2016 lyobzik
//
//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 config
import (
yaml "gopkg.in/yaml.v2"
)
type yamlConfig struct {
data interface{}
}
func newYAMLConfig(data []byte) (Config, error) {
var config yamlConfig
if err := yaml.Unmarshal(data, &config.data); err != nil {
return nil, err
}
return &config, nil
}
// Grabbers.
func (c *yamlConfig) GrabValue(path string, grabber ValueGrabber) (err error) {
element, err := c.findElement(path)
if err != nil {
return err
}
return grabber(element)
}
func (c *yamlConfig) GrabValues(path string, delim string,
creator ValueSliceCreator, grabber ValueGrabber) (err error) {
return c.GrabValue(path, createYAMLValueGrabber(creator, grabber))
}
// Get single value.
func (c *yamlConfig) GetString(path string) (value string, err error) {
return value, c.GrabValue(path, func(data interface{}) error {
value, err = parseYAMLString(data)
return err
})
}
func (c *yamlConfig) GetBool(path string) (value bool, err error) {
return value, c.GrabValue(path, func(data interface{}) error {
value, err = parseYAMLBool(data)
return err
})
}
func (c *yamlConfig) GetFloat(path string) (value float64, err error) {
return value, c.GrabValue(path, func(data interface{}) error {
value, err = parseYAMLFloat(data)
return err
})
}
func (c *yamlConfig) GetInt(path string) (value int64, err error) {
return value, c.GrabValue(path, func(data interface{}) error {
value, err = parseYAMLInt(data)
return err
})
}
// Get array of values.
func (c *yamlConfig) GetStrings(path string, delim string) (value []string, err error) {
return value, c.GrabValues(path, delim,
func(cap int) { value = make([]string, 0, cap) },
func(data interface{}) error {
var parsed string
if parsed, err = parseYAMLString(data); err == nil {
value = append(value, parsed)
}
return err
})
}
func (c *yamlConfig) GetBools(path string, delim string) (value []bool, err error) {
return value, c.GrabValues(path, delim,
func(cap int) { value = make([]bool, 0, cap) },
func(data interface{}) error {
var parsed bool
if parsed, err = parseYAMLBool(data); err == nil {
value = append(value, parsed)
}
return err
})
}
func (c *yamlConfig) GetFloats(path string, delim string) (value []float64, err error) {
return value, c.GrabValues(path, delim,
func(cap int) { value = make([]float64, 0, cap) },
func(data interface{}) error {
var parsed float64
if parsed, err = parseYAMLFloat(data); err == nil {
value = append(value, parsed)
}
return err
})
}
func (c *yamlConfig) GetInts(path string, delim string) (value []int64, err error) {
return value, c.GrabValues(path, delim,
func(cap int) { value = make([]int64, 0, cap) },
func(data interface{}) error {
var parsed int64
if parsed, err = parseYAMLInt(data); err == nil {
value = append(value, parsed)
}
return err
})
}
// Get subconfig.
func (c *yamlConfig) GetConfigPart(path string) (Config, error) {
if len(splitPath(path)) == 0 {
return c, nil
}
element, err := c.findElement(path)
if err != nil {
return nil, err
}
return &yamlConfig{data: element}, nil
}
// Yaml helpers.
func (c *yamlConfig) findElement(path string) (interface{}, error) {
element := c.data
pathParts := splitPath(path)
if len(pathParts) == 0 {
return nil, ErrorNotFound
}
for _, pathPart := range pathParts {
part, converted := element.(map[interface{}]interface{})
if !converted {
return nil, ErrorNotFound
}
var exist bool
if element, exist = part[pathPart]; !exist {
return nil, ErrorNotFound
}
}
return element, nil
}
// Yaml value parsers.
func parseYAMLString(data interface{}) (value string, err error) {
return parseJSONString(data)
}
func parseYAMLBool(data interface{}) (value bool, err error) {
return parseJSONBool(data)
}
func parseYAMLFloat(data interface{}) (value float64, err error) {
return parseJSONFloat(data)
}
func parseYAMLInt(data interface{}) (value int64, err error) {
return parseJSONInt(data)
}
// Grabbing helpers.
func createYAMLValueGrabber(creator ValueSliceCreator, grabber ValueGrabber) ValueGrabber {
return createJSONValueGrabber(creator, grabber)
}