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| Original file line number | Diff line number | Diff line change |
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| objx - by Mat Ryer and Tyler Bunnell | ||
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| The MIT License (MIT) | ||
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| Copyright (c) 2014 Stretchr, Inc. | ||
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| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
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| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
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| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. |
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| # objx | ||
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| * Jump into the [API Documentation](http://godoc.org/github.com/stretchr/objx) |
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| package objx | ||
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| import ( | ||
| "fmt" | ||
| "regexp" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
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| // arrayAccesRegexString is the regex used to extract the array number | ||
| // from the access path | ||
| const arrayAccesRegexString = `^(.+)\[([0-9]+)\]$` | ||
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| // arrayAccesRegex is the compiled arrayAccesRegexString | ||
| var arrayAccesRegex = regexp.MustCompile(arrayAccesRegexString) | ||
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| // Get gets the value using the specified selector and | ||
| // returns it inside a new Obj object. | ||
| // | ||
| // If it cannot find the value, Get will return a nil | ||
| // value inside an instance of Obj. | ||
| // | ||
| // Get can only operate directly on map[string]interface{} and []interface. | ||
| // | ||
| // Example | ||
| // | ||
| // To access the title of the third chapter of the second book, do: | ||
| // | ||
| // o.Get("books[1].chapters[2].title") | ||
| func (m Map) Get(selector string) *Value { | ||
| rawObj := access(m, selector, nil, false, false) | ||
| return &Value{data: rawObj} | ||
| } | ||
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| // Set sets the value using the specified selector and | ||
| // returns the object on which Set was called. | ||
| // | ||
| // Set can only operate directly on map[string]interface{} and []interface | ||
| // | ||
| // Example | ||
| // | ||
| // To set the title of the third chapter of the second book, do: | ||
| // | ||
| // o.Set("books[1].chapters[2].title","Time to Go") | ||
| func (m Map) Set(selector string, value interface{}) Map { | ||
| access(m, selector, value, true, false) | ||
| return m | ||
| } | ||
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| // access accesses the object using the selector and performs the | ||
| // appropriate action. | ||
| func access(current, selector, value interface{}, isSet, panics bool) interface{} { | ||
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| switch selector.(type) { | ||
| case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64: | ||
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| if array, ok := current.([]interface{}); ok { | ||
| index := intFromInterface(selector) | ||
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| if index >= len(array) { | ||
| if panics { | ||
| panic(fmt.Sprintf("objx: Index %d is out of range. Slice only contains %d items.", index, len(array))) | ||
| } | ||
| return nil | ||
| } | ||
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| return array[index] | ||
| } | ||
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| return nil | ||
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| case string: | ||
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| selStr := selector.(string) | ||
| selSegs := strings.SplitN(selStr, PathSeparator, 2) | ||
| thisSel := selSegs[0] | ||
| index := -1 | ||
| var err error | ||
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| // https://github.com/stretchr/objx/issues/12 | ||
| if strings.Contains(thisSel, "[") { | ||
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| arrayMatches := arrayAccesRegex.FindStringSubmatch(thisSel) | ||
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| if len(arrayMatches) > 0 { | ||
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| // Get the key into the map | ||
| thisSel = arrayMatches[1] | ||
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| // Get the index into the array at the key | ||
| index, err = strconv.Atoi(arrayMatches[2]) | ||
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| if err != nil { | ||
| // This should never happen. If it does, something has gone | ||
| // seriously wrong. Panic. | ||
| panic("objx: Array index is not an integer. Must use array[int].") | ||
| } | ||
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| } | ||
| } | ||
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| if curMap, ok := current.(Map); ok { | ||
| current = map[string]interface{}(curMap) | ||
| } | ||
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| // get the object in question | ||
| switch current.(type) { | ||
| case map[string]interface{}: | ||
| curMSI := current.(map[string]interface{}) | ||
| if len(selSegs) <= 1 && isSet { | ||
| curMSI[thisSel] = value | ||
| return nil | ||
| } else { | ||
| current = curMSI[thisSel] | ||
| } | ||
| default: | ||
| current = nil | ||
| } | ||
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| if current == nil && panics { | ||
| panic(fmt.Sprintf("objx: '%v' invalid on object.", selector)) | ||
| } | ||
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| // do we need to access the item of an array? | ||
| if index > -1 { | ||
| if array, ok := current.([]interface{}); ok { | ||
| if index < len(array) { | ||
| current = array[index] | ||
| } else { | ||
| if panics { | ||
| panic(fmt.Sprintf("objx: Index %d is out of range. Slice only contains %d items.", index, len(array))) | ||
| } | ||
| current = nil | ||
| } | ||
| } | ||
| } | ||
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| if len(selSegs) > 1 { | ||
| current = access(current, selSegs[1], value, isSet, panics) | ||
| } | ||
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| } | ||
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| return current | ||
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| } | ||
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| // intFromInterface converts an interface object to the largest | ||
| // representation of an unsigned integer using a type switch and | ||
| // assertions | ||
| func intFromInterface(selector interface{}) int { | ||
| var value int | ||
| switch selector.(type) { | ||
| case int: | ||
| value = selector.(int) | ||
| case int8: | ||
| value = int(selector.(int8)) | ||
| case int16: | ||
| value = int(selector.(int16)) | ||
| case int32: | ||
| value = int(selector.(int32)) | ||
| case int64: | ||
| value = int(selector.(int64)) | ||
| case uint: | ||
| value = int(selector.(uint)) | ||
| case uint8: | ||
| value = int(selector.(uint8)) | ||
| case uint16: | ||
| value = int(selector.(uint16)) | ||
| case uint32: | ||
| value = int(selector.(uint32)) | ||
| case uint64: | ||
| value = int(selector.(uint64)) | ||
| default: | ||
| panic("objx: array access argument is not an integer type (this should never happen)") | ||
| } | ||
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| return value | ||
| } |
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