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‎.gitignore‎

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.DS_Store
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example/example

‎.travis.yml‎

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language: go
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go:
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- 1.1
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- 1.2.2
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- 1.3.3
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- tip

‎LICENSE‎

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The MIT License (MIT)
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Copyright (c) 2014 Igor Dolzhikov
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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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
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md‎

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Go Tags
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=======
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A tags package for use with Go (golang) services
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[![Build Status](https://travis-ci.org/takama/tags.png?branch=master)](https://travis-ci.org/takama/tags)
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[![GoDoc](https://godoc.org/github.com/takama/tags?status.svg)](https://godoc.org/github.com/takama/tags)
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### Definitions
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"Tags" - a strings which used for tag any object
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"non-strict Tags" - a strings which match to strings in data ("new" -> "new")
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"strict Tags" - all strict tags have prefix "+" for strict match ("+new")
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and "-" for strict mismatch ("-old")
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All strict Tags applied with logical operator "AND" between each other
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All non-strict Tags applied with logical operator "OR" between all tags
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### Example
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```go
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package main
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import (
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"fmt"
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"github.com/takama/tags"
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)
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// Product is struct with tags
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type Product struct {
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Name string
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Description string
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Tags tags.Tags
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}
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func main() {
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product := Product{
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Name: "the tee",
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Description: "the boutle of ice black tee with sugar",
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Tags: tags.Tags{"ice", "black", "sugar"},
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}
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fmt.Println("Product:", product.Description)
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fmt.Println("Is this tee black or green?")
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query := tags.Tags{"black", "green"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is black.")
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} else {
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fmt.Println("No, the tee has not black or green options.")
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}
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fmt.Println("Is this tee green with sugar?")
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query = tags.Tags{"+green", "+sugar"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is green with sugar.")
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} else {
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fmt.Println("No, the tee with sugar, but is not green.")
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}
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fmt.Println("Is this tee hot?")
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query = tags.Tags{"-ice"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is hot.")
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} else {
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fmt.Println("No, it is ice tee.")
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}
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}
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```
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## Author
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[Igor Dolzhikov](https://github.com/takama)
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## Contributors
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All the contributors are welcome. If you would like to be the contributor please accept some rules.
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- The pull requests will be accepted only in "develop" branch
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- All modifications or additions should be tested
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- Sorry, I'll not accept code with any dependency, only standard library
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Thank you for your understanding!
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## License
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[MIT Public License](https://github.com/takama/tags/blob/master/LICENSE)

‎example/example.go‎

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package main
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import (
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"fmt"
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"github.com/takama/tags"
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)
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// Product is struct with tags
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type Product struct {
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Name string
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Description string
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Tags tags.Tags
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}
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func main() {
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product := Product{
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Name: "the tee",
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Description: "the boutle of ice black tee with sugar",
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Tags: tags.Tags{"ice", "black", "sugar"},
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}
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fmt.Println("Product:", product.Description)
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fmt.Println("Is this tee black or green?")
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query := tags.Tags{"black", "green"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is black.")
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} else {
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fmt.Println("No, the tee has not black or green options.")
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}
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fmt.Println("Is this tee green with sugar?")
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query = tags.Tags{"+green", "+sugar"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is green with sugar.")
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} else {
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fmt.Println("No, the tee with sugar, but is not green.")
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}
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fmt.Println("Is this tee hot?")
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query = tags.Tags{"-ice"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is hot.")
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} else {
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fmt.Println("No, it is ice tee.")
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}
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}

‎tags.go‎

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// Copyright 2014 Igor Dolzhikov. All rights reserved.
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// Use of this source code is governed by a license
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// that can be found in the LICENSE file.
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/*
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Package tags 0.1.0
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Definition:
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"Tags" - a strings which used for tag any object
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"non-strict Tags" - a strings which match to strings in data ("new" -> "new")
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"strict Tags" - all strict tags have prefix "+" for strict match ("+new")
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and "-" for strict mismatch ("-old")
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All strict Tags applied with logical operator "AND" between each other
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All non-strict Tags applied with logical operator "OR" between all tags
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Example:
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package main
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import (
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"fmt"
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"github.com/takama/tags"
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)
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// Product is struct with tags
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type Product struct {
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Name string
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Description string
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Tags tags.Tags
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}
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func main() {
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product := Product{
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Name: "the tee",
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Description: "the boutle of ice black tee with sugar",
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Tags: tags.Tags{"ice", "black", "sugar"},
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}
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fmt.Println("Product:", product.Description)
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fmt.Println("Is this tee black or green?")
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query := tags.Tags{"black", "green"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is black.")
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} else {
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fmt.Println("No, the tee has not black or green options.")
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}
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fmt.Println("Is this tee green with sugar?")
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query = tags.Tags{"+green", "+sugar"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is green with sugar.")
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} else {
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fmt.Println("No, the tee with sugar, but is not green.")
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}
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fmt.Println("Is this tee hot?")
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query = tags.Tags{"-ice"}
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if product.Tags.IsTagged(query) {
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fmt.Println("Yes, the tee is hot.")
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} else {
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fmt.Println("No, it is ice tee.")
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}
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}
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Go Tags
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*/
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package tags
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import (
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"strings"
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)
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// Tags a slice of strings which used for tag any object
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type Tags []string
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// IsTagged method checks if elements in a data compliant for tags in query
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func (t Tags) IsTagged(query Tags) bool {
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if len(query) == 0 {
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return true
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}
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if len(t) == 0 {
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return false
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}
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for _, qTag := range query {
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for _, tag := range t {
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if tag == qTag {
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return true
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}
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}
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}
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var strict uint8
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for _, qTag := range query {
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if strings.HasPrefix(qTag, "+") || strings.HasPrefix(qTag, "-") {
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strict++
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}
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}
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if strict == 0 {
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return false
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}
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for _, qTag := range query {
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if strings.HasPrefix(qTag, "+") {
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for _, tag := range t {
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if tag == strings.TrimPrefix(qTag, "+") {
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strict--
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break
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}
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}
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}
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if strings.HasPrefix(qTag, "-") {
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fit := true
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for _, tag := range t {
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if tag == strings.TrimPrefix(qTag, "-") {
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fit = false
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break
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}
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}
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if fit {
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strict--
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}
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}
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}
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return strict == 0
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}

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