add go module support, simplify things, and now if ranks is empty not return an error

Author: didasy

go.mod

@@ -0,0 +1,7 @@
+module github.com/JesusIslam/tldr
+
+require (
+	github.com/alixaxel/pagerank v0.0.0-20160306110729-14bfb4c1d88c
+	github.com/onsi/ginkgo v1.7.0
+	github.com/onsi/gomega v1.4.3
+)

go.sum

@@ -0,0 +1,25 @@
+github.com/alixaxel/pagerank v0.0.0-20160306110729-14bfb4c1d88c h1:UUHM6/UM34ESICar/DWOhLt2rqYabsvfjmupiY9z+iE=
+github.com/alixaxel/pagerank v0.0.0-20160306110729-14bfb4c1d88c/go.mod h1:e7Vic/xXDZAQ8ftWoLnVrXseAAvt54SVYrcirjCKcX0=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
+github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
+github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd h1:nTDtHvHSdCn1m6ITfMRqtOd/9+7a3s8RBNOZ3eYZzJA=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e h1:o3PsSEY8E4eXWkXrIP9YJALUkVZqzHJT5DOasTyn8Vs=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

tldr.go

@@ -7,7 +7,7 @@ WARNING: This package is not thread safe, so you cannot use *Bag from many gorou
 package tldr
 
 import (
-	"errors"
+	"encoding/json"
 	"sort"
 	"strings"
 	"unicode"
@@ -38,9 +38,14 @@ type Bag struct {
 	vectorLength int
 }
 
+func (b *Bag) String() string {
+	r, _ := json.MarshalIndent(b, "", "  ")
+	return string(r)
+}
+
 // The default values of each settings
 const (
-	VERSION                              = "0.5.0"
+	VERSION                              = "0.6.0"
 	DEFAULT_ALGORITHM                    = "pagerank"
 	DEFAULT_WEIGHING                     = "hamming"
 	DEFAULT_DAMPING                      = 0.85
@@ -55,7 +60,6 @@ func defaultWordTokenizer(sentence string) []string {
 	for i, word := range words {
 		words[i] = SanitizeWord(word)
 	}
-
 	return words
 }
 
@@ -125,21 +129,18 @@ func (bag *Bag) Summarize(text string, num int) ([]string, error) {
 	switch bag.Algorithm {
 	case "centrality":
 		bag.centrality()
-		break
 	case "pagerank":
 		bag.pageRank()
-		break
 	case "custom":
 		bag.Ranks = bag.customAlgorithm(bag.Edges)
-		break
 	default:
 		bag.pageRank()
 	}
 
 	// if no ranks, return error
 	lenRanks := len(bag.Ranks)
 	if lenRanks == 0 {
-		return nil, errors.New("Ranks is empty")
+		return nil, nil
 	}
 
 	// guard so it won't crash but return only the highest rank sentence
@@ -263,14 +264,11 @@ func (bag *Bag) createEdges() {
 				case "jaccard":
 					commonElements := Intersection(src.vector, dst.vector)
 					weight = 1.0 - float64(len(commonElements))/((float64(bag.vectorLength)*2)-float64(len(commonElements)))
-					break
 				case "hamming":
 					differentElements := SymmetricDifference(src.vector, dst.vector)
 					weight = float64(len(differentElements))
-					break
 				case "custom":
 					weight = bag.customWeighing(src.vector, dst.vector)
-					break
 				default:
 					differentElements := SymmetricDifference(src.vector, dst.vector)
 					weight = float64(len(differentElements))

util.go

@@ -155,7 +155,7 @@ func Intersection(src, dst []int) []int {
 		}
 	}
 	var result []int
-	for k, _ := range intersect {
+	for k := range intersect {
 		result = append(result, k)
 	}
 	return result