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[INFDEV] Feat: Fuzzy Search #8

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3293320
it is what it is
rajivharlalka Feb 16, 2024
9147fbd
fuzzyyyyy
shikharish Feb 16, 2024
14cded3
credits
shikharish Feb 16, 2024
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3 changes: 3 additions & 0 deletions backend/go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,9 @@ go 1.21.6

require (
github.com/joho/godotenv v1.5.1
github.com/lithammer/fuzzysearch v1.1.8
github.com/mattn/go-sqlite3 v1.14.22
github.com/rs/cors v1.10.1
)

require golang.org/x/text v0.9.0 // indirect
34 changes: 34 additions & 0 deletions backend/go.sum
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Original file line number Diff line number Diff line change
@@ -1,6 +1,40 @@
github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
github.com/lithammer/fuzzysearch v1.1.8 h1:/HIuJnjHuXS8bKaiTMeeDlW2/AyIWk2brx1V8LFgLN4=
github.com/lithammer/fuzzysearch v1.1.8/go.mod h1:IdqeyBClc3FFqSzYq/MXESsS4S0FsZ5ajtkr5xPLts4=
github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
github.com/rs/cors v1.10.1 h1:L0uuZVXIKlI1SShY2nhFfo44TYvDPQ1w4oFkUJNfhyo=
github.com/rs/cors v1.10.1/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
54 changes: 30 additions & 24 deletions backend/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,8 @@ import (
"net/http"
"net/url"
"os"
"strconv"
"sort"
"strings"
"time"

"github.com/joho/godotenv"
Expand All @@ -19,13 +20,14 @@ import (
)

type QuestionPaper struct {
ID int `json:"id"`
CourseCode string `json:"course_code"`
CourseName string `json:"course_name"`
Year int `json:"year"`
Exam string `json:"exam"`
FileLink string `json:"filelink"`
FromLibrary bool `json:"from_library"`
ID int `json:"id"`
CourseCode string `json:"course_code"`
CourseName string `json:"course_name"`
Year int `json:"year"`
Exam string `json:"exam"`
FileLink string `json:"filelink"`
FromLibrary bool `json:"from_library"`
Score float64 `json:"score"`
}

var (
Expand Down Expand Up @@ -103,34 +105,25 @@ func search(w http.ResponseWriter, r *http.Request) {
http.Error(w, "course is required", http.StatusBadRequest)
return
}
query := fmt.Sprintf(`SELECT * FROM qp WHERE course_name like '%%?%%' OR course_code like '%%?%%'`)
fmt.Println(course)
query := "SELECT * FROM qp"
var params []interface{}
params = append(params, course, course)

year := r.URL.Query().Get("year")
if year != "" {
yearInt, err := strconv.Atoi(year)
if err != nil {
http.Error(w, "year must be a number", http.StatusBadRequest)
return
}
query = fmt.Sprintf(`%s AND year = ?`, query)
params = append(params, strconv.Itoa(yearInt))
}

exam := r.URL.Query().Get("exam")
if exam != "" {
query = fmt.Sprintf(`%s AND exam = '?'`, query)
query = "SELECT * FROM qp WHERE exam = ? OR exam=''"
params = append(params, exam)
}
fmt.Println(query)
fmt.Println(params...)
// help me do search using fuzzy search usign fuzzy package

rows, err := db.Query(query, params...)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer rows.Close()

var qps []QuestionPaper = make([]QuestionPaper, 0)
for rows.Next() {
qp := QuestionPaper{}
Expand All @@ -140,7 +133,20 @@ func search(w http.ResponseWriter, r *http.Request) {
return
}
qp.FileLink = fmt.Sprintf("%s/%s", staticFilesUrl, url.PathEscape(qp.FileLink))
qps = append(qps, qp)
qp.CourseName = strings.ReplaceAll(qp.CourseName, "_", "")
qp.Score = StringScore(qp.FileLink, course, 0.3)

if qp.Score > 0 {
qps = append(qps, qp)
}
}

sort.Slice(qps, func(i, j int) bool {
return qps[i].Score > qps[j].Score
})

if len(qps) > 15 {
qps = qps[:15]
}

http.Header.Add(w.Header(), "content-type", "application/json")
Expand Down
74 changes: 74 additions & 0 deletions backend/string_score.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
// Credits: http://joshaven.com/string_score/

package main

import (
"strings"
)

func StringScore(prim string, sec string, fuzz float64) float64 {
if prim == sec {
return 1
}
if sec == "" {
return 0
}
score := 0.0
a := 0
g := strings.ToLower(prim)
n := len(prim)
h := strings.ToLower(sec)
k := len(sec)
var b int
l := 1.0

if fuzz > 0 {
for i := 0; i < k; i++ {
b = strings.Index(g[a:], string(h[i]))
if b == -1 {
l += 1 - fuzz
} else {
b += a
if a == b {
a = 7
} else {
a = 1
if prim[b-1] == ' ' {
a += 8
}
}
if prim[b] == sec[i] {
a += 1
}
score += float64(a) / 10
a = b + 1
}
}
} else {
for i := 0; i < k; i++ {
b = strings.Index(g[a:], string(h[i]))
if b == -1 {
return 0
}
b += a
if a == b {
a = 7
} else {
a = 1
if prim[b-1] == ' ' {
a += 8
}
}
if prim[b] == sec[i] {
a += 1
}
score += float64(a) / 10
a = b + 1
}
}
score = (0.5 * (score/float64(n) + score/float64(k))) / l
if h[0] == g[0] && score < 0.85 {
score += 0.15
}
return score
}
3 changes: 1 addition & 2 deletions go.work.sum
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Original file line number Diff line number Diff line change
@@ -1,2 +1 @@
golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=