feat(gradle): add dep location support

pkg/gradle/lockfile/parse.go

@@ -2,6 +2,7 @@ package lockfile
 
 import (
 	"bufio"
+	"fmt"
 	"strings"
 
 	dio "github.com/aquasecurity/go-dep-parser/pkg/io"
@@ -18,7 +19,9 @@ func NewParser() types.Parser {
 func (Parser) Parse(r dio.ReadSeekerAt) ([]types.Library, []types.Dependency, error) {
 	var libs []types.Library
 	scanner := bufio.NewScanner(r)
+	var lineNum int
 	for scanner.Scan() {
+		lineNum++
 		line := strings.TrimSpace(scanner.Text())
 		if strings.HasPrefix(line, "#") { // skip comments
 			continue
@@ -29,9 +32,19 @@ func (Parser) Parse(r dio.ReadSeekerAt) ([]types.Library, []types.Dependency, er
 		if len(dep) != 3 { // skip the last line with lists of empty configurations
 			continue
 		}
+
+		name := strings.Join(dep[:2], ":")
+		version := strings.Split(dep[2], "=")[0] // remove classPaths
 		libs = append(libs, types.Library{
-			Name:    strings.Join(dep[:2], ":"),
-			Version: strings.Split(dep[2], "=")[0], // remove classPaths
+			ID:      fmt.Sprintf("%s:%s", name, version),
+			Name:    name,
+			Version: version,
+			Locations: []types.Location{
+				{
+					StartLine: lineNum,
+					EndLine:   lineNum,
+				},
+			},
 		})
 
 	}

pkg/gradle/lockfile/parse_test.go

@@ -21,16 +21,37 @@ func TestParser_Parse(t *testing.T) {
 			inputFile: "testdata/happy.lockfile",
 			want: []types.Library{
 				{
+					ID:      "cglib:cglib-nodep:2.1.2",
 					Name:    "cglib:cglib-nodep",
 					Version: "2.1.2",
+					Locations: []types.Location{
+						{
+							StartLine: 4,
+							EndLine:   4,
+						},
+					},
 				},
 				{
+					ID:      "org.springframework:spring-asm:3.1.3.RELEASE",
 					Name:    "org.springframework:spring-asm",
 					Version: "3.1.3.RELEASE",
+					Locations: []types.Location{
+						{
+							StartLine: 5,
+							EndLine:   5,
+						},
+					},
 				},
 				{
+					ID:      "org.springframework:spring-beans:5.0.5.RELEASE",
 					Name:    "org.springframework:spring-beans",
 					Version: "5.0.5.RELEASE",
+					Locations: []types.Location{
+						{
+							StartLine: 6,
+							EndLine:   6,
+						},
+					},
 				},
 			},
 		},