Gracefully handle unspecified dependencies

__tests__/expected_dependency_results.ts

@@ -4689,6 +4689,57 @@ export const GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_UNRESOLVED = [
   ],
 ]
 
+
+export const GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_UNSPECIFIED = [
+  [
+    {
+      type: "maven",
+      name: "kotlin-stdlib-jdk8",
+      namespace: "org.jetbrains.kotlin",
+      version: "1.6.10",
+      qualifiers: null,
+      subpath: null,
+    },
+    {
+      type: "maven",
+      name: "kotlin-stdlib",
+      namespace: "org.jetbrains.kotlin",
+      version: "1.6.10",
+      qualifiers: null,
+      subpath: null,
+    },
+  ],
+  [
+    {
+      type: "maven",
+      name: "kotlin-stdlib",
+      namespace: "org.jetbrains.kotlin",
+      version: "1.6.10",
+      qualifiers: null,
+      subpath: null,
+    },
+    {
+      type: "maven",
+      name: "annotations",
+      namespace: "org.jetbrains",
+      version: "13.0",
+      qualifiers: null,
+      subpath: null,
+    },
+  ],
+  [
+    {
+      type: "maven",
+      name: "kotlin-stdlib-jdk8",
+      namespace: "org.jetbrains.kotlin",
+      version: "1.6.10",
+      qualifiers: null,
+      subpath: null,
+    },
+    undefined,
+  ],
+]
+
 export const GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_SPRING = [
   [
     {

__tests__/parse.test.ts

@@ -5,7 +5,8 @@ import {
   GRADLE_EXAMPLE_DEPENDENCY_OUTPUT,
   GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_UNRESOLVED,
   GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_SPRING,
-  GRADLE_EXAMPLE_DEPENDENCY_WITH_SUB_PROJECTS_OUTPUT
+  GRADLE_EXAMPLE_DEPENDENCY_WITH_SUB_PROJECTS_OUTPUT,
+  GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_UNSPECIFIED
 } from './expected_dependency_results'
 
 const GRADLE_DEPENDENCY_OUTPUT = `
@@ -60,6 +61,31 @@ A web-based, searchable dependency report is available by adding the --scan opti
 BUILD SUCCESSFUL in 555ms
 1 actionable task: 1 executed`
 
+
+const GRADLE_DEPENDENCY_OUTPUT_UNSPECIFIED = `
+> Task :app:dependencies
+
+------------------------------------------------------------
+Project ':app'
+------------------------------------------------------------
+
+debugCompileClasspath - Compile classpath for compilation 'debug' (target  (androidJvm)).
++--- org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.10
+|    +--- org.jetbrains.kotlin:kotlin-stdlib:1.6.10
+|    |    +--- org.jetbrains:annotations:13.0
+|    |    \\--- unspecified (n)
++--- org.jetbrains:annotations:{strictly 13.0} -> 13.0 (c)
+\\--- org.jetbrains.kotlin:kotlin-stdlib-common:{strictly 1.6.10} -> 1.6.10 (c)
+
+(c) - dependency constraint
+(*) - dependencies omitted (listed previously)
+
+A web-based, searchable dependency report is available by adding the --scan option.
+
+BUILD SUCCESSFUL in 555ms
+1 actionable task: 1 executed`
+
+
 const GRADLE_DEPENDENCY_OUTPUT_SPRING = `
 Type-safe dependency accessors is an incubating feature.
 
@@ -109,6 +135,13 @@ describe('parseGradleDependencyOutput', () => {
     expect(dependencies).toEqual(GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_UNRESOLVED)
   })
 
+  test('parses output of gradle dependency command with unspecified dependencies', () => {
+    const dependencies = parseGradleGraph('test', GRADLE_DEPENDENCY_OUTPUT_UNSPECIFIED).packages
+
+    expect(Object.values(dependencies).length).toEqual(GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_UNSPECIFIED.length)
+    expect(dependencies).toEqual(GRADLE_EXAMPLE_DEPENDENCY_OUTPUT_UNSPECIFIED)
+  })
+
   test('parses output of gradle dependency command with bom into dependencies', () => {
     const dependencies = parseGradleGraph('test', GRADLE_DEPENDENCY_OUTPUT_SPRING).packages
 

src/parse.ts

@@ -25,7 +25,7 @@ export function parseProjectSpecification(projectString: string, level = 0): Pro
  *
  * Identifies variant of specification (full maven spec or without version (if bom file is used)).
  */
-export function parseGradlePackage(pkg: string, level = 0): PackageURL {
+export function parseGradlePackage(pkg: string, level = 0): PackageURL | undefined {
   const stripped = pkg.substring((level + 1) * DEPENDENCY_LEVEL_INLINE).trimEnd()
   const split = stripped.split(':')
   let packageName = ''
@@ -38,16 +38,19 @@ export function parseGradlePackage(pkg: string, level = 0): PackageURL {
       ;[libraryName, lineEnd] = secondaryParts
     } else {
       if (split[1].trim().endsWith(DEPENDENCY_NOT_RESOLVED)) {
-        core.warning(`Discovered unresolved dependency: ${pkg}`)
+        core.warning(`Discovered unresolved dependency: ${stripped}`)
         libraryName = split[1].trim().replace(DEPENDENCY_NOT_RESOLVED, '')
       } else {
-        core.error(`Could not parse package: '${pkg}' (1)`)
-        throw Error(`The given '${pkg} can't be parsed as a gradle package.`)
+        core.error(`Could not parse package: '${stripped}' (1)`)
+        throw Error(`The given '${stripped} can't be parsed as a gradle package.`)
       }
     }
+  } else if (split.length === 1 && stripped.trim().endsWith(DEPENDENCY_NOT_RESOLVED)) {
+    core.warning(`Could not parse unresolved package: '${stripped}' (3)`)
+    return undefined
   } else if (split.length < 3) {
-    core.error(`Could not parse package: '${pkg}' (2)`)
-    throw Error(`The given '${pkg} can't be parsed as a gradle package.`)
+    core.error(`Could not parse package: '${stripped}' (2)`)
+    throw Error(`The given '${stripped} can't be parsed as a gradle package.`)
   } else {
     ;[packageName, libraryName, lineEnd] = split
   }
@@ -159,12 +162,14 @@ function parseGradleDependency(
       }
 
       const parent = parseGradlePackage(line, level)
-      if (parentParent) {
-        project.packages.push([parentParent, parent])
-      }
-      parseGradleDependency(rootProject, project, iterator, parent, level + 1, subModuleMode)
-      if (level === 0 || !parentParent) {
-        project.packages.push([parent, undefined])
+      if(parent) {
+        if (parentParent) {
+          project.packages.push([parentParent, parent])
+        }
+        parseGradleDependency(rootProject, project, iterator, parent, level + 1, subModuleMode)
+        if (level === 0 || !parentParent) {
+          project.packages.push([parent, undefined])
+        }
       }
     } else if (
       strippedLine.startsWith(DEPENDENCY_CHILD_INSET[0]) ||