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spdx-license-expression-tools\n\nThe [SPDX specification](https://spdx.org/spdx-specification-21-web-version) was created to exchange licensing information along a software supply chain in a standard way. Part of this specification are license expressions which can be used to describe the licensing of a software in a formal way e.g. `(LGPL-3.0 OR MIT)`.\n\nWithin the [SPDX tools](https://github.com/spdx/tools), the official specification implementation of the SPDX working group, license expressions are represented as `AnyLicenseInfo` composite. Interacting with this composite can be quite complicated, therefore the spdx-license-expression-tools Java library was created to provide various operations that can be performed on SPDX license expressions:\n- simplification\n- filtering\n- merging\n- splitting\n\n## Operations\n\n### Simplification\n\nRemoving of redundant terms and transforming license expressions to the distributed normal form (DNF):\n\n```java\nAnyLicenseInfo expression = LicenseInfoFactory.parseSPDXLicenseString(\"(((LGPL-3.0+ OR MIT) AND GPL-2.0) OR BSD-3-Clause)\");\nExpressionSimplification.simplify(expression); // -\u003e (BSD-3-Clause OR (LGPL-3.0+ AND GPL-2.0) OR (MIT AND GPL-2.0))\n```\n\n### Filtering\n\nRemoving of operators:\n\n```java\nAnyLicenseInfo expression = LicenseInfoFactory.parseSPDXLicenseString(\"LGPL-3.0+ WITH DigiRule-FOSS-exception AND MIT\");\nExpressionFiltering.filterOperators(expression, OperatorFilter.FILTER_ALL); // -\u003e (LGPL-3.0 AND MIT)\n```\n\nRemoving of licenses:\n\n```java\nAnyLicenseInfo expression = LicenseInfoFactory.parseSPDXLicenseString(\"((LGPL-3.0+ AND MIT) AND BSD-3-Clause)\");\nLicenseMatcher matcher = ExpressionFiltering.createLicenseMatcher();\nmatcher.setLicense(LicenseInfoFactory.parseSPDXLicenseString(\"LGPL-3.0+\"));\nExpressionFiltering.filterLicenses(expression, matcher); // -\u003e (MIT AND BSD-3-Clause)\n```\n\n### Merging\n\nJoining with `AND`:\n\n```java\nAnyLicenseInfo expression1 = LicenseInfoFactory.parseSPDXLicenseString(\"LGPL-3.0+ AND MIT\");\nAnyLicenseInfo expression2 = LicenseInfoFactory.parseSPDXLicenseString(\"BSD-3-Clause\");\nExpressionMerging.andJoin(expression1, expression2); // -\u003e ((LGPL-3.0+ AND MIT) AND BSD-3-Clause)\n```\n\nJoining with `OR`:\n\n```java\nAnyLicenseInfo expression1 = LicenseInfoFactory.parseSPDXLicenseString(\"LGPL-3.0+ AND MIT\");\nAnyLicenseInfo expression2 = LicenseInfoFactory.parseSPDXLicenseString(\"BSD-3-Clause\");\nExpressionMerging.orJoin(expression1, expression2); // -\u003e ((LGPL-3.0+ AND MIT) OR BSD-3-Clause)\n```\n\n### Splitting\n\nSplitting to conjunctive sets (after simplification):\n\n```java\nAnyLicenseInfo expression = LicenseInfoFactory.parseSPDXLicenseString(\"(((LGPL-3.0+ OR MIT) AND GPL-2.0) OR BSD-3-Clause)\");\nExpressionSplitting.splitToConjunctiveSets(expression); // -\u003e BSD-3-Clause, (LGPL-3.0+ AND GPL-2.0), (MIT AND GPL-2.0)\n```\n\nSplitting to licenses (list of contents):\n\n```java\nAnyLicenseInfo expression = LicenseInfoFactory.parseSPDXLicenseString(\"(((LGPL-3.0+ OR MIT) AND GPL-2.0) OR BSD-3-Clause)\");\nExpressionSplitting.splitToLicenses(expression); // -\u003e BSD-3-Clause, LGPL-3.0+, GPL-2.0, MIT\n```\n## Compiling and Integration\n\nMaven is used as build system. To build from source use:\n\n```\nmvn package\n```\n\nspdx-license-expression-tools is available via the Maven Central Repository:\n\n```\n\u003cdependency\u003e\n  \u003cgroupId\u003ecom.github.aschet\u003c/groupId\u003e\n  \u003cartifactId\u003espdx-license-expression-tools\u003c/artifactId\u003e\n  \u003cversion\u003e1.1.0\u003c/version\u003e\n\u003c/dependency\u003e\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Faschet%2Fspdx-license-expression-tools","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Faschet%2Fspdx-license-expression-tools","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Faschet%2Fspdx-license-expression-tools/lists"}