Split out RDFa code from jsonld.js.

.eslintrc.js

@@ -0,0 +1,9 @@
+module.exports = {
+  env: {
+    browser: true,
+    commonjs: true,
+    node: true
+  },
+  extends: 'eslint-config-digitalbazaar',
+  root: true
+};

.gitignore

@@ -0,0 +1,12 @@
+*.sublime-project
+*.sublime-workspace
+*.sw[op]
+*~
+.DS_Store
+.cproject
+.project
+.settings
+coverage
+dist
+node_modules
+v8.log

CHANGELOG.md

@@ -0,0 +1,6 @@
+# jsonld-rdfa ChangeLog
+
+## 0.1.0 - 20xx-xx-xx
+
+### Added
+- Split out RDFa code from jsonld.js.

LICENSE

@@ -0,0 +1,40 @@
+You may use the jsonld-rdfa project under the terms of the BSD License. 
+
+You are free to use this project in commercial projects as long as the 
+copyright header is left intact.
+
+If you are a commercial entity and use this set of libraries in your
+commercial software then reasonable payment to Digital Bazaar, if you can
+afford it, is not required but is expected and would be appreciated. If this
+library saves you time, then it's saving you money. The cost of developing
+JSON-LD was on the order of several months of work and tens of
+thousands of dollars. We are attempting to strike a balance between helping
+the development community while not being taken advantage of by lucrative
+commercial entities for our efforts.
+
+-------------------------------------------------------------------------------
+New BSD License (3-clause)
+Copyright (c) 2010, Digital Bazaar, Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of Digital Bazaar, Inc. nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL DIGITAL BAZAAR BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -1,4 +1,40 @@
 jsonld-rdfa
 ===========
 
-...
+[![Dependency Status](https://img.shields.io/david/digitalbazaar/jsonld-rdfa.svg)](https://david-dm.org/digitalbazaar/jsonld-rdfa)
+
+Introduction
+------------
+
+This JavaScript [Node.js][] library is used to register a [RDFa][] parser with
+[jsonld.js][].
+
+## Installation
+
+```
+npm install jsonld-rdfa
+```
+
+## Usage
+
+```js
+// load and register RDFa parser
+require('jsonld-rdfa');
+```
+
+Commercial Support
+------------------
+
+Commercial support for this library is available upon request from
+[Digital Bazaar][]: support@digitalbazaar.com
+
+Source Code
+-----------
+
+http://github.com/digitalbazaar/jsonld-rdfa
+
+[Digital Bazaar]: https://digitalbazaar.com/
+[JSON-LD]: https://json-ld.org/
+[RDFa]: https://www.w3.org/TR/rdfa-core/
+[jsonld.js]: https://github.com/digitalbazaar/jsonld.js
+[Node.js]: https://nodejs.org/

lib/Rdfa.js

@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2017 Digital Bazaar, Inc. All rights reserved.
+ */
+/* global Node, XMLSerializer */
+
+'use strict';
+
+const RDF = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
+const XSD = 'http://www.w3.org/2001/XMLSchema#';
+
+const RDF_LANGSTRING = RDF + 'langString';
+const RDF_PLAIN_LITERAL = RDF + 'PlainLiteral';
+const RDF_OBJECT = RDF + 'object';
+const RDF_XML_LITERAL = RDF + 'XMLLiteral';
+const XSD_STRING = XSD + 'string';
+
+let _Node;
+if(typeof Node !== 'undefined') {
+  _Node = Node;
+} else {
+  _Node = {
+    ELEMENT_NODE: 1,
+    ATTRIBUTE_NODE: 2,
+    TEXT_NODE: 3,
+    CDATA_SECTION_NODE: 4,
+    ENTITY_REFERENCE_NODE: 5,
+    ENTITY_NODE: 6,
+    PROCESSING_INSTRUCTION_NODE: 7,
+    COMMENT_NODE: 8,
+    DOCUMENT_NODE: 9,
+    DOCUMENT_TYPE_NODE: 10,
+    DOCUMENT_FRAGMENT_NODE: 11,
+    NOTATION_NODE: 12
+  };
+}
+
+module.exports = class Rdfa {
+  /**
+   * Parses the RDF dataset found via the data object from the RDFa API.
+   *
+   * @param data the RDFa API data object.
+   *
+   * @return the RDF dataset.
+   */
+  parse(data) {
+    const dataset = {};
+    dataset['@default'] = [];
+
+    const subjects = data.getSubjects();
+    for(let si = 0; si < subjects.length; ++si) {
+      const subject = subjects[si];
+      if(subject === null) {
+        continue;
+      }
+
+      // get all related triples
+      const triples = data.getSubjectTriples(subject);
+      if(triples === null) {
+        continue;
+      }
+      const predicates = triples.predicates;
+      for(const predicate in predicates) {
+        // iterate over objects
+        const objects = predicates[predicate].objects;
+        for(let oi = 0; oi < objects.length; ++oi) {
+          const object = objects[oi];
+
+          // create RDF triple
+          const triple = {};
+
+          // add subject
+          if(subject.indexOf('_:') === 0) {
+            triple.subject = {type: 'blank node', value: subject};
+          } else {
+            triple.subject = {type: 'IRI', value: subject};
+          }
+
+          // add predicate
+          if(predicate.indexOf('_:') === 0) {
+            triple.predicate = {type: 'blank node', value: predicate};
+          } else {
+            triple.predicate = {type: 'IRI', value: predicate};
+          }
+
+          // serialize XML literal
+          let value = object.value;
+          if(object.type === RDF_XML_LITERAL) {
+            // initialize XMLSerializer
+            const XMLSerializer = getXMLSerializerClass();
+            const serializer = new XMLSerializer();
+            value = '';
+            for(let x = 0; x < object.value.length; x++) {
+              if(object.value[x].nodeType === _Node.ELEMENT_NODE) {
+                value += serializer.serializeToString(object.value[x]);
+              } else if(object.value[x].nodeType === _Node.TEXT_NODE) {
+                value += object.value[x].nodeValue;
+              }
+            }
+          }
+
+          // add object
+          triple.object = {};
+
+          // object is an IRI
+          if(object.type === RDF_OBJECT) {
+            if(object.value.indexOf('_:') === 0) {
+              triple.object.type = 'blank node';
+            } else {
+              triple.object.type = 'IRI';
+            }
+          } else {
+            // object is a literal
+            triple.object.type = 'literal';
+            if(object.type === RDF_PLAIN_LITERAL) {
+              if(object.language) {
+                triple.object.datatype = RDF_LANGSTRING;
+                triple.object.language = object.language;
+              } else {
+                triple.object.datatype = XSD_STRING;
+              }
+            } else {
+              triple.object.datatype = object.type;
+            }
+          }
+          triple.object.value = value;
+
+          // add triple to dataset in default graph
+          dataset['@default'].push(triple);
+        }
+      }
+    }
+
+    return dataset;
+  }
+};
+
+function getXMLSerializerClass() {
+  if(typeof XMLSerializer === 'undefined') {
+    return require('xmldom').XMLSerializer;
+  }
+  return XMLSerializer;
+}

lib/index.js

@@ -0,0 +1,12 @@
+/**
+ * RDFa plugin for jsonld.js.
+ *
+ * @author Digital Bazaar, Inc.
+ *
+ * Copyright 2010-2019 Digital Bazaar, Inc.
+ */
+if(require('semver').gte(process.version, '8.6.0')) {
+  module.exports = require('./jsonld-rdfa');
+} else {
+  module.exports = require('../dist/node6/lib/jsonld-rdfa');
+}

lib/jsonld-rdfa.js

@@ -0,0 +1,40 @@
+/**
+ * A RDFa plugin for jsonld.js.
+ *
+ * @author Digital Bazaar, Inc.
+ *
+ * @license BSD 3-Clause License
+ * Copyright (c) 2011-2019 Digital Bazaar, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of the Digital Bazaar, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+const jsonld = require('jsonld');
+const Rdfa = require('./Rdfa');
+
+// register the RDFa API RDF parser
+jsonld.registerRDFParser('rdfa-api', Rdfa.parse);

package.json

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+{
+  "name": "jsonld-rdfa",
+  "version": "0.1.0-dev",
+  "description": "A jsonld.js plugin to hande RDFa.",
+  "homepage": "https://github.com/digitalbazaar/jsonld-rdfa",
+  "author": {
+    "name": "Digital Bazaar, Inc.",
+    "email": "support@digitalbazaar.com",
+    "url": "https://digitalbazaar.com/"
+  },
+  "contributors": [
+    "Dave Longley <dlongley@digitalbazaar.com>",
+    "David I. Lehn <dlehn@digitalbazaar.com>"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/digitalbazaar/jsonld-rdfa"
+  },
+  "bugs": {
+    "url": "https://github.com/digitalbazaar/jsonld-rdfa/issues",
+    "email": "support@digitalbazaar.com"
+  },
+  "license": "BSD-3-Clause",
+  "main": "lib/index.js",
+  "files": [
+    "dist/*.js",
+    "dist/*.js.map",
+    "dist/node6/**/*.js",
+    "lib/*.js",
+    "lib/**/*.js"
+  ],
+  "dependencies": {
+    "semver": "^6.3.0",
+    "xmldom": "0.1.19"
+  },
+  "peerDependencies": {
+    "jsonld": "^1.8.1"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.7.5",
+    "@babel/core": "^7.7.5",
+    "@babel/plugin-proposal-object-rest-spread": "^7.7.4",
+    "@babel/plugin-transform-modules-commonjs": "^7.7.5",
+    "@babel/plugin-transform-runtime": "^7.7.5",
+    "@babel/preset-env": "^7.7.5",
+    "@babel/register": "^7.7.4",
+    "@babel/runtime": "^7.7.5",
+    "babel-loader": "^8.0.5",
+    "core-js": "^3.4.7",
+    "eslint": "^6.7.2",
+    "eslint-config-digitalbazaar": "^2.0.1",
+    "regenerator-runtime": "^0.13.3",
+    "webpack": "^4.29.5",
+    "webpack-cli": "^3.2.3",
+    "webpack-merge": "^4.2.1"
+  },
+  "engines": {
+    "node": ">=6"
+  },
+  "keywords": [
+    "JSON",
+    "JSON-LD",
+    "Linked Data",
+    "RDF",
+    "RDFa",
+    "Semantic Web",
+    "jsonld"
+  ],
+  "scripts": {
+    "prepublish": "npm run build",
+    "build": "npm run build-webpack && npm run build-node6",
+    "build-webpack": "webpack",
+    "build-node6": "BROWSERSLIST='node 6' babel --no-babelrc lib --out-dir dist/node6/lib --presets=@babel/preset-env",
+    "lint": "eslint *.js lib/**.js"
+  },
+  "browser": {
+    "lib/index.js": "./lib/jsonld-rdfa.js",
+    "jsonld": false,
+    "xmldom": false
+  }
+}