Add tests and fix for @vocab="" test case.

See json-ld/json-ld.org#603 for discussion.

Author: kazarena

ld/context.go

@@ -167,6 +167,12 @@ func (c *Context) parse(localContext interface{}, remoteContexts []string) (*Con
 			} else if vocabString, isString := vocabValue.(string); isString {
 				if IsAbsoluteIri(vocabString) {
 					result.values["@vocab"] = vocabValue
+				} else if vocabString == "" {
+					if baseVal, hasBase := result.values["@base"]; hasBase {
+						result.values["@vocab"] = baseVal
+					} else {
+						return nil, NewJsonLdError(InvalidVocabMapping, "@vocab is empty but @base is not specified")
+					}
 				} else {
 					return nil, NewJsonLdError(InvalidVocabMapping, "@vocab must be an absolute IRI")
 				}

ld/testdata/compact-0095-context.jsonld

@@ -0,0 +1,6 @@
+{
+  "@context": {
+    "@base": "http://example.com/some/",
+    "@vocab": ""
+  }
+}

ld/testdata/compact-0095-in.jsonld

@@ -0,0 +1,13 @@
+[
+  {
+    "@id": "http://example.com/some/deep/directory/and/relativePropertyIris",
+    "http://example.com/absolute": [{"@value": "/absolute"}],
+    "http://example.com/some/deep/directory/": [{"@value": "deep/directory"}],
+    "http://example.com/some/deep/directory/and/": [{"@value": "deep/directory/and/"}],
+    "http://example.com/some/#fragment-works": [{"@value": "#fragment-works"}],
+    "http://example.com/some/?query=works": [{"@value": "?query=works"}],
+    "http://example.com/some/link": [{"@value": "link"}],
+    "http://example.com/some/../parent": [{"@value": "../parent"}],
+    "http://example.com/too-many-dots": [{"@value": "too-many-dots"}]
+  }
+]

ld/testdata/compact-0095-out.jsonld

@@ -0,0 +1,15 @@
+{
+  "@context": {
+    "@base": "http://example.com/some/",
+    "@vocab": ""
+  },
+  "#fragment-works": "#fragment-works",
+  "../parent": "../parent",
+  "?query=works": "?query=works",
+  "@id": "deep/directory/and/relativePropertyIris",
+  "deep/directory/": "deep/directory",
+  "deep/directory/and/": "deep/directory/and/",
+  "http://example.com/absolute": "/absolute",
+  "http://example.com/too-many-dots": "too-many-dots",
+  "link": "link"
+}

ld/testdata/expand-0092-in.jsonld

@@ -0,0 +1,18 @@
+{
+  "@context": {
+    "@base": "http://example.com/some/deep/directory/and/file/",
+    "@vocab": ""
+  },
+  "@id": "relativePropertyIris",
+  "link": "link",
+  "#fragment-works": "#fragment-works",
+  "?query=works": "?query=works",
+  "./": "./",
+  "../": "../",
+  "../parent": "../parent",
+  "../../parent-parent-eq-root": "../../parent-parent-eq-root",
+  "../../../../../still-root": "../../../../../still-root",
+  "../.././.././../../too-many-dots": "../.././.././../../too-many-dots",
+  "/absolute": "/absolute",
+  "//example.org/scheme-relative": "//example.org/scheme-relative"
+}

ld/testdata/expand-0092-out.jsonld

@@ -0,0 +1,16 @@
+[
+  {
+    "@id": "http://example.com/some/deep/directory/and/file/relativePropertyIris",
+    "http://example.com/some/deep/directory/and/file/#fragment-works": [{"@value": "#fragment-works"}],
+    "http://example.com/some/deep/directory/and/file/../": [{"@value": "../"}],
+    "http://example.com/some/deep/directory/and/file/../../../../../still-root": [{"@value": "../../../../../still-root"}],
+    "http://example.com/some/deep/directory/and/file/../.././.././../../too-many-dots": [{"@value": "../.././.././../../too-many-dots"}],
+    "http://example.com/some/deep/directory/and/file/../../parent-parent-eq-root": [{"@value": "../../parent-parent-eq-root"}],
+    "http://example.com/some/deep/directory/and/file/../parent": [{"@value": "../parent"}],
+    "http://example.com/some/deep/directory/and/file/./": [{"@value": "./"}],
+    "http://example.com/some/deep/directory/and/file///example.org/scheme-relative": [{"@value": "//example.org/scheme-relative"}],
+    "http://example.com/some/deep/directory/and/file//absolute": [{"@value": "/absolute"}],
+    "http://example.com/some/deep/directory/and/file/?query=works": [{"@value": "?query=works"}],
+    "http://example.com/some/deep/directory/and/file/link": [{"@value": "link"}]
+  }
+]