adding translation for in-memory RML

VERSION

@@ -1 +1 @@
-1.1.5
+1.2

src/yatter/__init__.py

@@ -17,13 +17,14 @@ def translate(yarrrml_data, mapping_format=RML_URI):
     rml_mapping.extend(generate_database_connections(yarrrml_data, list_initial_sources))
     rml_mapping.extend(add_logical_targets(yarrrml_data))
     rml_mapping.extend(add_functions(yarrrml_data))
+    external_refs = []
     try:
         mappings, mapping_format = get_non_asserted_mappings(yarrrml_data, mapping_format)
         for mapping in yarrrml_data.get(YARRRML_MAPPINGS):
             if mapping_format == R2RML_URI:
                 source_list = add_table(yarrrml_data, mapping, list_initial_sources)
             else:
-                source_list = add_source(yarrrml_data, mapping, list_initial_sources)
+                source_list, external_refs = add_source(yarrrml_data, mapping, list_initial_sources)
             subject_list = add_subject(yarrrml_data, mapping, mapping_format)
             pred = add_predicate_object_maps(yarrrml_data, mapping, mapping_format)
             it = 0
@@ -37,6 +38,9 @@ def translate(yarrrml_data, mapping_format=RML_URI):
                     rml_mapping[len(rml_mapping) - 1] = rml_mapping[len(rml_mapping) - 1][:-2]
                     rml_mapping.append(".\n\n\n")
                     it = it + 1
+            external_refs = list(dict.fromkeys(external_refs))
+            for ref in external_refs:
+                rml_mapping.append(ref)
 
         logger.info("RML content is created!")
         rml_mapping_string = "".join(rml_mapping)

src/yatter/constants.py

@@ -21,13 +21,15 @@
 VOID_URI = 'http://rdfs.org/ns/void#'
 FNML_URI = 'http://semweb.mmlab.be/ns/fnml#'
 GREL_URI = 'http://users.ugent.be/~bjdmeest/function/grel.ttl#'
+SD_URI = 'https://w3id.org/okn/o/sd/'
 
 RML_PREFIX = '@prefix'
 RML_BASE = '@base'
 RML_LOGICAL_SOURCE_CLASS = 'rml:LogicalSource'
 RML_LOGICAL_SOURCE = 'rml:logicalSource'
 RML_SOURCE = 'rml:source'
 RML_REFERENCE_FORMULATION = 'rml:referenceFormulation'
+RML_REFERENCE_FORMULATION_CLASS = 'rml:ReferenceFormulation'
 RML_ITERATOR = 'rml:iterator'
 RML_REFERENCE = 'rml:reference'
 RML_LANGUAGE_MAP = 'rml:languageMap'
@@ -103,7 +105,16 @@
 D2RQ_USER = 'd2rq:username'
 D2RQ_PASS = 'd2rq:password'
 
-
+##############################################################################
+#############################   SD CONSTANTS  ###########################
+##############################################################################
+SD_DATASET_SPEC = 'sd:DatasetSpecification'
+SD_NAME = 'sd:name'
+SD_HAS_DATA_TRANSFORMATION = 'sd:hasDataTransformation'
+SD_HAS_SOFTWARE_REQUIREMENTS = 'sd:hasSoftwareRequirements'
+SD_HAS_SOURCE_CODE= 'sd:hasSourceCode'
+SD_PROGRAMMING_LANGUAGE =  'sd:programmingLanguage'
+KG4DI_DEFINED_BY = 'kg4di:definedBy'
 ##############################################################################
 #############################   YARRRML CONSTANTS  ###########################
 ##############################################################################
@@ -122,6 +133,11 @@
 YARRRML_USERNAME = 'username'
 YARRRML_PASSWORD = 'password'
 
+YARRRML_STRUCTURE_DEFINER = 'structureDefiner'
+YARRRML_SOFTWARE_SPECIFICATION = 'softwareSpecification'
+YARRRML_PROGRAMMING_LANGUAGE = 'programmingLanguage'
+YARRRML_SOFTWARE_REQUIREMENTS = 'softwareRequirements'
+
 YARRRML_MAPPINGS = 'mappings' # used for mappings in conditions and mappings main key
 YARRRML_MAPPING = 'mapping'
 YARRRRL_MAPPINGS_SHORTCUT = 'm'

src/yatter/predicateobject.py

@@ -288,7 +288,7 @@ def ref_mapping(data, mapping, om, yarrrml_key, ref_type_property, mapping_forma
         else:
             if mapping_format == STAR_URI:
                 object = STAR_OBJECT
-            source_list = add_source(data, mapping_join, list_initial_sources)
+            source_list, external_refs = add_source(data, mapping_join, list_initial_sources)
 
         number_joins_rml = len(subject_list) * len(source_list)
         for i in range(number_joins_rml):

src/yatter/source.py

@@ -30,6 +30,7 @@ def add_source(data, mapping, list_initial_sources):
     source_template = "\t" + RML_LOGICAL_SOURCE + " [\n\t\ta " + RML_LOGICAL_SOURCE_CLASS + \
                       ";\n\t\t" + RML_SOURCE + " "
     final_list = []
+    external_references_list = []
     sources = get_sources(data, mapping)
     for source in sources:
         db_identifier = mapping
@@ -40,13 +41,24 @@ def add_source(data, mapping, list_initial_sources):
         if YARRRML_ACCESS in source:
             if YARRRML_QUERY in source:
                 final_list.append(source_template + database_source(mapping, source, db_identifier))
+            elif YARRRML_STRUCTURE_DEFINER in source:
+                source, external_references = add_in_memory_source(mapping,source)
+                final_list.append(source_template + source)
+                if external_references is not None:
+                    external_references_list.append(external_references)
             else:
                 final_list.append(source_template + add_source_full(mapping, source))
         elif type(source) is list:
-            final_list.append(source_template + add_source_simplified(mapping, source))
+            if "$(" in source[0]:
+                source, external_references = add_in_memory_source(mapping, source)
+                final_list.append(source_template + source)
+                if external_references is not None:
+                    external_references_list.append(external_references)
+            else:
+                final_list.append(source_template + add_source_simplified(mapping, source))
         else:
             raise Exception("ERROR: source " + source + " in mapping " + mapping + " not valid")
-    return final_list
+    return final_list, external_references_list
 
 
 def add_table(data, mapping, list_initial_sources):
@@ -105,6 +117,53 @@ def add_source_simplified(mapping, source):
                           + source[1] + "\";\n\t];\n"
     return source_rdf
 
+def add_in_memory_source(mapping, source):
+    external_reference_formulation = None
+    if type(source) is list:
+        source = extend_in_memory(source)
+    source_rdf = "[\n\t\t\ta " + SD_DATASET_SPEC + ";\n\t\t\t"
+
+    access = str(source.get(YARRRML_ACCESS)).replace("$(","").replace(")","")
+    source_rdf += SD_NAME + " \"" + access + "\";\n"
+
+    if YARRRML_SOFTWARE_SPECIFICATION in source:
+        source_rdf += "\t\t\t" + SD_HAS_DATA_TRANSFORMATION + "[\n\t\t\t\t"
+
+        if YARRRML_SOFTWARE_REQUIREMENTS in source.get(YARRRML_SOFTWARE_SPECIFICATION):
+            software_requirements = str(source.get(YARRRML_SOFTWARE_SPECIFICATION)[YARRRML_SOFTWARE_REQUIREMENTS])
+            source_rdf += SD_HAS_SOFTWARE_REQUIREMENTS + " \""+ software_requirements +"\";\n\t\t\t\t"
+
+        if YARRRML_PROGRAMMING_LANGUAGE in source.get(YARRRML_SOFTWARE_SPECIFICATION):
+            programming_language = str(source.get(YARRRML_SOFTWARE_SPECIFICATION)[YARRRML_PROGRAMMING_LANGUAGE])
+            source_rdf += SD_HAS_SOURCE_CODE +"[\n\t\t\t\t\t" + SD_PROGRAMMING_LANGUAGE + " \"" + programming_language + "\";"
+            source_rdf +="\n\t\t\t\t];\n"
+
+        source_rdf += "\t\t\t];\n"
+    source_rdf += "\t\t];\n"
+
+    if YARRRML_ITERATOR in source:
+        source_rdf += "\t\t" + RML_ITERATOR + " \"" + source.get(YARRRML_ITERATOR) + "\";\n"
+
+    if YARRRML_REFERENCE_FORMULATION in source:
+        reference_formulation = str(source.get(YARRRML_REFERENCE_FORMULATION))
+        source_rdf += "\t\t" + RML_REFERENCE_FORMULATION + " ql:"+ reference_formulation + ";\n"
+        external_reference_formulation = "ql:" + reference_formulation + " a " + RML_REFERENCE_FORMULATION_CLASS +";\n"
+        external_reference_formulation +="\t" + KG4DI_DEFINED_BY +" \""+source.get(YARRRML_STRUCTURE_DEFINER) +"\"."
+    source_rdf += "\t];\n"
+
+
+
+    return source_rdf, external_reference_formulation
+
+def extend_in_memory(source):
+    features = source[0].split("~")
+    access = features[0]
+    defined_by = features[1].split("-")[0]
+    reference_formulation = features[1].split("-")[1]
+    extended_source = {"access": access, "structureDefiner": defined_by, "referenceFormulation": reference_formulation}
+    if len(source) == 2:
+        extended_source["iterator"] = source[1]
+    return extended_source
 
 def add_source_full(mapping, source):
     source_rdf = ""

test/rml-in-memory/IMTC001/mapping.ttl

@@ -0,0 +1,46 @@
+@prefix insta: <http://instagram.com/data/>.
+@prefix rr: <http://www.w3.org/ns/r2rml#>.
+@prefix rml: <http://semweb.mmlab.be/ns/rml#>.
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
+@prefix sd: <https://w3id.org/okn/o/sd/>.
+@prefix kg4di: <https://w3id.org/kg4di/>.
+@prefix ql: <http://semweb.mmlab.be/ns/ql#>.
+@base <http://example.com/ns#>.
+
+
+<df_map_0> a rr:TriplesMap;
+
+    rml:logicalSource [
+        a rml:LogicalSource;
+        rml:source [
+            a sd:DatasetSpecification;
+            sd:name "output_dataframe";
+            sd:hasDataTransformation[
+                    sd:hasSoftwareRequirements "pandas>=1.1.0";
+                    sd:hasSourceCode[
+                            sd:programmingLanguage "Python3.9";
+                    ];
+            ];
+        ];
+        rml:referenceFormulation ql:DataFrame;
+    ];
+    rr:subjectMap [
+        a rr:SubjectMap;
+        rr:template "http://instagram.com/data/user{Id}";
+    ];
+    rr:predicateObjectMap [
+        rr:predicateMap [
+            a rr:PredicateMap;
+            rr:constant rdf:type;
+        ];
+        rr:objectMap [
+            a rr:ObjectMap;
+            rr:constant insta:User;
+        ];
+    ].
+
+
+ql:DataFrame a rml:ReferenceFormulation;
+        kg4di:definedBy "Pandas".

test/rml-in-memory/IMTC001/mappings.yml → test/rml-in-memory/IMTC001/mapping.yml

@@ -14,10 +14,10 @@ mappings:
     sources:
       access: $(output_dataframe)
       referenceFormulation: DataFrame
-			structureDefiner: Pandas
-			softwareSpecification: 
-				programmingLanguage: Python3.9
-				softwareRequirements: “pandas>=1.1.0”
-    s: http://instagram.com/data/user{Id}
+      structureDefiner: Pandas
+      softwareSpecification:
+        programmingLanguage: Python3.9
+        softwareRequirements: pandas>=1.1.0
+    s: http://instagram.com/data/user$(Id)
     po:
        - [a, insta:User]

test/rml-in-memory/IMTC001/test_imtc001.py

@@ -0,0 +1,26 @@
+__author__ = "Ioannis Dasoulas"
+__credits__ = ["Ioannis Dasoulas"]
+
+__license__ = "Apache-2.0"
+__maintainer__ = "David Chaves-Fraga"
+__email__ = "[email protected]"
+
+
+import os
+from ruamel.yaml import YAML
+import yatter
+from rdflib.graph import Graph
+from rdflib import compare
+RML_URI = 'http://semweb.mmlab.be/ns/rml#'
+
+
+def test_imtc001():
+    expected_mapping = Graph()
+    expected_mapping.parse(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mapping.ttl'), format="ttl")
+
+    translated_mapping = Graph()
+    yaml = YAML(typ='safe', pure=True)
+    mapping_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mapping.yml')
+    translated_mapping.parse(data=yatter.translate(yaml.load(open(mapping_path)), mapping_format=RML_URI), format="ttl")
+
+    assert compare.isomorphic(expected_mapping, translated_mapping)

test/rml-in-memory/IMTC003/mappings.rml.ttl → test/rml-in-memory/IMTC002/mapping.ttl

@@ -5,10 +5,11 @@
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
 @prefix sd: <https://w3id.org/okn/o/sd/>.
-@prefix kg4di: <https://w3id.org/kg4di/definedBy>.
+@prefix kg4di: <https://w3id.org/kg4di/>.
+@prefix ql: <http://semweb.mmlab.be/ns/ql#>.
+@base <http://example.com/ns#>.
 
-
-<df_map> a rr:TriplesMap;
+<df_map_0> a rr:TriplesMap;
 
 	rml:logicalSource [
 		a rml:LogicalSource;

test/rml-in-memory/IMTC002/mappings.yml → test/rml-in-memory/IMTC002/mapping.yml

@@ -14,7 +14,7 @@ mappings:
     sources:
       access: $(output_dataframe)
       referenceFormulation: DataFrame
-			structureDefiner: Pandas
-    s: http://instagram.com/data/user{Id}
+      structureDefiner: Pandas
+    s: http://instagram.com/data/user$(Id)
     po:
-       - [a, insta:User]
+      - [a, insta:User]

test/rml-in-memory/IMTC002/test_imtc002.py

@@ -0,0 +1,26 @@
+__author__ = "Ioannis Dasoulas"
+__credits__ = ["Ioannis Dasoulas"]
+
+__license__ = "Apache-2.0"
+__maintainer__ = "David Chaves-Fraga"
+__email__ = "[email protected]"
+
+
+import os
+from ruamel.yaml import YAML
+import yatter
+from rdflib.graph import Graph
+from rdflib import compare
+RML_URI = 'http://semweb.mmlab.be/ns/rml#'
+
+
+def test_imtc002():
+    expected_mapping = Graph()
+    expected_mapping.parse(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mapping.ttl'), format="ttl")
+
+    translated_mapping = Graph()
+    yaml = YAML(typ='safe', pure=True)
+    mapping_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mapping.yml')
+    translated_mapping.parse(data=yatter.translate(yaml.load(open(mapping_path)), mapping_format=RML_URI), format="ttl")
+
+    assert compare.isomorphic(expected_mapping, translated_mapping)

test/rml-in-memory/IMTC002/mappings.rml.ttl → test/rml-in-memory/IMTC003/mapping.ttl

@@ -5,10 +5,11 @@
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
 @prefix sd: <https://w3id.org/okn/o/sd/>.
-@prefix kg4di: <https://w3id.org/kg4di/definedBy>.
+@prefix kg4di: <https://w3id.org/kg4di/>.
+@prefix ql: <http://semweb.mmlab.be/ns/ql#>.
+@base <http://example.com/ns#>.
 
-
-<df_map> a rr:TriplesMap;
+<df_map_0> a rr:TriplesMap;
 
 	rml:logicalSource [
 		a rml:LogicalSource;

test/rml-in-memory/IMTC003/mappings.yml → test/rml-in-memory/IMTC003/mapping.yml

@@ -13,6 +13,6 @@ mappings:
   df_map:
     sources:
       - [$(output_dataframe)~Pandas-DataFrame]
-    s: http://instagram.com/data/user{Id}
+    s: http://instagram.com/data/user$(Id)
     po:
        - [a, insta:User]