Class: JSON::LD::EvaluationContext
- Inherits:
-
Object
- Object
- JSON::LD::EvaluationContext
- Includes:
- Utils
- Defined in:
- lib/json/ld/evaluation_context.rb
Overview
:nodoc:
Instance Attribute Summary collapse
-
#base ⇒ Object
readonly
The base.
-
#coercions ⇒ Object
Type coersion.
-
#containers ⇒ Object
List coercion.
-
#context_base ⇒ Object
The base IRI of the context, if loaded remotely.
-
#default_language ⇒ Object
Default language.
-
#iri_to_curie ⇒ Object
Reverse mappings from IRI to a term or CURIE.
-
#iri_to_term ⇒ Object
Reverse mappings from IRI to term only for terms, not CURIEs.
-
#languages ⇒ Object
Language coercion.
-
#mappings ⇒ Object
A list of current, in-scope mappings from term to IRI.
-
#options ⇒ Object
Global options used in generating IRIs.
-
#provided_context ⇒ Object
A context provided to us that we can use without re-serializing.
-
#vocab ⇒ Object
Default vocabulary.
Instance Method Summary collapse
-
#alias(value) ⇒ String
Reverse term mapping, typically used for finding aliases for keys.
-
#coerce(property) ⇒ RDF::URI, '@id'
Retrieve term coercion.
-
#compact_iri(iri, options = {}) ⇒ String
Compact an IRI.
-
#compact_value(property, value, options = {}) ⇒ Hash
Compact a value.
-
#container(property) ⇒ String
Retrieve container mapping, add it if ‘value` is provided.
- #dup ⇒ Object
-
#expand_iri(iri, options = {}) ⇒ RDF::URI, String
Expand an IRI.
-
#expand_value(property, value, options = {}) ⇒ Hash
Expand a value from compacted to expanded form making the context unnecessary.
-
#initialize(options = {}) {|ec| ... } ⇒ EvaluationContext
constructor
Create new evaluation context.
- #inspect ⇒ Object
-
#language(property) ⇒ String
Retrieve the language associated with a property, or the default language otherwise.
-
#mapping(term) ⇒ RDF::URI, String
Retrieve term mapping.
-
#parse(context) ⇒ Object
Create an Evaluation Context using an existing context as a start by parsing the input.
-
#serialize(options = {}) ⇒ Hash
Generate @context.
-
#set_coerce(property, value) ⇒ RDF::URI, '@id'
Set term coercion.
-
#set_container(property, value) ⇒ Boolean
Set container mapping.
-
#set_language(property, value) ⇒ String
Set language mapping.
-
#set_mapping(term, value) ⇒ RDF::URI, String
Set term mapping.
-
#term_valid?(term) ⇒ Boolean
Determine if ‘term` is a suitable term.
Methods included from Utils
#blank_node?, #list?, #node?, #node_reference?, #value?
Constructor Details
#initialize(options = {}) {|ec| ... } ⇒ EvaluationContext
Create new evaluation context
93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 |
# File 'lib/json/ld/evaluation_context.rb', line 93 def initialize( = {}) @base = RDF::URI([:base]) if [:base] @mappings = {} @coercions = {} @containers = {} @languages = {} @iri_to_curie = {} @iri_to_term = { RDF.to_uri.to_s => "rdf", RDF::XSD.to_uri.to_s => "xsd" } @options = # Load any defined prefixes ([:prefixes] || {}).each_pair do |k, v| @iri_to_term[v.to_s] = k unless k.nil? end debug("init") {"iri_to_term: #{iri_to_term.inspect}"} yield(self) if block_given? end |
Instance Attribute Details
#base ⇒ Object (readonly)
The base.
The document base IRI, used for expanding relative IRIs.
14 15 16 |
# File 'lib/json/ld/evaluation_context.rb', line 14 def base @base end |
#coercions ⇒ Object
Type coersion
The @type keyword is used to specify type coersion rules for the data. For each key in the map, the key is a String representation of the property for which String values will be coerced and the value is the datatype (or @id) to coerce to. Type coersion for the value ‘@id` asserts that all vocabulary terms listed should undergo coercion to an IRI, including CURIE processing for compact IRI Expressions like `foaf:homepage`.
45 46 47 |
# File 'lib/json/ld/evaluation_context.rb', line 45 def coercions @coercions end |
#containers ⇒ Object
List coercion
The @container keyword is used to specify how arrays are to be treated. A value of @list indicates that arrays of values are to be treated as an ordered list. A value of @set indicates that arrays are to be treated as unordered and that singular values are always coerced to an array form on expansion and compaction.
54 55 56 |
# File 'lib/json/ld/evaluation_context.rb', line 54 def containers @containers end |
#context_base ⇒ Object
The base IRI of the context, if loaded remotely.
19 20 21 |
# File 'lib/json/ld/evaluation_context.rb', line 19 def context_base @context_base end |
#default_language ⇒ Object
Default language
This adds a language to plain strings that aren’t otherwise coerced
71 72 73 |
# File 'lib/json/ld/evaluation_context.rb', line 71 def default_language @default_language end |
#iri_to_curie ⇒ Object
Reverse mappings from IRI to a term or CURIE
29 30 31 |
# File 'lib/json/ld/evaluation_context.rb', line 29 def iri_to_curie @iri_to_curie end |
#iri_to_term ⇒ Object
Reverse mappings from IRI to term only for terms, not CURIEs
34 35 36 |
# File 'lib/json/ld/evaluation_context.rb', line 34 def iri_to_term @iri_to_term end |
#languages ⇒ Object
Language coercion
The @language keyword is used to specify language coercion rules for the data. For each key in the map, the key is a String representation of the property for which String values will be coerced and the value is the language to coerce to. If no property-specific language is given, any default language from the context is used.
64 65 66 |
# File 'lib/json/ld/evaluation_context.rb', line 64 def languages @languages end |
#mappings ⇒ Object
A list of current, in-scope mappings from term to IRI.
24 25 26 |
# File 'lib/json/ld/evaluation_context.rb', line 24 def mappings @mappings end |
#options ⇒ Object
Global options used in generating IRIs
83 84 85 |
# File 'lib/json/ld/evaluation_context.rb', line 83 def @options end |
#provided_context ⇒ Object
A context provided to us that we can use without re-serializing
86 87 88 |
# File 'lib/json/ld/evaluation_context.rb', line 86 def provided_context @provided_context end |
#vocab ⇒ Object
Default vocabulary
Sets the default vocabulary used for expanding terms which aren’t otherwise absolute IRIs
79 80 81 |
# File 'lib/json/ld/evaluation_context.rb', line 79 def vocab @vocab end |
Instance Method Details
#alias(value) ⇒ String
Reverse term mapping, typically used for finding aliases for keys.
Returns either the original value, or a mapping for this value.
389 390 391 |
# File 'lib/json/ld/evaluation_context.rb', line 389 def alias(value) iri_to_term.fetch(value, value) end |
#coerce(property) ⇒ RDF::URI, '@id'
Retrieve term coercion
399 400 401 402 403 404 |
# File 'lib/json/ld/evaluation_context.rb', line 399 def coerce(property) # Map property, if it's not an RDF::Value # @type and @graph always is an IRI return '@id' if [RDF.type, '@type', '@graph'].include?(property) @coercions.fetch(property, nil) end |
#compact_iri(iri, options = {}) ⇒ String
Compact an IRI
524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 |
# File 'lib/json/ld/evaluation_context.rb', line 524 def compact_iri(iri, = {}) depth() do debug {"compact_iri(#{iri.inspect}, #{.inspect})"} value = .fetch(:value, nil) # Get a list of terms which map to iri matched_terms = mappings.keys.select {|t| mapping(t).to_s == iri} debug("compact_iri", "initial terms: #{matched_terms.inspect}") # Create an empty list of terms _terms_ that will be populated with terms that are ranked according to how closely they match value. Initialize highest rank to 0, and set a flag list container to false. terms = {} # If value is a @list add a term rank for each # term mapping to iri which has @container @list. debug("compact_iri", "#{value.inspect} is a list? #{list?(value).inspect}") if list?(value) list_terms = matched_terms.select {|t| container(t) == '@list'} terms = list_terms.inject({}) do |memo, t| memo[t] = term_rank(t, value) memo end unless list_terms.empty? debug("term map") {"remove zero rank terms: #{terms.keys.select {|t| terms[t] == 0}}"} if terms.any? {|t,r| r == 0} terms.delete_if {|t, r| r == 0} end # Otherwise, value is @value or a native type. # Add a term rank for each term mapping to iri # which does not have @container @list if terms.empty? non_list_terms = matched_terms.reject {|t| container(t) == '@list'} # If value is a @list, exclude from term map those terms # with @container @set non_list_terms.reject {|t| container(t) == '@set'} if list?(value) terms = non_list_terms.inject({}) do |memo, t| memo[t] = term_rank(t, value) memo end unless non_list_terms.empty? debug("term map") {"remove zero rank terms: #{terms.keys.select {|t| terms[t] == 0}}"} if terms.any? {|t,r| r == 0} terms.delete_if {|t, r| r == 0} end # If we don't want terms, remove anything that's not a CURIE or IRI terms.keep_if {|t, v| t.index(':') } if .fetch(:not_term, false) # Find terms having the greatest term match value least_distance = terms.values.max terms = terms.keys.select {|t| terms[t] == least_distance} # If terms is empty, and the active context has a @vocab which is a prefix of iri where the resulting relative IRI is not a term in the active context. The resulting relative IRI is the unmatched part of iri. if vocab && terms.empty? && iri.to_s.index(vocab) == 0 && [:predicate, :type].include?([:position]) terms << iri.to_s.sub(vocab, '') debug("vocab") {"vocab: #{vocab}, rel: #{terms.first}"} end # If terms is empty, add a compact IRI representation of iri for each # term in the active context which maps to an IRI which is a prefix for # iri where the resulting compact IRI is not a term in the active # context. The resulting compact IRI is the term associated with the # partially matched IRI in the active context concatenated with a colon # (:) character and the unmatched part of iri. if terms.empty? debug("curies") {"mappings: #{mappings.inspect}"} curies = mappings.keys.map do |k| debug("curies[#{k}]") {"#{mapping(k).inspect}"} #debug("curies[#{k}]") {"#{(mapping(k).to_s.length > 0).inspect}, #{iri.to_s.index(mapping(k).to_s)}"} iri.to_s.sub(mapping(k).to_s, "#{k}:") if mapping(k).to_s.length > 0 && iri.to_s.index(mapping(k).to_s) == 0 && iri.to_s != mapping(k).to_s end.compact debug("curies") do curies.map do |c| "#{c}: " + "container: #{container(c).inspect}, " + "coerce: #{coerce(c).inspect}, " + "lang: #{language(c).inspect}" end.inspect end terms = curies.select do |curie| ([:position] != :predicate || container(curie) != '@list') && coerce(curie).nil? && language(curie) == default_language end debug("curies") {"selected #{terms.inspect}"} end # If we still don't have any terms and we're using standard_prefixes, # try those, and add to mapping if terms.empty? && @options[:standard_prefixes] terms = RDF::Vocabulary. select {|v| iri.index(v.to_uri.to_s) == 0}. map do |v| prefix = v.__name__.to_s.split('::').last.downcase set_mapping(prefix, v.to_uri.to_s) iri.sub(v.to_uri.to_s, "#{prefix}:").sub(/:$/, '') end debug("curies") {"using standard prefies: #{terms.inspect}"} end if terms.empty? # If there is a mapping from the complete IRI to null, return null, # otherwise, return the complete IRI. if mappings.has_key?(iri.to_s) && !mapping(iri) debug("iri") {"use nil IRI mapping"} terms << nil else terms << iri.to_s end end # Get the first term based on distance and lexecographical order # Prefer terms that don't have @container @set over other terms, unless as set is true terms = terms.sort do |a, b| debug("term sort") {"c(a): #{container(a).inspect}, c(b): #{container(b)}"} if a.to_s.length == b.to_s.length a.to_s <=> b.to_s else a.to_s.length <=> b.to_s.length end end debug("sorted terms") {terms.inspect} result = terms.first debug {"=> #{result.inspect}"} result end end |
#compact_value(property, value, options = {}) ⇒ Hash
Compact a value
FIXME: revisit the specification version of this.
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 |
# File 'lib/json/ld/evaluation_context.rb', line 787 def compact_value(property, value, = {}) raise ProcessingError::Lossy, "attempt to compact a non-object value: #{value.inspect}" unless value.is_a?(Hash) depth() do debug("compact_value") {"property: #{property.inspect}, value: #{value.inspect}, coerce: #{coerce(property).inspect}"} result = case #when %w(boolean integer double).any? {|t| expand_iri(value['@type'], :position => :type) == RDF::XSD[t]} # # Compact native type # debug {" (native)"} # l = RDF::Literal(value['@value'], :datatype => expand_iri(value['@type'], :position => :type)) # l.canonicalize.object when coerce(property) == '@id' && value.has_key?('@id') # Compact an @id coercion debug {" (@id & coerce)"} compact_iri(value['@id'], :position => :subject) when value['@type'] && (value['@type'], :position => :type) == coerce(property) # Compact common datatype debug {" (@type & coerce) == #{coerce(property)}"} value['@value'] when value.has_key?('@id') # Compact an IRI value[self.alias('@id')] = compact_iri(value['@id'], :position => :subject) debug {" (#{self.alias('@id')} => #{value['@id']})"} value when value['@language'] && value['@language'] == language(property) # Compact language debug {" (@language) == #{language(property).inspect}"} value['@value'] when value['@value'] && !value['@value'].is_a?(String) # Compact simple literal to string debug {" (@value not string)"} value['@value'] when value['@value'] && !value['@language'] && !value['@type'] && !coerce(property) && !default_language # Compact simple literal to string debug {" (@value && !@language && !@type && !coerce && !language)"} value['@value'] when value['@value'] && !value['@language'] && !value['@type'] && !coerce(property) && !language(property) # Compact simple literal to string debug {" (@value && !@language && !@type && !coerce && language(property).false)"} value['@value'] when value['@type'] # Compact datatype debug {" (@type)"} value[self.alias('@type')] = compact_iri(value['@type'], :position => :type) value else # Otherwise, use original value debug {" (no change)"} value end # If the result is an object, tranform keys using any term keyword aliases if result.is_a?(Hash) && result.keys.any? {|k| self.alias(k) != k} debug {" (map to key aliases)"} new_element = {} result.each do |k, v| new_element[self.alias(k)] = v end result = new_element end debug {"=> #{result.inspect}"} result end end |
#container(property) ⇒ String
Retrieve container mapping, add it if ‘value` is provided
427 428 429 |
# File 'lib/json/ld/evaluation_context.rb', line 427 def container(property) @containers.fetch(property.to_s, nil) end |
#dup ⇒ Object
864 865 866 867 868 869 870 871 872 873 874 875 876 |
# File 'lib/json/ld/evaluation_context.rb', line 864 def dup # Also duplicate mappings, coerce and list ec = super ec.mappings = mappings.dup ec.coercions = coercions.dup ec.containers = containers.dup ec.languages = languages.dup ec.default_language = default_language ec. = ec.iri_to_term = iri_to_term.dup ec.iri_to_curie = iri_to_curie.dup ec end |
#expand_iri(iri, options = {}) ⇒ RDF::URI, String
Expand an IRI. Relative IRIs are expanded against any document base.
489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 |
# File 'lib/json/ld/evaluation_context.rb', line 489 def (iri, = {}) return iri unless iri.is_a?(String) prefix, suffix = iri.split(':', 2) return mapping(iri) if mapping(iri) # If it's an exact match debug("expand_iri") {"prefix: #{prefix.inspect}, suffix: #{suffix.inspect}, vocab: #{vocab.inspect}"} unless [:quiet] base = [:subject].include?([:position]) ? .fetch(:base, self.base) : nil prefix = prefix.to_s case when prefix == '_' && suffix then bnode(suffix) when iri.to_s[0,1] == "@" then iri when suffix.to_s[0,2] == '//' then uri(iri) when mappings.fetch(prefix, false) then uri(mappings[prefix] + suffix.to_s) when base then base.join(iri) when vocab then uri("#{vocab}#{iri}") else # Otherwise, it must be an absolute IRI u = uri(iri) u if u.absolute? || [:subject].include?([:position]) end end |
#expand_value(property, value, options = {}) ⇒ Hash
Expand a value from compacted to expanded form making the context unnecessary. This method is used as part of more general expansion and operates on RHS values, using a supplied key to determine @type and @container coercion rules.
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 |
# File 'lib/json/ld/evaluation_context.rb', line 676 def (property, value, = {}) = {:useNativeTypes => true}.merge() depth() do debug("expand_value") {"property: #{property.inspect}, value: #{value.inspect}, coerce: #{coerce(property).inspect}"} value = RDF::Literal(value) if RDF::Literal(value).has_datatype? dt = case value when RDF::Literal case value.datatype when RDF::XSD.boolean, RDF::XSD.integer, RDF::XSD.double then value.datatype else value end when RDF::Term then value.class.name else value end result = case dt when RDF::XSD.boolean debug("xsd:boolean") case coerce(property) when RDF::XSD.double.to_s {"@value" => value.to_s, "@type" => RDF::XSD.double.to_s} else if [:useNativeTypes] # Unless there's coercion, to not modify representation {"@value" => (value.is_a?(RDF::Literal::Boolean) ? value.object : value)} else {"@value" => value.to_s, "@type" => RDF::XSD.boolean.to_s} end end when RDF::XSD.integer debug("xsd:integer") case coerce(property) when RDF::XSD.double.to_s {"@value" => RDF::Literal::Double.new(value, :canonicalize => true).to_s, "@type" => RDF::XSD.double.to_s} when RDF::XSD.integer.to_s, nil # Unless there's coercion, to not modify representation if [:useNativeTypes] {"@value" => value.is_a?(RDF::Literal::Integer) ? value.object : value} else {"@value" => value.to_s, "@type" => RDF::XSD.integer.to_s} end else res = Hash.ordered res['@value'] = value.to_s res['@type'] = coerce(property) res end when RDF::XSD.double debug("xsd:double") case coerce(property) when RDF::XSD.integer.to_s {"@value" => value.to_int.to_s, "@type" => RDF::XSD.integer.to_s} when RDF::XSD.double.to_s {"@value" => RDF::Literal::Double.new(value, :canonicalize => true).to_s, "@type" => RDF::XSD.double.to_s} when nil if [:useNativeTypes] # Unless there's coercion, to not modify representation {"@value" => value.is_a?(RDF::Literal::Double) ? value.object : value} else {"@value" => RDF::Literal::Double.new(value, :canonicalize => true).to_s, "@type" => RDF::XSD.double.to_s} end else res = Hash.ordered res['@value'] = value.to_s res['@type'] = coerce(property) res end when "RDF::URI", "RDF::Node" debug("URI | BNode") { value.to_s } {'@id' => value.to_s} when RDF::Literal debug("Literal") res = Hash.ordered res['@value'] = value.to_s res['@type'] = value.datatype.to_s if value.has_datatype? res['@language'] = value.language.to_s if value.has_language? res else debug("else") case coerce(property) when '@id' {'@id' => (value, :position => :subject).to_s} when nil debug("expand value") {"lang(prop): #{language(property).inspect}, def: #{default_language.inspect}"} language(property) ? {"@value" => value.to_s, "@language" => language(property)} : {"@value" => value.to_s} else res = Hash.ordered res['@value'] = value.to_s res['@type'] = coerce(property).to_s res end end debug {"=> #{result.inspect}"} result end end |
#inspect ⇒ Object
854 855 856 857 858 859 860 861 862 |
# File 'lib/json/ld/evaluation_context.rb', line 854 def inspect v = %w([EvaluationContext) v << "def_language=#{default_language}" v << "languages[#{languages.keys.length}]=#{languages}" v << "mappings[#{mappings.keys.length}]=#{mappings}" v << "coercions[#{coercions.keys.length}]=#{coercions}" v << "containers[#{containers.length}]=#{containers}" v.join(", ") + "]" end |
#language(property) ⇒ String
Retrieve the language associated with a property, or the default language otherwise
450 451 452 |
# File 'lib/json/ld/evaluation_context.rb', line 450 def language(property) @languages.fetch(property.to_s, @default_language) if !coerce(property) end |
#mapping(term) ⇒ RDF::URI, String
Retrieve term mapping
356 357 358 |
# File 'lib/json/ld/evaluation_context.rb', line 356 def mapping(term) @mappings.fetch(term.to_s, nil) end |
#parse(context) ⇒ Object
Create an Evaluation Context using an existing context as a start by parsing the input.
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 |
# File 'lib/json/ld/evaluation_context.rb', line 122 def parse(context) case context when nil EvaluationContext.new when EvaluationContext debug("parse") {"context: #{context.inspect}"} context.dup when IO, StringIO debug("parse") {"io: #{context}"} # Load context document, if it is a string begin ctx = JSON.load(context) parse(ctx["@context"] || {}) rescue JSON::ParserError => e debug("parse") {"Failed to parse @context from remote document at #{context}: #{e.}"} raise JSON::LD::InvalidContext::Syntax, "Failed to parse remote context at #{context}: #{e.}" if @options[:validate] self.dup end when nil debug("parse") {"nil"} # Load context document, if it is a string ec = EvaluationContext.new() when String debug("parse") {"remote: #{context}"} # Load context document, if it is a string ec = nil begin url = (context, :base => context_base || base, :position => :subject) ecdup = self.dup ecdup.context_base = url # Set context_base for recursive remote contexts RDF::Util::File.open_file(url) {|f| ec = ecdup.parse(f)} ec.provided_context = context ec.context_base = url debug("parse") {"=> provided_context: #{context.inspect}"} ec rescue Exception => e debug("parse") {"Failed to retrieve @context from remote document at #{context.inspect}: #{e.}"} raise JSON::LD::InvalidContext::LoadError, "Failed to retrieve remote context at #{context.inspect}: #{e.}", e.backtrace if @options[:validate] self.dup end when Array # Process each member of the array in order, updating the active context # Updates evaluation context serially during parsing debug("parse") {"Array"} ec = self context.each {|c| ec = ec.parse(c)} ec.provided_context = context debug("parse") {"=> provided_context: #{context.inspect}"} ec when Hash new_ec = self.dup new_ec.provided_context = context.dup { '@language' => :default_language=, '@vocab' => :vocab= }.each do |key, setter| v = context.fetch(key, false) if v.nil? || v.is_a?(String) context.delete(key) debug("parse") {"Set #{key} to #{v.inspect}"} new_ec.send(setter, v) elsif v raise InvalidContext::Syntax, "#{key.inspect} is invalid" end end num_updates = 1 while num_updates > 0 do num_updates = 0 # Map terms to IRIs/keywords first context.each do |key, value| # Expand a string value, unless it matches a keyword debug("parse") {"Hash[#{key}] = #{value.inspect}"} if KEYWORDS.include?(key) raise InvalidContext::Syntax, "key #{key.inspect} must not be a keyword" elsif term_valid?(key) # Remove all coercion information for the property new_ec.set_coerce(key, nil) new_ec.set_container(key, nil) @languages.delete(key) # Extract IRI mapping. This is complicated, as @id may have been aliased value = value.fetch('@id', nil) if value.is_a?(Hash) raise InvalidContext::Syntax, "unknown mapping for #{key.inspect} to #{value.class}" unless value.is_a?(String) || value.nil? iri = new_ec.(value, :position => :predicate) if value.is_a?(String) if iri && new_ec.mappings.fetch(key, nil) != iri # Record term definition new_ec.set_mapping(key, iri) num_updates += 1 elsif value.nil? new_ec.set_mapping(key, nil) end else raise InvalidContext::Syntax, "key #{key.inspect} is invalid" end end end # Next, look for coercion using new_ec context.each do |key, value| # Expand a string value, unless it matches a keyword debug("parse") {"coercion/list: Hash[#{key}] = #{value.inspect}"} case value when Hash # Must have one of @id, @language, @type or @container raise InvalidContext::Syntax, "mapping for #{key.inspect} missing one of @id, @language, @type or @container" if (%w(@id @language @type @container) & value.keys).empty? value.each do |key2, value2| iri = new_ec.(value2, :position => :predicate) if value2.is_a?(String) case key2 when '@type' raise InvalidContext::Syntax, "unknown mapping for '@type' to #{value2.class}" unless value2.is_a?(String) || value2.nil? if new_ec.coerce(key) != iri raise InvalidContext::Syntax, "unknown mapping for '@type' to #{iri.inspect}" unless RDF::URI(iri).absolute? || iri == '@id' # Record term coercion new_ec.set_coerce(key, iri) end when '@container' raise InvalidContext::Syntax, "unknown mapping for '@container' to #{value2.class}" unless %w(@list @set).include?(value2) if new_ec.container(key) != value2 debug("parse") {"container #{key.inspect} as #{value2.inspect}"} new_ec.set_container(key, value2) end when '@language' if !new_ec.languages.has_key?(key) || new_ec.languages[key] != value2 debug("parse") {"language #{key.inspect} as #{value2.inspect}"} new_ec.set_language(key, value2) end end end # If value has no @id, create a mapping from key # to the expanded key IRI unless value.has_key?('@id') iri = new_ec.(key, :position => :predicate) new_ec.set_mapping(key, iri) end when nil, String # handled in previous loop else raise InvalidContext::Syntax, "attempt to map #{key.inspect} to #{value.class}" end end new_ec end end |
#serialize(options = {}) ⇒ Hash
Generate @context
If a context was supplied in global options, use that, otherwise, generate one from this representation.
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 |
# File 'lib/json/ld/evaluation_context.rb', line 281 def serialize( = {}) depth() do use_context = if provided_context debug "serlialize: reuse context: #{provided_context.inspect}" provided_context else debug("serlialize: generate context") debug {"=> context: #{inspect}"} ctx = Hash.ordered ctx['@language'] = default_language.to_s if default_language ctx['@vocab'] = vocab.to_s if vocab # Mappings mappings.keys.sort{|a, b| a.to_s <=> b.to_s}.each do |k| next unless term_valid?(k.to_s) debug {"=> mappings[#{k}] => #{mappings[k]}"} ctx[k] = mappings[k].to_s end unless coercions.empty? && containers.empty? && languages.empty? # Coerce (coercions.keys + containers.keys + languages.keys).uniq.sort.each do |k| next if k == '@type' # Turn into long form ctx[k] ||= Hash.ordered if ctx[k].is_a?(String) defn = Hash.ordered defn["@id"] = compact_iri(ctx[k], :position => :subject, :not_term => true) ctx[k] = defn end debug {"=> coerce(#{k}) => #{coerce(k)}"} if coerce(k) && !NATIVE_DATATYPES.include?(coerce(k)) dt = coerce(k) dt = compact_iri(dt, :position => :type) unless dt == '@id' # Fold into existing definition ctx[k]["@type"] = dt debug {"=> datatype[#{k}] => #{dt}"} end debug {"=> container(#{k}) => #{container(k)}"} if %w(@list @set).include?(container(k)) ctx[k]["@container"] = container(k) debug {"=> container[#{k}] => #{container(k).inspect}"} end debug {"=> language(#{k}) => #{language(k)}"} if language(k) != default_language ctx[k]["@language"] = language(k) ? language(k) : nil debug {"=> language[#{k}] => #{language(k).inspect}"} end # Remove an empty definition ctx.delete(k) if ctx[k].empty? end end debug {"start_doc: context=#{ctx.inspect}"} ctx end # Return hash with @context, or empty r = Hash.ordered r['@context'] = use_context unless use_context.nil? || use_context.empty? r end end |
#set_coerce(property, value) ⇒ RDF::URI, '@id'
Set term coercion
413 414 415 416 417 418 419 420 |
# File 'lib/json/ld/evaluation_context.rb', line 413 def set_coerce(property, value) debug {"coerce #{property.inspect} to #{value.inspect}"} unless @coercions[property.to_s] == value if value @coercions[property] = value else @coercions.delete(property) end end |
#set_container(property, value) ⇒ Boolean
Set container mapping
437 438 439 440 441 442 443 444 445 |
# File 'lib/json/ld/evaluation_context.rb', line 437 def set_container(property, value) return if @containers[property.to_s] == value debug {"coerce #{property.inspect} to #{value.inspect}"} if value @containers[property.to_s] = value else @containers.delete(value) end end |
#set_language(property, value) ⇒ String
Set language mapping
460 461 462 463 |
# File 'lib/json/ld/evaluation_context.rb', line 460 def set_language(property, value) # Use false for nil language @languages[property.to_s] = value ? value : false end |
#set_mapping(term, value) ⇒ RDF::URI, String
Set term mapping
367 368 369 370 371 372 373 374 375 376 377 |
# File 'lib/json/ld/evaluation_context.rb', line 367 def set_mapping(term, value) term = term.to_s term_sym = term.empty? ? "" : term.to_sym # raise InvalidContext::Syntax, "mapping term #{term.inspect} must be a string" unless term.is_a?(String) # raise InvalidContext::Syntax, "mapping value #{value.inspect} must be an RDF::URI" unless value.nil? || value.to_s[0,1] == '@' || value.is_a?(RDF::URI) debug {"map #{term.inspect} to #{value.inspect}"} iri_to_term.delete(@mappings[term].to_s) if @mappings[term] @mappings[term] = value @options[:prefixes][term_sym] = value if @options.has_key?(:prefixes) iri_to_term[value.to_s] = term end |
#term_valid?(term) ⇒ Boolean
Determine if ‘term` is a suitable term. Term may be any valid JSON string.
471 472 473 |
# File 'lib/json/ld/evaluation_context.rb', line 471 def term_valid?(term) term.is_a?(String) end |