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context.go
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context.go
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package main
import (
"regexp"
"strconv"
"strings"
"github.com/iand/gordf"
)
var LabellingProperties = []rdf.Term{
rdf.IRI("http://www.w3.org/2004/02/skos/core#prefLabel"),
rdf.IRI("http://www.w3.org/2000/01/rdf-schema#label"),
rdf.IRI("http://purl.org/dc/terms/title"),
rdf.IRI("http://purl.org/dc/elements/1.1/title"),
rdf.IRI("http://xmlns.com/foaf/0.1/name"),
rdf.IRI("http://www.geonames.org/ontology#name"),
rdf.IRI("http://www.w3.org/1999/02/22-rdf-syntax-ns#value"),
rdf.IRI("http://purl.org/rss/1.0/title"),
}
var GeneralDescribingProperties = []rdf.Term{
rdf.IRI("http://purl.org/dc/terms/description"),
rdf.IRI("http://purl.org/dc/elements/1.1/description"),
rdf.IRI("http://www.w3.org/2000/01/rdf-schema#comment"),
rdf.IRI("http://purl.org/rss/1.0/description"),
rdf.IRI("http://purl.org/dc/terms/abstract"),
rdf.IRI("http://purl.org/vocab/bio/0.1/olb"),
rdf.IRI("http://www.w3.org/2004/02/skos/core#definition"),
}
var wordRegexp = regexp.MustCompile("(^[a-z]+)|([A-Z][^A-Z]+)")
type Context struct {
Term rdf.Term
Graph *Graph
Done map[rdf.Term]bool
}
func (c *Context) Objects(properties ...rdf.Term) []rdf.Term {
// TODO: use SPO index?
r := []rdf.Term{}
for _, t := range c.Graph.Triples {
if t.S == c.Term {
for _, p := range properties {
if t.P == p {
r = append(r, t.O)
}
}
}
}
return r
}
func (c *Context) Properties(includeDone bool) []rdf.Term {
// TODO: use OSP index?
seen := map[rdf.Term]struct{}{}
r := []rdf.Term{}
for _, t := range c.Graph.Triples {
if t.S == c.Term {
if _, exists := seen[t.P]; !exists {
if includeDone || c.Done == nil || !c.Done[t.P] {
seen[t.P] = struct{}{}
r = append(r, t.P)
}
}
}
}
return r
}
// Subjects returns a list of subjects that have the context Term as object of one of the supplied properties
func (c *Context) Subjects(properties ...rdf.Term) []rdf.Term {
// TODO: use POS index?
r := []rdf.Term{}
for _, t := range c.Graph.Triples {
if t.O == c.Term {
for _, p := range properties {
if t.P == p {
r = append(r, t.S)
}
}
}
}
return r
}
func (c *Context) New(t rdf.Term) *Context {
return &Context{
Term: t,
Graph: c.Graph,
Done: map[rdf.Term]bool{},
}
}
// Type returns true if there exists a triple with the term as a subject, rdf:type as a property and one of the
// classes as an object
// i.e. matches { T, rdf:type, class }
func (c *Context) Type(classes ...rdf.Term) bool {
for _, cl := range classes {
if c.Graph.Exists(c.Term, rdf.IRI("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), cl) {
return true
}
}
return false
}
// Object returns true if there exists a triple with the term as a subject, one of the properties and an object
// i.e. matches { T, p, ? }
// it is true if Objects returns a non-zero length slice
func (c *Context) Object(properties ...rdf.Term) bool {
for _, t := range c.Graph.Triples {
if t.S == c.Term {
for _, p := range properties {
if t.P == p {
return true
}
}
}
}
return false
}
// Subject returns true if there exists a triple with a subject, one of the properties and the Term as the object
// i.e. matches { ?, p, T }
// it is true if Subjects returns a non-zero length slice
func (c *Context) Subject(properties ...rdf.Term) bool {
for _, t := range c.Graph.Triples {
if t.O == c.Term {
for _, p := range properties {
if t.P == p {
return true
}
}
}
}
return false
}
func (c *Context) FirstLiteral(p rdf.Term, languages ...string) (rdf.Term, bool) {
for _, t := range c.Graph.Triples {
if t.S == c.Term && t.P == p && rdf.IsLiteral(t.O) {
if len(languages) == 0 {
return t.O, true
}
for _, l := range languages {
if t.O.Language == l {
return t.O, true
}
}
}
}
return rdf.Literal(""), false
}
func (c *Context) FirstIRI(p rdf.Term) (rdf.Term, bool) {
for _, t := range c.Graph.Triples {
if t.S == c.Term && t.P == p && rdf.IsIRI(t.O) {
return t.O, true
}
}
return rdf.IRI(""), false
}
func (c *Context) FirstObject(p rdf.Term) (rdf.Term, bool) {
for _, t := range c.Graph.Triples {
if t.S == c.Term && t.P == p {
return t.O, true
}
}
return rdf.IRI(""), false
}
func (c *Context) Label(capitalize bool, useQnames bool) string {
if rdf.IsLiteral(c.Term) {
value := c.Term.Value
if capitalize {
return ucfirst(value)
}
return value
}
for _, p := range LabellingProperties {
if l, exists := c.FirstLiteral(p, "", "en"); exists {
if capitalize {
return ucfirst(l.Value)
}
return l.Value
}
}
if ld, exists := labels[c.Term]; exists {
if capitalize {
return ucfirst(ld.singular)
}
return ld.singular
}
if num, ok := rdfListItem(c.Term); ok {
if capitalize {
return "Item " + strconv.Itoa(num)
}
return "item " + strconv.Itoa(num)
}
ns, local := splitIRI(c.Term)
if local != "" {
if useQnames {
prefix := getPrefix(ns)
return prefix + ":" + local
}
matches := wordRegexp.FindAllStringSubmatch(local, -1)
if len(matches) > 0 {
if matches[0][1] == "has" {
matches = matches[1:]
}
words := []string{}
for _, match := range matches {
words = append(words, strings.ToLower(match[1]))
}
label := strings.Join(words, " ")
if capitalize {
return ucfirst(label)
}
return label
} else {
if capitalize {
return ucfirst(local)
}
return local
}
}
if capitalize {
return ucfirst(c.Term.Value)
}
return c.Term.Value
}
func (c *Context) PluralLabel(capitalize bool, useQnames bool) string {
if l, exists := c.FirstLiteral(rdf.IRI("http://purl.org/net/vocab/2004/03/label#plural"), "", "en"); exists {
if capitalize {
return ucfirst(l.Value)
}
return l.Value
}
if ld, exists := labels[c.Term]; exists {
if capitalize {
return ucfirst(ld.plural)
}
return ld.singular
}
label := c.Label(capitalize, useQnames)
if strings.HasSuffix(label, "ss") {
return label + "es"
}
if strings.HasSuffix(label, "s") {
return label
}
if strings.HasSuffix(label, "y") {
return label[:len(label)-1] + "ies"
}
return label + "s"
}
func (c *Context) Description() string {
for _, p := range GeneralDescribingProperties {
if d, exists := c.FirstLiteral(p, "", "en"); exists {
return d.Value
}
}
return ""
}
func (c *Context) SetDone(properties ...rdf.Term) {
for _, p := range properties {
c.Done[p] = true
}
}