0470f8e603
This is an evolution of the old tools/defs/types.go file which essentially had these data structs manually defined in a static go file. Now, the parser should be able to construct this data structure on the fly from input files and reference files.
100 行
2.7 KiB
Go
100 行
2.7 KiB
Go
package rdf
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import (
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"fmt"
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)
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const (
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JSON_LD_CONTEXT = "@context"
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)
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// JSONLD is an alias for the generic map of keys to interfaces, presumably
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// parsed from a JSON-encoded context definition file.
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type JSONLD map[string]interface{}
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// RDFNode is able to operate on a specific key if it applies towards its
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// ontology (determined at creation time). It applies the value in its own
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// specific implementation on the context.
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type RDFNode interface {
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Apply(key string, value interface{}, ctx ParseContext) (bool, error)
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}
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// ParseJSONLDContext implements a super basic JSON-LD @context parsing
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// algorithm in order to build a tree that can parse the rest of the document.
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func ParseJSONLDContext(registry *RDFRegistry, input JSONLD) (nodes []RDFNode, err error) {
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i, ok := input[JSON_LD_CONTEXT]
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if !ok {
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err = fmt.Errorf("no @context in input")
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return
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}
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if inArray, ok := i.([]interface{}); ok {
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// @context is an array
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for _, iVal := range inArray {
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if valMap, ok := iVal.(map[string]interface{}); ok {
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// Element is a JSON Object (dictionary)
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for alias, val := range valMap {
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if s, ok := val.(string); ok {
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var n []RDFNode
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n, err = registry.getAliased(alias, s)
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if err != nil {
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return
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}
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nodes = append(nodes, n...)
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} else if aliasedMap, ok := val.(map[string]interface{}); ok {
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var n []RDFNode
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n, err = registry.getAliasedObject(alias, aliasedMap)
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if err != nil {
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return
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}
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nodes = append(nodes, n...)
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} else {
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err = fmt.Errorf("@context value in dict in array is neither a dict nor a string")
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return
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}
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}
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} else if s, ok := iVal.(string); ok {
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// Element is a single value
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var n []RDFNode
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n, err = registry.getFor(s)
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if err != nil {
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return
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}
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nodes = append(nodes, n...)
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} else {
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err = fmt.Errorf("@context value in array is neither a dict nor a string")
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return
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}
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}
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} else if inMap, ok := i.(map[string]interface{}); ok {
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// @context is a JSON object (dictionary)
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for alias, iVal := range inMap {
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if s, ok := iVal.(string); ok {
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var n []RDFNode
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n, err = registry.getAliased(alias, s)
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if err != nil {
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return
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}
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nodes = append(nodes, n...)
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} else if aliasedMap, ok := iVal.(map[string]interface{}); ok {
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var n []RDFNode
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n, err = registry.getAliasedObject(alias, aliasedMap)
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if err != nil {
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return
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}
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nodes = append(nodes, n...)
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} else {
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err = fmt.Errorf("@context value in dict is neither a dict nor a string")
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return
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}
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}
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} else {
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// @context is a single value
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s, ok := i.(string)
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if !ok {
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err = fmt.Errorf("single @context value is not a string")
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}
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return registry.getFor(s)
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}
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return
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}
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