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(define-module (dump triples)
#:use-module (ice-9 regex)
#:use-module (ice-9 match)
#:use-module (dump strings)
#:export (ontology
string->identifier
prefix
triple
scm->triples
annotate-field))
(define (annotate-field field schema)
(let ([schema (cond ((symbol? schema)
(symbol->string schema))
((string? schema) schema)
(else
(error "Use a string/symbol")))]
[string-field (if (number? field) (number->string field) field)])
(if (string-null? string-field)
""
(string->symbol
(format #f "~s~a" string-field schema)))))
(define (string->identifier prefix str)
"Convert STR to a turtle identifier after replacing illegal
characters with an underscore and prefixing with gn:PREFIX."
(if (string-null? str)
""
(string->symbol
(string-append "gn:" prefix "_"
(string-map (lambda (c)
(case c
((#\/ #\< #\> #\+ #\( #\) #\space #\@) #\_)
(else c)))
(string-downcase
(string-trim-right str #\.)))))))
(define (prefix prefix iri)
(format #t "@prefix ~a ~a .~%" prefix iri))
(define (ontology prefix value)
(if (and (string? value) (string-null? value))
""
(string->symbol
`,(format #f "~a~a" prefix value))))
(define (triple subject predicate object)
(unless (or (string? subject)
(symbol? subject))
(error "Triple subject not a string or symbol:"
(list subject predicate object)))
(unless (or (string? predicate)
(symbol? predicate))
(error "Triple predicate not a string or symbol:"
(list subject predicate object)))
(unless (or (string? object)
(symbol? object)
(number? object))
(error "Triple object not a string, symbol or number:"
(list subject predicate object)))
(let ([pattern (match object
((or (? symbol? object)
(? (lambda (el) (string-match "^\\[ .* \\]$" el)) object))
"~a ~a ~a .~%")
(_ "~a ~a \"~a\" .~%"))])
(format #t pattern subject predicate
(if (symbol? object) (symbol->string object) object))))
(define (scm->triples alist id)
(for-each (match-lambda
((predicate . object)
(when (cond
((string? object)
(not (string-blank? object)))
(else object))
(triple id predicate object))))
alist))
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