97 lines
2 KiB
Go
97 lines
2 KiB
Go
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package longdistance
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// JSON-LD keywords.
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const (
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KeywordAny = "@any"
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KeywordBase = "@base"
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KeywordContainer = "@container"
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KeywordContext = "@context"
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KeywordDefault = "@default"
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KeywordDirection = "@direction"
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KeywordGraph = "@graph"
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KeywordID = "@id"
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KeywordImport = "@import"
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KeywordIncluded = "@included"
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KeywordIndex = "@index"
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KeywordJSON = "@json"
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KeywordLanguage = "@language"
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KeywordList = "@list"
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KeywordNest = "@nest"
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KeywordNone = "@none"
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KeywordNull = "@null"
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KeywordPrefix = "@prefix"
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KeywordPreserve = "@preserve"
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KeywordPropagate = "@propagate"
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KeywordProtected = "@protected"
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KeywordReverse = "@reverse"
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KeywordSet = "@set"
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KeywordType = "@type"
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KeywordValue = "@value"
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KeywordVersion = "@version"
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KeywordVocab = "@vocab"
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)
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// isKeyword returns if the string matches a known JSON-LD keyword.
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func isKeyword(s string) bool {
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switch s {
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case KeywordBase,
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KeywordContainer,
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KeywordContext,
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KeywordDefault,
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KeywordDirection,
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KeywordGraph,
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KeywordID,
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KeywordImport,
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KeywordIncluded,
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KeywordIndex,
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KeywordJSON,
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KeywordLanguage,
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KeywordList,
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KeywordNest,
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KeywordNone,
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KeywordPrefix,
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KeywordPreserve,
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KeywordPropagate,
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KeywordProtected,
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KeywordReverse,
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KeywordSet,
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KeywordType,
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KeywordValue,
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KeywordVersion,
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KeywordVocab:
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return true
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default:
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return false
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}
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}
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// looksLikeKeyword determines if a string has the general shape of a JSON-LD
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// keyword.
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//
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// It returns true for strings of the form: "@[alpha]".
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//
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// This means that a string like @blabla1 will return false, but it's still
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// strongly recommended against using those for keys just to avoid confusion.
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func looksLikeKeyword(s string) bool {
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if s == "" {
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return false
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}
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if s == "@" {
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return false
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}
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if s[0] != '@' {
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return false
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}
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for _, char := range s[1:] {
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if (char < 'a' || char > 'z') &&
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(char < 'A' || char > 'Z') {
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return false
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}
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}
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return true
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}
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