Generic features of an orthographic system

The GreekOrthography abstract type is a subtype of OrthographicSystem. Concrete implementations of GreekOrthography are therefore also implementations of an OrthographicSystem. In the following code blocks, you can see that LiteraryGreekOrthography inherits from OrthographicSystem via GreekOrthography, and can be used like any other OrthographicSystem to assess the validity of characters and strings, and analyze strings of characters as sequences of classified tokens.

using PolytonicGreek
lg = literaryGreek()
typeof(lg)

LiteraryGreekOrthography

typeof(lg) |> supertype

GreekOrthography

typeof(lg) |> supertype |> supertype

Orthography.OrthographicSystem

Assessing characters and strings

using Orthography
omicron = "ο"
validcp(omicron, lg)

true

latinO = "o"
validcp(latinO, lg)

false

greek = "μῆνιν ἄειδε"
validstring(greek, lg)

true

notgreek = "μῆνιν?"
validstring(notgreek, lg)

false

Tokenizing strings

Subtypes of Orthography.OrthographicSystem include a tokenizer function that analyzes a string encoded in this orthographic system into an Array of OrthographicTokens, which are classified string values. For example, the string μῆνιν ἄειδε, is analyzed as three tokens, two of type LexicalToken, and one of type PunctuationToken

tokenized = tokenize("μῆνιν ἄειδε,", lg)
length(tokenized)

3

tokenized[1].text

"μῆνιν"

tokenized[1].tokencategory

Orthography.LexicalToken()

tokenized[end].text

","

tokenized[end].tokencategory

Orthography.PunctuationToken()