F-Flat

F♭ (pronounced F-flat) is a toy language.

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Converts a stack item to a “function” definition

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Internal Vocabulary Words

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defer

Stores a value in the dictionary that raises an error when executed. Used to allocate a word before it is used, for example in mutually-recursive

a: ->

f♭> a: defer
[ ]

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; (def)

stores a definition in the current dictionary

a: [A] ->

f♭> sqr: [ dup * ] ;
[ ]

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use

Move the contents of a map into scope

• The map must be a map of keys to global symbols generated by vocab

{A} ->

f♭> { ... } use
[ ]

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vocab

Write the current local vocabulary to the stack

• The returned value is a map of strings (keys) to global symbols

-> {A}

f♭> vocab
[ { ... } ]

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defined?

returns true if the word is defined in the current vocabulary

a: -> bool

f♭> 'sqr' defined?
[ true ]

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see

recalls the definition of a word as a string

a: -> str

f♭> 'sqr' see
[ '[ dup * ]' ]

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show

prints the definition of a word as a formatted string

a: ->

f♭> "sqr" show
[ dup * ]
[ ]

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words

-> [str*]

returns a list of defined words

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locals

-> [str*]

returns a list of locals words

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scoped

-> [str*]

returns a list of local scoped words

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rewrite

{A} [B] -> [C]

rewrites an expression using a set of rewrite rules

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