41 lines
1.7 KiB
Go
41 lines
1.7 KiB
Go
package tokenize
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// TokenHandler is the function type that is involved in turning a low level
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// stream of UTF8 runes into lexical tokens. Its purpose is to check if input
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// data matches some kind of pattern and to report back the results.
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//
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// A TokenHandler function gets a TokenAPI as its input and returns a boolean to
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// indicate whether or not it found a match on the input. The TokenAPI is used
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// for retrieving input data to match against and for reporting back results.
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type TokenHandler func(t *TokenAPI) bool
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// Or is syntactic sugar that allows you to write a construction like
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// MatchAny(tokenHandler1, tokenHandler2) as tokenHandler1.Or(tokenHandler2).
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func (handler TokenHandler) Or(otherHandler TokenHandler) TokenHandler {
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return MatchAny(handler, otherHandler)
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}
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// Times is syntactic sugar that allows you to write a construction like
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// MatchRep(3, handler) as handler.Times(3).
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func (handler TokenHandler) Times(n int) TokenHandler {
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return MatchRep(n, handler)
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}
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// Then is syntactic sugar that allows you to write a construction like
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// MatchSeq(handler1, handler2, handler3) as handler1.Then(handler2).Then(handler3).
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func (handler TokenHandler) Then(otherHandler TokenHandler) TokenHandler {
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return MatchSeq(handler, otherHandler)
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}
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// SeparatedBy is syntactic sugar that allows you to write a construction like
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// MatchSeparated(handler, separator) as handler.SeparatedBy(separator).
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func (handler TokenHandler) SeparatedBy(separatorHandler TokenHandler) TokenHandler {
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return MatchSeparated(separatorHandler, handler)
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}
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// Optional is syntactic sugar that allows you to write a construction like
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// MatchOpt(handler) as handler.Optional().
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func (handler TokenHandler) Optional() TokenHandler {
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return MatchOpt(handler)
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}
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