# `Unicode.String.Dfa.Builder`
[🔗](https://github.com/elixir-unicode/unicode_string/blob/v2.4.1/lib/unicode/string/dfa/builder.ex#L1)

Compile-time reader for the break-iterator state machine data proposed in
PRI #555 (L2/26-135).

Three files describe each break type:

    <Type>Symbols.txt      symbol name ; UnicodeSet ; non-dictionary equivalent
    <Type>States.txt       state name ; accepting ; lookahead ; break type
    <Type>Transitions.txt  from state ; symbol ; to state

Names are explicitly opaque in the proposal, so everything is reduced to
integer indices here and the names are kept only for diagnostics.

The proposal states that the symbols partition the code space. That is checked
while reading, so a bad data file becomes a compile error rather than a wrong
answer at run time.

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*Consult [api-reference.md](api-reference.md) for complete listing*