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Informations about the package printf-state-machine

Printf State Machine

Generate HH\FormatString<T> state machines.

This package uses a code generator to create state machines that process HH\FormatString<T> with their arguments and the accompanying typesafety interfaces. This is a --dev dependency. You don't need this generator in production to use the state machines.

Usage

You can chain together your own format string DSL in little to no time. Start with PrintfStateMachine\Factory::create() and chain ->with... methods. Once your DSL is ready, invoke |> PrintfStateMachine\codegen($$, PrintfStateMachine\ENGINE_TEMPLATE). You will get Entities, which are "just code". Put this code somewhere in a namespace it won't conflict with any other engines. Then create a typesafe caller.

This will transform your format and arguments according to the rules you've set out in your factory.

Use case

HH\Lib\SQL\Query has support for these specifiers:

Specifier Effect
%d %f %s nullable int, float, and string
%=d %=f %=s equality for int, float, and string
%C %T column and table names
%Ld %Lf %Ls %LC list of int, float, string, and column
%K /* comments */
%Q nested Query objects

You may very well want to add a strongly typed %N for TableAndColumnName to make sure that you never accidentally switch around a column name and a user supplied value. Short of patching the Hack typechecker, or building a very difficult to write linter that depends on type information, you'd need a tool like this. Write a definition for 12 (excluding %C and %T) specifiers and add ->withRewrite<TableAndColumnName>('N', 'C'). The format and args were typechecked by Hack.

A library will be published with these implementations.

All versions of printf-state-machine with dependencies

PHP Build Version
Package Version
Requires hhvm Version >=4.153
hershel-theodore-layton/hhvm-four-shim Version <1
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