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package bjc.utils.ioutils;
import java.util.function.BiConsumer;
import bjc.utils.exceptions.PragmaFormatException;
import bjc.utils.funcdata.FunctionalStringTokenizer;
import bjc.utils.funcutils.ListUtils;
/**
* Contains factory methods for common pragma types
*
* @author ben
*
*/
public class RuleBasedReaderPragmas {
/**
* Creates a pragma that takes a single integer argument
*
* @param <StateType>
* The type of state that goes along with this pragma
* @param name
* The name of this pragma, for error message purpose
* @param consumer
* The function to invoke with the parsed integer
* @return A pragma that functions as described above.
*/
public static <StateType> BiConsumer<FunctionalStringTokenizer, StateType> buildInteger(final String name,
final BiConsumer<Integer, StateType> consumer) {
return (tokenizer, state) -> {
/*
* Check our input is correct
*/
if (!tokenizer.hasMoreTokens()) {
String fmt = "Pragma %s requires one integer argument";
throw new PragmaFormatException(String.format(fmt, name));
}
/*
* Read the argument
*/
final String token = tokenizer.nextToken();
try {
/*
* Run the pragma
*/
consumer.accept(Integer.parseInt(token), state);
} catch (final NumberFormatException nfex) {
/*
* Tell the user their argument isn't correct
*/
String fmt = "Argument %s to %s pragma isn't a valid integer, and this pragma requires an integer argument.";
final PragmaFormatException pfex = new PragmaFormatException(String.format(fmt, token, name));
pfex.initCause(nfex);
throw pfex;
}
};
}
/**
* Creates a pragma that takes any number of arguments and collapses
* them all into a single string
*
* @param <StateType>
* The type of state that goes along with this pragma
* @param name
* The name of this pragma, for error message purpose
* @param consumer
* The function to invoke with the parsed string
* @return A pragma that functions as described above.
*/
public static <StateType> BiConsumer<FunctionalStringTokenizer, StateType> buildStringCollapser(
final String name, final BiConsumer<String, StateType> consumer) {
return (tokenizer, state) -> {
/*
* Check our input
*/
if (!tokenizer.hasMoreTokens()) {
String fmt = "Pragma %s requires one or more string arguments.";
throw new PragmaFormatException(String.format(fmt, name));
}
/*
* Build our argument
*/
final String collapsed = ListUtils.collapseTokens(tokenizer.toList());
/*
* Run the pragma
*/
consumer.accept(collapsed, state);
};
}
}
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