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package bjc.utils.ioutils;
import bjc.utils.exceptions.PragmaFormatException;
import bjc.utils.funcdata.FunctionalStringTokenizer;
import bjc.utils.funcutils.ListUtils;
import java.util.function.BiConsumer;
/**
* 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(String name,
BiConsumer<Integer, StateType> consumer) {
return (tokenizer, state) -> {
// Check our input is correct
if(!tokenizer.hasMoreTokens())
throw new PragmaFormatException("Pragma " + name + " requires one integer argument");
// Read the argument
String token = tokenizer.nextToken();
try {
// Run the pragma
consumer.accept(Integer.parseInt(token), state);
} catch(NumberFormatException nfex) {
// Tell the user their argument isn't correct
PragmaFormatException pfex = new PragmaFormatException(
"Argument " + token + " to " + name + " pragma isn't a valid integer. "
+ "This pragma requires a integer argument");
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(String name,
BiConsumer<String, StateType> consumer) {
return (tokenizer, state) -> {
// Check our input
if(!tokenizer.hasMoreTokens()) throw new PragmaFormatException(
"Pragma " + name + " requires one or more string arguments");
// Build our argument
String collapsed = ListUtils.collapseTokens(tokenizer.toList());
// Run the pragma
consumer.accept(collapsed, state);
};
}
}
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