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package bjc.utils.ioutils;
import java.util.function.BiFunction;
import java.util.function.UnaryOperator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import bjc.utils.data.Toggle;
import bjc.utils.data.ValueToggle;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
import bjc.utils.functypes.ID;
/**
* Editor methods for strings based off the command language for the Sam editor.
*
* @author EVE
*
*/
public class RegexStringEditor {
private static final UnaryOperator<String> SID = ID.id();
/**
* Replace every occurrence of the pattern with the result of applying
* the action to the string matched by the pattern.
*
* @param input
* The input string to process.
*
* @param patt
* The pattern to match the string against.
*
* @param action
* The action to transform matches with.
*
* @return The string, with matches replaced with the action.
*/
public static String onOccurances(final String input, final Pattern patt, final UnaryOperator<String> action) {
return reduceOccurances(input, patt, SID, action);
}
/**
* Replace every occurrence between the patterns with the result of
* applying the action to the strings between the patterns.
*
* @param input
* The input string to process.
*
* @param patt
* The pattern to match the string against.
*
* @param action
* The action to transform matches with.
*
* @return The string, with strings between the matches replaced with
* the action.
*/
public static String betweenOccurances(final String input, final Pattern patt,
final UnaryOperator<String> action) {
return reduceOccurances(input, patt, action, SID);
}
/**
* Execute actions between and on matches of a regular expression.
*
* @param input
* The input string.
*
* @param rPatt
* The pattern to match against the string.
*
* @param betweenAction
* The function to execute between matches of the string.
*
* @param onAction
* The function to execute on matches of the string.
*
* @return The string, with both actions applied.
*/
public static String reduceOccurances(final String input, final Pattern rPatt,
final UnaryOperator<String> betweenAction, final UnaryOperator<String> onAction) {
/*
* Get all of the occurances.
*/
final IList<String> occurances = listOccurances(input, rPatt);
/*
* Execute the correct action on every occurance.
*/
final Toggle<UnaryOperator<String>> actions = new ValueToggle<>(onAction, betweenAction);
final BiFunction<String, StringBuilder, StringBuilder> reducer = (strang, state) -> {
return state.append(actions.get().apply(strang));
};
/*
* Convert the list back to a string.
*/
return occurances.reduceAux(new StringBuilder(), reducer, StringBuilder::toString);
}
/**
* Execute actions between and on matches of a regular expression.
*
* @param input
* The input string.
*
* @param rPatt
* The pattern to match against the string.
*
* @param betweenAction
* The function to execute between matches of the string.
*
* @param onAction
* The function to execute on matches of the string.
*
* @return The string, with both actions applied.
*/
public static IList<String> mapOccurances(final String input, final Pattern rPatt,
final UnaryOperator<String> betweenAction, final UnaryOperator<String> onAction) {
/*
* Get all of the occurances.
*/
final IList<String> occurances = listOccurances(input, rPatt);
/*
* Execute the correct action on every occurance.
*/
final Toggle<UnaryOperator<String>> actions = new ValueToggle<>(onAction, betweenAction);
return occurances.map(strang -> actions.get().apply(strang));
}
/**
* Separate a string into match/non-match segments.
*
* @param input
* The string to separate.
*
* @param rPatt
* The pattern to use for separation.
*
* @return The string, as a list of match/non-match segments,
* starting/ending with a non-match segment.
*/
public static IList<String> listOccurances(final String input, final Pattern rPatt) {
final IList<String> res = new FunctionalList<>();
/*
* Create the matcher and work buffer.
*/
final Matcher matcher = rPatt.matcher(input);
StringBuffer work = new StringBuffer();
/*
* For every match.
*/
while (matcher.find()) {
final String match = matcher.group();
/*
* Append the text until the match to the buffer.
*/
matcher.appendReplacement(work, "");
res.add(work.toString());
res.add(match);
/*
* Clear the buffer.
*/
work = new StringBuffer();
}
/*
* Add the text after the last match to the buffer.
*/
matcher.appendTail(work);
res.add(work.toString());
return res;
}
/**
* Apply an operation to a string if it matches a regular expression.
*
* @param input
* The input string.
*
* @param patt
* The pattern to match against it.
*
* @param action
* The action to execute if it matches.
*
* @return The string, modified by the action if the pattern matched.
*/
public static String ifMatches(final String input, final Pattern patt, final UnaryOperator<String> action) {
final Matcher matcher = patt.matcher(input);
if (matcher.matches()) {
return action.apply(input);
} else {
return input;
}
}
/**
* Apply an operation to a string if it matches a regular expression.
*
* @param input
* The input string.
*
* @param patt
* The pattern to match against it.
*
* @param action
* The action to execute if it doesn't match.
*
* @return The string, modified by the action if the pattern didn't
* match.
*/
public static String ifNotMatches(final String input, final Pattern patt, final UnaryOperator<String> action) {
final Matcher matcher = patt.matcher(input);
if (matcher.matches()) {
return input;
} else {
return action.apply(input);
}
}
}
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