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/*
* The MIT License
*
* Copyright (c) 2009-2023 PrimeTek Informatics
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.primefaces.convert;
import java.util.PrimitiveIterator.OfInt;
/**
* Reads and parses a date time pattern, such as {@code YYYY-mm-dd}. Accepts a visitor object with methods that
* are called when a token of the pattern is encountered. These callback methods may be used for example to
* transform the pattern into a different pattern.
*/
public class PatternReader {
private static final int INVALID_CODEPOINT = -1;
private OfInt iterator;
private int peeked = INVALID_CODEPOINT;
private StringBuilder literals = new StringBuilder();
private final TokenVisitor visitor;
/**
* Creates a new pattern read for processing the given string.
* @param sequence String with the pattern to process.
* @param visitor Visitor to call for each encountered token of the pattern.
*/
private PatternReader(CharSequence sequence, TokenVisitor visitor) {
this.iterator = sequence.codePoints().iterator();
this.visitor = visitor;
}
private void addLiteral(int literal) {
if (literal != INVALID_CODEPOINT) {
literals.appendCodePoint(literal);
}
}
private int consumeChar() {
final int peek = this.peeked;
if (peek == INVALID_CODEPOINT) {
return iterator.hasNext() ? iterator.nextInt() : INVALID_CODEPOINT;
}
else {
this.peeked = INVALID_CODEPOINT;
return peek;
}
}
private void consumeEscapeOrQuoteLiteral() {
// discard first quote mark (')
consumeChar();
if (peek() == '\'') {
// literal single quote
consumeChar();
addLiteral('\'');
}
else {
consumeQuotedLiteral();
}
}
private void consumePattern() {
while (!isEoi()) {
final int ch = peek();
if (ch == '\'') {
consumeEscapeOrQuoteLiteral();
}
else if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
consumePatternLetters();
}
else {
consumeChar();
addLiteral(ch);
}
}
finishLiterals();
}
private void consumePatternLetters() {
final int letter = consumeChar();
int repetitions = 1;
while (peek() == letter) {
consumeChar();
repetitions += 1;
}
processPatternLetter(letter, repetitions);
}
private void consumeQuotedLiteral() {
while (!isEoi()) {
final int ch = consumeChar();
// Literal character in quote
if (ch != '\'') {
addLiteral(ch);
}
// Literal quote mark ('')
else if (peek() == '\'') {
consumeChar();
addLiteral('\'');
}
// End of quoted literal
else {
break;
}
}
}
private void finishLiterals() {
if (literals.length() > 0) {
visitor.visitLiteral(literals.toString());
literals.setLength(0);
}
}
private boolean isEoi() {
return peeked == INVALID_CODEPOINT && !iterator.hasNext();
}
private int peek() {
if (peeked == INVALID_CODEPOINT && iterator.hasNext()) {
peeked = iterator.nextInt();
}
return peeked;
}
private void processPatternLetter(int letter, int repetitions) {
finishLiterals();
visitor.visitTokenLetter(letter, repetitions);
}
/**
* Parses the given pattern and calls the visitor for each encountered pattern.
* @param sequence String with the pattern to process.
* @param visitor Visitor to call for each encountered token of the pattern.
*/
public static void parsePattern(CharSequence sequence, TokenVisitor visitor) {
final PatternReader reader = new PatternReader(sequence, visitor);
reader.consumePattern();
}
/**
* Visits a date time pattern token when one encountered. All methods receive a custom object.
*/
public interface TokenVisitor {
/**
* Visits a literal token, i.e. plain text without special meaning.
* @param text Plain text to process.
*/
void visitLiteral(String text);
/**
*
* @param letter The token letter that was encountered, i.e. {@code Y}.
* @param repetitions The number of repetitions of the letter. E.g. when a pattern contains {@code YYYY},
* with method is called once with {@code repetitions} set to {@code 4}.
*/
void visitTokenLetter(int letter, int repetitions);
}
}
