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package com.sun.tools.javac.parser;

import java.util.HashSet;
import java.util.Set;

Methods used to support text blocks lint.

This is NOT part of any supported API. If you write code that depends on this, you do so at your own risk. This code and its internal interfaces are subject to change or deletion without notice.

/** * Methods used to support text blocks lint. * * <p><b>This is NOT part of any supported API. * If you write code that depends on this, you do so at your own risk. * This code and its internal interfaces are subject to change or * deletion without notice.</b> */
class TextBlockSupport { enum WhitespaceChecks { INCONSISTENT, TRAILING };
Check that the use of white space in content is not problematic.
/** Check that the use of white space in content is not problematic. */
static Set<WhitespaceChecks> checkWhitespace(String string) { // Start with empty result set. Set<WhitespaceChecks> checks = new HashSet<>(); // No need to check empty strings. if (string.isEmpty()) { return checks; } // Maximum common indentation. int outdent = 0; // No need to check indentation if opting out (last line is empty.) char lastChar = string.charAt(string.length() - 1); boolean optOut = lastChar == '\n' || lastChar == '\r'; // Split string based at line terminators. String[] lines = string.split("\\R"); int length = lines.length; // Extract last line. String lastLine = length == 0 ? "" : lines[length - 1]; if (!optOut) { // Prime with the last line indentation (may be blank.) outdent = indexOfNonWhitespace(lastLine); for (String line : lines) { // Blanks lines have no influence (last line accounted for.) if (!line.isBlank()) { outdent = Integer.min(outdent, indexOfNonWhitespace(line)); if (outdent == 0) { break; } } } } // Last line is representative. String start = lastLine.substring(0, outdent); for (String line : lines) { // Fail if a line does not have the same indentation. if (!line.isBlank() && !line.startsWith(start)) { // Mix of different white space checks.add(WhitespaceChecks.INCONSISTENT); } // Line has content even after indent is removed. if (outdent < line.length()) { // Is the last character a white space. lastChar = line.charAt(line.length() - 1); if (Character.isWhitespace(lastChar)) { // Has trailing white space. checks.add(WhitespaceChecks.TRAILING); } } } return checks; } private static int indexOfNonWhitespace(String string) { return string.length() - string.stripLeading().length(); } }