GitNex/app/src/main/java/org/mian/gitnex/helpers/codeeditor/languages/CppLanguage.java

package org.mian.gitnex.helpers.codeeditor.languages;

import com.amrdeveloper.codeview.Code;
import com.amrdeveloper.codeview.Keyword;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;

/**
 * @author qwerty287
 */
public class CppLanguage extends Language {

	private static final Pattern PATTERN_BUILTINS = Pattern.compile("[,:;[->]{}()]");
	private static final Pattern PATTERN_SINGLE_LINE_COMMENT = Pattern.compile("//[^\\n]*");
	private static final Pattern PATTERN_MULTI_LINE_COMMENT =
			Pattern.compile("/\\*[^*]*\\*+(?:[^/*][^*]*\\*+)*/");
	private static final Pattern PATTERN_ATTRIBUTE = Pattern.compile("\\.[a-zA-Z0-9_]+");
	private static final Pattern PATTERN_OPERATION =
			Pattern.compile(
					":|==|>|<|!=|>=|<=|->|=|>|<|%|-|-=|%=|\\+|\\-|\\-=|\\+=|\\^|\\&|\\|::|\\?|\\*");
	private static final Pattern PATTERN_GENERIC = Pattern.compile("<[a-zA-Z0-9,<>]+>");
	private static final Pattern PATTERN_TODO_COMMENT =
			Pattern.compile("//\\s?(TODO|todo)\\s[^\n]*");
	private static final Pattern PATTERN_NUMBERS = Pattern.compile("\\b(\\d*[.]?\\d+)\\b");
	private static final Pattern PATTERN_CHAR = Pattern.compile("['](.*?)[']");
	private static final Pattern PATTERN_STRING = Pattern.compile("[\"](.*?)[\"]");
	private static final Pattern PATTERN_HEX = Pattern.compile("0x[0-9a-fA-F]+");

	public static String getCommentStart() {
		return "//";
	}

	public static String getCommentEnd() {
		return "";
	}

	@Override
	public Pattern getPattern(LanguageElement element) {
		switch (element) {
			case KEYWORD:
				return Pattern.compile("\\b(" + String.join("|", getKeywords()) + ")\\b");
			case BUILTIN:
				return PATTERN_BUILTINS;
			case NUMBER:
				return PATTERN_NUMBERS;
			case CHAR:
				return PATTERN_CHAR;
			case STRING:
				return PATTERN_STRING;
			case HEX:
				return PATTERN_HEX;
			case SINGLE_LINE_COMMENT:
				return PATTERN_SINGLE_LINE_COMMENT;
			case MULTI_LINE_COMMENT:
				return PATTERN_MULTI_LINE_COMMENT;
			case ATTRIBUTE:
				return PATTERN_ATTRIBUTE;
			case OPERATION:
				return PATTERN_OPERATION;
			case TODO_COMMENT:
				return PATTERN_TODO_COMMENT;
			case GENERIC:
				return PATTERN_GENERIC;
			case ANNOTATION:
			default:
				return null;
		}
	}

	@Override
	public String[] getKeywords() {
		return new String[] {
			"asm	double",
			"new",
			"switch",
			"auto",
			"else",
			"operator",
			"template",
			"break",
			"enum",
			"private",
			"this",
			"case",
			"extern",
			"protected",
			"throw",
			"catch",
			"float",
			"public",
			"try",
			"char",
			"for",
			"register",
			"typedef",
			"class",
			"friend",
			"return",
			"union",
			"const",
			"goto",
			"short",
			"unsigned",
			"continue",
			"if",
			"signed",
			"virtual",
			"default",
			"inline",
			"sizeof",
			"void",
			"delete",
			"int",
			"static",
			"volatile",
			"do",
			"long",
			"struct",
			"while"
		};
	}

	@Override
	public List<Code> getCodeList() {
		List<Code> codeList = new ArrayList<>();
		String[] keywords = getKeywords();
		for (String keyword : keywords) {
			codeList.add(new Keyword(keyword));
		}
		return codeList;
	}

	@Override
	public String getName() {
		return "Cpp";
	}

	@Override
	public Set<Character> getIndentationStarts() {
		Set<Character> characterSet = new HashSet<>();
		characterSet.add('{');
		return characterSet;
	}

	@Override
	public Set<Character> getIndentationEnds() {
		Set<Character> characterSet = new HashSet<>();
		characterSet.add('}');
		return characterSet;
	}
}