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RegExpBuilder.java
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RegExpBuilder.java
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import java.util.Arrays;
import java.util.HashSet;
import java.util.regex.Pattern;
public class RegExpBuilder {
private StringBuilder _literal;
private Boolean _ignoreCase;
private Boolean _multiLine;
private HashSet<Character> _specialCharactersInsideCharacterClass;
private HashSet<Character> _specialCharactersOutsideCharacterClass;
private StringBuilder _escapedString;
private int _min;
private int _max;
private String _of;
private Boolean _ofAny;
private int _ofGroup;
private String _from;
private String _notFrom;
private String _like;
private String _behind;
private String _notBehind;
private String _either;
private Boolean _reluctant;
private Boolean _capture;
public RegExpBuilder() {
_literal = new StringBuilder();
_specialCharactersInsideCharacterClass = new HashSet<Character>(Arrays.asList(new Character[]{ '^', '-', ']' }));
_specialCharactersOutsideCharacterClass = new HashSet<Character>(Arrays.asList(new Character[]{ '.', '^', '$', '*', '+', '?', '(', ')', '[', '{' }));
_escapedString = new StringBuilder();
_clear();
}
private void _clear() {
_ignoreCase = false;
_multiLine = false;
_min = -1;
_max = -1;
_of = "";
_ofAny = false;
_ofGroup = -1;
_from = "";
_notFrom = "";
_like = "";
_behind = "";
_notBehind = "";
_either = "";
_reluctant = false;
_capture = false;
}
private void _flushState() {
if (_of != "" || _ofAny || _ofGroup > 0 || _from != "" || _notFrom != "" || _like != "") {
String captureLiteral = _capture ? "" : "?:";
String quantityLiteral = getQuantityLiteral();
String characterLiteral = getCharacterLiteral();
String reluctantLiteral = _reluctant ? "?" : "";
String behindLiteral = _behind != "" ? "(?=" + _behind + ")" : "";
String notBehindLiteral = _notBehind != "" ? "(?!" + _notBehind + ")" : "";
_literal.append("(" + captureLiteral + "(?:" + characterLiteral + ")" + quantityLiteral + reluctantLiteral + ")" + behindLiteral + notBehindLiteral);
_clear();
}
}
private String getQuantityLiteral() {
if (_min != -1) {
if (_max != -1) {
return "{" + _min + "," + _max + "}";
}
return "{" + _min + ",}";
}
return "{0," + _max + "}";
}
private String getCharacterLiteral() {
if (_of != "") {
return _of;
}
if (_ofAny) {
return ".";
}
if (_ofGroup > 0) {
return "\\" + _ofGroup;
}
if (_from != "") {
return "[" + _from + "]";
}
if (_notFrom != "") {
return "[^" + _notFrom + "]";
}
if (_like != "") {
return _like;
}
return "";
}
public String getLiteral() {
_flushState();
return _literal.toString();
}
public Pattern getRegExp() {
_flushState();
int flags = 0;
if (_ignoreCase) {
flags = flags | Pattern.CASE_INSENSITIVE;
}
if (_multiLine) {
flags = flags | Pattern.MULTILINE;
}
return Pattern.compile(_literal.toString(), flags);
}
public RegExpBuilder ignoreCase() {
_ignoreCase = true;
return this;
}
public RegExpBuilder multiLine() {
_multiLine = true;
return this;
}
public RegExpBuilder start() {
_literal.append("(?:^)");
return this;
}
public RegExpBuilder end() {
_flushState();
_literal.append("(?:$)");
return this;
}
public RegExpBuilder either(RegExpBuilder r) {
_flushState();
_either = r.getLiteral();
return this;
}
public RegExpBuilder either(String s) {
return this.either(new RegExpBuilder().exactly(1).of(s));
}
public RegExpBuilder or(RegExpBuilder r) {
String either = _either;
String or = r.getLiteral();
if (either == "") {
_literal.deleteCharAt(_literal.length() - 1);
_literal.append("|(?:" + or + "))");
}
else {
_literal.append("(?:(?:" + either + ")|(?:" + or + "))");
}
_clear();
return this;
}
public RegExpBuilder or(String s) {
return this.or(new RegExpBuilder().exactly(1).of(s));
}
public RegExpBuilder exactly(int n) {
_flushState();
_min = n;
_max = n;
return this;
}
public RegExpBuilder min(int n) {
_flushState();
_min = n;
return this;
}
public RegExpBuilder max(int n) {
_flushState();
_max = n;
return this;
}
public RegExpBuilder of(String s) {
_of = _escapeOutsideCharacterClass(s);
return this;
}
public RegExpBuilder ofAny() {
_ofAny = true;
return this;
}
public RegExpBuilder ofGroup(int n) {
_ofGroup = n;
return this;
}
public RegExpBuilder from(char[] s) {
_from = _escapeInsideCharacterClass(new String(s));
return this;
}
public RegExpBuilder notFrom(char[] s) {
_notFrom = _escapeInsideCharacterClass(new String(s));
return this;
}
public RegExpBuilder like(RegExpBuilder r) {
_like = r.getLiteral();
return this;
}
public RegExpBuilder reluctantly() {
_reluctant = true;
return this;
}
public RegExpBuilder behind(RegExpBuilder r) {
_behind = r.getLiteral();
return this;
}
public RegExpBuilder notBehind(RegExpBuilder r) {
_notBehind = r.getLiteral();
return this;
}
public RegExpBuilder asGroup() {
_capture = true;
return this;
}
public RegExpBuilder then(String s) {
return exactly(1).of(s);
}
public RegExpBuilder some(char[] s) {
return min(1).from(s);
}
public RegExpBuilder maybe(String s) {
return max(1).of(s);
}
private String _escapeInsideCharacterClass(String s) {
return _escapeSpecialCharacters(s, _specialCharactersInsideCharacterClass);
}
private String _escapeOutsideCharacterClass(String s) {
return _escapeSpecialCharacters(s, _specialCharactersOutsideCharacterClass);
}
private String _escapeSpecialCharacters(String s, HashSet<Character> specialCharacters) {
_escapedString = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
char character = s.charAt(i);
if (specialCharacters.contains(character)) {
_escapedString.append("\\" + character);
}
else {
_escapedString.append(character);
}
}
return _escapedString.toString();
}
}