net.sourceforge.plantuml.regexdiagram.RegexExpression Maven / Gradle / Ivy
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PlantUML is a component that allows to quickly write diagrams from text.
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.regexdiagram;
import java.util.ArrayList;
import java.util.List;
import net.sourceforge.plantuml.utils.CharInspector;
public class RegexExpression {
// ::remove folder when __HAXE__
public static List parse(CharInspector it) throws RegexParsingException {
final List result = new ArrayList<>();
while (true) {
final char current = it.peek(0);
if (current == '\0')
break;
// System.err.println("current=" + current);
if (isStartAnchor(it)) {
final String s = readAnchor(it);
result.add(new ReToken(ReTokenType.ANCHOR, s));
} else if (isEscapedChar(it)) {
result.add(new ReToken(ReTokenType.ESCAPED_CHAR, "" + it.peek(1)));
it.jump();
it.jump();
} else if (current == '|') {
result.add(new ReToken(ReTokenType.ALTERNATIVE, "|"));
it.jump();
} else if (current == '[') {
final String s = readGroup(it);
result.add(new ReToken(ReTokenType.GROUP, s));
} else if (isStartOpenParenthesis(it)) {
final String s = readOpenParenthesis(it);
result.add(new ReToken(ReTokenType.PARENTHESIS_OPEN, s));
} else if (current == ')') {
result.add(new ReToken(ReTokenType.PARENTHESIS_CLOSE, ")"));
it.jump();
} else if (isStartQuantifier(it)) {
final String s = readQuantifier(it);
result.add(new ReToken(ReTokenType.QUANTIFIER, s));
} else if (isStartOctalEscape(it)) {
final String s = readUnicodeOrOctalEscape(it, 4);
result.add(new ReToken(ReTokenType.CLASS, s));
} else if (isStartUnicodeEscape(it)) {
final String s = readUnicodeOrOctalEscape(it, 5);
result.add(new ReToken(ReTokenType.CLASS, s));
} else if (isStartUnicodeClass(it)) {
final String s = readUnicodeClass(it);
result.add(new ReToken(ReTokenType.CLASS, s));
} else if (isStartClass(it)) {
final String s = readClass(it);
result.add(new ReToken(ReTokenType.CLASS, s));
} else if (isSimpleLetter(current)) {
result.add(new ReToken(ReTokenType.SIMPLE_CHAR, "" + current));
it.jump();
} else {
throw new IllegalStateException();
}
}
// System.err.println("result=" + result);
return result;
}
private static boolean isStartOpenParenthesis(CharInspector it) {
final char current0 = it.peek(0);
if (current0 == '(')
return true;
return false;
}
private static String readOpenParenthesis(CharInspector it) {
final char current0 = it.peek(0);
it.jump();
final StringBuilder result = new StringBuilder();
result.append(current0);
if (it.peek(0) == '?' && it.peek(1) == ':') {
it.jump();
it.jump();
result.append("?:");
}
if (it.peek(0) == '?' && it.peek(1) == '!') {
it.jump();
it.jump();
result.append("?!");
}
return result.toString();
}
private static boolean isStartQuantifier(CharInspector it) {
final char current0 = it.peek(0);
if (current0 == '*' || current0 == '+' || current0 == '?' || current0 == '{')
return true;
return false;
}
private static String readQuantifier(CharInspector it) throws RegexParsingException {
final char current0 = it.peek(0);
it.jump();
final StringBuilder tmp = new StringBuilder();
tmp.append(current0);
if (current0 == '{')
while (it.peek(0) != 0) {
final char ch = it.peek(0);
tmp.append(ch);
it.jump();
if (ch == '}')
break;
}
if (it.peek(0) == '?') {
tmp.append('?');
it.jump();
}
// System.err.println("RESULT=" + tmp);
final String result = tmp.toString();
if (result.startsWith("{") && result.matches("^\\{[0-9,]+\\}$") == false)
throw new RegexParsingException("Bad quantifier " + result);
return result;
}
private static boolean isEscapedChar(CharInspector it) {
final char current0 = it.peek(0);
if (current0 == '\\') {
final char current1 = it.peek(1);
if (current1 == '.' || current1 == '*' || current1 == '\\' || current1 == '?' || current1 == '^'
|| current1 == '$' || current1 == '|' || current1 == '(' || current1 == ')' || current1 == '['
|| current1 == ']' || current1 == '{' || current1 == '}' || current1 == '<' || current1 == '>')
return true;
}
return false;
}
private static String readGroup(CharInspector it) {
final char current0 = it.peek(0);
if (current0 != '[')
throw new IllegalStateException();
it.jump();
final StringBuilder result = new StringBuilder();
while (it.peek(0) != 0) {
char ch = it.peek(0);
it.jump();
if (ch == ']')
break;
result.append(ch);
if (ch == '\\') {
ch = it.peek(0);
it.jump();
result.append(ch);
}
}
return result.toString();
}
private static String readUnicodeClass(CharInspector it) throws RegexParsingException {
final char current0 = it.peek(0);
if (current0 != '\\')
throw new IllegalStateException();
it.jump();
final StringBuilder result = new StringBuilder();
result.append(current0);
while (it.peek(0) != 0) {
final char ch = it.peek(0);
it.jump();
result.append(ch);
if (ch == '}')
return result.toString();
}
throw new RegexParsingException("Unexpected end of data");
}
private static String readUnicodeOrOctalEscape(CharInspector it, int nb) throws RegexParsingException {
final char current0 = it.peek(0);
if (current0 != '\\')
throw new IllegalStateException();
it.jump();
final StringBuilder result = new StringBuilder();
result.append(current0);
for (int i = 0; i < nb; i++) {
final char ch = it.peek(0);
if (ch == 0)
throw new RegexParsingException("Unexpected end of data");
result.append(ch);
it.jump();
}
return result.toString();
}
private static String readClass(CharInspector it) {
final char current0 = it.peek(0);
if (current0 == '.') {
it.jump();
return "" + current0;
}
if (current0 == '\\') {
it.jump();
final String result = "" + current0 + it.peek(0);
it.jump();
return result;
}
throw new IllegalStateException();
}
private static boolean isStartClass(CharInspector it) {
final char current0 = it.peek(0);
if (current0 == '.')
return true;
if (current0 == '\\')
return true;
return false;
}
private static boolean isStartUnicodeClass(CharInspector it) {
if (it.peek(0) == '\\' && it.peek(1) == 'p' && it.peek(2) == '{')
return true;
if (it.peek(0) == '\\' && it.peek(1) == 'x' && it.peek(2) == '{')
return true;
return false;
}
private static boolean isStartUnicodeEscape(CharInspector it) {
if (it.peek(0) == '\\' && it.peek(1) == 'u')
return true;
return false;
}
private static boolean isStartOctalEscape(CharInspector it) {
if (it.peek(0) == '\\' && it.peek(1) == '0')
return true;
return false;
}
private static boolean isSimpleLetter(char ch) {
if (ch == '\\' || ch == '.')
return false;
return true;
}
private static boolean isStartAnchor(CharInspector it) {
final char current0 = it.peek(0);
if (current0 == '^' || current0 == '$')
return true;
if (current0 == '\\') {
final char current1 = it.peek(1);
if (current1 == 'A' || current1 == 'Z' || current1 == 'z' || current1 == 'G' || current1 == 'b'
|| current1 == 'B')
return true;
}
return false;
}
private static String readAnchor(CharInspector it) {
final char current0 = it.peek(0);
if (current0 == '^' || current0 == '$') {
it.jump();
return "" + current0;
}
if (current0 == '\\') {
it.jump();
final String result = "" + current0 + it.peek(0);
it.jump();
return result;
}
throw new IllegalStateException();
}
}