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package org.hl7.fhir.utilities;
import java.util.ArrayList;
import java.util.List;
public class UnicodeUtilities {
public static class StateStackEntry {
private char c;
private int i;
public StateStackEntry(char c, int i) {
this.c = c;
this.i = i;
}
}
public static class StateStack {
private List list = new ArrayList<>();
public void clear() {
list.clear();
}
public void push(char c, int i) {
list.add(new StateStackEntry(c, i));
}
public void popJustOne(CharSet oneSet) {
if (!list.isEmpty() && oneSet.contains(list.get(list.size()-1).c)) {
list.remove(list.size()-1);
}
}
public void popOneAndOthers(CharSet oneSet, CharSet otherSet) {
boolean found = false;
for (StateStackEntry t : list) {
if (oneSet.contains(t.c)) {
found = true;
break;
}
}
if (found) {
while (!list.isEmpty() && (oneSet.contains(list.get(list.size()-1).c) || otherSet.contains(list.get(list.size()-1).c))) {
boolean done = oneSet.contains(list.get(list.size()-1).c);
list.remove(list.size()-1);
if (done) {
break;
}
}
}
}
public boolean empty() {
return list.isEmpty();
}
public String summary(String src) {
char ch = list.get(list.size()-1).c;
int i = list.get(list.size()-1).i;
String pt;
if (i == 0) {
pt = "";
} else if (i < 5) {
pt = " (preceding text = '"+src.substring(0, i)+"')";
} else {
pt = " (preceding text = '"+src.substring(i-5, i)+"')";
}
return "Unicode Character "+describe(ch)+" at index "+i+" has no terminating match"+pt;
}
}
public static class CharSet {
private char[] chars;
public CharSet(char... chars) {
this.chars = chars;
}
public boolean contains(char c) {
for (char t : chars) {
if (c == t) {
return true;
}
}
return false;
}
}
public static final char LRE = '\u202a';
public static final char RLE = '\u202b';
public static final char PDF = '\u202c';
public static final char LRO = '\u202d';
public static final char RLO = '\u202e';
public static final char LRI = '\u2066';
public static final char RLI = '\u2067';
public static final char FSI = '\u2068';
public static final char PDI = '\u2069';
public static final char LRM = '\u200E';
public static final char RLM = '\u200F';
public static final char ALM = '\u061C';
public static final char PARA = '\n';
private static CharSet allBiDiChars = new CharSet(LRE, RLE, PDF, LRO, RLO, LRI, RLI, FSI, PDI, LRM, RLM, ALM, PARA);
public static boolean hasBiDiChars(String src) {
for (char c : src.toCharArray()) {
if (allBiDiChars.contains(c)) {
return true;
}
}
return false;
}
/**
* returns null if src is well formed, or a description of a structure problem with bi-directional characters
* @param src
* @return
*/
public static String checkUnicodeWellFormed(String src) {
StateStack ss = new StateStack();
for (int i = 0; i < src.length(); i++) {
char c = src.charAt(i);
if (allBiDiChars.contains(c)) {
switch (c) {
case PARA:
ss.clear();
break;
case LRO:
case RLO:
ss.push(c, i);
break;
case PDF:
ss.popJustOne(new CharSet(LRE, RLE, LRO, RLO, LRM, RLM, ALM));
break;
case LRI:
case RLI:
case FSI:
ss.push(c, i);
break;
case PDI:
ss.popOneAndOthers(new CharSet(LRI, RLI, FSI), new CharSet(LRE, RLE, LRO, RLO, LRM, RLM, ALM));
break;
case LRM:
case RLM:
case ALM:
ss.push(c, i);
break;
}
}
}
if (ss.empty()) {
return null;
} else {
return ss.summary(src);
}
}
public static String describe(char c) {
switch (c) {
case LRE: return "LRE";
case RLE: return "RLE";
case PDF: return "PDF";
case LRO: return "LRO";
case RLO: return "RLO";
case LRI: return "LRI";
case RLI: return "RLI";
case FSI: return "FSI";
case PDI: return "PDI";
case LRM: return "LRM";
case RLM: return "RLM";
case ALM: return "ALM";
case PARA: return "PARA";
}
return String.valueOf(c);
}
public static Object replaceBiDiChars(String s) {
if (s == null) {
return null;
}
StringBuilder b = new StringBuilder();
for (char c : s.toCharArray()) {
if (allBiDiChars.contains(c)) {
b.append("|"+describe(c)+"|");
} else {
b.append(c);
}
}
return b.toString();
}
}
