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package org.glassfish.jersey.uri.internal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.uri.UriComponent;
/**
* A URI template parser that parses JAX-RS specific URI templates.
*
* @author Paul Sandoz
* @author Gerard Davison (gerard.davison at oracle.com)
*/
public class UriTemplateParser {
/* package */ static final int[] EMPTY_INT_ARRAY = new int[0];
private static final Set RESERVED_REGEX_CHARACTERS = initReserved();
private static final String[] HEX_TO_UPPERCASE_REGEX = initHexToUpperCaseRegex();
private static Set initReserved() {
char[] reserved = {
'.', '^', '&', '!',
'?', '-', ':', '<',
'(', '[', '$', '=',
')', ']', ',', '>',
'*', '+', '|'};
Set s = new HashSet(reserved.length);
for (char c : reserved) {
s.add(c);
}
return s;
}
/**
* Default URI template value regexp pattern.
*/
public static final Pattern TEMPLATE_VALUE_PATTERN = Pattern.compile("[^/]+");
private final String template;
private final StringBuffer regex = new StringBuffer();
private final StringBuffer normalizedTemplate = new StringBuffer();
private final StringBuffer literalCharactersBuffer = new StringBuffer();
private final Pattern pattern;
private final List names = new ArrayList();
private final List groupCounts = new ArrayList();
private final Map nameToPattern = new HashMap();
private int numOfExplicitRegexes;
private int skipGroup;
private int literalCharacters;
/**
* Parse a template.
*
* @param template the template.
* @throws IllegalArgumentException if the template is null, an empty string
* or does not conform to a JAX-RS URI template.
*/
public UriTemplateParser(final String template) throws IllegalArgumentException {
if (template == null || template.isEmpty()) {
throw new IllegalArgumentException("Template is null or has zero length");
}
this.template = template;
parse(new CharacterIterator(template));
try {
pattern = Pattern.compile(regex.toString());
} catch (PatternSyntaxException ex) {
throw new IllegalArgumentException("Invalid syntax for the template expression '"
+ regex + "'",
ex
);
}
}
/**
* Get the template.
*
* @return the template.
*/
public final String getTemplate() {
return template;
}
/**
* Get the pattern.
*
* @return the pattern.
*/
public final Pattern getPattern() {
return pattern;
}
/**
* Get the normalized template.
*
* A normalized template is a template without any explicit regular
* expressions.
*
* @return the normalized template.
*/
public final String getNormalizedTemplate() {
return normalizedTemplate.toString();
}
/**
* Get the map of template names to patterns.
*
* @return the map of template names to patterns.
*/
public final Map getNameToPattern() {
return nameToPattern;
}
/**
* Get the list of template names.
*
* @return the list of template names.
*/
public final List getNames() {
return names;
}
/**
* Get the capturing group counts for each template variable.
*
* @return the capturing group counts.
*/
public final List getGroupCounts() {
return groupCounts;
}
/**
* Get the group indexes to capturing groups.
*
* Any nested capturing groups will be ignored and the
* the group index will refer to the top-level capturing
* groups associated with the templates variables.
*
* @return the group indexes to capturing groups.
*/
public final int[] getGroupIndexes() {
if (names.isEmpty()) {
return EMPTY_INT_ARRAY;
}
int[] indexes = new int[names.size()];
indexes[0] = 0 + groupCounts.get(0);
for (int i = 1; i < indexes.length; i++) {
indexes[i] = indexes[i - 1] + groupCounts.get(i);
}
return indexes;
}
/**
* Get the number of explicit regular expressions.
*
* @return the number of explicit regular expressions.
*/
public final int getNumberOfExplicitRegexes() {
return numOfExplicitRegexes;
}
/**
* Get the number of regular expression groups
*
* @return the number of regular expressions groups
*
* @since 2.9
*/
public final int getNumberOfRegexGroups() {
if (groupCounts.isEmpty()) {
return 0;
} else {
int[] groupIndex = getGroupIndexes();
return groupIndex[groupIndex.length - 1] + skipGroup;
}
}
/**
* Get the number of literal characters.
*
* @return the number of literal characters.
*/
public final int getNumberOfLiteralCharacters() {
return literalCharacters;
}
/**
* Encode literal characters of a template.
*
* @param characters the literal characters
* @return the encoded literal characters.
*/
protected String encodeLiteralCharacters(final String characters) {
return characters;
}
private void parse(final CharacterIterator ci) {
try {
while (ci.hasNext()) {
char c = ci.next();
if (c == '{') {
processLiteralCharacters();
skipGroup = parseName(ci, skipGroup);
} else {
literalCharactersBuffer.append(c);
}
}
processLiteralCharacters();
} catch (NoSuchElementException ex) {
throw new IllegalArgumentException(LocalizationMessages.ERROR_TEMPLATE_PARSER_INVALID_SYNTAX_TERMINATED(
template), ex);
}
}
private void processLiteralCharacters() {
if (literalCharactersBuffer.length() > 0) {
literalCharacters += literalCharactersBuffer.length();
String s = encodeLiteralCharacters(literalCharactersBuffer.toString());
normalizedTemplate.append(s);
// Escape if reserved regex character
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (RESERVED_REGEX_CHARACTERS.contains(c)) {
regex.append("\\");
regex.append(c);
} else if (c == '%') {
final char c1 = s.charAt(i + 1);
final char c2 = s.charAt(i + 2);
if (UriComponent.isHexCharacter(c1) && UriComponent.isHexCharacter(c2)) {
regex.append("%").append(HEX_TO_UPPERCASE_REGEX[c1]).append(HEX_TO_UPPERCASE_REGEX[c2]);
i += 2;
}
} else {
regex.append(c);
}
}
literalCharactersBuffer.setLength(0);
}
}
private static String[] initHexToUpperCaseRegex() {
String[] table = new String[0x80];
for (int i = 0; i < table.length; i++) {
table[i] = String.valueOf((char) i);
}
for (char c = 'a'; c <= 'f'; c++) {
// initialize table values: table[a] = ([aA]) ...
table[c] = "[" + c + (char) (c - 'a' + 'A') + "]";
}
for (char c = 'A'; c <= 'F'; c++) {
// initialize table values: table[A] = ([aA]) ...
table[c] = "[" + (char) (c - 'A' + 'a') + c + "]";
}
return table;
}
private int parseName(final CharacterIterator ci, int skipGroup) {
char c = consumeWhiteSpace(ci);
char paramType = 'p'; // Normal path param unless otherwise stated
StringBuilder nameBuffer = new StringBuilder();
// Look for query or matrix types
if (c == '?' || c == ';') {
paramType = c;
c = ci.next();
}
if (Character.isLetterOrDigit(c) || c == '_') {
// Template name character
nameBuffer.append(c);
} else {
throw new IllegalArgumentException(LocalizationMessages.ERROR_TEMPLATE_PARSER_ILLEGAL_CHAR_START_NAME(c, ci.pos(),
template));
}
String nameRegexString = "";
while (true) {
c = ci.next();
// "\\{(\\w[-\\w\\.]*)
if (Character.isLetterOrDigit(c) || c == '_' || c == '-' || c == '.') {
// Template name character
nameBuffer.append(c);
} else if (c == ',' && paramType != 'p') {
// separator allowed for non-path parameter names
nameBuffer.append(c);
} else if (c == ':' && paramType == 'p') {
nameRegexString = parseRegex(ci);
break;
} else if (c == '}') {
break;
} else if (c == ' ') {
c = consumeWhiteSpace(ci);
if (c == ':') {
nameRegexString = parseRegex(ci);
break;
} else if (c == '}') {
break;
} else {
// Error
throw new IllegalArgumentException(
LocalizationMessages.ERROR_TEMPLATE_PARSER_ILLEGAL_CHAR_AFTER_NAME(c, ci.pos(), template));
}
} else {
throw new IllegalArgumentException(
LocalizationMessages.ERROR_TEMPLATE_PARSER_ILLEGAL_CHAR_PART_OF_NAME(c, ci.pos(), template));
}
}
String name = nameBuffer.toString();
Pattern namePattern;
try {
if (paramType == '?' || paramType == ';') {
String[] subNames = name.split(",\\s?");
// Build up the regex for each of these properties
StringBuilder regexBuilder = new StringBuilder(paramType == '?' ? "\\?" : ";");
String separator = paramType == '?' ? "\\&" : ";/\\?";
// Start a group because each parameter could repeat
// names.add("__" + (paramType == '?' ? "query" : "matrix"));
boolean first = true;
regexBuilder.append("(");
for (String subName : subNames) {
regexBuilder.append("(&?");
regexBuilder.append(subName);
regexBuilder.append("(=([^");
regexBuilder.append(separator);
regexBuilder.append("]*))?");
regexBuilder.append(")");
if (!first) {
regexBuilder.append("|");
}
names.add(subName);
groupCounts.add(
first ? 5 : 3);
first = false;
}
// groupCounts.add(1);
skipGroup = 1;
// Knock of last bar
regexBuilder.append(")*");
namePattern = Pattern.compile(regexBuilder.toString());
// Make sure we display something useful
name = paramType + name;
} else {
names.add(name);
// groupCounts.add(1 + skipGroup);
if (!nameRegexString.isEmpty()) {
numOfExplicitRegexes++;
}
namePattern = (nameRegexString.isEmpty())
? TEMPLATE_VALUE_PATTERN : Pattern.compile(nameRegexString);
if (nameToPattern.containsKey(name)) {
if (!nameToPattern.get(name).equals(namePattern)) {
throw new IllegalArgumentException(
LocalizationMessages.ERROR_TEMPLATE_PARSER_NAME_MORE_THAN_ONCE(name, template));
}
} else {
nameToPattern.put(name, namePattern);
}
// Determine group count of pattern
Matcher m = namePattern.matcher("");
int g = m.groupCount();
groupCounts.add(1 + skipGroup);
skipGroup = g;
}
regex.append('(')
.append(namePattern)
.append(')');
normalizedTemplate.append('{')
.append(name)
.append('}');
} catch (PatternSyntaxException ex) {
throw new IllegalArgumentException(
LocalizationMessages.ERROR_TEMPLATE_PARSER_INVALID_SYNTAX(nameRegexString, name, template), ex);
}
// Tell the next time through the loop how many to skip
return skipGroup;
}
private String parseRegex(final CharacterIterator ci) {
StringBuilder regexBuffer = new StringBuilder();
int braceCount = 1;
while (true) {
char c = ci.next();
if (c == '{') {
braceCount++;
} else if (c == '}') {
braceCount--;
if (braceCount == 0) {
break;
}
}
regexBuffer.append(c);
}
return regexBuffer.toString().trim();
}
private char consumeWhiteSpace(final CharacterIterator ci) {
char c;
do {
c = ci.next();
} while (Character.isWhitespace(c));
return c;
}
}