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package org.jooby.internal;
import static java.util.Objects.requireNonNull;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import javaslang.Tuple;
import javaslang.Tuple4;
public class RoutePattern {
private static final Pattern GLOB = Pattern
/** ?| ** | * | :var | {var(:.*)} */
//.compile("\\?|/\\*\\*|\\*|\\:((?:[^/]+)+?) |\\{((?:\\{[^/]+?\\}|[^/{}]|\\\\[{}])+?)\\}");
/** ? | **:name | * | :var | */
.compile("\\?|/\\*\\*(\\:(?:[^/]+))?|\\*|\\:((?:[^/]+)+?)|\\{((?:\\{[^/]+?\\}|[^/{}]|\\\\[{}])+?)\\}");
private static final Pattern SLASH = Pattern.compile("//+");
private final Function matcher;
private String pattern;
private List vars;
private List reverse;
private boolean glob;
public RoutePattern(final String verb, final String pattern) {
requireNonNull(verb, "A HTTP verb is required.");
requireNonNull(pattern, "A path pattern is required.");
this.pattern = normalize(pattern);
Tuple4, List, List, Boolean> result = rewrite(this,
verb.toUpperCase(), this.pattern.replace("/**/", "/**"));
matcher = result._1;
vars = result._2;
reverse = result._3;
glob = result._4;
}
public boolean glob() {
return glob;
}
public List vars() {
return vars;
}
public String pattern() {
return pattern;
}
public String reverse(final Map vars) {
return reverse.stream()
.map(segment -> vars.getOrDefault(segment, segment).toString())
.collect(Collectors.joining(""));
}
public String reverse(final Object... value) {
List vars = vars();
Map hash = new HashMap<>();
for (int i = 0; i < Math.min(vars.size(), value.length); i++) {
hash.put(vars.get(i), value[i]);
}
return reverse(hash);
}
public RouteMatcher matcher(final String path) {
requireNonNull(path, "A path is required.");
return matcher.apply(path);
}
private static Tuple4, List, List, Boolean> rewrite(
final RoutePattern owner, final String verb, final String pattern) {
List vars = new LinkedList<>();
String rwrverb = verbs(verb);
StringBuilder patternBuilder = new StringBuilder(rwrverb);
Matcher matcher = GLOB.matcher(pattern);
int end = 0;
boolean regex = !rwrverb.equals(verb);
List reverse = new ArrayList<>();
boolean glob = false;
while (matcher.find()) {
String head = pattern.substring(end, matcher.start());
patternBuilder.append(Pattern.quote(head));
reverse.add(head);
String match = matcher.group();
if ("?".equals(match)) {
patternBuilder.append("([^/])");
reverse.add(match);
regex = true;
glob = true;
} else if ("*".equals(match)) {
patternBuilder.append("([^/]*)");
reverse.add(match);
regex = true;
glob = true;
} else if (match.equals("/**")) {
reverse.add(match);
patternBuilder.append("($|/.*)");
regex = true;
glob = true;
} else if (match.startsWith("/**:")) {
reverse.add(match.substring(1));
String varName = match.substring(4);
patternBuilder.append("/(?($|.*))");
vars.add(varName);
regex = true;
glob = true;
} else if (match.startsWith(":")) {
regex = true;
String varName = match.substring(1);
patternBuilder.append("(?[^/]+)");
vars.add(varName);
reverse.add(varName);
} else if (match.startsWith("{") && match.endsWith("}")) {
regex = true;
int colonIdx = match.indexOf(':');
if (colonIdx == -1) {
String varName = match.substring(1, match.length() - 1);
patternBuilder.append("(?[^/]+)");
vars.add(varName);
reverse.add(varName);
} else {
String varName = match.substring(1, colonIdx);
String regexpr = match.substring(colonIdx + 1, match.length() - 1);
patternBuilder.append("(?");
patternBuilder.append("**".equals(regexpr) ? "($|.*)" : regexpr);
patternBuilder.append(')');
vars.add(varName);
reverse.add(varName);
}
}
end = matcher.end();
}
String tail = pattern.substring(end, pattern.length());
reverse.add(tail);
patternBuilder.append(Pattern.quote(tail));
return Tuple.of(fn(owner, regex, regex ? patternBuilder.toString() : verb + pattern, vars),
vars, reverse, glob);
}
private static String verbs(final String verb) {
String[] verbs = verb.split("\\|");
if (verbs.length == 1) {
return verb.equals("*") ? "(?:[^/]*)" : verb;
}
return "(?:" + verb + ")";
}
private static Function fn(final RoutePattern owner, final boolean complex,
final String pattern, final List vars) {
return new Function() {
final Pattern regex = complex ? Pattern.compile(pattern) : null;
@Override
public RouteMatcher apply(final String fullpath) {
String path = fullpath.substring(fullpath.indexOf('/'));
return complex
? new RegexRouteMatcher(path, regex.matcher(fullpath), vars)
: new SimpleRouteMatcher(pattern, path, fullpath);
}
};
}
public static String normalize(final String pattern) {
if (pattern.equals("*")) {
return "/**";
}
if (pattern.equals("/")) {
return "/";
}
String normalized = SLASH.matcher(pattern).replaceAll("/");
if (normalized.equals("/")) {
return "/";
}
StringBuilder buffer = new StringBuilder();
if (!normalized.startsWith("/")) {
buffer.append("/");
}
buffer.append(normalized);
if (normalized.endsWith("/")) {
buffer.setLength(buffer.length() - 1);
}
return buffer.toString();
}
@Override
public String toString() {
return pattern;
}
}
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