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/*
* Copyright 2013 eXo Platform SAS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package juzu.impl.router.parser;
import juzu.impl.router.regex.SyntaxException;
import juzu.impl.common.Location;
/**
* An hand crafted parser for the compact route syntax.
*
* @author Julien Viet */
public class RouteParser {
/** . */
public static final int CODE_UNCLOSED_EXPR = 0;
/** . */
public static final int CODE_MISSING_EXPR_IDENT = 1;
/** . */
private static final int READ_PATH = 0;
/** . */
private static final int READ_SEGMENT = 1;
/** . */
private static final int READ_DONE = 7;
/** . */
private static final int EXPR_BEGIN = 0;
/** . */
private static final int EXPR_IDENT = 1;
public static void parse(CharSequence s, RouteParserHandler handler) throws SyntaxException {
parse(s, 0, s.length(), handler);
}
private static void parse(CharSequence s, int from, final int to, RouteParserHandler handler) throws SyntaxException {
int status = READ_PATH;
int pos = 0;
while (true) {
//
switch (status) {
case READ_PATH: {
if (from < to) {
char c = s.charAt(from);
if (c == '/') {
from++;
} else {
handler.segmentOpen();
status = READ_SEGMENT;
pos = from;
}
} else {
boolean slash = from > pos && s.charAt(from - 1) == '/';
handler.pathClose(slash);
status = READ_DONE;
}
break;
}
case READ_SEGMENT: {
if (from < to) {
char c = s.charAt(from);
if (c == '{') {
if (from - pos > 0) {
handler.segmentChunk(s, pos, from);
}
handler.exprOpen();
from = pos = parseExpr(s, from + 1, to, handler);
handler.exprClose();
} else if (c == '/') {
status = READ_PATH;
if (from - pos > 0) {
handler.segmentChunk(s, pos, from);
}
handler.segmentClose();
} else {
++from;
}
} else {
if (from - pos > 0) {
handler.segmentChunk(s, pos, from);
}
handler.segmentClose();
status = READ_PATH;
}
break;
}
case READ_DONE:
return;
default:
throw new UnsupportedOperationException("Need to implement status " + status);
}
}
}
private static int parseExpr(CharSequence s, int from, int to, RouteParserHandler handler) throws SyntaxException {
int status = EXPR_BEGIN;
int pos = from;
while (true) {
switch (status) {
case EXPR_BEGIN: {
if (from < to) {
char c = s.charAt(from);
if (c == '}') {
throw new SyntaxException(CODE_MISSING_EXPR_IDENT, "Missing expression identifier at " + from, Location.at(1 + from));
} else {
status = EXPR_IDENT;
break;
}
} else {
throw new SyntaxException(CODE_UNCLOSED_EXPR, "Unclosed expression at " + from, Location.at(1 + from));
}
}
case EXPR_IDENT: {
if (from < to) {
char c = s.charAt(from);
if (c == '}') {
handler.exprIdent(s, pos, from);
return ++from;
} else {
++from;
break;
}
} else {
throw new SyntaxException(CODE_UNCLOSED_EXPR, "Unclosed expression at " + from, Location.at(1 + from));
}
}
default:
throw new UnsupportedOperationException("todo");
}
}
}
}
