CLToken.java
/*
* Copyright (C) 2021 The Android Open Source Project
*
* 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 androidx.constraintlayout.core.parser;
public class CLToken extends CLElement {
int index = 0;
Type type = Type.UNKNOWN;
public boolean getBoolean() throws CLParsingException {
if (type == Type.TRUE) {
return true;
}
if (type == Type.FALSE) {
return false;
}
throw new CLParsingException("this token is not a boolean: <" + content() + ">", this);
}
public boolean isNull() throws CLParsingException {
if (type == Type.NULL) {
return true;
}
throw new CLParsingException("this token is not a null: <" + content() + ">", this);
}
enum Type { UNKNOWN, TRUE, FALSE, NULL }
char[] tokenTrue = "true".toCharArray();
char[] tokenFalse = "false".toCharArray();
char[] tokenNull = "null".toCharArray();
public CLToken(char[] content) {
super(content);
}
public static CLElement allocate(char[] content) {
return new CLToken(content);
}
protected String toJSON() {
if (CLParser.DEBUG) {
return "<" + content() + ">";
} else {
return content();
}
}
protected String toFormattedJSON(int indent, int forceIndent) {
StringBuilder json = new StringBuilder();
addIndent(json, indent);
json.append(content());
return json.toString();
}
public Type getType() {
return type;
}
public boolean validate(char c, long position) {
boolean isValid = false;
switch (type) {
case TRUE: {
isValid = (tokenTrue[index] == c);
if (isValid && index + 1 == tokenTrue.length) {
setEnd(position);
}
} break;
case FALSE: {
isValid = (tokenFalse[index] == c);
if (isValid && index + 1 == tokenFalse.length) {
setEnd(position);
}
} break;
case NULL: {
isValid = (tokenNull[index] == c);
if (isValid && index + 1 == tokenNull.length) {
setEnd(position);
}
} break;
case UNKNOWN: {
if (tokenTrue[index] == c) {
type = Type.TRUE;
isValid = true;
} else if (tokenFalse[index] == c) {
type = Type.FALSE;
isValid = true;
} else if (tokenNull[index] == c) {
type = Type.NULL;
isValid = true;
}
}
}
index ++;
return isValid;
}
}