com.igormaznitsa.jcp.expression.functions.FunctionSTR2WEB.java Source code

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Here is the source code for com.igormaznitsa.jcp.expression.functions.FunctionSTR2WEB.java

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/* 
 * Copyright 2014 Igor Maznitsa (http://www.igormaznitsa.com).
 *
 * 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 com.igormaznitsa.jcp.expression.functions;

import javax.annotation.Nonnull;

import com.igormaznitsa.jcp.context.PreprocessorContext;
import com.igormaznitsa.jcp.expression.Value;
import com.igormaznitsa.jcp.expression.ValueType;

import org.apache.commons.lang3.CharUtils;
import org.apache.commons.lang3.StringEscapeUtils;

/**
 * The class implements the str2web function handler
 *
 * @author Igor Maznitsa (igor.maznitsa@igormaznitsa.com)
 */
public final class FunctionSTR2WEB extends AbstractStrConverter {

    @Override
    @Nonnull
    public String getName() {
        return "str2web";
    }

    @Override
    @Nonnull
    public Value executeStr(@Nonnull final PreprocessorContext context, @Nonnull final Value value) {
        final String escaped = StringEscapeUtils.escapeHtml3(value.asString());

        final StringBuilder result = new StringBuilder(escaped.length() * 2);
        for (int i = 0; i < escaped.length(); i++) {
            final char ch = escaped.charAt(i);
            if (CharUtils.isAscii(ch)) {
                result.append(ch);
            } else {
                result.append("&#").append(Integer.toString(Character.codePointAt(escaped, i))).append(';');
            }
        }

        return Value.valueOf(result.toString());
    }

    @Override
    @Nonnull
    public String getReference() {
        return "escape string for HTML3";
    }

    @Override
    @Nonnull
    public ValueType getResultType() {
        return ValueType.STRING;
    }
}