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/*
 * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
 * Copyright 2018 SmartBear Software
 *
 * 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
 *
 *     https://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 org.openapitools.codegen.templating.mustache;

import java.io.IOException;
import java.io.Writer;
import java.util.Locale;

import com.samskivert.mustache.Mustache;
import com.samskivert.mustache.Template.Fragment;

/**
 * Splits long fragments into smaller strings and uses a StringBuilder to merge
 * them back.
 *
 * Register:
 *
 * 
 * additionalProperties.put("lambdaSplitString", new SplitStringLambda());
 * 
* * Use: * *
 * {{#lambdaSplitString}}{{summary}}{{/lambdaSplitString}}
 * 
*/ public class SplitStringLambda implements Mustache.Lambda { private static final int DEFAULT_MAX_LENGTH = 65535; private static final String SPLIT_INIT = "new StringBuilder(%d)"; private static final String SPLIT_PART = ".append(\"%s\")"; private static final String SPLIT_SUFFIX = ".toString()"; private final int maxLength; public SplitStringLambda() { this(DEFAULT_MAX_LENGTH); } public SplitStringLambda(int maxLength) { this.maxLength = maxLength; } @Override public void execute(Fragment fragment, Writer writer) throws IOException { String input = fragment.execute(); int inputLength = input.length(); StringBuilder builder = new StringBuilder(); if (inputLength > maxLength) { // Initialize a StringBuilder builder.append(String.format(Locale.ROOT, SPLIT_INIT, inputLength)); int currentPosition = 0; int currentStringLength = 0; char currentLastChar = '\\'; // Split input into parts of at most maxLength and not ending with an escape character // Append each part to the StringBuilder while (currentPosition + maxLength < input.length()) { currentStringLength = maxLength; currentLastChar = input.charAt(currentPosition + currentStringLength - 1); if (currentLastChar == '\\') { --currentStringLength; } builder.append(String.format(Locale.ROOT, SPLIT_PART, input.substring(currentPosition, currentPosition + currentStringLength))); currentPosition += currentStringLength; } // Append last part if necessary if (currentPosition < input.length()) { builder.append(String.format(Locale.ROOT, SPLIT_PART, input.substring(currentPosition))); } // Close the builder and merge everything back to a string builder.append(SPLIT_SUFFIX); } else { builder.append(String.format(Locale.ROOT, "\"%s\"", input)); } writer.write(builder.toString()); } }




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