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org.openapitools.codegen.templating.mustache.IndentedLambda Maven / Gradle / Ivy

/*
 * 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 com.samskivert.mustache.Mustache;
import com.samskivert.mustache.Template;
import org.apache.commons.lang3.StringUtils;

import java.io.IOException;
import java.io.Writer;

/**
 * This naively prepends indention to all lines of a fragment.
 * 

* Generator authors may add helpers for explicitly adding prefixed spaces which fragments won't be aware of. *

* Register: *

 * additionalProperties.put("indent4", new IndentedLambda(4));
 * additionalProperties.put("indent8", new IndentedLambda(8));
 * 
*

* Use: *

{@code
 *     {{#indent4}}{{>template}}{{/indent4}}
 *         {{#indent8}}{{>other_template}}{{/indent8}}
 * }
*/ public class IndentedLambda implements Mustache.Lambda { private final int prefixSpaceCount; private final String prefix; private int spaceCode; /** * Constructs a new instance of {@link IndentedLambda}, with an indent count of 4 spaces */ public IndentedLambda() { this(4, " ", null); } /** * Constructs a new instance of {@link IndentedLambda}, with customized indent count and intention character * * @param prefixSpaceCount The number of indented characters to apply as a prefix to a fragment. * @param indentionCharacter String representation of the character used in the indent (e.g. " ", "\t", "."). */ public IndentedLambda(int prefixSpaceCount, String indentionCharacter) { this(prefixSpaceCount, Character.codePointAt(indentionCharacter, 0), null); } /** * Constructs a new instance of {@link IndentedLambda}, with customized indent count and intention character * * @param prefixSpaceCount The number of indented characters to apply as a prefix to a fragment. * @param indentionCharacter String representation of the character used in the indent (e.g. " ", "\t", "."). * @param prefix An optional prefix to prepend before the line (useful for multi-line comments). */ public IndentedLambda(int prefixSpaceCount, String indentionCharacter, String prefix) { this(prefixSpaceCount, Character.codePointAt(indentionCharacter, 0), prefix); } /** * Constructs a new instance of {@link IndentedLambda} * * @param prefixSpaceCount The number of indented characters to apply as a prefix to a fragment. * @param indentionCodePoint Code point of the single character used for indentation. */ private IndentedLambda(int prefixSpaceCount, int indentionCodePoint) { this(prefixSpaceCount, indentionCodePoint, null); } /** * Constructs a new instance of {@link IndentedLambda} * * @param prefixSpaceCount The number of indented characters to apply as a prefix to a fragment. * @param indentionCodePoint Code point of the single character used for indentation. * @param prefix An optional prefix to prepend before the line (useful for multi-line comments). */ private IndentedLambda(int prefixSpaceCount, int indentionCodePoint, String prefix) { if (prefixSpaceCount <= 0) { throw new IllegalArgumentException("prefixSpaceCount must be greater than 0"); } if (!Character.isValidCodePoint(indentionCodePoint)) { throw new IllegalArgumentException("indentionCodePoint is an invalid code point "); } this.prefixSpaceCount = prefixSpaceCount; this.spaceCode = indentionCodePoint; this.prefix = prefix; } @Override public void execute(Template.Fragment fragment, Writer writer) throws IOException { String text = fragment.execute(); if (text == null || text.length() == 0) { return; } String prefixedIndention = StringUtils.repeat(new String(Character.toChars(spaceCode)), prefixSpaceCount); StringBuilder sb = new StringBuilder(); String[] lines = text.split(System.lineSeparator()); for (int i = 0; i < lines.length; i++) { String line = lines[i]; // Mustache will apply correct indentation to the first line of a template (to match declaration location). // So, we want to skip the first line. if (i > 0) { sb.append(prefixedIndention); if (prefix != null) sb.append(prefix); } sb.append(line); // We've split on the system's line separator. We don't want to add an additional trailing line. if (i < lines.length - 1) { sb.append(System.lineSeparator()); } } writer.write(sb.toString()); } }




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