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Added a new lambda to split long fragments into compilable strings
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104 changes: 104 additions & 0 deletions
104
...nerator/src/main/java/org/openapitools/codegen/templating/mustache/SplitStringLambda.java
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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 | ||
* | ||
* 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. | ||
*/ | ||
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package org.openapitools.codegen.templating.mustache; | ||
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import java.io.IOException; | ||
import java.io.Writer; | ||
import java.util.Locale; | ||
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import com.samskivert.mustache.Mustache; | ||
import com.samskivert.mustache.Template.Fragment; | ||
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/** | ||
* Splits long fragments into smaller strings and uses a StringBuilder to merge | ||
* them back. | ||
* | ||
* Register: | ||
* | ||
* <pre> | ||
* additionalProperties.put("lambdaSplitString", new SplitStringLambda()); | ||
* </pre> | ||
* | ||
* Use: | ||
* | ||
* <pre> | ||
* {{#lambdaSplitString}}{{summary}}{{/lambdaSplitString}} | ||
* </pre> | ||
*/ | ||
public class SplitStringLambda implements Mustache.Lambda { | ||
private static final int DEFAULT_MAX_LENGTH = 65535; | ||
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private static final String SPLIT_INIT = "new StringBuilder(%d)"; | ||
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private static final String SPLIT_PART = ".append(\"%s\")"; | ||
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private static final String SPLIT_SUFFIX = ".toString()"; | ||
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private final int maxLength; | ||
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public SplitStringLambda() { | ||
this(DEFAULT_MAX_LENGTH); | ||
} | ||
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public SplitStringLambda(int maxLength) { | ||
this.maxLength = maxLength; | ||
} | ||
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@Override | ||
public void execute(Fragment fragment, Writer writer) throws IOException { | ||
String input = fragment.execute(); | ||
int inputLength = input.length(); | ||
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StringBuilder builder = new StringBuilder(); | ||
if (inputLength > maxLength) { | ||
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// Initialize a StringBuilder | ||
builder.append(String.format(Locale.ROOT, SPLIT_INIT, inputLength)); | ||
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int currentPosition = 0; | ||
int currentStringLength = 0; | ||
char currentLastChar = '\\'; | ||
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// 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; | ||
} | ||
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builder.append(String.format(Locale.ROOT, SPLIT_PART, input.substring(currentPosition, currentPosition + currentStringLength))); | ||
currentPosition += currentStringLength; | ||
} | ||
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// Append last part if necessary | ||
if (currentPosition < input.length()) { | ||
builder.append(String.format(Locale.ROOT, SPLIT_PART, input.substring(currentPosition))); | ||
} | ||
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// Close the builder and merge everything back to a string | ||
builder.append(SPLIT_SUFFIX); | ||
} else { | ||
builder.append(String.format(Locale.ROOT, "\"%s\"", input)); | ||
} | ||
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writer.write(builder.toString()); | ||
} | ||
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} |
106 changes: 106 additions & 0 deletions
106
...tor/src/test/java/org/openapitools/codegen/templating/mustache/SplitStringLambdaTest.java
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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 | ||
* | ||
* 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. | ||
*/ | ||
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package org.openapitools.codegen.templating.mustache; | ||
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import static org.mockito.Mockito.when; | ||
import static org.testng.Assert.assertEquals; | ||
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import java.io.IOException; | ||
import java.io.StringWriter; | ||
import java.util.HashMap; | ||
import java.util.Locale; | ||
import java.util.Map; | ||
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import org.mockito.Mock; | ||
import org.mockito.Mockito; | ||
import org.mockito.MockitoAnnotations; | ||
import org.testng.annotations.AfterMethod; | ||
import org.testng.annotations.BeforeMethod; | ||
import org.testng.annotations.Test; | ||
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import com.samskivert.mustache.Template.Fragment; | ||
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public class SplitStringLambdaTest { | ||
private static final String INPUT_STRING = "1112223334"; | ||
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private static final Map<Integer, String> EXPECTED_OUTPUTS; | ||
static { | ||
EXPECTED_OUTPUTS = new HashMap<>(); | ||
EXPECTED_OUTPUTS.put(2, | ||
String.format( | ||
Locale.ROOT, | ||
"new StringBuilder(%d).append(\"11\").append(\"12\").append(\"22\").append(\"33\").append(\"34\").toString()", | ||
INPUT_STRING.length())); | ||
EXPECTED_OUTPUTS.put(3, | ||
String.format( | ||
Locale.ROOT, | ||
"new StringBuilder(%d).append(\"111\").append(\"222\").append(\"333\").append(\"4\").toString()", | ||
INPUT_STRING.length())); | ||
} | ||
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private static final String INPUT_QUOTED_STRING = "1\\\"11\\\"2223\\\"334"; | ||
private static final String INPUT_QUOTED_OUTPUT = String.format( | ||
Locale.ROOT, | ||
"new StringBuilder(%d).append(\"1\\\"\").append(\"11\").append(\"\\\"2\").append(\"223\").append(\"\\\"3\").append(\"34\").toString()", | ||
INPUT_QUOTED_STRING.length()); | ||
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@Mock | ||
private Fragment fragment; | ||
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@BeforeMethod | ||
public void init() { | ||
MockitoAnnotations.initMocks(this); | ||
} | ||
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@AfterMethod | ||
public void reset() { | ||
Mockito.reset(fragment); | ||
} | ||
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private void testString(String input, int maxLength, String expected) throws IOException { | ||
when(fragment.execute()).thenReturn(input); | ||
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StringWriter output = new StringWriter(); | ||
new SplitStringLambda(maxLength).execute(fragment, output); | ||
assertEquals(output.toString(), expected); | ||
} | ||
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@Test | ||
public void testSplitGroupsOf2() throws IOException { | ||
int maxLength = 2; | ||
testString(INPUT_STRING, maxLength, EXPECTED_OUTPUTS.get(maxLength)); | ||
} | ||
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@Test | ||
public void testSplitGroupsOf3() throws IOException { | ||
int maxLength = 3; | ||
testString(INPUT_STRING, maxLength, EXPECTED_OUTPUTS.get(maxLength)); | ||
} | ||
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@Test | ||
public void testSplitQuotedString() throws IOException { | ||
int maxLength = 3; | ||
testString(INPUT_QUOTED_STRING, maxLength, INPUT_QUOTED_OUTPUT); | ||
} | ||
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@Test | ||
public void testShortString() throws IOException { | ||
testString(INPUT_STRING, INPUT_STRING.length(), String.format(Locale.ROOT, "\"%s\"", INPUT_STRING)); | ||
} | ||
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} |