Add substringBefore macro (WEB-30691)

java/java-tests/testSrc/com/intellij/java/codeInsight/template/LiveTemplateTest.groovy

@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2017 JetBrains s.r.o.
- *
- * 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.
- */
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.java.codeInsight.template
 
 import com.intellij.JavaTestUtil
@@ -525,7 +511,7 @@ class Outer {
   }
 
   void "_testIterForceBraces"() {
-    def settings = CodeStyleSettingsManager.getSettings(getProject()).getCommonSettings(JavaLanguage.INSTANCE);
+    def settings = CodeStyleSettingsManager.getSettings(getProject()).getCommonSettings(JavaLanguage.INSTANCE)
     settings.IF_BRACE_FORCE = CommonCodeStyleSettings.FORCE_BRACES_ALWAYS
 
     try {
@@ -1019,6 +1005,19 @@ class Foo {
     assert !state
     myFixture.checkResult('tableName tableNameID c')
   }
+  
+  void "test substringBefore macro"() {
+    final TemplateManager manager = TemplateManager.getInstance(getProject())
+    final Template template = manager.createTemplate("result", "user", '$A$ $B$ $C$')
+    template.addVariable('A', 'substringBefore("hello.world", ".")', '"empty"', false)
+    template.addVariable('B', 'substringBefore("hello world", ".")', '"empty"', false)
+    template.addVariable('C', 'substringBefore("hello world")', '"empty"', false)
+    myFixture.configureByText "a.txt", "<caret>"
+    startTemplate(template)
+    state.nextTab()
+    assert !state
+    myFixture.checkResult('hello empty empty')
+  }
 
   void "test snakeCase should convert hyphens to underscores"() {
     final TemplateManager manager = TemplateManager.getInstance(getProject())

platform/lang-impl/src/com/intellij/codeInsight/template/macro/SubstringBeforeMacro.java

@@ -0,0 +1,38 @@
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.codeInsight.template.macro;
+
+import com.intellij.codeInsight.template.Expression;
+import com.intellij.codeInsight.template.ExpressionContext;
+import com.intellij.codeInsight.template.Result;
+import com.intellij.codeInsight.template.TextResult;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class SubstringBeforeMacro extends MacroBase {
+  public SubstringBeforeMacro() {
+    super("substringBefore", "snakeCase(String, Delimiter)");
+  }
+
+  @Override
+  protected Result calculateResult(@NotNull Expression[] params, ExpressionContext context, boolean quick) {
+    if (params.length == 2) {
+      String string = getTextResult(params[0], context);
+      if (string == null) {
+        return null;
+      }
+      String delimiter = getTextResult(params[1], context);
+      if (delimiter == null) {
+        return null;
+      }
+      int indexOf = string.indexOf(delimiter);
+      return new TextResult(indexOf > 0 ? string.substring(0, indexOf) : "");
+    }
+    return null;
+  }
+
+  @Nullable
+  private static String getTextResult(@NotNull Expression param, ExpressionContext context) {
+    Result result = param.calculateResult(context);
+    return result != null ? result.toString() : null;
+  }
+}

platform/platform-resources/src/META-INF/LangExtensions.xml

@@ -511,6 +511,7 @@
     <liveTemplateMacro implementation="com.intellij.codeInsight.template.macro.CompleteMacro"/>
     <liveTemplateMacro implementation="com.intellij.codeInsight.template.macro.CompleteSmartMacro"/>
     <liveTemplateMacro implementation="com.intellij.codeInsight.template.macro.ClassNameCompleteMacro"/>
+    <liveTemplateMacro implementation="com.intellij.codeInsight.template.macro.SubstringBeforeMacro"/>
 
     <liveTemplateMacro implementation="com.intellij.codeInsight.template.macro.CommentMacro$LineCommentStart"/>
     <liveTemplateMacro implementation="com.intellij.codeInsight.template.macro.CommentMacro$BlockCommentStart"/>