com.igormaznitsa.jcp.expression.functions.FunctionSTR2JAVA Maven / Gradle / Ivy

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Powerful multi-pass preprocessor to process directives situated in C-styled commentaries

There is a newer version: 7.1.2

/* 
 * 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 com.igormaznitsa.jcp.utils.PreprocessorUtils;

import org.apache.commons.lang3.StringEscapeUtils;

import com.igormaznitsa.meta.annotation.MustNotContainNull;

/**
 * The class implements escape function handler to escape strings to be used in java.
 *
 * @author Igor Maznitsa ([email protected])
 */
public final class FunctionSTR2JAVA extends AbstractFunction {

  private static final ValueType[][] ARG_TYPES = new ValueType[][]{{ValueType.STRING, ValueType.BOOLEAN}};

  @Override
  @Nonnull
  public String getName() {
    return "str2java";
  }

  @Nonnull
  public Value executeStrBool(@Nonnull final PreprocessorContext context, @Nonnull final Value source, @Nonnull final Value splitAndQuoteLines) {
    if (splitAndQuoteLines.asBoolean()){
      final boolean endsWithNextLine = source.asString().endsWith("\n");
      final String [] splitted = PreprocessorUtils.splitForCharAndHoldEmptyLine(source.asString(),'\n');
      final StringBuilder result = new StringBuilder(source.asString().length()*2);
      final String nextLineChars = PreprocessorUtils.getNextLineCodes();
      
      int index = 0;
      for(final String s : splitted){
        final boolean last = ++index == splitted.length;
        if (result.length()>0){
          result.append(nextLineChars).append('+');
        }
        result.append('\"').append(StringEscapeUtils.escapeJava(s));
        if (last ){
          result.append(endsWithNextLine ? "\\n\"":"\"");
        }else{
          result.append("\\n\"");
        }
      }
      return Value.valueOf(result.toString());
    }else{
      return Value.valueOf(StringEscapeUtils.escapeJava(source.asString()));
    }
  }

  @Override
  public int getArity() {
    return 2;
  }

  @Override
  @Nonnull
  @MustNotContainNull
  public ValueType[][] getAllowedArgumentTypes() {
    return ARG_TYPES;
  }

  @Override
  @Nonnull
  public String getReference() {
    return "escapes a string to be compatible with java";
  }

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

}