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    • org.immutables.generator.Builtins Maven / Gradle / Ivy

    /*
   Copyright 2014 Immutables Authors and Contributors

   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 org.immutables.generator;

import com.google.common.base.CaseFormat;
import com.google.common.base.CharMatcher;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;

/**
 * Built-in operations, functions and accessors.
 * Planned to be moved to import/implicit resolution
 * rather that inheritance.
 */
public class Builtins {
  public final boolean $$true = true;
  public final boolean $$false = false;
  public final Void $$null = null;

  public final Predicate not =
      new Predicate() {
        @Override
        public boolean apply(Object input) {
          return !Intrinsics.$if(input);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".not";
        }
      };

  public final Predicate singular =
      new Predicate() {
        @Override
        public boolean apply(Object input) {
          return size.apply(input) == 1;
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".singular";
        }
      };

  public final Function size =
      new Function() {
        @Override
        public Integer apply(Object input) {
          if (input instanceof Map) {
            return ((Map) input).size();
          }
          if (input instanceof Iterable) {
            return Iterables.size((Iterable) input);
          }
          if (input instanceof CharSequence) {
            return ((CharSequence) input).length();
          }
          return 1;
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".size";
        }
      };

  public final Templates.Binary eq =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, Object right) {
          if (left instanceof String || right instanceof String) {
            return String.valueOf(left).equals(String.valueOf(right));
          }
          return Objects.equals(left, right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".eq";
        }
      };

  public final Templates.Binary eqref =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, Object right) {
          return left == right;
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".eq";
        }
      };

  public final Templates.Binary ne =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, Object right) {
          return !eq.apply(left, right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".ne";
        }
      };

  public final Templates.Binary and =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, Object right) {
          return Intrinsics.$if(left) && Intrinsics.$if(right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".and";
        }
      };

  public final Templates.Binary andnot =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, Object right) {
          return Intrinsics.$if(left) && !Intrinsics.$if(right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".andnot";
        }
      };

  public final Templates.Binary or =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, Object right) {
          return Intrinsics.$if(left) || Intrinsics.$if(right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".or";
        }
      };

  public final Templates.Binary ornot =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, Object right) {
          return Intrinsics.$if(left) || !Intrinsics.$if(right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".ornot";
        }
      };

  public final Templates.Binary startsWith =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, String right) {
          return left.toString().startsWith(right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".startsWith";
        }
      };

  public final Templates.Binary endsWith =
      new Templates.Binary() {
        @Override
        public Boolean apply(Object left, String right) {
          return left.toString().endsWith(right);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".endsWith";
        }
      };

  public final Templates.Binary, Boolean> in =
      new Templates.Binary, Boolean>() {
        @Override
        public Boolean apply(Object left, Collection right) {
          return right.contains(left);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".in";
        }
      };

  public final Templates.Binary, Boolean> notin =
      new Templates.Binary, Boolean>() {
        @Override
        public Boolean apply(Object left, Collection right) {
          return !right.contains(left);
        }

        @Override
        public String toString() {
          return Builtins.class.getSimpleName() + ".right";
        }
      };

  public final Literal literal = new Literal();

  public static final class Literal implements Function {

    @Override
    public String apply(Object input) {
      return StaticEnvironment.processing().getElementUtils().getConstantExpression(input);
    }

    public final Function string = new Function() {
      @Override
      public String apply(Object input) {
        return StringLiterals.toLiteral(String.valueOf(input));
      }
    };

    public final Function hex = new Function() {
      @Override
      public String apply(Number input) {
        if (input instanceof Long) {
          return "0x" + Long.toHexString(input.longValue()) + "L";
        }
        if (input instanceof Integer) {
          return "0x" + Integer.toHexString(input.intValue());
        }
        throw new IllegalArgumentException("unsupported non integer or long " + input);
      }

      @Override
      public String toString() {
        return Literal.this.toString() + ".hex";
      }
    };

    public final Function bin = new Function() {
      @Override
      public String apply(Number input) {
        if (input instanceof Long) {
          return "0b" + Long.toBinaryString(input.longValue()) + "L";
        }
        if (input instanceof Integer) {
          return "0b" + Integer.toBinaryString(input.intValue());
        }
        throw new IllegalArgumentException("unsupported non integer or long " + input);
      }

      @Override
      public String toString() {
        return Literal.this.toString() + ".bin";
      }
    };

    @Override
    public String toString() {
      return Builtins.class.getSimpleName() + ".literal";
    }
  }

  public final Function emptyIfZero = new Function() {
    @Override
    public String apply(Integer input) {
      return input == 0 ? "" : input.toString();
    }
  };

  public final Function toUpper =
      Functions.compose(
          CaseFormat.LOWER_CAMEL.converterTo(CaseFormat.UPPER_CAMEL),
          Functions.toStringFunction());

  public final Function toLower =
      Functions.compose(
          CaseFormat.UPPER_CAMEL.converterTo(CaseFormat.LOWER_CAMEL),
          Functions.toStringFunction());

  public final Function toConstant =
      Functions.compose(
          CaseFormat.LOWER_CAMEL.converterTo(CaseFormat.UPPER_UNDERSCORE),
          Functions.toStringFunction());

  // Does it belongs here?
  public final Function toSafeIdentifier = new Function() {
    private final CharMatcher digits = CharMatcher.inRange('0', '9');
    private final CharMatcher nonIdentifierChars =
        CharMatcher.is('_')
            .or(digits)
            .or(CharMatcher.inRange('a', 'z'))
            .or(CharMatcher.inRange('A', 'Z'))
            .negate();

    @Override
    public String apply(Object input) {
      String inputString = String.valueOf(input);
      if (inputString.isEmpty()) {
        return "_";
      }
      String safeString = nonIdentifierChars.replaceFrom(inputString, '_');
      if (digits.matches(safeString.charAt(0))) {
        return "_" + safeString;
      }
      return safeString;
    }

    @Override
    public String toString() {
      return Builtins.class.getSimpleName() + ".toSafeIdentifier";
    }
  };
}
    
    
    
    

    




    
    
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