org.unlaxer.tinyexpression.parser.IfExpressionParser Maven / Gradle / Ivy

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TinyExpression implemented with Unlaxer
There is a newer version: 1.4.4
package org.unlaxer.tinyexpression.parser;

import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import org.unlaxer.Token;
import org.unlaxer.TokenPredicators;
import org.unlaxer.Token.ScanDirection;
import org.unlaxer.parser.Parser;
import org.unlaxer.parser.Parsers;
import org.unlaxer.parser.SuggestableParser;
import org.unlaxer.parser.ascii.LeftParenthesisParser;
import org.unlaxer.parser.ascii.RightParenthesisParser;
import org.unlaxer.parser.combinator.Choice;
import org.unlaxer.parser.elementary.WordParser;
import org.unlaxer.tinyexpression.parser.javalang.JavaStyleDelimitedLazyChain;
import org.unlaxer.util.annotation.TokenExtractor;
import org.unlaxer.util.annotation.TokenExtractor.Timing;

public abstract class IfExpressionParser extends JavaStyleDelimitedLazyChain {
    
  private static final long serialVersionUID = 8228933717392969866L;
  
  
  public IfExpressionParser() {
    super();
  }
  
  public static class IfFuctionNameParser extends SuggestableParser{

    private static final long serialVersionUID = -6045428101193616423L;

    public IfFuctionNameParser() {
      super(true, "if");
    }
  
    @Override
    public String getSuggestString(String matchedString) {
      return "(".concat(matchedString).concat("){ }else{ }");
    }
  }
  
  @Override
  public org.unlaxer.parser.Parsers getLazyParsers() {
    
    Parsers parsers = new Parsers(
      Parser.get(IfFuctionNameParser.class),
      Parser.get(LeftParenthesisParser.class),
      Parser.newInstance(BooleanExpressionParser.class).addTag(ExpressionTags.condition.tag()),//2
      Parser.get(RightParenthesisParser.class),
      Parser.get(LeftCurlyBraceParser.class),
   // if(condition){$variable}else{$variable}だった時にどちらかの変数が型指定をする事を求める
      new Choice(
          new JavaStyleDelimitedLazyChain() {

            @Override
            public Parsers getLazyParsers() {
              return Parsers.of(
                  Parser.newInstance(strictTypedReturning())
                    .addTag(ExpressionTags.returning.tag(),ExpressionTags.thenClause.tag()),
                  Parser.get(RightCurlyBraceParser.class),
                  Parser.get(()->new WordParser("else")),
                  Parser.get(LeftCurlyBraceParser.class),
                  Parser.newInstance(nonStrictTypedReturning())
                    .addTag(ExpressionTags.returning.tag(),ExpressionTags.elseClause.tag())
              );
            }
          }.addTag(ExpressionTags.thenAndElse.tag()),
          new JavaStyleDelimitedLazyChain() {

            @Override
            public Parsers getLazyParsers() {
              return Parsers.of(
                  Parser.newInstance(nonStrictTypedReturning())
                    .addTag(ExpressionTags.returning.tag(),ExpressionTags.thenClause.tag()),
                  Parser.get(RightCurlyBraceParser.class),
                  Parser.get(()->new WordParser("else")),
                  Parser.get(LeftCurlyBraceParser.class),
                  Parser.newInstance(strictTypedReturning())
                    .addTag(ExpressionTags.returning.tag(),ExpressionTags.elseClause.tag())

              );
            }
          }.addTag(ExpressionTags.thenAndElse.tag())
      ),
      Parser.get(RightCurlyBraceParser.class)
    );
    
    return parsers;
  }
  
  
  /* 
   */
  public abstract Class strictTypedReturning(); 
  public abstract Class nonStrictTypedReturning(); 
  
  @TokenExtractor(timings = {Timing.CreateOperatorOperandTree,Timing.UseOperatorOperandTree})
  public static Token getBooleanExpression(Token thisParserParsed) {
    return thisParserParsed.getChild(
        TokenPredicators.parserImplements(BooleanExpression.class , VariableParser.class)
    );
  }
  
  @TokenExtractor(timings = {Timing.CreateOperatorOperandTree,Timing.UseOperatorOperandTree})
  public static Token getThenExpression(Token thisParserParsed , 
      Class expressionInterfaceClass , Token conditionToken) {
    
    
    Predicate expressionFilter = 
        TokenPredicators.parserImplements(expressionInterfaceClass, VariableParser.class)
          .and(TokenPredicators.afterToken(conditionToken));
    
    List returning = thisParserParsed.flatten(ScanDirection.Breadth).stream()
      .filter(expressionFilter)
      .limit(2)
      .collect(Collectors.toList());
    
    return returning.get(0);
  }
  
  @TokenExtractor(timings = {Timing.CreateOperatorOperandTree,Timing.UseOperatorOperandTree})
  public static Token getElseExpression(Token thisParserParsed , 
      Class expressionInterfaceClass, Token conditionToken) {
    
    Predicate expressionFilter = 
        TokenPredicators.parserImplements(expressionInterfaceClass, VariableParser.class)
          .and(TokenPredicators.afterToken(conditionToken));

    List returning = thisParserParsed.flatten(ScanDirection.Breadth).stream()
        .filter(expressionFilter)
        .limit(2)
        .collect(Collectors.toList());
    
    return returning.get(1);
  }
  
  
  
}