jaskell.parsec.common.UDecimal Maven / Gradle / Ivy

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package jaskell.parsec.common;

import jaskell.parsec.ParsecException;
import javafx.util.Builder;

import java.io.EOFException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Mars Liu on 2016-01-07.
 * UDecimal 尝试将后续信息流解析成一个表示无符号浮点数的字符串,如果匹配失败就抛出异常.
 */
public class UDecimal
    implements Parsec {
  private final Parsec uint = new UInt();
  private final Parsec dot = new Try<>(new Ch('.'));

  @Override
  public String parse(State s)
      throws EOFException, ParsecException {
    StringBuilder builder = new StringBuilder();
    builder.append(uint.parse(s));
    if(dot.exec(s).isOk()){
      builder.append('.');
      builder.append(uint.parse(s));
    }
    return builder.toString();
  }
}