com.github.dakusui.jcunit.regex.Printer Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jcunit Show documentation

Automated combinatorial testing framework on top of JUnit

There is a newer version: 0.8.17

package com.github.dakusui.jcunit.regex;

import java.io.PrintStream;

public class Printer implements Expr.Visitor {
  private final PrintStream ps;

  public Printer(PrintStream ps) {
    this.ps = ps;
  }

  @Override
  public void visit(Expr.Alt exp) {
    ps.print("(");
    try {
      boolean first = true;
      for (Expr each : exp.getChildren()) {
        if (!first) {
          ps.print("|");
        }
        each.accept(this);
        first = false;
      }
    } finally {
      ps.print(")");
    }
  }

  @Override
  public void visit(Expr.Cat exp) {
    boolean first = true;
    for (Expr each : exp.getChildren()) {
      if (!first) {
        ps.print(" ");
      }
      each.accept(this);
      first = false;
    }
  }

  @Override
  public void visit(Expr.Leaf leaf) {
    ps.print(leaf.value());
  }

  @Override
  public void visit(Expr.Empty empty) {
    ps.print(empty);
  }
}