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RegularPrinter.cs
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120 lines (107 loc) · 2.49 KB
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using UnityEngine;
using Xtaieer.Regular;
using System.Text;
public class RegularPrinter : IRegularExpressionVisitor
{
StringBuilder sb = new StringBuilder();
void IRegularExpressionVisitor.Closure(IRegularExpression operand)
{
bool isLeaf = operand is LeafExpression;
if(!isLeaf)
{
Print('(');
operand.Accept(this);
Print(')');
}
else
{
operand.Accept(this);
}
Print('*');
}
void IRegularExpressionVisitor.Concat(IRegularExpression lhs, IRegularExpression rhs)
{
bool isLeftOr = lhs is OrExpression;
bool isRightOr = rhs is OrExpression;
if(isLeftOr)
{
Print('(');
lhs.Accept(this);
Print(')');
}
else
{
lhs.Accept(this);
}
if(isRightOr)
{
Print('(');
rhs.Accept(this);
Print(')');
}
else
{
rhs.Accept(this);
}
}
void IRegularExpressionVisitor.Epsilon()
{
}
void IRegularExpressionVisitor.Or(IRegularExpression lhs, IRegularExpression rhs)
{
lhs.Accept(this);
Print('|');
rhs.Accept(this);
}
void IRegularExpressionVisitor.RangeCharLeaf(char from, char to)
{
Print("[" + from + "-" + to + "]");
}
void IRegularExpressionVisitor.SingleCharLeaf(char c)
{
Print(c);
}
void IRegularExpressionVisitor.QuestionMark(IRegularExpression operand)
{
bool isLeaf = operand is LeafExpression;
if (!isLeaf)
{
Print('(');
operand.Accept(this);
Print(')');
}
else
{
operand.Accept(this);
}
Print('?');
}
void IRegularExpressionVisitor.PositiveClosure(IRegularExpression operand)
{
bool isLeaf = operand is LeafExpression;
if (!isLeaf)
{
Print('(');
operand.Accept(this);
Print(')');
}
else
{
operand.Accept(this);
}
Print('+');
}
void Print(char c)
{
sb.Append(c);
}
void Print(string str)
{
sb.Append(str);
}
public void Result()
{
Debug.Log(sb.ToString());
sb.Clear();
}
}