五个类，解析单双引号
public interface IBlock { string Quote(); void Append(char c); bool ShouldAppendQuotedBlock(char c); }public abstract class NestedBlock : IBlock { private readonly NestedBlock parent; private readonly List<IBlock> blocks; private IBlock currentBlock; public NestedBlock(NestedBlock parent) { this.parent = parent; blocks = new List<IBlock>(); } public virtual string Quote() { StringBuilder stringBuilder = new StringBuilder(); foreach (IBlock block in blocks) { stringBuilder.Append(block.Quote()); } return stringBuilder.ToString(); } public abstract void Append(char c); public abstract bool ShouldAppendQuotedBlock(char c); protected NestedBlock Parent { get { return parent; } } protected IBlock CurrentBlock { get { return currentBlock; } } public void AppendBlock(IBlock block) { blocks.Add(block); currentBlock = block; } }
public class QuotedBlock : NestedBlock { private readonly IQuoteStrategy quoteStrategy; private readonly char expectedQuote; public QuotedBlock(IQuoteStrategy quoteStrategy, char expectedQuote, NestedBlock parent) : base(parent) { this.quoteStrategy = quoteStrategy; this.expectedQuote = expectedQuote; AppendBlock(new RootBlock(quoteStrategy)); } public override string Quote() { return expectedQuote + quoteStrategy.Quote(base.Quote()) + expectedQuote; } public override void Append(char c) { if (c == expectedQuote) { Parent.AppendBlock(new UnquotedBlock()); } else { CurrentBlock.Append(c); } } public override bool ShouldAppendQuotedBlock(char c) { return false; } }
public class UnquotedBlock : IBlock { private readonly StringBuilder stringBuilder = new StringBuilder(); public string Quote() { return stringBuilder.ToString(); } public void Append(char c) { stringBuilder.Append(c); } public bool ShouldAppendQuotedBlock(char c) { return IsQuotationMark(c); } private static bool IsQuotationMark(char c) { if (c == '"') { return true; } return c == '\''; } }
public class RootBlock : NestedBlock { private readonly IQuoteStrategy quoteStrategy; public RootBlock(IQuoteStrategy quoteStrategy) : base(null) { this.quoteStrategy = quoteStrategy; AppendBlock(new UnquotedBlock()); } public override void Append(char c) { if (CurrentBlock.ShouldAppendQuotedBlock(c)) { AppendBlock(new QuotedBlock(quoteStrategy, c, this)); } else { CurrentBlock.Append(c); } } public override bool ShouldAppendQuotedBlock(char c) { throw new ViScriptSystemException(); } }
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