更换成链表结构

src/Token/Token.php

@@ -19,4 +19,5 @@ final class Token
 {
     const AND = "And";
     const OR = "Or";
+    const VAR = "Var";
 }

src/Token/TokenDefine.php

@@ -0,0 +1,15 @@
+<?php
+/**
+ * @filename TokenDefine.php
+ * @author Jerry Yan <792602257@qq.com>
+ * @date 2021/1/22 9:41
+ */
+
+
+namespace JerryYan\DSL\Token;
+
+
+class TokenDefine extends TokenInterface
+{
+
+}

src/Token/TokenFactory.php

@@ -15,6 +15,7 @@ class TokenFactory
     private $tokenMap = [
         Token::AND => TokenAnd::class,
         Token::OR => TokenOr::class,
+        Token::VAR => TokenVar::class,
     ];
 
     protected $tokenNameMap = [
@@ -23,13 +24,14 @@ class TokenFactory
 
     public function getTokenByName(string $name): TokenInterface
     {
-        if (!isset($this->tokenNameMap[$name])) {
-            return new TokenUndefined();
+        $originalName = $name;
+        if (isset($this->tokenNameMap[$name])) {
+            $name = $this->tokenNameMap[$name];
         }
-        $tokenType = $this->tokenNameMap[$name];
-        if (!isset($this->tokenMap[$tokenType])) {
-            return new TokenUndefined();
+        if (!isset($this->tokenMap[$name])) {
+            return new TokenUndefined($originalName);
+        } else {
+            return new $this->tokenMap[$name]($originalName);
         }
-        return new $this->tokenMap[$tokenType];
     }
 }

src/Token/TokenInterface.php

@@ -11,5 +11,55 @@ namespace JerryYan\DSL\Token;
 
 abstract class TokenInterface
 {
+    /** @var ?TokenInterface 上一个Token */
+    protected $prevToken;
+    /** @var ?TokenInterface 下一个Token */
+    protected $nextToken=NULL;
+    /** @var string 原始数据 */
+    protected $_raw = "";
 
+    public function __construct(string $original)
+    {
+        $this->_raw = $original;
+    }
+
+    public function setPrevToken(?TokenInterface $token): void
+    {
+        $this->prevToken = $token;
+    }
+    public function setNextToken(TokenInterface $token): void
+    {
+        $this->nextToken = $token;
+    }
+
+    /**
+     * 获取链表第一个元素
+     * @return ?$this
+     * @author Jerry Yan <792602257@qq.com>
+     * @date 2021/1/22 10:01
+     */
+    public function getFirstToken(): ?TokenInterface
+    {
+        if ($this->hasPrevToken()) return $this->prevToken->getFirstToken();
+        else return $this;
+    }
+    public function getLastToken(): ?TokenInterface
+    {
+        if ($this->hasNextToken()) return $this->nextToken->getLastToken();
+        else return $this;
+    }
+    public function hasPrevToken(): bool
+    {
+        return $this->prevToken !== NULL;
+    }
+    public function hasNextToken(): bool
+    {
+        return $this->nextToken !== NULL;
+    }
+    public function getPrevToken(): ?TokenInterface{
+        return $this->prevToken;
+    }
+    public function getNextToken(): ?TokenInterface{
+        return $this->nextToken;
+    }
 }

src/Token/TokenVar.php

@@ -0,0 +1,15 @@
+<?php
+/**
+ * @filename TokenVar.php
+ * @author Jerry Yan <792602257@qq.com>
+ * @date 2021/1/22 9:41
+ */
+
+
+namespace JerryYan\DSL\Token;
+
+
+class TokenVar extends TokenInterface
+{
+
+}