StringReader部分

2020-12-18 18:12:47 +08:00
parent 9484b3c098
commit 9a0e925f6e
13 changed files with 338 additions and 28 deletions
--- a/src/Reader/StringReader.php
+++ b/src/Reader/StringReader.php
@ -0,0 +1,124 @@
+<?php
+/**
+ * @filename StringReader.php
+ * @author Jerry Yan <792602257@qq.com>
+ * @date 2020/12/17 14:58
+ */
+
+
+namespace JerryYan\DSL\Reader;
+
+
+class StringReader extends ReaderInterface
+{
+    protected $string;
+    protected $currentToken;
+
+    public function __construct(string $string)
+    {
+        $this->string = $string;
+        $this->moveToNextToken();
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getNextChar(int $startAt = null): string
+    {
+        if ($startAt === null) $startAt = $this->currentPosition;
+        return mb_substr($this->string, $startAt, 1);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getCurrentToken(): string
+    {
+        return $this->currentToken;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getNextToken(): string
+    {
+        $curToken = "";
+        $curPos = $this->nextPosition;
+        while ($curChar = $this->getNextChar($curPos)) {
+            switch ($curChar) {
+                case " ":
+                    // 如果开始的时候就有空白，跳过它
+                    if (empty($curToken)) {
+                        continue 2;
+                    }
+                    // 否则就结束（已经匹配完成）
+                    break 2;
+                case "\r":
+                case "\n":
+                    break 2;
+                default:
+                    $curToken .= $curChar;
+            }
+        }
+        return $curToken;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function moveToNextToken(): bool
+    {
+        $curToken = "";
+        $this->currentPosition = $this->nextPosition;
+        while ($curChar = $this->getNextChar($this->nextPosition)) {
+            $this->nextPosition++;
+            $this->currentLinePosition++;
+            switch ($curChar) {
+                case " ":
+                    // 如果开始的时候就有空白，跳过它
+                    if (empty($curToken)) {
+                        $this->currentPosition++;
+                        continue 2;
+                    }
+                    // 否则就结束（已经匹配完成）
+                    break 2;
+                case "\r":
+                    if ($this->getNextChar($this->nextPosition+1) === "\n") {
+                        // CRLF换行
+                        $this->nextPosition+=2;
+                    }
+                    // CR换行
+                    $this->currentLine++;
+                    $this->currentLinePosition=0;
+                    break 2;
+                case "\n":
+                    // LF换行
+                    $this->currentLine++;
+                    $this->currentLinePosition=0;
+                    break 2;
+                default:
+                    $curToken .= $curChar;
+            }
+        }
+        $this->currentToken = $curToken;
+        return true;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function skipCurrentLine(): bool
+    {
+        // TODO: Implement skipCurrentLine() method.
+        return true;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function skipUntil(string $end = "*/"): bool
+    {
+        // TODO: Implement skipUntil() method.
+        return true;
+    }
+}