Added parsing conveyor class. Not used

Author: ProgMiner

app/Parsing/Conveyor.php

@@ -0,0 +1,171 @@
+<?php
+
+/* MIT License
+
+Copyright (c) 2018 Eridan Domoratskiy
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE. */
+
+namespace PHPDataGen\Parsing;
+
+/**
+ * Parsing conveyor
+ */
+class Conveyor {
+
+    /**
+     * @var string Next string
+     */
+    protected $next = null;
+
+    /**
+     * @var int Current cursor line
+     */
+    protected $line = 0;
+
+    /**
+     * @var int Current cursor row
+     */
+    protected $row = 0;
+
+    /**
+     * @param string $source Source of conveyor
+     */
+    public function __construct(string $source) {
+        $this->next = $source;
+    }
+
+    /**
+     * Moves conveyor on specified offset.
+     * Offset must be pozitive (or null)
+     *
+     * @param int $offset Pozitive offset
+     */
+    public function move(int $offset) {
+        if ($offset < 0) {
+            throw new \OutOfRangeException("Offset must be pozitive");
+        }
+
+        for ($i = 0; $i < $offset; ++$i) {
+            if ($this->next[$i] == "\n") {
+                $this->row = 0;
+                ++$this->line;
+            } else {
+                ++$this->row;
+            }
+        }
+
+        $this->next = substr($this->next, $offset);
+    }
+
+    /**
+     * Tries to read operator.
+     * If required is true throws Exception
+     *
+     * @param string $operator Operator
+     * @param bool   $required Is operator required? Default is false
+     *
+     * @return Operator finded
+     */
+    public function readOperator(string $operator, bool $required = false): bool {
+        if (strpos($this->next, $operator) === 0) {
+            $this->move(strlen($operator));
+            return true;
+        }
+
+        if ($required) {
+            throw new \Exception("$operator not found at {$this->line} line {$this->row} row");
+        }
+
+        return false;
+    }
+
+    /**
+     * Moves conveyor to next not-space symbol
+     */
+    public function skipSpaces() {
+        if (preg_match('/^\s*/', $this->next, $matches) === 1) {
+            $this->move(strlen($matches[0]));
+        }
+    }
+
+    /**
+     * Reads namespace (Foo\Bar\Baz sequence) from parser conveyor
+     * Shifts parser coveyor on namespace length
+     *
+     * @return string Namespace
+     */
+    public function readNamespace(): string {
+        if (preg_match('/^[a-z_][\w\\]*\w/i', $this->next, $matches) === 1) {
+            $this->move(strlen($matches[0]));
+
+            return $matches[0];
+        }
+
+        throw new \Exception('Namespace not found');
+    }
+
+    /**
+     * Reads class name from parser conveyor
+     * Shifts parser coveyor on class name length
+     *
+     * @return string Class name
+     */
+    public function readClassname(): string {
+        if (preg_match('/^[a-z_]\w*/i', $this->next, $matches) === 1) {
+            $this->move(strlen($matches[0]));
+
+            return $matches[0];
+        }
+
+        throw new \Exception('Class name not found');
+    }
+
+    /**
+     * Reads extended class name (\Foo\Bar\Baz sequence or regular) from parser conveyor
+     * Shifts parser coveyor on extended class name length
+     *
+     * @return string Extended class name
+     */
+    public function readExtendedClassname(): string {
+        if (preg_match('/^(\\[a-z_]\w*)+/i', $this->next, $matches) === 1) {
+            $this->move(strlen($matches[0]));
+
+            return $matches[0];
+        }
+
+        return static::readClassname($next);
+    }
+
+    /**
+     * Reads semicolon from parser conveyor
+     * Shifts parser coveyor on one symbol
+     */
+    public function readSemicolon() {
+        if ($this->readOperator(';')) {
+            return;
+        }
+
+        throw new \Exception('Semicolon not found');
+    }
+
+    public function __toString() {
+        return $this->next;
+    }
+}