From f7bfdf58def6aadc922e1632f407d1418269a0d7 Mon Sep 17 00:00:00 2001
From: Evgeny Zinoviev <me@ch1p.io>
Date: Sat, 9 Jul 2022 19:40:17 +0300
Subject: initial

---
 engine/Router.php | 165 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 engine/Router.php

(limited to 'engine/Router.php')

diff --git a/engine/Router.php b/engine/Router.php
new file mode 100644
index 0000000..0cb761d
--- /dev/null
+++ b/engine/Router.php
@@ -0,0 +1,165 @@
+<?php
+
+class Router {
+
+    protected array $routes = [
+        'children' => [],
+        're_children' => []
+    ];
+
+    public function add($template, $value) {
+        if ($template == '')
+            return $this;
+
+        // expand {enum,erat,ions}
+        $templates = [[$template, $value]];
+        if (preg_match_all('/\{([\w\d_\-,]+)\}/', $template, $matches)) {
+            foreach ($matches[1] as $match_index => $variants) {
+                $variants = explode(',', $variants);
+                $variants = array_map('trim', $variants);
+                $variants = array_filter($variants, function($s) { return $s != ''; });
+
+                for ($i = 0; $i < count($templates); ) {
+                    list($template, $value) = $templates[$i];
+                    $new_templates = [];
+                    foreach ($variants as $variant_index => $variant) {
+                        $new_templates[] = [
+                            str_replace_once($matches[0][$match_index], $variant, $template),
+                            str_replace('${'.($match_index+1).'}', $variant, $value)
+                        ];
+                    }
+                    array_splice($templates, $i, 1, $new_templates);
+                    $i += count($new_templates);
+                }
+            }
+        }
+
+        // process all generated routes
+        foreach ($templates as $template) {
+            list($template, $value) = $template;
+
+            $start_pos = 0;
+            $parent = &$this->routes;
+            $template_len = strlen($template);
+
+            while ($start_pos < $template_len) {
+                $slash_pos = strpos($template, '/', $start_pos);
+                if ($slash_pos !== false) {
+                    $part = substr($template, $start_pos, $slash_pos-$start_pos+1);
+                    $start_pos = $slash_pos+1;
+                } else {
+                    $part = substr($template, $start_pos);
+                    $start_pos = $template_len;
+                }
+
+                $parent = &$this->_addRoute($parent, $part,
+                    $start_pos < $template_len ? null : $value);
+            }
+        }
+
+        return $this;
+    }
+
+    protected function &_addRoute(&$parent, $part, $value = null) {
+        $par_pos = strpos($part, '(');
+        $is_regex = $par_pos !== false && ($par_pos == 0 || $part[$par_pos-1] != '\\');
+
+        $children_key = !$is_regex ? 'children' : 're_children';
+
+        if (isset($parent[$children_key][$part])) {
+            if (is_null($value)) {
+                $parent = &$parent[$children_key][$part];
+            } else {
+                if (!isset($parent[$children_key][$part]['value'])) {
+                    $parent[$children_key][$part]['value'] = $value;
+                } else {
+                    trigger_error(__METHOD__.': route is already defined');
+                }
+            }
+            return $parent;
+        }
+
+        $child = [
+            'children' => [],
+            're_children' => []
+        ];
+        if (!is_null($value))
+            $child['value'] = $value;
+
+        $parent[$children_key][$part] = $child;
+        return $parent[$children_key][$part];
+    }
+
+    public function find($uri) {
+        if ($uri != '/' && $uri[0] == '/') {
+            $uri = substr($uri, 1);
+        }
+        $start_pos = 0;
+        $parent = &$this->routes;
+        $uri_len = strlen($uri);
+        $matches = [];
+
+        while ($start_pos < $uri_len) {
+            $slash_pos = strpos($uri, '/', $start_pos);
+            if ($slash_pos !== false) {
+                $part = substr($uri, $start_pos, $slash_pos-$start_pos+1);
+                $start_pos = $slash_pos+1;
+            } else {
+                $part = substr($uri, $start_pos);
+                $start_pos = $uri_len;
+            }
+
+            $found = false;
+            if (isset($parent['children'][$part])) {
+                $parent = &$parent['children'][$part];
+                $found = true;
+            } else if (!empty($parent['re_children'])) {
+                foreach ($parent['re_children'] as $re => &$child) {
+                    $exp = '#^'.$re.'$#';
+                    $re_result = preg_match($exp, $part, $match);
+                    if ($re_result === false) {
+                        logError(__METHOD__.": regex $exp failed");
+                        continue;
+                    }
+
+                    if ($re_result) {
+                        if (count($match) > 1) {
+                            $matches = array_merge($matches, array_slice($match, 1));
+                        }
+                        $parent = &$child;
+                        $found = true;
+                        break;
+                    }
+                }
+            }
+
+            if (!$found)
+                return false;
+        }
+
+        if (!isset($parent['value']))
+            return false;
+
+        $value = $parent['value'];
+        if (!empty($matches)) {
+            foreach ($matches as $i => $match) {
+                $needle = '$('.($i+1).')';
+                $pos = strpos($value, $needle);
+                if ($pos !== false) {
+                    $value = substr_replace($value, $match, $pos, strlen($needle));
+                }
+            }
+        }
+
+        return $value;
+    }
+
+    public function load($routes) {
+        $this->routes = $routes;
+    }
+
+    public function dump(): array {
+        return $this->routes;
+    }
+
+}
-- 
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