diff options
Diffstat (limited to 'engine/router.php')
| -rw-r--r-- | engine/router.php | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/engine/router.php b/engine/router.php new file mode 100644 index 0000000..401e177 --- /dev/null +++ b/engine/router.php @@ -0,0 +1,185 @@ +<?php + +const ROUTER_VERSION = 1; +const ROUTER_MC_KEY = 'ch1p/routes'; + +$RouterInput = []; +$Routes = [ + 'children' => [], + 're_children' => [] +]; + +function router_init(): void { + global $Routes; + $mc = MC(); + + $from_cache = !is_dev(); + $write_cache = !is_dev(); + + if ($from_cache) { + $cache = $mc->get(ROUTER_MC_KEY); + + if ($cache === false || !isset($cache['version']) || $cache['version'] < ROUTER_VERSION) { + $from_cache = false; + } else { + $Routes = $cache['routes']; + } + } + + if (!$from_cache) { + $routes_table = require_once APP_ROOT.'/routes.php'; + + foreach ($routes_table as $controller => $routes) { + foreach ($routes as $route => $resolve) + router_add($route, $controller.' '.$resolve); + } + + if ($write_cache) + $mc->set(ROUTER_MC_KEY, ['version' => ROUTER_VERSION, 'routes' => $Routes]); + } +} + +function router_add(string $template, string $value): void { + global $Routes; + if ($template == '') + return; + + // 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; + $parent = &$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; + } + + $parent = &_router_add($parent, $part, + $start_pos < $template_len ? null : $value); + } + } +} + +function &_router_add(&$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][$part]; +} + +function router_find($uri) { + global $Routes; + if ($uri != '/' && $uri[0] == '/') + $uri = substr($uri, 1); + + $start_pos = 0; + $parent = &$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 null; + } + + if (!isset($parent['value'])) + return null; + + $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; +} |