<?php
/*

Copyrights for code authored by Yahoo! Inc. is licensed under the following terms:
MIT License
Copyright (c) 2013-2016 Yahoo! Inc. All Rights Reserved.
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.

Origin: https://github.com/zordius/lightncandy
*/

/**
 * file to keep LightnCandy partial methods
 *
 * @package    LightnCandy
 * @author     Zordius <zordius@yahoo-inc.com>
 */

namespace LightnCandy;

use \LightnCandy\Compiler;
use \LightnCandy\SafeString;
use \LightnCandy\Context;

/**
 * LightnCandy Partial handler
 */
class Partial
{
    public static $TMP_JS_FUNCTION_STR = "!!\aFuNcTiOn\a!!";

    /**
     * Include all partials when using dynamic partials
     */
    public static function handleDynamic(&$context) {
        if ($context['usedFeature']['dynpartial'] == 0) {
            return;
        }

        foreach ($context['partials'] as $name => $code) {
            static::read($context, $name);
        }
    }

    /**
     * Read partial file content as string and store in context
     *
     * @param array<string,array|string|integer> $context Current context of compiler progress.
     * @param string $name partial name
     *
     * @return string|null $code compiled PHP code when success
     */
    public static function read(&$context, $name) {
        $context['usedFeature']['partial']++;

        if (isset($context['usedPartial'][$name])) {
            return;
        }

        $cnt = static::resolve($context, $name);

        if ($cnt !== null) {
            $context['usedPartial'][$name] = SafeString::escapeTemplate($cnt);
            return static::compileDynamic($context, $name);
        }

        if (!$context['flags']['skippartial']) {
            $context['error'][] = "Can not find partial for '$name', you should provide partials or partialresolver in options";
        }
    }

    /**
     * preprocess partial template before it be stored into context
     *
     * @param array<string,array|string|integer> $context Current context of compiler progress.
     * @param string $tmpl partial template
     * @param string $name partial name
     *
     * @return string|null $content processed partial template
     *
     * @expect 'hey' when input Array('prepartial' => false), 'hey', 'haha'
     * @expect 'haha-hoho' when input Array('prepartial' => function ($cx, $tmpl, $name) {return "$name-$tmpl";}), 'hoho', 'haha'
     */
    protected static function prePartial(&$context, $tmpl, &$name) {
        return $context['prepartial'] ? $context['prepartial']($context, $tmpl, $name) : $tmpl;
    }

    /**
     * resolve partial, return the partial content
     *
     * @param array<string,array|string|integer> $context Current context of compiler progress.
     * @param string $name partial name
     *
     * @return string|null $content partial content
     */
    public static function resolve(&$context, &$name) {
        if ($name === '@partial-block') {
            $name = "@partial-block{$context['usedFeature']['pblock']}";
        }
        if (isset($context['partials'][$name])) {
            return static::prePartial($context, $context['partials'][$name], $name);
        }

        return static::resolver($context, $name);
    }

    /**
     * use partialresolver to resolve partial, return the partial content
     *
     * @param array<string,array|string|integer> $context Current context of compiler progress.
     * @param string $name partial name
     *
     * @return string|null $content partial content
     */
    public static function resolver(&$context, &$name) {
        if ($context['partialresolver']) {
            $cnt = $context['partialresolver']($context, $name);
            return static::prePartial($context, $cnt, $name);
        }
    }

    /**
     * compile a partial to static embed PHP code
     *
     * @param array<string,array|string|integer> $context Current context of compiler progress.
     * @param string $name partial name
     *
     * @return string|null $code PHP code string
     */
    public static function compileStatic(&$context, $name) {
        // Check for recursive partial
        if (!$context['flags']['runpart']) {
            $context['partialStack'][] = $name;
            $diff = count($context['partialStack']) - count(array_unique($context['partialStack']));
            if ($diff) {
                $context['error'][] = 'I found recursive partial includes as the path: ' . implode(' -> ', $context['partialStack']) . '! You should fix your template or compile with LightnCandy::FLAG_RUNTIMEPARTIAL flag.';
            }
        }

        $code = Compiler::compileTemplate($context, preg_replace('/^/m', $context['tokens']['partialind'], $context['usedPartial'][$name]));

        if (!$context['flags']['runpart']) {
            array_pop($context['partialStack']);
        }

        return $code;
    }

    /**
     * compile partial as closure, stored in context
     *
     * @param array<string,array|string|integer> $context Current context of compiler progress.
     * @param string $name partial name
     *
     * @return string|null $code compiled PHP code when success
     */
    public static function compileDynamic(&$context, $name) {
        if (!$context['flags']['runpart']) {
            return;
        }

        $func = static::compile($context, $context['usedPartial'][$name]);

        if (!isset($context['partialCode'][$name])) {
            $context['partialCode'][$name] = "'$name' => $func";
        }

        return $func;
    }

    /**
     * compile a template into a closure function
     *
     * @param array<string,array|string|integer> $context Current context of compiler progress.
     * @param string $template template string
     *
     * @return string $code compiled PHP code
     */
    public static function compile(&$context, $template) {
        $tmpContext = $context;
        $tmpContext['inlinepartial'] = array();
        $tmpContext['partialblock'] = array();
        $code = Compiler::compileTemplate($tmpContext, str_replace('function', static::$TMP_JS_FUNCTION_STR, $template));
        Context::merge($context, $tmpContext);
        if (!$context['flags']['noind']) {
            $sp = ', $sp';
            $code = preg_replace('/^/m', "'{$context['ops']['seperator']}\$sp{$context['ops']['seperator']}'", $code);
            // callbacks inside partial should be aware of $sp
            $code = preg_replace('/\bfunction\s*\((.*?)\)\s*{/', 'function(\\1)use($sp){', $code);
        } else {
            $sp = '';
        }
        $code = str_replace(static::$TMP_JS_FUNCTION_STR, 'function', $code);
        return "function (\$cx, \$in{$sp}) {{$context['ops']['op_start']}'$code'{$context['ops']['op_end']}}";
    }
}

