      1: <?php
      2: /*
      3:
      4: MIT License
      5: Copyright 2013-2018 Zordius Chen. All Rights Reserved.
      6: 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:
      7: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
      8: 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.
      9:
     10: Origin: https://github.com/zordius/lightncandy
     11: */
     12:
     13: /**
     14:  * file to support LightnCandy compiled PHP runtime
     15:  *
     16:  * @package    LightnCandy
     17:  * @author     Zordius <zordius@gmail.com>
     18:  */
     19:
     20: namespace LightnCandy;
     21:
     22: use \LightnCandy\Encoder;
     23:
     24: /**
     25:  * LightnCandy class for Object property access on a string.
     26:  */
     27: class StringObject
     28: {
     29:     protected $string;
     30:
     31:     public function __construct($string)
     32:     {
     33:         $this->string = $string;
     34:     }
     35:
     36:     public function __toString()
     37:     {
     38:         return strval($this->string);
     39:     }
     40: }
     41:
     42: /**
     43:  * LightnCandy class for compiled PHP runtime.
     44:  */
     45: class Runtime extends Encoder
     46: {
     47:     const DEBUG_ERROR_LOG = 1;
     48:     const DEBUG_ERROR_EXCEPTION = 2;
     49:     const DEBUG_TAGS = 4;
     50:     const DEBUG_TAGS_ANSI = 12;
     51:     const DEBUG_TAGS_HTML = 20;
     52:
     53:     /**
     54:      * Output debug info.
     55:      *
     56:      * @param string $v expression
     57:      * @param string $f runtime function name
     58:      * @param array<string,array|string|integer> $cx render time context for lightncandy
     59:      *
     60:      * @expect '{{123}}' when input '123', 'miss', array('flags' => array('debug' => Runtime::DEBUG_TAGS), 'runtime' => 'LightnCandy\\Runtime'), ''
     61:      * @expect '<!--MISSED((-->{{#123}}<!--))--><!--SKIPPED--><!--MISSED((-->{{/123}}<!--))-->' when input '123', 'wi', array('flags' => array('debug' => Runtime::DEBUG_TAGS_HTML), 'runtime' => 'LightnCandy\\Runtime'), false, null, false, function () {return 'A';}
     62:      */
     63:     public static function debug($v, $f, $cx)
     64:     {
     65:         // Build array of reference for call_user_func_array
     66:         $P = func_get_args();
     67:         $params = array();
     68:         for ($i=2;$i<count($P);$i++) {
     69:             $params[] = &$P[$i];
     70:         }
     71:         $r = call_user_func_array((isset($cx['funcs'][$f]) ? $cx['funcs'][$f] : "{$cx['runtime']}::$f"), $params);
     72:
     73:         if ($cx['flags']['debug'] & static::DEBUG_TAGS) {
     74:             $ansi = $cx['flags']['debug'] & (static::DEBUG_TAGS_ANSI - static::DEBUG_TAGS);
     75:             $html = $cx['flags']['debug'] & (static::DEBUG_TAGS_HTML - static::DEBUG_TAGS);
     76:             $cs = ($html ? (($r !== '') ? '<!!--OK((-->' : '<!--MISSED((-->') : '')
     77:                   . ($ansi ? (($r !== '') ? "\033[0;32m" : "\033[0;31m") : '');
     78:             $ce = ($html ? '<!--))-->' : '')
     79:                   . ($ansi ? "\033[0m" : '');
     80:             switch ($f) {
     81:                 case 'sec':
     82:                 case 'wi':
     83:                     if ($r == '') {
     84:                         if ($ansi) {
     85:                             $r = "\033[0;33mSKIPPED\033[0m";
     86:                         }
     87:                         if ($html) {
     88:                             $r = '<!--SKIPPED-->';
     89:                         }
     90:                     }
     91:                     return "$cs{{#{$v}}}$ce{$r}$cs{{/{$v}}}$ce";
     92:                 default:
     93:                     return "$cs{{{$v}}}$ce";
     94:             }
     95:         } else {
     96:             return $r;
     97:         }
     98:     }
     99:
    100:     /**
    101:      * Handle error by error_log or throw exception.
    102:      *
    103:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    104:      * @param string $err error message
    105:      *
    106:      * @throws \Exception
    107:      */
    108:     public static function err($cx, $err)
    109:     {
    110:         if ($cx['flags']['debug'] & static::DEBUG_ERROR_LOG) {
    111:             error_log($err);
    112:             return;
    113:         }
    114:         if ($cx['flags']['debug'] & static::DEBUG_ERROR_EXCEPTION) {
    115:             throw new \Exception($err);
    116:         }
    117:     }
    118:
    119:     /**
    120:      * Handle missing data error.
    121:      *
    122:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    123:      * @param string $v expression
    124:      */
    125:     public static function miss($cx, $v)
    126:     {
    127:         static::err($cx, "Runtime: $v does not exist");
    128:     }
    129:
    130:     /**
    131:      * For {{log}} .
    132:      *
    133:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    134:      * @param string $v expression
    135:      */
    136:     public static function lo($cx, $v)
    137:     {
    138:         error_log(var_export($v[0], true));
    139:         return '';
    140:     }
    141:
    142:     /**
    143:      * Resursive lookup variable and helpers. This is slow and will only be used for instance property or method detection or lambdas.
    144:      *
    145:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    146:      * @param array|string|boolean|integer|double|null $in current context
    147:      * @param array<array|string|integer> $base current variable context
    148:      * @param array<string|integer> $path array of names for path
    149:      * @param array|null $args extra arguments for lambda
    150:      *
    151:      * @return null|string Return the value or null when not found
    152:      *
    153:      * @expect null when input array('scopes' => array(), 'flags' => array('prop' => 0, 'method' => 0, 'mustlok' => 0)), null, 0, array('a', 'b')
    154:      * @expect 3 when input array('scopes' => array(), 'flags' => array('prop' => 0, 'method' => 0), 'mustlok' => 0), null, array('a' => array('b' => 3)), array('a', 'b')
    155:      * @expect null when input array('scopes' => array(), 'flags' => array('prop' => 0, 'method' => 0, 'mustlok' => 0)), null, (Object) array('a' => array('b' => 3)), array('a', 'b')
    156:      * @expect 3 when input array('scopes' => array(), 'flags' => array('prop' => 1, 'method' => 0, 'mustlok' => 0)), null, (Object) array('a' => array('b' => 3)), array('a', 'b')
    157:      */
    158:     public static function v($cx, $in, $base, $path, $args = null)
    159:     {
    160:         $count = count($cx['scopes']);
    161:         $plen = count($path);
    162:         while ($base) {
    163:             $v = $base;
    164:             foreach ($path as $i => $name) {
    165:                 if (is_array($v)) {
    166:                     if (isset($v[$name])) {
    167:                         $v = $v[$name];
    168:                         continue;
    169:                     }
    170:                     if (($i === $plen - 1) && ($name === 'length')) {
    171:                         return count($v);
    172:                     }
    173:                 }
    174:                 if (is_object($v)) {
    175:                     if ($cx['flags']['prop'] && !($v instanceof \Closure) && isset($v->$name)) {
    176:                         $v = $v->$name;
    177:                         continue;
    178:                     }
    179:                     if ($cx['flags']['method'] && is_callable(array($v, $name))) {
    180:                         $v = $v->$name();
    181:                         continue;
    182:                     }
    183:                 }
    184:                 if ($cx['flags']['mustlok']) {
    185:                     unset($v);
    186:                     break;
    187:                 }
    188:                 return null;
    189:             }
    190:             if (isset($v)) {
    191:                 if ($v instanceof \Closure) {
    192:                     if ($cx['flags']['mustlam'] || $cx['flags']['lambda']) {
    193:                         if (!$cx['flags']['knohlp'] && ($args || ($args === 0))) {
    194:                             $A = $args ? $args[0] : array();
    195:                             $A[] = array('hash' => $args[1], '_this' => $in);
    196:                         } else {
    197:                             $A = array($in);
    198:                         }
    199:                         $v = call_user_func_array($v, $A);
    200:                     }
    201:                 }
    202:                 return $v;
    203:             }
    204:             $count--;
    205:             switch ($count) {
    206:                 case -1:
    207:                     $base = $cx['sp_vars']['root'];
    208:                     break;
    209:                 case -2:
    210:                     return null;
    211:                 default:
    212:                     $base = $cx['scopes'][$count];
    213:             }
    214:         }
    215:         if ($args) {
    216:             static::err($cx, 'Can not find helper or lambda: "' . implode('.', $path) . '" !');
    217:         }
    218:     }
    219:
    220:     /**
    221:      * For {{#if}} .
    222:      *
    223:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    224:      * @param array<array|string|integer>|string|integer|null $v value to be tested
    225:      * @param boolean $zero include zero as true
    226:      *
    227:      * @return boolean Return true when the value is not null nor false.
    228:      *
    229:      * @expect false when input array(), null, false
    230:      * @expect false when input array(), 0, false
    231:      * @expect true when input array(), 0, true
    232:      * @expect false when input array(), false, false
    233:      * @expect true when input array(), true, false
    234:      * @expect true when input array(), 1, false
    235:      * @expect false when input array(), '', false
    236:      * @expect false when input array(), array(), false
    237:      * @expect true when input array(), array(''), false
    238:      * @expect true when input array(), array(0), false
    239:      */
    240:     public static function ifvar($cx, $v, $zero)
    241:     {
    242:         return ($v !== null) && ($v !== false) && ($zero || ($v !== 0) && ($v !== 0.0)) && ($v !== '') && (is_array($v) ? (count($v) > 0) : true);
    243:     }
    244:
    245:     /**
    246:      * For {{^var}} .
    247:      *
    248:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    249:      * @param array<array|string|integer>|string|integer|null $v value to be tested
    250:      *
    251:      * @return boolean Return true when the value is not null nor false.
    252:      *
    253:      * @expect true when input array(), null
    254:      * @expect false when input array(), 0
    255:      * @expect true when input array(), false
    256:      * @expect false when input array(), 'false'
    257:      * @expect true when input array(), array()
    258:      * @expect false when input array(), array('1')
    259:      */
    260:     public static function isec($cx, $v)
    261:     {
    262:         return ($v === null) || ($v === false) || (is_array($v) && (count($v) === 0));
    263:     }
    264:
    265:     /**
    266:      * For {{var}} .
    267:      *
    268:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    269:      * @param array<array|string|integer>|string|integer|null $var value to be htmlencoded
    270:      *
    271:      * @return string The htmlencoded value of the specified variable
    272:      *
    273:      * @expect 'a' when input array('flags' => array('mustlam' => 0, 'lambda' => 0)), 'a'
    274:      * @expect 'a&amp;b' when input array('flags' => array('mustlam' => 0, 'lambda' => 0)), 'a&b'
    275:      * @expect 'a&#039;b' when input array('flags' => array('mustlam' => 0, 'lambda' => 0)), 'a\'b'
    276:      * @expect 'a&b' when input null, new \LightnCandy\SafeString('a&b')
    277:      */
    278:     public static function enc($cx, $var)
    279:     {
    280:         if ($var instanceof \LightnCandy\SafeString) {
    281:             return (string)$var;
    282:         }
    283:
    284:         return htmlspecialchars(static::raw($cx, $var), ENT_QUOTES, 'UTF-8');
    285:     }
    286:
    287:     /**
    288:      * For {{var}} , do html encode just like handlebars.js .
    289:      *
    290:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    291:      * @param array<array|string|integer>|string|integer|null $var value to be htmlencoded
    292:      *
    293:      * @return string The htmlencoded value of the specified variable
    294:      *
    295:      * @expect 'a' when input array('flags' => array('mustlam' => 0, 'lambda' => 0)), 'a'
    296:      * @expect 'a&amp;b' when input array('flags' => array('mustlam' => 0, 'lambda' => 0)), 'a&b'
    297:      * @expect 'a&#x27;b' when input array('flags' => array('mustlam' => 0, 'lambda' => 0)), 'a\'b'
    298:      * @expect '&#x60;a&#x27;b' when input array('flags' => array('mustlam' => 0, 'lambda' => 0)), '`a\'b'
    299:      */
    300:     public static function encq($cx, $var)
    301:     {
    302:         if ($var instanceof \LightnCandy\SafeString) {
    303:             return (string)$var;
    304:         }
    305:
    306:         return str_replace(array('=', '`', '&#039;'), array('&#x3D;', '&#x60;', '&#x27;'), htmlspecialchars(static::raw($cx, $var), ENT_QUOTES, 'UTF-8'));
    307:     }
    308:
    309:     /**
    310:      * For {{#var}} or {{#each}} .
    311:      *
    312:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    313:      * @param array<array|string|integer>|string|integer|null $v value for the section
    314:      * @param array<string>|null $bp block parameters
    315:      * @param array<array|string|integer>|string|integer|null $in input data with current scope
    316:      * @param boolean $each true when rendering #each
    317:      * @param Closure $cb callback function to render child context
    318:      * @param Closure|null $else callback function to render child context when {{else}}
    319:      *
    320:      * @return string The rendered string of the section
    321:      *
    322:      * @expect '' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), false, null, false, false, function () {return 'A';}
    323:      * @expect '' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), null, null, null, false, function () {return 'A';}
    324:      * @expect 'A' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), true, null, true, false, function () {return 'A';}
    325:      * @expect 'A' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), 0, null, 0, false, function () {return 'A';}
    326:      * @expect '-a=' when input array('scopes' => array(), 'flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), array('a'), null, array('a'), false, function ($c, $i) {return "-$i=";}
    327:      * @expect '-a=-b=' when input array('scopes' => array(), 'flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), array('a','b'), null, array('a','b'), false, function ($c, $i) {return "-$i=";}
    328:      * @expect '' when input array('scopes' => array(), 'flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), 'abc', null, 'abc', true, function ($c, $i) {return "-$i=";}
    329:      * @expect '-b=' when input array('scopes' => array(), 'flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), array('a' => 'b'), null, array('a' => 'b'), true, function ($c, $i) {return "-$i=";}
    330:      * @expect 'b' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), 'b', null, 'b', false, function ($c, $i) {return print_r($i, true);}
    331:      * @expect '1' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), 1, null, 1, false, function ($c, $i) {return print_r($i, true);}
    332:      * @expect '0' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), 0, null, 0, false, function ($c, $i) {return print_r($i, true);}
    333:      * @expect '{"b":"c"}' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), array('b' => 'c'), null, array('b' => 'c'), false, function ($c, $i) {return json_encode($i);}
    334:      * @expect 'inv' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), array(), null, 0, true, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    335:      * @expect 'inv' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), array(), null, 0, false, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    336:      * @expect 'inv' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), false, null, 0, true, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    337:      * @expect 'inv' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), false, null, 0, false, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    338:      * @expect 'inv' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), '', null, 0, true, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    339:      * @expect 'cb' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), '', null, 0, false, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    340:      * @expect 'inv' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), 0, null, 0, true, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    341:      * @expect 'cb' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), 0, null, 0, false, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    342:      * @expect 'inv' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'lambda' => 0)), new stdClass, null, 0, true, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    343:      * @expect 'cb' when input array('flags' => array('spvar' => 0, 'mustlam' => 0, 'mustsec' => 0, 'lambda' => 0)), new stdClass, null, 0, false, function ($c, $i) {return 'cb';}, function ($c, $i) {return 'inv';}
    344:      * @expect '268' when input array('scopes' => array(), 'flags' => array('spvar' => 1, 'mustlam' => 0, 'lambda' => 0), 'sp_vars'=>array('root' => 0)), array(1,3,4), null, 0, false, function ($c, $i) {return $i * 2;}
    345:      * @expect '038' when input array('scopes' => array(), 'flags' => array('spvar' => 1, 'mustlam' => 0, 'lambda' => 0), 'sp_vars'=>array('root' => 0)), array(1,3,'a'=>4), null, 0, true, function ($c, $i) {return $i * $c['sp_vars']['index'];}
    346:      */
    347:     public static function sec($cx, $v, $bp, $in, $each, $cb, $else = null)
    348:     {
    349:         $push = ($in !== $v) || $each;
    350:
    351:         $isAry = is_array($v) || ($v instanceof \ArrayObject);
    352:         $isTrav = $v instanceof \Traversable;
    353:         $loop = $each;
    354:         $keys = null;
    355:         $last = null;
    356:         $isObj = false;
    357:
    358:         if ($isAry && $else !== null && count($v) === 0) {
    359:             $ret = $else($cx, $in);
    360:             return $ret;
    361:         }
    362:
    363:         // #var, detect input type is object or not
    364:         if (!$loop && $isAry) {
    365:             $keys = array_keys($v);
    366:             $loop = (count(array_diff_key($v, array_keys($keys))) == 0);
    367:             $isObj = !$loop;
    368:         }
    369:
    370:         if (($loop && $isAry) || $isTrav) {
    371:             if ($each && !$isTrav) {
    372:                 // Detect input type is object or not when never done once
    373:                 if ($keys == null) {
    374:                     $keys = array_keys($v);
    375:                     $isObj = (count(array_diff_key($v, array_keys($keys))) > 0);
    376:                 }
    377:             }
    378:             $ret = array();
    379:             if ($push) {
    380:                 $cx['scopes'][] = $in;
    381:             }
    382:             $i = 0;
    383:             if ($cx['flags']['spvar']) {
    384:                 $old_spvar = $cx['sp_vars'];
    385:                 $cx['sp_vars'] = array_merge(array('root' => $old_spvar['root']), $old_spvar, array('_parent' => $old_spvar));
    386:                 if (!$isTrav) {
    387:                     $last = count($keys) - 1;
    388:                 }
    389:             }
    390:
    391:             $isSparceArray = $isObj && (count(array_filter(array_keys($v), 'is_string')) == 0);
    392:             foreach ($v as $index => $raw) {
    393:                 if ($cx['flags']['spvar']) {
    394:                     $cx['sp_vars']['first'] = ($i === 0);
    395:                     $cx['sp_vars']['last'] = ($i == $last);
    396:                     $cx['sp_vars']['key'] = $index;
    397:                     $cx['sp_vars']['index'] = $isSparceArray ? $index : $i;
    398:                     $i++;
    399:                 }
    400:                 if (isset($bp[0])) {
    401:                     $raw = static::m($cx, $raw, array($bp[0] => $raw));
    402:                 }
    403:                 if (isset($bp[1])) {
    404:                     $raw = static::m($cx, $raw, array($bp[1] => $index));
    405:                 }
    406:                 $ret[] = $cb($cx, $raw);
    407:             }
    408:             if ($cx['flags']['spvar']) {
    409:                 if ($isObj) {
    410:                     unset($cx['sp_vars']['key']);
    411:                 } else {
    412:                     unset($cx['sp_vars']['last']);
    413:                 }
    414:                 unset($cx['sp_vars']['index']);
    415:                 unset($cx['sp_vars']['first']);
    416:                 $cx['sp_vars'] = $old_spvar;
    417:             }
    418:             if ($push) {
    419:                 array_pop($cx['scopes']);
    420:             }
    421:             return join('', $ret);
    422:         }
    423:         if ($each) {
    424:             if ($else !== null) {
    425:                 $ret = $else($cx, $v);
    426:                 return $ret;
    427:             }
    428:             return '';
    429:         }
    430:         if ($isAry) {
    431:             if ($push) {
    432:                 $cx['scopes'][] = $in;
    433:             }
    434:             $ret = $cb($cx, $v);
    435:             if ($push) {
    436:                 array_pop($cx['scopes']);
    437:             }
    438:             return $ret;
    439:         }
    440:
    441:         if ($cx['flags']['mustsec']) {
    442:             return $v ? $cb($cx, $in) : '';
    443:         }
    444:
    445:         if ($v === true) {
    446:             return $cb($cx, $in);
    447:         }
    448:
    449:         if (($v !== null) && ($v !== false)) {
    450:             return $cb($cx, $v);
    451:         }
    452:
    453:         if ($else !== null) {
    454:             $ret = $else($cx, $in);
    455:             return $ret;
    456:         }
    457:
    458:         return '';
    459:     }
    460:
    461:     /**
    462:      * For {{#with}} .
    463:      *
    464:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    465:      * @param array<array|string|integer>|string|integer|null $v value to be the new context
    466:      * @param array<array|string|integer>|string|integer|null $in input data with current scope
    467:      * @param array<string>|null $bp block parameters
    468:      * @param Closure $cb callback function to render child context
    469:      * @param Closure|null $else callback function to render child context when {{else}}
    470:      *
    471:      * @return string The rendered string of the token
    472:      *
    473:      * @expect '' when input array(), false, null, false, function () {return 'A';}
    474:      * @expect '' when input array(), null, null, null, function () {return 'A';}
    475:      * @expect '{"a":"b"}' when input array(), array('a'=>'b'), null, array('a'=>'c'), function ($c, $i) {return json_encode($i);}
    476:      * @expect '-b=' when input array(), 'b', null, array('a'=>'b'), function ($c, $i) {return "-$i=";}
    477:      */
    478:     public static function wi($cx, $v, $bp, $in, $cb, $else = null)
    479:     {
    480:         if (isset($bp[0])) {
    481:             $v = static::m($cx, $v, array($bp[0] => $v));
    482:         }
    483:         if (($v === false) || ($v === null) || (is_array($v) && (count($v) === 0))) {
    484:             return $else ? $else($cx, $in) : '';
    485:         }
    486:         if ($v === $in) {
    487:             $ret = $cb($cx, $v);
    488:         } else {
    489:             $cx['scopes'][] = $in;
    490:             $ret = $cb($cx, $v);
    491:             array_pop($cx['scopes']);
    492:         }
    493:         return $ret;
    494:     }
    495:
    496:     /**
    497:      * Get merged context.
    498:      *
    499:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    500:      * @param array<array|string|integer>|string|integer|null $a the context to be merged
    501:      * @param array<array|string|integer>|string|integer|null $b the new context to overwrite
    502:      *
    503:      * @return array<array|string|integer>|string|integer the merged context object
    504:      *
    505:      */
    506:     public static function m($cx, $a, $b)
    507:     {
    508:         if (is_array($b)) {
    509:             if ($a === null) {
    510:                 return $b;
    511:             } elseif (is_array($a)) {
    512:                 return array_merge($a, $b);
    513:             } elseif ($cx['flags']['method'] || $cx['flags']['prop']) {
    514:                 if (!is_object($a)) {
    515:                     $a = new StringObject($a);
    516:                 }
    517:                 foreach ($b as $i => $v) {
    518:                     $a->$i = $v;
    519:                 }
    520:             }
    521:         }
    522:         return $a;
    523:     }
    524:
    525:     /**
    526:      * For {{> partial}} .
    527:      *
    528:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    529:      * @param string $p partial name
    530:      * @param array<array|string|integer>|string|integer|null $v value to be the new context
    531:      *
    532:      * @return string The rendered string of the partial
    533:      *
    534:      */
    535:     public static function p($cx, $p, $v, $pid, $sp = '')
    536:     {
    537:         $pp = ($p === '@partial-block') ? "$p" . ($pid > 0 ? $pid : $cx['partialid']) : $p;
    538:
    539:         if (!isset($cx['partials'][$pp])) {
    540:             static::err($cx, "Can not find partial named as '$p' !!");
    541:             return '';
    542:         }
    543:
    544:         $cx['partialid'] = ($p === '@partial-block') ? (($pid > 0) ? $pid : (($cx['partialid'] > 0) ? $cx['partialid'] - 1 : 0)) : $pid;
    545:
    546:         return call_user_func($cx['partials'][$pp], $cx, static::m($cx, $v[0][0], $v[1]), $sp);
    547:     }
    548:
    549:     /**
    550:      * For {{#* inlinepartial}} .
    551:      *
    552:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    553:      * @param string $p partial name
    554:      * @param Closure $code the compiled partial code
    555:      *
    556:      */
    557:     public static function in(&$cx, $p, $code)
    558:     {
    559:         $cx['partials'][$p] = $code;
    560:     }
    561:
    562:     /* For single custom helpers.
    563:      *
    564:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    565:      * @param string $ch the name of custom helper to be executed
    566:      * @param array<array|string|integer>|string|integer|null $vars variables for the helper
    567:      * @param string $op the name of variable resolver. should be one of: 'raw', 'enc', or 'encq'.
    568:      * @param array<string,array|string|integer> $_this current rendering context for the helper
    569:      *
    570:      * @return string The rendered string of the token
    571:      */
    572:     public static function hbch($cx, $ch, $vars, $op, &$_this)
    573:     {
    574:         if (isset($cx['blparam'][0][$ch])) {
    575:             return $cx['blparam'][0][$ch];
    576:         }
    577:
    578:         $options = array(
    579:             'name' => $ch,
    580:             'hash' => $vars[1],
    581:             'contexts' => count($cx['scopes']) ? $cx['scopes'] : array(null),
    582:             'fn.blockParams' => 0,
    583:             '_this' => &$_this
    584:         );
    585:
    586:         if ($cx['flags']['spvar']) {
    587:             $options['data'] = $cx['sp_vars'];
    588:         }
    589:
    590:         return static::exch($cx, $ch, $vars, $options);
    591:     }
    592:
    593:     /**
    594:      * For block custom helpers.
    595:      *
    596:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    597:      * @param string $ch the name of custom helper to be executed
    598:      * @param array<array|string|integer>|string|integer|null $vars variables for the helper
    599:      * @param array<string,array|string|integer> $_this current rendering context for the helper
    600:      * @param boolean $inverted the logic will be inverted
    601:      * @param Closure|null $cb callback function to render child context
    602:      * @param Closure|null $else callback function to render child context when {{else}}
    603:      *
    604:      * @return string The rendered string of the token
    605:      */
    606:     public static function hbbch($cx, $ch, $vars, &$_this, $inverted, $cb, $else = null)
    607:     {
    608:         $options = array(
    609:             'name' => $ch,
    610:             'hash' => $vars[1],
    611:             'contexts' => count($cx['scopes']) ? $cx['scopes'] : array(null),
    612:             'fn.blockParams' => 0,
    613:             '_this' => &$_this,
    614:         );
    615:
    616:         if ($cx['flags']['spvar']) {
    617:             $options['data'] = $cx['sp_vars'];
    618:         }
    619:
    620:         if (isset($vars[2])) {
    621:             $options['fn.blockParams'] = count($vars[2]);
    622:         }
    623:
    624:         // $invert the logic
    625:         if ($inverted) {
    626:             $tmp = $else;
    627:             $else = $cb;
    628:             $cb = $tmp;
    629:         }
    630:
    631:         $options['fn'] = function ($context = '_NO_INPUT_HERE_', $data = null) use ($cx, &$_this, $cb, $options, $vars) {
    632:             if ($cx['flags']['echo']) {
    633:                 ob_start();
    634:             }
    635:             if (isset($data['data'])) {
    636:                 $old_spvar = $cx['sp_vars'];
    637:                 $cx['sp_vars'] = array_merge(array('root' => $old_spvar['root']), $data['data'], array('_parent' => $old_spvar));
    638:             }
    639:             $ex = false;
    640:             if (isset($data['blockParams']) && isset($vars[2])) {
    641:                 $ex = array_combine($vars[2], array_slice($data['blockParams'], 0, count($vars[2])));
    642:                 array_unshift($cx['blparam'], $ex);
    643:             } elseif (isset($cx['blparam'][0])) {
    644:                 $ex = $cx['blparam'][0];
    645:             }
    646:             if (($context === '_NO_INPUT_HERE_') || ($context === $_this)) {
    647:                 $ret = $cb($cx, is_array($ex) ? static::m($cx, $_this, $ex) : $_this);
    648:             } else {
    649:                 $cx['scopes'][] = $_this;
    650:                 $ret = $cb($cx, is_array($ex) ? static::m($cx, $context, $ex) : $context);
    651:                 array_pop($cx['scopes']);
    652:             }
    653:             if (isset($data['data'])) {
    654:                 $cx['sp_vars'] = $old_spvar;
    655:             }
    656:             return $cx['flags']['echo'] ? ob_get_clean() : $ret;
    657:         };
    658:
    659:         if ($else) {
    660:             $options['inverse'] = function ($context = '_NO_INPUT_HERE_') use ($cx, $_this, $else) {
    661:                 if ($cx['flags']['echo']) {
    662:                     ob_start();
    663:                 }
    664:                 if ($context === '_NO_INPUT_HERE_') {
    665:                     $ret = $else($cx, $_this);
    666:                 } else {
    667:                     $cx['scopes'][] = $_this;
    668:                     $ret = $else($cx, $context);
    669:                     array_pop($cx['scopes']);
    670:                 }
    671:                 return $cx['flags']['echo'] ? ob_get_clean() : $ret;
    672:             };
    673:         } else {
    674:             $options['inverse'] = function () {
    675:                 return '';
    676:             };
    677:         }
    678:
    679:         return static::exch($cx, $ch, $vars, $options);
    680:     }
    681:
    682:     /**
    683:      * Execute custom helper with prepared options
    684:      *
    685:      * @param array<string,array|string|integer> $cx render time context for lightncandy
    686:      * @param string $ch the name of custom helper to be executed
    687:      * @param array<array|string|integer>|string|integer|null $vars variables for the helper
    688:      * @param array<string,array|string|integer> $options the options object
    689:      *
    690:      * @return string The rendered string of the token
    691:      */
    692:     public static function exch($cx, $ch, $vars, &$options)
    693:     {
    694:         $args = $vars[0];
    695:         $args[] = $options;
    696:         $e = null;
    697:         $r = true;
    698:
    699:         try {
    700:             $r = call_user_func_array($cx['helpers'][$ch], $args);
    701:         } catch (\Exception $E) {
    702:             $e = "Runtime: call custom helper '$ch' error: " . $E->getMessage();
    703:         }
    704:
    705:         if ($e !== null) {
    706:             static::err($cx, $e);
    707:         }
    708:
    709:         return $r;
    710:     }
    711: }
    712: