| 1 |
<?php |
| 2 |
|
| 3 |
namespace JFB_Modules\Gateways; |
| 4 |
|
| 5 |
use Jet_Form_Builder\Exceptions\Gateway_Exception; |
| 6 |
|
| 7 |
// If this file is called directly, abort. |
| 8 |
if ( ! defined( 'WPINC' ) ) { |
| 9 |
die; |
| 10 |
} |
| 11 |
|
| 12 |
class Trusted_Price_Resolver_Expression_Parser { |
| 13 |
|
| 14 |
/** |
| 15 |
* @var string |
| 16 |
*/ |
| 17 |
private $expression; |
| 18 |
|
| 19 |
/** |
| 20 |
* @var int |
| 21 |
*/ |
| 22 |
private $length; |
| 23 |
|
| 24 |
/** |
| 25 |
* @var int |
| 26 |
*/ |
| 27 |
private $position = 0; |
| 28 |
|
| 29 |
public function __construct( string $expression ) { |
| 30 |
$this->expression = preg_replace( '/\s+/', '', $expression ); |
| 31 |
$this->length = strlen( $this->expression ); |
| 32 |
} |
| 33 |
|
| 34 |
/** |
| 35 |
* @throws Gateway_Exception |
| 36 |
*/ |
| 37 |
public function parse(): float { |
| 38 |
$result = $this->evaluate_node( $this->parse_tree() ); |
| 39 |
|
| 40 |
if ( ! is_finite( $result ) ) { |
| 41 |
throw new Gateway_Exception( 'Calculated price expression produced a non-finite value.' ); |
| 42 |
} |
| 43 |
|
| 44 |
return $result; |
| 45 |
} |
| 46 |
|
| 47 |
/** |
| 48 |
* Validate the expression grammar without evaluating its runtime result. |
| 49 |
* |
| 50 |
* @throws Gateway_Exception |
| 51 |
*/ |
| 52 |
public function validate(): void { |
| 53 |
$this->validate_node( $this->parse_tree() ); |
| 54 |
} |
| 55 |
|
| 56 |
/** |
| 57 |
* @throws Gateway_Exception |
| 58 |
*/ |
| 59 |
private function parse_tree(): array { |
| 60 |
if ( '' === $this->expression ) { |
| 61 |
throw new Gateway_Exception( 'Calculated price expression is empty.' ); |
| 62 |
} |
| 63 |
|
| 64 |
$this->position = 0; |
| 65 |
|
| 66 |
$tree = $this->parse_conditional(); |
| 67 |
|
| 68 |
if ( $this->position < $this->length ) { |
| 69 |
throw new Gateway_Exception( 'Calculated price expression contains invalid syntax.' ); |
| 70 |
} |
| 71 |
|
| 72 |
return $tree; |
| 73 |
} |
| 74 |
|
| 75 |
/** |
| 76 |
* @throws Gateway_Exception |
| 77 |
*/ |
| 78 |
private function parse_conditional(): array { |
| 79 |
$condition = $this->parse_logical_or(); |
| 80 |
|
| 81 |
if ( ! $this->match( '?' ) ) { |
| 82 |
return $condition; |
| 83 |
} |
| 84 |
|
| 85 |
$consequent = $this->parse_conditional(); |
| 86 |
|
| 87 |
if ( ! $this->match( ':' ) ) { |
| 88 |
throw new Gateway_Exception( 'Calculated price expression contains an invalid conditional.' ); |
| 89 |
} |
| 90 |
|
| 91 |
return array( 'conditional', $condition, $consequent, $this->parse_conditional() ); |
| 92 |
} |
| 93 |
|
| 94 |
/** |
| 95 |
* @throws Gateway_Exception |
| 96 |
*/ |
| 97 |
private function parse_logical_or(): array { |
| 98 |
$node = $this->parse_logical_and(); |
| 99 |
|
| 100 |
while ( $this->match( '||' ) ) { |
| 101 |
$node = array( 'binary', '||', $node, $this->parse_logical_and() ); |
| 102 |
} |
| 103 |
|
| 104 |
return $node; |
| 105 |
} |
| 106 |
|
| 107 |
/** |
| 108 |
* @throws Gateway_Exception |
| 109 |
*/ |
| 110 |
private function parse_logical_and(): array { |
| 111 |
$node = $this->parse_bitwise_xor(); |
| 112 |
|
| 113 |
while ( $this->match( '&&' ) ) { |
| 114 |
$node = array( 'binary', '&&', $node, $this->parse_bitwise_xor() ); |
| 115 |
} |
| 116 |
|
| 117 |
return $node; |
| 118 |
} |
| 119 |
|
| 120 |
/** |
| 121 |
* Match JavaScript operator precedence: equality binds before bitwise XOR, |
| 122 |
* while logical AND binds after it. |
| 123 |
* |
| 124 |
* @throws Gateway_Exception |
| 125 |
*/ |
| 126 |
private function parse_bitwise_xor(): array { |
| 127 |
$node = $this->parse_equality(); |
| 128 |
|
| 129 |
while ( $this->match( '^' ) ) { |
| 130 |
$node = array( 'binary', '^', $node, $this->parse_equality() ); |
| 131 |
} |
| 132 |
|
| 133 |
return $node; |
| 134 |
} |
| 135 |
|
| 136 |
/** |
| 137 |
* @throws Gateway_Exception |
| 138 |
*/ |
| 139 |
private function parse_equality(): array { |
| 140 |
$node = $this->parse_comparison(); |
| 141 |
|
| 142 |
while ( true ) { |
| 143 |
$operator = $this->match_any( array( '===', '!==', '==', '!=' ) ); |
| 144 |
|
| 145 |
if ( false === $operator ) { |
| 146 |
return $node; |
| 147 |
} |
| 148 |
|
| 149 |
$node = array( 'binary', $operator, $node, $this->parse_comparison() ); |
| 150 |
} |
| 151 |
} |
| 152 |
|
| 153 |
/** |
| 154 |
* @throws Gateway_Exception |
| 155 |
*/ |
| 156 |
private function parse_comparison(): array { |
| 157 |
$node = $this->parse_expression(); |
| 158 |
|
| 159 |
while ( true ) { |
| 160 |
$operator = $this->match_any( array( '<=', '>=', '<', '>' ) ); |
| 161 |
|
| 162 |
if ( false === $operator ) { |
| 163 |
return $node; |
| 164 |
} |
| 165 |
|
| 166 |
$node = array( 'binary', $operator, $node, $this->parse_expression() ); |
| 167 |
} |
| 168 |
} |
| 169 |
|
| 170 |
/** |
| 171 |
* @throws Gateway_Exception |
| 172 |
*/ |
| 173 |
private function parse_expression(): array { |
| 174 |
$node = $this->parse_term(); |
| 175 |
|
| 176 |
while ( true ) { |
| 177 |
$operator = $this->match_any( array( '+', '-' ) ); |
| 178 |
|
| 179 |
if ( false === $operator ) { |
| 180 |
return $node; |
| 181 |
} |
| 182 |
|
| 183 |
$node = array( 'binary', $operator, $node, $this->parse_term() ); |
| 184 |
} |
| 185 |
} |
| 186 |
|
| 187 |
/** |
| 188 |
* @throws Gateway_Exception |
| 189 |
*/ |
| 190 |
private function parse_term(): array { |
| 191 |
$node = $this->parse_power(); |
| 192 |
|
| 193 |
while ( true ) { |
| 194 |
if ( '*' === $this->peek() && '*' === $this->peek( 1 ) ) { |
| 195 |
return $node; |
| 196 |
} |
| 197 |
|
| 198 |
$operator = $this->match_any( array( '*', '/', '%' ) ); |
| 199 |
|
| 200 |
if ( false === $operator ) { |
| 201 |
return $node; |
| 202 |
} |
| 203 |
|
| 204 |
$node = array( 'binary', $operator, $node, $this->parse_power() ); |
| 205 |
} |
| 206 |
} |
| 207 |
|
| 208 |
/** |
| 209 |
* @throws Gateway_Exception |
| 210 |
*/ |
| 211 |
private function parse_power(): array { |
| 212 |
$node = $this->parse_factor(); |
| 213 |
|
| 214 |
if ( $this->match( '**' ) ) { |
| 215 |
$node = array( 'binary', '**', $node, $this->parse_power() ); |
| 216 |
} |
| 217 |
|
| 218 |
return $node; |
| 219 |
} |
| 220 |
|
| 221 |
/** |
| 222 |
* @throws Gateway_Exception |
| 223 |
*/ |
| 224 |
private function parse_factor(): array { |
| 225 |
$operator = $this->peek(); |
| 226 |
|
| 227 |
if ( '+' === $operator || '-' === $operator || '!' === $operator ) { |
| 228 |
++$this->position; |
| 229 |
|
| 230 |
return array( 'unary', $operator, $this->parse_factor() ); |
| 231 |
} |
| 232 |
|
| 233 |
if ( '(' === $operator ) { |
| 234 |
++$this->position; |
| 235 |
$node = $this->parse_conditional(); |
| 236 |
|
| 237 |
if ( ')' !== $this->peek() ) { |
| 238 |
throw new Gateway_Exception( 'Calculated price expression contains unbalanced parentheses.' ); |
| 239 |
} |
| 240 |
|
| 241 |
++$this->position; |
| 242 |
|
| 243 |
return $node; |
| 244 |
} |
| 245 |
|
| 246 |
if ( false !== $operator && preg_match( '/[a-zA-Z_]/', $operator ) ) { |
| 247 |
return $this->parse_identifier(); |
| 248 |
} |
| 249 |
|
| 250 |
return $this->parse_number(); |
| 251 |
} |
| 252 |
|
| 253 |
/** |
| 254 |
* @throws Gateway_Exception |
| 255 |
*/ |
| 256 |
private function parse_number(): array { |
| 257 |
$remaining = substr( $this->expression, $this->position ); |
| 258 |
|
| 259 |
if ( ! preg_match( '/^(?:(?:[0-9]+(?:\.[0-9]*)?)|(?:\.[0-9]+))(?:[eE][+-]?[0-9]+)?/', $remaining, $matches ) ) { |
| 260 |
throw new Gateway_Exception( 'Calculated price expression contains an invalid token.' ); |
| 261 |
} |
| 262 |
|
| 263 |
$number = $matches[0]; |
| 264 |
$this->position += strlen( $number ); |
| 265 |
|
| 266 |
if ( ! is_numeric( $number ) ) { |
| 267 |
throw new Gateway_Exception( 'Calculated price expression contains an invalid number.' ); |
| 268 |
} |
| 269 |
|
| 270 |
return array( 'number', (float) $number ); |
| 271 |
} |
| 272 |
|
| 273 |
/** |
| 274 |
* @throws Gateway_Exception |
| 275 |
*/ |
| 276 |
private function parse_identifier(): array { |
| 277 |
$remaining = substr( $this->expression, $this->position ); |
| 278 |
|
| 279 |
if ( ! preg_match( '/^[a-zA-Z_][a-zA-Z0-9_]*(?:\.[a-zA-Z_][a-zA-Z0-9_]*)?/', $remaining, $matches ) ) { |
| 280 |
throw new Gateway_Exception( 'Calculated price expression contains an invalid identifier.' ); |
| 281 |
} |
| 282 |
|
| 283 |
$name = $matches[0]; |
| 284 |
$this->position += strlen( $name ); |
| 285 |
|
| 286 |
if ( ! $this->match( '(' ) ) { |
| 287 |
return array( 'constant', $name ); |
| 288 |
} |
| 289 |
|
| 290 |
$arguments = array(); |
| 291 |
|
| 292 |
if ( ! $this->match( ')' ) ) { |
| 293 |
do { |
| 294 |
$arguments[] = $this->parse_conditional(); |
| 295 |
} while ( $this->match( ',' ) ); |
| 296 |
|
| 297 |
if ( ! $this->match( ')' ) ) { |
| 298 |
throw new Gateway_Exception( 'Calculated price expression contains an invalid function call.' ); |
| 299 |
} |
| 300 |
} |
| 301 |
|
| 302 |
return array( 'call', $name, $arguments ); |
| 303 |
} |
| 304 |
|
| 305 |
/** |
| 306 |
* @throws Gateway_Exception |
| 307 |
*/ |
| 308 |
private function evaluate_node( array $node ): float { |
| 309 |
switch ( $node[0] ) { |
| 310 |
case 'number': |
| 311 |
return $node[1]; |
| 312 |
|
| 313 |
case 'constant': |
| 314 |
return $this->evaluate_constant( $node[1] ); |
| 315 |
|
| 316 |
case 'call': |
| 317 |
return $this->evaluate_math_call( $node[1], $node[2] ); |
| 318 |
|
| 319 |
case 'unary': |
| 320 |
$value = $this->evaluate_node( $node[2] ); |
| 321 |
|
| 322 |
if ( '!' === $node[1] ) { |
| 323 |
return $this->is_truthy( $value ) ? 0.0 : 1.0; |
| 324 |
} |
| 325 |
|
| 326 |
return '-' === $node[1] ? -1 * $value : $value; |
| 327 |
|
| 328 |
case 'conditional': |
| 329 |
return $this->is_truthy( $this->evaluate_node( $node[1] ) ) |
| 330 |
? $this->evaluate_node( $node[2] ) |
| 331 |
: $this->evaluate_node( $node[3] ); |
| 332 |
|
| 333 |
case 'binary': |
| 334 |
return $this->evaluate_binary( $node[1], $node[2], $node[3] ); |
| 335 |
} |
| 336 |
|
| 337 |
throw new Gateway_Exception( 'Calculated price expression contains an invalid node.' ); |
| 338 |
} |
| 339 |
|
| 340 |
/** |
| 341 |
* @throws Gateway_Exception |
| 342 |
*/ |
| 343 |
private function validate_node( array $node ): void { |
| 344 |
switch ( $node[0] ) { |
| 345 |
case 'number': |
| 346 |
return; |
| 347 |
|
| 348 |
case 'constant': |
| 349 |
$this->assert_supported_constant( $node[1] ); |
| 350 |
return; |
| 351 |
|
| 352 |
case 'call': |
| 353 |
$this->assert_supported_math_call( $node[1], $node[2] ); |
| 354 |
|
| 355 |
foreach ( $node[2] as $argument ) { |
| 356 |
$this->validate_node( $argument ); |
| 357 |
} |
| 358 |
return; |
| 359 |
|
| 360 |
case 'unary': |
| 361 |
$this->validate_node( $node[2] ); |
| 362 |
return; |
| 363 |
|
| 364 |
case 'conditional': |
| 365 |
$this->validate_node( $node[1] ); |
| 366 |
$this->validate_node( $node[2] ); |
| 367 |
$this->validate_node( $node[3] ); |
| 368 |
return; |
| 369 |
|
| 370 |
case 'binary': |
| 371 |
$this->validate_node( $node[2] ); |
| 372 |
$this->validate_node( $node[3] ); |
| 373 |
return; |
| 374 |
} |
| 375 |
|
| 376 |
throw new Gateway_Exception( 'Calculated price expression contains an invalid node.' ); |
| 377 |
} |
| 378 |
|
| 379 |
/** |
| 380 |
* @throws Gateway_Exception |
| 381 |
*/ |
| 382 |
private function evaluate_binary( string $operator, array $left_node, array $right_node ): float { |
| 383 |
$left = $this->evaluate_node( $left_node ); |
| 384 |
|
| 385 |
if ( '&&' === $operator ) { |
| 386 |
return $this->is_truthy( $left ) ? $this->evaluate_node( $right_node ) : $left; |
| 387 |
} |
| 388 |
|
| 389 |
if ( '||' === $operator ) { |
| 390 |
return $this->is_truthy( $left ) ? $left : $this->evaluate_node( $right_node ); |
| 391 |
} |
| 392 |
|
| 393 |
$right = $this->evaluate_node( $right_node ); |
| 394 |
|
| 395 |
switch ( $operator ) { |
| 396 |
case '+': |
| 397 |
return $left + $right; |
| 398 |
|
| 399 |
case '-': |
| 400 |
return $left - $right; |
| 401 |
|
| 402 |
case '*': |
| 403 |
return $left * $right; |
| 404 |
|
| 405 |
case '/': |
| 406 |
if ( 0.0 === $right ) { |
| 407 |
throw new Gateway_Exception( 'Calculated price expression attempted division by zero.' ); |
| 408 |
} |
| 409 |
|
| 410 |
return $left / $right; |
| 411 |
|
| 412 |
case '%': |
| 413 |
if ( 0.0 === $right ) { |
| 414 |
throw new Gateway_Exception( 'Calculated price expression attempted modulo by zero.' ); |
| 415 |
} |
| 416 |
|
| 417 |
return fmod( $left, $right ); |
| 418 |
|
| 419 |
case '**': |
| 420 |
return $left ** $right; |
| 421 |
|
| 422 |
case '^': |
| 423 |
return (float) ( $this->to_int32( $left ) ^ $this->to_int32( $right ) ); |
| 424 |
|
| 425 |
case '<': |
| 426 |
return $left < $right ? 1.0 : 0.0; |
| 427 |
|
| 428 |
case '<=': |
| 429 |
return $left <= $right ? 1.0 : 0.0; |
| 430 |
|
| 431 |
case '>': |
| 432 |
return $left > $right ? 1.0 : 0.0; |
| 433 |
|
| 434 |
case '>=': |
| 435 |
return $left >= $right ? 1.0 : 0.0; |
| 436 |
|
| 437 |
case '==': |
| 438 |
case '===': |
| 439 |
return $left === $right ? 1.0 : 0.0; |
| 440 |
|
| 441 |
case '!=': |
| 442 |
case '!==': |
| 443 |
return $left !== $right ? 1.0 : 0.0; |
| 444 |
} |
| 445 |
|
| 446 |
throw new Gateway_Exception( 'Calculated price expression contains an unsupported operator.' ); |
| 447 |
} |
| 448 |
|
| 449 |
/** |
| 450 |
* Reproduce JavaScript ToInt32 conversion used by bitwise operators. |
| 451 |
*/ |
| 452 |
private function to_int32( float $value ): int { |
| 453 |
if ( ! is_finite( $value ) || 0.0 === $value ) { |
| 454 |
return 0; |
| 455 |
} |
| 456 |
|
| 457 |
$integer = $value < 0 ? ceil( $value ) : floor( $value ); |
| 458 |
$uint32 = fmod( $integer, 4294967296.0 ); |
| 459 |
|
| 460 |
if ( $uint32 < 0 ) { |
| 461 |
$uint32 += 4294967296.0; |
| 462 |
} |
| 463 |
|
| 464 |
if ( $uint32 >= 2147483648.0 ) { |
| 465 |
$uint32 -= 4294967296.0; |
| 466 |
} |
| 467 |
|
| 468 |
return (int) $uint32; |
| 469 |
} |
| 470 |
|
| 471 |
/** |
| 472 |
* @throws Gateway_Exception |
| 473 |
*/ |
| 474 |
private function evaluate_constant( string $name ): float { |
| 475 |
$constants = $this->get_supported_constants(); |
| 476 |
|
| 477 |
$this->assert_supported_constant( $name ); |
| 478 |
|
| 479 |
return (float) $constants[ $name ]; |
| 480 |
} |
| 481 |
|
| 482 |
private function get_supported_constants(): array { |
| 483 |
return array( |
| 484 |
'true' => 1.0, |
| 485 |
'false' => 0.0, |
| 486 |
'Math.E' => M_E, |
| 487 |
'Math.LN2' => M_LN2, |
| 488 |
'Math.LN10' => M_LN10, |
| 489 |
'Math.LOG2E' => M_LOG2E, |
| 490 |
'Math.LOG10E' => M_LOG10E, |
| 491 |
'Math.PI' => M_PI, |
| 492 |
'Math.SQRT1_2' => M_SQRT1_2, |
| 493 |
'Math.SQRT2' => M_SQRT2, |
| 494 |
); |
| 495 |
} |
| 496 |
|
| 497 |
/** |
| 498 |
* @throws Gateway_Exception |
| 499 |
*/ |
| 500 |
private function assert_supported_constant( string $name ): void { |
| 501 |
if ( ! array_key_exists( $name, $this->get_supported_constants() ) ) { |
| 502 |
throw new Gateway_Exception( 'Calculated price expression contains an unsupported identifier.' ); |
| 503 |
} |
| 504 |
} |
| 505 |
|
| 506 |
/** |
| 507 |
* @throws Gateway_Exception |
| 508 |
*/ |
| 509 |
private function evaluate_math_call( string $name, array $argument_nodes ): float { |
| 510 |
$this->assert_supported_math_call( $name, $argument_nodes ); |
| 511 |
|
| 512 |
$arguments = array_map( |
| 513 |
function ( $node ) { |
| 514 |
return $this->evaluate_node( $node ); |
| 515 |
}, |
| 516 |
$argument_nodes |
| 517 |
); |
| 518 |
|
| 519 |
switch ( $name ) { |
| 520 |
case 'Math.abs': |
| 521 |
$result = abs( $arguments[0] ); |
| 522 |
break; |
| 523 |
|
| 524 |
case 'Math.ceil': |
| 525 |
$result = ceil( $arguments[0] ); |
| 526 |
break; |
| 527 |
|
| 528 |
case 'Math.floor': |
| 529 |
$result = floor( $arguments[0] ); |
| 530 |
break; |
| 531 |
|
| 532 |
case 'Math.round': |
| 533 |
$result = $this->js_math_round( $arguments[0] ); |
| 534 |
break; |
| 535 |
|
| 536 |
case 'Math.trunc': |
| 537 |
$result = $arguments[0] < 0 ? ceil( $arguments[0] ) : floor( $arguments[0] ); |
| 538 |
break; |
| 539 |
|
| 540 |
case 'Math.sign': |
| 541 |
$result = $arguments[0] <=> 0; |
| 542 |
break; |
| 543 |
|
| 544 |
case 'Math.sqrt': |
| 545 |
$result = sqrt( $arguments[0] ); |
| 546 |
break; |
| 547 |
|
| 548 |
case 'Math.pow': |
| 549 |
$result = $arguments[0] ** $arguments[1]; |
| 550 |
break; |
| 551 |
|
| 552 |
case 'Math.min': |
| 553 |
$result = min( $arguments ); |
| 554 |
break; |
| 555 |
|
| 556 |
case 'Math.max': |
| 557 |
$result = max( $arguments ); |
| 558 |
break; |
| 559 |
|
| 560 |
default: |
| 561 |
throw new Gateway_Exception( 'Calculated price expression contains an unsupported function.' ); |
| 562 |
} |
| 563 |
|
| 564 |
if ( ! is_finite( (float) $result ) ) { |
| 565 |
throw new Gateway_Exception( 'Calculated price expression produced a non-finite value.' ); |
| 566 |
} |
| 567 |
|
| 568 |
return (float) $result; |
| 569 |
} |
| 570 |
|
| 571 |
/** |
| 572 |
* @throws Gateway_Exception |
| 573 |
*/ |
| 574 |
private function assert_supported_math_call( string $name, array $arguments ): void { |
| 575 |
switch ( $name ) { |
| 576 |
case 'Math.abs': |
| 577 |
case 'Math.ceil': |
| 578 |
case 'Math.floor': |
| 579 |
case 'Math.round': |
| 580 |
case 'Math.trunc': |
| 581 |
case 'Math.sign': |
| 582 |
case 'Math.sqrt': |
| 583 |
$this->assert_argument_count( $name, $arguments, 1 ); |
| 584 |
return; |
| 585 |
|
| 586 |
case 'Math.pow': |
| 587 |
$this->assert_argument_count( $name, $arguments, 2 ); |
| 588 |
return; |
| 589 |
|
| 590 |
case 'Math.min': |
| 591 |
case 'Math.max': |
| 592 |
$this->assert_argument_count( $name, $arguments, 1, PHP_INT_MAX ); |
| 593 |
return; |
| 594 |
} |
| 595 |
|
| 596 |
throw new Gateway_Exception( 'Calculated price expression contains an unsupported function.' ); |
| 597 |
} |
| 598 |
|
| 599 |
/** |
| 600 |
* Reproduce JavaScript Math.round: round half toward +Infinity. |
| 601 |
* |
| 602 |
* Calling floor( $value + 0.5 ) diverges for values just below .5 (e.g. |
| 603 |
* 0.49999999999999994), where forming $value + 0.5 rounds up to 1.0 and |
| 604 |
* over-rounds. Comparing the fractional part against 0.5 avoids that. |
| 605 |
*/ |
| 606 |
private function js_math_round( float $value ): float { |
| 607 |
$floor = floor( $value ); |
| 608 |
$fraction = $value - $floor; |
| 609 |
|
| 610 |
return $fraction >= 0.5 ? $floor + 1.0 : $floor; |
| 611 |
} |
| 612 |
|
| 613 |
/** |
| 614 |
* @throws Gateway_Exception |
| 615 |
*/ |
| 616 |
private function assert_argument_count( |
| 617 |
string $name, |
| 618 |
array $arguments, |
| 619 |
int $minimum, |
| 620 |
?int $maximum = null |
| 621 |
): void { |
| 622 |
$maximum = null === $maximum ? $minimum : $maximum; |
| 623 |
$count = count( $arguments ); |
| 624 |
|
| 625 |
if ( $count < $minimum || $count > $maximum ) { |
| 626 |
throw new Gateway_Exception( |
| 627 |
sprintf( |
| 628 |
'The "%1$s" function has an invalid number of arguments.', |
| 629 |
esc_html( $name ) |
| 630 |
) |
| 631 |
); |
| 632 |
} |
| 633 |
} |
| 634 |
|
| 635 |
private function is_truthy( float $value ): bool { |
| 636 |
return 0.0 !== $value && ! is_nan( $value ); |
| 637 |
} |
| 638 |
|
| 639 |
private function match( string $token ): bool { |
| 640 |
if ( substr( $this->expression, $this->position, strlen( $token ) ) !== $token ) { |
| 641 |
return false; |
| 642 |
} |
| 643 |
|
| 644 |
$this->position += strlen( $token ); |
| 645 |
|
| 646 |
return true; |
| 647 |
} |
| 648 |
|
| 649 |
/** |
| 650 |
* @return false|string |
| 651 |
*/ |
| 652 |
private function match_any( array $tokens ) { |
| 653 |
foreach ( $tokens as $token ) { |
| 654 |
if ( $this->match( $token ) ) { |
| 655 |
return $token; |
| 656 |
} |
| 657 |
} |
| 658 |
|
| 659 |
return false; |
| 660 |
} |
| 661 |
|
| 662 |
private function peek( int $offset = 0 ) { |
| 663 |
$position = $this->position + $offset; |
| 664 |
|
| 665 |
return $position < $this->length ? $this->expression[ $position ] : false; |
| 666 |
} |
| 667 |
} |
| 668 |
|
