| 1 |
<?php |
| 2 |
|
| 3 |
namespace Dudlewebs\WPMCS\s3\JmesPath; |
| 4 |
|
| 5 |
/** |
| 6 |
* Tree visitor used to compile JMESPath expressions into native PHP code. |
| 7 |
*/ |
| 8 |
class TreeCompiler |
| 9 |
{ |
| 10 |
private $indentation; |
| 11 |
private $source; |
| 12 |
private $vars; |
| 13 |
/** |
| 14 |
* @param array $ast AST to compile. |
| 15 |
* @param string $fnName The name of the function to generate. |
| 16 |
* @param string $expr Expression being compiled. |
| 17 |
* |
| 18 |
* @return string |
| 19 |
*/ |
| 20 |
public function visit(array $ast, $fnName, $expr) |
| 21 |
{ |
| 22 |
$this->vars = []; |
| 23 |
$this->source = $this->indentation = ''; |
| 24 |
$this->write("<?php\n")->write('use JmesPath\\TreeInterpreter as Ti;')->write('use JmesPath\\FnDispatcher as Fd;')->write('use JmesPath\\Utils;')->write('')->write('function %s(Ti $interpreter, $value) {', $fnName)->indent()->dispatch($ast)->write('')->write('return $value;')->outdent()->write('}'); |
| 25 |
return $this->source; |
| 26 |
} |
| 27 |
/** |
| 28 |
* @param array $node |
| 29 |
* @return mixed |
| 30 |
*/ |
| 31 |
private function dispatch(array $node) |
| 32 |
{ |
| 33 |
return $this->{"visit_{$node['type']}"}($node); |
| 34 |
} |
| 35 |
/** |
| 36 |
* Creates a monotonically incrementing unique variable name by prefix. |
| 37 |
* |
| 38 |
* @param string $prefix Variable name prefix |
| 39 |
* |
| 40 |
* @return string |
| 41 |
*/ |
| 42 |
private function makeVar($prefix) |
| 43 |
{ |
| 44 |
if (!isset($this->vars[$prefix])) { |
| 45 |
$this->vars[$prefix] = 0; |
| 46 |
return '$' . $prefix; |
| 47 |
} |
| 48 |
return '$' . $prefix . ++$this->vars[$prefix]; |
| 49 |
} |
| 50 |
/** |
| 51 |
* Writes the given line of source code. Pass positional arguments to write |
| 52 |
* that match the format of sprintf. |
| 53 |
* |
| 54 |
* @param string $str String to write |
| 55 |
* @return $this |
| 56 |
*/ |
| 57 |
private function write($str) |
| 58 |
{ |
| 59 |
$this->source .= $this->indentation; |
| 60 |
if (\func_num_args() == 1) { |
| 61 |
$this->source .= $str . "\n"; |
| 62 |
return $this; |
| 63 |
} |
| 64 |
$this->source .= \vsprintf($str, \array_slice(\func_get_args(), 1)) . "\n"; |
| 65 |
return $this; |
| 66 |
} |
| 67 |
/** |
| 68 |
* Decreases the indentation level of code being written |
| 69 |
* @return $this |
| 70 |
*/ |
| 71 |
private function outdent() |
| 72 |
{ |
| 73 |
$this->indentation = \substr($this->indentation, 0, -4); |
| 74 |
return $this; |
| 75 |
} |
| 76 |
/** |
| 77 |
* Increases the indentation level of code being written |
| 78 |
* @return $this |
| 79 |
*/ |
| 80 |
private function indent() |
| 81 |
{ |
| 82 |
$this->indentation .= ' '; |
| 83 |
return $this; |
| 84 |
} |
| 85 |
private function visit_or(array $node) |
| 86 |
{ |
| 87 |
$a = $this->makeVar('beforeOr'); |
| 88 |
return $this->write('%s = $value;', $a)->dispatch($node['children'][0])->write('if (!$value && $value !== "0" && $value !== 0) {')->indent()->write('$value = %s;', $a)->dispatch($node['children'][1])->outdent()->write('}'); |
| 89 |
} |
| 90 |
private function visit_and(array $node) |
| 91 |
{ |
| 92 |
$a = $this->makeVar('beforeAnd'); |
| 93 |
return $this->write('%s = $value;', $a)->dispatch($node['children'][0])->write('if ($value || $value === "0" || $value === 0) {')->indent()->write('$value = %s;', $a)->dispatch($node['children'][1])->outdent()->write('}'); |
| 94 |
} |
| 95 |
private function visit_not(array $node) |
| 96 |
{ |
| 97 |
return $this->write('// Visiting not node')->dispatch($node['children'][0])->write('// Applying boolean not to result of not node')->write('$value = !Utils::isTruthy($value);'); |
| 98 |
} |
| 99 |
private function visit_subexpression(array $node) |
| 100 |
{ |
| 101 |
return $this->dispatch($node['children'][0])->write('if ($value !== null) {')->indent()->dispatch($node['children'][1])->outdent()->write('}'); |
| 102 |
} |
| 103 |
private function visit_field(array $node) |
| 104 |
{ |
| 105 |
$arr = '$value[' . \var_export($node['value'], \true) . ']'; |
| 106 |
$obj = '$value->{' . \var_export($node['value'], \true) . '}'; |
| 107 |
$this->write('if (is_array($value) || $value instanceof \\ArrayAccess) {')->indent()->write('$value = isset(%s) ? %s : null;', $arr, $arr)->outdent()->write('} elseif ($value instanceof \\stdClass) {')->indent()->write('$value = isset(%s) ? %s : null;', $obj, $obj)->outdent()->write("} else {")->indent()->write('$value = null;')->outdent()->write("}"); |
| 108 |
return $this; |
| 109 |
} |
| 110 |
private function visit_index(array $node) |
| 111 |
{ |
| 112 |
if ($node['value'] >= 0) { |
| 113 |
$check = '$value[' . $node['value'] . ']'; |
| 114 |
return $this->write('$value = (is_array($value) || $value instanceof \\ArrayAccess)' . ' && isset(%s) ? %s : null;', $check, $check); |
| 115 |
} |
| 116 |
$a = $this->makeVar('count'); |
| 117 |
return $this->write('if (is_array($value) || ($value instanceof \\ArrayAccess && $value instanceof \\Countable)) {')->indent()->write('%s = count($value) + %s;', $a, $node['value'])->write('$value = isset($value[%s]) ? $value[%s] : null;', $a, $a)->outdent()->write('} else {')->indent()->write('$value = null;')->outdent()->write('}'); |
| 118 |
} |
| 119 |
private function visit_literal(array $node) |
| 120 |
{ |
| 121 |
return $this->write('$value = %s;', \var_export($node['value'], \true)); |
| 122 |
} |
| 123 |
private function visit_pipe(array $node) |
| 124 |
{ |
| 125 |
return $this->dispatch($node['children'][0])->dispatch($node['children'][1]); |
| 126 |
} |
| 127 |
private function visit_multi_select_list(array $node) |
| 128 |
{ |
| 129 |
return $this->visit_multi_select_hash($node); |
| 130 |
} |
| 131 |
private function visit_multi_select_hash(array $node) |
| 132 |
{ |
| 133 |
$listVal = $this->makeVar('list'); |
| 134 |
$value = $this->makeVar('prev'); |
| 135 |
$this->write('if ($value !== null) {')->indent()->write('%s = [];', $listVal)->write('%s = $value;', $value); |
| 136 |
$first = \true; |
| 137 |
foreach ($node['children'] as $child) { |
| 138 |
if (!$first) { |
| 139 |
$this->write('$value = %s;', $value); |
| 140 |
} |
| 141 |
$first = \false; |
| 142 |
if ($node['type'] == 'multi_select_hash') { |
| 143 |
$this->dispatch($child['children'][0]); |
| 144 |
$key = \var_export($child['value'], \true); |
| 145 |
$this->write('%s[%s] = $value;', $listVal, $key); |
| 146 |
} else { |
| 147 |
$this->dispatch($child); |
| 148 |
$this->write('%s[] = $value;', $listVal); |
| 149 |
} |
| 150 |
} |
| 151 |
return $this->write('$value = %s;', $listVal)->outdent()->write('}'); |
| 152 |
} |
| 153 |
private function visit_function(array $node) |
| 154 |
{ |
| 155 |
$value = $this->makeVar('val'); |
| 156 |
$args = $this->makeVar('args'); |
| 157 |
$this->write('%s = $value;', $value)->write('%s = [];', $args); |
| 158 |
foreach ($node['children'] as $arg) { |
| 159 |
$this->dispatch($arg); |
| 160 |
$this->write('%s[] = $value;', $args)->write('$value = %s;', $value); |
| 161 |
} |
| 162 |
return $this->write('$value = Fd::getInstance()->__invoke("%s", %s);', $node['value'], $args); |
| 163 |
} |
| 164 |
private function visit_slice(array $node) |
| 165 |
{ |
| 166 |
return $this->write('$value = !is_string($value) && !Utils::isArray($value)')->write(' ? null : Utils::slice($value, %s, %s, %s);', \var_export($node['value'][0], \true), \var_export($node['value'][1], \true), \var_export($node['value'][2], \true)); |
| 167 |
} |
| 168 |
private function visit_current(array $node) |
| 169 |
{ |
| 170 |
return $this->write('// Visiting current node (no-op)'); |
| 171 |
} |
| 172 |
private function visit_expref(array $node) |
| 173 |
{ |
| 174 |
$child = \var_export($node['children'][0], \true); |
| 175 |
return $this->write('$value = function ($value) use ($interpreter) {')->indent()->write('return $interpreter->visit(%s, $value);', $child)->outdent()->write('};'); |
| 176 |
} |
| 177 |
private function visit_flatten(array $node) |
| 178 |
{ |
| 179 |
$this->dispatch($node['children'][0]); |
| 180 |
$merged = $this->makeVar('merged'); |
| 181 |
$val = $this->makeVar('val'); |
| 182 |
$this->write('// Visiting merge node')->write('if (!Utils::isArray($value)) {')->indent()->write('$value = null;')->outdent()->write('} else {')->indent()->write('%s = [];', $merged)->write('foreach ($value as %s) {', $val)->indent()->write('if (is_array(%s) && isset(%s[0])) {', $val, $val)->indent()->write('%s = array_merge(%s, %s);', $merged, $merged, $val)->outdent()->write('} elseif (%s !== []) {', $val)->indent()->write('%s[] = %s;', $merged, $val)->outdent()->write('}')->outdent()->write('}')->write('$value = %s;', $merged)->outdent()->write('}'); |
| 183 |
return $this; |
| 184 |
} |
| 185 |
private function visit_projection(array $node) |
| 186 |
{ |
| 187 |
$val = $this->makeVar('val'); |
| 188 |
$collected = $this->makeVar('collected'); |
| 189 |
$this->write('// Visiting projection node')->dispatch($node['children'][0])->write(''); |
| 190 |
if (!isset($node['from'])) { |
| 191 |
$this->write('if (!is_array($value) || !($value instanceof \\stdClass)) { $value = null; }'); |
| 192 |
} elseif ($node['from'] == 'object') { |
| 193 |
$this->write('if (!Utils::isObject($value)) { $value = null; }'); |
| 194 |
} elseif ($node['from'] == 'array') { |
| 195 |
$this->write('if (!Utils::isArray($value)) { $value = null; }'); |
| 196 |
} |
| 197 |
$this->write('if ($value !== null) {')->indent()->write('%s = [];', $collected)->write('foreach ((array) $value as %s) {', $val)->indent()->write('$value = %s;', $val)->dispatch($node['children'][1])->write('if ($value !== null) {')->indent()->write('%s[] = $value;', $collected)->outdent()->write('}')->outdent()->write('}')->write('$value = %s;', $collected)->outdent()->write('}'); |
| 198 |
return $this; |
| 199 |
} |
| 200 |
private function visit_condition(array $node) |
| 201 |
{ |
| 202 |
$value = $this->makeVar('beforeCondition'); |
| 203 |
return $this->write('%s = $value;', $value)->write('// Visiting condition node')->dispatch($node['children'][0])->write('// Checking result of condition node')->write('if (Utils::isTruthy($value)) {')->indent()->write('$value = %s;', $value)->dispatch($node['children'][1])->outdent()->write('} else {')->indent()->write('$value = null;')->outdent()->write('}'); |
| 204 |
} |
| 205 |
private function visit_comparator(array $node) |
| 206 |
{ |
| 207 |
$value = $this->makeVar('val'); |
| 208 |
$a = $this->makeVar('left'); |
| 209 |
$b = $this->makeVar('right'); |
| 210 |
$this->write('// Visiting comparator node')->write('%s = $value;', $value)->dispatch($node['children'][0])->write('%s = $value;', $a)->write('$value = %s;', $value)->dispatch($node['children'][1])->write('%s = $value;', $b); |
| 211 |
if ($node['value'] == '==') { |
| 212 |
$this->write('$value = Utils::isEqual(%s, %s);', $a, $b); |
| 213 |
} elseif ($node['value'] == '!=') { |
| 214 |
$this->write('$value = !Utils::isEqual(%s, %s);', $a, $b); |
| 215 |
} else { |
| 216 |
$this->write('$value = (is_int(%s) || is_float(%s)) && (is_int(%s) || is_float(%s)) && %s %s %s;', $a, $a, $b, $b, $a, $node['value'], $b); |
| 217 |
} |
| 218 |
return $this; |
| 219 |
} |
| 220 |
/** @internal */ |
| 221 |
public function __call($method, $args) |
| 222 |
{ |
| 223 |
throw new \RuntimeException(\sprintf('Invalid node encountered: %s', \json_encode($args[0]))); |
| 224 |
} |
| 225 |
} |
| 226 |
|
