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efrain |
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<?php
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namespace JmesPath;
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/**
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* Tree visitor used to compile JMESPath expressions into native PHP code.
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*/
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class TreeCompiler
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{
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private $indentation;
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private $source;
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private $vars;
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/**
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* @param array $ast AST to compile.
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* @param string $fnName The name of the function to generate.
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* @param string $expr Expression being compiled.
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*
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* @return string
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*/
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public function visit(array $ast, $fnName, $expr)
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{
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$this->vars = [];
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$this->source = $this->indentation = '';
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$this->write("<?php\n")
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->write('use JmesPath\\TreeInterpreter as Ti;')
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->write('use JmesPath\\FnDispatcher as Fd;')
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->write('use JmesPath\\Utils;')
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->write('')
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->write('function %s(Ti $interpreter, $value) {', $fnName)
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->indent()
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->dispatch($ast)
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->write('')
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->write('return $value;')
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->outdent()
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->write('}');
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return $this->source;
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}
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/**
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* @param array $node
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* @return mixed
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*/
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private function dispatch(array $node)
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{
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return $this->{"visit_{$node['type']}"}($node);
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}
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/**
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* Creates a monotonically incrementing unique variable name by prefix.
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*
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* @param string $prefix Variable name prefix
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*
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* @return string
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*/
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private function makeVar($prefix)
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{
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if (!isset($this->vars[$prefix])) {
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$this->vars[$prefix] = 0;
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return '$' . $prefix;
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}
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return '$' . $prefix . ++$this->vars[$prefix];
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}
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/**
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* Writes the given line of source code. Pass positional arguments to write
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* that match the format of sprintf.
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*
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* @param string $str String to write
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* @return $this
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*/
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private function write($str)
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{
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$this->source .= $this->indentation;
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if (func_num_args() == 1) {
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$this->source .= $str . "\n";
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return $this;
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}
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$this->source .= vsprintf($str, array_slice(func_get_args(), 1)) . "\n";
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return $this;
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}
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/**
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* Decreases the indentation level of code being written
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* @return $this
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*/
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private function outdent()
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{
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$this->indentation = substr($this->indentation, 0, -4);
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return $this;
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}
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/**
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* Increases the indentation level of code being written
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* @return $this
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*/
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private function indent()
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{
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$this->indentation .= ' ';
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return $this;
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}
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private function visit_or(array $node)
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{
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$a = $this->makeVar('beforeOr');
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return $this
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->write('%s = $value;', $a)
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->dispatch($node['children'][0])
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->write('if (!$value && $value !== "0" && $value !== 0) {')
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->indent()
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->write('$value = %s;', $a)
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->dispatch($node['children'][1])
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->outdent()
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->write('}');
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}
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private function visit_and(array $node)
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{
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$a = $this->makeVar('beforeAnd');
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return $this
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->write('%s = $value;', $a)
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->dispatch($node['children'][0])
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->write('if ($value || $value === "0" || $value === 0) {')
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->indent()
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->write('$value = %s;', $a)
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->dispatch($node['children'][1])
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->outdent()
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->write('}');
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}
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private function visit_not(array $node)
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{
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return $this
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->write('// Visiting not node')
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->dispatch($node['children'][0])
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->write('// Applying boolean not to result of not node')
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->write('$value = !Utils::isTruthy($value);');
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}
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private function visit_subexpression(array $node)
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{
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return $this
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->dispatch($node['children'][0])
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->write('if ($value !== null) {')
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->indent()
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->dispatch($node['children'][1])
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->outdent()
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->write('}');
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}
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private function visit_field(array $node)
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{
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$arr = '$value[' . var_export($node['value'], true) . ']';
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$obj = '$value->{' . var_export($node['value'], true) . '}';
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$this->write('if (is_array($value) || $value instanceof \\ArrayAccess) {')
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->indent()
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->write('$value = isset(%s) ? %s : null;', $arr, $arr)
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->outdent()
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->write('} elseif ($value instanceof \\stdClass) {')
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->indent()
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->write('$value = isset(%s) ? %s : null;', $obj, $obj)
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->outdent()
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->write("} else {")
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->indent()
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->write('$value = null;')
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->outdent()
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->write("}");
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return $this;
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}
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private function visit_index(array $node)
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{
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if ($node['value'] >= 0) {
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$check = '$value[' . $node['value'] . ']';
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return $this->write(
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'$value = (is_array($value) || $value instanceof \\ArrayAccess)'
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. ' && isset(%s) ? %s : null;',
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$check, $check
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);
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}
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$a = $this->makeVar('count');
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return $this
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->write('if (is_array($value) || ($value instanceof \\ArrayAccess && $value instanceof \\Countable)) {')
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->indent()
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->write('%s = count($value) + %s;', $a, $node['value'])
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->write('$value = isset($value[%s]) ? $value[%s] : null;', $a, $a)
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->outdent()
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->write('} else {')
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->indent()
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->write('$value = null;')
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->outdent()
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->write('}');
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}
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private function visit_literal(array $node)
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{
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return $this->write('$value = %s;', var_export($node['value'], true));
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}
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private function visit_pipe(array $node)
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{
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return $this
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->dispatch($node['children'][0])
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->dispatch($node['children'][1]);
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}
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private function visit_multi_select_list(array $node)
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{
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return $this->visit_multi_select_hash($node);
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}
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private function visit_multi_select_hash(array $node)
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{
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$listVal = $this->makeVar('list');
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$value = $this->makeVar('prev');
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$this->write('if ($value !== null) {')
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->indent()
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->write('%s = [];', $listVal)
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->write('%s = $value;', $value);
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$first = true;
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foreach ($node['children'] as $child) {
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if (!$first) {
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$this->write('$value = %s;', $value);
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}
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$first = false;
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if ($node['type'] == 'multi_select_hash') {
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$this->dispatch($child['children'][0]);
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$key = var_export($child['value'], true);
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$this->write('%s[%s] = $value;', $listVal, $key);
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} else {
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$this->dispatch($child);
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$this->write('%s[] = $value;', $listVal);
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}
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}
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return $this
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->write('$value = %s;', $listVal)
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->outdent()
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->write('}');
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}
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private function visit_function(array $node)
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{
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$value = $this->makeVar('val');
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$args = $this->makeVar('args');
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$this->write('%s = $value;', $value)
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->write('%s = [];', $args);
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foreach ($node['children'] as $arg) {
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$this->dispatch($arg);
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$this->write('%s[] = $value;', $args)
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->write('$value = %s;', $value);
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}
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return $this->write(
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'$value = Fd::getInstance()->__invoke("%s", %s);',
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$node['value'], $args
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);
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}
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private function visit_slice(array $node)
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{
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return $this
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->write('$value = !is_string($value) && !Utils::isArray($value)')
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->write(' ? null : Utils::slice($value, %s, %s, %s);',
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var_export($node['value'][0], true),
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var_export($node['value'][1], true),
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var_export($node['value'][2], true)
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);
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}
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private function visit_current(array $node)
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{
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return $this->write('// Visiting current node (no-op)');
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}
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private function visit_expref(array $node)
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{
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$child = var_export($node['children'][0], true);
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return $this->write('$value = function ($value) use ($interpreter) {')
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->indent()
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->write('return $interpreter->visit(%s, $value);', $child)
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->outdent()
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->write('};');
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}
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private function visit_flatten(array $node)
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{
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$this->dispatch($node['children'][0]);
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$merged = $this->makeVar('merged');
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$val = $this->makeVar('val');
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$this
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->write('// Visiting merge node')
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->write('if (!Utils::isArray($value)) {')
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->indent()
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->write('$value = null;')
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->outdent()
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->write('} else {')
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->indent()
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->write('%s = [];', $merged)
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->write('foreach ($value as %s) {', $val)
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->indent()
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->write('if (is_array(%s) && isset(%s[0])) {', $val, $val)
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->indent()
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310 |
->write('%s = array_merge(%s, %s);', $merged, $merged, $val)
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311 |
->outdent()
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312 |
->write('} elseif (%s !== []) {', $val)
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->indent()
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->write('%s[] = %s;', $merged, $val)
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315 |
->outdent()
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316 |
->write('}')
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317 |
->outdent()
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318 |
->write('}')
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319 |
->write('$value = %s;', $merged)
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320 |
->outdent()
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321 |
->write('}');
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322 |
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323 |
return $this;
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324 |
}
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325 |
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326 |
private function visit_projection(array $node)
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327 |
{
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328 |
$val = $this->makeVar('val');
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329 |
$collected = $this->makeVar('collected');
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330 |
$this->write('// Visiting projection node')
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331 |
->dispatch($node['children'][0])
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332 |
->write('');
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333 |
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334 |
if (!isset($node['from'])) {
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335 |
$this->write('if (!is_array($value) || !($value instanceof \stdClass)) { $value = null; }');
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336 |
} elseif ($node['from'] == 'object') {
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337 |
$this->write('if (!Utils::isObject($value)) { $value = null; }');
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338 |
} elseif ($node['from'] == 'array') {
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339 |
$this->write('if (!Utils::isArray($value)) { $value = null; }');
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340 |
}
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341 |
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342 |
$this->write('if ($value !== null) {')
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343 |
->indent()
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344 |
->write('%s = [];', $collected)
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345 |
->write('foreach ((array) $value as %s) {', $val)
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346 |
->indent()
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347 |
->write('$value = %s;', $val)
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348 |
->dispatch($node['children'][1])
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349 |
->write('if ($value !== null) {')
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->indent()
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351 |
->write('%s[] = $value;', $collected)
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352 |
->outdent()
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353 |
->write('}')
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354 |
->outdent()
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355 |
->write('}')
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356 |
->write('$value = %s;', $collected)
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357 |
->outdent()
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358 |
->write('}');
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359 |
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360 |
return $this;
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361 |
}
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362 |
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363 |
private function visit_condition(array $node)
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364 |
{
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365 |
$value = $this->makeVar('beforeCondition');
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366 |
return $this
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367 |
->write('%s = $value;', $value)
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368 |
->write('// Visiting condition node')
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369 |
->dispatch($node['children'][0])
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370 |
->write('// Checking result of condition node')
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371 |
->write('if (Utils::isTruthy($value)) {')
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372 |
->indent()
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|
373 |
->write('$value = %s;', $value)
|
|
|
374 |
->dispatch($node['children'][1])
|
|
|
375 |
->outdent()
|
|
|
376 |
->write('} else {')
|
|
|
377 |
->indent()
|
|
|
378 |
->write('$value = null;')
|
|
|
379 |
->outdent()
|
|
|
380 |
->write('}');
|
|
|
381 |
}
|
|
|
382 |
|
|
|
383 |
private function visit_comparator(array $node)
|
|
|
384 |
{
|
|
|
385 |
$value = $this->makeVar('val');
|
|
|
386 |
$a = $this->makeVar('left');
|
|
|
387 |
$b = $this->makeVar('right');
|
|
|
388 |
|
|
|
389 |
$this
|
|
|
390 |
->write('// Visiting comparator node')
|
|
|
391 |
->write('%s = $value;', $value)
|
|
|
392 |
->dispatch($node['children'][0])
|
|
|
393 |
->write('%s = $value;', $a)
|
|
|
394 |
->write('$value = %s;', $value)
|
|
|
395 |
->dispatch($node['children'][1])
|
|
|
396 |
->write('%s = $value;', $b);
|
|
|
397 |
|
|
|
398 |
if ($node['value'] == '==') {
|
|
|
399 |
$this->write('$value = Utils::isEqual(%s, %s);', $a, $b);
|
|
|
400 |
} elseif ($node['value'] == '!=') {
|
|
|
401 |
$this->write('$value = !Utils::isEqual(%s, %s);', $a, $b);
|
|
|
402 |
} else {
|
|
|
403 |
$this->write(
|
|
|
404 |
'$value = (is_int(%s) || is_float(%s)) && (is_int(%s) || is_float(%s)) && %s %s %s;',
|
|
|
405 |
$a, $a, $b, $b, $a, $node['value'], $b
|
|
|
406 |
);
|
|
|
407 |
}
|
|
|
408 |
|
|
|
409 |
return $this;
|
|
|
410 |
}
|
|
|
411 |
|
|
|
412 |
/** @internal */
|
|
|
413 |
public function __call($method, $args)
|
|
|
414 |
{
|
|
|
415 |
throw new \RuntimeException(
|
|
|
416 |
sprintf('Invalid node encountered: %s', json_encode($args[0]))
|
|
|
417 |
);
|
|
|
418 |
}
|
|
|
419 |
}
|