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<?php
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namespace GraphQL\Language;
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use GraphQL\Language\AST\ArgumentNode;
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use GraphQL\Language\AST\DirectiveDefinitionNode;
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use GraphQL\Language\AST\EnumTypeDefinitionNode;
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use GraphQL\Language\AST\EnumValueDefinitionNode;
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use GraphQL\Language\AST\FieldDefinitionNode;
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use GraphQL\Language\AST\InputObjectTypeDefinitionNode;
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use GraphQL\Language\AST\InputValueDefinitionNode;
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use GraphQL\Language\AST\InterfaceTypeDefinitionNode;
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use GraphQL\Language\AST\ListValueNode;
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use GraphQL\Language\AST\BooleanValueNode;
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use GraphQL\Language\AST\DirectiveNode;
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use GraphQL\Language\AST\DocumentNode;
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use GraphQL\Language\AST\EnumValueNode;
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use GraphQL\Language\AST\FieldNode;
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use GraphQL\Language\AST\FloatValueNode;
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use GraphQL\Language\AST\FragmentDefinitionNode;
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use GraphQL\Language\AST\FragmentSpreadNode;
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use GraphQL\Language\AST\InlineFragmentNode;
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use GraphQL\Language\AST\IntValueNode;
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use GraphQL\Language\AST\ListTypeNode;
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use GraphQL\Language\AST\NamedTypeNode;
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use GraphQL\Language\AST\Node;
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use GraphQL\Language\AST\NodeKind;
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use GraphQL\Language\AST\NonNullTypeNode;
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use GraphQL\Language\AST\NullValueNode;
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use GraphQL\Language\AST\ObjectFieldNode;
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use GraphQL\Language\AST\ObjectTypeDefinitionNode;
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use GraphQL\Language\AST\ObjectValueNode;
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use GraphQL\Language\AST\OperationDefinitionNode;
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use GraphQL\Language\AST\OperationTypeDefinitionNode;
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use GraphQL\Language\AST\ScalarTypeDefinitionNode;
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use GraphQL\Language\AST\SchemaDefinitionNode;
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use GraphQL\Language\AST\SelectionSetNode;
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use GraphQL\Language\AST\StringValueNode;
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use GraphQL\Language\AST\TypeExtensionDefinitionNode;
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use GraphQL\Language\AST\UnionTypeDefinitionNode;
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use GraphQL\Language\AST\VariableDefinitionNode;
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use GraphQL\Utils\Utils;
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/**
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* Prints AST to string. Capable of printing GraphQL queries and Type definition language.
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* Useful for pretty-printing queries or printing back AST for logging, documentation, etc.
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*
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* Usage example:
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*
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* ```php
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* $query = 'query myQuery {someField}';
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* $ast = GraphQL\Language\Parser::parse($query);
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* $printed = GraphQL\Language\Printer::doPrint($ast);
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* ```
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*/
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class Printer
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{
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/**
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* Prints AST to string. Capable of printing GraphQL queries and Type definition language.
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*
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* @api
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* @param Node $ast
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* @return string
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*/
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public static function doPrint($ast)
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{
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static $instance;
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$instance = $instance ?: new static();
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return $instance->printAST($ast);
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}
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protected function __construct()
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{}
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public function printAST($ast)
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{
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return Visitor::visit($ast, [
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'leave' => [
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NodeKind::NAME => function(Node $node) {
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return '' . $node->value;
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},
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NodeKind::VARIABLE => function($node) {
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return '$' . $node->name;
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},
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NodeKind::DOCUMENT => function(DocumentNode $node) {
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return $this->join($node->definitions, "\n\n") . "\n";
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},
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NodeKind::OPERATION_DEFINITION => function(OperationDefinitionNode $node) {
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$op = $node->operation;
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$name = $node->name;
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$varDefs = $this->wrap('(', $this->join($node->variableDefinitions, ', '), ')');
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$directives = $this->join($node->directives, ' ');
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$selectionSet = $node->selectionSet;
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// Anonymous queries with no directives or variable definitions can use
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// the query short form.
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return !$name && !$directives && !$varDefs && $op === 'query'
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? $selectionSet
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: $this->join([$op, $this->join([$name, $varDefs]), $directives, $selectionSet], ' ');
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},
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NodeKind::VARIABLE_DEFINITION => function(VariableDefinitionNode $node) {
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return $node->variable . ': ' . $node->type . $this->wrap(' = ', $node->defaultValue);
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},
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NodeKind::SELECTION_SET => function(SelectionSetNode $node) {
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return $this->block($node->selections);
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},
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NodeKind::FIELD => function(FieldNode $node) {
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return $this->join([
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$this->wrap('', $node->alias, ': ') . $node->name . $this->wrap('(', $this->join($node->arguments, ', '), ')'),
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$this->join($node->directives, ' '),
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$node->selectionSet
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], ' ');
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},
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NodeKind::ARGUMENT => function(ArgumentNode $node) {
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return $node->name . ': ' . $node->value;
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},
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// Fragments
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NodeKind::FRAGMENT_SPREAD => function(FragmentSpreadNode $node) {
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return '...' . $node->name . $this->wrap(' ', $this->join($node->directives, ' '));
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},
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NodeKind::INLINE_FRAGMENT => function(InlineFragmentNode $node) {
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return $this->join([
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"...",
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$this->wrap('on ', $node->typeCondition),
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$this->join($node->directives, ' '),
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$node->selectionSet
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], ' ');
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},
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NodeKind::FRAGMENT_DEFINITION => function(FragmentDefinitionNode $node) {
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return "fragment {$node->name} on {$node->typeCondition} "
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. $this->wrap('', $this->join($node->directives, ' '), ' ')
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. $node->selectionSet;
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},
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// Value
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NodeKind::INT => function(IntValueNode $node) {
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return $node->value;
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},
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NodeKind::FLOAT => function(FloatValueNode $node) {
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return $node->value;
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},
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NodeKind::STRING => function(StringValueNode $node) {
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return json_encode($node->value);
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},
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NodeKind::BOOLEAN => function(BooleanValueNode $node) {
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return $node->value ? 'true' : 'false';
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},
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NodeKind::NULL => function(NullValueNode $node) {
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return 'null';
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},
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NodeKind::ENUM => function(EnumValueNode $node) {
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return $node->value;
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},
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NodeKind::LST => function(ListValueNode $node) {
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return '[' . $this->join($node->values, ', ') . ']';
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},
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NodeKind::OBJECT => function(ObjectValueNode $node) {
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return '{' . $this->join($node->fields, ', ') . '}';
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},
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NodeKind::OBJECT_FIELD => function(ObjectFieldNode $node) {
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return $node->name . ': ' . $node->value;
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},
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// DirectiveNode
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NodeKind::DIRECTIVE => function(DirectiveNode $node) {
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return '@' . $node->name . $this->wrap('(', $this->join($node->arguments, ', '), ')');
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},
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// Type
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NodeKind::NAMED_TYPE => function(NamedTypeNode $node) {
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return $node->name;
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},
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NodeKind::LIST_TYPE => function(ListTypeNode $node) {
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return '[' . $node->type . ']';
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},
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NodeKind::NON_NULL_TYPE => function(NonNullTypeNode $node) {
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return $node->type . '!';
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},
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// Type System Definitions
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NodeKind::SCHEMA_DEFINITION => function(SchemaDefinitionNode $def) {
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return $this->join([
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'schema',
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$this->join($def->directives, ' '),
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$this->block($def->operationTypes)
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], ' ');
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},
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NodeKind::OPERATION_TYPE_DEFINITION => function(OperationTypeDefinitionNode $def) {
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return $def->operation . ': ' . $def->type;
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},
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NodeKind::SCALAR_TYPE_DEFINITION => function(ScalarTypeDefinitionNode $def) {
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return $this->join(['scalar', $def->name, $this->join($def->directives, ' ')], ' ');
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},
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NodeKind::OBJECT_TYPE_DEFINITION => function(ObjectTypeDefinitionNode $def) {
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return $this->join([
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'type',
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$def->name,
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$this->wrap('implements ', $this->join($def->interfaces, ', ')),
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$this->join($def->directives, ' '),
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$this->block($def->fields)
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], ' ');
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},
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NodeKind::FIELD_DEFINITION => function(FieldDefinitionNode $def) {
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return $def->name
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. $this->wrap('(', $this->join($def->arguments, ', '), ')')
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. ': ' . $def->type
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. $this->wrap(' ', $this->join($def->directives, ' '));
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},
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NodeKind::INPUT_VALUE_DEFINITION => function(InputValueDefinitionNode $def) {
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return $this->join([
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$def->name . ': ' . $def->type,
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$this->wrap('= ', $def->defaultValue),
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$this->join($def->directives, ' ')
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], ' ');
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},
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NodeKind::INTERFACE_TYPE_DEFINITION => function(InterfaceTypeDefinitionNode $def) {
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return $this->join([
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'interface',
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$def->name,
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$this->join($def->directives, ' '),
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$this->block($def->fields)
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], ' ');
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},
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NodeKind::UNION_TYPE_DEFINITION => function(UnionTypeDefinitionNode $def) {
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return $this->join([
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'union',
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$def->name,
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$this->join($def->directives, ' '),
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'= ' . $this->join($def->types, ' | ')
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], ' ');
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},
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NodeKind::ENUM_TYPE_DEFINITION => function(EnumTypeDefinitionNode $def) {
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return $this->join([
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'enum',
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$def->name,
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$this->join($def->directives, ' '),
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$this->block($def->values)
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], ' ');
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},
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NodeKind::ENUM_VALUE_DEFINITION => function(EnumValueDefinitionNode $def) {
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return $this->join([
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$def->name,
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$this->join($def->directives, ' ')
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], ' ');
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},
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NodeKind::INPUT_OBJECT_TYPE_DEFINITION => function(InputObjectTypeDefinitionNode $def) {
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return $this->join([
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'input',
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$def->name,
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$this->join($def->directives, ' '),
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$this->block($def->fields)
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], ' ');
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},
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NodeKind::TYPE_EXTENSION_DEFINITION => function(TypeExtensionDefinitionNode $def) {
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return "extend {$def->definition}";
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},
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NodeKind::DIRECTIVE_DEFINITION => function(DirectiveDefinitionNode $def) {
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return 'directive @' . $def->name . $this->wrap('(', $this->join($def->arguments, ', '), ')')
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. ' on ' . $this->join($def->locations, ' | ');
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}
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]
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]);
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}
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/**
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* If maybeString is not null or empty, then wrap with start and end, otherwise
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* print an empty string.
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*/
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public function wrap($start, $maybeString, $end = '')
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{
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return $maybeString ? ($start . $maybeString . $end) : '';
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}
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/**
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* Given array, print each item on its own line, wrapped in an
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* indented "{ }" block.
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*/
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public function block($array)
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{
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return $array && $this->length($array) ? $this->indent("{\n" . $this->join($array, "\n")) . "\n}" : '{}';
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}
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public function indent($maybeString)
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{
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return $maybeString ? str_replace("\n", "\n ", $maybeString) : '';
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}
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public function manyList($start, $list, $separator, $end)
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{
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return $this->length($list) === 0 ? null : ($start . $this->join($list, $separator) . $end);
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}
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public function length($maybeArray)
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{
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return $maybeArray ? count($maybeArray) : 0;
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}
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public function join($maybeArray, $separator = '')
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{
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return $maybeArray
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? implode(
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$separator,
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Utils::filter(
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$maybeArray,
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function($x) { return !!$x;}
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)
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)
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: '';
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}
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}
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