graphql/language/printer.mjs

import { visit } from './visitor';
import { printBlockString } from './blockString';
/**
 * Converts an AST into a string, using one set of reasonable
 * formatting rules.
 */

export function print(ast) {
  return visit(ast, {
    leave: printDocASTReducer
  });
} // TODO: provide better type coverage in future

var printDocASTReducer = {
  Name: function Name(node) {
    return node.value;
  },
  Variable: function Variable(node) {
    return '$' + node.name;
  },
  // Document
  Document: function Document(node) {
    return join(node.definitions, '\n\n') + '\n';
  },
  OperationDefinition: function OperationDefinition(node) {
    var op = node.operation;
    var name = node.name;
    var varDefs = wrap('(', join(node.variableDefinitions, ', '), ')');
    var directives = join(node.directives, ' ');
    var selectionSet = node.selectionSet; // Anonymous queries with no directives or variable definitions can use
    // the query short form.

    return !name && !directives && !varDefs && op === 'query' ? selectionSet : join([op, join([name, varDefs]), directives, selectionSet], ' ');
  },
  VariableDefinition: function VariableDefinition(_ref) {
    var variable = _ref.variable,
        type = _ref.type,
        defaultValue = _ref.defaultValue,
        directives = _ref.directives;
    return variable + ': ' + type + wrap(' = ', defaultValue) + wrap(' ', join(directives, ' '));
  },
  SelectionSet: function SelectionSet(_ref2) {
    var selections = _ref2.selections;
    return block(selections);
  },
  Field: function Field(_ref3) {
    var alias = _ref3.alias,
        name = _ref3.name,
        args = _ref3.arguments,
        directives = _ref3.directives,
        selectionSet = _ref3.selectionSet;
    return join([wrap('', alias, ': ') + name + wrap('(', join(args, ', '), ')'), join(directives, ' '), selectionSet], ' ');
  },
  Argument: function Argument(_ref4) {
    var name = _ref4.name,
        value = _ref4.value;
    return name + ': ' + value;
  },
  // Fragments
  FragmentSpread: function FragmentSpread(_ref5) {
    var name = _ref5.name,
        directives = _ref5.directives;
    return '...' + name + wrap(' ', join(directives, ' '));
  },
  InlineFragment: function InlineFragment(_ref6) {
    var typeCondition = _ref6.typeCondition,
        directives = _ref6.directives,
        selectionSet = _ref6.selectionSet;
    return join(['...', wrap('on ', typeCondition), join(directives, ' '), selectionSet], ' ');
  },
  FragmentDefinition: function FragmentDefinition(_ref7) {
    var name = _ref7.name,
        typeCondition = _ref7.typeCondition,
        variableDefinitions = _ref7.variableDefinitions,
        directives = _ref7.directives,
        selectionSet = _ref7.selectionSet;
    return (// Note: fragment variable definitions are experimental and may be changed
      // or removed in the future.
      "fragment ".concat(name).concat(wrap('(', join(variableDefinitions, ', '), ')'), " ") + "on ".concat(typeCondition, " ").concat(wrap('', join(directives, ' '), ' ')) + selectionSet
    );
  },
  // Value
  IntValue: function IntValue(_ref8) {
    var value = _ref8.value;
    return value;
  },
  FloatValue: function FloatValue(_ref9) {
    var value = _ref9.value;
    return value;
  },
  StringValue: function StringValue(_ref10, key) {
    var value = _ref10.value,
        isBlockString = _ref10.block;
    return isBlockString ? printBlockString(value, key === 'description' ? '' : '  ') : JSON.stringify(value);
  },
  BooleanValue: function BooleanValue(_ref11) {
    var value = _ref11.value;
    return value ? 'true' : 'false';
  },
  NullValue: function NullValue() {
    return 'null';
  },
  EnumValue: function EnumValue(_ref12) {
    var value = _ref12.value;
    return value;
  },
  ListValue: function ListValue(_ref13) {
    var values = _ref13.values;
    return '[' + join(values, ', ') + ']';
  },
  ObjectValue: function ObjectValue(_ref14) {
    var fields = _ref14.fields;
    return '{' + join(fields, ', ') + '}';
  },
  ObjectField: function ObjectField(_ref15) {
    var name = _ref15.name,
        value = _ref15.value;
    return name + ': ' + value;
  },
  // Directive
  Directive: function Directive(_ref16) {
    var name = _ref16.name,
        args = _ref16.arguments;
    return '@' + name + wrap('(', join(args, ', '), ')');
  },
  // Type
  NamedType: function NamedType(_ref17) {
    var name = _ref17.name;
    return name;
  },
  ListType: function ListType(_ref18) {
    var type = _ref18.type;
    return '[' + type + ']';
  },
  NonNullType: function NonNullType(_ref19) {
    var type = _ref19.type;
    return type + '!';
  },
  // Type System Definitions
  SchemaDefinition: function SchemaDefinition(_ref20) {
    var directives = _ref20.directives,
        operationTypes = _ref20.operationTypes;
    return join(['schema', join(directives, ' '), block(operationTypes)], ' ');
  },
  OperationTypeDefinition: function OperationTypeDefinition(_ref21) {
    var operation = _ref21.operation,
        type = _ref21.type;
    return operation + ': ' + type;
  },
  ScalarTypeDefinition: addDescription(function (_ref22) {
    var name = _ref22.name,
        directives = _ref22.directives;
    return join(['scalar', name, join(directives, ' ')], ' ');
  }),
  ObjectTypeDefinition: addDescription(function (_ref23) {
    var name = _ref23.name,
        interfaces = _ref23.interfaces,
        directives = _ref23.directives,
        fields = _ref23.fields;
    return join(['type', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' ');
  }),
  FieldDefinition: addDescription(function (_ref24) {
    var name = _ref24.name,
        args = _ref24.arguments,
        type = _ref24.type,
        directives = _ref24.directives;
    return name + (hasMultilineItems(args) ? wrap('(\n', indent(join(args, '\n')), '\n)') : wrap('(', join(args, ', '), ')')) + ': ' + type + wrap(' ', join(directives, ' '));
  }),
  InputValueDefinition: addDescription(function (_ref25) {
    var name = _ref25.name,
        type = _ref25.type,
        defaultValue = _ref25.defaultValue,
        directives = _ref25.directives;
    return join([name + ': ' + type, wrap('= ', defaultValue), join(directives, ' ')], ' ');
  }),
  InterfaceTypeDefinition: addDescription(function (_ref26) {
    var name = _ref26.name,
        directives = _ref26.directives,
        fields = _ref26.fields;
    return join(['interface', name, join(directives, ' '), block(fields)], ' ');
  }),
  UnionTypeDefinition: addDescription(function (_ref27) {
    var name = _ref27.name,
        directives = _ref27.directives,
        types = _ref27.types;
    return join(['union', name, join(directives, ' '), types && types.length !== 0 ? '= ' + join(types, ' | ') : ''], ' ');
  }),
  EnumTypeDefinition: addDescription(function (_ref28) {
    var name = _ref28.name,
        directives = _ref28.directives,
        values = _ref28.values;
    return join(['enum', name, join(directives, ' '), block(values)], ' ');
  }),
  EnumValueDefinition: addDescription(function (_ref29) {
    var name = _ref29.name,
        directives = _ref29.directives;
    return join([name, join(directives, ' ')], ' ');
  }),
  InputObjectTypeDefinition: addDescription(function (_ref30) {
    var name = _ref30.name,
        directives = _ref30.directives,
        fields = _ref30.fields;
    return join(['input', name, join(directives, ' '), block(fields)], ' ');
  }),
  DirectiveDefinition: addDescription(function (_ref31) {
    var name = _ref31.name,
        args = _ref31.arguments,
        repeatable = _ref31.repeatable,
        locations = _ref31.locations;
    return 'directive @' + name + (hasMultilineItems(args) ? wrap('(\n', indent(join(args, '\n')), '\n)') : wrap('(', join(args, ', '), ')')) + (repeatable ? ' repeatable' : '') + ' on ' + join(locations, ' | ');
  }),
  SchemaExtension: function SchemaExtension(_ref32) {
    var directives = _ref32.directives,
        operationTypes = _ref32.operationTypes;
    return join(['extend schema', join(directives, ' '), block(operationTypes)], ' ');
  },
  ScalarTypeExtension: function ScalarTypeExtension(_ref33) {
    var name = _ref33.name,
        directives = _ref33.directives;
    return join(['extend scalar', name, join(directives, ' ')], ' ');
  },
  ObjectTypeExtension: function ObjectTypeExtension(_ref34) {
    var name = _ref34.name,
        interfaces = _ref34.interfaces,
        directives = _ref34.directives,
        fields = _ref34.fields;
    return join(['extend type', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' ');
  },
  InterfaceTypeExtension: function InterfaceTypeExtension(_ref35) {
    var name = _ref35.name,
        directives = _ref35.directives,
        fields = _ref35.fields;
    return join(['extend interface', name, join(directives, ' '), block(fields)], ' ');
  },
  UnionTypeExtension: function UnionTypeExtension(_ref36) {
    var name = _ref36.name,
        directives = _ref36.directives,
        types = _ref36.types;
    return join(['extend union', name, join(directives, ' '), types && types.length !== 0 ? '= ' + join(types, ' | ') : ''], ' ');
  },
  EnumTypeExtension: function EnumTypeExtension(_ref37) {
    var name = _ref37.name,
        directives = _ref37.directives,
        values = _ref37.values;
    return join(['extend enum', name, join(directives, ' '), block(values)], ' ');
  },
  InputObjectTypeExtension: function InputObjectTypeExtension(_ref38) {
    var name = _ref38.name,
        directives = _ref38.directives,
        fields = _ref38.fields;
    return join(['extend input', name, join(directives, ' '), block(fields)], ' ');
  }
};

function addDescription(cb) {
  return function (node) {
    return join([node.description, cb(node)], '\n');
  };
}
/**
 * Given maybeArray, print an empty string if it is null or empty, otherwise
 * print all items together separated by separator if provided
 */


function join(maybeArray, separator) {
  return maybeArray ? maybeArray.filter(function (x) {
    return x;
  }).join(separator || '') : '';
}
/**
 * Given array, print each item on its own line, wrapped in an
 * indented "{ }" block.
 */


function block(array) {
  return array && array.length !== 0 ? '{\n' + indent(join(array, '\n')) + '\n}' : '';
}
/**
 * If maybeString is not null or empty, then wrap with start and end, otherwise
 * print an empty string.
 */


function wrap(start, maybeString, end) {
  return maybeString ? start + maybeString + (end || '') : '';
}

function indent(maybeString) {
  return maybeString && '  ' + maybeString.replace(/\n/g, '\n  ');
}

function isMultiline(string) {
  return string.indexOf('\n') !== -1;
}

function hasMultilineItems(maybeArray) {
  return maybeArray && maybeArray.some(isMultiline);
}