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Define friendlier parse_error messages
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‎GraphQLTree.cpp

Lines changed: 128 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -561,6 +561,134 @@ struct ast_selector<input_object_type_extension>
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{
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};
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template <typename _Rule>
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struct ast_control
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: normal<_Rule>
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{
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static const std::string error_message;
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template <typename _Input, typename... _States>
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static void raise(const _Input& in, _States&&...)
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{
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throw parse_error(error_message, in);
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}
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};
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template <> const std::string ast_control<bof>::error_message = "Expected beginning of file";
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template <> const std::string ast_control<opt<utf8::bom>>::error_message = "Expected optional UTF8 byte-order-mark";
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template <> const std::string ast_control<star<ignored>>::error_message = "Expected optional ignored characters";
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template <> const std::string ast_control<plus<ignored>>::error_message = "Expected ignored characters";
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template <> const std::string ast_control<until<ascii::eolf>>::error_message = "Expected Comment";
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template <> const std::string ast_control<eof>::error_message = "Expected end of file";
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template <> const std::string ast_control<list<definition, plus<ignored>>>::error_message = "Expected list of Definitions";
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template <> const std::string ast_control<selection_set>::error_message = "Expected SelectionSet";
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template <> const std::string ast_control<fragment_name>::error_message = "Expected FragmentName";
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template <> const std::string ast_control<type_condition>::error_message = "Expected TypeCondition";
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template <> const std::string ast_control<opt<seq<star<ignored>, directives>>>::error_message = "Expected optional Directives";
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template <> const std::string ast_control<one<'{'>>::error_message = "Expected {";
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template <> const std::string ast_control<list<root_operation_definition, plus<ignored>>>::error_message = "Expected RootOperationTypeDefinition";
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template <> const std::string ast_control<one<'}'>>::error_message = "Expected }";
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template <> const std::string ast_control<one<'@'>>::error_message = "Expected @";
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template <> const std::string ast_control<directive_name>::error_message = "Expected Directive Name";
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template <> const std::string ast_control<arguments_definition>::error_message = "Expected ArgumentsDefinition";
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template <> const std::string ast_control<on_keyword>::error_message = "Expected \"on\" keyword";
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template <> const std::string ast_control<directive_locations>::error_message = "Expected DirectiveLocations";
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template <> const std::string ast_control<schema_extension>::error_message = "Expected SchemaExtension";
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template <> const std::string ast_control<
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seq<opt<seq<plus<ignored>, operation_name>>, opt<seq<star<ignored>, variable_definitions>>, opt<seq<star<ignored>, directives>>, star<ignored>, selection_set>>::error_message = "Expected OperationDefinition";
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template <> const std::string ast_control<list<selection, plus<ignored>>>::error_message = "Expected Selections";
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template <> const std::string ast_control<scalar_name>::error_message = "Expected ScalarType Name";
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template <> const std::string ast_control<object_name>::error_message = "Expected ObjectType Name";
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template <> const std::string ast_control<
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sor<seq<opt<seq<plus<ignored>, implements_interfaces>>, opt<seq<star<ignored>, directives>>, seq<star<ignored>, fields_definition>>
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, seq<opt<seq<plus<ignored>, implements_interfaces>>, seq<star<ignored>, directives>>
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, opt<seq<plus<ignored>, implements_interfaces>>>>::error_message = "Expected ObjectTypeDefinition";
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template <> const std::string ast_control<interface_name>::error_message = "Expected InterfaceType Name";
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template <> const std::string ast_control<
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sor<seq<opt<seq<star<ignored>, directives>>, seq<star<ignored>, fields_definition>>
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, opt<seq<star<ignored>, directives>>>>::error_message = "Expected InterfaceTypeDefinition";
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template <> const std::string ast_control<
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sor<seq<opt<directives>, one<'{'>, star<ignored>, list<operation_type_definition, plus<ignored>>, star<ignored>, one<'}'>>
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, directives>>::error_message = "Expected SchemaExtension";
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template <> const std::string ast_control<union_name>::error_message = "Expected UnionType Name";
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template <> const std::string ast_control<
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sor<seq<opt<seq<star<ignored>, directives>>, seq<star<ignored>, union_member_types>>
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, opt<seq<star<ignored>, directives>>>>::error_message = "Expected UnionTypeDefinition";
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template <> const std::string ast_control<enum_name>::error_message = "Expected EnumType Name";
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template <> const std::string ast_control<
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sor<seq<opt<seq<star<ignored>, directives>>, seq<star<ignored>, enum_values_definition>>
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, opt<seq<star<ignored>, directives>>>>::error_message = "Expected EnumTypeDefinition";
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template <> const std::string ast_control<
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sor<seq<opt<seq<star<ignored>, directives>>, seq<star<ignored>, input_fields_definition>>
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, opt<seq<star<ignored>, directives>>>>::error_message = "Expected InputObjectTypeDefinition";
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template <> const std::string ast_control<directives>::error_message = "Expected list of Directives";
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template <> const std::string ast_control<
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sor<seq<opt<seq<plus<ignored>, implements_interfaces>>, opt<seq<star<ignored>, directives>>, star<ignored>, fields_definition>
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, seq<opt<seq<plus<ignored>, implements_interfaces>>, star<ignored>, directives>
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, seq<plus<ignored>, implements_interfaces>>>::error_message = "Expected ObjectTypeExtension";
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template <> const std::string ast_control<
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sor<seq<opt<seq<directives, star<ignored>>>, fields_definition>
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, directives>>::error_message = "Expected InterfaceTypeExtension";
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template <> const std::string ast_control<
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sor<seq<opt<seq<directives, star<ignored>>>, union_member_types>
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, directives>>::error_message = "Expected UnionTypeExtension";
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template <> const std::string ast_control<
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sor<seq<opt<seq<directives, star<ignored>>>, enum_values_definition>
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, directives>>::error_message = "Expected EnumTypeExtension";
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template <> const std::string ast_control<
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sor<seq<opt<seq<directives, star<ignored>>>, input_fields_definition>
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, directives>>::error_message = "Expected InputObjectTypeExtension";
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template <> const std::string ast_control<name>::error_message = "Expected Name";
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template <> const std::string ast_control<named_type>::error_message = "Expected NamedType";
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template <> const std::string ast_control<list<input_field_definition, plus<ignored>>>::error_message = "Expected InputValueDefinitions";
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template <> const std::string ast_control<one<')'>>::error_message = "Expected )";
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template <> const std::string ast_control<one<':'>>::error_message = "Expected :";
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template <> const std::string ast_control<
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sor<executable_directive_location
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, type_system_directive_location>>::error_message = "Expected DirectiveLocation";
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template <> const std::string ast_control<opt<seq<star<ignored>, arguments>>>::error_message = "Expected optional Arguments";
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template <> const std::string ast_control<block_quote_token>::error_message = "Expected \"\"\"";
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template <> const std::string ast_control<quote_token>::error_message = "Expected \"";
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template <> const std::string ast_control<
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sor<seq<opt<seq<star<ignored>, arguments>>, opt<seq<star<ignored>, directives>>, seq<star<ignored>, selection_set>>
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, seq<opt<seq<star<ignored>, arguments>>, seq<star<ignored>, directives>>
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, opt<seq<star<ignored>, arguments>>>>::error_message = "Expected Field";
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template <> const std::string ast_control<type_name>::error_message = "Expected Type";
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template <> const std::string ast_control<
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sor<seq<opt<seq<star<ignored>, default_value>>, seq<star<ignored>, directives>>
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, opt<seq<star<ignored>, default_value>>>>::error_message = "Expected InputValueDefinition";
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template <> const std::string ast_control<list<field_definition, plus<ignored>>>::error_message = "Expected FieldsDefinitions";
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template <> const std::string ast_control<opt<seq<star<ignored>, one<'&'>>>>::error_message = "Expected optional '&'";
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template <> const std::string ast_control<list<interface_type, seq<star<ignored>, one<'&'>, star<ignored>>>>::error_message = "Expected ImplementsInterfaces";
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template <> const std::string ast_control<opt<seq<star<ignored>, one<'|'>>>>::error_message = "Expected optional '|'";
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template <> const std::string ast_control<list<union_type, seq<star<ignored>, one<'|'>, star<ignored>>>>::error_message = "Expected UnionMemberTypes";
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template <> const std::string ast_control<list<enum_value_definition, plus<ignored>>>::error_message = "Expected EnumValuesDefinition";
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template <> const std::string ast_control<star<sor<block_escape_sequence, block_quote_character>>>::error_message = "Expected optional BlockStringCharacters";
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template <> const std::string ast_control<star<sor<string_escape_sequence, string_quote_character>>>::error_message = "Expected optional StringCharacters";
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template <> const std::string ast_control<sor<nonnull_type, list_type, named_type>>::error_message = "Expected Type";
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template <> const std::string ast_control<opt<seq<star<ignored>, default_value>>>::error_message = "Expected optional DefaultValue";
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template <> const std::string ast_control<list<variable, plus<ignored>>>::error_message = "Expected VariableDefinitions";
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template <> const std::string ast_control<opt<seq<star<ignored>, arguments_definition>>>::error_message = "Expected optional ArgumentsDefinition";
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template <> const std::string ast_control<list<argument, plus<ignored>>>::error_message = "Expected Arguments";
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template <> const std::string ast_control<one<']'>>::error_message = "Expected ]";
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template <> const std::string ast_control<sor<escaped_unicode, escaped_char>>::error_message = "Expected EscapeSequence";
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template <> const std::string ast_control<input_value>::error_message = "Expected Value";
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template <> const std::string ast_control<
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sor<list_value
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, object_value
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, variable_value
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, integer_value
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, float_value
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, string_value
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, bool_value
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, null_keyword
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, enum_value>>::error_message = "Expected Value";
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template <> const std::string ast_control<rep<4, xdigit>>::error_message = "Expected EscapedUnicode";
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template <> const std::string ast_control<opt<list<list_entry, plus<ignored>>>>::error_message = "Expected optional ListValues";
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template <> const std::string ast_control<opt<list<object_field, plus<ignored>>>>::error_message = "Expected optional ObjectValues";
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template <> const std::string ast_control<plus<digit>>::error_message = "Expected Digits";
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template <> const std::string ast_control<opt<sign>>::error_message = "Expected optional Sign";
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std::unique_ptr<ast<std::string>> parseString(std::string&& input)
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{
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std::unique_ptr<ast<std::string>> result(new ast<std::string> { std::move(input), nullptr });

‎include/GraphQLGrammar.h

Lines changed: 2 additions & 2 deletions
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@@ -594,8 +594,8 @@ struct union_member_types
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// https://facebook.github.io/graphql/June2018/#UnionTypeDefinition
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struct union_type_definition
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: if_must<seq<opt<seq<description, star<ignored>>>, union_keyword>, plus<ignored>, union_name,
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sor<seq<opt<seq<star<ignored>, directives>>, seq<star<ignored>, union_member_types>>,
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opt<seq<star<ignored>, directives>>>>
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sor<seq<opt<seq<star<ignored>, directives>>, seq<star<ignored>, union_member_types>>
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, opt<seq<star<ignored>, directives>>>>
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{
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};
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