{{/*
 Copyright 2021 The Dawn Authors

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
*/}}

{{- /*
--------------------------------------------------------------------------------
Template file for use with tools/src/cmd/idlgen/main.go.
This file provides common template definitions and is included by WebGPU.h.tmpl
and WebGPU.cpp.tmpl.

See:
* https://github.com/ben-clayton/webidlparser/blob/main/ast/ast.go for the AST
  types used by this template
* tools/src/cmd/idlgen/main.go for additional structures and functions used by
  this template
* https://golang.org/pkg/text/template/ for documentation on the template syntax
--------------------------------------------------------------------------------
*/ -}}


{{- /*
--------------------------------------------------------------------------------
-- Type generates the C++ type for the given ast.Type
--------------------------------------------------------------------------------
*/ -}}
{{- define "Type" -}}
{{-        if IsUndefinedType $}}void
{{-   else if IsTypeName      $}}
{{-          if eq $.Name "boolean"             }}bool
{{-     else if eq $.Name "short"               }}int16_t
{{-     else if eq $.Name "unsigned short"      }}uint16_t
{{-     else if eq $.Name "long"                }}int32_t
{{-     else if eq $.Name "unsigned long"       }}uint32_t
{{-     else if eq $.Name "long long"           }}int64_t
{{-     else if eq $.Name "unsigned long long"  }}uint64_t
{{-     else if eq $.Name "object"              }}Object
{{-     else if eq $.Name "DOMString"           }}std::string
{{-     else if eq $.Name "USVString"           }}std::string
{{-     else if eq $.Name "ArrayBuffer"         }}ArrayBuffer
{{-     else if IsInterface (Lookup $.Name)     }}Interface<{{$.Name}}>
{{-     else                                    }}{{$.Name}}
{{-     end                                     }}
{{-   else if IsParametrizedType $}}{{$.Name}}<{{template "TypeList" $.Elems}}>
{{-   else if IsNullableType     $}}std::optional<{{template "Type" $.Type}}>
{{-   else if IsUnionType        $}}std::variant<{{template "VariantTypeList" $.Types}}>
{{-   else if IsSequenceType     $}}std::vector<{{template "Type" $.Elem}}>
{{-   else if IsRecordType       $}}std::unordered_map<{{template "Type" $.Key}}, {{template "Type" $.Elem}}>
{{-   else                        }} /* Unhandled Type {{printf "%T" $}} */
{{-   end -}}
{{- end }}


{{- /*
--------------------------------------------------------------------------------
-- AttributeType generates the C++ type for the given ast.Member
--------------------------------------------------------------------------------
*/ -}}
{{- define "AttributeType" -}}
{{-   if      $.Required }}{{template "AttributeClampHelper" $}}
{{-   else if $.Init     }}{{template "AttributeClampHelper" $}}
{{-   else               }}std::optional<{{template "AttributeClampHelper" $}}>
{{-   end}}
{{- end }}


{{- /*
    A helper for AttributeType that wraps integer types if necessary for WebIDL attributes.
    Note that [Clamp] and [EnforceRange] are supposed to be an annotation on the type and not
    the attribute, but webidlparser doesn't parse this correctly.
*/ -}}
{{- define "AttributeClampHelper" -}}
{{-   if HasAnnotation $ "Clamp" }}
ClampedInteger<{{template "Type" $.Type}}>
{{-   else if HasAnnotation $ "EnforceRange" }}
EnforceRangeInteger<{{template "Type" $.Type}}>
{{-   else}}
{{template "Type" $.Type}}
{{-   end }}
{{- end }}


{{- /*
--------------------------------------------------------------------------------
-- Literal generates a C++ literal value using the following arguments:
--   Value - the ast.Literal
--   Type  - the ast.Type of the literal
--------------------------------------------------------------------------------
*/ -}}
{{- define "Literal" -}}
{{-   if      IsDefaultDictionaryLiteral $.Value}}{{template "Type" $.Type}}{}
{{-   else if IsTypeName                 $.Type }}
{{-     $ty := Lookup $.Type.Name}}
{{-     if      IsTypedef      $ty     }}{{Eval "Literal" "Value" $.Value "Type" $ty.Type}}
{{-     else if IsEnum         $ty     }}{{$.Type.Name}}::{{EnumEntryName $.Value.Value}}
{{-     else if IsBasicLiteral $.Value }}{{$.Value.Value}}
{{-     else                           }}/* Unhandled Type {{printf "ty: %T $.Type.Name: %T $.Value: %T" $ty $.Type.Name $.Value}} */
{{-     end                            }}
{{-   else if IsSequenceType $.Type  }}{{template "Type" $.Type}}{} {{- /* TODO: Assumes the initialiser is empty */}}
{{-   else if IsBasicLiteral $.Value }}{{$.Value.Value}}
{{-   else }} /* Unhandled Type {{printf "%T %T" $.Type $.Value}} */
{{-   end}}
{{- end }}


{{- /*
--------------------------------------------------------------------------------
-- TypeList generates a C++ comma separated list of types from the given
-- []ast.Type
--------------------------------------------------------------------------------
*/ -}}
{{- define "TypeList" -}}
{{-   range $i, $ty := $}}
{{-     if $i }}, {{end}}
{{-     template "Type" $ty}}
{{-   end}}
{{- end }}


{{- /*
--------------------------------------------------------------------------------
-- VariantTypeList generates a C++ comma separated list of types from the given
-- []ast.Type, skipping any 'undefined' types
--------------------------------------------------------------------------------
*/ -}}
{{- define "VariantTypeList" -}}
{{-   range $i, $ty := $}}
{{-     if $i }}, {{end}}
{{-     if IsUndefinedType $ty -}}
          UndefinedType
{{-     else}}
{{-       template "Type" $ty}}
{{-     end}}
{{-   end}}
{{- end }}