mojo/public/tools/bindings/generators/go_templates/struct.tmpl

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

{% import "encoding_macros.tmpl" as encoding_macros %}

{% macro define(struct, exported=True) %}
type {{struct|name(exported)}} struct {
{% for field in struct.fields %}
	{{field|name(exported)}} {{field.kind|go_type}}
{% endfor %}
}

func (s *{{struct|name(exported)}}) Encode(encoder *bindings.Encoder) error {
{% set HEADER_SIZE = 8 %}
	encoder.StartStruct({{struct.versions[-1].num_bytes - HEADER_SIZE}}, {{struct.versions[-1].version}})
{% for byte in struct.bytes %}
{%   for packed_field in byte.packed_fields %}
	{{encoding_macros.encode('s.'~packed_field.field|name(exported), packed_field.field.kind)|tab_indent()}}
{%   endfor %}
{% endfor %}
	if err := encoder.Finish(); err != nil {
		return err
	}
	return nil
}

var {{struct|name(False)}}_Versions []bindings.DataHeader = []bindings.DataHeader{
{% for versionInfo in struct.versions %}
	bindings.DataHeader{{'{'}}{{versionInfo.num_bytes}}, {{versionInfo.version}}{{'}'}},
{% endfor %}
}

func (s *{{struct|name(exported)}}) Decode(decoder *bindings.Decoder) error {
	header, err := decoder.StartStruct()
	if err != nil {
		return err
	}
	index := sort.Search(len({{struct|name(False)}}_Versions), func(i int) bool {
		return {{struct|name(False)}}_Versions[i].ElementsOrVersion >= header.ElementsOrVersion
	})
	if index < len({{struct|name(False)}}_Versions) {
		if {{struct|name(False)}}_Versions[index].ElementsOrVersion > header.ElementsOrVersion {
			index--
		}
		expectedSize := {{struct|name(False)}}_Versions[index].Size
		if expectedSize != header.Size {
			return &bindings.ValidationError{bindings.UnexpectedStructHeader,
				fmt.Sprintf("invalid struct header size: should be %d, but was %d", expectedSize, header.Size),
			}
		}
	}
{% for byte in struct.bytes %}
{%   for packed_field in byte.packed_fields %}
	if header.ElementsOrVersion >= {{packed_field.min_version}} {
		{{encoding_macros.decode('s.'~packed_field.field|name(exported), packed_field.field.kind)|tab_indent(2)}}
	}
{%   endfor %}
{% endfor %}
	if err := decoder.Finish(); err != nil {
		return err
	}
	return nil
}

{% endmacro %}