tools/bindings/generators/dart_templates/encoding_macros.tmpl

{%- macro encode(variable, kind, offset, bit, level=0, check_for_null=True) %}
{%- if kind|is_pointer_array_kind or kind|is_enum_array_kind %}
{%- set sub_kind = kind.kind %}
{%- set sub_kind_size = "bindings.kPointerSize" %}
{%-   if sub_kind|is_union_kind %}
{%-     set sub_kind_size = "bindings.kUnionSize" %}
{%-   elif sub_kind|is_enum_kind %}
{%-     set sub_kind_size = "bindings.kEnumSize" %}
{%-   endif %}
{%-   if check_for_null -%}
if ({{variable}} == null) {
  encoder{{level}}.encodeNullPointer({{offset}}, {{kind|is_nullable_kind|dart_true_false}});
} else {
{%-   else %}
{
{%-   endif %}
{%-   if sub_kind|is_union_kind %}
  var encoder{{level + 1}} = encoder{{level}}.encodeUnionArray({{variable}}.length, {{offset}}, {{kind|array_expected_length}});
{%-   elif sub_kind|is_enum_kind %}
  var encoder{{level + 1}} = encoder{{level}}.encodeEnumArray({{variable}}.length, {{offset}}, {{kind|array_expected_length}});
{%-   else %}
  var encoder{{level + 1}} = encoder{{level}}.encodePointerArray({{variable}}.length, {{offset}}, {{kind|array_expected_length}});
{%-   endif %}
  for (int i{{level}} = 0; i{{level}} < {{variable}}.length; ++i{{level}}) {
    {{encode(variable~'[i'~level~']', sub_kind, 'bindings.ArrayDataHeader.kHeaderSize + ' ~ sub_kind_size ~ ' * i'~level, 0, level+1)|indent(4)}}
  }
}
{%- elif kind|is_map_kind -%}
if ({{variable}} == null) {
  encoder{{level}}.encodeNullPointer({{offset}}, {{kind|is_nullable_kind|dart_true_false}});
} else {
  var encoder{{level + 1}} = encoder{{level}}.encoderForMap({{offset}});
  var keys{{level}} = {{variable}}.keys.toList();
  var values{{level}} = {{variable}}.values.toList();
  {{encode('keys'~level, kind.key_kind|array, 'bindings.ArrayDataHeader.kHeaderSize', 0, level+1, False)|indent(2)}}
  {{encode('values'~level, kind.value_kind|array, 'bindings.ArrayDataHeader.kHeaderSize + bindings.kPointerSize', 0, level+1, False)|indent(2)}}
}
{%- else -%}
encoder{{level}}.{{kind|encode_method(variable, offset, bit)}};
{%- endif %}
{%- endmacro %}

{%- macro decode(variable, kind, offset, bit, level=0) %}
{%- if kind|is_struct_kind or
       kind|is_pointer_array_kind or
       kind|is_enum_array_kind or
       kind|is_map_kind %}
var decoder{{level+1}} = decoder{{level}}.decodePointer({{offset}}, {{kind|is_nullable_kind|dart_true_false}});
{%-   if kind|is_struct_kind %}
{{variable}} = {{kind|dart_type}}.decode(decoder{{level+1}});
{%-   else %}{# kind|is_pointer_array_kind or is_map_kind #}
{%-     if kind|is_nullable_kind %}
if (decoder{{level+1}} == null) {
  {{variable}} = null;
} else {
{%-     else %}
{
{%-     endif %}
{%-     if kind|is_map_kind %}
  decoder{{level+1}}.decodeDataHeaderForMap();
  List<{{kind.key_kind|dart_type}}> keys{{level}};
  List<{{kind.value_kind|dart_type}}> values{{level}};
  {
    {{decode('keys'~level, kind.key_kind|array, 'bindings.ArrayDataHeader.kHeaderSize', 0, level+1)|indent(4)}}
  }
  {
    {{decode('values'~level, kind.value_kind|array('keys'~level~'.length'), 'bindings.ArrayDataHeader.kHeaderSize + bindings.kPointerSize', 0, level+1)|indent(4)}}
  }
  {{variable}} = new Map<{{kind.key_kind|dart_type}}, {{kind.value_kind|dart_type}}>.fromIterables(
      keys{{level}}, values{{level}});
{%-     else %}
{%-       set sub_kind = kind.kind %}
{%-       if sub_kind|is_union_kind %}
{%-         set sub_kind_size = "bindings.kUnionSize" %}
  var si{{level+1}} = decoder{{level+1}}.decodeDataHeaderForUnionArray({{kind|array_expected_length}});
{%-       elif sub_kind|is_enum_kind %}
{%-         set sub_kind_size = "bindings.kEnumSize" %}
  var si{{level+1}} = decoder{{level+1}}.decodeDataHeaderForEnumArray({{kind|array_expected_length}});
{%-       else %}
{%-         set sub_kind_size = "bindings.kPointerSize" %}
  var si{{level+1}} = decoder{{level+1}}.decodeDataHeaderForPointerArray({{kind|array_expected_length}});
{%-       endif %}
  {{variable}} = new {{kind|dart_type}}(si{{level+1}}.numElements);
  for (int i{{level+1}} = 0; i{{level+1}} < si{{level+1}}.numElements; ++i{{level+1}}) {
    {{decode(variable~'[i'~(level+1)~']', kind.kind, 'bindings.ArrayDataHeader.kHeaderSize + ' ~ sub_kind_size ~ ' * i'~(level+1), 0, level+1)|indent(4)}}
  }
{%-     endif %}
}
{%-   endif %}
{%- elif kind|is_union_kind or kind|is_enum_kind %}
  {{variable}} = {{kind|dart_type}}.decode(decoder{{level}}, {{offset}});
{%-   if not kind|is_nullable_kind %}
  if ({{variable}} == null) {
    throw new bindings.MojoCodecError(
      'Trying to decode null union for non-nullable {{kind|dart_type}}.');
  }
{%    endif %}
{%- else %}
{{variable}} = decoder{{level}}.{{kind|decode_method(offset, bit)}};
{%- endif %}
{%- endmacro %}