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using System;
using Google.ProtocolBuffers.Descriptors;
using System.Globalization;
namespace Google.ProtocolBuffers.ProtoGen {
internal abstract class FieldGeneratorBase : SourceGeneratorBase<FieldDescriptor> {
protected FieldGeneratorBase(FieldDescriptor descriptor)
: base(descriptor) {
}
private static bool AllPrintableAscii(string text) {
foreach (char c in text) {
if (c < 0x20 || c > 0x7e) {
return false;
}
}
return true;
}
protected string DefaultValue {
get {
string suffix = "";
switch (Descriptor.FieldType) {
case FieldType.Float: suffix = "F"; break;
case FieldType.Double: suffix = "D"; break;
case FieldType.Int64: suffix = "L"; break;
case FieldType.UInt64: suffix = "UL"; break;
}
switch (Descriptor.FieldType) {
case FieldType.Float:
case FieldType.Double:
case FieldType.Int32:
case FieldType.Int64:
case FieldType.SInt32:
case FieldType.SInt64:
case FieldType.SFixed32:
case FieldType.SFixed64:
case FieldType.UInt32:
case FieldType.UInt64:
case FieldType.Fixed32:
case FieldType.Fixed64:
// The simple Object.ToString converts using the current culture.
// We want to always use the invariant culture so it's predictable.
IConvertible value = (IConvertible) Descriptor.DefaultValue;
return value.ToString(CultureInfo.InvariantCulture) + suffix;
case FieldType.Bool:
return (bool) Descriptor.DefaultValue ? "true" : "false";
case FieldType.Bytes:
if (!Descriptor.HasDefaultValue) {
return "pb::ByteString.Empty";
}
return string.Format("(pb::ByteString) {0}.Descriptor.Fields[{1}].DefaultValue", TypeName, Number);
case FieldType.String:
if (AllPrintableAscii(Descriptor.Proto.DefaultValue)) {
// All chars are ASCII and printable. In this case we only
// need to escape quotes and backslashes.
return "\"" + Descriptor.Proto.DefaultValue
.Replace("\\", "\\\\")
.Replace("'", "\\'")
.Replace("\"", "\\\"")
+ "\"";
}
return string.Format("(string) {0}.Descriptor.Fields[{1}].DefaultValue", TypeName, Number);
case FieldType.Enum:
return TypeName + "." + ((EnumValueDescriptor) Descriptor.DefaultValue).Name;
case FieldType.Message:
case FieldType.Group:
return TypeName + ".DefaultInstance";
default:
throw new InvalidOperationException("Invalid field descriptor type");
}
}
}
/// <summary>
/// Usually the same as CapitalizedName, except when the enclosing type has the same name,
/// in which case an underscore is appended.
/// </summary>
protected string PropertyName {
get {
string ret = CapitalizedName;
if (ret == Descriptor.ContainingType.Name) {
ret += "_";
}
return ret;
}
}
protected string CapitalizedName {
get { return Helpers.UnderscoresToPascalCase(DescriptorUtil.GetFieldName(Descriptor)); }
}
protected string Name {
get { return Helpers.UnderscoresToCamelCase(DescriptorUtil.GetFieldName(Descriptor)); }
}
protected int Number {
get { return Descriptor.FieldNumber; }
}
protected string TypeName {
get {
switch (Descriptor.FieldType) {
case FieldType.Enum:
return DescriptorUtil.GetClassName(Descriptor.EnumType);
case FieldType.Message:
case FieldType.Group:
return DescriptorUtil.GetClassName(Descriptor.MessageType);
default:
return DescriptorUtil.GetMappedTypeName(Descriptor.MappedType);
}
}
}
protected string MessageOrGroup {
get { return Descriptor.FieldType == FieldType.Group ? "Group" : "Message"; }
}
/// <summary>
/// Returns the type name as used in CodedInputStream method names: SFixed32, UInt32 etc.
/// </summary>
protected string CapitalizedTypeName {
get {
// Our enum names match perfectly. How serendipitous.
return Descriptor.FieldType.ToString();
}
}
}
}
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