public void GenerateCode(JsonRoot root, TextWriter writer)
{
CodeCompileUnit result = new CodeCompileUnit();
result.Namespaces.Add(new CodeNamespace());
GenerateType(result.Namespaces[0], root, new List<string>());
CodeDomProvider provider = CodeDomProvider.CreateProvider(this.language);
CodeGeneratorOptions options = new CodeGeneratorOptions();
options.BracingStyle = "C";
provider.GenerateCodeFromCompileUnit(result, writer, options);
}
private bool CanMergeIntoUserDefinedType(JsonRoot other, out JsonRoot mergedType)
{
bool sameAsThis = true;
mergedType = null;
Dictionary<string, JsonRoot> members = new Dictionary<string, JsonRoot>();
foreach (var memberName in this.Members.Keys.Union(other.Members.Keys))
{
if (this.Members.ContainsKey(memberName) && other.Members.ContainsKey(memberName))
{
JsonRoot member1 = this.Members[memberName];
JsonRoot member2 = other.Members[memberName];
JsonRoot merged;
if (!member1.CanMerge(member2, out merged))
{
return false;
}
else
{
if (merged != member1)
{
sameAsThis = false;
}
members.Add(memberName, merged);
}
}
else if (this.Members.ContainsKey(memberName))
{
members.Add(memberName, this.Members[memberName]);
}
else
{
sameAsThis = false;
members.Add(memberName, other.Members[memberName]);
}
}
if (sameAsThis)
{
mergedType = this;
}
else
{
mergedType = new JsonRoot(this.UserDefinedTypeName, this.ArrayRank, members);
}
return true;
}
private bool CanMergeIntoPrimitiveType(JsonRoot other, out JsonRoot mergedType)
{
if (this.ElementType == other.ElementType)
{
mergedType = this;
return true;
}
bool isThisNullable = this.IsNullableType();
bool isOtherNullable = other.IsNullableType();
Type thisElementType = this.ElementType != null && this.ElementType.IsGenericType && this.ElementType.GetGenericTypeDefinition() == typeof(Nullable<>) ?
this.ElementType.GetGenericArguments()[0] : this.ElementType;
Type otherElementType = other.ElementType != null && other.ElementType.IsGenericType && other.ElementType.GetGenericTypeDefinition() == typeof(Nullable<>) ?
other.ElementType.GetGenericArguments()[0] : other.ElementType;
if (thisElementType == otherElementType)
{
// one nullable, the other not
if (isThisNullable)
{
mergedType = this;
}
else
{
mergedType = other;
}
return true;
}
if (thisElementType == null)
{
if (isOtherNullable || otherElementType == typeof(string))
{
mergedType = other;
return true;
}
mergedType = new JsonRoot(typeof(Nullable<>).MakeGenericType(otherElementType), this.ArrayRank);
return true;
}
if (otherElementType == null)
{
if (isThisNullable || thisElementType == typeof(string))
{
mergedType = this;
return true;
}
mergedType = new JsonRoot(typeof(Nullable<>).MakeGenericType(thisElementType), this.ArrayRank);
return true;
}
// Number coercions
if (this.ElementType == typeof(int))
{
if (other.ElementType == typeof(long) || other.ElementType == typeof(double))
{
mergedType = other;
if (!mergedType.IsNullableType() && isThisNullable)
{
mergedType = new JsonRoot(typeof(Nullable<>).MakeGenericType(mergedType.ElementType), mergedType.ArrayRank);
}
return true;
}
}
else if (this.ElementType == typeof(long))
{
if (other.ElementType == typeof(double))
{
mergedType = other;
if (!mergedType.IsNullableType() && isThisNullable)
{
mergedType = new JsonRoot(typeof(Nullable<>).MakeGenericType(mergedType.ElementType), mergedType.ArrayRank);
}
return true;
}
}
mergedType = null;
return false;
}
private bool CanMergeInto(JsonRoot other, out JsonRoot mergedType)
{
if (this.IsUserDefinedType)
{
return this.CanMergeIntoUserDefinedType(other, out mergedType);
}
else
{
return this.CanMergeIntoPrimitiveType(other, out mergedType);
}
}
private bool CanMerge(JsonRoot other, out JsonRoot mergedType)
{
mergedType = null;
if (this.ArrayRank != other.ArrayRank)
{
return false;
}
if (this.IsUserDefinedType != other.IsUserDefinedType)
{
return false;
}
if (this.CanMergeInto(other, out mergedType))
{
return true;
}
if (other.CanMergeInto(this, out mergedType))
{
return true;
}
return false;
}
private static JsonRoot ParseJObjectIntoDataContract(JObject root, string rootTypeName)
{
Dictionary<string, JsonRoot> fields = new Dictionary<string, JsonRoot>();
foreach (JProperty property in root.Properties())
{
JsonRoot fieldType = ParseJsonIntoDataContract(property.Value, property.Name);
fields.Add(property.Name, fieldType);
}
JsonRoot result = new JsonRoot(rootTypeName, 0, fields);
foreach (var field in fields.Values)
{
field.Parent = result;
}
return result;
}
private string GenerateType(CodeNamespace ns, JsonRoot root, List<string> existingTypes)
{
if (!root.IsUserDefinedType) return null;
CodeTypeDeclaration rootType = new CodeTypeDeclaration(GetUniqueDataContractName(root.UserDefinedTypeName, existingTypes));
existingTypes.Add(rootType.Name);
rootType.Attributes = MemberAttributes.Public;
rootType.IsPartial = true;
rootType.IsClass = true;
ns.Types.Add(rootType);
rootType.Comments.Add(
new CodeCommentStatement(
string.Format(
"Type created for JSON at {0}",
string.Join(" --> ", root.GetAncestors()))));
AddAttributeDeclaration(rootType, rootType.Name, root.UserDefinedTypeName);
AddMembers(ns, rootType, root, existingTypes);
return rootType.Name;
}
private void AddMembers(CodeNamespace ns, CodeTypeDeclaration typeDecl, JsonRoot jsonRoot, List<string> existingTypes)
{
foreach (var memberName in jsonRoot.Members.Keys)
{
string fieldName = EscapeFieldName(memberName);
var member = jsonRoot.Members[memberName];
CodeTypeReference fieldType;
if (member.IsUserDefinedType)
{
string fieldTypeName = this.GenerateType(ns, member, existingTypes);
fieldType = new CodeTypeReference(fieldTypeName);
}
else
{
fieldType = new CodeTypeReference(member.ElementType ?? typeof(object));
}
for (int i = 0; i < member.ArrayRank; i++)
{
fieldType = new CodeTypeReference(fieldType, 1);
}
// TODO: implement members as properties instead of fields
CodeMemberField field = new CodeMemberField(fieldType, fieldName);
field.Attributes = MemberAttributes.Public;
typeDecl.Members.Add(field);
this.AddMemberAttributeDeclaration(field, memberName);
}
}