/
CapacityEstimator.cs
277 lines (221 loc) · 7.96 KB
/
CapacityEstimator.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace Jil.Serialize
{
class CapacityEstimator
{
internal const int ListMultiplier = 10;
internal const int DictionaryMultiplier = 10;
const int StringEstimate = 20;
const int CharacterEstimate = 1;
const int IntEstimate = 3;
const int BoolEstimate = 5;
const int GuidEstimate = 36;
const int DoubleEstimate = 4;
const int ISO8601Estimate = 20;
const int SecondsSinceUnixEpochEstimate = 10;
const int MillisecondsSinceUnixEpochEstimate = 13;
const int NewtonsoftStyleMillisecondsSinceUnixEpochEstimate = 23;
const int RecursiveEstimate = 4;
static int ForPrimitive(Type primType, Options opts)
{
if (primType.IsIntegerNumberType())
{
return IntEstimate;
}
if (primType.IsFloatingPointNumberType())
{
return DoubleEstimate;
}
if (primType == typeof(string))
{
return StringEstimate + 2; // for quotes
}
if (primType == typeof(char))
{
return CharacterEstimate + 2; // for quotes
}
if (primType == typeof(bool))
{
return BoolEstimate;
}
if (primType == typeof(Guid))
{
return GuidEstimate + 2; // for quotes
}
if (primType == typeof(DateTime))
{
switch (opts.UseDateTimeFormat)
{
case DateTimeFormat.ISO8601: return ISO8601Estimate + 2; // for quotes
case DateTimeFormat.SecondsSinceUnixEpoch: return SecondsSinceUnixEpochEstimate;
case DateTimeFormat.MillisecondsSinceUnixEpoch: return MillisecondsSinceUnixEpochEstimate;
case DateTimeFormat.NewtonsoftStyleMillisecondsSinceUnixEpoch: return NewtonsoftStyleMillisecondsSinceUnixEpochEstimate + 2; // for quotes
default: throw new Exception("Unexpected DateTimeFormat: " + opts.UseDateTimeFormat);
}
}
throw new Exception("Unexpected primitive type: " + primType);
}
static int ForEnum(Type enumType, Options opts)
{
var longest = Enum.GetNames(enumType).OrderByDescending(_ => _).First();
var asJson = longest.JsonEscape(opts.IsJSONP);
return asJson.Length + 2; // for quotes
}
static int LineBreakAndIndent(Options opts, int depth)
{
if (opts.ShouldPrettyPrint)
{
return 1 + depth; // line-break & indent
}
return 0;
}
static int ForObject(Type objType, Options opts, int depth, HashSet<Type> seenTypes)
{
if (seenTypes.Contains(objType))
{
return RecursiveEstimate;
}
seenTypes.Add(objType);
var flags = BindingFlags.Public | BindingFlags.Instance;
if (!opts.ShouldIncludeInherited)
{
flags |= BindingFlags.DeclaredOnly;
}
var props = objType.GetProperties(flags).Where(p => p.GetMethod != null);
var fields = objType.GetFields(flags);
var members = props.Cast<MemberInfo>().Concat(fields).ToList();;
var ret = 0;
for (var i = 0; i < members.Count; i++)
{
if (i == 0)
{
ret += 1; // {
ret += LineBreakAndIndent(opts, depth);
}
else
{
ret += 1; // ,
}
var member = members[i];
var memberType = member.ReturnType();
var memberLen = member.Name.JsonEscape(opts.IsJSONP).Length;
memberLen += 2; // quotes
if (opts.ShouldPrettyPrint)
{
memberLen += 2; // colon-space
}
else
{
memberLen += 1; // colon
}
memberLen += For(memberType, opts, depth, seenTypes);
ret += memberLen;
if (i == members.Count - 1)
{
ret += LineBreakAndIndent(opts, depth - 1);
ret += 1; // }
}
else
{
ret += LineBreakAndIndent(opts, depth);
}
}
return ret;
}
static int ForList(Type listType, Options opts, int depth, HashSet<Type> seenTypes)
{
var ret = 0;
ret += 1; // [
var elemType = listType.GetListInterface().GetGenericArguments()[0];
var elemLen = For(elemType, opts, depth, seenTypes);
ret += elemLen * ListMultiplier;
if (opts.ShouldPrettyPrint)
{
ret += (ListMultiplier - 1) * 2; // comma-space
}
else
{
ret += (ListMultiplier - 1); // comma
}
ret += 1; // ]
return ret;
}
static int ForDictionary(Type dictType, Options opts, int depth, HashSet<Type> seenTypes)
{
var ret = 0;
var keyType = dictType.GetDictionaryInterface().GetGenericArguments()[0];
var valType = dictType.GetDictionaryInterface().GetGenericArguments()[1];
var keyLen = For(keyType, opts, depth, seenTypes);
if (keyType != typeof(char) && keyType != typeof(string))
{
keyLen += 2; // quotes
}
var valLen = For(valType, opts, depth, seenTypes);
foreach (var i in Enumerable.Range(0, DictionaryMultiplier))
{
if (i == 0)
{
ret += 1; // {
ret += LineBreakAndIndent(opts, depth);
}
else
{
ret += 1; // ,
}
var memberLen = keyLen;
if (opts.ShouldPrettyPrint)
{
memberLen += 2; // colon-space
}
else
{
memberLen += 1; // colon
}
memberLen += valLen;
ret += memberLen;
if (i == DictionaryMultiplier - 1)
{
ret += LineBreakAndIndent(opts, depth - 1);
ret += 1; // }
}
else
{
ret += LineBreakAndIndent(opts, depth);
}
}
return ret;
}
public static int For(Type forType, Options opts, int depth, HashSet<Type> seenTypes = null)
{
seenTypes = seenTypes ?? new HashSet<Type>();
if (forType.IsNullableType())
{
// Assume the nullable typically has a value
var inner = Nullable.GetUnderlyingType(forType);
return For(inner, opts, depth, seenTypes);
}
if (forType.IsPrimitiveType())
{
return ForPrimitive(forType, opts);
}
if (forType.IsDictionaryType())
{
return ForDictionary(forType, opts, depth + 1, seenTypes);
}
if (forType.IsListType())
{
return ForList(forType, opts, depth, seenTypes);
}
if (forType.IsEnum)
{
return ForEnum(forType, opts);
}
return ForObject(forType, opts, depth + 1, seenTypes);
}
}
}