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Reduce Allocations (#821)

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* Introduce ValueStringBuilder

* Make NumericTokenizer and PlanTextTokenizer thread-safe

* Replace ListPool with ArrayPoolBufferWriter

* Seal ITokenizer classes

* Eliminate array allocation in Type1ArrayTokenizer

* Eliminate array allocation in AcroFormFactory

* Eliminate StringBuilder allocation in Page.GetText

* Optimize PdfSubpath.ToLines

* Eliminate various allocations when parsing CompactFontFormat

* Remove unused FromOctalInt helper

* Ensure Pdf.Content is not null

* Write ASCII values directly to stream (avoiding allocations)

* Avoid encoding additional ASCII values

* Eliminate allocations in TokenWriter.WriteName

* Eliminate allocation in TokenWriter.WriteNumber

* Add System.Memory reference to Fonts
This commit is contained in:
Jason Nelson
2024-04-28 10:55:58 -07:00
committed by GitHub
parent 1ef2e127a6
commit 7f42a8d60c
32 changed files with 516 additions and 471 deletions
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209
src/UglyToad.PdfPig.Tokenization/NumericTokenizer.cs
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@@ -6,10 +6,8 @@
using Core;
using Tokens;
internal class NumericTokenizer : ITokenizer
internal sealed class NumericTokenizer : ITokenizer
{
private readonly StringBuilder stringBuilder = new StringBuilder();
private const byte Zero = 48;
private const byte Nine = 57;
@@ -19,17 +17,16 @@
{
token = null;
StringBuilder characters;
var initialSymbol = currentByte == '-' || currentByte == '+';
using var characters = new ValueStringBuilder(stackalloc char[32]);
var initialSymbol = currentByte is (byte)'-' or (byte)'+';
if ((currentByte >= Zero && currentByte <= Nine) || currentByte == '.')
{
characters = stringBuilder;
characters.Append((char)currentByte);
}
else if (initialSymbol)
{
characters = stringBuilder;
characters.Append((char) currentByte);
}
else
@@ -67,115 +64,103 @@
}
}
try
var str = characters.ToString();
switch (str)
{
var str = characters.ToString();
characters.Clear();
switch (str)
{
case "-1":
token = NumericToken.MinusOne;
return true;
case "-":
case ".":
case "0":
case "0000":
token = NumericToken.Zero;
return true;
case "1":
token = NumericToken.One;
return true;
case "2":
token = NumericToken.Two;
return true;
case "3":
token = NumericToken.Three;
return true;
case "4":
token = NumericToken.Four;
return true;
case "5":
token = NumericToken.Five;
return true;
case "6":
token = NumericToken.Six;
return true;
case "7":
token = NumericToken.Seven;
return true;
case "8":
token = NumericToken.Eight;
return true;
case "9":
token = NumericToken.Nine;
return true;
case "10":
token = NumericToken.Ten;
return true;
case "11":
token = NumericToken.Eleven;
return true;
case "12":
token = NumericToken.Twelve;
return true;
case "13":
token = NumericToken.Thirteen;
return true;
case "14":
token = NumericToken.Fourteen;
return true;
case "15":
token = NumericToken.Fifteen;
return true;
case "16":
token = NumericToken.Sixteen;
return true;
case "17":
token = NumericToken.Seventeen;
return true;
case "18":
token = NumericToken.Eighteen;
return true;
case "19":
token = NumericToken.Nineteen;
return true;
case "20":
token = NumericToken.Twenty;
return true;
case "100":
token = NumericToken.OneHundred;
return true;
case "500":
token = NumericToken.FiveHundred;
return true;
case "1000":
token = NumericToken.OneThousand;
return true;
default:
if (!double.TryParse(str, NumberStyles.Any, CultureInfo.InvariantCulture, out var value))
case "-1":
token = NumericToken.MinusOne;
return true;
case "-":
case ".":
case "0":
case "0000":
token = NumericToken.Zero;
return true;
case "1":
token = NumericToken.One;
return true;
case "2":
token = NumericToken.Two;
return true;
case "3":
token = NumericToken.Three;
return true;
case "4":
token = NumericToken.Four;
return true;
case "5":
token = NumericToken.Five;
return true;
case "6":
token = NumericToken.Six;
return true;
case "7":
token = NumericToken.Seven;
return true;
case "8":
token = NumericToken.Eight;
return true;
case "9":
token = NumericToken.Nine;
return true;
case "10":
token = NumericToken.Ten;
return true;
case "11":
token = NumericToken.Eleven;
return true;
case "12":
token = NumericToken.Twelve;
return true;
case "13":
token = NumericToken.Thirteen;
return true;
case "14":
token = NumericToken.Fourteen;
return true;
case "15":
token = NumericToken.Fifteen;
return true;
case "16":
token = NumericToken.Sixteen;
return true;
case "17":
token = NumericToken.Seventeen;
return true;
case "18":
token = NumericToken.Eighteen;
return true;
case "19":
token = NumericToken.Nineteen;
return true;
case "20":
token = NumericToken.Twenty;
return true;
case "100":
token = NumericToken.OneHundred;
return true;
case "500":
token = NumericToken.FiveHundred;
return true;
case "1000":
token = NumericToken.OneThousand;
return true;
default:
if (!double.TryParse(str, NumberStyles.Any, CultureInfo.InvariantCulture, out var value))
{
if (TryParseInvalidNumber(str, out value))
{
if (TryParseInvalidNumber(str, out value))
{
token = new NumericToken(value);
return true;
}
return false;
token = new NumericToken(value);
return true;
}
token = new NumericToken(value);
return true;
}
}
catch (FormatException)
{
return false;
}
catch (OverflowException)
{
return false;
}
return false;
}
token = new NumericToken(value);
return true;
}
}
private static bool TryParseInvalidNumber(string numeric, out double result)