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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// Synopsis: Implements class Parsers for internal use of type converters
//
// This file contains all the code that is shared between PresentationBuildTasks and PresentationCore
// Changes to this file will likely result in a compiler update.
using System;
using System.IO;
#if PRESENTATION_CORE
using System.Windows.Media;
using System.Windows.Media.Media3D;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows;
using MS.Internal.Media;
using TypeConverterHelper = System.Windows.Markup.TypeConverterHelper;
namespace MS.Internal
#elif PBTCOMPILER
using MS.Utility;
using MS.Internal.Markup;
using TypeConverterHelper = MS.Internal.Markup.TypeConverterHelper;
namespace MS.Internal.Markup
#endif
{
internal static partial class Parsers
{
#if !PBTCOMPILER
internal static object DeserializeStreamGeometry( BinaryReader reader )
{
StreamGeometry geometry = new StreamGeometry();
using (StreamGeometryContext context = geometry.Open())
{
ParserStreamGeometryContext.Deserialize( reader, context, geometry );
}
geometry.Freeze();
return geometry;
}
#endif
internal static void PathMinilanguageToBinary( BinaryWriter bw, string stringValue )
{
ParserStreamGeometryContext context = new ParserStreamGeometryContext( bw );
#if PRESENTATION_CORE
FillRule fillRule = FillRule.EvenOdd ;
#else
bool fillRule = false ;
#endif
ParseStringToStreamGeometryContext(context, stringValue, TypeConverterHelper.InvariantEnglishUS, ref fillRule);
context.SetFillRule( fillRule );
context.MarkEOF();
}
/// <summary>
/// Parse a PathGeometry string.
/// The PathGeometry syntax is the same as the PathFigureCollection syntax except that it
/// may start with a "wsp*Fwsp*(0|1)" which indicate the winding mode (F0 is EvenOdd while
/// F1 is NonZero).
/// </summary>
#if !PBTCOMPILER
internal static Geometry ParseGeometry(
string pathString,
IFormatProvider formatProvider)
{
FillRule fillRule = FillRule.EvenOdd ;
StreamGeometry geometry = new StreamGeometry();
StreamGeometryContext context = geometry.Open();
ParseStringToStreamGeometryContext( context, pathString, formatProvider , ref fillRule ) ;
geometry.FillRule = fillRule ;
geometry.Freeze();
return geometry;
}
#endif
//
// Given a mini-language representation of a Geometry - write it to the
// supplied streamgeometrycontext
//
private static void ParseStringToStreamGeometryContext (
StreamGeometryContext context,
string pathString,
IFormatProvider formatProvider,
#if PRESENTATION_CORE
ref FillRule fillRule
#else
ref bool fillRule
#endif
)
{
using ( context )
{
// Check to ensure that there's something to parse
if (pathString != null)
{
int curIndex = 0;
// skip any leading space
while ((curIndex < pathString.Length) && Char.IsWhiteSpace(pathString, curIndex))
{
curIndex++;
}
// Is there anything to look at?
if (curIndex < pathString.Length)
{
// If so, we only care if the first non-WhiteSpace char encountered is 'F'
if (pathString[curIndex] == 'F')
{
curIndex++;
// Since we found 'F' the next non-WhiteSpace char must be 0 or 1 - look for it.
while ((curIndex < pathString.Length) && Char.IsWhiteSpace(pathString, curIndex))
{
curIndex++;
}
// If we ran out of text, this is an error, because 'F' cannot be specified without 0 or 1
// Also, if the next token isn't 0 or 1, this too is illegal
if ((curIndex == pathString.Length) ||
((pathString[curIndex] != '0') &&
(pathString[curIndex] != '1')))
{
throw new FormatException(SR.Parsers_IllegalToken);
}
#if PRESENTATION_CORE
fillRule = pathString[curIndex] == '0' ? FillRule.EvenOdd : FillRule.Nonzero;
#else
fillRule = pathString[curIndex] != '0' ;
#endif
// Increment curIndex to point to the next char
curIndex++;
}
}
AbbreviatedGeometryParser parser = new AbbreviatedGeometryParser();
parser.ParseToGeometryContext(context, pathString, curIndex);
}
}
}
}
/// <summary>
/// Parser for XAML abbreviated geometry.
/// SVG path spec is closely followed http://www.w3.org/TR/SVG11/paths.html
/// 3/23/2006, new parser for performance (fyuan)
/// </summary>
sealed internal class AbbreviatedGeometryParser
{
const bool AllowSign = true;
const bool AllowComma = true;
const bool IsFilled = true;
const bool IsClosed = true;
const bool IsStroked = true;
const bool IsSmoothJoin = true;
IFormatProvider _formatProvider;
string _pathString; // Input string to be parsed
int _pathLength;
int _curIndex; // Location to read next character from
bool _figureStarted; // StartFigure is effective
Point _lastStart; // Last figure starting point
Point _lastPoint; // Last point
Point _secondLastPoint; // The point before last point
char _token; // Non whitespace character returned by ReadToken
StreamGeometryContext _context;
/// <summary>
/// Throw unexpected token exception
/// </summary>
private void ThrowBadToken()
{
throw new System.FormatException(SR.Format(SR.Parser_UnexpectedToken, _pathString, _curIndex - 1));
}
bool More()
{
return _curIndex < _pathLength;
}
// Skip white space, one comma if allowed
private bool SkipWhiteSpace(bool allowComma)
{
bool commaMet = false;
while (More())
{
char ch = _pathString[_curIndex];
switch (ch)
{
case ' ' :
case '\n':
case '\r':
case '\t': // SVG whitespace
break;
case ',':
if (allowComma)
{
commaMet = true;
allowComma = false; // one comma only
}
else
{
ThrowBadToken();
}
break;
default:
// Avoid calling IsWhiteSpace for ch in (' ' .. 'z']
if (((ch >' ') && (ch <= 'z')) || ! Char.IsWhiteSpace(ch))
{
return commaMet;
}
break;
}
_curIndex ++;
}
return commaMet;
}
/// <summary>
/// Read the next non whitespace character
/// </summary>
/// <returns>True if not end of string</returns>
private bool ReadToken()
{
SkipWhiteSpace(!AllowComma);
// Check for end of string
if (More())
{
_token = _pathString[_curIndex ++];
return true;
}
else
{
return false;
}
}
private bool IsNumber(bool allowComma)
{
bool commaMet = SkipWhiteSpace(allowComma);
if (More())
{
_token = _pathString[_curIndex];
// Valid start of a number
if ((_token == '.') || (_token == '-') || (_token == '+') || ((_token >= '0') && (_token <= '9'))
|| (_token == 'I') // Infinity
|| (_token == 'N')) // NaN
{
return true;
}
}
if (commaMet) // Only allowed between numbers
{
ThrowBadToken();
}
return false;
}
void SkipDigits(bool signAllowed)
{
// Allow for a sign
if (signAllowed && More() && ((_pathString[_curIndex] == '-') || _pathString[_curIndex] == '+'))
{
_curIndex++;
}
while (More() && (_pathString[_curIndex] >= '0') && (_pathString[_curIndex] <= '9'))
{
_curIndex ++;
}
}
//
// /// <summary>
// /// See if the current token matches the string s. If so, advance and
// /// return true. Else, return false.
// /// </summary>
// bool TryAdvance(string s)
// {
// Debug.Assert(s.Length != 0);
//
// bool match = false;
// if (More() && _pathString[_currentIndex] == s[0])
// {
// //
// // Don't bother reading subsequent characters, as the CLR parser will
// // do this for us later.
// //
// _currentIndex = Math.Min(_currentIndex + s.Length, _pathLength);
//
// match = true;
// }
//
// return match;
// }
//
/// <summary>
/// Read a floating point number
/// </summary>
/// <returns></returns>
double ReadNumber(bool allowComma)
{
if (!IsNumber(allowComma))
{
ThrowBadToken();
}
bool simple = true;
int start = _curIndex;
//
// Allow for a sign
//
// There are numbers that cannot be preceded with a sign, for instance, -NaN, but it's
// fine to ignore that at this point, since the CLR parser will catch this later.
//
if (More() && ((_pathString[_curIndex] == '-') || _pathString[_curIndex] == '+'))
{
_curIndex ++;
}
// Check for Infinity (or -Infinity).
if (More() && (_pathString[_curIndex] == 'I'))
{
//
// Don't bother reading the characters, as the CLR parser will
// do this for us later.
//
_curIndex = Math.Min(_curIndex+8, _pathLength); // "Infinity" has 8 characters
simple = false;
}
// Check for NaN
else if (More() && (_pathString[_curIndex] == 'N'))
{
//
// Don't bother reading the characters, as the CLR parser will
// do this for us later.
//
_curIndex = Math.Min(_curIndex+3, _pathLength); // "NaN" has 3 characters
simple = false;
}
else
{
SkipDigits(! AllowSign);
// Optional period, followed by more digits
if (More() && (_pathString[_curIndex] == '.'))
{
simple = false;
_curIndex ++;
SkipDigits(! AllowSign);
}
// Exponent
if (More() && ((_pathString[_curIndex] == 'E') || (_pathString[_curIndex] == 'e')))
{
simple = false;
_curIndex ++;
SkipDigits(AllowSign);
}
}
if (simple && (_curIndex <= (start + 8))) // 32-bit integer
{
int sign = 1;
if (_pathString[start] == '+')
{
start ++;
}
else if (_pathString[start] == '-')
{
start ++;
sign = -1;
}
int value = 0;
while (start < _curIndex)
{
value = value * 10 + (_pathString[start] - '0');
start ++;
}
return value * sign;
}
else
{
try
{
#if NET
return double.Parse(_pathString.AsSpan(start, _curIndex - start), provider: _formatProvider);
#else
return double.Parse(_pathString.Substring(start, _curIndex - start), provider: _formatProvider);
#endif
}
catch (FormatException except)
{
throw new System.FormatException(SR.Format(SR.Parser_UnexpectedToken, _pathString, start), except);
}
}
}
/// <summary>
/// Read a bool: 1 or 0
/// </summary>
/// <returns></returns>
bool ReadBool()
{
SkipWhiteSpace(AllowComma);
if (More())
{
_token = _pathString[_curIndex ++];
if (_token == '0')
{
return false;
}
else if (_token == '1')
{
return true;
}
}
ThrowBadToken();
return false;
}
/// <summary>
/// Read a relative point
/// </summary>
/// <returns></returns>
private Point ReadPoint(char cmd, bool allowcomma)
{
double x = ReadNumber(allowcomma);
double y = ReadNumber(AllowComma);
if (cmd >= 'a') // 'A' < 'a'. lower case for relative
{
x += _lastPoint.X;
y += _lastPoint.Y;
}
return new Point(x, y);
}
/// <summary>
/// Reflect _secondLastPoint over _lastPoint to get a new point for smooth curve
/// </summary>
/// <returns></returns>
private Point Reflect()
{
return new Point(2 * _lastPoint.X - _secondLastPoint.X,
2 * _lastPoint.Y - _secondLastPoint.Y);
}
private void EnsureFigure()
{
if (!_figureStarted)
{
_context.BeginFigure(_lastStart, IsFilled, ! IsClosed);
_figureStarted = true;
}
}
/// <summary>
/// Parse a PathFigureCollection string
/// </summary>
internal void ParseToGeometryContext(
StreamGeometryContext context,
string pathString,
int startIndex)
{
// We really should throw an ArgumentNullException here for context and pathString.
// From original code
// This is only used in call to Double.Parse
_formatProvider = System.Globalization.CultureInfo.InvariantCulture;
_context = context;
_pathString = pathString;
_pathLength = pathString.Length;
_curIndex = startIndex;
_secondLastPoint = new Point(0, 0);
_lastPoint = new Point(0, 0);
_lastStart = new Point(0, 0);
_figureStarted = false;
bool first = true;
char last_cmd = ' ';
while (ReadToken()) // Empty path is allowed in XAML
{
char cmd = _token;
if (first)
{
if ((cmd != 'M') && (cmd != 'm')) // Path starts with M|m
{
ThrowBadToken();
}
first = false;
}
switch (cmd)
{
case 'm': case 'M':
// XAML allows multiple points after M/m
_lastPoint = ReadPoint(cmd, ! AllowComma);
context.BeginFigure(_lastPoint, IsFilled, ! IsClosed);
_figureStarted = true;
_lastStart = _lastPoint;
last_cmd = 'M';
while (IsNumber(AllowComma))
{
_lastPoint = ReadPoint(cmd, ! AllowComma);
context.LineTo(_lastPoint, IsStroked, ! IsSmoothJoin);
last_cmd = 'L';
}
break;
case 'l': case 'L':
case 'h': case 'H':
case 'v': case 'V':
EnsureFigure();
do
{
switch (cmd)
{
case 'l': _lastPoint = ReadPoint(cmd, ! AllowComma); break;
case 'L': _lastPoint = ReadPoint(cmd, ! AllowComma); break;
case 'h': _lastPoint.X += ReadNumber(! AllowComma); break;
case 'H': _lastPoint.X = ReadNumber(! AllowComma); break;
case 'v': _lastPoint.Y += ReadNumber(! AllowComma); break;
case 'V': _lastPoint.Y = ReadNumber(! AllowComma); break;
}
context.LineTo(_lastPoint, IsStroked, ! IsSmoothJoin);
}
while (IsNumber(AllowComma));
last_cmd = 'L';
break;
case 'c': case 'C': // cubic Bezier
case 's': case 'S': // smooth cublic Bezier
EnsureFigure();
do
{
Point p;
if ((cmd == 's') || (cmd == 'S'))
{
if (last_cmd == 'C')
{
p = Reflect();
}
else
{
p = _lastPoint;
}
_secondLastPoint = ReadPoint(cmd, ! AllowComma);
}
else
{
p = ReadPoint(cmd, ! AllowComma);
_secondLastPoint = ReadPoint(cmd, AllowComma);
}
_lastPoint = ReadPoint(cmd, AllowComma);
context.BezierTo(p, _secondLastPoint, _lastPoint, IsStroked, ! IsSmoothJoin);
last_cmd = 'C';
}
while (IsNumber(AllowComma));
break;
case 'q': case 'Q': // quadratic Bezier
case 't': case 'T': // smooth quadratic Bezier
EnsureFigure();
do
{
if ((cmd == 't') || (cmd == 'T'))
{
if (last_cmd == 'Q')
{
_secondLastPoint = Reflect();
}
else
{
_secondLastPoint = _lastPoint;
}
_lastPoint = ReadPoint(cmd, ! AllowComma);
}
else
{
_secondLastPoint = ReadPoint(cmd, ! AllowComma);
_lastPoint = ReadPoint(cmd, AllowComma);
}
context.QuadraticBezierTo(_secondLastPoint, _lastPoint, IsStroked, ! IsSmoothJoin);
last_cmd = 'Q';
}
while (IsNumber(AllowComma));
break;
case 'a': case 'A':
EnsureFigure();
do
{
// A 3,4 5, 0, 0, 6,7
double w = ReadNumber(! AllowComma);
double h = ReadNumber(AllowComma);
double rotation = ReadNumber(AllowComma);
bool large = ReadBool();
bool sweep = ReadBool();
_lastPoint = ReadPoint(cmd, AllowComma);
context.ArcTo(
_lastPoint,
new Size(w, h),
rotation,
large,
#if PBTCOMPILER
sweep,
#else
sweep ? SweepDirection.Clockwise : SweepDirection.Counterclockwise,
#endif
IsStroked,
! IsSmoothJoin
);
}
while (IsNumber(AllowComma));
last_cmd = 'A';
break;
case 'z':
case 'Z':
EnsureFigure();
context.SetClosedState(IsClosed);
_figureStarted = false;
last_cmd = 'Z';
_lastPoint = _lastStart; // Set reference point to be first point of current figure
break;
default:
ThrowBadToken();
break;
}
}
}
}
}
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