VAR/VAR.PdfTools
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PdfTextExtractor: Rework text position calculations.

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This commit is contained in:
Valeriano A.R.
2017-06-26 01:45:34 +02:00
parent ae76cab45d
commit d4c4615684
2 changed files with 100 additions and 106 deletions
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18
VAR.PdfTools/PdfElements.cs
View File

@@ -182,6 +182,7 @@ namespace VAR.PdfTools
}
return defaultValue;
}
public static long GetInt(IPdfElement elem, long defaultValue)
{
if (elem == null)
@@ -198,5 +199,22 @@ namespace VAR.PdfTools
}
return defaultValue;
}
public static string GetString(IPdfElement elem, string defaultValue)
{
if (elem == null)
{
return defaultValue;
}
if (elem is PdfString)
{
return ((PdfString)elem).Value;
}
if (elem is PdfName)
{
return ((PdfName)elem).Value;
}
return defaultValue;
}
}
}

188
VAR.PdfTools/PdfTextExtractor.cs
View File

@@ -25,7 +25,7 @@ namespace VAR.PdfTools
{
Init();
}
public void Init()
{
_vector[0] = 0.0;
@@ -35,7 +35,7 @@ namespace VAR.PdfTools
#endregion
}
public class Matrix3x3
{
#region Declarations
@@ -116,7 +116,7 @@ namespace VAR.PdfTools
newMatrix._matrix[2, 0] = (_matrix[0, 0] * matrix._matrix[2, 0]) + (_matrix[1, 0] * matrix._matrix[2, 1]) + (_matrix[2, 0] * matrix._matrix[2, 2]);
newMatrix._matrix[2, 1] = (_matrix[0, 1] * matrix._matrix[2, 0]) + (_matrix[1, 1] * matrix._matrix[2, 1]) + (_matrix[2, 1] * matrix._matrix[2, 2]);
newMatrix._matrix[2, 2] = (_matrix[0, 2] * matrix._matrix[2, 0]) + (_matrix[1, 2] * matrix._matrix[2, 1]) + (_matrix[2, 2] * matrix._matrix[2, 2]);
return newMatrix;
}
@@ -153,6 +153,12 @@ namespace VAR.PdfTools
#endregion
}
public struct PdfCharElement
{
public string Char;
public double Displacement;
}
public class PdfTextElement
{
#region Properties
@@ -171,6 +177,8 @@ namespace VAR.PdfTools
public double VisibleHeight { get; set; }
public List<PdfCharElement> Characters { get; set; }
private List<PdfTextElement> _childs = new List<PdfTextElement>();
public List<PdfTextElement> Childs { get { return _childs; } }
@@ -206,15 +214,17 @@ namespace VAR.PdfTools
// Text state
private PdfFont _font = null;
private double _fontSize = 1;
private double _charSpacing = 0;
private double _wordSpacing = 0;
private double _textLeading = 0;
// Text object state
private bool inText = false;
private Matrix3x3 _textMatrix = new Matrix3x3();
private Matrix3x3 _textMatrixCurrent = new Matrix3x3();
private StringBuilder _sbText = new StringBuilder();
private double _textWidth = 0;
PdfTextElement _currentTextElement = null;
private List<PdfCharElement> _listCharacters = new List<PdfCharElement>();
#endregion
@@ -258,42 +268,23 @@ namespace VAR.PdfTools
PdfTextElement textElem = new PdfTextElement();
textElem.Font = _font;
textElem.FontSize = _fontSize;
textElem.Matrix = _textMatrix.Multiply(_graphicsMatrix);
textElem.Matrix = _textMatrixCurrent.Multiply(_graphicsMatrix);
textElem.RawText = _sbText.ToString();
textElem.VisibleText = PdfString_ToUnicode(textElem.RawText, _font);
textElem.VisibleWidth = _textWidth * textElem.Matrix.Matrix[0, 0];
textElem.VisibleHeight = (_font.Height * _fontSize) * textElem.Matrix.Matrix[1, 1];
textElem.Characters = new List<PdfCharElement>();
foreach (PdfCharElement c in _listCharacters)
{
textElem.Characters.Add(new PdfCharElement
{
Char = c.Char,
Displacement = (c.Displacement * textElem.Matrix.Matrix[0, 0]),
});
}
return textElem;
}
private void FlushTextElementSoft()
{
if (_sbText.Length == 0)
{
return;
}
PdfTextElement textElem = BuildTextElement();
if (_currentTextElement == null)
{
_currentTextElement = new PdfTextElement();
_currentTextElement.Font = null;
_currentTextElement.FontSize = -1;
_currentTextElement.Matrix = textElem.Matrix.Copy();
_currentTextElement.RawText = string.Empty;
_currentTextElement.VisibleText = string.Empty;
_currentTextElement.VisibleWidth = 0;
_currentTextElement.VisibleHeight = 0;
}
_currentTextElement.VisibleText += textElem.VisibleText;
_currentTextElement.VisibleWidth += textElem.VisibleWidth;
_currentTextElement.VisibleHeight = System.Math.Max(_currentTextElement.VisibleHeight, textElem.VisibleHeight);
_currentTextElement.Childs.Add(textElem);
_sbText = new StringBuilder();
_textWidth = 0;
}
private void AddTextElement(PdfTextElement textElement)
{
if (string.IsNullOrEmpty(textElement.VisibleText.Trim()))
@@ -307,27 +298,16 @@ namespace VAR.PdfTools
{
if (_sbText.Length == 0)
{
if (_currentTextElement != null)
{
AddTextElement(_currentTextElement);
_currentTextElement = null;
}
_textWidth = 0;
return;
}
PdfTextElement textElem = BuildTextElement();
AddTextElement(textElem);
if (_currentTextElement != null)
{
FlushTextElementSoft();
AddTextElement(_currentTextElement);
_currentTextElement = null;
}
else
{
PdfTextElement textElem = BuildTextElement();
AddTextElement(textElem);
}
_textMatrixCurrent.Matrix[0, 2] += _textWidth;
_sbText = new StringBuilder();
_listCharacters.Clear();
_textWidth = 0;
}
@@ -336,9 +316,9 @@ namespace VAR.PdfTools
StringBuilder sbResult = new StringBuilder();
foreach (char c in text)
{
if (c == '.' || c == ',' ||
c == ':' || c == ';' ||
c == '-' || c == '_' ||
if (c == '.' || c == ',' ||
c == ':' || c == ';' ||
c == '-' || c == '_' ||
c == ' ' || c == '\t')
{
continue;
@@ -406,36 +386,49 @@ namespace VAR.PdfTools
_graphicsMatrixStack.Add(_graphicsMatrix.Copy());
}
private void OpSetGraphMatrix(double a, double b, double c, double d, double e, double f)
{
_graphicsMatrix.Set(a, b, c, d, e, f);
}
private void OpPopGraphState()
{
_graphicsMatrix = _graphicsMatrixStack[_graphicsMatrixStack.Count - 1];
_graphicsMatrixStack.RemoveAt(_graphicsMatrixStack.Count - 1);
}
private void OpSetGraphMatrix(double a, double b, double c, double d, double e, double f)
{
_graphicsMatrix.Set(a, b, c, d, e, f);
}
private void OpBeginText()
{
_textMatrix.Idenity();
_textMatrixCurrent.Idenity();
inText = true;
}
private void OpEndText()
{
FlushTextElementSoft();
FlushTextElement();
inText = false;
}
private void OpTextFont(string fontName, double size)
{
FlushTextElementSoft();
FlushTextElement();
_font = _page.Fonts[fontName];
_fontSize = size;
}
private void OpTextCharSpacing(double charSpacing)
{
_charSpacing = charSpacing;
}
private void OpTextWordSpacing(double wordSpacing)
{
_wordSpacing = wordSpacing;
}
private void OpTextLeading(double textLeading)
{
_textLeading = textLeading;
@@ -448,6 +441,7 @@ namespace VAR.PdfTools
newMatrix.Matrix[0, 2] = x;
newMatrix.Matrix[1, 2] = y;
_textMatrix = newMatrix.Multiply(_textMatrix);
_textMatrixCurrent = _textMatrix.Copy();
}
private void OpTextLineFeed()
@@ -457,37 +451,12 @@ namespace VAR.PdfTools
private void OpSetTextMatrix(double a, double b, double c, double d, double e, double f)
{
double halfSpaceWidth = 0;
double horizontalDelta = 0;
Matrix3x3 newMatrix = new Matrix3x3(a, b, c, d, e, f);
if (_font != null)
{
halfSpaceWidth = _font.GetCharWidth(' ') * _fontSize;
}
horizontalDelta = (_textWidth + halfSpaceWidth);
if (_textMatrix.IsCollinear(newMatrix, horizontalDelta: horizontalDelta))
{
return;
}
if (_currentTextElement != null)
{
if (_currentTextElement.Font != null)
{
halfSpaceWidth = _currentTextElement.Font.GetCharWidth(' ') * _currentTextElement.FontSize;
}
horizontalDelta = (_currentTextElement.VisibleWidth + halfSpaceWidth);
if (_currentTextElement.Matrix.IsCollinear(newMatrix, horizontalDelta: horizontalDelta))
{
FlushTextElementSoft();
_textMatrix = newMatrix;
return;
}
}
FlushTextElement();
_textMatrix = newMatrix;
_textMatrixCurrent = _textMatrix.Copy();
}
private void OpTextPut(string text)
{
if (inText == false) { return; }
@@ -496,14 +465,14 @@ namespace VAR.PdfTools
{
foreach (char c in text)
{
string realChar = _font.ToUnicode(c);
if (realChar == "\0") { continue; }
_listCharacters.Add(new PdfCharElement { Char = _font.ToUnicode(c), Displacement = _textWidth, });
double charWidth = _font.GetCharWidth(c) * _fontSize;
_textWidth += charWidth;
_textWidth += ((c == 0x20) ? _wordSpacing : _charSpacing);
}
}
else
{
_textWidth += text.Length * _fontSize * 0.5;
}
}
private void OpTextPutMultiple(PdfArray array)
@@ -511,17 +480,16 @@ namespace VAR.PdfTools
if (inText == false) { return; }
foreach (IPdfElement elem in array.Values)
{
if(elem is PdfString)
if (elem is PdfString)
{
OpTextPut(((PdfString)elem).Value);
}
else if(elem is PdfInteger || elem is PdfReal)
else if (elem is PdfInteger || elem is PdfReal)
{
// FIXME: Apply correctly spacing
//double spacing = PdfElementUtils.GetReal(elem, 0);
//_textWidth += spacing;
double spacing = PdfElementUtils.GetReal(elem, 0);
_textWidth -= (spacing / 1000) * _fontSize;
}
else if(elem is PdfArray)
else if (elem is PdfArray)
{
OpTextPutMultiple(((PdfArray)elem));
}
@@ -538,7 +506,8 @@ namespace VAR.PdfTools
for (int i = 0; i < _page.ContentActions.Count; i++)
{
PdfContentAction action = _page.ContentActions[i];
// Graphics Operations
// Special graphics state
if (action.Token == "q")
{
OpPushGraphState();
@@ -569,11 +538,13 @@ namespace VAR.PdfTools
}
else if (action.Token == "Tc")
{
// FIXME: Char spacing
double charSpacing = PdfElementUtils.GetReal(action.Parameters[0], 0);
OpTextCharSpacing(charSpacing);
}
else if (action.Token == "Tw")
{
// FIXME: Word spacing
double wordSpacing = PdfElementUtils.GetReal(action.Parameters[0], 0);
OpTextWordSpacing(wordSpacing);
}
else if (action.Token == "Tz")
{
@@ -581,7 +552,7 @@ namespace VAR.PdfTools
}
else if (action.Token == "Tf")
{
string fontName = ((PdfName)action.Parameters[0]).Value;
string fontName = PdfElementUtils.GetString(action.Parameters[0], string.Empty);
double fontSize = PdfElementUtils.GetReal(action.Parameters[1], 0);
OpTextFont(fontName, fontSize);
}
@@ -627,18 +598,23 @@ namespace VAR.PdfTools
}
else if (action.Token == "Tj")
{
OpTextPut(((PdfString)action.Parameters[0]).Value);
string text = PdfElementUtils.GetString(action.Parameters[0], string.Empty);
OpTextPut(text);
}
else if (action.Token == "'")
{
string text = PdfElementUtils.GetString(action.Parameters[0], string.Empty);
OpTextLineFeed();
OpTextPut(((PdfString)action.Parameters[0]).Value);
OpTextPut(text);
}
else if (action.Token == "\"")
{
double wordSpacing = PdfElementUtils.GetReal(action.Parameters[0], 0);
double charSpacing = PdfElementUtils.GetReal(action.Parameters[1], 0);
OpTextPut(((PdfString)action.Parameters[2]).Value);
string text = PdfElementUtils.GetString(action.Parameters[0], string.Empty);
OpTextCharSpacing(charSpacing);
OpTextWordSpacing(wordSpacing);
OpTextPut(text);
}
else if (action.Token == "TJ")
{
@@ -704,7 +680,7 @@ namespace VAR.PdfTools
public List<string> GetColumn(string column, bool fuzzy)
{
PdfTextElement columnHead = FindElementByText(column, fuzzy);
if(columnHead == null)
if (columnHead == null)
{
return new List<string>();
}
@@ -717,7 +693,7 @@ namespace VAR.PdfTools
double extentX2 = double.MaxValue;
foreach (PdfTextElement elem in _textElements)
{
if(elem == columnHead){continue;}
if (elem == columnHead) { continue; }
if (TextElementHorizontalIntersection(columnHead, elem) == false) { continue; }
double elemX1 = elem.GetX();
double elemX2 = elemX1 + elem.VisibleWidth;
@@ -798,7 +774,7 @@ namespace VAR.PdfTools
fieldData.Add(elem);
}
if(fieldData.Count == 0)
if (fieldData.Count == 0)
{
return null;
}