DotAttributes Class Reference

Class representing an attribute list of a dot graph object. More...

#include <src/dotattributes.h>

Collaboration diagram for DotAttributes:

Public Member Functions
	DotAttributes (const DString &input)
	Creates an instance of a DotAttribute list given its initial string representation.
DString	str () const
	Return the string representation of the attribute list.
void	updateValue (const DString &key, const DString &inpValue)

Private Attributes
DString	m_input

Detailed Description

Class representing an attribute list of a dot graph object.

Definition at line 26 of file dotattributes.h.

Constructor & Destructor Documentation

DotAttributes()

DotAttributes::DotAttributes ( const DString & input )

inline

Creates an instance of a DotAttribute list given its initial string representation.

Definition at line 30 of file dotattributes.h.

: m_input(input) {}

References m_input.

Member Function Documentation

str()

DString DotAttributes::str ( ) const

inline

Return the string representation of the attribute list.

Definition at line 33 of file dotattributes.h.

{ return m_input; }

References m_input.

Referenced by Config::updateObsolete().

updateValue()

void DotAttributes::updateValue ( const DString & key, const DString & inpValue )

inline

update a given attribute with a new value. If the attribute is not found a new attribute will be appended.

Definition at line 37 of file dotattributes.h.

    {
      // look for key\s*=
      const std::string regStr = key.str()+R"(\s*=)";
      const reg::Ex re { regStr };
      reg::Match match;
      std::string s = m_input.str();
      if (reg::search(s,match,re)) // replace existing attribute
      {
        size_t len      = s.length();
        size_t startPos = match.position()+match.length(); // position after =
        size_t pos      = startPos;
        while (pos<len && disspace(s[pos])) pos++;
        if (pos<len && s[pos]=='"') // quoted value, search for end quote, ignoring escaped quotes
        {
          char pc=s[pos];
          pos++; // skip over start quote
          while (pos<len && (s[pos]!='"' || (s[pos]=='"' && pc=='\\'))) pc=s[pos++];
          if (pos<len) pos++; // skip over end quote
        }
        else // unquoted value, search for attribute separator (space,comma, or semicolon)
        {
          while (pos<len && s[pos]!=',' && s[pos]!=';' && !disspace(s[pos])) pos++;
        }
        DString value;
        if (inpValue.empty())
        {
          value = m_input.mid(startPos,pos-startPos);
        }
        else
        {
          value = inpValue;
        }
        // pos is now the position after the value, so replace the part between [start..pos) with the new value
        m_input=m_input.left(startPos)+value.quoted()+m_input.mid(pos);
      }
      else // append new attribute
      {
        if (!inpValue.empty())
        {
          if (!m_input.empty()) m_input+=",";
          m_input+=key+"="+inpValue.quoted();
        }
      }
    }

References disspace(), DString::empty(), DString::left(), m_input, DString::mid(), DString::quoted(), reg::search(), and DString::str().

Referenced by updateAttribute().

Member Data Documentation

m_input

DString DotAttributes::m_input

private

Definition at line 84 of file dotattributes.h.

Referenced by DotAttributes(), str(), and updateValue().

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The documentation for this class was generated from the following file:

• src/dotattributes.h