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Home BasePack Stringl Procedures and Functions DetectNextTagInString
See also: ReadNextTagInString 

DetectNextTagInString

Unit:SDL_stringl
Class:none
Declaration:function DetectNextTagInString (const InString: string; var StartIdx, StopIdx: integer; const TagList: array of string; var Attrib: string; var IsClosingTag: boolean): integer;

The function DetectNextTagInString scans the string InString for the next XML tag identfier (either closing or opening tag), starting at or after the position StartIdx. The read tag is parsed, and the tag attributes are returned in the variable parameter Attrib. The positions of the beginning and the end of the tag are returned in the variable parameters StartIdx and StopIdx.

The function returns the index of the tag in the TagList. If the tag is not contained in the list, the index of the last tag of the tag list is returned. It is therefore recommended to include a dummy tag which indicates an invalid tag. The variable parameter IsClosingTag returns TRUE if the tag is a closing tag, otherwise a FALSE value is returned.

Hint 1: The returned tag index is base zero, i.e. it can be used as the ordinal of a corresponding enumerated type declaration (see example below).

Example: The following sample code shows how to use the function DetectNextTagInString. The valid XML tags are defined in the constant string array xmlTagIds. Note that the last tag is a dummy tag to account for invalid tags.  
type                                    {valid xml tags}
  TXmlTag = (xmlSizeX, xmlSizeY, xmlNrInsens, xmlMaxNeighb,
             xmlMaxSteps, xmlMaxAlpha, xmlInvalid);

const                                   {xml tag names}
  xmlTagIds : array[xmlSizeX..xmlInValid] of string =
            ('sizex', 'sizey', 'nrinsens', 'maxneighb',
             'maxsteps', 'maxalpha', 'invalidtag');

var
  attrib       : string;
  contents     : string;
  xmlTag       : TXmlTag;
  spos         : integer;
  epos         : integer;
  isclosingtag : boolean;

...
spos := 1;
xmltag := TXmlTag (DetectNextTagInString (TestStr, spos, epos,
                            xmlTagIds, attrib, isclosingtag));
...

 

Last Update: 2007-Mai-19