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{ Copyright (C) <2005> <Andrew Haines> htmlutil.pas
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
}
{
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
}
{ modified from jsFastHtmlParser for use with freepascal
Original Author:
James Azarja
Contributor:
Lars aka L505
http://z505.com
Note: this isn't perfect, it needs to be improved.. see comments }
unit HTMLUtil; {$ifdef fpc} {$MODE Delphi} {$H+}{$endif}
interface
uses
SysUtils, strutils;
{ most commonly used }
function GetVal(tag, attribname_ci: string): string;
function GetTagName(Tag: string): string;
{ less commonly used, but useful }
function GetUpTagName(tag: string): string;
function GetNameValPair(tag, attribname_ci: string): string;
function GetValFromNameVal(namevalpair: string): string;
{ old buggy code}
function GetVal_JAMES(tag, attribname_ci: string): string;
function GetNameValPair_JAMES(tag, attribname_ci: string): string;
{ rarely needed NAME= case sensitivity }
function GetNameValPair_cs(tag, attribname: string): string;
implementation
function CopyBuffer(StartIndex: PChar; Len: integer): string;
var s : String;
begin
SetLength(s, Len);
StrLCopy(@s[1], StartIndex, Len);
result:= s;
end;
{ Return tag name, case preserved }
function GetTagName(Tag: string): string;
var
P : Pchar;
S : Pchar;
begin
P := Pchar(Tag);
while P^ in ['<',' ',#9] do inc(P);
S := P;
while Not (P^ in [' ','>',#0]) do inc(P);
if P > S then
Result := CopyBuffer( S, P-S)
else
Result := '';
end;
{ Return tag name in uppercase }
function GetUpTagName(tag: string): string;
var
P : Pchar;
S : Pchar;
begin
P := Pchar(uppercase(Tag));
while P^ in ['<',' ',#9] do inc(P);
S := P;
while Not (P^ in [' ','>',#0]) do inc(P);
if P > S then
Result := CopyBuffer( S, P-S)
else
Result := '';
end;
{ Return name=value pair ignoring case of NAME, preserving case of VALUE
Lars' fixed version }
function GetNameValPair(tag, attribname_ci: string): string;
var
P : Pchar;
S : Pchar;
UpperTag,
UpperAttrib : string;
Start: integer;
L : integer;
C : char;
begin
// must be space before case insensitive NAME, i.e. <a HREF="" STYLE=""
UpperAttrib:= ' ' + Uppercase(attribname_ci);
UpperTag:= Uppercase(Tag);
P:= Pchar(UpperTag);
S:= StrPos(P, Pchar(UpperAttrib));
if S <> nil then
begin
inc(S); // skip space
P:= S;
// Skip
while not (P^ in ['=', ' ', '>', #0]) do
inc(P);
if (P^ = '=') then inc(P);
while not (P^ in [' ','>',#0]) do
begin
if (P^ in ['"','''']) then
begin
C:= P^;
inc(P); { Skip quote }
end else
C:= ' ';
{ thanks to Dmitry [mail@vader.ru] }
while not (P^ in [C, '>', #0]) do
Inc(P);
if (P^ <> '>') then inc(P); { Skip current character, except '>' }
break;
end;
L:= P - S;
Start:= S - Pchar(UpperTag);
P:= Pchar(Tag);
S:= P;
inc(S, Start);
result:= CopyBuffer(S, L);
end;
end;
{ Get value of attribute, e.g WIDTH=36 -return-> 36, preserves case sensitive }
function GetValFromNameVal(namevalpair: string): string;
var
P: Pchar;
S: Pchar;
C: Char;
begin
P:= Pchar(namevalpair);
S:= StrPos(P, '=');
if S <> nil then
begin
inc(S); // skip equal
P:= S; // set P to a character after =
if (P^ in ['"','''']) then
begin
C:= P^;
Inc(P); { Skip current character }
end else
C:= ' ';
S:= P;
while not (P^ in [C, #0]) do
inc(P);
if (P <> S) then { Thanks to Dave Keighan (keighand@yahoo.com) }
Result:= CopyBuffer(S, P - S)
else
Result:= '';
end;
end;
{ return value of an attribute (attribname_ci), case ignored for NAME portion, but return value case is preserved }
function GetVal(tag, attribname_ci: string): string;
var namevalpair: string;
begin
// returns full name=value pair
namevalpair:= GetNameValPair(tag, attribname_ci);
// extracts value portion only
result:= GetValFromNameVal(namevalpair);
end;
{ ----------------------------------------------------------------------------
BELOW FUNCTIONS ARE OBSOLETE OR RARELY NEEDED SINCE THEY EITHER CONTAIN BUGS
OR THEY ARE TOO CASE SENSITIVE (FOR THE TAG NAME PORTION OF THE ATTRIBUTE }
{ James old buggy code for testing purposes.
Bug: when finding 'ID', function finds "width", even though width <> "id" }
function GetNameValPair_JAMES(tag, attribname_ci: string): string;
var
P : Pchar;
S : Pchar;
UT,
UA : string;
Start: integer;
L : integer;
C : char;
begin
UA:= Uppercase(attribname_ci);
UT:= Uppercase(Tag);
P:= Pchar(UT);
S:= StrPos(P, Pchar(UA));
if S <> nil then
begin
P := S;
// Skip attribute name
while not (P^ in ['=',' ','>',#0]) do
inc(P);
if (P^ = '=') then inc(P);
while not (P^ in [' ','>',#0]) do
begin
if (P^ in ['"','''']) then
begin
C:= P^;
inc(P); { Skip current character }
end else
C:= ' ';
{ thanks to Dmitry [mail@vader.ru] }
while not (P^ in [C, '>', #0]) do
Inc(P);
if (P^ <> '>') then inc(P); { Skip current character, except '>' }
break;
end;
L:= P - S;
Start:= S - Pchar(UT);
P:= Pchar(Tag);
S:= P;
inc(S, Start);
result:= CopyBuffer(S, L);
end;
end;
{ James old buggy code for testing purposes }
function GetVal_JAMES(tag, attribname_ci: string): string;
var namevalpair: string;
begin
namevalpair:= GetNameValPair_JAMES(tag, attribname_ci);
result:= GetValFromNameVal(namevalpair);
end;
{ return name=value portion, case sensitive, case preserved }
function GetNameValPair_cs(Tag, attribname: string): string;
var
P : Pchar;
S : Pchar;
C : Char;
begin
P := Pchar(Tag);
S := StrPos(P, Pchar(attribname));
if S<>nil then
begin
P := S;
// Skip attribute name
while not (P^ in ['=',' ','>',#0]) do
inc(P);
if (P^ = '=') then inc(P);
while not (P^ in [' ','>',#0]) do
begin
if (P^ in ['"','''']) then
begin
C:= P^;
inc(P); { Skip current character }
end else
C:= ' ';
{ thanks to Dmitry [mail@vader.ru] }
while not (P^ in [C, '>', #0]) do
inc(P);
if (P^<>'>') then inc(P); { Skip current character, except '>' }
break;
end;
if P > S then
Result:= CopyBuffer(S, P - S)
else
Result:= '';
end;
end;
end.
(* alternative, not needed
{ return value (case preserved) from a name=value pair, ignores case in given NAME= portion }
function GetValFromNameVal(namevalpair: string): string;
type
TAttribPos = record
startpos: longword; // start pos of value
len: longword; // length of value
end;
{ returns case insensitive start position and length of just the value
substring in name=value pair}
function ReturnPos(attribute: string): TAttribPos;
var
P : Pchar;
S : Pchar;
C : Char;
begin
result.startpos:= 0;
result.len:= 0;
P:= Pchar(uppercase(Attribute));
// get substring including and everything after equal
S:= StrPos(P, '=');
result.startpos:= pos('=', P);
if S <> nil then
begin
inc(S);
// set to character after =
inc(result.startpos);
P:= S;
if (P^ in ['"','''']) then
begin
C:= P^;
// skip quote
inc(P);
inc(result.startpos);
end else
C:= ' ';
S:= P;
// go to end quote or end of value
while not (P^ in [C, #0]) do
inc(P);
if (P <> S) then
begin
result.len:= p - s;
end;
end;
end;
var
found: TAttribPos;
begin
found:= ReturnPos(namevalpair);
// extract using coordinates
result:= MidStr(namevalpair, found.startpos, found.len);
end;
*)
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