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unit gui_mig_constraintparser;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, gui_mig_lc;
type
TConstraintParser = class(TObject)
public
function ParseLayoutConstraint(const s: string): TLC;
end;
implementation
uses
gfx_tokenlibrary;
{ TConstraintParser }
function TConstraintParser.ParseLayoutConstraint(const s: string): TLC;
var
tokenizer: TTokens;
parts: TStringList;
part: string;
i: integer;
len: integer;
begin
result := TLC.Create;
if s = '' then
Exit;
tokenizer := TTokens.Create(s, ',', '"', '"', '\', tsSingleSeparatorBetweenTokens);
parts := TStringList.Create;
for i := 1 to tokenizer.TokenCount do
parts.Add(trim(tokenizer.Token(i)));
tokenizer.Free;
// First check for "ltr" or "rtl" since that will affect the interpretation
// of the other constraints.
for i := 0 to parts.Count-1 do
begin
part := parts[i];
if part = '' then
continue;
len := Length(part);
if (len = 3) or (len = 11) then // optimization
begin
if (part = 'ltr') or (part = 'rtl') or (part = 'lefttoright') or (part = 'righttoleft') then
begin
result.LeftToRight_prop := part[1] = 'l';
parts[i] := ''; // so we don't process it again
end;
if (part = 'ttb') or (part = 'btt') or (part = 'toptobottom') or (part = 'bottomtotop') then
begin
result.TopToBottom_prop := part[1] = 't';
parts[i] := ''; // so we don't process it again
end;
end;
end;
for i := 0 to parts.Count-1 do
begin
part := parts[i];
if part = '' then
continue;
end;
parts.Free;
end;
end.
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