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unit RemoveBlankLinesAfterProcHeader;
{(*}
(*------------------------------------------------------------------------------
Delphi Code formatter source code
The Original Code is RemoveBlankLinesAfterProcHeader, released May 2003.
The Initial Developer of the Original Code is Anthony Steele.
Portions created by Anthony Steele are Copyright (C) 1999-2008 Anthony Steele.
All Rights Reserved.
Contributor(s): Anthony Steele.
The contents of this file are subject to the Mozilla Public License Version 1.1
(the "License"). you may not use this file except in compliance with the License.
You may obtain a copy of the License at http://www.mozilla.org/NPL/
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied.
See the License for the specific language governing rights and limitations
under the License.
Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 2 or later (the "GPL")
See http://www.gnu.org/licenses/gpl.html
------------------------------------------------------------------------------*)
{*)}
{$mode delphi}
interface
uses SourceToken, SwitchableVisitor;
type
TRemoveBlankLinesAfterProcHeader = class(TSwitchableVisitor)
protected
function EnabledVisitSourceToken(const pcNode: TObject): Boolean; override;
public
constructor Create; override;
function IsIncludedInSettings: boolean; override;
end;
implementation
uses
JcfSettings, FormatFlags, Tokens, TokenUtils,
ParseTreeNodeType, ParseTreeNode;
function IsPlaceForBlankLineRemoval(const ptToken, ptNextSolidToken:
TSourceToken): boolean;
begin
Result := False;
if (ptToken = nil) or (ptNextSolidToken = nil) then
exit;
{ assume we're already under a procedure decl as tested below }
{ before the begin }
if ptToken.HasParentNode([nCompoundStatement] + ProcedureNodes) and
(ptNextSolidToken.TokenType = ttBegin) then
begin
Result := True;
exit;
end;
{ before the type, const, label, val }
if ptToken.HasParentNode(nDeclSection) and
(ptNextSolidToken.TokenType in [ttType, ttVar, ttConst, ttLabel]) then
begin
Result := True;
exit;
end;
end;
{ TRemoveBlankLinesAfterProcHeader }
constructor TRemoveBlankLinesAfterProcHeader.Create;
begin
inherited;
FormatFlags := FormatFlags + [eRemoveReturn];
end;
function TRemoveBlankLinesAfterProcHeader.EnabledVisitSourceToken(
const pcNode: TObject): Boolean;
var
lcSourceToken: TSourceToken;
lcNext, lcTest: TSourceToken;
liReturnCount: integer;
liMaxReturns: integer;
lcBlock: TParseTreeNode;
lcDeclSection: TParseTreeNode;
begin
Result := False;
lcSourceToken := TSourceToken(pcNode);
{ must be in procedure declarations or directives}
if not lcSourceToken.HasParentNode(ProcedureNodes) then
exit;
if lcSourceToken.TokenType <> ttReturn then
exit;
lcNext := lcSourceToken.NextTokenWithExclusions([ttWhiteSpace, ttReturn]);
if lcNext=nil then
exit;
{ it must be a 'var', 'const', 'type' or 'begin'
in the procedure defs/body section }
{ can be type, var etc. var}
if not IsPlaceForBlankLineRemoval(lcSourceToken, lcNext) then
exit;
liReturnCount := 0;
liMaxReturns := FormattingSettings.Returns.MaxBlankLinesInSection + 1;
lcTest := lcSourceToken;
// function fooo;
// --> no blank lines beetwen function/procedure declaration and sections.
// var, const, type, begin.
// find nBlock, can be grandfader or great-grandfather of node
lcDeclSection:=nil;
lcDeclSection:=lcNext.Parent;
if (lcDeclSection<>nil) and not (lcDeclSection.NodeType in [nDeclSection,nCompoundStatement]) then
lcDeclSection:=lcDeclSection.Parent;
if (lcDeclSection<>nil) and not (lcDeclSection.NodeType in [nDeclSection,nCompoundStatement]) then
lcDeclSection:=lcDeclSection.Parent;
if lcDeclSection<>nil then
begin
lcBlock:=lcDeclSection.Parent;
if (lcBlock<>nil) and (lcBlock.NodeType=nBlock) then
begin
//if lcBlock.IndexOfChild(lcDeclSection)=0 then //Only the first section of nBlock
liMaxREturns:=1;
end;
end;
{ remove all returns up to that point (except one) }
while (lcTest <> lcNext) do
begin
if (lcTest.TokenType = ttReturn) then
begin
// allow two returns -> 1 blank line
Inc(liReturnCount);
if (liReturnCount > liMaxReturns) then
BlankToken(lcTest);
end;
lcTest := lcTest.NextToken;
end;
end;
function TRemoveBlankLinesAfterProcHeader.IsIncludedInSettings: boolean;
begin
Result := FormattingSettings.Returns.RemoveProcedureDefReturns;
end;
end.
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