unit uengShaderFileHelper;

{$mode objfpc}{$H+}
{$I uengShaderFile.inc}

interface

uses
  uengShaderPart, uengShaderFileParser;

function IsValidIdentifier(const aIdent: String): Boolean;
function CheckEndToken(const aArgs: TengParseArgs; const aShaderPart: TengShaderPart): String;
function ExtractSearchResult(const aSender: TengShaderPart; const aIdent: String; const aList: TengShaderPartList; aLine: Integer = -1; aCol: Integer = -1; aFilename: String = ''): TengShaderPart;

type
  TkvpSearchResults = class(TengSearchResults)
  private
    fName: String;
  protected
    function CheckObj(const aPart: TengShaderPart; var aContinue: Boolean): Boolean; override;
  public
    constructor Create(const aName: String; const aSearchDefines, aSearchProperties: Boolean);
  end;

implementation

uses
  sysutils,
  uengShaderFileConstants, uengShaderFileTypes, uengShaderPartKeyValuePair;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function IsValidIdentifier(const aIdent: String): Boolean;
var
  i, len: Integer;
begin
  len := Length(aIdent);
  result := false;
  for i := 1 to len do
    if not (aIdent[i] in VALID_IDENT_CHARS) then
      exit;
  result := true;
end;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function CheckEndToken(const aArgs: TengParseArgs; const aShaderPart: TengShaderPart): String;
var
  oldLine, oldCol: Integer;
  param: TengTokenParameterList;
begin
  param := TengTokenParameterList.Create('');
  try
    oldLine := aArgs.Line;
    oldCol  := aArgs.Col;
    if not aArgs.ExtractToken(aShaderPart, param) then
      EengUnexpectedToken.Create(TOKEN_NONE, TOKEN_END, oldLine, oldCol, aShaderPart.Filename, aShaderPart);
    if (param[0].Name <> TOKEN_END) then
      EengUnexpectedToken.Create(param[0].Name, TOKEN_END, oldLine, oldCol, aShaderPart.Filename, aShaderPart);
    if (param.Count <> 1) then
      EengInvalidParamterCount.Create(TOKEN_END, 1, oldLine, oldCol, aShaderPart.Filename, aShaderPart);
    result := '';
  finally
    FreeAndNil(param);
  end;
end;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function ExtractSearchResult(const aSender: TengShaderPart; const aIdent: String; const aList: TengShaderPartList;
  aLine: Integer; aCol: Integer; aFilename: String): TengShaderPart;
var
  s: String;
  i: Integer;
begin
  result := nil;
  if Assigned(aSender) then begin
    if (aLine < 0) then
      aLine := aSender.Line;
    if (aCol < 0) then
      aCol := aSender.Col;
    if (aFilename = '') then
      aFilename := aSender.Filename;
  end;
  if (aList.Count <= 0) then
    raise EengUnknownIdentifier.Create(aIdent, aLine, aCol, aFilename, aSender);
  result := aList[0];
  if (aList.Count > 1) and Assigned(aSender) then begin
    s := Format('use of duplicate identifier: %s (%s %d:%d)', [aIdent, aList[0].Filename, aList[0].Line + 1, aList[0].Col]) + sLineBreak +
         'previously declared here:' + sLineBreak;
    i := 1;
    while (i < aList.Count) do begin
      s := s + Format('  %s %d:%d', [aList[i].Filename, aList[i].Line + 1, aList[i].Col]) + sLineBreak;
      inc(i);
    end;
    aSender.LogMsg(llWarning, s);
  end;
end;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TkvpSearchResults/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TkvpSearchResults.CheckObj(const aPart: TengShaderPart; var aContinue: Boolean): Boolean;
begin
  result := inherited CheckObj(aPart, aContinue);
  if result then
    result := ((aPart as TengShaderPartKeyValuePair).Name = fName);
end;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TkvpSearchResults.Create(const aName: String; const aSearchDefines, aSearchProperties: Boolean);
begin
  if aSearchDefines and aSearchProperties then
    inherited Create([TengShaderPartStatic, TengShaderPartProperty])
  else if aSearchDefines then
    inherited Create([TengShaderPartStatic])
  else if aSearchProperties then
    inherited Create([TengShaderPartProperty])
  else
    inherited Create([]);
  fName := aName;
end;

end.