{*******************************************************}
{                                                       }
{       Methods of Sting                                }
{                                                       }
{       版权所有 (C) 2020 KngStr                        }
{                                                       }
{*******************************************************}

unit ksString;

interface

/// <summary>
/// 创建空白文件
/// </summary>
function CreateBlankFile(S: string): Boolean;
/// <summary>
/// 自动为已存在文件名加数字
/// </summary>
function AutoChangeFileName(AFile: string): string;
/// <summary>
/// 自动替换文件名中的非法字符为
/// </summary>
procedure ChangeInvalidFileNameChars(var FileName: string; AChar: Char = '_');

/// <summary>
/// 格式化秒为时间，冒号分割
/// </summary>
function FormatSeconds(const AValue: Int64): string; overload;
/// <summary>
/// 格式化秒为时间，冒号分割
/// </summary>
function FormatSeconds(const AValue: Integer): string; overload;
/// <summary>
/// 格式化秒为时间，冒号分割
/// </summary>
function FormatSeconds(const AValue: Double): string; overload;

/// <summary>
/// 是否中国手机号
///  13900000000
///  +8613900000000
///  +86 139 0000 0000
///  +86-139-0000-0000
/// </summary>
/// <param name="AOnlyNum">仅允许数字和开头的+</param>
function IsChineseMobileNumber(S: string; AOnlyNum: Boolean = False): Boolean;

implementation

uses
  Classes, SysUtils, IOUtils;

function CreateBlankFile(S: string): Boolean;
var
  FStrm: TFileStream;
begin
  Result := False;
  try
    FStrm := TFileStream.Create(S, fmCreate);
    if FStrm = nil then
      Exit;
    Result := True;
    FreeAndNil(FStrm);
  except
    FStrm := nil;
  end;
end;

function AutoChangeFileName(AFile: string): string;
var
  I: Integer;
  sPath, sExt: string;
begin
  Result := AFile;
  I := 0;
  sPath := ChangeFileExt(Result, '');
  sExt := ExtractFileExt(Result);
  while FileExists(Result) do begin
    Inc(I);
    Result := Format('%s(%d)%s', [sPath, I, sExt]);
  end;
end;

procedure ChangeInvalidFileNameChars(var FileName: string; AChar: Char);
var
  PFileName: PChar;
  FileNameLen: Integer;
  Ch: Char;
  I: Integer;
begin
  I := 0;
  PFileName := PChar(FileName);
  FileNameLen := Length(FileName);
  while I < FileNameLen do begin
    Ch := PFileName[I];

    if not TPath.IsValidFileNameChar(Ch) then
      PFileName[I] := AChar
    else
      Inc(I);
  end;
end;

function FormatSeconds(const AValue: Double): string; overload;
var
  h, m, s, ms: Integer;
begin
  ms := Trunc(Frac(AValue) * 1000);
  s := Trunc(AValue);
  m := s div 60;
  h := m div 60;
  if h > 0 then
    Result := Format('%.2d:%.2d:%.2d.%.3d', [h, m mod 60, s mod 60, ms])
  else
    Result := Format('%.2d:%.2d.%.3d', [m, s mod 60, ms]);
end;

function FormatSeconds(const AValue: Int64): string;
var
  h, m, s: Integer;
begin
  s := AValue;
  m := s div 60;
  h := m div 60;
  if h > 0 then
    Result := Format('%.2d:%.2d:%.2d', [h, m mod 60, s mod 60])
  else
    Result := Format('%.2d:%.2d', [m, s mod 60]);
end;

function FormatSeconds(const AValue: Integer): string; overload;
begin
  FormatSeconds(Int64(AValue));
end;

function IsChineseMobileNumber(S: string; AOnlyNum: Boolean): boolean;
var
  p: PChar;
  i: Integer;
begin
  Result := False;

  // 最短肯定是11位
  if (Length(S) < 11) then
    Exit;

  i := 0;
  p := PChar(S);
  while p^ <> #0 do begin
    if p^ = '+' then begin
      if i > 0 then // +号必须在第一位
        Exit;
      if (p[1] = '8') and (p[2] = '6') then // +86，而且是连续的
        Inc(p, 3)
      else
        Exit;
    end
    else if ((p^ >= '0') and (p^ <= '9')) then begin
      if (i = 0) and (p^ <> '1') then // 中国手机号都是1开头
        Exit;
      Inc(p);
      Inc(i);
    end
    else if (not AOnlyNum) and ((p^ = '-') or (p^ = ' ')) then
      Inc(p)
    else
      Exit;
  end;
  Result := i = 11; //中国手机号 11位
end;

end.