lab 3.1

Program Lab3task1;

{$APPTYPE CONSOLE}

Uses
  SysUtils;

Function ChoiceCheck() : Integer;
Var
    Choice: Integer;
    IsCorrect: Boolean;
Begin
    Repeat
        IsCorrect:=True;
        Try
            Readln(Choice);
        Except
            Writeln('Error! Input a number');
            IsCorrect := False;
        End;
        If (IsCorrect And ((Choice < 1) Or (Choice > 2))) Then
        Begin
            Writeln('Error! Input 1 or 2');
            IsCorrect := False;
        End;
    Until  (IsCorrect);
    ChoiceCheck := Choice;
End;

Function InputCheck(): String;
Var
    IsCorrect: Boolean;
    Str: String;
    I: Integer;
Begin
    Repeat
        Writeln ('Input the string consisting of numbers, letters of the English alphabet and symbols "-", "+", "." ');
        IsCorrect := True;
        Readln(Str);
        For I:=1 To Length(Str) Do
        Case Ord(Str[I]) Of
            1..42, 44, 47, 58..64, 91..96, 123..255: IsCorrect :=  False;
        End;
        If Not(IsCorrect) Then
        Writeln('Incorrect string format');
    Until  (IsCorrect);
    InputCheck := Str;
End;

Function CheckInputFilePath(): String;
Var
    Path: String;
    IsCorrect: Boolean;
    InputFile: File;
Begin
    Repeat
        Writeln('Input path to the file');
        IsCorrect := True;
        Readln(Path);
        If (Not(FileExists(Path))) Then
        Begin
            IsCorrect := False;
            Writeln('Could not find the file');
        End;
        If (IsCorrect) Then
        Begin
            Try
                AssignFile(InputFile, Path);
                ReSet(InputFile);
            Except
                IsCorrect := False;
                Writeln('Could not open the file');
            End;
        End;
    Until (IsCorrect);
    CloseFile(InputFile);
    CheckInputFilePath := Path;
End;

Function FileCheckString() : String;
Var
    InputFile: TextFile;
    I: Integer;
    Path, Str: String;
    IsCorrect: Boolean;
Begin
    Repeat
        Path := CheckInputFilePath();
        IsCorrect := True;
        AssignFile(InputFile, Path);
        Reset(Inputfile);
        Read(InputFile, Str);
        If (IsCorrect And (Length(Str) < 1)) Then
        Begin
            IsCorrect := False;
            Writeln ('The string is empty');
        End;
        If ((IsCorrect) And Not(EoF(InputFile))) Then
        Begin
            IsCorrect := False;
            Writeln ('There should be only one string in the file');
        End;
        If (IsCorrect) Then
        Begin
            For I:=1 To Length(Str) Do
            Case Ord(Str[I]) Of
                1..42, 44, 47, 58..64, 91..96, 123..255: IsCorrect :=  False;
            End;
            If Not(IsCorrect) Then
            Writeln('Incorrect string format');
        End;

    Until (IsCorrect);
    FileCheckString := Str;
End;

Function InputChoice (): String;
Var
    Str: String;
    Choice: Integer;
Begin
    Writeln('Choose input option: ', #10, '1.Input from console', #10,
            '2.Input from file');
    Choice := ChoiceCheck();
    If (Choice = 1)  Then
    Str := InputCheck()
    Else
    Str:= FileCheckString();
    InputChoice := Str;
End;

Function CheckOutputFilePath(): String;
Var
    Path: String;
    IsCorrect: Boolean;
    OutputFile: File;
Begin
    Writeln('Input file path and the name of the file for', #10, 'example, Ñ:\Projects\Number\FileName.txt. If the ', #10, 'file does not exist, then it will be created', #10,'automatically in the root folder of the program');
    IsCorrect := True;
    Readln(Path);
    If (Not(FileExists(Path))) Then
    Begin
        IsCorrect := False;
        Writeln('Could not find the file');
    End;
    If (IsCorrect)Then
    Try
        AssignFile(OutputFile, Path);
        ReSet(OutputFile);
    Except
        IsCorrect := False;
        Writeln('Could not open the file');
    End;
    If (Not(IsCorrect)) Then
    Begin
    Writeln ('File will be created in the root folder of the program');
    Path := 'Result.txt';
    End
    Else
    CloseFile(OutputFile);
    CheckOutputFilePath := Path;
End;

Procedure FindConsoleSubStr(Str: String);
Var
SubStr: String;
I: Integer;
IsFound: Boolean;
Begin
    IsFound := False;
    For I := 1 to Length(Str) Do
        Case Ord(Str[I]) Of
            43, 45: Begin
                        If (Length(SubStr)>1) Then
                            Writeln(Substr)
                        Else
                            If (Str[I-1]='0') Then
                                Writeln('0');
                        SubStr := ''+Str[I];
                        IsFound := True;
                    End;
            46, 65..90, 97..122: Begin
                                     IsFound := False;
                                         If (Length(SubStr)>1) Then
                                             Writeln (SubStr)
                                         Else
                                         If (Str[I-1]='0') Then
                                             Writeln('0');
                                     SubStr := '';
                                 End;
            48:  If (IsFound) And Not((Substr[Length(Substr)]='+') Or (Substr[Length(Substr)]='-')) Then
                    SubStr:= SubStr+Str[I];
            49..57: If (IsFound) Then
                    SubStr:= SubStr+Str[I];
        End;
        If (IsFound) And (Length(SubStr)>1) Then
            Writeln (SubStr);
End;

Procedure FindFileSubStr(Str: String);
Var
SubStr, Path: String;
I: Integer;
IsFound: Boolean;
OutputFile: TextFile;
Begin
    Path:=CheckOutputFilePath();
    AssignFile (OutputFile, Path);
    Rewrite(OutputFile);
    IsFound := False;
    For I := 1 to Length(Str) Do
        Case Ord(Str[I]) Of
            43, 45: Begin
                        If (Length(SubStr)>1) Then
                            Writeln (OutputFile, SubStr)
                        Else
                            If (Str[I-1]='0') Then
                                Writeln(OutputFile, '0');
                        SubStr := ''+Str[I];
                        IsFound := True;
                    End;
            46, 65..90, 97..122: Begin
                                     IsFound := False;
                                     If (Length(SubStr)>1) Then
                                         Writeln (OutputFile, SubStr)
                                     Else
                                         If (Str[I-1]='0') Then
                                             Writeln(OutputFile, '0');
                                     SubStr := '';
                                 End;
            48:  If (IsFound) And Not((Substr[Length(Substr)]='+') Or (Substr[Length(Substr)]='-')) Then
                    SubStr:= SubStr+Str[I];
            49..57: If (IsFound) Then
                    SubStr:= SubStr+Str[I];
        End;
        If (IsFound) And (Length(SubStr)>1) Then
        Writeln (OutputFile, SubStr);
        Close(OutputFile);
    Writeln('Successful output');
End;

Procedure OutputChoice (Str: String);
Var
    Choice: Integer;
Begin
    Writeln('Choose output option: ', #10, '1.Output through console', #10,
              '2.Output through file');
    Choice := ChoiceCheck();
    If (Choice = 1) Then
    FindConsoleSubStr(Str)
    Else
    FindFileSubStr(Str);
End;

Var
    Str: String;
Begin
    Str :=  InputChoice();
    OutputChoice(Str);
    Readln
End.