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elna/source/CommandLineInterface.elna

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(* This Source Code Form is subject to the terms of the Mozilla Public License,
v. 2.0. If a copy of the MPL was not distributed with this file, You can
obtain one at https://mozilla.org/MPL/2.0/. *)
module;
from Args import GetArg, Narg;
from FIO import WriteString, WriteChar, WriteLine, StdErr;
from Storage import ALLOCATE;
from Strings import CompareStr, Length;
from MemUtils import MemZero;
from Common import ShortString;
type
CommandLine = record
input: ShortString;
output: ShortString;
lex: Bool;
parse: Bool
end;
proc parse_command_line*() -> ^CommandLine;
var
parameter: ShortString;
i: Word;
result: ^CommandLine;
parsed: Bool;
begin
i := 1u;
NEW(result);
result^.lex := false;
result^.parse := false;
MemZero(@result^.input, 256);
result^.output[1] := CHAR(0);
while (i < Narg()) & (result <> nil) do
parsed := GetArg(parameter, i);
parsed := false;
if CompareStr(parameter, '--lex') = 0 then
parsed := true;
result^.lex := true
end;
if CompareStr(parameter, '--parse') = 0 then
parsed := true;
result^.parse := true
end;
if CompareStr(parameter, '-o') = 0 then
i := i + 1u;
if i = Narg() then
WriteString(StdErr, 'Fatal error: expecting a file name following -o.');
result := nil
end;
if i < Narg() then
parsed := GetArg(parameter, i);
result^.output := parameter
end;
parsed := true
end;
if (parameter[1] <> '-') & (parsed = false) then
parsed := true;
if Length(result^.input) > 0 then
WriteString(StdErr, 'Fatal error: only one source file can be compiled at once. First given "');
WriteString(StdErr, result^.input);
WriteString(StdErr, '", then "');
WriteString(StdErr, parameter);
WriteString(StdErr, '".');
WriteLine(StdErr);
result := nil
end;
if result <> nil then
result^.input := parameter
end
end;
if parsed = false then
WriteString(StdErr, 'Fatal error: unknown command line options: ');
WriteString(StdErr, parameter);
WriteChar(StdErr, '.');
WriteLine(StdErr);
result := nil
end;
i := i + 1
end;
if (result <> nil) & (Length(result^.input) = 0) then
WriteString(StdErr, 'Fatal error: no input files.');
WriteLine(StdErr);
result := nil
end;
return result
end;
end.