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Make Plex read from string
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Author
Topic: Make Plex read from string (Read 815 times)
Anonimista
New Member
Posts: 19
Make Plex read from string
«
on:
September 23, 2019, 01:49:26 pm »
Plex (lexer generator) reads from the standard input or from a file
Code: Pascal
[Select]
[+]
[-]
yyinput
,
yyoutput
:
Text
;
(* input and output file *)
Is there a way to make it read a string? ie I need to read a string as if it was a stream I guess.
Logged
marcov
Administrator
Hero Member
Posts: 11452
FPC developer.
Re: Make Plex read from string
«
Reply #1 on:
September 23, 2019, 02:10:59 pm »
Streams can be assigned to "text" variables. See Streamio.assignstream
Logged
lucamar
Hero Member
Posts: 4219
Re: Make Plex read from string
«
Reply #2 on:
September 23, 2019, 02:57:59 pm »
To complete Marco's answer, you can build a stream from a string by using a
TStringStream
, so it would be a two-step process: creating the stream from the string and then assigning a textfile to that stream with
StreamIO.AssignStream
.
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Turbo Pascal 3 CP/M - Amstrad PCW 8256 (512 KB !!!)
Lazarus/FPC 2.0.8/3.0.4 & 2.0.12/3.2.0 - 32/64 bits on:
(K|L|X)Ubuntu 12..18, Windows XP, 7, 10 and various DOSes.
Anonimista
New Member
Posts: 19
Re: Make Plex read from string
«
Reply #3 on:
September 23, 2019, 02:58:46 pm »
Thanks, it should work, here is a small test I did
Code: Pascal
[Select]
[+]
[-]
program
project1
;
{$mode objfpc}{$H+}
uses
streamio
,
classes
;
var
t
:
Text
;
s
:
string
;
stream
:
TStringStream
;
begin
stream
:
=
TStringStream
.
Create
(
'abcd'
)
;
assignstream
(
t
,
stream
)
;
reset
(
t
)
;
readln
(
t
,
s
)
;
writeln
(
s
)
;
readln
;
stream
.
Free
;
end
.
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Make Plex read from string
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