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Diffstat (limited to 'libraries/std/textio.vhdl')
| -rw-r--r-- | libraries/std/textio.vhdl | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libraries/std/textio.vhdl b/libraries/std/textio.vhdl new file mode 100644 index 0000000..71b3ca7 --- /dev/null +++ b/libraries/std/textio.vhdl @@ -0,0 +1,130 @@ +-- Std.Textio package declaration. This file is part of GHDL. +-- This file was written from the clause 14.3 of the VHDL LRM. +-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold +-- +-- GHDL is free software; you can redistribute it and/or modify it under +-- the terms of the GNU General Public License as published by the Free +-- Software Foundation; either version 2, or (at your option) any later +-- version. +-- +-- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY +-- WARRANTY; without even the implied warranty of MERCHANTABILITY or +-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +-- for more details. +-- +-- You should have received a copy of the GNU General Public License +-- along with GCC; see the file COPYING. If not, write to the Free +-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA +-- 02111-1307, USA. + +package textio is + +-- type definitions for text i/o + + -- a LINE is a pointer to a string value. + type line is access string; + + -- A file of variable-length ASCII records. + -- Note: in order to work correctly, the TEXT file type must be declared in + -- the textio package of library std. Otherwise, a file of string has a + -- non-ASCII format. + type text is file of string; + + type side is (right, left); -- For justifying ouput data within fields. + subtype width is natural; -- For specifying widths of output fields. + +-- standard text files + + file input: text is in "STD_INPUT"; --V87 + file output: text is out "STD_OUTPUT"; --V87 + file input : text open read_mode is "STD_INPUT"; --V93 + file output : text open write_mode is "STD_OUTPUT"; --V93 + +-- input routines for standard types + + procedure readline (variable f: in text; l: inout line); --V87 + procedure readline (file f: text; l: inout line); --V93 + + -- For READ procedures: + -- In this implementation, any L is accepted (ie, there is no constraints + -- on direction, or left bound). Therefore, even variable of type LINE + -- not initialized by READLINE are accepted. Strictly speaking, this is + -- not required by LRM, nor prevented. However, other implementations may + -- fail at parsing such strings. + -- + -- Also, in case of error (GOOD is false), this implementation do not + -- modify L (as specified by the LRM) nor VALUE. + -- + -- For READ procedures without a GOOD argument, an assertion fails in case + -- of error. + -- + -- In case of overflow (ie, if the number is out of the bounds of the type), + -- the procedure will fail with an execution error. + -- FIXME: this should not occur for a bad string. + + procedure read (l: inout line; value: out bit; good: out boolean); + procedure read (l: inout line; value: out bit); + + procedure read (l: inout line; value: out bit_vector; good: out boolean); + procedure read (l: inout line; value: out bit_vector); + + procedure read (l: inout line; value: out boolean; good: out boolean); + procedure read (l: inout line; value: out boolean); + + procedure read (l: inout line; value: out character; good: out boolean); + procedure read (l: inout line; value: out character); + + procedure read (l: inout line; value: out integer; good: out boolean); + procedure read (l: inout line; value: out integer); + + procedure read (l: inout line; value: out real; good: out boolean); + procedure read (l: inout line; value: out real); + + procedure read (l: inout line; value: out string; good: out boolean); + procedure read (l: inout line; value: out string); + + -- This implementation requires no space after the unit identifier, + -- ie "7.5 nsv" is parsed as 7.5 ns. + -- The unit identifier can be in lower case, upper case or mixed case. + procedure read (l: inout line; value: out time; good: out boolean); + procedure read (l: inout line; value: out time); + +-- output routines for standard types + + procedure writeline (variable f: out text; l: inout line); --V87 + procedure writeline (file f: text; l: inout line); --V93 + + -- This implementation accept any value for all the types. + procedure write + (l: inout line; value: in bit; + justified: in side := right; field: in width := 0); + procedure write + (l: inout line; value: in bit_vector; + justified: in side := right; field: in width := 0); + procedure write + (l: inout line; value: in boolean; + justified: in side := right; field: in width := 0); + procedure write + (l: inout line; value: in character; + justified: in side := right; field: in width := 0); + procedure write + (l: inout line; value: in integer; + justified: in side := right; field: in width := 0); + procedure write + (L: inout line; value: in real; + justified: in side := right; field: in width := 0; + digits: in natural := 0); + procedure write + (l: inout line; value: in string; + justified: in side := right; field: in width := 0); + + -- UNIT must be a unit name declared in std.standard. Of course, no rules + -- in the core VHDL language prevent you from using a value that is not a + -- unit (eg: 10 ns or even 5 fs). + -- An assertion error message is generated in this case, and question mark + -- (?) is written at the place of the unit name. + procedure write + (l: inout line; value : in time; + justified: in side := right; field: in width := 0; unit : in TIME := ns); + +end textio; |