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% Release 0.1 (2021/04/13) of xintsession.tex
% author: Jean-Francois Burnol
% License: LPPL 1.3c (author-maintained)
% Usage: execute etex or pdftex
% then enter "xintsession" at the ** prompt
\input xintexpr.sty\relax%
\input xintbinhex.sty\relax%
\input polexpr.sty\relax% attention will crash if < 0.8
\let\PolToExprOneTerm\PolToExprOneTermStyleB%
%\let\PolToExprTimes\empty%
% we do assume standard catcodes on loading and use
% \XINT_restorecatcodes as a convenience facility.
% It stores \endlinechar but not \newlinechar
\edef\xsrestorecatcodes{\csname XINT_restorecatcodes\endcsname%
\newlinechar\the\newlinechar\relax}%
\endlinechar 13 %
\newlinechar 10
\catcode`_ 11
\catcode`& 11
\catcode`@ 11
\catcode`^ 11
\catcode`" 7
\catcode0 12
\newwrite\xs_out
\edef\xs_name{\jobname-\expandafter\xint_gobble_ii\the\year
\expandafter\xint_gobble_i\the\numexpr100+\month\relax
\expandafter\xint_gobble_i\the\numexpr100+\day\relax
_%
\expandafter\xint_gobble_i\the\numexpr(\time+30)/60+99h%
\expandafter\xint_gobble_i\the\numexpr100+\time-60*((\time+30)/60-1).tex}%
\immediate\openout\xs_out=\xs_name\relax
\begingroup\catcode37 12
\gdef\xs_message#1{\message{#1}\immediate\write\xs_out{%#1}}\endgroup
{\catcode13\active\def
{""J}\catcode32\active\edef {\string }%
\catcode`?=0\catcode`\\=12\relax%
?xdef?xs_logo{%
_____ _____
____ ____(_)________ /_________ _________________
__ |/_/_ /__ __ \ __/ _ \_ |/_/__ __ \_ ___/
__> < _ / _ / / / /_ / __/_> < __ /_/ / /
/_/|_| /_/ /_/ /_/\__/ \___//_/|_| _ .___//_/
/_/
_____ _____ __________
___(_)________ /__________________ ________ /___(_)__ ______
__ /__ __ \ __/ _ \_ ___/ __ `/ ___/ __/_ /__ | / / _ \
_ / _ / / / /_ / __/ / / /_/ // /__ / /_ _ / __ |/ // __/
/_/ /_/ /_/\__/ \___//_/ \__,_/ \___/ \__/ /_/ _____/ \___/
}%
?immediate?write128{%
xintsession 0.1
Copyright (c) Jean-Francois Burnol, 2021.
\jobname is ?jobname
Transcript will go to log and to ?xs_name
===> HIT THE <RET> KEY NOW! <===
}}%
\def\xs_no{0}%
\XINT_expr_defvar_one{@___}{{0}}%
\XINT_expr_defvar_one{@__}{{0}}%
\XINT_expr_defvar_one{@_}{{0}}%
\def\xs_fetch{\let\xs_in\empty\xs_fetch_a}%
\begingroup
\catcode13\active%
\gdef\xs_fetch_a#1
{%
\odef\xs_firstitem{\romannumeral0\xintfirstitem{#1.}}%
\ifcat\relax\expandafter\noexpand\xs_firstitem%
\expandafter\xs_cs%
\else%
\if &\expandafter\noexpand\xs_firstitem%
\expandafter\expandafter\expandafter\xs_magic%
\fi%
\fi%
\if;\expandafter\noexpand\romannumeral0\xintlastitem{#1}%
\xs_fetch_b#1^%
\else%
\message{(Use ; to end multi-line input)}%
\odef\xs_in{\xs_in#1}\expandafter\xs_fetch_a%
\fi%
}%
\endgroup
\def\xs_cs\if;\expandafter\noexpand\romannumeral0\xintlastitem#1#2\fi
{%
\xs_message{(executing \detokenize{#1} in background)}
#1\xs_fetch_a
}%
\def\xs_firstfour#1#2#3#4#5\xint_bye{#1#2#3#4}%
\def\xs_magic\if;\expandafter\noexpand\romannumeral0\xintlastitem#1#2\fi
{%
% this gets rid of spaces and an inadvertent ; except for &fp which is too
% short, but this puts a constraint on magic words, maybe I will revisit
\edef\xs_magic_in{\xs_firstfour#1\empty\empty\empty\empty\xint_bye}%
\ifcsname xs_magic@\xs_magic_in\endcsname
\csname xs_magic@\xs_magic_in\expandafter\endcsname
\else
\xs_message{(\detokenize\expandafter{\xint_gobble_i#1} is not a magic keyword:
ignored)}%
\fi\xs_fetch_a
}%
\def\xs_fetch_b#1;^%
{%
\odef\xs_in{\xs_in#1}\expandafter\xs_fetch_c
}%
\def\xs_fetch_c
{%
\if\relax\romannumeral`""@\detokenize\expandafter{\xs_in}\relax\expandafter\xs_pause\fi
\expandafter\xs_parse_a\xs_in:=^%
}%
\def\xs_pause\expandafter\xs_parse_a\xs_in:=^{\xs_pause_a\xs_fetch_a}%
\def\xs_pause_a\xs_fetch_a
{%
\xs_message{Need a break? OK, use \string\xintresume\space if you change your mind.}%
\xs_resetcats
}%
\def\xs_bye\xs_fetch_a
{%
\xs_message{Did I say something wrong?}%
\xs_message{Session transcript written on \xs_name}%
% \xs_resetcats
\immediate\closeout\xs_out
% expeditive exit because I need to think about generating new output
% filename with a check that it is not same (a minute may be too coarse?).
% Add random postfix? or simply do not bother rather...
\csname bye\endcsname
}%
\def\xs_parse_a#1:=#2%
{%
\xint_gob_til_^#2\xs_calc ^%
\def\xs_left{#1}\xs_parse_b#2%
}%
\def\xs_calc ^#1^%
{%
\edef\xs_no{\the\numexpr1+\xs_no}%
\xs_xintdefvar @_\xs_no=\xs_in;%
\immediate\write\xs_out
{\expandafter\string\xs_xintdefvar\space @_\xs_no:=%
\detokenize\expandafter{\xs_in};}%
\XINT_expr_defvar_one{@___}{\csname XINT_expr_varvalue_@__\endcsname}%
\XINT_expr_defvar_one{@__}{\csname XINT_expr_varvalue_@_\endcsname}%
\XINT_expr_defvar_one{@_}{\csname XINT_expr_varvalue_@_\xs_no\endcsname}%
\xs_message{(@_\xs_no)\space\space\space\space\xs_xinteval{@_\xs_no}}%
\xs_fetch
}%
\def\xs_parse_b #1:=^%
{%
\def\xs_right{#1}\expandafter\xs_parse_c\xs_left(;%
}%
\def\xs_parse_c #1(#2%
{%
\edef\xs_funcname{\expandafter\xint_zapspaces\detokenize{#1} \xint_gobble_i}%
\xint_gob_til_sc#2\xs_defvar;\xs_deffunc
}%
\def\xs_deffunc #1;%
{%
% attention: \xs_xintdeffunc needs to see parentheses immediately
\expandafter\xs_xintdeffunc\xs_left=\xs_right;%
\immediate\write\xs_out
{\expandafter\string\xs_xintdeffunc\space\detokenize\expandafter{\xs_left}:=%
\detokenize\expandafter{\xs_right};}%
\expandafter\ifx\xs_xintdeffunc\poldef
\xs_message{\xs_funcname\space = \PolToExpr{\xs_funcname}}%
\xs_message{Issue \string\PolGenFloatVariant{\xs_funcname} if fp evaluations
with \xs_funcname\space are intended}%
\else\xs_message{Function \xs_funcname\space defined}%
\fi\xs_fetch
}%
\def\xs_defvar;\xs_deffunc
{%
\edef\xs_no{\the\numexpr1+\xs_no}%
\xs_xintdefvar @_\xs_no=\xs_right;%
\immediate\write\xs_out
{\expandafter\string\xs_xintdefvar\space\detokenize\expandafter{\xs_left}:=%
\detokenize\expandafter{\xs_right};}%
\XINT_expr_defvar_one{@___}{\csname XINT_expr_varvalue_@__\endcsname}%
\XINT_expr_defvar_one{@__}{\csname XINT_expr_varvalue_@_\endcsname}%
\XINT_expr_defvar_one{@_}{\csname XINT_expr_varvalue_@_\xs_no\endcsname}%
% this is to allow multiple assignments
\expandafter\xs_xintdefvar\xs_left=@_\xs_no;%
\xs_message{(@_\xs_no)\space\space\space\space\xs_xinteval{@_\xs_no}}%
\xs_fetch
}%
\let\xs_magic@&pau\xs_pause_a
\let\xs_magic@&bye\xs_bye
\def\xs_magic@&fp
{%
\xs_message{fp mode (\xinttheDigits\space digits)}%
\def\xs_mode{fp}%
\def\xs_xintdefvar{\xintdeffloatvar}%
\def\xs_xintdeffunc{\xintdeffloatfunc}%
\def\xs_xinteval{\xintfloateval}%
}%
\expandafter\def\csname xs_magic@&fp1\endcsname
{%
\xintDigits*:=16;%
\xs_message{fp16 mode (trig reloaded)}%
\def\xs_mode{fp16}%
\def\xs_xintdefvar{\xintdeffloatvar}%
\def\xs_xintdeffunc{\xintdeffloatfunc}%
\def\xs_xinteval{\xintfloateval}%
}%
\expandafter\def\csname xs_magic@&fp2\endcsname
{%
\xintDigits*:=24;%
\xs_message{fp24 mode (trig reloaded)}%
\def\xs_mode{fp24}%
\def\xs_xintdefvar{\xintdeffloatvar}%
\def\xs_xintdeffunc{\xintdeffloatfunc}%
\def\xs_xinteval{\xintfloateval}%
}%
\expandafter\def\csname xs_magic@&fp3\endcsname
{%
\xintDigits*:=32;%
\xs_message{fp32 mode (trig reloaded)}%
\def\xs_mode{fp32}%
\def\xs_xintdefvar{\xintdeffloatvar}%
\def\xs_xintdeffunc{\xintdeffloatfunc}%
\def\xs_xinteval{\xintfloateval}%
}%
\def\xs_magic@&exa
{%
\xs_message{exact mode (floating point evaluations use \xinttheDigits\space digits)}%
\def\xs_mode{exact}%
\def\xs_xintdefvar{\xintdefvar}%
\def\xs_xintdeffunc{\xintdeffunc}%
\def\xs_xinteval{\xinteval}%
}%
\def\xs_magic@&int
{%
\xs_message{int mode (integer only: / rounds, // is floored division, /: is modulo)}%
\def\xs_mode{int}%
\def\xs_xintdefvar{\xintdefiivar}%
\def\xs_xintdeffunc{\xintdefiifunc}%
\def\xs_xinteval{\xintiieval}%
}%
\def\xs_magic@&pol
{%
\xs_message{pol mode (i.e. function definitions use \string\poldef)}%
\def\xs_mode{pol}%
\def\xs_xintdefvar{\xintdefvar}%
\def\xs_xintdeffunc{\poldef}%
\def\xs_xinteval{\xinteval}%
}%
\def\xs_magic@&mod{\xs_message{current mode: \xs_mode}}%
\def\xs_setcats
{%
\newlinechar10\endlinechar13%
\catcode13\active\catcode`@ 11\relax
}%
\def\xs_storecats{\edef\xs_resetcats
{%
\newlinechar\the\newlinechar
\endlinechar\the\endlinechar
\catcode13=\the\catcode13
\catcode`@\the\catcode`@\relax
}}%
\begingroup
\catcode13\active\catcode32\active%
\gdef\xintstart{\edef {\string }\xs_setcats\def
{""J}\message{\xs_logo
Welcome to xintexpr interactive mode!
- input is `;'-terminated and can extend over multiple lines,
- definitions must be done using the `:=' syntax, not `='.
Any line starting with a control sequence is executed in the
background, interrupted numerical input resumes at next prompt.
To pause, say either `;' or `&pause'.
To quit, say `&bye'.
For help say `&help'.
Starting in}\xs_magic@&exa\let
=\xs_fetch}\gdef\xintresume{\edef {\string }\xs_storecats\xs_setcats%
\message{Welcome back to xintexpr interactive mode!}\let
=\xs_fetch}\gdef\xs_help\xs_fetch_a{\def
{""J}\edef {\string }\message{%
- Terminate inputs using the `;' character.
- Input can extend over multiple lines (<RET> terminated).
- An empty input (`;' terminated) or the magic word `&pause' puts
the session on hold and switches to normal TeX interaction.
Use \string\xintresume to resume the session.
- The numerical engine can work in various modes:
* exact mode means using \string\xintexpr context,
* fp mode uses \string\xintfloatexpr,
* int mode uses integer-only \string\xintiiexpr,
* pol mode makes function definitions using \string\poldef.
To activate a mode enter `&<mode name>' at the prompt
- Lines starting with any control sequence are handed over to
TeX, and numerical input resumes on next line.
- To change the floating point precision enter at the prompt:
\string\xintDigits*:= <some number>;
then at next prompt switch to fp mode using `&fp'.
This can be done in the midst of a computation!
(1/5) HIT <RET> KEY
}\let
=\xs_help_b}\gdef\xs_help_b{\def
{""J}\message{%
- Specific toggles `&fp16', `&fp24', `&fp32' are already predefined.
- Issue `&mode' if you forgot in what mode you are currently in.
- Definitions (variables or functions) are done using `:='.
IMPORTANT: currently, using a `=' by oversight will cause
breakage because xintsession thinks it is then a numerical
evaluation, not a definition, but there is no `=' operator in
xintexpr syntax.
Perhaps in future it will be allowed to make definitions using
`=' and xintsession will check if it is not misinterpreting a
`=' from `<=', `>=', `!=', `==' or `seq()' syntax but this
currently was considered to add too much overhead for the
benefit.
- Parentheses present before the `:=' trigger a function
definition, else a variable definition is done.
(2/5) HIT <RET> KEY
}\let
=\xs_help_c}\gdef\xs_help_c{\def
{""J}\message{%
- Functions defined in one mode are not available for usage in other
modes without further steps; check xintexpr doc.
- Polynomial definitions (pol mode) are function definitions
(see polexpr documentation). To use a polynomial also as a
numerical function when back in `fp' mode, issue
\string\PolGenFloatVariant{<polname>} at the prompt.
- Variables defined in any mode can be used in any mode except:
* polynomials can be used as variables only in the pol and the
exact modes,
* integer only mode requires... integer only variables!
One can use num() wrapper see xintexpr documentation.
- Whenever a variable is defined, or a computation is performed,
the result is assigned a label @_<integer>. These automatic
variables can then be used in subsequent computations.
- In the case of a multi-variable assignment (see xintexpr doc)
the automatic variable @_<integer> holds the whole thing, which
may be a nutple or an ople, in addition to individual variables.
(3/5) HIT <RET> KEY
}\let
=\xs_help_d}\gdef\xs_help_d{\def
{""J}\message{%
- The special variables @_, @__, and @___ hold the last, next
to last and next to next to last evaluation results.
Known issues:
- The [P] optional argument of \string\xintfloateval can not
be used because it is not recognized by \string\xintdeffloatvar,
one can use the float() function with its second argument.
- Sometimes one wishes to use \string\xintexpr...\string\relax wrapper
inside fp mode; this is possible but can not be first in current
input line as it would trigger control sequence execution. Start
with 0+ or use parentheses.
- The output format of the exact and fp mode is not yet decided
at upstream xintexpr; in particular trailing zeros are not
trimmed and floating point numbers are printed in diverging
ways in exact vs fp modes. Besides, the exact mode does
not do a systematic reduction to lowest terms. Use the
reduce() function (or preduce()).
- By default, the ** and ^ operators operate only with integer
exponents in exact mode and with half-integers in fp mode.
Fractional powers are available via the pow(x,a) function.
(4/5) HIT <RET> KEY
}\let
=\xs_help_e}\gdef\xs_help_e{\def
{""J}\message{%
Known issues (cont.):
- Refer to xintexpr \string\poormanloghack documentation on
how to let fractional powers be available with ** or ^,
and check polexpr documentation for related information.
- A session transcript file is created which can be executed by
eTeX to redo all calculations; however @_, @__, and @__
will not be defined in this context so need to be manually
replaced by the suitable @_<integer>.
Future:
- a plot() function will be added at some point to export
coordinates into a tex file for usage either with PSTricks or
TikZ/pgf.
Caveat:
Misformed xintexpr input can drop you into TeX error mode.
In that case, try escaping using `S'. It does work sometimes.
Use `&bye' to terminate the session and the TeX run.
(5/5) You are back to the xintexpr interactive session! (mode: \xs_mode)
}\let
=\xs_fetch\xs_fetch_a}\endgroup
\let\xs_magic@&hel\xs_help
\xsrestorecatcodes
\csname xs_storecats\endcsname
\catcode13\active\def
{\xintstart
}\endinput%
|