Seed7 Release 2021-01-06

[Thomas Mertes]

Hello,

I have released a new version of Seed7: seed7_05_20210106.tgz
The download is here: https://sourceforge.net/projects/seed7/files
Seed7 is also at GitHub: https://github.com/ThomasMertes/seed7
The Seed7 programming language has many interesting concepts, which
are explained at its Homepage: http://seed7.sourceforge.net

Notable changes in this release are:
- The way how in-parameters work has been improved. Now it is
possible to define a new type in an in-parameter declaration.
- The support for function types in interpreter and compiler has
been improved.
- The support to run and compile Seed7 with JavaScript has been
improved.

Changelog:
- The declaration of in-parameters has been changed to work the same
way as all other parameter declarations (val-, ref-, inout-, attr-
and in-var-parameters). Many thanks go to Zachary Menzies for
pointing out a problem with in-parameters and for providing a test
program. The new in-parameters fix this problem.
- The support for function types (func aType and proc) in interpreter
and compiler has been improved.
- The support for Emscripten (a C compiler that generates JavaScript
and WebAssembly) has been improved. The support of Emscripten is
experimental (see also src/read_me.txt).
- The library http_response.s7i has been improved to set the correct
content-type for more file types (css, javascript, wasm, gif, bmp,
pdf). This way the comanche webserver also works better.
- The function getCgiParameters() in cgi.s7i has been improved to
accept also elements without equals sign (in this case value is
assumed to be "").
- The function readPropertyFile8() has been added to the library
propertyfile.s7i. This function processes an UTF-8 encoded property
file.
- In propertyfile.s7i the function readPropertyNameOrValue() has been
changed to work correct for unicode escapes (\u) and for escaped
newlines. An extended unicode escape (\U) has been added also.
- Testcases that check if seek() does clear the EOF flag have been
added to chkfil.sd7.
- The Seed7 parser (used by interpreter and compiler) has been
improved, to recognize if the same syntax is declared twice. In this
case a compile-time error is written.
- The FAQ has been improved to explain the simple profiling of the
Seed7 compiler.
- The simple profiling of the compiler has been improved to recognize,
if a function has been left without taking profiling into account.
- The compiler has been improved to recognize if a raise statement
leaves a function and generates code to make the profiling work
correct (if it has been enabled).
- The recognition of constant expressions in the compiler has been
improved to consider variable functions as variable. The changes
are in comp/const.s7i in two functions named isConstantCall().
- Changes have been done in seed7_05.s7i and integer.s7i such that the
new in-parameters work as expected.
- The interpreter has been improved to support the actions DCL_IN1,
DCL_IN2, TYP_SET_IN_PARAM_REF and TYP_SET_IN_PARAM_VALUE.
- The functions dcl_in1() and dcl_in2() have been added to dcllib.c.
- The functions typ_set_in_param_ref() and typ_set_in_param_value()
have been added to typlib.c.
- Changes in syntax.c and token.c make sure that the new error
SYNTAX_DECLARED_TWICE is recognized.
- In prclib.c the function prc_cpy() has been improved to take into
account that MATCHOBJECT is constant (and the underlaying object
is variable).
- In cmd_unx.c the function setenv7() has been improved to work
correct, if a value is enlarged.
- In cmd_unx.c the functions getenv7(), setenv7() and unsetenv7() have
been improved to optionally work case insensitive.
- Changes in cmd_drv.h, cmd_rtl.c and fil_unx.c allow that some
operating system properties are determined at run-time. This is used
for Emscripten.
- The functions setenvForNodeJs() and unsetenvForNodeJs() have been
added to cmd_unx.c. Now setenv() and unsetenv() have also an effect
on the environment used by Node.
- The file drw_emc.c has been added. This file provides graphic access
using browser capabilities. It is used if Seed7 is compiled with
emcc.
- The file pre_js.js has been added. This JavaScript code is included
by Emscripten. It sets up program path and arguments, if the program
runs in the browser.
- In cmd_rtl.c the function systemForNodeJs() has been improved to
return -1, if the command cannot be executed.
- The makefiles mk_emccl.mak and mk_emccw.mak have been improved to
store the environment variables in seed7/bin/emcc_env.ini. The macro
CC_ENVIRONMENT_INI, which defines the path of seed7/bin/emcc_env.ini,
is now written to version.h. This way the Seed7 compiler can be used
without setting up Emscripten.
- Changes have been done in error.c and error.h to introduce the new
errors SYNTAX_DECLARED_TWICE and KIND_OF_IN_PARAM_UNDEFINED. The
error UNEXPECTED_SYMBOL has been replaced with EXPECTED_SYMBOL.
- The functions increaseLevelOfCatchedExceptions() and
decreaseLevelOfCatchedExceptions() have been added to comp/error.s7i.
These functions are used in comp/prc_act.s7i.
- In comp/expr.s7i the function declare_type_if_necessary() has been
improved to take a existing typeCategory of BLOCKOBJECT into account.
- In comp/type.s7i the function getExprResultType() has been improved
to check that the category is a CALLOBJECT.
- Definitions of LINKER_OPT_SPECIAL_LIB and SPECIAL_LIB have been added
to cc_conf.s7i.
- The files s7c.sd7, confval.sd7, cmd_rtl.c, mk_emccl.mak and
mk_emccw.mak have been improved to use the new configuration values.
- The parameter list of the functions cmdSetGroup() and cmdSetOwner()
has been changed in comp/cmd_act.s7i, cmd_drv.h, cmd_unx.c and
cmd_win.c. Now group and owner are constant strings.
- Documentation comments have been added or improved in cc_conf.s7i,
cgi.s7i, csv.s7i, propertyfile.s7i and graph.s7i.

Regards,
Thomas Mertes

--
Seed7 Homepage: http://seed7.sourceforge.net
Seed7 - The extensible programming language: User defined statements
and operators, abstract data types, templates without special
syntax, OO with interfaces and multiple dispatch, statically typed,
interpreted or compiled, portable, runs under linux/unix/windows.