543 lines
23 KiB
C
543 lines
23 KiB
C
/*
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* init.c
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*
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* Start up and initialise the environement - just enough to get working
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* and (ultimately) hand off to the executive.
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*
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*
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* (c) 2017 Simon Brooke <simon@journeyman.cc>
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* Licensed under GPL version 2.0, or, at your option, any later version.
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*/
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#include <getopt.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <wchar.h>
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/* libcurl, used for io */
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#include <curl/curl.h>
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#include "arith/peano.h"
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#include "arith/ratio.h"
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#include "debug.h"
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#include "io/fopen.h"
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#include "io/io.h"
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#include "io/print.h"
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#include "memory/conspage.h"
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#include "memory/consspaceobject.h"
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#include "memory/hashmap.h"
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#include "memory/stack.h"
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#include "ops/intern.h"
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#include "ops/lispops.h"
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#include "ops/meta.h"
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#include "repl.h"
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#include "time/psse_time.h"
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#include "version.h"
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/**
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* @brief If `pointer` is an exception, display that exception to stderr,
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* decrement that exception, and return NIL; else return the pointer.
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*
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* @param pointer a cons pointer.
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* @param location_descriptor a description of where the pointer was caught.
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* @return struct cons_pointer
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*/
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struct cons_pointer check_exception( struct cons_pointer pointer,
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char *location_descriptor ) {
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struct cons_pointer result = NIL;
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struct cons_space_object *object = &pointer2cell( pointer );
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if ( exceptionp( pointer ) ) {
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fprintf( stderr, "ERROR: Exception at %s: ", location_descriptor );
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URL_FILE *ustderr = file_to_url_file( stderr );
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fwide( stderr, 1 );
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print( ustderr, object->payload.exception.payload );
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free( ustderr );
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dec_ref( pointer );
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} else {
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result = pointer;
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}
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return result;
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}
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struct cons_pointer init_documentation_symbol = NIL;
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struct cons_pointer init_name_symbol = NIL;
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struct cons_pointer init_primitive_symbol = NIL;
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void maybe_bind_init_symbols( ) {
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if ( nilp( init_documentation_symbol ) ) {
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init_documentation_symbol =
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c_string_to_lisp_keyword( L"documentation" );
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}
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if ( nilp( init_name_symbol ) ) {
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init_name_symbol = c_string_to_lisp_keyword( L"name" );
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}
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if ( nilp( init_primitive_symbol ) ) {
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init_primitive_symbol = c_string_to_lisp_keyword( L"primitive" );
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}
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if ( nilp( privileged_symbol_nil ) ) {
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privileged_symbol_nil = c_string_to_lisp_symbol( L"nil" );
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}
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if ( nilp( privileged_string_memory_exhausted ) ) {
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// we can't make this string when we need it, because memory is then
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// exhausted!
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privileged_string_memory_exhausted =
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c_string_to_lisp_string( L"Memory exhausted." );
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}
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}
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void free_init_symbols( ) {
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dec_ref( init_documentation_symbol );
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dec_ref( init_name_symbol );
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dec_ref( init_primitive_symbol );
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}
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/**
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* Bind this compiled `executable` function, as a Lisp function, to
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* this name in the `oblist`.
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* \todo where a function is not compiled from source, we could cache
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* the name on the source pointer. Would make stack frames potentially
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* more readable and aid debugging generally.
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*/
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struct cons_pointer bind_function( wchar_t *name,
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wchar_t *doc,
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struct cons_pointer ( *executable )
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( struct stack_frame *,
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struct cons_pointer,
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struct cons_pointer ) ) {
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struct cons_pointer n = c_string_to_lisp_symbol( name );
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struct cons_pointer d = c_string_to_lisp_string( doc );
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struct cons_pointer meta =
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make_cons( make_cons( init_primitive_symbol, TRUE ),
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make_cons( make_cons( init_name_symbol, n ),
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make_cons( make_cons
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( init_documentation_symbol, d ),
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NIL ) ) );
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struct cons_pointer r =
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check_exception( deep_bind( n, make_function( meta, executable ) ),
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"bind_function" );
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dec_ref( n );
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dec_ref( d );
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return r;
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}
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/**
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* Bind this compiled `executable` function, as a Lisp special form, to
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* this `name` in the `oblist`.
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*/
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struct cons_pointer bind_special( wchar_t *name,
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wchar_t *doc,
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struct cons_pointer ( *executable )
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( struct stack_frame *, struct cons_pointer,
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struct cons_pointer ) ) {
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struct cons_pointer n = c_string_to_lisp_symbol( name );
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struct cons_pointer d = c_string_to_lisp_string( doc );
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struct cons_pointer meta =
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make_cons( make_cons( init_primitive_symbol, TRUE ),
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make_cons( make_cons( init_name_symbol, n ),
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make_cons( make_cons
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( init_documentation_symbol, d ),
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NIL ) ) );
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struct cons_pointer r =
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check_exception( deep_bind( n, make_special( meta, executable ) ),
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"bind_special" );
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dec_ref( n );
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dec_ref( d );
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return r;
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}
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/**
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* Bind this `value` to this `symbol` in the `oblist`.
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*/
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struct cons_pointer
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bind_symbol_value( struct cons_pointer symbol, struct cons_pointer value,
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bool lock ) {
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struct cons_pointer r = check_exception( deep_bind( symbol, value ),
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"bind_symbol_value" );
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if ( lock && !exceptionp( r ) ) {
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struct cons_space_object *cell = &pointer2cell( r );
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cell->count = UINT32_MAX;
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}
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return r;
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}
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/**
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* Bind this `value` to this `name` in the `oblist`.
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*/
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struct cons_pointer bind_value( wchar_t *name, struct cons_pointer value,
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bool lock ) {
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struct cons_pointer p = c_string_to_lisp_symbol( name );
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struct cons_pointer r = bind_symbol_value( p, value, lock );
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dec_ref( p );
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return r;
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}
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void print_banner( ) {
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fwprintf( stdout, L"Post-Scarcity Software Environment version %s\n\n",
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VERSION );
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}
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/**
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* Print command line options to this `stream`.
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*
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* @stream the stream to print to.
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*/
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void print_options( FILE *stream ) {
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fwprintf( stream, L"Expected options are:\n" );
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fwprintf( stream,
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L"\t-d\tDump memory to standard out at end of run (copious!);\n" );
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fwprintf( stream, L"\t-h\tPrint this message and exit;\n" );
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fwprintf( stream, L"\t-p\tShow a prompt (default is no prompt);\n" );
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#ifdef DEBUG
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fwprintf( stream,
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L"\t-v LEVEL\n\t\tSet verbosity to the specified level (0...512)\n" );
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fwprintf( stream, L"\t\tWhere bits are interpreted as follows:\n" );
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fwprintf( stream, L"\t\t1\tALLOC;\n" );
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fwprintf( stream, L"\t\t2\tARITH;\n" );
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fwprintf( stream, L"\t\t4\tBIND;\n" );
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fwprintf( stream, L"\t\t8\tBOOTSTRAP;\n" );
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fwprintf( stream, L"\t\t16\tEVAL;\n" );
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fwprintf( stream, L"\t\t32\tINPUT/OUTPUT;\n" );
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fwprintf( stream, L"\t\t64\tLAMBDA;\n" );
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fwprintf( stream, L"\t\t128\tREPL;\n" );
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fwprintf( stream, L"\t\t256\tSTACK.\n" );
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#endif
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}
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/**
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* main entry point; parse command line arguments, initialise the environment,
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* and enter the read-eval-print loop.
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*/
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int main( int argc, char *argv[] ) {
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int option;
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bool dump_at_end = false;
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bool show_prompt = false;
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char *infilename = NULL;
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setlocale( LC_ALL, "" );
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if ( io_init( ) != 0 ) {
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fputs( "Failed to initialise I/O subsystem\n", stderr );
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exit( 1 );
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}
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while ( ( option = getopt( argc, argv, "phdv:i:" ) ) != -1 ) {
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switch ( option ) {
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case 'd':
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dump_at_end = true;
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break;
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case 'h':
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print_banner( );
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print_options( stdout );
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exit( 0 );
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break;
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case 'i':
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infilename = optarg;
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break;
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case 'p':
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show_prompt = true;
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break;
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case 'v':
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verbosity = atoi( optarg );
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break;
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default:
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fwprintf( stderr, L"Unexpected option %c\n", option );
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print_options( stderr );
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exit( 1 );
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break;
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}
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}
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initialise_cons_pages( );
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maybe_bind_init_symbols( );
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if ( show_prompt ) {
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print_banner( );
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}
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debug_print( L"About to initialise oblist\n", DEBUG_BOOTSTRAP );
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oblist = make_hashmap( 32, NIL, TRUE );
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debug_print( L"About to bind\n", DEBUG_BOOTSTRAP );
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/*
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* privileged variables (keywords)
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*/
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bind_symbol_value( privileged_symbol_nil, NIL, true );
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bind_value( L"t", TRUE, true );
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/*
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* standard input, output, error and sink streams
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* attempt to set wide character acceptance on all streams
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*/
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URL_FILE *sink = url_fopen( "/dev/null", "w" );
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fwide( stdin, 1 );
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fwide( stdout, 1 );
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fwide( stderr, 1 );
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fwide( sink->handle.file, 1 );
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FILE *infile = infilename == NULL ? stdin : fopen( infilename, "r" );
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lisp_io_in =
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bind_value( C_IO_IN,
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make_read_stream( file_to_url_file( infile ),
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make_cons( make_cons
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( c_string_to_lisp_keyword
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( L"url" ),
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c_string_to_lisp_string
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( L"system:standard input" ) ),
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NIL ) ), false );
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lisp_io_out =
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bind_value( C_IO_OUT,
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make_write_stream( file_to_url_file( stdout ),
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make_cons( make_cons
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( c_string_to_lisp_keyword
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( L"url" ),
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c_string_to_lisp_string
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( L"system:standard output]" ) ),
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NIL ) ), false );
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bind_value( L"*log*",
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make_write_stream( file_to_url_file( stderr ),
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make_cons( make_cons
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( c_string_to_lisp_keyword
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( L"url" ),
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c_string_to_lisp_string
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( L"system:standard log" ) ),
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NIL ) ), false );
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bind_value( L"*sink*",
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make_write_stream( sink,
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make_cons( make_cons
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( c_string_to_lisp_keyword
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( L"url" ),
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c_string_to_lisp_string
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( L"system:standard sink" ) ),
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NIL ) ), false );
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/*
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* the default prompt
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*/
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prompt_name = bind_value( L"*prompt*",
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show_prompt ? c_string_to_lisp_symbol( L":: " ) :
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NIL, false );
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/*
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* primitive function operations
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*/
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/* TODO: docstrings should be moved to a header file, or even to an at-run-time resolution system.
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* HTTP from an address at journeyman? */
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bind_function( L"absolute",
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L"`(absolute arg)`: If `arg` is a number, return the absolute value of that number, else `nil`.",
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&lisp_absolute );
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bind_function( L"add",
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L"`(+ args...)`: If `args` are all numbers, return the sum of those numbers.",
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&lisp_add );
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bind_function( L"and",
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L"`(and args...)`: Return a logical `and` of all the arguments and return `t` only if all are truthy, else `nil`.",
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&lisp_and );
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bind_function( L"append",
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L"`(append args...)`: If args are all collections, return the concatenation of those collections.",
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&lisp_append );
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bind_function( L"apply",
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L"`(apply f args)`: If `f` is usable as a function, and `args` is a collection, apply `f` to `args` and return the value.",
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&lisp_apply );
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bind_function( L"assoc",
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L"`(assoc key store)`: Return the value associated with this `key` in this `store`.",
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&lisp_assoc );
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bind_function( L"car",
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L"`(car arg)`: If `arg` is a sequence, return the item which is the head of that sequence.",
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&lisp_car );
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bind_function( L"cdr",
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L"`(cdr arg)`: If `arg` is a sequence, return the remainder of that sequence with the first item removed.",
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&lisp_cdr );
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bind_function( L"close",
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L"`(close stream)`: If `stream` is a stream, close that stream.",
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&lisp_close );
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bind_function( L"cons",
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L"`(cons a b)`: Return a cons cell whose `car` is `a` and whose `cdr` is `b`.",
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&lisp_cons );
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bind_function( L"count",
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L"`(count s)`: Return the number of items in the sequence `s`.",
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&lisp_count );
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bind_function( L"divide",
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L"`(/ a b)`: If `a` and `b` are both numbers, return the numeric result of dividing `a` by `b`.",
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&lisp_divide );
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bind_function( L"eq?",
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L"`(eq? args...)`: Return `t` if all args are the exact same object, else `nil`.",
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&lisp_eq );
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bind_function( L"equal?",
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L"`(equal? args...)`: Return `t` if all args have logically equivalent value, else `nil`.",
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&lisp_equal );
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bind_function( L"eval", L"", &lisp_eval );
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bind_function( L"exception",
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L"`(exception message)`: Return (throw) an exception with this `message`.",
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&lisp_exception );
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bind_function( L"get-hash",
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L"`(get-hash arg)`: returns the natural number hash value of `arg`.",
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&lisp_get_hash );
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bind_function( L"hashmap",
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L"`(hashmap n-buckets hashfn store acl)`: Return a new hashmap, with `n-buckets` buckets and this `hashfn`, containing the content of this `store`.",
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lisp_make_hashmap );
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bind_function( L"inspect",
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L"`(inspect object ouput-stream)`: Print details of this `object` to this `output-stream` or `*out*`.",
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&lisp_inspect );
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bind_function( L"keys",
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L"`(keys store)`: Return a list of all keys in this `store`.",
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&lisp_keys );
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bind_function( L"list", L"`(list args...): Return a list of these `args`.",
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&lisp_list );
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bind_function( L"mapcar",
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L"`(mapcar function sequence)`: Apply `function` to each element of `sequence` in turn, and return a sequence of the results.",
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&lisp_mapcar );
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bind_function( L"meta",
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L"`(meta symbol)`: If the binding of `symbol` has metadata, return that metadata, else `nil`.",
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&lisp_metadata );
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bind_function( L"metadata",
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L"`(metadata symbol)`: If the binding of `symbol` has metadata, return that metadata, else `nil`.",
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&lisp_metadata );
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bind_function( L"multiply",
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L"`(* args...)` Multiply these `args`, all of which should be numbers.",
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&lisp_multiply );
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bind_function( L"negative?",
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L"`(negative? n)`: Return `t` if `n` is a negative number, else `nil`.",
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&lisp_is_negative );
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bind_function( L"not",
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L"`(not arg)`: Return`t` only if `arg` is `nil`, else `nil`.",
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&lisp_not );
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bind_function( L"oblist",
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L"`(oblist)`: Return the current symbol bindings, as a map.",
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&lisp_oblist );
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bind_function( L"open",
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L"`(open url write?)`: Open a stream to this `url`. If `write?` is present and is non-nil, open it for writing, else reading.",
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&lisp_open );
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bind_function( L"or",
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L"`(or args...)`: Return a logical `or` of all the arguments and return `t` if any is truthy, else `nil`.",
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&lisp_or );
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bind_function( L"print",
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L"`(print object stream)`: Print `object` to `stream`, if specified, else to `*out*`.",
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&lisp_print );
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bind_function( L"println",
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L"`(println stream)`: Print a new line character to `stream`, if specified, else to `*out*`.",
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&lisp_print );
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bind_function( L"put!", L"", lisp_hashmap_put );
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bind_function( L"put-all!",
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L"`(put-all! dest source)`: If `dest` is a namespace and is writable, copies all key-value pairs from `source` into `dest`.",
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&lisp_hashmap_put_all );
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bind_function( L"ratio->real",
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L"`(ratio->real r)`: If `r` is a rational number, return the real number equivalent.",
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&lisp_ratio_to_real );
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bind_function( L"read",
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L"`(read stream)`: read one complete lisp form and return it. If `stream` is specified and is a read stream, then read from that stream, else the stream which is the value of `*in*` in the environment.",
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&lisp_read );
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bind_function( L"read-char",
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L"`(read-char stream)`: Return the next character. If `stream` is specified and is a read stream, then read from that stream, else the stream which is the value of `*in*` in the environment.",
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&lisp_read_char );
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bind_function( L"repl",
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L"`(repl prompt input output)`: Starts a new read-eval-print-loop. All arguments are optional.",
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&lisp_repl );
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bind_function( L"reverse",
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L"`(reverse sequence)` Returns a sequence of the top level elements of this `sequence`, which may be a list or a string, in the reverse order.",
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&lisp_reverse );
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bind_function( L"set", L"", &lisp_set );
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bind_function( L"slurp",
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L"`(slurp read-stream)` Read all the characters from `read-stream` to the end of stream, and return them as a string.",
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&lisp_slurp );
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bind_function( L"source",
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L"`(source object)`: If `object` is an interpreted function or interpreted special form, returns the source code; else nil.",
|
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&lisp_source );
|
||
bind_function( L"subtract",
|
||
L"`(- a b)`: Subtracts `b` from `a` and returns the result. Expects both arguments to be numbers.",
|
||
&lisp_subtract );
|
||
bind_function( L"throw", L"", &lisp_exception );
|
||
bind_function( L"time",
|
||
L"`(time arg)`: Return a time object. If an `arg` is supplied, it should be an integer which will be interpreted as a number of microseconds since the big bang, which is assumed to have happened 441,806,400,000,000,000 seconds before the UNIX epoch.",
|
||
&lisp_time );
|
||
bind_function( L"type",
|
||
L"`(type object)`: returns the type of the specified `object`. Currently (0.0.6) the type is returned as a four character string; this may change.",
|
||
&lisp_type );
|
||
bind_function( L"+",
|
||
L"`(+ args...)`: If `args` are all numbers, return the sum of those numbers.",
|
||
&lisp_add );
|
||
bind_function( L"*",
|
||
L"`(* args...)` Multiply these `args`, all of which should be numbers.",
|
||
&lisp_multiply );
|
||
bind_function( L"-",
|
||
L"`(- a b)`: Subtracts `b` from `a` and returns the result. Expects both arguments to be numbers.",
|
||
&lisp_subtract );
|
||
bind_function( L"/",
|
||
L"`(/ a b)`: If `a` and `b` are both numbers, return the numeric result of dividing `a` by `b`.",
|
||
&lisp_divide );
|
||
bind_function( L"=",
|
||
L"`(equal? args...)`: Return `t` if all args have logically equivalent value, else `nil`.",
|
||
&lisp_equal );
|
||
/*
|
||
* primitive special forms
|
||
*/
|
||
bind_special( L"cond",
|
||
L"`(cond clauses...)`: Conditional evaluation, `clauses` is a sequence of lists of forms such that if evaluating the first form in any clause returns non-`nil`, the subsequent forms in that clause will be evaluated and the value of the last returned; but any subsequent clauses will not be evaluated.",
|
||
&lisp_cond );
|
||
bind_special( L"lambda",
|
||
L"`(lambda arg-list forms...)`: Construct an interpretable λ funtion.",
|
||
&lisp_lambda );
|
||
bind_special( L"\u03bb", L"", &lisp_lambda ); // λ
|
||
bind_special( L"let",
|
||
L"`(let bindings forms)`: Bind these `bindings`, which should be specified as an association list, into the local environment and evaluate these forms sequentially in that context, returning the value of the last.",
|
||
&lisp_let );
|
||
bind_special( L"nlambda",
|
||
L"`(nlamda arg-list forms...)`: Construct an interpretable special form. When the form is interpreted, arguments specified in the `arg-list` will not be evaluated.",
|
||
&lisp_nlambda );
|
||
bind_special( L"n\u03bb", L"`(nlamda arg-list forms...)`: Construct an interpretable special form. When the form is interpreted, arguments specified in the `arg-list` will not be evaluated.", &lisp_nlambda ); // nλ
|
||
bind_special( L"progn",
|
||
L"`(progn forms...)` Evaluate `forms` sequentially, and return the value of the last.",
|
||
&lisp_progn );
|
||
bind_special( L"quote",
|
||
L"`(quote form)`: Returns `form`, unevaluated. More idiomatically expressed `'form`, where the quote mark is a reader macro which is expanded to `(quote form)`.",
|
||
&lisp_quote );
|
||
bind_special( L"set!",
|
||
L"`(set! symbol value namespace)`: Binds `symbol` in `namespace` to the value of `value`, altering the namespace in so doing, and returns `value`. If `namespace` is not specified, it defaults to the default namespace.",
|
||
&lisp_set_shriek );
|
||
bind_special( L"try", L"", &lisp_try );
|
||
debug_print( L"Initialised oblist\n", DEBUG_BOOTSTRAP );
|
||
debug_dump_object( oblist, DEBUG_BOOTSTRAP );
|
||
|
||
repl( show_prompt );
|
||
|
||
debug_dump_object( oblist, DEBUG_BOOTSTRAP );
|
||
|
||
debug_print( L"Freeing oblist\n", DEBUG_BOOTSTRAP );
|
||
while ( ( pointer2cell( oblist ) ).count > 0 ) {
|
||
fprintf( stderr, "Dangling refs on oblist: %d\n",
|
||
( pointer2cell( oblist ) ).count );
|
||
dec_ref( oblist );
|
||
}
|
||
|
||
free_init_symbols( );
|
||
|
||
if ( dump_at_end ) {
|
||
dump_pages( file_to_url_file( stdout ) );
|
||
}
|
||
|
||
summarise_allocation( );
|
||
curl_global_cleanup( );
|
||
return ( 0 );
|
||
}
|