193 lines
2.7 KiB
C++
193 lines
2.7 KiB
C++
#include "stdafx.h"
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#include "defs.h"
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jmp_buf stop_return, draw_stop_return;
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void
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stop(char *s)
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{
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if (draw_flag == 2)
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longjmp(draw_stop_return, 1);
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else {
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printstr("Stop: ");
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printstr(s);
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printstr(" ");
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longjmp(stop_return, 1);
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}
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}
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void
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run(char *s)
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{
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int i, n;
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/*if (strncmp(s, "selftest", 8) == 0) {
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selftest();
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return;
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}*/
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if (setjmp(stop_return))
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return;
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init();
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while (1) {
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n = scan(s);
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p1 = pop();
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check_stack();
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if (n == 0)
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break;
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// if debug mode then print the source text
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if (equaln(get_binding(symbol(TRACE)), 1)) {
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for (i = 0; i < n; i++)
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if (s[i] != ' ')
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printchar(s[i]);
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if (s[n - 1] != ' ') // n is not zero, see above
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printchar(' ');
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}
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s += n;
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push(p1);
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top_level_eval();
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p2 = pop();
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check_stack();
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if (p2 == symbol(NIL))
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continue;
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// print string w/o quotes
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if (isstr(p2)) {
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printstr(p2->u.str);
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printstr(" ");
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continue;
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}
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if (equaln(get_binding(symbol(TTY)), 1) || test_flag) // tty mode?
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printline(p2);
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else {
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//#ifdef LINUX
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display(p2);
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/*#else
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push(p2);
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cmdisplay();
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#endif*/
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}
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}
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}
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void
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check_stack(void)
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{
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if (tos != 0)
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stop("stack error");
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if (frame != stack + TOS)
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stop("frame error");
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}
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// cannot reference symbols yet
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void
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echo_input(char *s)
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{
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printstr(s);
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printstr(" ");
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}
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// returns nil on stack if no result to print
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void
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top_level_eval(void)
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{
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save();
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trigmode = 0;
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p1 = symbol(AUTOEXPAND);
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if (iszero(get_binding(p1)))
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expanding = 0;
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else
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expanding = 1;
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p1 = pop();
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push(p1);
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eval();
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p2 = pop();
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// "draw", "for" and "setq" return "nil", there is no result to print
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if (p2 == symbol(NIL)) {
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push(p2);
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restore();
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return;
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}
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// update "last"
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set_binding(symbol(LAST), p2);
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if (!iszero(get_binding(symbol(BAKE)))) {
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push(p2);
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bake();
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p2 = pop();
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}
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// If we evaluated the symbol "i" or "j" and the result was sqrt(-1)
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// then don't do anything.
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// Otherwise if "j" is an imaginary unit then subst.
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// Otherwise if "i" is an imaginary unit then subst.
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if ((p1 == symbol(SYMBOL_I) || p1 == symbol(SYMBOL_J))
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&& isimaginaryunit(p2))
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;
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else if (isimaginaryunit(get_binding(symbol(SYMBOL_J)))) {
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push(p2);
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push(imaginaryunit);
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push_symbol(SYMBOL_J);
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subst();
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p2 = pop();
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} else if (isimaginaryunit(get_binding(symbol(SYMBOL_I)))) {
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push(p2);
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push(imaginaryunit);
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push_symbol(SYMBOL_I);
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subst();
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p2 = pop();
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}
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#ifndef LINUX
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// if we evaluated the symbol "a" and got "b" then print "a=b"
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// do not print "a=a"
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if (issymbol(p1) && !iskeyword(p1) && p1 != p2 && test_flag == 0) {
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push_symbol(SETQ);
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push(p1);
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push(p2);
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list(3);
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p2 = pop();
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}
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#endif
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push(p2);
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restore();
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}
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void
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check_esc_flag(void)
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{
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if (esc_flag)
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stop("esc key");
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}
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