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#include <u.h>
#include <libc.h>
#include <bio.h>
#include "dat.h"
#include "fns.h"
Rune *prettyprintlist(Term *, Rune *, int, int, int, int, Module *);
Rune *printlist(Term *, int, int, int, Module *);
int islist(Term *);
int needsquotes(Rune *);
Rune *
prettyprint(Term *t, int quoted, int ignoreops, int numbervars, Module *mod)
{
Rune *result;
Rune *args;
if(mod == nil)
mod = usermodule;
switch(t->tag){
case CompoundTerm:
if(numbervars && t->arity == 1
&& t->children->tag == IntegerTerm
&& t->children->ival >= 0
&& runestrcmp(t->text, L"$VAR") == 0){
vlong n = t->children->ival;
Rune i = L'A' + (n % 26);
vlong j = n / 26;
if(j == 0)
result = runesmprint("%C", i);
else
result = runesmprint("%C%lld", i, j);
break;
}
args = printlist(t, quoted, ignoreops, numbervars, mod);
if(args && !ignoreops){
result = runesmprint("[%S]", args);
free(args);
break;
}
Operator *op = getoperator(t->text, mod);
if(op == nil || ignoreops || !(t->arity == 1 || t->arity == 2)){
Rune *functor = prettyprint(mkatom(t->text), quoted, ignoreops, numbervars, mod);
args = prettyprintlist(t->children, L", ", 0, quoted, ignoreops, numbervars, mod);
result = runesmprint("%S(%S)", functor, args);
free(functor);
free(args);
break;
}else{
/* TODO:
1) Only print spacing between op and args when needed
2) currectly add () around args in special cases (see 7.10.5.h.2 in spec)
*/
Rune *functor = prettyprint(mkatom(t->text), quoted, ignoreops, numbervars, mod);
Rune *arg1 = prettyprint(t->children, quoted, ignoreops, numbervars, mod);
Rune *arg2 = t->arity == 2 ? prettyprint(t->children->next, quoted, ignoreops, numbervars, mod) : nil;
if(t->arity == 2)
result = runesmprint("%S %S %S", arg1, functor, arg2);
else{
if(op->type == Xf || op->type == Yf)
result = runesmprint("%S %S", arg1, functor);
else
result = runesmprint("%S %S", functor, arg1);
}
free(functor);
free(arg1);
free(arg2);
}
break;
case AtomTerm:
if(quoted && needsquotes(t->text))
result = runesmprint("'%S'", t->text);
else
result = runesmprint("%S", t->text);
break;
case VariableTerm:
result = runesmprint("_%S", t->text);
break;
case FloatTerm:
result = runesmprint("%f", t->dval);
break;
case IntegerTerm:
result = runesmprint("%lld", t->ival);
break;
default:
result = runesmprint("cant print term with tag %d", t->tag);
break;
}
return result;
}
Rune *
prettyprintlist(Term *t, Rune *sep, int end, int quoted, int ignoreops, int numbervars, Module *mod)
{
if(t == nil){
if(end)
return runesmprint("%S", sep);
else
return runesmprint("");
}
Rune *str = prettyprint(t, quoted, ignoreops, numbervars, mod);
Rune *rest = prettyprintlist(t->next, sep, end, quoted, ignoreops, numbervars, mod);
Rune *result;
if(t->next != nil)
result = runesmprint("%S%S%S", str, sep, rest);
else
result = runesmprint("%S%S", str, end ? rest : L"");
free(str);
free(rest);
return result;
}
/* printlist prints a list's elements but not the surrounding [ and ] */
Rune *
printlist(Term *list, int quoted, int ignoreops, int numbervars, Module *mod)
{
if(list->tag != CompoundTerm || list->arity != 2 || runestrcmp(L".", list->text) != 0)
return nil;
Term *head = list->children;
Term *tail = head->next;
Rune *headstr = prettyprint(head, quoted, ignoreops, numbervars, mod);
Rune *tailstr = nil;
Rune *result;
if(tail->tag == CompoundTerm && tail->arity == 2 && runestrcmp(L".", tail->text) == 0){
tailstr = printlist(tail, quoted, ignoreops, numbervars, mod);
result = runesmprint("%S, %S", headstr, tailstr);
}else if(tail->tag == AtomTerm && runestrcmp(L"[]", tail->text) == 0){
result = runesmprint("%S", headstr);
}else{
tailstr = prettyprint(tail, quoted, ignoreops, numbervars, mod);
result = runesmprint("%S | %S", headstr, tailstr);
}
free(headstr);
free(tailstr);
return result;
}
int
needsquotes(Rune *text)
{
Rune *graphics = L"#$&*+-./:<=>?@^~\\"; /* keep in sync with lexer */
int len = runestrlen(text);
int i;
if(runestrcmp(text, L"") == 0)
return 1;
if(runestrchr(graphics, text[0])){
for(i = 0; i < len; i++){
if(!runestrchr(graphics, text[i]))
return 1;
}
return 0;
}
if(len == 1 && runestrchr(L";!,", text[0]))
return 0;
if(len > 0 && !islowerrune(text[0]))
return 1;
for(i = 0; i < len; i++)
if(!isalpharune(text[i]))
return 1;
return 0;
}
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