static void parsename(void)
{
if(strcmp(tokenval, "-") == 0)
push(gettemplate("neg"));
else if(strcmp(tokenval, "num") == 0)
makeconstant(MATCHTYPE, INT);
else if(strcmp(tokenval, "bool") == 0)
makeconstant(MATCHTYPE, BOOLEAN);
else if(strcmp(tokenval, "char") == 0)
makeconstant(MATCHTYPE, CHAR);
else
push(gettemplate(tokenval));
gettoken();
}
static void applyDIVIDE(void)
{
Real x = evalreal(getN(1)), y = evalreal(getN(2));
if(y==0)
makeconstant(ERROR, template_divide->value);
else
makeREAL(x/y);
}
static void applyMOD(void)
{
Integer x = evalint(getN(1), template_mod->value);
Integer y = evalint(getN(2), template_mod->value);
if(y==0)
makeconstant(ERROR, template_mod->value);
else
makeINT(x%y);
}
static void applyDIV(void)
{
Integer x = evalint(getN(1), template_div->value);
Integer y = evalint(getN(2), template_div->value);
if(y==0)
makeconstant(ERROR, template_div->value);
else
makeINT(x/y);
}
static void buildstring(char *s)
{
int count = 0;
for(;*s != '\0'; s++)
{
makeconstant(CHAR, *s);
count++;
}
push(template_nil);
while(count-->0) makeinverse(LIST);
}
static void parsetypesynonym(void)
{
Cell *head = pop();
setchecktypevariables(COLLECT);
push(template_match);
for(; head->tag==APPLY; head=head->left)
{
if(head->right->tag != UNDEFINED && head->right->tag != FUNC) parseerror(9);
push(maketypevariable(getfunction(head->right->value)->name));
make(STRUCT);
}
if(head->tag != UNDEFINED && head->tag != FUNC) parseerror(10);
makeconstant(FUNC, head->value);
make(STRUCT);
setchecktypevariables(CHECK);
gettoken();
parsetype(TYPEEXPR);
makeinverse(TYPESYNONYM);
if(!inserttypeexpr(getfunction(head->value)->name, pop())) parseerror(12);
setchecktypevariables(NOCHECK);
}
/********************************************************************
initialisation of hashtable with system functions
*********************************************************************/
static void initsyslib(void)
{
Cell *obj = gettemplate("objecttype");
inserttypestring("object", "[char] -> objecttype");
insertabstype("object", obj);
parsetypeexpr("(*, [char] -> [[char]] -> * -> (*, [[char]]))");
makeconstant(FUNC, obj->value);
makecompound(STRUCT, 1);
make(TYPESYNONYM);
inserttypeexpr("objecttype", pop());
insertabstype("objecttype", obj);
insert("_section", 3, FUNC , NULL, apply_SECTION);
insert("if" , 3, FUNC , NULL, applyIF);
insert("^" , 2, FUNC , NULL, applyPOWER);
insert("neg" , 1, FUNC , NULL, applyNEG);
insert("*" , 2, FUNC , NULL, applyTIMES);
insert("/" , 2, FUNC , NULL, applyDIV);
insert("//" , 2, FUNC , NULL, applyDIVIDE);
insert("%" , 2, FUNC , NULL, applyMOD);
insert("+" , 2, FUNC , NULL, applyPLUS);
insert("-" , 2, FUNC , NULL, applyMINUS);
insert("=" , 2, FUNC , NULL, applyEQ);
insert("~=" , 2, FUNC , NULL, applyNE);
insert("<" , 2, FUNC , NULL, applyLT);
insert("<=" , 2, FUNC , NULL, applyLE);
insert(">" , 2, FUNC , NULL, applyGT);
insert(">=" , 2, FUNC , NULL, applyGE);
insert("&" , 2, FUNC , NULL, applyUPDATE);
insert("True" , 0, BOOLEAN , NULL, NULL);
insert("False" , 0, BOOLEAN , NULL, NULL);
insert("pi" , 0, REAL , NULL, NULL);
insert("Nil" , 0, NIL , NULL, NULL);
insert("" , 1, FUNC , NULL, NULL);
insert("strict" , 2, FUNC , NULL, applySTRICT);
inserttypestring("_section" , "(* -> ** -> ***) -> ** -> * -> ***");
inserttypestring("if" , "bool -> * -> * -> *");
inserttypestring("^" , "num -> num -> num");
inserttypestring("neg" , "num -> num");
inserttypestring("*" , "num -> num -> num");
inserttypestring("/" , "num -> num -> num");
inserttypestring("//" , "num -> num -> num");
inserttypestring("%" , "num -> num -> num");
inserttypestring("+" , "num -> num -> num");
inserttypestring("-" , "num -> num -> num");
inserttypestring("=" , "* -> * -> bool");
inserttypestring("~=" , "* -> * -> bool");
inserttypestring("<" , "* -> * -> bool");
inserttypestring("<=" , "* -> * -> bool");
inserttypestring(">" , "* -> * -> bool");
inserttypestring(">=" , "* -> * -> bool");
inserttypestring("&" , "* -> * -> *");
inserttypestring("True" , "bool");
inserttypestring("False" , "bool");
inserttypestring("pi" , "num");
inserttypestring("Nil" , "[*]");
inserttypestring("strict" , "(* -> **) -> * -> **");
insertsys("strict");
insertsys("^");
insertsys("neg");
insertsys("*");
insertsys("/");
insertsys("//");
insertsys("%");
insertsys("+");
insertsys("-");
insertsys("=");
insertsys("~=");
insertsys("<");
insertsys("<=");
insertsys(">");
insertsys(">=");
insertoperator("." , 1, Right);
insertoperator(":" , 1, Right);
insertoperator("&" , 1, Left);
insertoperator("!" , 2, Left);
insertoperator("^" , 2, Right);
insertoperator("*" , 3, Left);
insertoperator("/" , 3, Left);
insertoperator("//" , 3, Left);
insertoperator("%" , 3, Left);
insertoperator("++" , 4, Right);
insertoperator("--" , 4, Left);
insertoperator("+" , 4, Left);
insertoperator("-" , 4, Left);
insertoperator("=" , 5, Right);
insertoperator("~=" , 5, Left);
insertoperator("<" , 5, Left);
insertoperator("<=" , 5, Left);
insertoperator(">" , 5, Left);
insertoperator(">=" , 5, Left);
insertoperator("/\\" , 6, Right);
insertoperator("\\/" , 7, Right);
template_divide = gettemplate("//");
template_div = gettemplate("/");
template_mod = gettemplate("%");
template_power = gettemplate("^");
template_update = gettemplate("&");
}
static void parsestructdef(void)
{
char structname[stringsize];
char *headname;
int count;
Cell *head = pop();
setchecktypevariables(COLLECT);
push(template_match);
for(; head->tag==APPLY; head=head->left)
{
if(head->right->tag != UNDEFINED && head->right->tag != FUNC) parseerror(9);
push(maketypevariable(getfunction(head->right->value)->name));
make(STRUCT);
}
if(head->tag != UNDEFINED && head->tag != FUNC) parseerror(10);
headname = getfunction(head->value)->name;
makeconstant(FUNC, head->value);
make(STRUCT);
setchecktypevariables(CHECK);
gettoken();
head = top();
if(tokentype == LACC)
{
count = 0;
do
{
gettoken();
if(tokentype != IDENTIFIER) parseerror(25);
push(gettemplate(tokenval));
gettoken();
if(tokentype != COLONS) parseerror(15);
gettoken();
parsetype(TYPEEXPR);
makerecordfield(head, getN(2), getN(1));
makeinverse(TYPEDEF);
count++;
}
while(tokentype == COMMA);
makecompound(RECORD, count);
makeinverse(TYPEDEF);
if(tokentype != RACC) parseerror(33);
gettoken();
}
else
{
for(;;)
{
if(tokentype != TYPEID) parseerror(11);
strcpy(structname, tokenval);
count = 0;
gettoken();
while(tokentype == IDENTIFIER
|| tokentype == OPERATOR
|| tokentype == LBRACK
|| tokentype == LPAR)
{
parsetype(TYPETERM);
count++;
}
push(head);
while(count-- > 0) makeinverse(APPLY);
if(!inserttypeexpr(structname, pop())) parseerror(12);
if(tokentype != BAR) break;
gettoken();
}
}
if(!inserttypeexpr(headname, pop())) parseerror(12);
setchecktypevariables(NOCHECK);
}
static void parseterm(void)
{
int count;
switch(tokentype)
{
case NUMBER:
if(strchr(tokenval, '.') == NULL)
makeINT(atol(tokenval));
else
makeREAL(atof(tokenval));
gettoken();
break;
case IDENTIFIER:
parsename();
break;
case TYPEID:
push(gettemplate(tokenval));
makecompound(STRUCT, 1);
gettoken();
break;
case CHARACTER:
makeconstant(CHAR, tokenval[0]);
gettoken();
break;
case STRING:
buildstring(tokenval);
gettoken();
break;
case LPAR:
gettoken();
if(tokentype == OPERATOR && strcmp(tokenval, "-") != 0)
{
parsename();
if(tokentype != RPAR)
{
parseexpression(MAXPRIO);
rotatestack();
push(gettemplate("_section"));
make(APPLY);
make(APPLY);
}
}
else if(tokentype == RPAR)
makeconstant(NULLTUPLE, 0);
else
{
parseexpression(MAXPRIO);
if(tokentype == COMMA)
{
count = 1;
while(tokentype == COMMA)
{
gettoken();
parseexpression(MAXPRIO);
count++;
}
makecompound(PAIR, count);
}
}
if(tokentype != RPAR) parseerror(2);
gettoken();
break;
case LBRACK:
parselist();
break;
case LACC:
count = 0;
do
{
gettoken();
if(tokentype != IDENTIFIER) parseerror(25);
push(gettemplate(tokenval));
gettoken();
if(strcmp(tokenval, "=") != 0) parseerror(5);
gettoken();
parseexpression(MAXPRIO);
makeinverse(ALIAS);
count++;
}
while(tokentype == COMMA);
makecompound(RECORD, count);
if(tokentype != RACC) parseerror(33);
gettoken();
break;
default:
parseerror(3);
}
}
