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|
/* l2xistd.c LTX2X interpreter Parsing for calls to standard functions */
/* Written by: Peter Wilson, CUA pwilson@cme.nist.gov */
/* This code is partly based on algorithms presented by Ronald Mak in */
/* "Writing Compilers & Interpreters", John Wiley & Sons, 1991 */
#include <stdio.h>
#include "l2xicmon.h"
#include "l2xierr.h"
#include "l2xiscan.h"
#include "l2xisymt.h"
#include "l2xiprse.h"
#include "l2xiidbg.h"
#define DEFAULT_NUMERIC_FIELD_WIDTH 10
#define DEFAULT_PRECISION 2
/* EXTERNALS */
extern TOKEN_CODE token;
extern char word_string[];
extern SYMTAB_NODE_PTR symtab_display[];
extern int level;
extern TOKEN_CODE follow_parm_list[];
extern TOKEN_CODE statement_end_list[];
/* FORWARDS */
TYPE_STRUCT_PTR eof_eoln(), abs_sqr(), arctan_cos_exp_ln_sin_sqrt(),
pred_succ(), odd(), ord(), round_trunc();
TYPE_STRUCT_PTR atan(), exists_etc(), nvl_etc();
TYPE_STRUCT_PTR rexpr_etc(), hibound_etc(), length_etc();
/***************************************************************************/
/* standard_routine_call (rtn_idp) Process call to standard function */
/* return pointer to type structure of the call */
TYPE_STRUCT_PTR standard_routine_call(rtn_idp)
SYMTAB_NODE_PTR rtn_idp; /* routine id */
{
switch (rtn_idp->defn.info.routine.key) {
case READ:
case READLN: {
read_readln(rtn_idp);
return(NULL);
}
case WRITE:
case WRITELN: {
write_writeln(rtn_idp);
return(NULL);
}
case EOFF:
case EOLN: {
return(eof_eoln(rtn_idp));
}
case ABS: /* real or int arg -> real or int */
{
return(abs_sqr());
}
case COS: /* real or int arg -> real */
case EXP:
case SIN:
case SQRT:
case XACOS:
case XASIN:
case XLOG:
case XLOG2:
case XLOG10:
case XTAN: {
return(arctan_cos_exp_ln_sin_sqrt());
}
case XATAN: {
return(atan());
}
case ODD: { /* int arg -> boolean */
return(odd());
}
case ROUND: /* real arg -> int */
case TRUNC: {
return(round_trunc());
}
case L2XPRINT:
case L2XPRINTLN: { /* extra for ltx2x */
print_println(rtn_idp);
return(NULL);
}
case L2XSYSTEM: { /* extra for ltx2x */
system_etc(rtn_idp);
return(NULL);
}
case L2XREXPR: { /* extra for ltx2x two strings -> boolean */
return(rexpr_etc());
}
case XEXISTS: { /* any arg -> boolean */
return(exists_etc());
}
case XNVL: { /* two args -> one of these */
return(nvl_etc());
}
case XHIBOUND: /* agg arg -> int */
case XHIINDEX:
case XLOBOUND:
case XLOINDEX:
case XSIZEOF: {
return(hibound_etc());
}
case XLENGTH: { /* string arg -> int */
return(length_etc());
}
case XINSERT:
case XREMOVE: {
insert_etc(rtn_idp);
return(NULL);
}
case XBLENGTH: /* unimplemented EXPRESS functions */
case XFORMAT:
case XROLESOF:
case XTYPEOF:
case XUSEDIN:
case XVALUE:
case XVALUE_IN:
case XVALUE_UNIQUE: {
error(UNIMPLEMENTED_FEATURE);
return(NULL);
}
default : { /* should not be here */
error(UNEXPECTED_TOKEN);
return(NULL);
}
} /* end switch */
} /* end standard_routine_call */
/***************************************************************************/
/***************************************************************************/
/* read_readln(rtn_idp) Process call to read or readln */
read_readln(rtn_idp)
SYMTAB_NODE_PTR rtn_idp;
{
TYPE_STRUCT_PTR actual_parm_tp; /* actual param type */
/* parameters are optional for readln */
if (token == LPAREN) {
do {
get_token();
/* actuals should be variables, but parse anyway */
if (token == IDENTIFIER) {
SYMTAB_NODE_PTR idp;
search_and_find_all_symtab(idp);
actual_parm_tp = base_type(variable(idp, VARPARM_USE));
/* if (actual_parm_tp->form != SCALAR_FORM) error(INCOMPATIBLE_TYPES); */
if (actual_parm_tp != integer_typep &&
actual_parm_tp != real_typep &&
actual_parm_tp != logical_typep &&
actual_parm_tp != string_typep) {
error(INCOMPATIBLE_TYPES);
}
}
else {
actual_parm_tp = expression();
error(INVALID_VAR_PARM);
}
/* sync. Should be , or ) */
synchronize(follow_parm_list, statement_end_list, NULL);
} while (token == COMMA); /* end do */
if_token_get_else_error(RPAREN, MISSING_RPAREN);
} /* end if */
else {
if (rtn_idp->defn.info.routine.key == READ) error(WRONG_NUMBER_OF_PARMS);
}
} /* end read_readln */
/***************************************************************************/
/***************************************************************************/
/* write_writeln(rtn_idp) Process call to write or writeln */
/* Each actual parameter can be: */
/* <expr> or */
/* <expr> : <expr> or */
/* <expr> : <expr> : <expr> */
write_writeln(rtn_idp)
SYMTAB_NODE_PTR rtn_idp;
{
TYPE_STRUCT_PTR actual_parm_tp; /* actual parm type */
TYPE_STRUCT_PTR field_width_tp, precision_tp;
/* params are optional for writeln */
if (token == LPAREN) {
do {
get_token();
actual_parm_tp = base_type(expression());
if ((actual_parm_tp->form != SCALAR_FORM) &&
(actual_parm_tp != logical_typep) &&
(actual_parm_tp->form != STRING_FORM) &&
(actual_parm_tp->form != ENUM_FORM))
error(INVALID_EXPRESSION);
/* optional field width expression */
if (token == COLON) {
get_token();
field_width_tp = base_type(expression());
if (field_width_tp != integer_typep) error(INCOMPATIBLE_TYPES);
/* optional precision spec */
if (token == COLON) {
get_token();
precision_tp = base_type(expression());
if (precision_tp != integer_typep) error(INCOMPATIBLE_TYPES);
} /* end colon if */
} /* end colon if */
/* sync. Should be , or ) */
synchronize(follow_parm_list, statement_end_list, NULL);
} while (token == COMMA); /* end do */
if_token_get_else_error(RPAREN, MISSING_RPAREN);
} /* end if */
else {
if (rtn_idp->defn.info.routine.key == WRITE) error(WRONG_NUMBER_OF_PARMS);
}
} /* end write_writeln */
/***************************************************************************/
/***************************************************************************/
/* print_println(rtn_idp) Process call to print or println */
/* Each actual parameter can be: */
/* <expr> or */
/* <expr> : <expr> or */
/* <expr> : <expr> : <expr> */
/* At this point, identical to write_writeln */
print_println(rtn_idp)
SYMTAB_NODE_PTR rtn_idp;
{
TYPE_STRUCT_PTR actual_parm_tp; /* actual parm type */
TYPE_STRUCT_PTR field_width_tp, precision_tp;
/* params are optional for println */
if (token == LPAREN) {
do {
get_token();
actual_parm_tp = base_type(expression());
if ((actual_parm_tp->form != SCALAR_FORM) &&
(actual_parm_tp != logical_typep) &&
(actual_parm_tp->form != STRING_FORM) &&
(actual_parm_tp->form != ENUM_FORM))
error(INVALID_EXPRESSION);
/* optional field width expression */
if (token == COLON) {
get_token();
field_width_tp = base_type(expression());
if (field_width_tp != integer_typep) error(INCOMPATIBLE_TYPES);
/* optional precision spec */
if (token == COLON) {
get_token();
precision_tp = base_type(expression());
if (precision_tp != integer_typep) error(INCOMPATIBLE_TYPES);
} /* end colon if */
} /* end colon if */
/* sync. Should be , or ) */
synchronize(follow_parm_list, statement_end_list, NULL);
} while (token == COMMA); /* end do */
if_token_get_else_error(RPAREN, MISSING_RPAREN);
} /* end if */
else {
if (rtn_idp->defn.info.routine.key == WRITE) error(WRONG_NUMBER_OF_PARMS);
}
} /* end print_println */
/***************************************************************************/
/***************************************************************************/
/* eof_eoln(rtn_idp) Process call to eof or eoln. No parameters. */
/* return boolean result. */
TYPE_STRUCT_PTR eof_eoln(rtn_idp)
SYMTAB_NODE_PTR rtn_idp;
{
TYPE_STRUCT_PTR result_tp = logical_typep;
if (token == LPAREN) {
error(WRONG_NUMBER_OF_PARMS);
actual_parm_list(rtn_idp, FALSE);
}
return(result_tp);
} /* end eof_eoln */
/***************************************************************************/
/***************************************************************************/
/* system_etc() Process call to system, etc */
/* fun('string') */
/* One string parameter, no return value */
/* at entry, token is `fun' */
/* at exit, token is after closing ) */
system_etc(rtn_idp)
SYMTAB_NODE_PTR rtn_idp; /* routine id */
{
TYPE_STRUCT_PTR actual_parm_tp; /* actual parm type */
if (token == LPAREN) {
get_token();
actual_parm_tp = base_type(expression());
if (actual_parm_tp != string_typep &&
(actual_parm_tp->form != STRING_FORM)) {
error(INVALID_EXPRESSION);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else {
error(WRONG_NUMBER_OF_PARMS);
}
return;
} /* end SYSTEM_ETC */
/***************************************************************************/
/***************************************************************************/
/* length_etc() Process call to length, etc */
/* fun('string') */
/* One string parameter, integer return value */
/* at entry, token is `fun' */
/* at exit, token is after closing ) */
TYPE_STRUCT_PTR length_etc()
{
TYPE_STRUCT_PTR actual_parm_tp; /* actual parm type */
TYPE_STRUCT_PTR result_tp = integer_typep; /* result type */
if (token == LPAREN) {
get_token();
actual_parm_tp = base_type(expression());
if (actual_parm_tp != string_typep &&
(actual_parm_tp->form != STRING_FORM)) {
error(INVALID_EXPRESSION);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else {
error(WRONG_NUMBER_OF_PARMS);
}
return(result_tp);
} /* end LENGTH_ETC */
/***************************************************************************/
/***************************************************************************/
/* hibound_etc() Process call to hibound, etc */
/* fun(agg) */
/* One aggregate parameter, integer return value */
/* at entry, token is `fun' */
/* at exit, token is after closing ) */
TYPE_STRUCT_PTR hibound_etc()
{
TYPE_STRUCT_PTR actual_parm_tp; /* actual parm type */
TYPE_STRUCT_PTR result_tp = integer_typep; /* result type */
if (token == LPAREN) {
get_token();
actual_parm_tp = base_type(expression());
if ((actual_parm_tp->form != ARRAY_FORM) &&
(actual_parm_tp->form != BAG_FORM) &&
(actual_parm_tp->form != LIST_FORM) &&
(actual_parm_tp->form != SET_FORM) ) {
error(INVALID_EXPRESSION);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else {
error(WRONG_NUMBER_OF_PARMS);
}
return(result_tp);
} /* end HIBOUND_ETC */
/***************************************************************************/
/***************************************************************************/
/* rexpr_etc() Process call to rexpr, etc */
/* fun('string', 'string') */
/* Two string parameters, boolean return value */
/* at entry, token is `fun' */
/* at exit, token is after closing ) */
TYPE_STRUCT_PTR rexpr_etc()
{
TYPE_STRUCT_PTR actual_parm_tp; /* actual parm type */
TYPE_STRUCT_PTR result_tp = logical_typep; /* result type */
if (token == LPAREN) {
get_token();
actual_parm_tp = base_type(expression());
if (actual_parm_tp != string_typep &&
actual_parm_tp->form != STRING_FORM) {
error(INVALID_EXPRESSION);
}
if_token_get_else_error(COMMA, MISSING_COMMA);
actual_parm_tp = base_type(expression());
if (actual_parm_tp != string_typep &&
actual_parm_tp->form != STRING_FORM) {
error(INVALID_EXPRESSION);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else {
error(WRONG_NUMBER_OF_PARMS);
}
return(result_tp);
} /* end REXPR_ETC */
/***************************************************************************/
/***************************************************************************/
/* exists_etc Process call to exists, etc */
/* fun(any) -> boolean */
/* any type parm -> boolean result */
TYPE_STRUCT_PTR exists_etc()
{
TYPE_STRUCT_PTR parm_tp; /* actual param type */
TYPE_STRUCT_PTR result_tp = logical_typep; /* result type */
if (token == LPAREN) {
get_token();
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
return(result_tp);
} /* end EXISTS_ETC */
/***************************************************************************/
/***************************************************************************/
/* nvl_etc Process NVL, etc */
/* fun(p1, p2) -> p1 or p2 */
/* Two args, any type, returns one of them */
TYPE_STRUCT_PTR nvl_etc()
{
TYPE_STRUCT_PTR parm_tp; /* actual param type */
if (token == LPAREN) {
get_token();
parm_tp = base_type(expression());
if_token_get_else_error(COMMA, MISSING_COMMA);
/* PERHAPS SHOULD CHECK FOR ASSIGNMENT COMPATIBILITY */
/*
* if (parm_tp != base_type(expression()) ) {
* error(INCOMPATIBLE_TYPES);
* }
*/
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
return(parm_tp);
} /* end NVL_ETC */
/***************************************************************************/
/***************************************************************************/
/* abs_sqr Process call to abs or sqr. */
/* integer parm -> integer result */
/* real parm -> real result */
TYPE_STRUCT_PTR abs_sqr()
{
TYPE_STRUCT_PTR parm_tp; /* actual param type */
TYPE_STRUCT_PTR result_tp; /* result type */
if (token == LPAREN) {
get_token();
parm_tp = base_type(expression());
if ((parm_tp != integer_typep) && (parm_tp != real_typep)) {
error(INCOMPATIBLE_TYPES);
result_tp = real_typep;
}
else result_tp = parm_tp;
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
return(result_tp);
} /* end abs_sqr */
/***************************************************************************/
/***************************************************************************/
/* arctan_cos_exp_ln_sin_sqrt Process call to these */
/* integer parm -> real result */
/* real parm -> real result */
TYPE_STRUCT_PTR arctan_cos_exp_ln_sin_sqrt()
{
TYPE_STRUCT_PTR parm_tp; /* actual param type */
if (token == LPAREN) {
get_token();
parm_tp = base_type(expression());
if ((parm_tp != integer_typep) && (parm_tp != real_typep)) {
error(INCOMPATIBLE_TYPES);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
return(real_typep);
} /* end arctan_cos_exp_ln_sin_sqrt */
/***************************************************************************/
/***************************************************************************/
/* atan Process call to these */
/* fun(p1, p2) */
/* integer parm -> real result */
/* real parm -> real result */
TYPE_STRUCT_PTR atan()
{
TYPE_STRUCT_PTR parm_tp; /* actual param type */
if (token == LPAREN) {
get_token();
parm_tp = base_type(expression());
if ((parm_tp != integer_typep) && (parm_tp != real_typep)) {
error(INCOMPATIBLE_TYPES);
}
if_token_get_else_error(COMMA, MISSING_COMMA);
parm_tp = base_type(expression());
if ((parm_tp != integer_typep) && (parm_tp != real_typep)) {
error(INCOMPATIBLE_TYPES);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
return(real_typep);
} /* end ATAN */
/***************************************************************************/
/***************************************************************************/
/* odd Process call to odd. */
/* integer parm -> boolean result */
TYPE_STRUCT_PTR odd()
{
TYPE_STRUCT_PTR parm_tp; /* actual param type */
TYPE_STRUCT_PTR result_tp = logical_typep;
if (token == LPAREN) {
get_token();
parm_tp = base_type(expression());
if (parm_tp != integer_typep) {
error(INCOMPATIBLE_TYPES);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
return(logical_typep);
} /* end odd */
/***************************************************************************/
/***************************************************************************/
/* round_trunc Process call to round or trunc. */
/* real parm -> integer result */
TYPE_STRUCT_PTR round_trunc()
{
TYPE_STRUCT_PTR parm_tp; /* actual param type */
if (token == LPAREN) {
get_token();
parm_tp = base_type(expression());
if (parm_tp != real_typep) {
error(INCOMPATIBLE_TYPES);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
return(integer_typep);
} /* end round_trunc */
/***************************************************************************/
/***************************************************************************/
/* insert_etc Process a call to INSERT, etc */
/* list procedures */
/* INSERT(LIST, GENERIC, INTEGER) */
/* REMOVE(LIST, INTEGER) */
insert_etc(rtn_idp)
SYMTAB_NODE_PTR rtn_idp;
{
TYPE_STRUCT_PTR parm_tp; /* actual parm type */
if (token == LPAREN) {
get_token();
parm_tp = base_type(expression());
if (parm_tp->form != LIST_FORM) {
error(INCOMPATIBLE_TYPES);
}
if_token_get_else_error(COMMA, MISSING_COMMA);
if (rtn_idp->defn.info.routine.key == XINSERT) {
expression();
if_token_get_else_error(COMMA, MISSING_COMMA);
}
parm_tp = base_type(expression());
if (parm_tp != integer_typep) {
error(INCOMPATIBLE_TYPES);
}
if_token_get_else_error(RPAREN, MISSING_RPAREN);
}
else error(WRONG_NUMBER_OF_PARMS);
} /* end INSERT_ETC */
/***************************************************************************/
|
