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parser.c
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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "npl.h"
//#define CHECK 1 //for parser debug check
int readparse(void)
{
int res;
paren_nest = 0;
res = parser(NIL, NIL, NIL, NIL, 0, 0);
if (paren_nest != 0)
error(SYNTAX_ERR, "extra paren ", NIL);
return (res);
}
/*
terminal 0= period is terminal, 1=
parsemode 0= comma is operator, 1= comma is separator
*/
int
parser(int operand, int operator, int weight, int spec, int terminal,
int parsemode)
{
int temp, temp1, temp2, temp3, w1, w2;
//for debug
#if CHECK
printf("terminal %d, parsemode %d\n", terminal, parsemode);
print(operand);
print(operator);
printf("\n");
#endif
gettoken();
if (stok.type == FILEEND) { // end of file
if (operand != NIL || operator != NIL)
error(SYNTAX_ERR, "expected period ", NIL);
return (FEND);
}
if (terminal == 1 && (stok.type == PERIOD || (parsemode == 1 && stok.type == COMMA) || stok.type == RBRACKET || stok.type == RPAREN || stok.type == RCURL || stok.type == VERTICAL)) { //these are terminations
#if CHECK
printf("terminate with terminalmode == 1\n");
#endif
stok.flag = BACK;
goto exit;
}
if (terminal == 0 && stok.type == PERIOD) { //termination
#if CHECK
printf("terminate with terminalmode == 0\n");
#endif
exit:
if (nullp(operator)) {
if (length(operand) != 1)
error(SYNTAX_ERR, "expected operator ", NIL);
else
return (car(operand));
} else {
if (length(operand) != 2)
error(SYNTAX_ERR, "expected two operand ", NIL);
else
return (cons(car(operator), reverse(operand)));
}
}
stok.flag = BACK;
temp = readitem();
#if CHECK
print(temp);
printf("%d", GET_OPT(temp));
#endif
if (terminal == 1 && infix_operator_p(temp) &&
!mixturep(temp) && GET_CDR(temp) >= weight) {
#if CHECK
printf("terminate with GET_CDR(%d)>=weight(%d)\n",
GET_CDR(temp), weight);
#endif
unread = temp;
goto exit;
} else if (terminal == 1 && infix_operator_p(temp) &&
mixturep(temp) && get_2nd_weight(temp) >= weight &&
!(nullp(operand) && nullp(operator))) {
#if CHECK
printf("terminate with get_2nd_weight(%d)>=weight(%d)\n",
get_2nd_weight(temp), weight);
#endif
unread = temp;
goto exit;
}
//operator as an atom
if (parsemode == 1 && infix_operator_p(temp)) {
gettoken();
if ((parsemode == 1 && stok.type == COMMA) ||
stok.type == RBRACKET ||
stok.type == RPAREN || stok.type == RCURL
|| stok.type == VERTICAL) {
#if CHECK
printf("terminate operator as an atom\n");
#endif
stok.flag = BACK;
return (temp);
} else
stok.flag = BACK;
}
//prefix notation
if (infix_operator_p(temp) &&
length(operand) == length(operator) &&
(stok.ch == '(' || stok.ch == NUL) && stok.ahead != ' ' &&
GET_OPT(temp) != FX && GET_OPT(temp) != FY) {
gettoken();
if (stok.type == LPAREN) {
#if CHECK
printf("prefix notation\n");
#endif
temp1 = cons(temp, readparen());
temp2 =
parser(cons(temp1, operand), operator, weight, spec,
terminal, parsemode);
prefix_flag = 1;
return (temp2);
} else {
stok.flag = BACK;
}
}
if (infix_operator_p(temp) && (GET_OPT(temp) == FX || GET_OPT(temp) == FX_XFX || GET_OPT(temp) == FX_XFY || GET_OPT(temp) == FX_YFX) && length(operand) == length(operator)) { //as FX
if (GET_OPT(temp) == FX)
w1 = GET_CDR(temp);
else
w1 = get_1st_weight(temp);
if (mixturep(car(operator)))
w2 = get_2nd_weight(car(operator));
else
w2 = GET_CDR(car(operator));
#if CHECK
printf("fx %d %d\n", w1, w2);
#endif
if (nullp(operator)) {
#if CHECK
printf("null operator\n");
#endif
if (w1 == 1200) {
temp1 = parser(NIL, NIL, 1201, FX, 0, parsemode);
return (list2(temp, temp1));
} else {
temp1 = parser(NIL, NIL, w1, FX, 1, parsemode);
return (parser
(cons(list2(temp, temp1), operand), operator,
weight, spec, terminal, parsemode));
}
} else if (w1 < w2) {
#if CHECK
printf("s1 < w2\n");
#endif
temp1 = list2(temp, parser(NIL, NIL, w1, FX, 1, parsemode));
return (parser
(cons(temp1, operand), operator, weight, spec,
terminal, parsemode));
}
} else if (infix_operator_p(temp) && (GET_OPT(temp) == FY || GET_OPT(temp) == FY_XFX || GET_OPT(temp) == FY_XFY || GET_OPT(temp) == FY_YFX) && length(operand) == length(operator)) { //as FY
if (GET_OPT(temp) == FY)
w1 = GET_CDR(temp);
else
w1 = get_1st_weight(temp);
#if CHECK
printf("fy %dn", w1);
#endif
temp1 = parser(NIL, NIL, w1 + 1, FY, 1, parsemode);
if (temp == makeatom("-", OPE) && numberp(temp1))
temp2 = mult(temp1, makeint(-1));
else
temp2 = list2(temp, temp1);
return (parser
(cons(temp2, operand), operator, weight, spec, terminal,
parsemode));
} else if (infix_operator_p(temp) &&
(GET_OPT(temp) == XFX ||
GET_OPT(temp) == FX_XFX || GET_OPT(temp) == FY_XFX)) {
if (GET_OPT(temp) == XFX)
w1 = GET_CDR(temp);
else
w1 = get_2nd_weight(temp);
if (mixturep(car(operator)))
w2 = get_2nd_weight(car(operator));
else
w2 = GET_CDR(car(operator));
#if CHECK
printf("xfx %d %d\n", w1, w2);
#endif
if (nullp(operator)) {
#if CHECK
printf("null operator\n");
#endif
return (parser
(operand, cons(temp, operator), weight, spec, terminal,
parsemode));
} else if (w1 == w2) {
#if CHECK
printf("w1 == w2\n");
#endif
temp1 =
list3(temp, car(operand),
parser(NIL, NIL, w1, XFX, 1, parsemode));
return (parser
(cons(temp1, cdr(operand)), operator, weight, spec,
terminal, parsemode));
} else if (w1 < w2) {
#if CHECK
printf("w1 < w2\n");
#endif
temp1 = parser(NIL, NIL, w1, XFX, 1, parsemode);
if (stok.type == RPAREN) {
temp2 = list3(temp, car(operand), temp1);
temp3 = list3(car(operator), cadr(operand), temp2);
return (temp3);
} else {
temp2 = list3(temp, car(operand), temp1);
return (parser
(cons(temp2, cdr(operand)), operator, weight, spec,
terminal, parsemode));
}
} else {
#if CHECK
printf("w1 > w2\n");
#endif
temp1 = cons(car(operator), reverse(operand));
return (parser
(list1(temp1), cons(temp, cdr(operator)), weight, spec,
terminal, parsemode));
}
} else if (infix_operator_p(temp) &&
(GET_OPT(temp) == YFX ||
GET_OPT(temp) == FX_YFX || GET_OPT(temp) == FY_YFX)) {
if (GET_OPT(temp) == YFX)
w1 = GET_CDR(temp);
else
w1 = get_2nd_weight(temp);
if (mixturep(car(operator)))
w2 = get_2nd_weight(car(operator));
else
w2 = GET_CDR(car(operator));
#if CHECK
printf("yfx %d %d\n", w1, w2);
#endif
if (nullp(operator)) {
#if CHECK
printf("null operator\n");
#endif
temp1 =
parser(operand, cons(temp, operator), w1, YFX, 1,
parsemode);
return (parser
(list1(temp1), NIL, weight, spec, terminal,
parsemode));
} else if (w1 == w2) {
#if CHECK
printf("s1 == w2\n");
#endif
temp1 = parser(NIL, NIL, w1, YFX, 1, parsemode);
temp2 =
list3(temp, cons(car(operator), reverse(operand)), temp1);
return (parser
(list1(temp2), NIL, weight, spec, terminal,
parsemode));
} else if (w1 < w2) {
#if CHECK
printf("s1 < w2\n");
#endif
temp1 = parser(NIL, NIL, w1, YFX, 1, parsemode);
temp2 = list3(temp, car(operand), temp1);
return (parser
(cons(temp2, cdr(operand)), operator, weight, spec,
terminal, parsemode));
} else {
#if CHECK
printf("s1 > w2\n");
#endif
temp1 = cons(car(operator), reverse(operand));
return (parser
(list1(temp1), cons(temp, cdr(operator)), weight, spec,
terminal, parsemode));
}
} else if (infix_operator_p(temp) &&
(GET_OPT(temp) == XFY ||
GET_OPT(temp) == FX_XFY || GET_OPT(temp) == FY_XFY)) {
if (GET_OPT(temp) == XFY)
w1 = GET_CDR(temp);
else
w1 = get_2nd_weight(temp);
if (mixturep(car(operator)))
w2 = get_2nd_weight(car(operator));
else
w2 = GET_CDR(car(operator));
#if CHECK
printf("xfy %d %d\n", w1, w2);
#endif
if (nullp(operator)) {
#if CHECK
printf("null operator\n");
#endif
return (parser
(operand, cons(temp, operator), weight, XFY, terminal,
parsemode));
} else if (w1 == w2) {
#if CHECK
printf("w1 == w2\n");
#endif
temp1 =
parser(list1(car(operand)), list1(temp), w1 + 1, XFY, 1,
parsemode);
temp2 = list3(car(operator), cadr(operand), temp1);
return (parser
(list1(temp2), NIL, weight, spec, terminal,
parsemode));
} else if (w1 < w2) {
#if CHECK
printf("w1 < w2\n");
#endif
temp1 =
parser(list1(car(operand)), list1(temp), w1 + 1, XFY, 1,
parsemode);
if (stok.type == RPAREN) {
temp2 = list3(car(operator), cadr(operand), temp1);
return (parser
(list1(temp2), NIL, weight, spec, terminal,
parsemode));
} else {
return (parser
(cons(temp1, cdr(operand)), operator, weight, spec,
terminal, parsemode));
}
} else {
#if CHECK
printf("w1 > w2\n");
#endif
temp1 = cons(car(operator), reverse(operand));
temp2 =
parser(list1(temp1), list1(temp), w1 + 1, XFY, 1,
parsemode);
return (parser
(list1(temp2), cdr(operator), weight, spec, terminal,
parsemode));
}
} else if (infix_operator_p(temp) &&
(GET_OPT(temp) == XF ||
GET_OPT(temp) == FX_XF || GET_OPT(temp) == FY_XF)) {
if (GET_OPT(temp) == XF)
w1 = GET_CDR(temp);
else
w1 = get_1st_weight(temp);
if (mixturep(car(operator)))
w2 = get_2nd_weight(temp);
else
w2 = GET_CDR(temp);
#if CHECK
printf("xf %d %d\n", w1, w2);
#endif
if (nullp(operator)) {
#if CHECK
printf("null operator\n");
#endif
temp1 = list2(temp, car(operand));
return (parser
(cons(temp1, NIL), operator, weight, spec, terminal,
parsemode));
} else if (w1 < w2) {
#if CHECK
printf("w1 < w2\n");
#endif
temp1 = list2(temp, car(operand));
return (parser
(cons(temp1, cdr(operand)), operator, weight, spec,
terminal, parsemode));
} else {
#if CHECK
printf("w1 > w2\n");
#endif
temp1 = cons(car(operator), reverse(operand));
temp2 = list2(temp, temp1);
return (parser
(cons(temp2, NIL), NIL, weight, spec, terminal,
parsemode));
}
} else if (infix_operator_p(temp) &&
(GET_OPT(temp) == YF ||
GET_OPT(temp) == FX_YF || GET_OPT(temp) == FY_YF)) {
#if CHECK
printf("yf\n");
#endif
temp1 = list2(temp, car(operand));
return (parser
(cons(temp1, cdr(operand)), operator, weight, spec,
terminal, parsemode));
} else { //operand
if (temp == RIGHTPAREN) {
stok.flag = BACK;
goto exit;
} else if (temp == LEFTPAREN) {
paren_nest++;
//check (operator) ex (*)
gettoken();
if (stok.ahead == ')') {
stok.flag = BACK;
temp1 = readitem();
gettoken(); //discard ')'
paren_nest--;
return (parser
(cons(temp1, operand), operator, weight, spec,
terminal, parsemode));
}
stok.flag = BACK;
//comma is operator
temp1 = parser(NIL, NIL, 1201, NIL, 0, 0);
gettoken(); //discard RPAREN
paren_nest--;
return (parser
(cons(temp1, operand), operator, weight, spec,
terminal, parsemode));
} else {
if (length(operand) >= 2)
error(SYNTAX_ERR, "expected operator ", temp);
return (parser
(cons(temp, operand), operator, weight, spec, terminal,
parsemode));
}
}
return (NIL);
}
//-------readitem()--------
int readc(void)
{
int c;
if (string_term_flag == 1)
return (read_string_term(1));
else if (input_stream == standard_input && repl_flag)
c = read_line(0);
else
c = getc(GET_PORT(input_stream));
if (c == EOL) {
line++;
column = 0;
} else
column++;
return (c);
}
void unreadc(char c)
{
if (string_term_flag == 1) {
read_string_term(-1);
return;
}
if (c == EOL)
line--;
else
column--;
if (input_stream == standard_input && repl_flag)
c = read_line(-1);
else
ungetc(c, GET_PORT(input_stream));
}
#define SETBUF(c) { \
if(pos >= BUFSIZE-1) \
error(RESOURCE_ERR, "gettoken ", NIL); \
stok.buf[pos++] = c; \
}
#define SETBUFEND(c) { \
if(pos >= BUFSIZE-1) \
error(RESOURCE_ERR, "gettoken ", NIL); \
stok.buf[pos] = c; \
}
void gettoken(void)
{
int c, c1, pos, i;
stok.space = NOTSKIP;
if (stok.flag == BACK) {
stok.flag = GO;
return;
}
if (stok.ch == ')') {
stok.type = RPAREN;
stok.ch = NUL;
stok.ahead = NUL;
return;
}
if (stok.ch == '(') {
stok.type = LPAREN;
stok.ch = NUL;
stok.ahead = NUL;
return;
}
if (stok.ch == '[') {
stok.type = LBRACKET;
stok.ch = NUL;
stok.ahead = NUL;
return;
}
if (stok.ch == ']') {
stok.type = RBRACKET;
stok.ch = NUL;
stok.ahead = NUL;
return;
}
if (stok.ch == '|') {
stok.type = VERTICAL;
stok.ch = NUL;
stok.ahead = NUL;
return;
}
if (stok.ch == '.') {
c = readc();
if (c <= ' ') {
stok.type = PERIOD;
unreadc(c);
stok.ch = NUL;
stok.ahead = NUL;
return;
} else {
unreadc(c);
}
}
if (stok.ch != NUL) {
c = stok.ch;
stok.ch = NUL;
stok.ahead = NUL;
} else
c = readc();
skip:
while (c == SPACE || c == EOL || c == TAB || c == RET) {
c = readc();
stok.space = SKIP;
}
//skip comment line
//when EOF is at line end, return FILEEND object
if (c == '%') {
while (!(c == EOL)) {
c = readc();
if (c == EOF) {
stok.type = FILEEND;
return;
}
}
stok.ch = NUL;
goto skip;
}
//comment /* */
if (c == '/') {
c = readc();
if (c == '*') {
reskip:
c = readc();
while (c != '*') {
c = readc();
}
c = readc();
if (c != '/')
goto reskip;
else {
c = readc();
goto skip;
}
} else {
unreadc(c);
c = '/';
}
}
//when end of file, return FILEEND object
if (c == EOF) {
stok.type = FILEEND;
return;
}
switch (c) {
case '(':
stok.type = LPAREN;
return;
case ')':
stok.type = RPAREN;
return;
case '[':
stok.type = LBRACKET;
return;
case ']':
stok.type = RBRACKET;
return;
case '|':
stok.type = VERTICAL;
return;
case '{':
c1 = readc();
if (c1 == '}') {
stok.buf[0] = '{';
stok.buf[1] = '}';
stok.buf[2] = NUL;
stok.type = ATOMOBJ;
return;
}
unreadc(c1);
stok.type = LCURL;
return;
case '}':
stok.type = RCURL;
return;
case ',':
stok.type = COMMA;
return;
case ';':
stok.type = SEMICOLON;
return;
case '.':
c = readc();
if (c <= ' ') {
stok.type = PERIOD;
unreadc(c);
return;
} else {
stok.type = DOT;
unreadc(c);
return;
}
case '#':
stok.type = SHARP;
return;
case '"':
stok.type = DBLQUOTE;
return;
}
//constant-atom in Unicode
if (islower(c) || unicodep(c)) {
pos = 0;
while ((isalpha(c) || isdigit(c) || c == '_' ||
unicodep(c)) && !isatomch(c)) {
SETBUF(c)
if (isUni2(c)) {
c = readc();
SETBUF(c)
c = readc();
} else if (isUni3(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else if (isUni4(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else if (isUni5(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else if (isUni6(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else
c = readc();
}
SETBUFEND(NUL)
stok.ch = c;
stok.ahead = c;
for (i = 0; i < OPERATOR_NUMBER; i++) {
if (strcmp(operator[i], stok.buf) == 0) {
stok.type = OPERATOR;
return;
}
}
for (i = 0; i < FUNCTION_NUMBER; i++) {
if (strcmp(function[i], stok.buf) == 0) {
stok.type = FUNCTION;
return;
}
}
for (i = 0; i < BUILTIN_NUMBER; i++) {
if (strcmp(builtin[i], stok.buf) == 0) {
stok.type = BUILTIN;
return;
}
}
for (i = 0; i < COMPILED_NUMBER; i++) {
if (strcmp(compiled[i], stok.buf) == 0) {
stok.type = COMPILED;
return;
}
}
stok.type = ATOMOBJ;
return;
}
//variable
if (isupper(c)) {
pos = 0;
SETBUF(c)
c = readc();
while (isalpha(c) || isdigit(c) || c == '_') {
SETBUF(c)
c = readc();
}
SETBUFEND(NUL)
stok.type = VARIABLE;
stok.ch = c;
stok.ahead = c;
return;
}
//cut operator
if (c == '!') {
pos = 0;
SETBUF(c)
SETBUFEND(NUL)
stok.type = BUILTIN;
stok.ch = NUL;
stok.ahead = NUL;
return;
}
//variable in Unicode
if (c == '_') {
pos = 0;
SETBUF(c)
c = readc();
while (isalpha(c) || isdigit(c) || c == '_' || unicodep(c)) {
SETBUF(c)
if (isUni2(c)) {
c = readc();
SETBUF(c)
c = readc();
} else if (isUni3(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else if (isUni4(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else if (isUni5(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else if (isUni6(c)) {
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
SETBUF(c)
c = readc();
} else
c = readc();
}
SETBUFEND(NUL)
if (pos == 1) {
stok.type = ANOYMOUS;
stok.ch = c;
stok.ahead = c;
return;
} else {
stok.type = VARIABLE;
stok.ch = c;
stok.ahead = c;
return;
}
}
//special atom
if (c == '\'') {
pos = 0;
redo:
c = readc();
while (c != '\'') {
if (c == EOL)
error(SYNTAX_ERR, "unexpected EOL in quoted atom ", NIL);
if (c == EOF)
error(SYNTAX_ERR, "unexpected EOF in quoted atom ", NIL);
if (c == '\\') {
c = readc();
if (c == EOL) {
//skip eol
goto redo;
} else if (c == '\"' || c == '\\' || c == '\'' || c == '`')
stok.buf[pos++] = '\\';
else if (c == 'a' || c == 'b' || c == 'f' ||
c == 'n' || c == 'r' || c == 't' || c == 'v') {
stok.buf[pos++] = '\\';
} else {
error(SYNTAX_ERR, "illegal token in quoted atom ",
NIL);
}
}
SETBUF(c)
c = readc();
}
c = readc();
if (c == '\'') { // case ex 'let''s' -> let's
SETBUF(c)
goto redo;
} else
unreadc(c);
SETBUFEND(NUL)
stok.ch = NUL;
stok.ahead = c;
for (i = 0; i < FUNCTION_NUMBER; i++) {
if (strcmp(function[i], stok.buf) == 0) {
stok.type = FUNCTION;
return;
}
}
for (i = 0; i < BUILTIN_NUMBER; i++) {
if (strcmp(builtin[i], stok.buf) == 0) {
stok.type = BUILTIN;
return;
}
}
for (i = 0; i < COMPILED_NUMBER; i++) {
if (strcmp(compiled[i], stok.buf) == 0) {
stok.type = COMPILED;
return;
}
}
stok.type = ATOMOBJ;
return;
}
//string
if (c == '$') {
pos = 0;
c = readc();
c1 = readc();
while (!(c == '$' && c1 != '$')) {
if (c == '$') {
if (c1 == '$') {
SETBUF(c)
} else
error(SYNTAX_ERR, "double $ in string token ", NIL);
} else if (c == EOF)
error(SYNTAX_ERR, "not exist right $ in file ", NIL);
else {
SETBUF(c)
unreadc(c1);
}
c = readc();
c1 = readc();
}
unreadc(c1);
SETBUFEND(NUL)
stok.type = STRING;
stok.ch = NUL;
stok.ahead = c;
return;
}
if (c == '`')
error(SYNTAX_ERR, "illegal token back quote ", NIL);
//number octal ex 0o12345
//number binaly ex 0b10110101
//number hexadecimal ex 0x89ABC
if (c == '0') {
c = readc();
if (c == 'o') {
pos = 0;
c = readc();
while (isoctch(c)) {
SETBUF(c)
c = readc();
}
SETBUFEND(NUL)
stok.type = OCTNUM;
stok.ch = c;
return;
} else if (c == 'b') {
pos = 0;
c = readc();
while (isbinch(c)) {
SETBUF(c)
c = readc();
}
SETBUFEND(NUL)
stok.type = BINNUM;
stok.ch = c;
return;
} else if (c == 'x') {
pos = 0;
c = readc();
while (ishexch(c)) {
SETBUF(c)
c = readc();
}
SETBUFEND(NUL)
stok.type = HEXNUM;
stok.ch = c;
return;
} else if (c == '\'') {
c = readc();
if (c != '\\') {
stok.buf[0] = c;
stok.type = CHARCODE;
return;
} else { /* ex 0'\141\ or 0'\x97\ */
c = readc();
if (c == 'n') {
stok.buf[0] = EOL;
stok.type = CHARCODE;
return;
} else if (c == 't') {
stok.buf[0] = TAB;
stok.type = CHARCODE;
return;
} else if (c == 'f') {
stok.buf[0] = FF;
stok.type = CHARCODE;
return;
} else if (c == 'r') {
stok.buf[0] = CR;
stok.type = CHARCODE;
return;
} else if (c == 'v') {