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/*++
/* NAME
/* tok_class 3
/* SUMMARY
/* token classification
/* PACKAGE
/* unproto
/* SYNOPSIS
/* #include "token.h"
/*
/* struct token *tok_class(skip)
/* int skip;
/* DESCRIPTION
/* tok_class() collects a single and composite tokens, and
/* recognizes keywords.
/* At present, the only composite tokens are ()-delimited,
/* comma-separated lists.
/*
/* The skip argument has the same meaning as with the tok_get()
/* function.
/* DIAGNOSTICS
/* The code complains if input terminates in the middle of a list.
/* BUGS
/* Does not preserve white space at the beginning of a list element
/* or after the end of a list.
/* AUTHOR(S)
/* Wietse Venema
/* Eindhoven University of Technology
/* Department of Mathematics and Computer Science
/* Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
/* LAST MODIFICATION
/* 91/11/30 21:10:28
/* VERSION/RELEASE
/* 1.3
/*--*/
static char class_sccsid[] = "@(#) tok_class.c 1.3 91/11/30 21:10:28";
/* C library */
#include <stdio.h>
extern char *strcpy();
/* Application-specific stuff */
#include "error.h"
#include "vstring.h"
#include "token.h"
#include "symbol.h"
static struct token *tok_list();
static void tok_list_struct();
static void tok_list_append();
/* tok_space_append - append trailing space except after list */
#define tok_space_append(list,t) { \
if (list == 0 /* leading space*/ \
|| list->tokno == TOK_LIST) \
tok_free(t); \
else \
tok_list_append(list, t); \
}
/* tok_class - discriminate single tokens, keywords, and composite tokens */
struct token *tok_class(skip)
int skip;
{
register struct token *t;
register struct symbol *s;
if (t = tok_get(skip)) {
switch (t->tokno) {
case '(': /* beginning of list */
t = tok_list(t);
break;
case TOK_WORD: /* look up keyword */
if (s = sym_find(t->vstr->str))
t->tokno = s->type;
break;
}
}
return (t);
}
/* tok_list - collect ()-delimited, comma-separated list of tokens */
static struct token *tok_list(t)
struct token *t;
{
register struct token *list = tok_alloc();
char filename[BUFSIZ];
int lineno;
/* Save context of '(' for diagnostics. */
strcpy(filename, curr_path);
lineno = curr_line;
list->tokno = TOK_LIST;
list->head = list->tail = t;
#ifdef DEBUG
strcpy(list->vstr->str, "LIST");
#endif
for (;;) {
if ((t = tok_get(DO_WSPACE)) == 0) { /* skip blanks */
error_where(0, filename, lineno, "unmatched '('");
return (list); /* do not waste any data */
}
switch (t->tokno) {
case ')': /* end of list */
tok_free(t);
return (list);
case '{': /* struct/union type */
tok_list_struct(list->tail, t);
break;
case TOK_WSPACE: /* preserve trailing blanks */
tok_space_append(list->tail->tail, t); /* except after list */
break;
case '\n': /* preserve line count */
tok_flush(t);
break;
case ',': /* list separator */
tok_list_append(list, t);
break;
case '(': /* beginning of list */
tok_list_append(list->tail, tok_list(t));
break;
default: /* ordinary token */
tok_list_append(list->tail, t);
break;
}
}
}
/* tok_list_struct - collect structured type info within list */
static void tok_list_struct(list, t)
register struct token *list;
register struct token *t;
{
tok_list_append(list, t);
while (t = tok_class(DO_WSPACE)) {
switch (t->tokno) {
case '\n': /* preserve line count */
tok_flush(t);
break;
case TOK_WSPACE: /* preserve trailing blanks */
tok_space_append(list->tail, t); /* except after list */
break;
case '{': /* recurse */
tok_list_struct(list, t);
break;
case '}': /* done */
tok_list_append(list, t);
return;
default: /* other */
tok_list_append(list, t);
break;
}
}
}
/* tok_list_append - append data to list */
static void tok_list_append(h, t)
struct token *h;
struct token *t;
{
if (h->head == 0) {
h->head = h->tail = t;
} else {
h->tail->next = t;
h->tail = t;
}
}
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