4.4BSD/usr/src/contrib/groff-1.08/refer/refer.cc
// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with groff; see the file COPYING. If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "refer.h"
#include "refid.h"
#include "ref.h"
#include "token.h"
#include "search.h"
#include "command.h"
const char PRE_LABEL_MARKER = '\013';
const char POST_LABEL_MARKER = '\014';
const char LABEL_MARKER = '\015'; // label_type is added on
#define FORCE_LEFT_BRACKET 04
#define FORCE_RIGHT_BRACKET 010
static FILE *outfp = stdout;
string capitalize_fields;
string reverse_fields;
string abbreviate_fields;
string period_before_last_name = ". ";
string period_before_initial = ".";
string period_before_hyphen = "";
string period_before_other = ". ";
string sort_fields;
int annotation_field = -1;
string annotation_macro;
string discard_fields = "XYZ";
string pre_label = "\\*([.";
string post_label = "\\*(.]";
string sep_label = ", ";
int accumulate = 0;
int move_punctuation = 0;
int abbreviate_label_ranges = 0;
string label_range_indicator;
int label_in_text = 1;
int label_in_reference = 1;
int date_as_label = 0;
int sort_adjacent_labels = 0;
// Join exactly two authors with this.
string join_authors_exactly_two = " and ";
// When there are more than two authors join the last two with this.
string join_authors_last_two = ", and ";
// Otherwise join authors with this.
string join_authors_default = ", ";
string separate_label_second_parts = ", ";
// Use this string to represent that there are other authors.
string et_al = " et al";
// Use et al only if it can replace at least this many authors.
int et_al_min_elide = 2;
// Use et al only if the total number of authors is at least this.
int et_al_min_total = 3;
int compatible_flag = 0;
int short_label_flag = 0;
static int recognize_R1_R2 = 1;
search_list database_list;
int search_default = 1;
static int default_database_loaded = 0;
static reference **citation = 0;
static int ncitations = 0;
static int citation_max = 0;
static reference **reference_hash_table = 0;
static int hash_table_size;
static int nreferences = 0;
static int need_syncing = 0;
string pending_line;
string pending_lf_lines;
static void output_pending_line();
static unsigned immediately_handle_reference(const string &);
static void immediately_output_references();
static unsigned store_reference(const string &);
static void divert_to_temporary_file();
static reference *make_reference(const string &, unsigned *);
static void usage();
static void do_file(const char *);
static void split_punct(string &line, string &punct);
static void output_citation_group(reference **v, int n, label_type, FILE *fp);
static void possibly_load_default_database();
int main(int argc, char **argv)
{
program_name = argv[0];
static char stderr_buf[BUFSIZ];
setbuf(stderr, stderr_buf);
outfp = stdout;
int finished_options = 0;
int bib_flag = 0;
int done_spec = 0;
for (--argc, ++argv;
!finished_options && argc > 0 && argv[0][0] == '-'
&& argv[0][1] != '\0';
argv++, argc--) {
const char *opt = argv[0] + 1;
while (opt != 0 && *opt != '\0') {
switch (*opt) {
case 'C':
compatible_flag = 1;
opt++;
break;
case 'B':
bib_flag = 1;
label_in_reference = 0;
label_in_text = 0;
++opt;
if (*opt == '\0') {
annotation_field = 'X';
annotation_macro = "AP";
}
else if (csalnum(opt[0]) && opt[1] == '.' && opt[2] != '\0') {
annotation_field = opt[0];
annotation_macro = opt + 2;
}
opt = 0;
break;
case 'P':
move_punctuation = 1;
opt++;
break;
case 'R':
recognize_R1_R2 = 0;
opt++;
break;
case 'S':
// Not a very useful spec.
set_label_spec("(A.n|Q)', '(D.y|D)");
done_spec = 1;
pre_label = " (";
post_label = ")";
sep_label = "; ";
opt++;
break;
case 'V':
verify_flag = 1;
opt++;
break;
case 'f':
{
const char *num = 0;
if (*++opt == '\0') {
if (argc > 1) {
num = *++argv;
--argc;
}
else {
error("option `f' requires an argument");
usage();
}
}
else {
num = opt;
opt = 0;
}
for (const char *ptr = num; *ptr; ptr++)
if (!csdigit(*ptr)) {
error("bad character `%1' in argument to -f option", *ptr);
break;
}
if (*ptr == '\0') {
string spec;
spec = '%';
spec += num;
spec += '\0';
set_label_spec(spec.contents());
done_spec = 1;
}
break;
}
case 'b':
label_in_text = 0;
label_in_reference = 0;
opt++;
break;
case 'e':
accumulate = 1;
opt++;
break;
case 'c':
capitalize_fields = ++opt;
opt = 0;
break;
case 'k':
{
char buf[5];
if (csalpha(*++opt))
buf[0] = *opt++;
else {
if (*opt != '\0')
error("bad field name `%1'", *opt++);
buf[0] = 'L';
}
buf[1] = '~';
buf[2] = '%';
buf[3] = 'a';
buf[4] = '\0';
set_label_spec(buf);
done_spec = 1;
}
break;
case 'a':
{
for (const char *ptr = ++opt; *ptr; ptr++)
if (!csdigit(*ptr)) {
error("argument to `a' option not a number");
break;
}
if (*ptr == '\0') {
reverse_fields = 'A';
reverse_fields += opt;
}
opt = 0;
}
break;
case 'i':
linear_ignore_fields = ++opt;
opt = 0;
break;
case 'l':
{
char buf[INT_DIGITS*2 + 11]; // A.n+2D.y-3%a
strcpy(buf, "A.n");
if (*++opt != '\0' && *opt != ',') {
char *ptr;
long n = strtol(opt, &ptr, 10);
if (n == 0 && ptr == opt) {
error("bad integer `%1' in `l' option", opt);
opt = 0;
break;
}
if (n < 0)
n = 0;
opt = ptr;
sprintf(strchr(buf, '\0'), "+%d", n);
}
strcat(buf, "D.y");
if (*opt == ',')
opt++;
if (*opt != '\0') {
char *ptr;
long n = strtol(opt, &ptr, 10);
if (n == 0 && ptr == opt) {
error("bad integer `%1' in `l' option", opt);
opt = 0;
break;
}
if (n < 0)
n = 0;
sprintf(strchr(buf, '\0'), "-%d", n);
opt = ptr;
if (*opt != '\0')
error("argument to `l' option not of form `m,n'");
}
strcat(buf, "%a");
if (!set_label_spec(buf))
assert(0);
done_spec = 1;
}
break;
case 'n':
search_default = 0;
opt++;
break;
case 'p':
{
const char *filename = 0;
if (*++opt == '\0') {
if (argc > 1) {
filename = *++argv;
argc--;
}
else {
error("option `p' requires an argument");
usage();
}
}
else {
filename = opt;
opt = 0;
}
database_list.add_file(filename);
}
break;
case 's':
if (*++opt == '\0')
sort_fields = "AD";
else {
sort_fields = opt;
opt = 0;
}
accumulate = 1;
break;
case 't':
{
char *ptr;
long n = strtol(opt, &ptr, 10);
if (n == 0 && ptr == opt) {
error("bad integer `%1' in `t' option", opt);
opt = 0;
break;
}
if (n < 1)
n = 1;
linear_truncate_len = int(n);
opt = ptr;
break;
}
case 'v':
{
extern const char *version_string;
fprintf(stderr, "GNU refer version %s\n", version_string);
fflush(stderr);
opt++;
break;
}
case '-':
if (opt[1] == '\0') {
finished_options = 1;
opt++;
break;
}
// fall through
default:
error("unrecognized option `%1'", *opt);
usage();
break;
}
}
}
if (!done_spec)
set_label_spec("%1");
if (argc <= 0) {
if (bib_flag)
do_bib("-");
else
do_file("-");
}
else {
for (int i = 0; i < argc; i++) {
if (bib_flag)
do_bib(argv[i]);
else
do_file(argv[i]);
}
}
if (accumulate)
output_references();
if (fflush(stdout) < 0)
fatal("output error");
exit(0);
}
static void usage()
{
fprintf(stderr,
"usage: %s [-benvCPRS] [-aN] [-cXYZ] [-fN] [-iXYZ] [-kX] [-lM,N] [-p file]\n"
" [-sXYZ] [-tN] [-BL.M] [files ...]\n",
program_name);
exit(1);
}
static void possibly_load_default_database()
{
if (search_default && !default_database_loaded) {
char *filename = getenv("REFER");
if (filename)
database_list.add_file(filename);
else
database_list.add_file(DEFAULT_INDEX, 1);
default_database_loaded = 1;
}
}
static int is_list(const string &str)
{
const char *start = str.contents();
const char *end = start + str.length();
while (end > start && csspace(end[-1]))
end--;
while (start < end && csspace(*start))
start++;
return end - start == 6 && memcmp(start, "$LIST$", 6) == 0;
}
static void do_file(const char *filename)
{
FILE *fp;
if (strcmp(filename, "-") == 0) {
fp = stdin;
}
else {
errno = 0;
fp = fopen(filename, "r");
if (fp == 0) {
error("can't open `%1': %2", filename, strerror(errno));
return;
}
current_filename = filename;
}
fprintf(outfp, ".lf 1 %s\n", filename);
string line;
current_lineno = 0;
for (;;) {
line.clear();
for (;;) {
int c = getc(fp);
if (c == EOF) {
if (line.length() > 0)
line += '\n';
break;
}
if (illegal_input_char(c))
error("illegal input character code %1", c);
else {
line += c;
if (c == '\n')
break;
}
}
int len = line.length();
if (len == 0)
break;
current_lineno++;
if (len >= 2 && line[0] == '.' && line[1] == '[') {
int start_lineno = current_lineno;
int start_of_line = 1;
string str;
string post;
string pre(line.contents() + 2, line.length() - 3);
for (;;) {
int c = getc(fp);
if (c == EOF) {
error_with_file_and_line(current_filename, start_lineno,
"missing `.]' line");
break;
}
if (start_of_line)
current_lineno++;
if (start_of_line && c == '.') {
int d = getc(fp);
if (d == ']') {
while ((d = getc(fp)) != '\n' && d != EOF) {
if (illegal_input_char(d))
error("illegal input character code %1", d);
else
post += d;
}
break;
}
if (d != EOF)
ungetc(d, fp);
}
if (illegal_input_char(c))
error("illegal input character code %1", c);
else
str += c;
start_of_line = (c == '\n');
}
if (is_list(str)) {
output_pending_line();
if (accumulate)
output_references();
else
error("found `$LIST$' but not accumulating references");
}
else {
unsigned flags = (accumulate
? store_reference(str)
: immediately_handle_reference(str));
if (label_in_text) {
if (accumulate && outfp == stdout)
divert_to_temporary_file();
if (pending_line.length() == 0) {
warning("can't attach citation to previous line");
}
else
pending_line.set_length(pending_line.length() - 1);
string punct;
if (move_punctuation)
split_punct(pending_line, punct);
int have_text = pre.length() > 0 || post.length() > 0;
label_type lt = label_type(flags & ~(FORCE_LEFT_BRACKET
|FORCE_RIGHT_BRACKET));
if ((flags & FORCE_LEFT_BRACKET) || !have_text)
pending_line += PRE_LABEL_MARKER;
pending_line += pre;
pending_line += LABEL_MARKER + lt;
pending_line += post;
if ((flags & FORCE_RIGHT_BRACKET) || !have_text)
pending_line += POST_LABEL_MARKER;
pending_line += punct;
pending_line += '\n';
}
}
need_syncing = 1;
}
else if (len >= 4
&& line[0] == '.' && line[1] == 'l' && line[2] == 'f'
&& (compatible_flag || line[3] == '\n' || line[3] == ' ')) {
pending_lf_lines += line;
line += '\0';
if (interpret_lf_args(line.contents() + 3))
current_lineno--;
}
else if (recognize_R1_R2
&& len >= 4
&& line[0] == '.' && line[1] == 'R' && line[2] == '1'
&& (compatible_flag || line[3] == '\n' || line[3] == ' ')) {
line.clear();
int start_of_line = 1;
int start_lineno = current_lineno;
for (;;) {
int c = getc(fp);
if (c != EOF && start_of_line)
current_lineno++;
if (start_of_line && c == '.') {
c = getc(fp);
if (c == 'R') {
c = getc(fp);
if (c == '2') {
c = getc(fp);
if (compatible_flag || c == ' ' || c == '\n' || c == EOF) {
while (c != EOF && c != '\n')
c = getc(fp);
break;
}
else {
line += '.';
line += 'R';
line += '2';
}
}
else {
line += '.';
line += 'R';
}
}
else
line += '.';
}
if (c == EOF) {
error_with_file_and_line(current_filename, start_lineno,
"missing `.R2' line");
break;
}
if (illegal_input_char(c))
error("illegal input character code %1", int(c));
else {
line += c;
start_of_line = c == '\n';
}
}
output_pending_line();
if (accumulate)
output_references();
else
nreferences = 0;
process_commands(line, current_filename, start_lineno + 1);
need_syncing = 1;
}
else {
output_pending_line();
pending_line = line;
}
}
need_syncing = 0;
output_pending_line();
if (fp != stdin)
fclose(fp);
}
class label_processing_state {
enum {
NORMAL,
PENDING_LABEL,
PENDING_LABEL_POST,
PENDING_LABEL_POST_PRE,
PENDING_POST
} state;
label_type type; // type of pending labels
int count; // number of pending labels
reference **rptr; // pointer to next reference
int rcount; // number of references left
FILE *fp;
int handle_pending(int c);
public:
label_processing_state(reference **, int, FILE *);
~label_processing_state();
void process(int c);
};
static void output_pending_line()
{
if (label_in_text && !accumulate && ncitations > 0) {
label_processing_state state(citation, ncitations, outfp);
int len = pending_line.length();
for (int i = 0; i < len; i++)
state.process((unsigned char)(pending_line[i]));
}
else
put_string(pending_line, outfp);
pending_line.clear();
if (pending_lf_lines.length() > 0) {
put_string(pending_lf_lines, outfp);
pending_lf_lines.clear();
}
if (!accumulate)
immediately_output_references();
if (need_syncing) {
fprintf(outfp, ".lf %d %s\n", current_lineno, current_filename);
need_syncing = 0;
}
}
static void split_punct(string &line, string &punct)
{
const char *start = line.contents();
const char *end = start + line.length();
const char *ptr = start;
const char *last_token_start = 0;
for (;;) {
if (ptr >= end)
break;
last_token_start = ptr;
if (*ptr == PRE_LABEL_MARKER || *ptr == POST_LABEL_MARKER
|| (*ptr >= LABEL_MARKER && *ptr < LABEL_MARKER + N_LABEL_TYPES))
ptr++;
else if (!get_token(&ptr, end))
break;
}
if (last_token_start) {
const token_info *ti = lookup_token(last_token_start, end);
if (ti->is_punct()) {
punct.append(last_token_start, end - last_token_start);
line.set_length(last_token_start - start);
}
}
}
static void divert_to_temporary_file()
{
outfp = xtmpfile();
}
static void store_citation(reference *ref)
{
if (ncitations >= citation_max) {
if (citation == 0)
citation = new reference*[citation_max = 100];
else {
reference **old_citation = citation;
citation_max *= 2;
citation = new reference *[citation_max];
memcpy(citation, old_citation, ncitations*sizeof(reference *));
a_delete old_citation;
}
}
citation[ncitations++] = ref;
}
static unsigned store_reference(const string &str)
{
if (reference_hash_table == 0) {
reference_hash_table = new reference *[17];
hash_table_size = 17;
for (int i = 0; i < hash_table_size; i++)
reference_hash_table[i] = 0;
}
unsigned flags;
reference *ref = make_reference(str, &flags);
ref->compute_hash_code();
unsigned h = ref->hash();
for (reference **ptr = reference_hash_table + (h % hash_table_size);
*ptr != 0;
((ptr == reference_hash_table)
? (ptr = reference_hash_table + hash_table_size - 1)
: --ptr))
if (same_reference(**ptr, *ref))
break;
if (*ptr != 0) {
if (ref->is_merged())
warning("fields ignored because reference already used");
delete ref;
ref = *ptr;
}
else {
*ptr = ref;
ref->set_number(nreferences);
nreferences++;
ref->pre_compute_label();
ref->compute_sort_key();
if (nreferences*2 >= hash_table_size) {
// Rehash it.
reference **old_table = reference_hash_table;
int old_size = hash_table_size;
hash_table_size = next_size(hash_table_size);
reference_hash_table = new reference*[hash_table_size];
int i;
for (i = 0; i < hash_table_size; i++)
reference_hash_table[i] = 0;
for (i = 0; i < old_size; i++)
if (old_table[i]) {
for (reference **p = (reference_hash_table
+ (old_table[i]->hash() % hash_table_size));
*p;
((p == reference_hash_table)
? (p = reference_hash_table + hash_table_size - 1)
: --p))
;
*p = old_table[i];
}
a_delete old_table;
}
}
if (label_in_text)
store_citation(ref);
return flags;
}
unsigned immediately_handle_reference(const string &str)
{
unsigned flags;
reference *ref = make_reference(str, &flags);
ref->set_number(nreferences);
if (label_in_text || label_in_reference) {
ref->pre_compute_label();
ref->immediate_compute_label();
}
nreferences++;
store_citation(ref);
return flags;
}
static void immediately_output_references()
{
for (int i = 0; i < ncitations; i++) {
reference *ref = citation[i];
if (label_in_reference) {
fputs(".ds [F ", outfp);
const string &label = ref->get_label(NORMAL_LABEL);
if (label.length() > 0
&& (label[0] == ' ' || label[0] == '\\' || label[0] == '"'))
putc('"', outfp);
put_string(label, outfp);
putc('\n', outfp);
}
ref->output(outfp);
delete ref;
}
ncitations = 0;
}
static void output_citation_group(reference **v, int n, label_type type,
FILE *fp)
{
if (sort_adjacent_labels) {
// Do an insertion sort. Usually n will be very small.
for (int i = 1; i < n; i++) {
int num = v[i]->get_number();
reference *temp = v[i];
for (int j = i - 1; j >= 0 && v[j]->get_number() > num; j--)
v[j + 1] = v[j];
v[j + 1] = temp;
}
}
// This messes up if !accumulate.
if (accumulate && n > 1) {
// remove duplicates
int j = 1;
for (int i = 1; i < n; i++)
if (v[i]->get_label(type) != v[i - 1]->get_label(type))
v[j++] = v[i];
n = j;
}
string merged_label;
for (int i = 0; i < n; i++) {
int nmerged = v[i]->merge_labels(v + i + 1, n - i - 1, type, merged_label);
if (nmerged > 0) {
put_string(merged_label, fp);
i += nmerged;
}
else
put_string(v[i]->get_label(type), fp);
if (i < n - 1)
put_string(sep_label, fp);
}
}
label_processing_state::label_processing_state(reference **p, int n, FILE *f)
: state(NORMAL), count(0), rptr(p), rcount(n), fp(f)
{
}
label_processing_state::~label_processing_state()
{
int handled = handle_pending(EOF);
assert(!handled);
assert(rcount == 0);
}
int label_processing_state::handle_pending(int c)
{
switch (state) {
case NORMAL:
break;
case PENDING_LABEL:
if (c == POST_LABEL_MARKER) {
state = PENDING_LABEL_POST;
return 1;
}
else {
output_citation_group(rptr, count, type, fp);
rptr += count ;
rcount -= count;
state = NORMAL;
}
break;
case PENDING_LABEL_POST:
if (c == PRE_LABEL_MARKER) {
state = PENDING_LABEL_POST_PRE;
return 1;
}
else {
output_citation_group(rptr, count, type, fp);
rptr += count;
rcount -= count;
put_string(post_label, fp);
state = NORMAL;
}
break;
case PENDING_LABEL_POST_PRE:
if (c >= LABEL_MARKER
&& c < LABEL_MARKER + N_LABEL_TYPES
&& c - LABEL_MARKER == type) {
count += 1;
state = PENDING_LABEL;
return 1;
}
else {
output_citation_group(rptr, count, type, fp);
rptr += count;
rcount -= count;
put_string(sep_label, fp);
state = NORMAL;
}
break;
case PENDING_POST:
if (c == PRE_LABEL_MARKER) {
put_string(sep_label, fp);
state = NORMAL;
return 1;
}
else {
put_string(post_label, fp);
state = NORMAL;
}
break;
}
return 0;
}
void label_processing_state::process(int c)
{
if (handle_pending(c))
return;
assert(state == NORMAL);
switch (c) {
case PRE_LABEL_MARKER:
put_string(pre_label, fp);
state = NORMAL;
break;
case POST_LABEL_MARKER:
state = PENDING_POST;
break;
case LABEL_MARKER:
case LABEL_MARKER + 1:
count = 1;
state = PENDING_LABEL;
type = label_type(c - LABEL_MARKER);
break;
default:
state = NORMAL;
putc(c, fp);
break;
}
}
extern "C" {
static int rcompare(const void *p1, const void *p2)
{
return compare_reference(**(reference **)p1, **(reference **)p2);
}
}
void output_references()
{
assert(accumulate);
if (nreferences > 0) {
int j = 0;
int i;
for (i = 0; i < hash_table_size; i++)
if (reference_hash_table[i] != 0)
reference_hash_table[j++] = reference_hash_table[i];
assert(j == nreferences);
for (; j < hash_table_size; j++)
reference_hash_table[j] = 0;
qsort(reference_hash_table, nreferences, sizeof(reference*), rcompare);
for (i = 0; i < nreferences; i++)
reference_hash_table[i]->set_number(i);
compute_labels(reference_hash_table, nreferences);
}
if (outfp != stdout) {
rewind(outfp);
{
label_processing_state state(citation, ncitations, stdout);
int c;
while ((c = getc(outfp)) != EOF)
state.process(c);
}
ncitations = 0;
fclose(outfp);
outfp = stdout;
}
if (nreferences > 0) {
fputs(".]<\n", outfp);
for (int i = 0; i < nreferences; i++) {
if (sort_fields.length() > 0)
reference_hash_table[i]->print_sort_key_comment(outfp);
if (label_in_reference) {
fputs(".ds [F ", outfp);
const string &label = reference_hash_table[i]->get_label(NORMAL_LABEL);
if (label.length() > 0
&& (label[0] == ' ' || label[0] == '\\' || label[0] == '"'))
putc('"', outfp);
put_string(label, outfp);
putc('\n', outfp);
}
reference_hash_table[i]->output(outfp);
delete reference_hash_table[i];
reference_hash_table[i] = 0;
}
fputs(".]>\n", outfp);
nreferences = 0;
}
clear_labels();
}
static reference *find_reference(const char *query, int query_len)
{
// This is so that error messages look better.
while (query_len > 0 && csspace(query[query_len - 1]))
query_len--;
string str;
for (int i = 0; i < query_len; i++)
str += query[i] == '\n' ? ' ' : query[i];
str += '\0';
possibly_load_default_database();
search_list_iterator iter(&database_list, str.contents());
reference_id rid;
const char *start;
int len;
if (!iter.next(&start, &len, &rid)) {
error("no matches for `%1'", str.contents());
return 0;
}
const char *end = start + len;
while (start < end) {
if (*start == '%')
break;
while (start < end && *start++ != '\n')
;
}
if (start >= end) {
error("found a reference for `%1' but it didn't contain any fields",
str.contents());
return 0;
}
reference *result = new reference(start, end - start, &rid);
if (iter.next(&start, &len, &rid))
warning("multiple matches for `%1'", str.contents());
return result;
}
static reference *make_reference(const string &str, unsigned *flagsp)
{
const char *start = str.contents();
const char *end = start + str.length();
const char *ptr = start;
while (ptr < end) {
if (*ptr == '%')
break;
while (ptr < end && *ptr++ != '\n')
;
}
*flagsp = 0;
for (; start < ptr; start++) {
if (*start == '#')
*flagsp = (SHORT_LABEL | (*flagsp & (FORCE_RIGHT_BRACKET
| FORCE_LEFT_BRACKET)));
else if (*start == '[')
*flagsp |= FORCE_LEFT_BRACKET;
else if (*start == ']')
*flagsp |= FORCE_RIGHT_BRACKET;
else if (!csspace(*start))
break;
}
if (start >= end) {
error("empty reference");
return new reference;
}
reference *database_ref = 0;
if (start < ptr)
database_ref = find_reference(start, ptr - start);
reference *inline_ref = 0;
if (ptr < end)
inline_ref = new reference(ptr, end - ptr);
if (inline_ref) {
if (database_ref) {
database_ref->merge(*inline_ref);
delete inline_ref;
return database_ref;
}
else
return inline_ref;
}
else if (database_ref)
return database_ref;
else
return new reference;
}
static void do_ref(const string &str)
{
if (accumulate)
(void)store_reference(str);
else {
(void)immediately_handle_reference(str);
immediately_output_references();
}
}
static void trim_blanks(string &str)
{
const char *start = str.contents();
const char *end = start + str.length();
while (end > start && end[-1] != '\n' && csspace(end[-1]))
--end;
str.set_length(end - start);
}
void do_bib(const char *filename)
{
FILE *fp;
if (strcmp(filename, "-") == 0)
fp = stdin;
else {
errno = 0;
fp = fopen(filename, "r");
if (fp == 0) {
error("can't open `%1': %2", filename, strerror(errno));
return;
}
current_filename = filename;
}
enum {
START, MIDDLE, BODY, BODY_START, BODY_BLANK, BODY_DOT
} state = START;
string body;
for (;;) {
int c = getc(fp);
if (c == EOF)
break;
if (illegal_input_char(c)) {
error("illegal input character code %1", c);
continue;
}
switch (state) {
case START:
if (c == '%') {
body = c;
state = BODY;
}
else if (c != '\n')
state = MIDDLE;
break;
case MIDDLE:
if (c == '\n')
state = START;
break;
case BODY:
body += c;
if (c == '\n')
state = BODY_START;
break;
case BODY_START:
if (c == '\n') {
do_ref(body);
state = START;
}
else if (c == '.')
state = BODY_DOT;
else if (csspace(c)) {
state = BODY_BLANK;
body += c;
}
else {
body += c;
state = BODY;
}
break;
case BODY_BLANK:
if (c == '\n') {
trim_blanks(body);
do_ref(body);
state = START;
}
else if (csspace(c))
body += c;
else {
body += c;
state = BODY;
}
break;
case BODY_DOT:
if (c == ']') {
do_ref(body);
state = MIDDLE;
}
else {
body += '.';
body += c;
state = c == '\n' ? BODY_START : BODY;
}
break;
default:
assert(0);
}
if (c == '\n')
current_lineno++;
}
switch (state) {
case START:
case MIDDLE:
break;
case BODY:
body += '\n';
do_ref(body);
break;
case BODY_DOT:
case BODY_START:
do_ref(body);
break;
case BODY_BLANK:
trim_blanks(body);
do_ref(body);
break;
}
fclose(fp);
}
// from the Dragon Book
unsigned hash_string(const char *s, int len)
{
const char *end = s + len;
unsigned h = 0, g;
while (s < end) {
h <<= 4;
h += *s++;
if ((g = h & 0xf0000000) != 0) {
h ^= g >> 24;
h ^= g;
}
}
return h;
}
int next_size(int n)
{
static const int table_sizes[] = {
101, 503, 1009, 2003, 3001, 4001, 5003, 10007, 20011, 40009,
80021, 160001, 500009, 1000003, 2000003, 4000037, 8000009,
16000057, 32000011, 64000031, 128000003, 0
};
for (const int *p = table_sizes; *p <= n && *p != 0; p++)
;
assert(*p != 0);
return *p;
}