/* Copyright 2009
* Kaz Kylheku <kkylheku@gmail.com>
* Vancouver, Canada
* All rights reserved.
*
* BSD License:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <dirent.h>
#include <setjmp.h>
#include <stdarg.h>
#include "lib.h"
#include "gc.h"
#include "unwind.h"
#include "regex.h"
#include "stream.h"
#include "parser.h"
#include "txr.h"
#include "match.h"
int output_produced;
static void debugf(const char *fmt, ...)
{
if (opt_loglevel >= 2) {
va_list vl;
va_start (vl, fmt);
format(std_error, "~a: ", prog_string, nao);
vformat(std_error, fmt, vl);
put_cchar(std_error, '\n');
va_end (vl);
}
}
static void debuglf(obj_t *line, const char *fmt, ...)
{
if (opt_loglevel >= 2) {
va_list vl;
va_start (vl, fmt);
format(std_error, "~a: (~a:~a) ", prog_string, spec_file_str, line, nao);
vformat(std_error, fmt, vl);
put_cchar(std_error, '\n');
va_end (vl);
}
}
static void debuglcf(obj_t *line, const char *fmt, ...)
{
if (opt_loglevel >= 2) {
va_list vl;
va_start (vl, fmt);
format(std_error, "~a: (~a:~a) ", prog_string, spec_file_str, line, nao);
vcformat(std_error, fmt, vl);
put_cchar(std_error, '\n');
va_end (vl);
}
}
static void sem_error(obj_t *line, const char *fmt, ...)
{
va_list vl;
obj_t *stream = make_string_output_stream();
va_start (vl, fmt);
if (line)
format(stream, "(~a:~a) ", spec_file_str, line, nao);
(void) vformat(stream, fmt, vl);
va_end (vl);
uw_throw(query_error, get_string_from_stream(stream));
abort();
}
static void file_err(obj_t *line, const char *fmt, ...)
{
va_list vl;
obj_t *stream = make_string_output_stream();
va_start (vl, fmt);
if (line)
format(stream, "(~a:~a) ", spec_file_str, line, nao);
(void) vformat(stream, fmt, vl);
va_end (vl);
uw_throw(file_error, get_string_from_stream(stream));
abort();
}
void dump_shell_string(const char *str)
{
int ch;
putchar('"');
while ((ch = *str++) != 0) {
switch (ch) {
case '"': case '`': case '$': case '\\': case '\n':
putchar('\\');
/* fallthrough */
default:
putchar(ch);
}
}
putchar('"');
}
void dump_var(const char *name, char *pfx1, size_t len1,
char *pfx2, size_t len2, obj_t *value, int level)
{
if (len1 >= 112 || len2 >= 112)
internal_error("too much depth in bindings");
if (stringp(value) || chrp(value)) {
fputs(name, stdout);
fputs(pfx1, stdout);
fputs(pfx2, stdout);
putchar('=');
if (stringp(value)) {
dump_shell_string(c_str(value));
} else {
char mini[2];
mini[0] = c_chr(value);
mini[1] = 0;
dump_shell_string(mini);
}
putchar('\n');
} else {
obj_t *iter;
int i;
size_t add1 = 0, add2 = 0;
for (i = 0, iter = value; iter; iter = cdr(iter), i++) {
if (level < opt_arraydims) {
add2 = sprintf(pfx2 + len2, "[%d]", i);
add1 = 0;
} else {
add1 = sprintf(pfx1 + len1, "_%d", i);
add2 = 0;
}
dump_var(name, pfx1, len1 + add1, pfx2, len2 + add2, car(iter), level + 1);
}
}
}
void dump_bindings(obj_t *bindings)
{
if (opt_loglevel >= 2) {
fputs("raw_bindings:\n", stderr);
dump(bindings, std_error);
}
while (bindings) {
char pfx1[128], pfx2[128];
obj_t *var = car(car(bindings));
obj_t *value = cdr(car(bindings));
const char *name = c_str(symbol_name(var));
*pfx1 = 0; *pfx2 = 0;
dump_var(name, pfx1, 0, pfx2, 0, value, 0);
bindings = cdr(bindings);
}
}
obj_t *depth(obj_t *obj)
{
obj_t *dep = zero;
if (obj == nil)
return one;
if (atom(obj))
return zero;
while (obj) {
dep = max2(dep, depth(first(obj)));
obj = rest(obj);
}
return plus(dep, one);
}
obj_t *weird_merge(obj_t *left, obj_t *right)
{
obj_t *left_depth = depth(left);
obj_t *right_depth = depth(right);
while (lt(left_depth, right_depth) || zerop(left_depth)) {
left = cons(left, nil);
left_depth = plus(left_depth, one);
}
while (lt(right_depth, left_depth) || zerop(right_depth)) {
right = cons(right, nil);
right_depth = plus(right_depth, one);
}
return append2(left, right);
}
obj_t *map_leaf_lists(obj_t *func, obj_t *list)
{
if (atom(list))
return list;
if (none_satisfy(list, func_n1(listp), nil))
return funcall1(func, list);
return mapcar(bind2(func_n2(map_leaf_lists), func), list);
}
obj_t *dest_bind(obj_t *bindings, obj_t *pattern, obj_t *value)
{
if (nullp(pattern))
return bindings;
if (symbolp(pattern)) {
obj_t *existing = assoc(bindings, pattern);
if (existing) {
if (tree_find(value, cdr(existing)))
return bindings;
if (tree_find(cdr(existing), value))
return bindings;
debugf("bind variable mismatch: ~a", pattern, nao);
return t;
}
return cons(cons(pattern, value), bindings);
}
if (consp(pattern)) {
obj_t *piter = pattern, *viter = value;
while (consp(piter) && consp(viter))
{
bindings = dest_bind(bindings, car(piter), car(viter));
if (bindings == t)
return t;
piter = cdr(piter);
viter = cdr(viter);
} while (consp(piter) && consp(viter));
if (symbolp(piter)) {
bindings = dest_bind(bindings, piter, viter);
if (bindings == t)
return t;
}
}
return bindings;
}
obj_t *match_line(obj_t *bindings, obj_t *specline, obj_t *dataline,
obj_t *pos, obj_t *spec_lineno, obj_t *data_lineno,
obj_t *file)
{
#define LOG_MISMATCH(KIND) \
debuglf(spec_lineno, KIND " mismatch, position ~a (~a:~a)", pos, \
file, data_lineno, nao); \
debuglf(spec_lineno, " ~a", dataline, nao); \
if (c_num(pos) < 77) \
debuglcf(spec_lineno, " %*s^", (int) c_num(pos), "")
#define LOG_MATCH(KIND, EXTENT) \
debuglf(spec_lineno, KIND " matched, position ~a-~a (~a:~a)", \
pos, EXTENT, file, data_lineno, nao); \
debuglf(spec_lineno, " ~a", dataline, nao); \
if (c_num(EXTENT) < 77) \
debuglcf(spec_lineno, " %*s%-*s^", (int) c_num(pos), \
"", (int) (c_num(EXTENT) - c_num(pos)), "^")
for (;;) {
obj_t *elem;
if (specline == nil)
break;
elem = first(specline);
switch (elem ? elem->t.type : 0) {
case CONS: /* directive */
{
obj_t *directive = first(elem);
if (directive == var) {
obj_t *sym = second(elem);
obj_t *pat = third(elem);
obj_t *modifier = fourth(elem);
obj_t *pair = assoc(bindings, sym); /* var exists already? */
if (pair) {
/* If the variable already has a binding, we replace
it with its value, and treat it as a string match.
The spec looks like ((var <sym> <pat>) ...)
and it must be transformed into
(<sym-substituted> <pat> ...) */
if (pat) {
specline = cons(cdr(pair), cons(pat, rest(specline)));
} else if (nump(modifier)) {
obj_t *past = plus(pos, modifier);
if (length_str_lt(dataline, past) || lt(past, pos))
{
LOG_MISMATCH("fixed field size");
return nil;
}
if (!tree_find(trim_str(sub_str(dataline, pos, past)),
cdr(pair)))
{
LOG_MISMATCH("fixed field contents");
return nil;
}
LOG_MATCH("fixed field", past);
pos = past;
specline = cdr(specline);
} else {
specline = cons(cdr(pair), rest(specline));
}
continue;
} else if (pat == nil) { /* match to end of line or with regex */
if (consp(modifier)) {
obj_t *past = match_regex(dataline, car(modifier), pos);
if (nullp(past)) {
LOG_MISMATCH("var positive regex");
return nil;
}
LOG_MATCH("var positive regex", past);
bindings = acons_new(bindings, sym, sub_str(dataline, pos, past));
pos = past;
} else if (nump(modifier)) {
obj_t *past = plus(pos, modifier);
if (length_str_lt(dataline, past) || lt(past, pos))
{
LOG_MISMATCH("count based var");
return nil;
}
LOG_MATCH("count based var", past);
bindings = acons_new(bindings, sym, trim_str(sub_str(dataline, pos, past)));
pos = past;
} else {
bindings = acons_new(bindings, sym, sub_str(dataline, pos, nil));
pos = length_str(dataline);
}
} else if (pat->t.type == STR) {
obj_t *find = search_str(dataline, pat, pos, modifier);
if (!find) {
LOG_MISMATCH("var delimiting string");
return nil;
}
LOG_MATCH("var delimiting string", find);
bindings = acons_new(bindings, sym, sub_str(dataline, pos, find));
pos = plus(find, length_str(pat));
} else if (consp(pat) && typeof(first(pat)) == regex) {
obj_t *find = search_regex(dataline, first(pat), pos, modifier);
obj_t *fpos = car(find);
obj_t *flen = cdr(find);
if (!find) {
LOG_MISMATCH("var delimiting regex");
return nil;
}
LOG_MATCH("var delimiting regex", fpos);
bindings = acons_new(bindings, sym, sub_str(dataline, pos, fpos));
pos = plus(fpos, flen);
} else if (consp(pat) && first(pat) == var) {
/* Unbound var followed by var: the following one must be bound. */
obj_t *second_sym = second(pat);
obj_t *next_pat = third(pat);
obj_t *pair = assoc(bindings, second_sym); /* var exists already? */
if (!pair)
sem_error(spec_lineno, "consecutive unbound variables", nao);
/* Re-generate a new spec with an edited version of
the element we just processed, and repeat. */
{
obj_t *new_elem = list(var, sym, cdr(pair), modifier, nao);
if (next_pat)
specline = cons(new_elem, cons(next_pat, rest(specline)));
else
specline = cons(new_elem, rest(specline));
}
continue;
} else if (consp(pat) && (consp(first(pat)) || stringp(first(pat)))) {
cons_bind (find, len, search_str(dataline, pat, pos, modifier));
if (!find) {
LOG_MISMATCH("string");
return nil;
}
bindings = acons_new(bindings, sym, sub_str(dataline, pos, find));
pos = plus(find, len);
} else {
sem_error(spec_lineno,
"variable followed by invalid element", nao);
}
} else if (typeof(directive) == regex) {
obj_t *past = match_regex(dataline, directive, pos);
if (nullp(past)) {
LOG_MISMATCH("regex");
return nil;
}
LOG_MATCH("regex", past);
pos = past;
} else if (directive == coll) {
obj_t *coll_specline = second(elem);
obj_t *until_specline = third(elem);
obj_t *bindings_coll = nil;
obj_t *iter;
for (;;) {
cons_bind (new_bindings, new_pos,
match_line(bindings, coll_specline, dataline, pos,
spec_lineno, data_lineno, file));
if (until_specline) {
cons_bind (until_bindings, until_pos,
match_line(bindings, until_specline, dataline, pos,
spec_lineno, data_lineno, file));
if (until_pos) {
(void) until_bindings;
LOG_MATCH("until", until_pos);
break;
} else {
LOG_MISMATCH("until");
}
}
if (new_pos) {
LOG_MATCH("coll", new_pos);
for (iter = new_bindings; iter && iter != bindings;
iter = cdr(iter))
{
obj_t *binding = car(iter);
obj_t *existing = assoc(bindings_coll, car(binding));
bindings_coll = acons_new(bindings_coll, car(binding),
cons(cdr(binding), cdr(existing)));
}
}
if (new_pos && !equal(new_pos, pos)) {
pos = new_pos;
bug_unless (length_str_ge(dataline, pos));
} else {
pos = plus(pos, one);
}
if (length_str_le(dataline, pos))
break;
}
if (!bindings_coll) {
debuglf(spec_lineno, "nothing was collected", nao);
return nil;
}
for (iter = bindings_coll; iter; iter = cdr(iter)) {
obj_t *pair = car(iter);
obj_t *rev = cons(car(pair), nreverse(cdr(pair)));
bindings = cons(rev, bindings);
}
} else if (consp(directive) || stringp(directive)) {
cons_bind (find, len, search_str_tree(dataline, elem, pos, nil));
obj_t *newpos;
if (find == nil || !equal(find, pos)) {
LOG_MISMATCH("string tree");
return nil;
}
newpos = plus(find, len);
LOG_MATCH("string tree", newpos);
pos = newpos;
} else {
sem_error(spec_lineno, "unknown directive: ~a", directive, nao);
}
}
break;
case STR:
{
obj_t *find = search_str(dataline, elem, pos, nil);
obj_t *newpos;
if (find == nil || !equal(find, pos)) {
LOG_MISMATCH("string");
return nil;
}
newpos = plus(find, length_str(elem));
LOG_MATCH("string", newpos);
pos = newpos;
break;
}
default:
sem_error(spec_lineno, "unsupported object in spec: ~s", elem, nao);
}
specline = cdr(specline);
}
return cons(bindings, pos);
}
obj_t *format_field(obj_t *string_or_list, obj_t *spec)
{
if (!stringp(string_or_list))
return string_or_list;
{
obj_t *right = lt(spec, zero);
obj_t *width = if3(lt(spec, zero), neg(spec), spec);
obj_t *diff = minus(width, length_str(string_or_list));
if (le(diff, zero))
return string_or_list;
if (ge(length_str(string_or_list), width))
return string_or_list;
{
obj_t *padding = mkstring(diff, chr(' '));
return if3(right,
cat_str(list(padding, string_or_list, nao), nil),
cat_str(list(string_or_list, padding, nao), nil));
}
}
}
obj_t *subst_vars(obj_t *spec, obj_t *bindings)
{
list_collect_decl(out, iter);
while (spec) {
obj_t *elem = first(spec);
if (consp(elem)) {
if (first(elem) == var) {
obj_t *sym = second(elem);
obj_t *pat = third(elem);
obj_t *modifier = fourth(elem);
obj_t *pair = assoc(bindings, sym);
if (pair) {
if (pat)
spec = cons(cdr(pair), cons(pat, rest(spec)));
else if (nump(modifier))
spec = cons(format_field(cdr(pair), modifier), rest(spec));
else
spec = cons(cdr(pair), rest(spec));
continue;
}
} else if (first(elem) == quasi) {
obj_t *nested = subst_vars(rest(elem), bindings);
list_collect_append(iter, nested);
spec = cdr(spec);
continue;
} else {
obj_t *nested = subst_vars(elem, bindings);
list_collect_append(iter, nested);
spec = cdr(spec);
continue;
}
}
list_collect(iter, elem);
spec = cdr(spec);
}
return out;
}
obj_t *eval_form(obj_t *form, obj_t *bindings)
{
if (!form)
return cons(t, form);
else if (symbolp(form))
return assoc(bindings, form);
else if (consp(form)) {
if (car(form) == quasi) {
return cons(t, cat_str(subst_vars(rest(form), bindings), nil));
} else if (regexp(car(form))) {
return cons(t, form);
} else {
obj_t *subforms = mapcar(bind2other(func_n2(eval_form), bindings), form);
if (all_satisfy(subforms, identity_f, nil))
return cons(t, mapcar(func_n1(cdr), subforms));
return nil;
}
} if (stringp(form)) {
return cons(t, form);
}
return cons(t, form);
}
typedef struct fpip {
FILE *f;
DIR *d;
enum { fpip_fclose, fpip_pclose, fpip_closedir } close;
} fpip_t;
fpip_t complex_open(obj_t *name, obj_t *output)
{
fpip_t ret = { 0 };
const char *namestr = c_str(name);
long len = c_num(length_str(name));
if (len == 0)
return ret;
if (!strcmp(namestr, "-")) {
ret.close = fpip_fclose;
ret.f = output ? stdout : stdin;
output_produced = output ? 1 : 0;
} else if (namestr[0] == '!') {
ret.close = fpip_pclose;
ret.f = popen(namestr+1, output ? "w" : "r");
} else if (namestr[0] == '$') {
if (output)
return ret;
ret.close = fpip_closedir;
ret.d = opendir(namestr+1);
} else {
ret.close = fpip_fclose;
ret.f = fopen(namestr, output ? "w" : "r");
}
return ret;
}
int complex_open_failed(fpip_t fp)
{
return fp.f == 0 && fp.d == 0;
}
void complex_close(fpip_t fp)
{
if (fp.f == 0)
return;
switch (fp.close) {
case fpip_fclose:
if (fp.f != stdin && fp.f != stdout)
fclose(fp.f);
return;
case fpip_pclose:
pclose(fp.f);
return;
case fpip_closedir:
closedir(fp.d);
return;
}
internal_error("bad input source type code");
}
obj_t *complex_snarf(fpip_t fp, obj_t *name)
{
switch (fp.close) {
case fpip_fclose:
return lazy_stream_cons(make_stdio_stream(fp.f, t, nil));
case fpip_pclose:
return lazy_stream_cons(make_pipe_stream(fp.f, t, nil));
case fpip_closedir:
return lazy_stream_cons(make_dir_stream(fp.d));
}
internal_error("bad input source type");
}
obj_t *robust_length(obj_t *obj)
{
if (obj == nil)
return zero;
if (atom(obj))
return negone;
return length(obj);
}
obj_t *bind_car(obj_t *bind_cons)
{
return if3(consp(cdr(bind_cons)),
cons(car(bind_cons), car(cdr(bind_cons))),
bind_cons);
}
obj_t *bind_cdr(obj_t *bind_cons)
{
return if3(consp(cdr(bind_cons)),
cons(car(bind_cons), cdr(cdr(bind_cons))),
bind_cons);
}
obj_t *extract_vars(obj_t *output_spec)
{
list_collect_decl (vars, tai);
if (consp(output_spec)) {
if (first(output_spec) == var) {
list_collect (tai, second(output_spec));
} else {
for (; output_spec; output_spec = cdr(output_spec))
list_collect_nconc(tai, extract_vars(car(output_spec)));
}
}
return vars;
}
obj_t *extract_bindings(obj_t *bindings, obj_t *output_spec)
{
list_collect_decl (bindings_out, tail);
obj_t *var_list = extract_vars(output_spec);
for (; bindings; bindings = cdr(bindings))
if (memq(car(car(bindings)), var_list))
list_collect(tail, car(bindings));
return bindings_out;
}
void do_output_line(obj_t *bindings, obj_t *specline,
obj_t *spec_lineno, FILE *out)
{
for (; specline; specline = rest(specline)) {
obj_t *elem = first(specline);
switch (elem ? elem->t.type : 0) {
case CONS:
{
obj_t *directive = first(elem);
if (directive == var) {
obj_t *str = cat_str(subst_vars(cons(elem, nil), bindings), nil);
if (str == nil)
sem_error(spec_lineno, "bad substitution: ~a", second(elem), nao);
fputs(c_str(str), out);
} else if (directive == rep) {
obj_t *main_clauses = second(elem);
obj_t *single_clauses = third(elem);
obj_t *first_clauses = fourth(elem);
obj_t *last_clauses = fifth(elem);
obj_t *empty_clauses = sixth(elem);
obj_t *bind_cp = extract_bindings(bindings, elem);
obj_t *max_depth = reduce_left(func_n2(max2),
bind_cp, zero,
chain(list(func_n1(cdr),
func_n1(robust_length),
nao)));
if (equal(max_depth, zero) && empty_clauses) {
do_output_line(bindings, empty_clauses, spec_lineno, out);
} else if (equal(max_depth, one) && single_clauses) {
obj_t *bind_a = mapcar(func_n1(bind_car), bind_cp);
do_output_line(bind_a, single_clauses, spec_lineno, out);
} else if (!zerop(max_depth)) {
long i;
for (i = 0; i < c_num(max_depth); i++) {
obj_t *bind_a = mapcar(func_n1(bind_car), bind_cp);
obj_t *bind_d = mapcar(func_n1(bind_cdr), bind_cp);
if (i == 0 && first_clauses) {
do_output_line(bind_a, first_clauses, spec_lineno, out);
} else if (i == c_num(max_depth) - 1 && last_clauses) {
do_output_line(bind_a, last_clauses, spec_lineno, out);
} else {
do_output_line(bind_a, main_clauses, spec_lineno, out);
}
bind_cp = bind_d;
}
}
} else {
sem_error(spec_lineno, "unknown directive: ~a", directive, nao);
}
}
break;
case STR:
fputs(c_str(elem), out);
break;
case 0:
break;
default:
sem_error(spec_lineno, "unsupported object in output spec: ~s", elem);
}
}
}
void do_output(obj_t *bindings, obj_t *specs, FILE *out)
{
if (equal(specs, null_list))
return;
for (; specs; specs = cdr(specs)) {
cons_bind (spec_lineno, specline, first(specs));
obj_t *first_elem = first(specline);
if (consp(first_elem)) {
obj_t *sym = first(first_elem);
if (sym == repeat) {
obj_t *main_clauses = second(first_elem);
obj_t *single_clauses = third(first_elem);
obj_t *first_clauses = fourth(first_elem);
obj_t *last_clauses = fifth(first_elem);
obj_t *empty_clauses = sixth(first_elem);
obj_t *bind_cp = extract_bindings(bindings, first_elem);
obj_t *max_depth = reduce_left(func_n2(max2),
bind_cp, zero,
chain(list(func_n1(cdr),
func_n1(robust_length),
nao)));
if (equal(max_depth, zero) && empty_clauses) {
do_output(bind_cp, empty_clauses, out);
} else if (equal(max_depth, one) && single_clauses) {
obj_t *bind_a = mapcar(func_n1(bind_car), bind_cp);
do_output(bind_a, single_clauses, out);
} else if (!zerop(max_depth)) {
long i;
for (i = 0; i < c_num(max_depth); i++) {
obj_t *bind_a = mapcar(func_n1(bind_car), bind_cp);
obj_t *bind_d = mapcar(func_n1(bind_cdr), bind_cp);
if (i == 0 && first_clauses) {
do_output(bind_a, first_clauses, out);
} else if (i == c_num(max_depth) - 1 && last_clauses) {
do_output(bind_a, last_clauses, out);
} else {
do_output(bind_a, main_clauses, out);
}
bind_cp = bind_d;
}
}
continue;
}
}
do_output_line(bindings, specline, spec_lineno, out);
putc('\n', out);
}
}
obj_t *match_files(obj_t *spec, obj_t *files,
obj_t *bindings, obj_t *first_file_parsed,
obj_t *data_linenum)
{
obj_t *data = nil;
long data_lineno = 0;
if (listp(first_file_parsed)) {
data = first_file_parsed;
data_lineno = c_num(data_linenum);
first_file_parsed = nil;
} else if (files) {
obj_t *source_spec = first(files);
obj_t *name = consp(source_spec) ? cdr(source_spec) : source_spec;
fpip_t fp = (errno = 0, complex_open(name, nil));
obj_t *first_spec_item = second(first(spec));
if (consp(first_spec_item) && eq(first(first_spec_item), next)) {
debugf("not opening source ~a since query starts with next directive",
name, nao);
} else {
debugf("opening data source ~a", name, nao);
if (complex_open_failed(fp)) {
if (consp(source_spec) && car(source_spec) == nothrow) {
debugf("could not open ~a: treating as failed match due to nothrow",
name, nao);
return nil;
} else if (errno != 0)
file_err(nil, "could not open ~a (error ~a/~a)", name,
num(errno), string(strerror(errno)), nao);
else
file_err(nil, "could not open ~a", name, nao);
return nil;
}
files = cons(name, cdr(files)); /* Get rid of cons and nothrow */
if ((data = complex_snarf(fp, name)) != nil)
data_lineno = 1;
}
}
for (; spec; spec = rest(spec), data = rest(data), data_lineno++)
repeat_spec_same_data:
{
obj_t *specline = rest(first(spec));
obj_t *dataline = first(data);
obj_t *spec_linenum = first(first(spec));
obj_t *first_spec = first(specline);
if (consp(first_spec)) {
obj_t *sym = first(first_spec);
if (sym == skip) {
obj_t *max = first(rest(first_spec));
long cmax = nump(max) ? c_num(max) : 0;
long reps = 0;
if (rest(specline))
sem_error(spec_linenum,
"unexpected material after skip directive", nao);
if ((spec = rest(spec)) == nil)
break;
{
uw_block_begin(nil, result);
while (dataline && (!max || reps++ < cmax)) {
result = match_files(spec, files, bindings,
data, num(data_lineno));
if (result) {
debuglf(spec_linenum, "skip matched ~a:~a", first(files),
num(data_lineno), nao);
break;
}
debuglf(spec_linenum, "skip didn't match ~a:~a", first(files),
num(data_lineno), nao);
data = rest(data);
data_lineno++;
dataline = first(data);
}
uw_block_end;
if (result)
return result;
}
debuglf(spec_linenum, "skip failed", nao);
return nil;
} else if (sym == trailer) {
if (rest(specline))
sem_error(spec_linenum,
"unexpected material after trailer directive", nao);
if ((spec = rest(spec)) == nil)
break;
{
cons_bind (new_bindings, success,
match_files(spec, files, bindings,
data, num(data_lineno)));
if (success)
return cons(new_bindings, cons(data, num(data_lineno)));
return nil;
}
} else if (sym == freeform) {
obj_t *args = rest(first_spec);
obj_t *vals = mapcar(func_n1(cdr),
mapcar(bind2other(func_n2(eval_form),
bindings), args));
if ((spec = rest(spec)) == nil) {
sem_error(spec_linenum,
"freeform must be followed by a query line", nao);
} else {
obj_t *limit = or2(if2(nump(first(vals)), first(vals)),
if2(nump(second(vals)), second(vals)));
obj_t *sep = or2(if2(stringp(first(vals)), first(vals)),
if2(stringp(second(vals)), second(vals)));
obj_t *ff_specline = rest(first(spec));
obj_t *ff_dataline = lazy_str(data, sep, limit);
cons_bind (new_bindings, success,
match_line(bindings, ff_specline, ff_dataline, zero,
spec_linenum, num(data_lineno), first(files)));
if (!success) {
debuglf(spec_linenum, "freeform match failure", nao);
return nil;
}
if (nump(success))
data = lazy_str_get_trailing_list(ff_dataline, success);
bindings = new_bindings;
}
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == block) {
obj_t *name = first(rest(first_spec));
if (rest(specline))
sem_error(spec_linenum,
"unexpected material after block directive", nao);
if ((spec = rest(spec)) == nil)
break;
{
uw_block_begin(name, result);
result = match_files(spec, files, bindings, data, num(data_lineno));
uw_block_end;
return result;
}
} else if (sym == fail || sym == accept) {
obj_t *target = first(rest(first_spec));
if (rest(specline))
sem_error(spec_linenum, "unexpected material after ~a", sym, nao);
uw_block_return(target,
if2(sym == accept,
cons(bindings,
if3(data, cons(data, num(data_lineno)), t))));
/* TODO: uw_block_return could just throw this */
if (target)
sem_error(spec_linenum, "~a: no block named ~a in scope",
sym, target, nao);
else
sem_error(spec_linenum, "%~a: no anonymous block in scope", sym, nao);
return nil;
} else if (sym == next) {
if (rest(first_spec) && rest(specline))
sem_error(spec_linenum,
"invalid combination of old and new next syntax", nao);
if ((spec = rest(spec)) == nil)
break;
if (rest(first_spec)) {
obj_t *source = rest(first_spec);
if (eq(first(source), nothrow))
push(nil, &source);
else if (eq(first(source), args)) {
obj_t *input_name = string("args");
cons_bind (new_bindings, success,
match_files(spec, cons(input_name, files),
bindings, files, one));
if (success)
return cons(new_bindings,
if3(data, cons(data, num(data_lineno)), t));
return nil;
}
{
obj_t *val = eval_form(first(source), bindings);
obj_t *name = cdr(val);
if (!val)
sem_error(spec_linenum, "next: unbound variable in form ~a",
first(source), nao);
if (eq(second(source), nothrow)) {
if (name) {
files = cons(cons(nothrow, name), files);
} else {
files = rest(files);
if (!files) {
debuglf(spec_linenum, "next: out of arguments", nao);
return nil;
}
files = cons(cons(nothrow, first(files)), rest(files));
}
} else {
if (name) {
files = cons(name, files);
} else {
files = rest(files);
if (!files)
sem_error(spec_linenum, "next: out of arguments", nao);
files = cons(cons(nothrow, first(files)), rest(files));
}
}
}
} else if (rest(specline)) {
obj_t *sub = subst_vars(rest(specline), bindings);
obj_t *str = cat_str(sub, nil);
if (str == nil) {
sem_error(spec_linenum, "bad substitution in next file spec", nao);
continue;
}
files = cons(cons(nothrow, str), files);
} else {
files = rest(files);
if (!files)
sem_error(spec_linenum, "next: out of arguments", nao);
}
/* We recursively process the file list, but the new
data position we return to the caller must be in the
original file we we were called with. Hence, we can't
make a straight tail call here. */
{
cons_bind (new_bindings, success,
match_files(spec, files, bindings, t, nil));
if (success)
return cons(new_bindings,
if3(data, cons(data, num(data_lineno)), t));
return nil;
}
} else if (sym == some || sym == all || sym == none || sym == maybe ||
sym == cases)
{
obj_t *specs;
obj_t *all_match = t;
obj_t *some_match = nil;
obj_t *max_line = zero;
obj_t *max_data = nil;
for (specs = rest(first_spec); specs != nil; specs = rest(specs))
{
obj_t *nested_spec = first(specs);
obj_t *data_linenum = num(data_lineno);
cons_bind (new_bindings, success,
match_files(nested_spec, files, bindings,
data, data_linenum));
if (success) {
bindings = new_bindings;
some_match = t;
if (success == t) {
max_data = t;
} else if (consp(success) && max_data != t) {
cons_bind (new_data, new_line, success);
if (gt(new_line, max_line)) {
max_line = new_line;
max_data = new_data;
}
}
if (sym == cases)
break;
} else {
all_match = nil;
}
}
if (sym == all && !all_match) {
debuglf(spec_linenum, "all: some clauses didn't match", nao);
return nil;
}
if ((sym == some || sym == cases) && !some_match) {
debuglf(spec_linenum, "some/cases: no clauses matched", nao);
return nil;
}
if (sym == none && some_match) {
debuglf(spec_linenum, "none: some clauses matched", nao);
return nil;
}
/* No check for maybe, since it always succeeds. */
if (consp(max_data)) {
data_lineno = c_num(max_line);
data = max_data;
} else if (max_data == t) {
data = nil;
}
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == collect) {
obj_t *coll_spec = second(first_spec);
obj_t *until_spec = third(first_spec);
obj_t *bindings_coll = nil;
obj_t *iter;
uw_block_begin(nil, result);
result = t;
while (data) {
cons_bind (new_bindings, success,
match_files(coll_spec, files, bindings,
data, num(data_lineno)));
/* Until clause sees un-collated bindings from collect. */
if (until_spec)
{
cons_bind (discarded_bindings, success,
match_files(until_spec, files, new_bindings,
data, num(data_lineno)));
if (success) {
(void) discarded_bindings;
break;
}
}
if (success) {
debuglcf(spec_linenum, "collect matched %s:%ld",
c_str(first(files)), data_lineno);
for (iter = new_bindings; iter && iter != bindings;
iter = cdr(iter))
{
obj_t *binding = car(iter);
obj_t *existing = assoc(bindings_coll, car(binding));
bindings_coll = acons_new(bindings_coll, car(binding),
cons(cdr(binding), cdr(existing)));
}
}
if (success) {
if (consp(success)) {
cons_bind (new_data, new_line, success);
long new_lineno = c_num(new_line);
bug_unless (new_lineno >= data_lineno);
if (new_lineno == data_lineno) {
new_data = cdr(new_data);
new_lineno++;
}
debuglcf(spec_linenum,
"collect advancing from line %ld to %ld",
data_lineno, new_lineno);
data = new_data;
data_lineno = new_lineno;
} else {
debuglf(spec_linenum, "collect consumed entire file", nao);
data = nil;
}
} else {
data = rest(data);
data_lineno++;
}
}
uw_block_end;
if (!result) {
debuglf(spec_linenum, "collect explicitly failed", nao);
return nil;
}
if (!bindings_coll) {
debuglf(spec_linenum, "nothing was collected", nao);
return nil;
}
for (iter = bindings_coll; iter; iter = cdr(iter)) {
obj_t *pair = car(iter);
obj_t *rev = cons(car(pair), nreverse(cdr(pair)));
bindings = cons(rev, bindings);
}
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == flattn) {
obj_t *iter;
for (iter = rest(first_spec); iter; iter = rest(iter)) {
obj_t *sym = first(iter);
if (!symbolp(sym)) {
sem_error(spec_linenum, "non-symbol in flatten directive", nao);
} else {
obj_t *existing = assoc(bindings, sym);
if (existing)
*cdr_l(existing) = flatten(cdr(existing));
}
}
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == forget || sym == local) {
bindings = alist_remove(bindings, rest(first_spec));
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == mrge) {
obj_t *target = first(rest(first_spec));
obj_t *args = rest(rest(first_spec));
obj_t *merged = nil;
if (!target || !symbolp(target))
sem_error(spec_linenum, "bad merge directive", nao);
for (; args; args = rest(args)) {
obj_t *other_sym = first(args);
if (other_sym) {
obj_t *other_lookup = assoc(bindings, other_sym);
if (!symbolp(other_sym))
sem_error(spec_linenum, "non-symbol in merge directive", nao);
else if (!other_lookup)
sem_error(spec_linenum, "merge: nonexistent symbol ~a",
other_sym, nao);
if (merged)
merged = weird_merge(merged, cdr(other_lookup));
else
merged = cdr(other_lookup);
}
}
bindings = acons_new(bindings, target, merged);
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == bind) {
obj_t *args = rest(first_spec);
obj_t *pattern = first(args);
obj_t *form = second(args);
obj_t *val = eval_form(form, bindings);
if (!val)
sem_error(spec_linenum, "bind: unbound variable on right side", nao);
bindings = dest_bind(bindings, pattern, cdr(val));
if (bindings == t)
return nil;
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == cat) {
obj_t *iter;
for (iter = rest(first_spec); iter; iter = rest(iter)) {
obj_t *sym = first(iter);
if (!symbolp(sym)) {
sem_error(spec_linenum, "non-symbol in cat directive", nao);
} else {
obj_t *existing = assoc(bindings, sym);
obj_t *sep = nil;
if (rest(specline)) {
obj_t *sub = subst_vars(rest(specline), bindings);
sep = cat_str(sub, nil);
}
if (existing)
*cdr_l(existing) = cat_str(flatten(cdr(existing)), sep);
}
}
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == output) {
obj_t *specs = second(first_spec);
obj_t *old_style_dest = third(first_spec);
obj_t *new_style_dest = fourth(first_spec);
obj_t *nt = nil;
obj_t *dest;
if (old_style_dest) {
dest = cat_str(subst_vars(old_style_dest, bindings), nil);
} else {
if (eq(first(new_style_dest), nothrow))
push(nil, &new_style_dest);
{
obj_t *form = first(new_style_dest);
obj_t *val = eval_form(form, bindings);
if (!val)
sem_error(spec_linenum, "output: unbound variable in form ~a",
form, nao);
nt = eq(second(new_style_dest), nothrow);
dest = or2(cdr(val), string("-"));
}
}
fpip_t fp = (errno = 0, complex_open(dest, t));
debugf("opening data sink ~a", dest, nao);
if (complex_open_failed(fp)) {
if (nt) {
debugf("could not open ~a: treating as failed match due to nothrow",
dest, nao);
return nil;
} else if (errno != 0) {
file_err(nil, "could not open ~a (error ~a/~a)", dest,
num(errno), string(strerror(errno)), nao);
} else {
file_err(nil, "could not open ~a", dest, nao);
}
} else {
do_output(bindings, specs, fp.f);
complex_close(fp);
}
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == define) {
obj_t *args = second(first_spec);
obj_t *body = third(first_spec);
obj_t *name = first(args);
obj_t *params = second(args);
if (rest(specline))
sem_error(spec_linenum, "unexpected material after define", nao);
uw_set_func(name, cons(params, body));
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == try) {
obj_t *catch_syms = second(first_spec);
obj_t *try_clause = third(first_spec);
obj_t *catch_fin = fourth(first_spec);
obj_t *finally_clause = nil;
{
uw_block_begin(nil, result);
uw_catch_begin(catch_syms, exsym, exvals);
{
result = match_files(try_clause, files, bindings,
data, num(data_lineno));
uw_do_unwind;
}
uw_catch(exsym, exvals) {
{
obj_t *iter;
for (iter = catch_fin; iter; iter = cdr(iter)) {
obj_t *clause = car(iter);
obj_t *type = first(second(clause));
obj_t *params = second(second(clause));
obj_t *body = third(clause);
obj_t *vals = if3(listp(exvals),
exvals,
cons(cons(t, exvals), nil));
if (first(clause) == catch) {
if (uw_exception_subtype_p(exsym, type)) {
obj_t *all_bind = t;
obj_t *piter, *viter;
for (piter = params, viter = vals;
piter && viter;
piter = cdr(piter), viter = cdr(viter))
{
obj_t *param = car(piter);
obj_t *val = car(viter);
if (val) {
bindings = dest_bind(bindings, param, cdr(val));
if (bindings == t) {
all_bind = nil;
break;
}
}
}
if (all_bind) {
cons_bind (new_bindings, success,
match_files(body, files, bindings,
data, num(data_lineno)));
if (success) {
bindings = new_bindings;
result = t; /* catch succeeded, so try succeeds */
if (consp(success)) {
data = car(success);
data_lineno = c_num(cdr(success));
} else {
data = nil;
}
}
}
break;
}
} else if (car(clause) == finally) {
finally_clause = body;
}
}
}
uw_do_unwind;
}
uw_unwind {
obj_t *iter;
/* result may be t, from catch above. */
if (consp(result)) {
/* We process it before finally, as part of the unwinding, so
finally can accumulate more bindings over top of any bindings
produced by the main clause. */
cons_bind (new_bindings, success, result);
if (consp(success)) {
data = car(success);
data_lineno = c_num(cdr(success));
} else {
data = nil;
}
bindings = new_bindings;
}
if (!finally_clause) {
for (iter = catch_fin; iter; iter = cdr(iter)) {
obj_t *clause = car(iter);
if (first(clause) == finally) {
finally_clause = third(clause);
break;
}
}
}
if (finally_clause) {
cons_bind (new_bindings, success,
match_files(finally_clause, files, bindings,
data, num(data_lineno)));
if (success) {
bindings = new_bindings;
result = t; /* finally succeeds, so try block succeeds */
if (consp(success)) {
data = car(success);
data_lineno = c_num(cdr(success));
} else {
data = nil;
}
}
}
}
uw_catch_end;
uw_block_end;
if (!result)
return nil;
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
}
} else if (sym == defex) {
obj_t *types = rest(first_spec);
if (!all_satisfy(types, func_n1(symbolp), nil))
sem_error(spec_linenum, "defex arguments must all be symbols", nao);
(void) reduce_left(func_n2(uw_register_subtype), types, nil, nil);
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
} else if (sym == throw) {
obj_t *type = second(first_spec);
obj_t *args = rest(rest(first_spec));
if (!symbolp(type))
sem_error(spec_linenum, "throw: ~a is not a type symbol",
first(first_spec), nao);
{
obj_t *values = mapcar(bind2other(func_n2(eval_form), bindings),
args);
uw_throw(type, values);
}
} else {
obj_t *func = uw_get_func(sym);
if (func) {
obj_t *args = rest(first_spec);
obj_t *params = car(func);
obj_t *ub_p_a_pairs = nil;
obj_t *body = cdr(func);
obj_t *piter, *aiter;
obj_t *bindings_cp = copy_alist(bindings);
if (!equal(length(args), length(params)))
sem_error(spec_linenum, "function ~a takes ~a argument(s)",
sym, length(params), nao);
for (piter = params, aiter = args; piter;
piter = cdr(piter), aiter = cdr(aiter))
{
obj_t *param = car(piter);
obj_t *arg = car(aiter);
if (arg && symbolp(arg)) {
obj_t *val = eval_form(arg, bindings);
if (val) {
bindings_cp = acons_new(bindings_cp,
param,
cdr(val));
} else {
bindings_cp = alist_remove1(bindings_cp, param);
ub_p_a_pairs = cons(cons(param, arg), ub_p_a_pairs);
}
} else {
obj_t *val = eval_form(arg, bindings);
if (!val)
sem_error(spec_linenum,
"unbound variable in function argument form", nao);
bindings_cp = acons_new(bindings_cp, param, cdr(val));
}
}
{
uw_block_begin(nil, result);
uw_env_begin;
result = match_files(body, files, bindings_cp,
data, num(data_lineno));
uw_env_end;
uw_block_end;
if (!result) {
debuglf(spec_linenum, "function failed", nao);
return nil;
}
{
cons_bind (new_bindings, success, result);
for (piter = ub_p_a_pairs; piter; piter = cdr(aiter))
{
cons_bind (param, arg, car(piter));
if (symbolp(arg)) {
obj_t *newbind = assoc(new_bindings, param);
if (newbind) {
bindings = dest_bind(bindings, arg, cdr(newbind));
if (bindings == t) {
debuglf(spec_linenum, "binding mismatch on ~a "
"when returning from ~a", arg, sym, nao);
return nil;
}
}
}
}
if (consp(success)) {
debuglcf(spec_linenum,
"function matched; advancing from line %ld to %ld",
data_lineno, c_num(cdr(success)));
data = car(success);
data_lineno = c_num(cdr(success));
} else {
debuglf(spec_linenum, "function consumed entire file", nao);
data = nil;
}
}
}
if ((spec = rest(spec)) == nil)
break;
goto repeat_spec_same_data;
}
}
}
if (dataline == nil)
return nil;
{
cons_bind (new_bindings, success,
match_line(bindings, specline, dataline, zero,
spec_linenum, num(data_lineno), first(files)));
if (nump(success) && c_num(success) < c_num(length_str(dataline))) {
debuglf(spec_linenum, "spec only matches line to position ~a: ~a",
success, dataline, nao);
return nil;
}
if (!success)
return nil;
bindings = new_bindings;
}
}
return cons(bindings, if3(data, cons(data, num(data_lineno)), t));
}
int extract(obj_t *spec, obj_t *files, obj_t *predefined_bindings)
{
cons_bind (bindings, success, match_files(spec, files, predefined_bindings,
t, nil));
if (!output_produced) {
if (!opt_nobindings) {
if (bindings) {
bindings = nreverse(bindings);
dump_bindings(bindings);
}
}
if (!success)
puts("false");
}
return success ? 0 : EXIT_FAILURE;
}