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/* notmuch - Not much of an email program, (just index and search)
*
* Copyright © 2012 Peter Feigl
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see http://www.gnu.org/licenses/ .
*
* Author: Peter Feigl <peter.feigl@gmx.at>
*/
#include <stdbool.h>
#include <stdio.h>
#include <talloc.h>
#include "sprinter.h"
#include <ctype.h>
struct sprinter_sexp {
struct sprinter vtable;
FILE *stream;
/* Top of the state stack, or NULL if the printer is not currently
* inside any aggregate types. */
struct sexp_state *state;
/* A flag to signify that a separator should be inserted in the
* output as soon as possible. */
notmuch_bool_t insert_separator;
};
struct sexp_state {
struct sexp_state *parent;
/* True if nothing has been printed in this aggregate yet.
* Suppresses the space before a value. */
notmuch_bool_t first;
};
/* Helper function to set up the stream to print a value. If this
* value follows another value, prints a space. */
static struct sprinter_sexp *
sexp_begin_value (struct sprinter *sp)
{
struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;
if (sps->state) {
if (! sps->state->first) {
if (sps->insert_separator) {
fputc ('\n', sps->stream);
sps->insert_separator = FALSE;
} else {
fputc (' ', sps->stream);
}
} else {
sps->state->first = FALSE;
}
}
return sps;
}
/* Helper function to begin an aggregate type. Prints the open
* character and pushes a new state frame. */
static void
sexp_begin_aggregate (struct sprinter *sp)
{
struct sprinter_sexp *sps = sexp_begin_value (sp);
struct sexp_state *state = talloc (sps, struct sexp_state);
fputc ('(', sps->stream);
state->parent = sps->state;
state->first = TRUE;
sps->state = state;
}
static void
sexp_begin_map (struct sprinter *sp)
{
sexp_begin_aggregate (sp);
}
static void
sexp_begin_list (struct sprinter *sp)
{
sexp_begin_aggregate (sp);
}
static void
sexp_end (struct sprinter *sp)
{
struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;
struct sexp_state *state = sps->state;
fputc (')', sps->stream);
sps->state = state->parent;
talloc_free (state);
if (sps->state == NULL)
fputc ('\n', sps->stream);
}
static void
sexp_string_len (struct sprinter *sp, const char *val, size_t len)
{
/* Some characters need escaping. " and \ work fine in all Lisps,
* \n is not supported in CL, but all others work fine.
* Characters below 32 are printed as \123o (three-digit
* octals), which work fine in most Schemes and Emacs. */
static const char *const escapes[] = {
['\"'] = "\\\"", ['\\'] = "\\\\", ['\n'] = "\\n"
};
struct sprinter_sexp *sps = sexp_begin_value (sp);
fputc ('"', sps->stream);
for (; len; ++val, --len) {
unsigned char ch = *val;
if (ch < ARRAY_SIZE (escapes) && escapes[ch])
fputs (escapes[ch], sps->stream);
else if (ch >= 32)
fputc (ch, sps->stream);
else
fprintf (sps->stream, "\\%03o", ch);
}
fputc ('"', sps->stream);
}
static void
sexp_string (struct sprinter *sp, const char *val)
{
if (val == NULL)
val = "";
sexp_string_len (sp, val, strlen (val));
}
/* Prints a symbol, i.e. the name preceded by a colon. This should work
* in all Lisps, at least as a symbol, if not as a proper keyword */
static void
sexp_keyword (struct sprinter *sp, const char *val)
{
unsigned int i = 0;
struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;
char ch;
if (val == NULL)
INTERNAL_ERROR ("illegal symbol NULL");
for (i = 0; i < strlen (val); i++) {
ch = val[i];
if (! (isalnum (ch) || (ch == '-') || (ch == '_'))) {
INTERNAL_ERROR ("illegal character in symbol %s: %c", val, ch);
}
}
fputc (':', sps->stream);
fputs (val, sps->stream);
}
static void
sexp_integer (struct sprinter *sp, int val)
{
struct sprinter_sexp *sps = sexp_begin_value (sp);
fprintf (sps->stream, "%d", val);
}
static void
sexp_boolean (struct sprinter *sp, notmuch_bool_t val)
{
struct sprinter_sexp *sps = sexp_begin_value (sp);
fputs (val ? "t" : "nil", sps->stream);
}
static void
sexp_null (struct sprinter *sp)
{
struct sprinter_sexp *sps = sexp_begin_value (sp);
fputs ("nil", sps->stream);
}
static void
sexp_map_key (struct sprinter *sp, const char *key)
{
sexp_begin_value (sp);
sexp_keyword (sp, key);
}
static void
sexp_set_prefix (unused (struct sprinter *sp), unused (const char *name))
{
}
static void
sexp_separator (struct sprinter *sp)
{
struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;
sps->insert_separator = TRUE;
}
struct sprinter *
sprinter_sexp_create (const void *ctx, FILE *stream)
{
static const struct sprinter_sexp template = {
.vtable = {
.begin_map = sexp_begin_map,
.begin_list = sexp_begin_list,
.end = sexp_end,
.string = sexp_string,
.string_len = sexp_string_len,
.integer = sexp_integer,
.boolean = sexp_boolean,
.null = sexp_null,
.map_key = sexp_map_key,
.separator = sexp_separator,
.set_prefix = sexp_set_prefix,
.is_text_printer = FALSE,
}
};
struct sprinter_sexp *res;
res = talloc (ctx, struct sprinter_sexp);
if (! res)
return NULL;
*res = template;
res->stream = stream;
return &res->vtable;
}
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