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/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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 <https://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "libknot/yparser/yparser.h"
#include "libknot/errcode.h"
%%{
machine yparser;
access parser->;
# Newline processing.
action _newline_init {
// Return if key without value.
if (parser->event != YP_ENULL && !parser->processed) {
parser->processed = true;
found = true;
fbreak;
}
}
action _newline {
parser->line_count++;
parser->event = YP_ENULL;
parser->processed = false;
}
newline_char = '\n' >_newline_init %_newline %!_newline | '\r';
# Comment processing.
comment_char = '#';
comment = comment_char . (^newline_char)*;
# White space processing.
sep_char = ' ';
sep = sep_char+;
action _blank_exit {
indent = 0;
id_pos = 0;
}
blank = ( sep? . comment? ) . newline_char %_blank_exit;
rest = ((sep :> comment) | sep?) . newline_char;
# Data processing.
action _item_data_init {
parser->data_len = 0;
}
action _item_data {
if (parser->data_len >= sizeof(parser->data) - 1) {
return KNOT_ESPACE;
}
parser->data[parser->data_len++] = fc;
}
action _item_unbackslash {
parser->data_len--;
}
action _item_data_exit {
// Return if a value parsed.
parser->data[parser->data_len] = '\0';
parser->processed = true;
found = true;
fbreak;
}
backslash_char = '\\';
quote_char = '\"';
list_char = [\[,\]];
data_char =
( (ascii - space - cntrl - quote_char - sep_char -
comment_char - list_char - backslash_char)
| (backslash_char . (quote_char) >_item_unbackslash)
| (backslash_char . (32..126 - quote_char))
) $_item_data;
data_str_char =
( (data_char)
| (sep_char | comment_char | list_char) $_item_data
);
data_str = (quote_char . data_str_char* <: quote_char);
item_data = (data_char+ | data_str) >_item_data_init %_item_data_exit;
item_data_plus = item_data . ((sep? . ',' . sep?) . item_data)*;
item_data_list = '\[' . sep? . item_data_plus . sep? . '\]';
# Key processing.
action _key_init {
if (indent > 0 && parser->indent > 0 &&
indent != parser->indent) {
return KNOT_YP_EINVAL_INDENT;
}
parser->processed = false;
parser->key_len = 0;
parser->data_len = 0;
parser->event = YP_ENULL;
}
action _key {
if (parser->key_len >= sizeof(parser->key) - 1) {
return KNOT_ESPACE;
}
parser->key[parser->key_len++] = fc;
}
action _key0_exit {
parser->key[parser->key_len] = '\0';
parser->indent = 0;
parser->id_pos = 0;
parser->event = YP_EKEY0;
}
action _key1_exit {
parser->key[parser->key_len] = '\0';
parser->indent = indent;
parser->event = YP_EKEY1;
}
action _id_exit {
parser->key[parser->key_len] = '\0';
parser->indent = indent;
parser->id_pos = id_pos;
parser->event = YP_EID;
}
action _indent {
indent++;
}
action _id {
id_pos++;
}
action _dash_init {
if (id_pos > 0 && parser->id_pos > 0 &&
id_pos != parser->id_pos) {
return KNOT_YP_EINVAL_INDENT;
}
parser->indent = 0;
}
key_name = ((alnum | [\\.]) . (alnum | [\\.\-])*) >_key_init $_key;
key0 = key_name %_key0_exit;
key1 = sep $_indent . key_name %_key1_exit;
id = ((sep $_id)? . '-' >_dash_init . sep) $_indent . key_name %_id_exit;
item = (((key0 . sep? . ':' . (sep . (item_data_list | item_data))?)
|(key1 . sep? . ':' . (sep . (item_data_list | item_data))?)
|(id . sep? . ':' . sep . item_data)
) . rest
);
# Main processing loop.
action _error {
switch (fc) {
case '\t':
return KNOT_YP_ECHAR_TAB;
default:
return KNOT_EPARSEFAIL;
}
}
main := (blank | item)* $!_error;
}%%
// Include parser static data (Ragel internals).
%% write data;
int _yp_start_state = %%{ write start; }%%;
int _yp_parse(
yp_parser_t *parser)
{
// Parser input limits (Ragel internals).
const char *p, *pe, *eof;
// Current item indent.
size_t indent = 0;
// Current id dash position.
size_t id_pos = 0;
// Indicates if the current parsing step contains an item.
bool found = false;
if (!parser->input.eof) { // Restore parser input limits.
p = parser->input.current;
pe = parser->input.end;
eof = NULL;
} else { // Set the last artificial block with just one new line char.
p = "\n";
pe = p + 1;
eof = pe;
}
// Include parser body.
%% write exec;
// Store the current parser position.
if (!parser->input.eof) {
parser->input.current = p;
} else {
parser->input.current = parser->input.end;
}
// Check for general parser error.
if (parser->cs == %%{ write error; }%%) {
return KNOT_EPARSEFAIL;
}
// Check if parsed an item.
if (found) {
return KNOT_EOK;
} else {
return KNOT_EFEWDATA;
}
}
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