diff options
Diffstat (limited to 'src/parser.c')
| -rw-r--r-- | src/parser.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/src/parser.c b/src/parser.c new file mode 100644 index 0000000..fa8d94d --- /dev/null +++ b/src/parser.c @@ -0,0 +1,319 @@ +/* + * Copyright (C) 2013-2014 Intel Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * Authors: + * José Bollo <jose.bollo@open.eurogiciel.org> + * Stéphane Desneux <stephane.desneux@open.eurogiciel.org> + * Jean-Benoit Martin <jean-benoit.martin@open.eurogiciel.org> + * + */ +#define _GNU_SOURCE + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdlib.h> +#include <alloca.h> +#include <ctype.h> + +#include "parser.h" + +#ifndef MINIMUM_DATA_SIZE +# define MINIMUM_DATA_SIZE 128 +#endif +#ifndef DEFAULT_MAXIMUM_DATA_SIZE +# define DEFAULT_MAXIMUM_DATA_SIZE 32768 +#endif + +#ifndef _ +# define _(x) x +#endif + +int parse_utf8_config( struct parsing *parsing) +{ + char c, q, acc, overflow, escape; + char *bdata; + const char *value, *head, *end, *skey, *svar, *bvar; + size_t lkey, lvar, ldata, datasz; + int errors; + +#define iskeybeg(x) (isalpha(x)||(x)=='_') +#define iskey(x) (isalnum(x)||(x)=='_') +#define atend ((head-end) >= 0) + +#define pos(x) ((size_t)((x)-parsing->buffer)) +#define error(p,x) do{ errors++; \ + if(parsing->error \ + && !parsing->error(parsing,pos(p),x)) \ + goto stop; \ + }while(0) + + /* alloc data buffer */ + datasz = parsing->maximum_data_size; + if (datasz == 0) + datasz = DEFAULT_MAXIMUM_DATA_SIZE; + else if (datasz < MINIMUM_DATA_SIZE) + datasz = MINIMUM_DATA_SIZE; + bdata = alloca(datasz); + + /* init */ + escape = parsing->should_escape ? 1 : 0; + errors = 0; + head = parsing->buffer; + end = head + parsing->length; + goto initial; + +next_initial: + + head++; + +initial: /* expecting key, comment or ??? */ + + if (atend) + goto end_ok; + + c = *head; + + if (iskeybeg(c)) { + skey = head; + goto key; + } + + if (c == '#') + goto comment; + + if (!isspace(c)) + error(head,_("unexpected character while looking to a key start")); + + goto next_initial; + +comment: /* skipping a comment */ + + head++; + if (atend) + goto end_ok; + c = *head; + if (c == '\n') + goto next_initial; + goto comment; + +key: /* reading a key */ + + head++; + if (atend) { + error(head,_("end in a key")); + goto stop; + } + c = *head; + if (iskey(c)) + goto key; + if (c != '=') { + error(head,_("unexpected character while looking to =")); + goto next_initial; + } + lkey = head - skey; + overflow = ldata = 0; + q = 0; + goto next_value; + +escapable: + + if (escape && ldata < datasz) + bdata[ldata++] = '\\'; + +add_value: /* add the current char to data */ + + if (ldata < datasz) + bdata[ldata++] = c; + else + overflow = 1; + +next_value: + + head++; + +value: /* reading the value */ + + if (atend) { + /* end in the value */ + if (!q) + goto end_of_value; + + error(head,_("end in quoted value")); + goto stop; + } + + c = *head; + switch (c) { + + case '\\': + if (q == '\'') + goto escapable; + ++head; + if (atend) { + error(head,_("end after escape char")); + goto stop; + } + c = *head; + goto escapable; + + case '\'': + if (q == '"') + goto escapable; + q = q ^ c; + goto next_value; + + case '"': + if (q == '\'') + goto escapable; + q = q ^ c; + goto next_value; + + case '$': + if (q == '\'') + goto escapable; + + /* begin of a variable, just after $ */ + bvar = head++; + if (atend) { + error(head,_("end after $")); + goto stop; + } + c = *head; + acc = c; + if (c == '{') { + ++head; + if (atend) { + error(head,_("end after ${")); + goto stop; + } + c = *head; + } + if (!iskeybeg(c)) { + error(head,_("invalid character after $ or ${")); + goto value; + } + svar = head; + goto variable; + + default: + if (q || !isspace(c)) + goto add_value; + + goto end_of_value; + } + +end_of_value: /* end of the value */ + + if (overflow) + error(head,_("value too big")); + else if (parsing->put) + parsing->put( parsing, skey, lkey, bdata, ldata, pos(skey), pos(head)); + if (atend) + goto initial; + goto next_initial; + +variable: /* read a variable */ + + ++head; + if (atend) { + if (acc == '{') + error(head,_("unmatched pair { }")); + lvar = head - svar; + } + else { + c = *head; + if (iskey(c)) + goto variable; + lvar = head - svar; + if (acc == '{') { + if (c == '}') + ++head; + else + error(head,_("unmatched pair { }")); + } + } + if (parsing->get) { + value = parsing->get( parsing, svar,lvar,pos(bvar),pos(head)); + if (value == NULL) + error(bvar,_("no value for the variable")); + else { + while (*value) { + if (ldata < datasz) + bdata[ldata++] = *value++; + else { + overflow = 1; + break; + } + } + } + } + goto value; + +stop: +end_ok: + return -errors; + +#undef error +#undef pos +#undef atend +#undef iskey +#undef iskeybeg +} + +void parse_utf8_info( + struct parsing *parsing, + struct parsinfo *info, + size_t pos +) +{ + const char *buf, *begin, *end; + size_t length; + int lino, colno; + + /* init */ + lino = 1, colno = 1; + buf = begin = end = parsing->buffer; + length = parsing->length; + if (length < pos) + pos = length; + + /* search the begin of the line */ + while ((end - buf) != pos) { + /* dealing utf8 */ + colno += ((*end & '\xc0') != '\x80'); + /* dealing with lines */ + if(*end++ == '\n') { + begin = end; + lino++; + colno = 1; + } + } + + /* search the end of the line */ + while ((end - buf) < length && *end != '\n') + end++; + + /* record computed values */ + info->begin = begin; + info->end = end; + info->length = end - begin; + info->lino = lino; + info->colno = colno; +} + |