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/*
# encoding.c: read a font encoding (.enc) file.
#
# Copyright (C) 1992, 2011 Free Software Foundation, Inc.
#
# 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/>.
#
*/
#include "config.h"
#include "encoding.h"
#include "libfile.h"
#include "str-lcase.h"
#include "tfm.h"
static encoding_char_type parse_encoding_line (string);
static tfm_ligature_type parse_ligature (void);
/* Look through INFO for NAME. */
int
encoding_number (encoding_info_type info, string name)
{
unsigned code;
if (name == NULL)
return -1;
for (code = 0; code <= MAX_CHARCODE; code++)
if (ENCODING_CHAR_NAME (info, code) != NULL
&& STREQ (ENCODING_CHAR_NAME (info, code), name))
return code;
return -1;
}
/* Return the basename for the encoding file in which the encoding
CODING_SCHEME can be found. If we can't find CODING_SCHEME, return
DEFAULT_ENCODING. */
string
coding_scheme_to_filename (string coding_scheme)
{
string mapping_line, enc_name;
string lc_coding_scheme = str_to_lower (coding_scheme);
libfile_start ("encoding", "map");
while ((mapping_line = libfile_line ()) != NULL)
{
string test_coding_scheme, lc_test_coding_scheme;
enc_name = strtok (mapping_line, " \t");
test_coding_scheme = strtok (NULL, "\t");
lc_test_coding_scheme = str_to_lower (test_coding_scheme);
if (STREQ (lc_coding_scheme, lc_test_coding_scheme))
break;
free (lc_test_coding_scheme);
free (mapping_line);
}
libfile_close ();
if (mapping_line == NULL)
{
WARNING3 ("%s: unknown encoding `%s'; using default `%s'",
"encoding.map", coding_scheme, DEFAULT_ENCODING);
enc_name = DEFAULT_ENCODING;
}
free (lc_coding_scheme);
return enc_name;
}
/* Parse the encoding file `FILENAME.enc' and return a structure
describing what we read. If the file doesn't exist, give a fatal
error. */
encoding_info_type
read_encoding_file (string filename)
{
encoding_info_type info;
string line;
unsigned code;
/* Prepare to read from FILENAME. */
libfile_start (filename, "enc");
/* Start with an empty encoding. */
for (code = 0; code <= MAX_CHARCODE; code++)
ENCODING_CHAR_NAME (info, code) = NULL;
/* The entire first line is the TFM `CODINGSCHEME'. */
ENCODING_SCHEME_NAME (info) = libfile_line ();
/* Each remaining line defines one character. */
code = 0;
while ((line = libfile_line ()) != NULL)
{
ENCODING_CHAR_ELT (info, code) = parse_encoding_line (line);
code++;
free (line);
}
return info;
}
/* Parse one line of the encoding file; this specifies one character.
The BNF is:
<line> ::= <word> <ligatures>
<ligatures> ::= <ligature> [<ligature>]?
| <empty>
<ligature> ::= lig <charcode> =: <charcode>
Whitespace must be between all elements.
If the line is malformed, we give a fatal error. */
#define WORD_SEPARATOR " \t"
#define GET_WORD() strtok (NULL, WORD_SEPARATOR)
static encoding_char_type
parse_encoding_line (string line)
{
encoding_char_type c;
c.name = xstrdup (strtok (line, WORD_SEPARATOR));
c.ligature = list_init ();
do
{
tfm_ligature_type *lig;
string t = GET_WORD ();
if (t == NULL) /* Do we have more ligature specs? */
break;
if (!STREQ (t, "lig"))
LIBFILE_ERROR1 ("Expected `lig', found `%s'", t);
lig = LIST_TAPPEND (&c.ligature, tfm_ligature_type);
*lig = parse_ligature ();
}
while (true);
return c;
}
/* Parse a single ligature: <charcode> =: <charcode>. */
static tfm_ligature_type
parse_ligature ()
{
tfm_ligature_type lig;
boolean valid;
string t = GET_WORD ();
lig.character = parse_charcode (t, &valid);
if (!valid)
LIBFILE_ERROR1 ("Invalid right character code `%s'", t);
t = GET_WORD ();
if (!STREQ (t, "=:"))
LIBFILE_ERROR1 ("Expected `=:', found `%s'", t);
t = GET_WORD ();
lig.ligature = parse_charcode (t, &valid);
if (!valid)
LIBFILE_ERROR1 ("Invalid ligature character code `%s'", t);
return lig;
}
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