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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "Tokenizer.hxx"
#include "CharUtil.hxx"
#include "StringUtil.hxx"
#include "Error.hxx"
#include "Domain.hxx"
static constexpr Domain tokenizer_domain("tokenizer");
static inline bool
valid_word_first_char(char ch)
{
return IsAlphaASCII(ch);
}
static inline bool
valid_word_char(char ch)
{
return IsAlphaNumericASCII(ch) || ch == '_';
}
char *
Tokenizer::NextWord(Error &error)
{
char *const word = input;
if (*input == 0)
return nullptr;
/* check the first character */
if (!valid_word_first_char(*input)) {
error.Set(tokenizer_domain, "Letter expected");
return nullptr;
}
/* now iterate over the other characters until we find a
whitespace or end-of-string */
while (*++input != 0) {
if (IsWhitespaceOrNull(*input)) {
/* a whitespace: the word ends here */
*input = 0;
/* skip all following spaces, too */
input = strchug_fast(input + 1);
break;
}
if (!valid_word_char(*input)) {
error.Set(tokenizer_domain, "Invalid word character");
return nullptr;
}
}
/* end of string: the string is already null-terminated
here */
return word;
}
static inline bool
valid_unquoted_char(char ch)
{
return (unsigned char)ch > 0x20 && ch != '"' && ch != '\'';
}
char *
Tokenizer::NextUnquoted(Error &error)
{
char *const word = input;
if (*input == 0)
return nullptr;
/* check the first character */
if (!valid_unquoted_char(*input)) {
error.Set(tokenizer_domain, "Invalid unquoted character");
return nullptr;
}
/* now iterate over the other characters until we find a
whitespace or end-of-string */
while (*++input != 0) {
if (IsWhitespaceOrNull(*input)) {
/* a whitespace: the word ends here */
*input = 0;
/* skip all following spaces, too */
input = strchug_fast(input + 1);
break;
}
if (!valid_unquoted_char(*input)) {
error.Set(tokenizer_domain,
"Invalid unquoted character");
return nullptr;
}
}
/* end of string: the string is already null-terminated
here */
return word;
}
char *
Tokenizer::NextString(Error &error)
{
char *const word = input, *dest = input;
if (*input == 0)
/* end of line */
return nullptr;
/* check for the opening " */
if (*input != '"') {
error.Set(tokenizer_domain, "'\"' expected");
return nullptr;
}
++input;
/* copy all characters */
while (*input != '"') {
if (*input == '\\')
/* the backslash escapes the following
character */
++input;
if (*input == 0) {
/* return input-1 so the caller can see the
difference between "end of line" and
"error" */
--input;
error.Set(tokenizer_domain, "Missing closing '\"'");
return nullptr;
}
/* copy one character */
*dest++ = *input++;
}
/* the following character must be a whitespace (or end of
line) */
++input;
if (!IsWhitespaceOrNull(*input)) {
error.Set(tokenizer_domain,
"Space expected after closing '\"'");
return nullptr;
}
/* finish the string and return it */
*dest = 0;
input = strchug_fast(input);
return word;
}
char *
Tokenizer::NextParam(Error &error)
{
if (*input == '"')
return NextString(error);
else
return NextUnquoted(error);
}
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