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/*** s_parse.c ****************************************************************
**
** This file is part of BibTool.
** It is distributed under the GNU General Public License.
** See the file COPYING for details.
**
** (c) 1996-2020 Gerd Neugebauer
**
** Net: gene@gerd-neugebauer.de
**
** 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**
******************************************************************************/
#include <bibtool/general.h>
#include <bibtool/symbols.h>
#include <bibtool/error.h>
#include <bibtool/parse.h>
#include <bibtool/s_parse.h>
#include <bibtool/type.h>
/*****************************************************************************/
/* Internal Programs */
/*===========================================================================*/
/*****************************************************************************/
/* External Programs */
/*===========================================================================*/
/*---------------------------------------------------------------------------*/
#define Error(E,S,A,B) \
if (E) error(ERR_ERROR|ERR_POINT, \
(String)A, \
(String)B, \
(String)0, \
sp_line == NULL ? S : sp_line, \
(String)S, \
0, \
(String)0)
static String unexpected = (String)"Unexpected "; /* */
static String expected = (String)" expected."; /* */
static String sp_line = StringNULL; /* */
/*-----------------------------------------------------------------------------
** Function: sp_open()
** Purpose: Open a string for parsing. The argument string is used
** for the parsing process. Thus this string should not
** be modified during this time. Especially it should
** not be freed if it is a pointer to dynamically
** allocated memory.
** Arguments:
** s String to open for parsing.
** Returns: nothing
**___________________________________________________ */
void sp_open(s) /* */
String s; /* */
{ sp_line = s; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: sp_close()
** Type: void
** Purpose: Release the string parser and rest it to its initial state.
** Arguments: none
** Returns: nothing
**___________________________________________________ */
void sp_close() /* */
{ /* */
sp_line = StringNULL; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: sp_eos()
** Type: Sting
** Purpose: The string is analyzed and any remaining characters which are
** not whitespace are reported as error. A pointer to the
** terminating 0 byte
** Arguments:
** sp the string pointer
** Returns:
**___________________________________________________ */
String sp_eos(sp) /* */
String *sp; /* */
{ register String s = *sp; /* */
/* */
while( is_space(*s) ) s++; /* */
*sp = s; /* */
/* */
if ( *s ) /* */
{ Error(-1, s, unexpected, /* */
"characters at end of string."); /* */
} /* */
/* */
sp_line = NULL; /* */
return (*s ? s : NULL); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: sp_skip()
** Type: void
** Purpose: Advance a String pointer to the next character which is not a
** white-space, equals or hash.
** Arguments:
** sp the string pointer
** Returns:
**___________________________________________________ */
void sp_skip(sp) /* */
register String *sp; /* */
{ register String s = *sp; /* */
while ( is_space(*s) /* */
|| *s == '=' /* */
|| *s == '#' ) s++; /* */
*sp = s; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: s_parse()
** Purpose: Parse a string for a certain entity. Leading
** whitespace is ignored. |type| determines which kind of
** entity should be expected. It can take the following
** values which are defined in |s_parse.h|:
** \begin{description}
** \item[StringParseValue] The string is analyzed and the
** proper type is determined automatically. This can be
** considered as the normal way of operation.
** \item[StringParseSymbol] The string is analyzed and
** only a symbol is accepted, i.e.\ a sequence of
** allowed characters.
** \item[StringParseNumber] The string is analyzed and
** only a number is accepted.
** \item[StringParseBraces] The string is analyzed and
** only an expression in braces is accepted. The braced
** contained must come in matching pairs. The whole
** expression -- including the braces -- is returned.
** \item[StringParseUnquotedBraces] The string is analyzed and
** only an expression in braces is accepted. The braced
** contained must come in matching pairs. The
** expression without the outer braces is returned.
** \item[StringParseString] The string is analyzed and
** only a string enclosed in double quotes is
** accepted. The string must contain braces in matching
** pairs. Double quotes which are inside of braces are
** not considered as end of the string. The whole
** string -- including the double quotes is returned.
** \item[StringParseUnquotedString] The string is analyzed and
** only a string enclosed in double quotes is
** accepted. The string must contain braces in matching
** pairs. Double quotes which are inside of braces are
** not considered as end of the string. The string
** without the outer double quotes is returned.
** \end{description}
** If an error occurs or the requested entity is not
** found then |NULL| is returned. As a side effect |sp|
** is advanced to point to the next unprocessed
** character.
**
** The string analyzed should be opened at the beginning
** with |sp_open()| in order to get an appropriate error
** message.
**
** This function is usually not called directly but the
** convenience macros defined in |s_parse.h| should be
** used instead.
** Arguments:
** type is the type of construct to parse. It is defined in s_parse.h
** sp is a pointer to the string which is parsed. The value is
** changed to hold the remaining characters at the end.
** errp this boolean indicated whether or not a verbose error
** message should be created in case of an error.
** Returns: A symbol containing the requested entity or |NULL|.
**___________________________________________________ */
Symbol s_parse(type, sp, errp) /* */
int type; /* */
String *sp; /* */
bool errp; /* */
{ register String s = *sp; /* */
Uchar c; /* */
String cp; /* */
/* */
DebugPrint2((type == StringParseNext ? "ParseNext ":
type == StringParseNumber ? "ParseNumber ":
type == StringParseSymbol ? "ParseSymbol ":
type == StringParseString ? "ParseString ":
type == StringParseUnquotedString ? "ParseUnquotedString ":
type == StringParseBraces ? "ParseBraces ":
type == StringParseUnquotedBraces ? "ParseUnquotedBraces ":
type == StringParseValue ? "ParseValue ":
"???"),s); /* */
while(is_space(*s)) s++; /* */
*sp = s; /* */
/* */
switch (type) /* */
{ case StringParseSymbol: /* */
if ( is_allowed(*s) && !is_digit(*s) ) /* */
{ do { s++; } while ( is_allowed(*s) ); /* */
} /* */
else /* */
{ Error(errp, s, "Symbol", expected); /* */
return NULL; /* */
} /* */
break; /* */
/* */
case StringParseNumber: /* */
if (is_digit(*s)) /* */
{ do { s++; } while ( is_digit(*s) ); /* */
} /* */
else /* */
{ Error(errp, s, "Number", expected); /* */
return NULL; /* */
} /* */
break; /* */
/* */
case StringParseBraces: /* */
case StringParseUnquotedBraces: /* */
if (*s != '{') /* */
{ Error(errp, s, "Brace", expected); /* */
return NULL; /* */
} /* */
s++; /* */
if (type == StringParseUnquotedBraces) /* */
{ *sp = s; } /* */
{ int level = 1; /* */
/* */
while ( *s && level > 0 ) /* */
{ /* */
switch ( *s ) /* */
{ case '{': level++; break; /* */
case '}': --level; break; /* */
case '"': /* */
s++; /* */
while (*s && *s != '"') /* */
{ if (*s != '\\' || *++s ) s++; /* */
} /* */
break; /* */
} /* */
if ( *s ) s++; /* */
} /* */
if (level > 0) /* */
{ Error(errp, s, unexpected, "end of braces.");/* */
} /* */
else if (type == StringParseUnquotedBraces)/* */
{ s--; } /* */
} /* */
break; /* */
/* */
case StringParseString: /* */
case StringParseUnquotedString: /* */
if ( *s != '"' ) /* */
{ Error(errp, s, "String", expected); /* */
return NULL; /* */
} /* */
s++; /* */
if ( type == StringParseUnquotedString ) /* */
{ *sp = s; } /* */
/* */
while ( *s && *s != '"' ) /* */
{ if ( *s == '\\' && *(s+1) != '\0' ) s += 2;/* */
else ++s; /* */
} /* */
/* */
if ( *s == '"' ) /* */
{ if (type != StringParseUnquotedString) s++;/* */
} /* */
else /* */
{ Error(errp, s, unexpected, "end of string.");/* */
} /* */
break; /* */
/* */
case StringParseValue: /* */
switch ( *s ) /* */
{ case '"': /* */
return s_parse(StringParseUnquotedString, sp, errp);/* */
case '{': /* */
return s_parse(StringParseUnquotedBraces, sp, errp);/* */
case '0': case '1': case '2': case '3': /* */
case '4': case '5': case '6': case '7': /* */
case '8': case '9': /* */
return s_parse(StringParseNumber, sp, errp);/* */
default: /* */
return s_parse(StringParseSymbol, sp, errp);/* */
} /* */
break; /* */
/* */
default: /* */
return NULL; /* */
} /* */
/* */
c = *s; /* */
*s = (Uchar)'\0'; /* */
cp = newString(*sp); /* */
*s = c; /* */
if ( type == StringParseUnquotedString /* */
|| type == StringParseUnquotedBraces ) s++; /* */
*sp = s; /* */
if (type == StringParseSymbol) /* */
{ (void)lower(cp); } /* */
/* */
{ Symbol sym = symbol(cp); /* */
free(cp); /* */
return sym; /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: sp_expect()
** Type: int
** Purpose: Read a sequence of expected characters after whitespace.
** The source pointer is advanced until the expected
** string has been read or to the first character which
** is not expected.
** Arguments:
** sp the pointer to the source string
** expect the expected string
** verbose the indicator whether an error message should be produced
** Returns: |true| iff the expected string is found
**___________________________________________________ */
bool sp_expect(sp, expect, verbose) /* */
register String *sp; /* */
register String expect; /* */
bool verbose; /* */
{ /* */
while (is_space(**sp)) (*sp)++; /* */
/* */
for ( ; *expect; expect++) /* */
{ if (*expect != **sp) /* */
{ if (verbose) /* */
{ Error(1, *sp, expect, expected); } /* */
return false; /* */
} /* */
(*sp)++; /* */
} /* */
return true; /* */
} /*------------------------*/
#define SkipSpaces(PTR) while( is_space(*PTR) ) (PTR)++
/*-----------------------------------------------------------------------------
** Function: sp_symbols()
** Type: String*
** Purpose:
**
** Arguments:
** sp the pointer to the value to be parsed
** Returns: an array of Symbols
**___________________________________________________ */
Symbol* sp_symbols(sp) /* */
String *sp; /* */
{ Symbol s; /* */
Symbol *a = NULL; /* */
int n = 0; /* */
int i = 0; /* */
/* */
if (sp_expect(sp, (String)"{", false)) /* */
{ n = 4; /* */
a = (Symbol*)malloc(n * sizeof(Symbol)); /* */
if (a == (Symbol*)NULL) /* */
{ OUT_OF_MEMORY("symbols"); } /* */
/* */
SkipSpaces(*sp); /* */
while (**sp && **sp != '}') /* */
{ SkipSpaces(*sp); /* */
if ((s = SParseSymbol(sp)) == NO_SYMBOL) { /* */
return (Symbol*)NULL; /* */
} /* */
if (i >= n - 1) /* */
{ n += 4; /* */
a = (Symbol*)realloc(a, n * sizeof(Symbol));/* */
if (a == NULL) { OUT_OF_MEMORY("symbols"); }/* */
} /* */
a[i++] = s; /* */
SkipSpaces(*sp); /* */
} /* */
if (**sp == '\0') /* */
{ Error(true, *sp, unexpected, /* */
"end of symbols."); /* */
return (Symbol*)NULL; /* */
} /* */
(*sp)++; /* */
a[i] = NO_SYMBOL; /* */
/* */
} else if ( !is_digit(**sp) && /* */
(s=s_parse(StringParseSymbol, /* */
sp, 0)) != NO_SYMBOL) { /* */
a = (Symbol*)malloc(2 * sizeof(Symbol)); /* */
if (a == NULL) { OUT_OF_MEMORY("symbols"); } /* */
a[0] = s; /* */
a[1] = NO_SYMBOL; /* */
} else { /* */
Error(true, *sp, "List of symbols", expected); /* */
} /* */
return a; /* */
} /*------------------------*/
|
