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/* ------------------------------------------------------------------------
@NAME : traversal.c
@DESCRIPTION: Routines for traversing the AST for a single entry.
@GLOBALS :
@CALLS :
@CREATED : 1997/01/21, Greg Ward
@MODIFIED :
@VERSION : $Id: traversal.c,v 1.17 1999/11/29 01:13:10 greg Rel $
@COPYRIGHT : Copyright (c) 1996-99 by Gregory P. Ward. All rights reserved.
This file is part of the btparse library. This library 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.
-------------------------------------------------------------------------- */
/*#include "bt_config.h"*/
#include <stdlib.h>
#include "btparse.h"
#include "parse_auxiliary.h"
#include "prototypes.h"
/*#include "my_dmalloc.h"*/
AST *bt_next_entry (AST *entry_list, AST *prev_entry)
{
if (entry_list == NULL || entry_list->nodetype != BTAST_ENTRY)
return NULL;
if (prev_entry)
{
if (prev_entry->nodetype != BTAST_ENTRY)
return NULL;
else
return prev_entry->right;
}
else
return entry_list;
}
bt_metatype bt_entry_metatype (AST *entry)
{
if (!entry) return BTE_UNKNOWN;
if (entry->nodetype != BTAST_ENTRY)
return BTE_UNKNOWN;
else
return entry->metatype;
}
char *bt_entry_type (AST *entry)
{
if (!entry) return NULL;
if (entry->nodetype != BTAST_ENTRY)
return NULL;
else
return entry->text;
}
char *bt_entry_key (AST *entry)
{
if (entry->metatype == BTE_REGULAR &&
entry->down && entry->down->nodetype == BTAST_KEY)
{
return entry->down->text;
}
else
{
return NULL;
}
}
AST *bt_next_field (AST *entry, AST *prev, char **name)
{
AST *field;
bt_metatype metatype;
*name = NULL;
if (!entry || !entry->down) return NULL; /* protect against empty entry */
metatype = entry->metatype;
if (metatype != BTE_MACRODEF && metatype != BTE_REGULAR)
return NULL;
if (prev == NULL) /* no previous field -- they must */
{ /* want the first one */
field = entry->down;
if (metatype == BTE_REGULAR && field->nodetype == BTAST_KEY)
field = field->right; /* skip over citation key if present */
}
else /* they really do want the next one */
{
field = prev->right;
}
if (!field) return NULL; /* protect against field-less entry */
if (name) *name = field->text;
return field;
} /* bt_next_field() */
AST *bt_next_macro (AST *entry, AST *prev, char **name)
{
return bt_next_field (entry, prev, name);
}
AST *bt_next_value (AST *top, AST *prev, bt_nodetype *nodetype, char **text)
{
bt_nodetype nt; /* type of `top' node (to check) */
bt_metatype mt;
AST * value;
if (nodetype) *nodetype = BTAST_BOGUS;
if (text) *text = NULL;
if (!top) return NULL;
/* get_node_type (top, &nt, &mt); */
nt = top->nodetype;
mt = top->metatype;
if ((nt == BTAST_FIELD) ||
(nt == BTAST_ENTRY && (mt == BTE_COMMENT || mt == BTE_PREAMBLE)))
{
if (prev == NULL) /* no previous value -- give 'em */
{ /* the first one */
value = top->down;
if (!value) return NULL;
if (nodetype) *nodetype = value->nodetype;
}
else
{
value = prev->right;
if (!value) return NULL;
if (nodetype) *nodetype = value->nodetype;
}
if (nt == BTAST_ENTRY && value->nodetype != BTAST_STRING)
internal_error ("found comment or preamble with non-string value");
}
else
{
value = NULL;
}
if (text && value) *text = value->text;
return value;
} /* bt_next_value() */
char *bt_get_text (AST *node)
{
ushort pp_options = BTO_FULL; /* options for full processing: */
/* expand macros, paste strings, */
/* collapse whitespace */
bt_nodetype nt;
bt_metatype mt;
nt = node->nodetype;
mt = node->metatype;
if (nt == BTAST_FIELD)
{
#if DEBUG
char *value;
dump_ast ("bt_get_text (pre): node =\n", node);
value = bt_postprocess_field (node, pp_options, FALSE);
dump_ast ("bt_get_text (post): node =\n", node);
return value;
#else
return bt_postprocess_field (node, pp_options, FALSE);
#endif
}
else if (nt == BTAST_ENTRY && (mt == BTE_COMMENT || mt == BTE_PREAMBLE))
{
return bt_postprocess_value (node->down, pp_options, FALSE);
}
else
{
return NULL;
}
}
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