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/*
* $Id: sml.c,v 1.6 2004/02/17 05:01:45 darren Exp $
*
* Copyright (c) 2002, Venkatesh Prasad Ranganath and Darren Hiebert
*
* This source code is released for free distribution under the terms of the
* GNU General Public License.
*
* This module contains functions for generating tags for SML language files.
*/
/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */
#include <string.h>
#include "entry.h"
#include "parse.h"
#include "read.h"
#include "vstring.h"
/*
* DATA DECLARATIONS
*/
typedef enum {
K_AND = -2,
K_NONE = -1,
K_EXCEPTION,
K_FUNCTION,
K_FUNCTOR,
K_SIGNATURE,
K_STRUCTURE,
K_TYPE,
K_VAL
} smlKind;
/*
* DATA DEFINITIONS
*/
static kindOption SmlKinds[] = {
{ TRUE, 'e', "exception", "exception declarations" },
{ TRUE, 'f', "function", "function definitions" },
{ TRUE, 'c', "functor", "functor definitions" },
{ TRUE, 's', "signature", "signature declarations" },
{ TRUE, 'r', "structure", "structure declarations" },
{ TRUE, 't', "type", "type definitions" },
{ TRUE, 'v', "value", "value bindings" }
};
static struct {
const char *keyword;
smlKind kind;
} SmlKeywordTypes [] = {
{ "abstype", K_TYPE },
{ "and", K_AND },
{ "datatype", K_TYPE },
{ "exception", K_EXCEPTION },
{ "functor", K_FUNCTOR },
{ "fun", K_FUNCTION },
{ "signature", K_SIGNATURE },
{ "structure", K_STRUCTURE },
{ "type", K_TYPE },
{ "val", K_VAL }
};
static unsigned int CommentLevel = 0;
/*
* FUNCTION DEFINITIONS
*/
static void makeSmlTag (smlKind type, vString *name)
{
tagEntryInfo tag;
initTagEntry (&tag, vStringValue (name));
tag.kindName = SmlKinds [type].name;
tag.kind = SmlKinds [type].letter;
makeTagEntry (&tag);
}
static const unsigned char *skipSpace (const unsigned char *cp)
{
while (isspace ((int) *cp))
++cp;
return cp;
}
static boolean isIdentifier (int c)
{
boolean result = FALSE;
/* Consider '_' as an delimiter to aid user in tracking it's usage. */
const char *const alternateIdentifiers = "!%&$#+-<>=/?@\\~'^|*_";
if (isalnum (c))
result = TRUE;
else if (c != '\0' && strchr (alternateIdentifiers, c) != NULL)
result = TRUE;
return result;
}
static const unsigned char *parseIdentifier (
const unsigned char *cp, vString *const identifier)
{
boolean stringLit = FALSE;
vStringClear (identifier);
while (*cp != '\0' && (!isIdentifier ((int) *cp) || stringLit))
{
int oneback = *cp;
cp++;
if (oneback == '(' && *cp == '*' && stringLit == FALSE)
{
CommentLevel++;
return ++cp;
}
if (*cp == '"' && oneback != '\\')
{
stringLit = TRUE;
continue;
}
if (stringLit && *cp == '"' && oneback != '\\')
stringLit = FALSE;
}
if (strcmp ((const char *) cp, "") == 0 || cp == NULL)
return cp;
while (isIdentifier ((int) *cp))
{
vStringPut (identifier, (int) *cp);
cp++;
}
vStringTerminate (identifier);
return cp;
}
static smlKind findNextIdentifier (const unsigned char **cp)
{
smlKind result = K_NONE;
vString *const identifier = vStringNew ();
unsigned int count = sizeof (SmlKeywordTypes) / sizeof (SmlKeywordTypes [0]);
unsigned int i;
*cp = parseIdentifier (*cp, identifier);
for (i = 0 ; i < count && result == K_NONE ; ++i)
{
const char *id = vStringValue (identifier);
if (strcmp (id, SmlKeywordTypes [i].keyword) == 0)
result = SmlKeywordTypes [i].kind;
}
return result;
}
static void findSmlTags (void)
{
vString *const identifier = vStringNew ();
const unsigned char *line;
smlKind lastTag = K_NONE;
while ((line = fileReadLine ()) != NULL)
{
const unsigned char *cp = skipSpace (line);
do
{
smlKind foundTag;
if (CommentLevel != 0)
{
cp = (const unsigned char *) strstr ((const char *) cp, "*)");
if (cp == NULL)
continue;
else
{
--CommentLevel;
cp += 2;
}
}
foundTag = findNextIdentifier (&cp);
if (foundTag != K_NONE)
{
cp = skipSpace (cp);
cp = parseIdentifier (cp, identifier);
if (foundTag == K_AND)
makeSmlTag (lastTag, identifier);
else
{
makeSmlTag (foundTag, identifier);
lastTag = foundTag;
}
}
if (strstr ((const char *) cp, "(*") != NULL)
{
cp += 2;
cp = (const unsigned char *) strstr ((const char *) cp, "*)");
if (cp == NULL)
++CommentLevel;
}
} while (cp != NULL && strcmp ((const char *) cp, "") != 0);
}
vStringDelete (identifier);
}
extern parserDefinition *SmlParser (void)
{
static const char *const extensions[] = { "sml", "sig", NULL };
parserDefinition *def = parserNew ("SML");
def->kinds = SmlKinds;
def->kindCount = KIND_COUNT (SmlKinds);
def->extensions = extensions;
def->parser = findSmlTags;
return def;
}
/* vi:set tabstop=8 shiftwidth=4: */
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