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/*
* Copyright (c) 2009, Eric Forgeot
* Copyright (c) 2014, Colomban Wendling <colomban@geany.org>
*
* Based on work by Jon Strait
*
* This source code is released for free distribution under the terms of the
* GNU General Public License version 2 or (at your opinion) any later version.
*
* This module contains functions for generating tags for Txt2tags files
* (https://en.wikipedia.org/wiki/Txt2tags).
*/
/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */
#include <ctype.h>
#include <string.h>
#include "parse.h"
#include "read.h"
#include "nestlevel.h"
#include "vstring.h"
#include "routines.h"
#include "entry.h"
#define SCOPE_SEPARATOR "\"\""
/*
* DATA DEFINITIONS
*/
typedef enum {
K_SECTION = 0
} Txt2tagsKind;
static scopeSeparator Txt2TagsSeparators [] = {
{ KIND_WILDCARD_INDEX, SCOPE_SEPARATOR }
};
static kindDefinition Txt2tagsKinds[] = {
{ true, 's', "section", "sections",
ATTACH_SEPARATORS(Txt2TagsSeparators) },
};
struct nestingLevelUserData {
int indentation;
};
#define NL_INDENTATION(nl) ((struct nestingLevelUserData *)nestingLevelGetUserData(nl))->indentation
/*
* FUNCTION DEFINITIONS
*/
static int makeTxt2tagsTag (const vString* const name,
const NestingLevels *const nls,
Txt2tagsKind type)
{
tagEntryInfo e;
NestingLevel *nl;
initTagEntry (&e, vStringValue(name), type);
nl = nestingLevelsGetCurrent (nls);
if (nl)
e.extensionFields.scopeIndex = nl->corkIndex;
return makeTagEntry(&e);
}
/* matches: ^ *[=_-]{20,} *$ */
static bool isTxt2tagsLine (const unsigned char *line)
{
unsigned int len;
while (isspace(*line)) line++;
for (len = 0; *line == '=' || *line == '-' || *line == '_'; len++)
line++;
while (isspace(*line)) line++;
return len >= 20 && *line == 0;
}
static bool parseTxt2tagsTitle (const unsigned char *line,
vString *const title,
int *const depth_)
{
const int MAX_TITLE_DEPTH = 5; /* maximum length of a title delimiter */
unsigned char delim;
int delim_delta = 0;
const unsigned char *end;
/* skip leading spaces, but no tabs (probably because they create quotes) */
while (*line == ' ') line++;
/* normal/numbered titles */
if (*line != '=' && *line != '+')
return false;
delim = *line;
/* find the start delimiter length */
while (*line == delim && delim_delta < MAX_TITLE_DEPTH+1)
{
line++;
delim_delta++;
}
while (isspace(*line))
line++;
if (delim_delta > MAX_TITLE_DEPTH) /* invalid */
return false;
*depth_ = delim_delta;
/* find the end delimiter */
end = line + strlen((const char *) line) - 1;
while (end > line && isspace(*end)) end--;
/* skip a possible label: \[[A-Za-z0-9_-]+\] */
if (*end == ']')
{
end--;
while (end > line && (isalnum(*end) || *end == '_' || *end == '-'))
end--;
if (*end != '[') /* invalid */
return false;
end--;
}
while (end > line && *end == delim && delim_delta >= 0)
{
delim_delta--;
end--;
}
while (end > line && isspace(*end)) end--;
end++;
/* if start and end delimiters are not identical, or the the name is empty */
if (delim_delta != 0 || (end - line) <= 0)
return false;
vStringNCopyS(title, (const char *) line, end - line);
return true;
}
static void findTxt2tagsTags (void)
{
NestingLevels *nls = nestingLevelsNew(sizeof(struct nestingLevelUserData));
vString *name = vStringNew();
const unsigned char *line;
while ((line = readLineFromInputFile()) != NULL)
{
int depth;
if (isTxt2tagsLine(line))
; /* skip not to improperly match titles */
else if (parseTxt2tagsTitle(line, name, &depth))
{
NestingLevel *nl = nestingLevelsGetCurrent(nls);
int r;
while (nl && NL_INDENTATION(nl) >= depth)
{
nestingLevelsPop(nls);
nl = nestingLevelsGetCurrent(nls);
}
r = makeTxt2tagsTag(name, nls, K_SECTION);
nestingLevelsPush(nls, r);
nl = nestingLevelsGetCurrent(nls);
NL_INDENTATION(nl) = depth;
}
}
vStringDelete (name);
nestingLevelsFree(nls);
}
extern parserDefinition* Txt2tagsParser (void)
{
static const char *const patterns [] = { "*.t2t", NULL };
static const char *const extensions [] = { "t2t", NULL };
parserDefinition* const def = parserNew ("Txt2tags");
def->kindTable = Txt2tagsKinds;
def->kindCount = ARRAY_SIZE (Txt2tagsKinds);
def->patterns = patterns;
def->extensions = extensions;
def->parser = findTxt2tagsTags;
def->useCork = CORK_QUEUE;
return def;
}
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