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/*
*
* Copyright (c) 2022, Masatake YAMATO
* Copyright (c) 2022, Red Hat, K.K.
*
* This source code is released for free distribution under the terms of the
* GNU General Public License version 2 or (at your option) any later version.
*
* This module contains functions for extracting language objects in FrontMatter
* using Yaml.
*
* https://gohugo.io/content-management/front-matter
*/
/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */
#include "frontmatter.h"
#include "yaml.h"
#include "entry.h"
#include "gcc-attr.h"
#include "parse.h"
#include "read.h"
#include "subparser.h"
#include "trace.h"
/*
* DATA DECLARATIONS
*/
enum yamlfrontmatterDetectingState {
DSTAT_LAST_KEY,
DSTAT_LAST_VALUE,
DSTAT_INITIAL,
};
struct sYamlFrontMatterSubparser {
yamlSubparser yaml;
enum yamlfrontmatterDetectingState detection_state;
};
/*
* FUNCTION PROTOTYPES
*/
static bool yamlFrontmattterInitTagEntry (tagEntryInfo *e, char *name, void *data);
/*
* DATA DEFINITIONS
*/
static langType frontMatterLang;
static tagYpathTable ypathTables [] = {
{
"title",
DSTAT_LAST_VALUE,
.initTagEntry = yamlFrontmattterInitTagEntry,
},
};
/*
* FUNCTION DEFINITIONS
*/
static void yamlfrontmatterStateMachine (struct sYamlFrontMatterSubparser *yamlfrontmatter,
yaml_token_t *token)
{
#ifdef DO_TRACING
ypathPrintTypeStack (YAML(yamlfrontmatter));
#endif
switch (token->type)
{
case YAML_KEY_TOKEN:
yamlfrontmatter->detection_state = DSTAT_LAST_KEY;
break;
case YAML_SCALAR_TOKEN:
switch (yamlfrontmatter->detection_state)
{
case DSTAT_LAST_KEY:
ypathFillKeywordOfTokenMaybe (YAML(yamlfrontmatter), token, getInputLanguage ());
/* FALL THROUGH */
case DSTAT_LAST_VALUE:
TRACE_PRINT("token-callback: %s: %s",
(yamlfrontmatter->detection_state == DSTAT_LAST_KEY)? "key": "value",
(char*)token->data.scalar.value);
ypathHandleToken (YAML(yamlfrontmatter), token, yamlfrontmatter->detection_state,
ypathTables, ARRAY_SIZE (ypathTables));
break;
default:
break;
}
yamlfrontmatter->detection_state = DSTAT_INITIAL;
break;
case YAML_VALUE_TOKEN:
yamlfrontmatter->detection_state = DSTAT_LAST_VALUE;
break;
default:
yamlfrontmatter->detection_state = DSTAT_INITIAL;
break;
}
}
static void newTokenCallback (yamlSubparser *s, yaml_token_t *token)
{
if (token->type == YAML_BLOCK_SEQUENCE_START_TOKEN
|| token->type == YAML_BLOCK_MAPPING_START_TOKEN)
ypathPushType (s, token);
yamlfrontmatterStateMachine ((struct sYamlFrontMatterSubparser *)s, token);
if (token->type == YAML_BLOCK_END_TOKEN)
ypathPopType (s);
else if (token->type == YAML_STREAM_END_TOKEN)
ypathPopAllTypes (s);
}
static bool yamlFrontmattterInitTagEntry (tagEntryInfo *e, char *name, void * data CTAGS_ATTR_UNUSED)
{
initForeignTagEntry (e, name, frontMatterLang, FRONTMATTER_TITLE_KIND);
return true;
}
static void yamlFrontMatterInputStart(subparser *s)
{
((struct sYamlFrontMatterSubparser*)s)->detection_state = DSTAT_INITIAL;
((yamlSubparser*)s)->ypathTypeStack = NULL;
}
static void yamlFrontMatterInputEnd(subparser *s)
{
Assert (((yamlSubparser*)s)->ypathTypeStack == NULL);
}
static void findYamlFrontMatterTags (void)
{
scheduleRunningBaseparser (0);
}
static void yamlFrontMatterInitialize (langType language)
{
ypathCompileTables (language, ypathTables, ARRAY_SIZE (ypathTables), 0);
frontMatterLang = getNamedLanguage ("FrontMatter", 0);
}
static void yamlFrontMatterFinalize (langType language, bool initialized)
{
if (initialized)
ypathCompiledCodeDelete (ypathTables, ARRAY_SIZE (ypathTables));
}
extern parserDefinition* YamlFrontMatter (void)
{
static struct sYamlFrontMatterSubparser yamlfrontmatterSubparser = {
.yaml = {
.subparser = {
.direction = SUBPARSER_SUB_RUNS_BASE,
.inputStart = yamlFrontMatterInputStart,
.inputEnd = yamlFrontMatterInputEnd,
},
.newTokenNotfify = newTokenCallback
},
};
static parserDependency dependencies [] = {
{ DEPTYPE_SUBPARSER, "Yaml", &yamlfrontmatterSubparser },
{ DEPTYPE_FOREIGNER, "FrontMatter", NULL },
};
parserDefinition* const def = parserNew ("YamlFrontMatter");
def->dependencies = dependencies;
def->dependencyCount = ARRAY_SIZE (dependencies);
def->kindTable = NULL;
def->kindCount = 0;
def->parser = findYamlFrontMatterTags;
def->initialize = yamlFrontMatterInitialize;
def->finalize = yamlFrontMatterFinalize;
/* This parser runs ONLY as a part of FrontMatter parser.
* User may not want to enable/disable this parser directly. */
def->invisible = true;
return def;
}
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