add jshn (JSON SHell Notation), a small utility and shell library for parsing and generating json data

SVN-Revision: 25547
This commit is contained in:
Felix Fietkau 2011-02-16 00:24:52 +00:00
parent f1ac8cf285
commit 9d4d2587d7
4 changed files with 405 additions and 0 deletions

32
package/jshn/Makefile Normal file
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include $(TOPDIR)/rules.mk
PKG_NAME:=jshn
PKG_VERSION:=0.1
PKG_RELEASE=1
include $(INCLUDE_DIR)/package.mk
define Package/jshn
SECTION:=utils
CATEGORY:=Utilities
DEPENDS:=+libjson
TITLE:=JSON SHell Notation
endef
define Package/jshn/description
Library for parsing and generating JSON from shell scripts
endef
TARGET_CFLAGS += -I$(STAGING_DIR)/usr/include --std=gnu99
define Build/Compile
$(TARGET_CC) $(TARGET_CFLAGS) -o $(PKG_BUILD_DIR)/jshn src/jshn.c $(TARGET_LDFLAGS) -ljson
endef
define Package/jshn/install
$(INSTALL_DIR) $(1)/bin $(1)/lib/functions
$(INSTALL_BIN) $(PKG_BUILD_DIR)/jshn $(1)/bin
$(INSTALL_DATA) ./files/jshn.sh $(1)/lib/functions
endef
$(eval $(call BuildPackage,jshn))

19
package/jshn/example.txt Normal file
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. /lib/functions/jshn.sh
# generating json data
json_init
json_add_string "msg" "Hello, world!"
json_add_object "test"
json_add_int "testdata" "1"
json_close_object
MSG=`json_dump`
# MSG now contains: { "msg": "Hello, world!", "test": { "testdata": 1 } }
# parsing json data
json_load "$MSG"
json_select test
json_get_var var1 testdata
json_select ..
json_get_var var2 msg
echo "msg: $var2 - testdata: $var1"

109
package/jshn/files/jshn.sh Normal file
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[ -z "$N" ] && . /etc/functions.sh
# functions for parsing and generating json
json_init() {
[ -n "$JSON_UNSET" ] && eval "unset $JSON_UNSET"
export -- JSON_SEQ=0 JSON_STACK= JSON_CUR="JSON_VAR" JSON_UNSET=
}
json_add_generic() {
local type="$1"
local var="$2"
local val="$3"
local cur="${4:-$JSON_CUR}"
export ${NO_EXPORT:+-n} -- "${cur}_$var=$val"
export ${NO_EXPORT:+-n} -- "TYPE_${cur}_$var=$type"
append JSON_UNSET "${cur}_$var TYPE_${cur}_$var"
append "KEYS_${cur}" "$var"
}
json_add_table() {
JSON_SEQ=$(($JSON_SEQ + 1))
append JSON_STACK "$JSON_CUR"
local table="JSON_TABLE$JSON_SEQ"
export ${NO_EXPORT:+-n} -- "UP_$table=$JSON_CUR"
JSON_CUR="$table"
}
json_add_object() {
local cur="$JSON_CUR"
json_add_table
json_add_generic object "$1" "$JSON_CUR" "$cur"
}
json_close_object() {
local oldstack="$JSON_STACK"
export "KEYS_${JSON_CUR}"
JSON_CUR="${JSON_STACK##* }"
JSON_STACK="${JSON_STACK% *}"
[[ "$oldstack" == "$JSON_STACK" ]] && JSON_STACK=
}
json_add_array() {
local cur="$JSON_CUR"
json_add_table
json_add_generic array "$1" "$JSON_CUR" "$cur"
}
json_close_array() {
json_close_object
}
json_add_string() {
json_add_generic string "$1" "$2"
}
json_add_int() {
json_add_generic int "$1" "$2"
}
json_add_boolean() {
json_add_generic boolean "$1" "$2"
}
# functions read access to json variables
json_load() {
eval `jshn -r "$1"`
}
json_dump() {
jshn -w
}
json_get_type() {
local dest="$1"
local var="$2"
eval "export ${NO_EXPORT:+-n} -- \"$dest=\${TYPE_${JSON_CUR}_$var}\""
}
json_get_var() {
local dest="$1"
local var="$2"
eval "export ${NO_EXPORT:+-n} -- \"$dest=\${${JSON_CUR}_$var}\""
}
json_select() {
local target="$1"
local type
[ -z "$1" ] && {
JSON_CUR="JSON_VAR"
return
}
[[ "$1" == ".." ]] && {
eval "JSON_CUR=\"\${UP_$JSON_CUR}\""
return;
}
json_get_type type "$target"
case "$type" in
object|array)
json_get_var JSON_CUR "$target"
;;
*)
echo "WARNING: Variable '$target' does not exist or is not an array/object"
;;
esac
}

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package/jshn/src/jshn.c Normal file
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#include <json/json.h>
#include <libubox/list.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <ctype.h>
#include <getopt.h>
#define MAX_VARLEN 256
static int add_json_element(const char *key, json_object *obj);
static int add_json_object(json_object *obj)
{
int ret = 0;
json_object_object_foreach(obj, key, val) {
ret = add_json_element(key, val);
if (ret)
break;
}
return ret;
}
static int add_json_array(struct array_list *a)
{
char seq[12];
int i, len;
int ret;
for (i = 0, len = array_list_length(a); i < len; i++) {
sprintf(seq, "%d", i);
ret = add_json_element(seq, array_list_get_idx(a, i));
if (ret)
return ret;
}
return 0;
}
static void add_json_string(const char *str)
{
char *ptr = (char *) str;
int len;
char *c;
while ((c = strchr(ptr, '\'')) != NULL) {
len = c - ptr;
if (len > 0)
fwrite(ptr, len, 1, stdout);
ptr = c + 1;
c = "'\\''";
fwrite(c, strlen(c), 1, stdout);
}
len = strlen(ptr);
if (len > 0)
fwrite(ptr, len, 1, stdout);
}
static void write_key_string(const char *key)
{
while (*key) {
putc(isalnum(*key) ? *key : '_', stdout);
key++;
}
}
static int add_json_element(const char *key, json_object *obj)
{
char *type;
if (!obj)
return -1;
switch (json_object_get_type(obj)) {
case json_type_object:
type = "object";
break;
case json_type_array:
type = "array";
break;
case json_type_string:
type = "string";
break;
case json_type_boolean:
type = "boolean";
break;
case json_type_int:
type = "int";
break;
default:
return -1;
}
fprintf(stdout, "json_add_%s '", type);
write_key_string(key);
switch (json_object_get_type(obj)) {
case json_type_object:
fprintf(stdout, "';\n");
add_json_object(obj);
fprintf(stdout, "json_close_object;\n");
break;
case json_type_array:
fprintf(stdout, "';\n");
add_json_array(json_object_get_array(obj));
fprintf(stdout, "json_close_array;\n");
break;
case json_type_string:
fprintf(stdout, "' '");
add_json_string(json_object_get_string(obj));
fprintf(stdout, "';\n");
break;
case json_type_boolean:
fprintf(stdout, "' %d;\n", json_object_get_boolean(obj));
break;
case json_type_int:
fprintf(stdout, "' %d;\n", json_object_get_int(obj));
break;
default:
return -1;
}
return 0;
}
static int jshn_parse(const char *str)
{
json_object *obj;
obj = json_tokener_parse(str);
if (is_error(obj) || json_object_get_type(obj) != json_type_object) {
fprintf(stderr, "Failed to parse message data\n");
return 1;
}
fprintf(stdout, "json_init;\n");
add_json_object(obj);
fflush(stdout);
return 0;
}
static char *get_keys(const char *prefix)
{
char *keys;
keys = alloca(strlen(prefix) + sizeof("KEYS_") + 1);
sprintf(keys, "KEYS_%s", prefix);
return getenv(keys);
}
static void get_var(const char *prefix, const char *name, char **var, char **type)
{
char *tmpname;
tmpname = alloca(strlen(prefix) + 1 + strlen(name) + 1 + sizeof("TYPE_"));
sprintf(tmpname, "TYPE_%s_%s", prefix, name);
*var = getenv(tmpname + 5);
*type = getenv(tmpname);
}
static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array);
static void jshn_add_object_var(json_object *obj, bool array, const char *prefix, const char *name)
{
json_object *new;
char *var, *type;
get_var(prefix, name, &var, &type);
if (!var || !type)
return;
if (!strcmp(type, "array")) {
new = json_object_new_array();
jshn_add_objects(new, var, true);
} else if (!strcmp(type, "object")) {
new = json_object_new_object();
jshn_add_objects(new, var, false);
} else if (!strcmp(type, "string")) {
new = json_object_new_string(var);
} else if (!strcmp(type, "int")) {
new = json_object_new_int(atoi(var));
} else if (!strcmp(type, "boolean")) {
new = json_object_new_boolean(!!atoi(var));
} else {
return;
}
if (array)
json_object_array_add(obj, new);
else
json_object_object_add(obj, name, new);
}
static json_object *jshn_add_objects(json_object *obj, const char *prefix, bool array)
{
char *keys, *key, *brk;
keys = get_keys(prefix);
if (!keys || !obj)
goto out;
for (key = strtok_r(keys, " ", &brk); key;
key = strtok_r(NULL, " ", &brk)) {
jshn_add_object_var(obj, array, prefix, key);
}
out:
return obj;
}
static int jshn_format(void)
{
json_object *obj;
obj = json_object_new_object();
jshn_add_objects(obj, "JSON_VAR", false);
fprintf(stdout, "%s\n", json_object_to_json_string(obj));
json_object_put(obj);
return 0;
}
static int usage(const char *progname)
{
fprintf(stderr, "Usage: %s -r <message>|-w\n", progname);
return 2;
}
int main(int argc, char **argv)
{
int ch;
while ((ch = getopt(argc, argv, "r:w")) != -1) {
switch(ch) {
case 'r':
return jshn_parse(optarg);
case 'w':
return jshn_format();
default:
return usage(argv[0]);
}
}
return usage(argv[0]);
}