jsonnet-sys 0.17.0

Native bindings to the libjsonnet library
Documentation 
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/*
Copyright 2015 Google Inc. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

#include <libjsonnet.h>

typedef struct JsonnetJsonValue JJV;

static JJV *native_concat(void *ctx, const JJV * const *argv, int *succ)
{
    struct JsonnetVm *vm = (struct JsonnetVm *)ctx;
    const char *a = jsonnet_json_extract_string(vm, argv[0]);
    const char *b = jsonnet_json_extract_string(vm, argv[1]);
    if (a == NULL || b == NULL) {
        *succ = 0;
        return jsonnet_json_make_string(vm, "Bad params.");
    }
    char *str = malloc(strlen(a) + strlen(b) + 1);
    sprintf(str, "%s%s", a, b);
    JJV *r = jsonnet_json_make_string(vm, str);
    free(str);
    *succ = 1;
    return r;
}

static JJV *native_square(void *ctx, const JJV * const *argv, int *succ)
{
    struct JsonnetVm *vm = (struct JsonnetVm *)ctx;
    double a;
    if (!jsonnet_json_extract_number(vm, argv[0], &a)) {
        *succ = 0;
        return jsonnet_json_make_string(vm, "Bad param 'a'.");
    }
    *succ = 1;
    return jsonnet_json_make_number(vm, a * a);
}

static JJV *native_build(void *ctx, const JJV * const *argv, int *succ)
{
    struct JsonnetVm *vm = (struct JsonnetVm *)ctx;
    (void) argv;
    JJV *obj_top = jsonnet_json_make_object(vm);
    JJV *arr_top = jsonnet_json_make_array(vm);
    JJV *arr1 = jsonnet_json_make_array(vm);
    jsonnet_json_array_append(vm, arr1, jsonnet_json_make_string(vm, "Test 1.1"));
    jsonnet_json_array_append(vm, arr1, jsonnet_json_make_string(vm, "Test 1.2"));
    jsonnet_json_array_append(vm, arr1, jsonnet_json_make_string(vm, "Test 1.3"));
    jsonnet_json_array_append(vm, arr1, jsonnet_json_make_bool(vm, 1));
    jsonnet_json_array_append(vm, arr1, jsonnet_json_make_number(vm, 42));
    jsonnet_json_array_append(vm, arr1, jsonnet_json_make_null(vm));
    jsonnet_json_array_append(vm, arr1, jsonnet_json_make_object(vm));
    jsonnet_json_array_append(vm, arr_top, arr1);
    JJV *arr2 = jsonnet_json_make_array(vm);
    jsonnet_json_array_append(vm, arr2, jsonnet_json_make_string(vm, "Test 2.1"));
    jsonnet_json_array_append(vm, arr2, jsonnet_json_make_string(vm, "Test 2.2"));
    jsonnet_json_array_append(vm, arr2, jsonnet_json_make_string(vm, "Test 2.3"));
    jsonnet_json_array_append(vm, arr2, jsonnet_json_make_bool(vm, 0));
    jsonnet_json_array_append(vm, arr2, jsonnet_json_make_number(vm, -42));
    jsonnet_json_array_append(vm, arr2, jsonnet_json_make_null(vm));
    JJV *little_obj = jsonnet_json_make_object(vm);
    jsonnet_json_object_append(vm, little_obj, "f", jsonnet_json_make_string(vm, "foo"));
    jsonnet_json_object_append(vm, little_obj, "g", jsonnet_json_make_string(vm, "bar"));
    jsonnet_json_array_append(vm, arr2, little_obj);
    jsonnet_json_array_append(vm, arr_top, arr2);
    jsonnet_json_object_append(vm, obj_top, "field", arr_top);
    *succ = 1;
    return obj_top;
}

int main(int argc, const char **argv)
{
    int error;
    char *output;
    struct JsonnetVm *vm;
    const char *params0[] = {NULL};
    const char *params1[] = {"a", NULL};
    const char *params2[] = {"a", "b", NULL};
    if (argc != 2) {
        fprintf(stderr, "libjsonnet_test_snippet <string>\n");
        return EXIT_FAILURE;
    }
    vm = jsonnet_make();
    jsonnet_native_callback(vm, "concat", native_concat, vm, params2);
    jsonnet_native_callback(vm, "square", native_square, vm, params1);
    jsonnet_native_callback(vm, "build", native_build, vm, params0);
    output = jsonnet_evaluate_snippet(vm, "snippet", argv[1], &error);
    if (error) {
        fprintf(stderr, "%s", output);
        jsonnet_realloc(vm, output, 0);
        jsonnet_destroy(vm);
        return EXIT_FAILURE;
    } 
    printf("%s", output);
    jsonnet_realloc(vm, output, 0);
    jsonnet_destroy(vm);
    return EXIT_SUCCESS;
}