143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/**
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* @file choose.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Multiple value selection based on boolean conditions.
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*
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* Synopsis:
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* choose({{string cond1, result1}, ..., {string condN, resultN}}, default_result)
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*
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* Variables:
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* (empty) - If cond1="true" then result1,
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* else if cond2="true" then result2,
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* ...,
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* else default_result.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_choose.h>
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struct instance {
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NCDModuleInst *i;
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NCDValRef result;
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};
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static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct instance *o = vo;
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o->i = i;
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// read arguments
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NCDValRef arg_choices;
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NCDValRef arg_default_result;
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if (!NCDVal_ListRead(params->args, 2, &arg_choices, &arg_default_result)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsList(arg_choices)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// iterate choices
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int have_result = 0;
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size_t count = NCDVal_ListCount(arg_choices);
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for (size_t j = 0; j < count; j++) {
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NCDValRef c = NCDVal_ListGet(arg_choices, j);
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// check choice type
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if (!NCDVal_IsList(c)) {
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ModuleLog(i, BLOG_ERROR, "wrong choice type");
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goto fail0;
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}
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// read choice
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NCDValRef c_cond;
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NCDValRef c_result;
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if (!NCDVal_ListRead(c, 2, &c_cond, &c_result)) {
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ModuleLog(i, BLOG_ERROR, "wrong choice contents arity");
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goto fail0;
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}
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int c_cond_val;
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if (!ncd_read_boolean(c_cond, &c_cond_val)) {
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ModuleLog(i, BLOG_ERROR, "wrong choice condition");
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goto fail0;
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}
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// update result
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if (!have_result && c_cond_val) {
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o->result = c_result;
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have_result = 1;
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}
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}
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// default?
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if (!have_result) {
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o->result = arg_default_result;
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}
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static int func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
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{
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struct instance *o = vo;
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if (name == NCD_STRING_EMPTY) {
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*out = NCDVal_NewCopy(mem, o->result);
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return 1;
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}
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return 0;
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}
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static struct NCDModule modules[] = {
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{
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.type = "choose",
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.func_new2 = func_new,
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.func_getvar2 = func_getvar2,
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.alloc_size = sizeof(struct instance)
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}, {
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.type = NULL
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}
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};
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const struct NCDModuleGroup ncdmodule_choose = {
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.modules = modules
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};
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