152 lines
4.4 KiB
C
152 lines
4.4 KiB
C
/**
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* @file implode.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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* Synopsis:
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* implode(string glue, list(string) pieces)
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*
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* Variables:
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* string (empty) - concatenation of strings in 'pieces', with 'glue' in between
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* every two elements.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <misc/expstring.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_implode.h>
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struct instance {
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NCDModuleInst *i;
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MemRef 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 glue_arg;
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NCDValRef pieces_arg;
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if (!NCDVal_ListRead(params->args, 2, &glue_arg, &pieces_arg)) {
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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_IsString(glue_arg) || !NCDVal_IsList(pieces_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// init result string
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ExpString str;
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if (!ExpString_Init(&str)) {
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ModuleLog(i, BLOG_ERROR, "ExpString_Init failed");
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goto fail0;
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}
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size_t count = NCDVal_ListCount(pieces_arg);
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for (size_t j = 0; j < count; j++) {
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NCDValRef piece = NCDVal_ListGet(pieces_arg, j);
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// check piece type
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if (!NCDVal_IsString(piece)) {
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ModuleLog(i, BLOG_ERROR, "wrong piece type");
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goto fail1;
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}
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// append glue
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if (j > 0) {
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if (!ExpString_AppendBinaryMr(&str, NCDVal_StringMemRef(glue_arg))) {
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ModuleLog(i, BLOG_ERROR, "ExpString_AppendBinaryMr failed");
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goto fail1;
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}
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}
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// append piece
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if (!ExpString_AppendBinaryMr(&str, NCDVal_StringMemRef(piece))) {
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ModuleLog(i, BLOG_ERROR, "ExpString_AppendBinaryMr failed");
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goto fail1;
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}
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}
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// store result
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o->result = ExpString_GetMr(&str);
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// signal up
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NCDModuleInst_Backend_Up(i);
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return;
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fail1:
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ExpString_Free(&str);
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void func_die (void *vo)
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{
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struct instance *o = vo;
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// free result
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free((char *)o->result.ptr);
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NCDModuleInst_Backend_Dead(o->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_NewStringBinMr(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 = "implode",
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.func_new2 = func_new,
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.func_die = func_die,
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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_implode = {
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.modules = modules
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};
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