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91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lib/mlrutil.h"
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#include "containers/sllv.h"
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#include "containers/slls.h"
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#include "containers/lhmslv.h"
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#include "containers/mixutil.h"
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#include "mapping/mappers.h"
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typedef struct _mapper_group_like_state_t {
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// map from list of string to list of record
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lhmslv_t* precords_by_key_field_names;
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} mapper_group_like_state_t;
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static void mapper_group_like_usage(FILE* o, char* argv0, char* verb);
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static mapper_t* mapper_group_like_parse_cli(int* pargi, int argc, char** argv);
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static mapper_t* mapper_group_like_alloc();
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static void mapper_group_like_free(void* pvstate);
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static sllv_t* mapper_group_like_process(lrec_t* pinrec, context_t* pctx, void* pvstate);
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// ----------------------------------------------------------------
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mapper_setup_t mapper_group_like_setup = {
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.verb = "group-like",
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.pusage_func = mapper_group_like_usage,
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.pparse_func = mapper_group_like_parse_cli,
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};
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// ----------------------------------------------------------------
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static void mapper_group_like_usage(FILE* o, char* argv0, char* verb) {
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fprintf(o, "Usage: %s %s\n", argv0, verb);
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fprintf(o, "Outputs records in batches having identical field names.\n");
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}
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static mapper_t* mapper_group_like_parse_cli(int* pargi, int argc, char** argv) {
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if ((argc - *pargi) < 1) {
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mapper_group_like_usage(stderr, argv[0], argv[*pargi]);
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return NULL;
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}
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mapper_t* pmapper = mapper_group_like_alloc();
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*pargi += 1;
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return pmapper;
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}
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// ----------------------------------------------------------------
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static mapper_t* mapper_group_like_alloc() {
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mapper_t* pmapper = mlr_malloc_or_die(sizeof(mapper_t));
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mapper_group_like_state_t* pstate = mlr_malloc_or_die(sizeof(mapper_group_like_state_t));
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pstate->precords_by_key_field_names = lhmslv_alloc();
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pmapper->pvstate = pstate;
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pmapper->pprocess_func = mapper_group_like_process;
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pmapper->pfree_func = mapper_group_like_free;
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return pmapper;
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}
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static void mapper_group_like_free(void* pvstate) {
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mapper_group_like_state_t* pstate = (mapper_group_like_state_t*)pvstate;
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// xxx check for full recursive free
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lhmslv_free(pstate->precords_by_key_field_names);
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}
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// ----------------------------------------------------------------
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static sllv_t* mapper_group_like_process(lrec_t* pinrec, context_t* pctx, void* pvstate) {
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mapper_group_like_state_t* pstate = pvstate;
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if (pinrec != NULL) {
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slls_t* pkey_field_names = mlr_reference_keys_from_record(pinrec);
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sllv_t* plist = lhmslv_get(pstate->precords_by_key_field_names, pkey_field_names);
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if (plist == NULL) {
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plist = sllv_alloc();
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sllv_add(plist, pinrec);
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lhmslv_put(pstate->precords_by_key_field_names, slls_copy(pkey_field_names), plist);
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} else {
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sllv_add(plist, pinrec);
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}
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return NULL;
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}
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else {
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sllv_t* poutput = sllv_alloc();
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for (lhmslve_t* pe = pstate->precords_by_key_field_names->phead; pe != NULL; pe = pe->pnext) {
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sllv_t* plist = pe->pvvalue;
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for (sllve_t* pf = plist->phead; pf != NULL; pf = pf->pnext) {
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sllv_add(poutput, pf->pvdata);
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}
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}
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sllv_add(poutput, NULL);
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return poutput;
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}
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}
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