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111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
#include "lib/mlrutil.h"
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#include "containers/lrec.h"
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#include "containers/sllv.h"
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#include "containers/hss.h"
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#include "mapping/mappers.h"
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#include "cli/argparse.h"
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typedef struct _mapper_reorder_state_t {
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ap_state_t* pargp;
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slls_t* pfield_name_list;
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int put_at_end;
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} mapper_reorder_state_t;
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static void mapper_reorder_usage(FILE* o, char* argv0, char* verb);
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static mapper_t* mapper_reorder_parse_cli(int* pargi, int argc, char** argv,
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cli_reader_opts_t* _, cli_writer_opts_t* __);
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static mapper_t* mapper_reorder_alloc(ap_state_t* pargp, slls_t* pfield_name_list, int put_at_end);
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static void mapper_reorder_free(mapper_t* pmapper);
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static sllv_t* mapper_reorder_process(lrec_t* pinrec, context_t* pctx, void* pvstate);
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// ----------------------------------------------------------------
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mapper_setup_t mapper_reorder_setup = {
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.verb = "reorder",
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.pusage_func = mapper_reorder_usage,
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.pparse_func = mapper_reorder_parse_cli,
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.ignores_input = FALSE,
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};
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// ----------------------------------------------------------------
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static void mapper_reorder_usage(FILE* o, char* argv0, char* verb) {
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fprintf(o, "Usage: %s %s [options]\n", argv0, verb);
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fprintf(o, "-f {a,b,c} Field names to reorder.\n");
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fprintf(o, "-e Put specified field names at record end: default is to put\n");
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fprintf(o, " them at record start.\n");
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fprintf(o, "Examples:\n");
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fprintf(o, "%s %s -f a,b sends input record \"d=4,b=2,a=1,c=3\" to \"a=1,b=2,d=4,c=3\".\n",
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argv0, verb);
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fprintf(o, "%s %s -e -f a,b sends input record \"d=4,b=2,a=1,c=3\" to \"d=4,c=3,a=1,b=2\".\n",
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argv0, verb);
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}
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// ----------------------------------------------------------------
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static mapper_t* mapper_reorder_parse_cli(int* pargi, int argc, char** argv,
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cli_reader_opts_t* _, cli_writer_opts_t* __)
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{
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slls_t* pfield_name_list = NULL;
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int put_at_end = FALSE;
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char* verb = argv[(*pargi)++];
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ap_state_t* pstate = ap_alloc();
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ap_define_string_list_flag(pstate, "-f", &pfield_name_list);
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ap_define_true_flag(pstate, "-e", &put_at_end);
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if (!ap_parse(pstate, verb, pargi, argc, argv)) {
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mapper_reorder_usage(stderr, argv[0], verb);
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return NULL;
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}
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if (pfield_name_list == NULL) {
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mapper_reorder_usage(stderr, argv[0], verb);
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return NULL;
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}
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return mapper_reorder_alloc(pstate, pfield_name_list, put_at_end);
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}
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// ----------------------------------------------------------------
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static mapper_t* mapper_reorder_alloc(ap_state_t* pargp, slls_t* pfield_name_list, int put_at_end) {
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mapper_t* pmapper = mlr_malloc_or_die(sizeof(mapper_t));
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mapper_reorder_state_t* pstate = mlr_malloc_or_die(sizeof(mapper_reorder_state_t));
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pstate->pargp = pargp;
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pstate->pfield_name_list = pfield_name_list;
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pstate->put_at_end = put_at_end;
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if (!put_at_end)
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slls_reverse(pstate->pfield_name_list);
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pmapper->pvstate = (void*)pstate;
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pmapper->pprocess_func = mapper_reorder_process;
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pmapper->pfree_func = mapper_reorder_free;
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return pmapper;
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}
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static void mapper_reorder_free(mapper_t* pmapper) {
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mapper_reorder_state_t* pstate = pmapper->pvstate;
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if (pstate->pfield_name_list != NULL)
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slls_free(pstate->pfield_name_list);
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ap_free(pstate->pargp);
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free(pstate);
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free(pmapper);
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}
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// ----------------------------------------------------------------
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static sllv_t* mapper_reorder_process(lrec_t* pinrec, context_t* pctx, void* pvstate) {
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mapper_reorder_state_t* pstate = (mapper_reorder_state_t*)pvstate;
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if (pinrec != NULL) {
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if (!pstate->put_at_end) {
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// OK since the field-name list was reversed at construction time.
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for (sllse_t* pe = pstate->pfield_name_list->phead; pe != NULL; pe = pe->pnext)
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lrec_move_to_head(pinrec, pe->value);
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} else {
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for (sllse_t* pe = pstate->pfield_name_list->phead; pe != NULL; pe = pe->pnext)
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lrec_move_to_tail(pinrec, pe->value);
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}
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return sllv_single(pinrec);
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} else {
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return sllv_single(NULL);
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}
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}
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