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https://github.com/johnkerl/miller.git
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107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
#include <stdio.h>
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#include "cli/argparse.h"
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#include "lib/mlrutil.h"
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#include "lib/mtrand.h"
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#include "containers/sllv.h"
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#include "mapping/mappers.h"
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typedef struct _mapper_altkv_state_t {
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ap_state_t* pargp;
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} mapper_altkv_state_t;
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static void mapper_altkv_usage(FILE* o, char* argv0, char* verb);
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static mapper_t* mapper_altkv_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_altkv_alloc(ap_state_t* pargp);
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static void mapper_altkv_free(mapper_t* pmapper, context_t* _);
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static sllv_t* mapper_altkv_process(lrec_t* pinrec, context_t* pctx, void* pvstate);
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// ----------------------------------------------------------------
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mapper_setup_t mapper_altkv_setup = {
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.verb = "altkv",
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.pusage_func = mapper_altkv_usage,
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.pparse_func = mapper_altkv_parse_cli,
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.ignores_input = FALSE,
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};
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// ----------------------------------------------------------------
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static void mapper_altkv_usage(FILE* o, char* argv0, char* verb) {
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fprintf(o, "Usage: %s %s [no options]\n", argv0, verb);
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fprintf(o, "Given fields with values of the form a,b,c,d,e,f emits a=b,c=d,e=f pairs.\n");
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}
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static mapper_t* mapper_altkv_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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if ((argc - *pargi) < 1) {
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mapper_altkv_usage(stderr, argv[0], argv[*pargi]);
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return NULL;
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}
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char* verb = argv[*pargi];
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*pargi += 1;
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ap_state_t* pstate = ap_alloc();
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if (!ap_parse(pstate, verb, pargi, argc, argv)) {
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mapper_altkv_usage(stderr, argv[0], verb);
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return NULL;
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}
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mapper_t* pmapper = mapper_altkv_alloc(pstate);
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return pmapper;
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}
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// ----------------------------------------------------------------
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static mapper_t* mapper_altkv_alloc(ap_state_t* pargp) {
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mapper_t* pmapper = mlr_malloc_or_die(sizeof(mapper_t));
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mapper_altkv_state_t* pstate = mlr_malloc_or_die(sizeof(mapper_altkv_state_t));
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pstate->pargp = pargp;
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pmapper->pvstate = pstate;
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pmapper->pprocess_func = mapper_altkv_process;
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pmapper->pfree_func = mapper_altkv_free;
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return pmapper;
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}
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static void mapper_altkv_free(mapper_t* pmapper, context_t* _) {
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mapper_altkv_state_t* pstate = pmapper->pvstate;
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// Free the container
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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_altkv_process(lrec_t* pinrec, context_t* pctx, void* pvstate) {
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if (pinrec == NULL) { // End of input stream: emit null.
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return sllv_single(NULL);
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}
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lrec_t* poutrec = lrec_unbacked_alloc();
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int output_field_number = 1;
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for (lrece_t* pe = pinrec->phead; pe != NULL; /* increment in loop */) {
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if (pe->pnext == NULL) { // Odd-numbered field count
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char* key = mlr_alloc_string_from_int(output_field_number);
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char* value = mlr_strdup_or_die(pe->value);
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lrec_put(poutrec, key, value, FREE_ENTRY_KEY | FREE_ENTRY_VALUE);
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} else {
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char* key = mlr_strdup_or_die(pe->value);
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char* value = mlr_strdup_or_die(pe->pnext->value);
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lrec_put(poutrec, key, value, FREE_ENTRY_KEY | FREE_ENTRY_VALUE);
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}
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output_field_number++;
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pe = pe->pnext;
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if (pe == NULL) {// Odd-numbered field count
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break;
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}
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pe = pe->pnext;
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}
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lrec_free(pinrec);
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return sllv_single(poutrec);
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}
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