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sheet: Use the transformation API to do filtering
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1 @@ | ||
| !*.out |
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| Original file line number | Diff line number | Diff line change |
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| Row # HA1 HA2 HA3 HB1 HB2 HB3 HC1 HC2 HC3 Column count | ||
| 4094 A4094 B4094 C4094 12285 | ||
| 4095 A4095 B4095 C4095 12288 | ||
| 4096 A4096 B4096 C4096 12291 | ||
| ? for help 4096 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| #include <stdlib.h> | ||
| #include <pthread.h> | ||
| #include <string.h> | ||
| #include <zsv/utils/mem.h> | ||
| #include <zsv/ext/sheet.h> | ||
| #include "transformation.h" | ||
| #include "handlers_internal.h" | ||
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| struct filtered_file_ctx { | ||
| char *filter; | ||
| size_t filter_len; | ||
| size_t row_num; // 1-based row number (1 = header row, 2 = first data row) | ||
| size_t passed; | ||
| unsigned char seen_header : 1; | ||
| unsigned char has_row_num : 1; | ||
| unsigned char _ : 7; | ||
| }; | ||
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| static void zsvsheet_save_filtered_file_row_handler(zsvsheet_transformation trn) { | ||
| struct filtered_file_ctx *ctx = zsvsheet_transformation_user_context(trn); | ||
| zsv_parser parser = zsvsheet_transformation_parser(trn); | ||
| zsv_csv_writer writer = zsvsheet_transformation_writer(trn); | ||
| size_t col_count = zsv_cell_count(parser); | ||
| ctx->row_num++; | ||
| if (col_count == 0) | ||
| return; | ||
|
|
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| struct zsv_cell first_cell = zsv_get_cell(parser, 0); | ||
| if (ctx->seen_header) { | ||
| struct zsv_cell last_cell = zsv_get_cell(parser, col_count - 1); | ||
| if (!memmem(first_cell.str, last_cell.str - first_cell.str + last_cell.len, ctx->filter, ctx->filter_len)) | ||
| return; | ||
| // future enhancement: optionally, handle if row may have unusual quotes e.g. cell1,"ce"ll2,cell3 | ||
| } else { | ||
| ctx->seen_header = 1; | ||
| if (first_cell.len == ZSVSHEET_ROWNUM_HEADER_LEN && !memcmp(first_cell.str, ZSVSHEET_ROWNUM_HEADER, first_cell.len)) | ||
| ctx->has_row_num = 1; | ||
| } | ||
|
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| char row_started = 0; | ||
| if (!ctx->has_row_num) { | ||
| // create our own rownum column | ||
| row_started = 1; | ||
| if (ctx->row_num == 1) | ||
| zsv_writer_cell_s(writer, 1, (const unsigned char *)"Row #", 0); // to do: consolidate "Row #" | ||
| else | ||
| zsv_writer_cell_zu(writer, 1, ctx->row_num - 1); | ||
| } | ||
| for (size_t i = 0; i < col_count; i++) { | ||
| struct zsv_cell cell = zsv_get_cell(parser, i); | ||
| zsv_writer_cell(writer, i == 0 && row_started == 0, cell.str, cell.len, cell.quoted); | ||
| } | ||
|
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| ctx->passed++; | ||
| } | ||
|
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| static void zsvsheet_filter_file_on_done(zsvsheet_transformation trn) { | ||
| struct filtered_file_ctx *ctx = zsvsheet_transformation_user_context(trn); | ||
| struct zsvsheet_ui_buffer *uib = trn->ui_buffer; | ||
|
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| char *status = NULL; | ||
| asprintf(&status, "(%zu filtered rows) ", ctx->passed - 1); | ||
|
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| pthread_mutex_lock(&uib->mutex); | ||
| char *old_status = uib->status; | ||
| uib->status = status; | ||
| pthread_mutex_unlock(&uib->mutex); | ||
|
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| free(old_status); | ||
| free(ctx->filter); | ||
| } | ||
|
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| static enum zsvsheet_status zsvsheet_filter_file(zsvsheet_proc_context_t proc_ctx, const char *row_filter) { | ||
| struct filtered_file_ctx ctx = { | ||
| .seen_header = 0, | ||
| .row_num = 0, | ||
| .passed = 0, | ||
| .has_row_num = 0, | ||
| .filter = strdup(row_filter), | ||
| .filter_len = strlen(row_filter), | ||
| }; | ||
| struct zsvsheet_buffer_transformation_opts opts = { | ||
| .user_context = zsv_memdup(&ctx, sizeof(ctx)), | ||
| .row_handler = zsvsheet_save_filtered_file_row_handler, | ||
| .on_done = zsvsheet_filter_file_on_done, | ||
| }; | ||
|
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||
| return zsvsheet_push_transformation(proc_ctx, opts); | ||
| } |
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