start revising csvload for vipssource
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John Cupitt
parent
9e6df7e0a6
commit
2d14554e44
@ -50,18 +50,43 @@
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#include "pforeign.h"
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/* The largest item we can read. It only needs to be big enough for a double.
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*/
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#define MAX_ITEM_SIZE (256)
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typedef struct _VipsForeignLoadCsv {
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VipsForeignLoad parent_object;
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/* Filename for load.
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/* Set by subclasses.
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*/
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char *filename;
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VipsSource *source;
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/* Buffered source.
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*/
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VipsSbuf *sbuf;
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/* Load options.
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*/
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int skip;
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int lines;
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const char *whitespace;
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const char *separator;
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/* Current position in file for error messages.
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*/
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int lineno;
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int colno;
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/* Our whitespace and separator strings turned into LUTs.
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*/
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char whitemap[256];
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char sepmap[256];
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/* Fetch items into this buffer. It just needs to be large enough for
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* a double.
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*/
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char item[MAX_ITEM_SIZE];
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} VipsForeignLoadCsv;
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typedef VipsForeignLoadClass VipsForeignLoadCsvClass;
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@ -83,6 +108,167 @@ vips_foreign_load_csv_get_flags( VipsForeignLoad *load )
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return( vips_foreign_load_csv_get_flags_filename( csv->filename ) );
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}
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/* Skip to the start of the next block of non-whitespace.
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*
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* FIXME ... we should have something to stop \n appearing in whitespace
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*/
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static int
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vips_foreign_load_csv_skip_white( VipsForeignLoadCsv *csv )
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{
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int ch;
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do {
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ch = VIPS_SBUF_GETC( csv->sbuf );
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} while( ch != EOF &&
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ch != '\n' &&
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csv->whitemap[ch] );
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VIPS_SBUF_UNGETC( csv->sbuf );
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return( ch );
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}
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/* We have just seen " (open quotes). Skip to just after the matching close
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* quotes.
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*
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* If there is no matching close quotes before the end of the line, don't
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* skip to the next line.
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*/
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static int
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vips_foreign_load_csv_skip_quoted( VipsForeignLoadCsv *csv )
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{
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int ch;
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do {
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ch = VIPS_SBUF_GETC( csv->sbuf );
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/* Ignore \" in strings.
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*/
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if( ch == '\\' )
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ch = VIPS_SBUF_GETC( csv->sbuf );
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else if( ch == '"' )
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break;
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} while( ch != EOF &&
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ch != '\n' );
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if( ch == '\n' )
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VIPS_SBUF_UNGETC( csv->sbuf );
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return( ch );
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}
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/* Fetch the next item, as a string. The string is valid until the next call
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* to fetch item.
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*/
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static const char *
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vips_foreign_load_csv_fetch_item( VipsForeignLoadCsv *csv )
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{
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int write_point;
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int space_remaining;
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int ch;
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write_point = 0;
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space_remaining = MAX_ITEM_SIZE;
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while( (ch = VIPS_SBUF_GETC( csv->sbuf )) != -1 &&
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ch != '\n' &&
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!csv->whitemap[ch] &&
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!csv->sepmap[ch] &&
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space_remaining > 0 ) {
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csv->item[write_point] = ch;
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write_point += 1;
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space_remaining -= 1;
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}
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csv->item[write_point] = '\0';
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/* If we hit EOF immediately, return EOF.
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*/
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if( ch == -1 &&
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write_point == 0 )
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return( NULL );
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/* If we filled the item buffer without seeing the end of the item,
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* keep going.
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*/
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if( space_remaining == 0 &&
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ch != '\n' &&
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!csv->whitemap[ch] &&
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!csv->sepmap[ch] ) {
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while( (ch = VIPS_SBUF_GETC( sbuf )) != -1 &&
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ch != '\n' &&
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!csv->whitemap[ch] &&
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!csv->sepmap[ch] )
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;
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}
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return( csv->item );
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}
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/* Read a single item. The syntax is:
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*
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* element :
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* whitespace* item whitespace* [EOF|EOL|separator]
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*
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* item :
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* double |
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* "anything" |
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* empty
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*
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* the anything in quotes can contain " escaped with \, and can contain
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* separator and whitespace characters.
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*
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* Return the char that caused failure on fail (EOF or \n).
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*/
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static int
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vips_foreign_load_csv_read_double( VipsForeignLoadCsv *csv, double *out )
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{
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int ch;
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/* The fscanf() may change this ... but all other cases need a zero.
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*/
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*out = 0;
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ch = vips_foreign_load_csv_skip_white( csv );
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if( ch == EOF ||
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ch == '\n' )
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return( ch );
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if( ch == '"' ) {
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(void) VIPS_SBUF_GETC( csv->sbuf );
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(void) vips_foreign_load_csv_skip_quoted( fp );
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}
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else if( !csv->sepmap[ch] ) {
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\\
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g_ascii_strtod(
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fscanf( fp, "%lf", out ) != 1 ) {
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/* Only a warning, since (for example) exported spreadsheets
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* will often have text or date fields.
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*/
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g_warning( _( "error parsing number, line %d, column %d" ),
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lineno, colno );
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if( fail )
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return( EOF );
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/* Step over the bad data to the next separator.
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*/
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(void) skip_to_sep( fp, sepmap );
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}
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/* Don't need to check result, we have read a field successfully.
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*/
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ch = skip_white( fp, whitemap );
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/* If it's a separator, we have to step over it.
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*/
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if( ch != EOF &&
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sepmap[ch] )
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(void) vips__fgetc( fp );
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return( 0 );
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}
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static int
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vips_foreign_load_csv_header( VipsForeignLoad *load )
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{
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