Annotation of parser3/src/include/pa_table.h, revision 1.45
1.14 paf 1: /** @file
1.15 paf 2: Parser: table class decl.
3:
1.40 paf 4: Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
1.41 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_TABLE_H
9: #define PA_TABLE_H
1.45 ! paf 10:
! 11: static const char* IDENT_TABLE_H="$Id: zzz $";
1.1 paf 12:
13: #include "pa_types.h"
14: #include "pa_array.h"
15: #include "pa_hash.h"
1.2 paf 16: #include "pa_string.h"
1.1 paf 17:
1.16 paf 18: /**
1.19 paf 19: VTable backend.
1.16 paf 20:
21: holds:
1.14 paf 22: - column names[if any]
23: - data rows
24: - current row pointer
25:
26: uses String for column names and data items
27:
1.28 paf 28: hence most of tables are "named", no need to uptimize nameless onces.
29: rows and strings stored are read-only. once stored they can be removed,
30: but not altered. that's handy for quick copying & co. see table:join
1.14 paf 31: */
1.1 paf 32: class Table : public Array {
33: public:
34:
1.11 paf 35: Table(Pool& apool,
1.21 paf 36: const String *aorigin,
1.34 parser 37: const Array *acolumns,
1.2 paf 38: int initial_rows=CR_INITIAL_ROWS_DEFAULT);
1.39 paf 39: Table(const Table& source);
1.43 paf 40: Table(Pool& apool, const Table& source, int offset=0);
1.2 paf 41:
1.21 paf 42: /// where this table came from, may be NULL
43: const String *origin_string() { return forigin_string; }
44:
1.42 paf 45: /// gets column names
1.5 paf 46: const Array *columns() { return fcolumns; }
1.42 paf 47:
48: /// assignes column names
49: void set_columns(const Array *acolumns) { fcolumns=acolumns; }
1.5 paf 50:
1.18 paf 51: /// moves @a current pointer
1.5 paf 52: void set_current(int acurrent) { fcurrent=acurrent; }
1.17 paf 53: /// @return current pointer
1.25 paf 54: int current() { return fcurrent; }
1.37 paf 55: void offset(bool absolute, int offset);
1.5 paf 56:
1.32 paf 57: /** @return column index from @a column_name. '<0' if no such column
58: if no such colum conditionally 'bark'
59: */
60: int column_name2index(const String& column, bool bark) const;
1.30 paf 61:
1.26 paf 62: /// @return item from @a column
63: const String *item(int column) const;
1.30 paf 64:
65: /// @return item from @a column. '0' if no such column
66: const String *item(const String& column) const {
1.32 paf 67: int index=column_name2index(column, false);
1.30 paf 68: return index>=0?item(index):0;
1.24 paf 69: }
1.23 paf 70:
71: /// saves to text file
72: void save(bool nameless_save, const String& file_spec);
1.2 paf 73:
1.26 paf 74: bool locate(int column, const String& value);
1.31 paf 75: bool locate(const String& column, const String& value);
1.24 paf 76:
1.27 paf 77: const Array& at(int index) const {
78: // force @c const result
79: return *const_cast<const Array *>(static_cast<Array *>(get(index)));
80: }
81:
1.12 paf 82: private:
1.21 paf 83:
84: // where this table came from, may be NULL
85: const String *forigin_string;
1.5 paf 86:
1.1 paf 87: // column name->number lookup table
1.44 paf 88: Hash& name2number;
1.1 paf 89:
1.5 paf 90: // current row
91: int fcurrent;
92:
93: // columns
1.34 parser 94: const Array *fcolumns;
1.5 paf 95:
1.24 paf 96: bool valid(int index) const { return index>=0 && index<size(); }
1.2 paf 97:
1.1 paf 98: };
99:
100: #endif
E-mail: