Annotation of parser3/src/include/pa_table.h, revision 1.51
1.14 paf 1: /** @file
1.15 paf 2: Parser: table class decl.
3:
1.48 paf 4: Copyright (c) 2001, 2003 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:
1.51 ! paf 11: static const char* IDENT_TABLE_H="$Date: 2003/04/14 11:22:53 $";
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:
1.49 paf 34: struct Action_options {
1.51 ! paf 35: int offset;
! 36: int limit; //< negative limit means 'all'. zero limit means 'nothing'
! 37: bool reverse;
! 38: bool defined;
! 39:
! 40: Action_options(
! 41: int aoffset=0,
! 42: int alimit=-1,
! 43: bool areverse=false):
! 44: offset(aoffset), limit(alimit), reverse(areverse),
! 45: defined(false) {}
1.49 paf 46: };
1.1 paf 47:
1.11 paf 48: Table(Pool& apool,
1.21 paf 49: const String *aorigin,
1.34 parser 50: const Array *acolumns,
1.2 paf 51: int initial_rows=CR_INITIAL_ROWS_DEFAULT);
1.49 paf 52: Table(Pool& apool, const Table& source, Action_options& options);
1.2 paf 53:
1.21 paf 54: /// where this table came from, may be NULL
55: const String *origin_string() { return forigin_string; }
56:
1.42 paf 57: /// gets column names
1.5 paf 58: const Array *columns() { return fcolumns; }
1.42 paf 59:
60: /// assignes column names
61: void set_columns(const Array *acolumns) { fcolumns=acolumns; }
1.5 paf 62:
1.18 paf 63: /// moves @a current pointer
1.50 paf 64: void set_current(int acurrent) { fcurrent=acurrent; }
65:
66: /// @return current pointer
1.47 paf 67: int current() const { return fcurrent; }
1.37 paf 68: void offset(bool absolute, int offset);
1.5 paf 69:
1.32 paf 70: /** @return column index from @a column_name. '<0' if no such column
71: if no such colum conditionally 'bark'
72: */
73: int column_name2index(const String& column, bool bark) const;
1.30 paf 74:
1.26 paf 75: /// @return item from @a column
76: const String *item(int column) const;
1.30 paf 77:
78: /// @return item from @a column. '0' if no such column
79: const String *item(const String& column) const {
1.32 paf 80: int index=column_name2index(column, false);
1.30 paf 81: return index>=0?item(index):0;
1.24 paf 82: }
1.23 paf 83:
84: /// saves to text file
85: void save(bool nameless_save, const String& file_spec);
1.2 paf 86:
1.49 paf 87: typedef bool (*locate_func)(Table& self, void* info);
88: bool locate(locate_func func, void* info, Action_options& options);
89: bool locate(int column, const String& value, Action_options& options);
90: bool locate(const String& column, const String& value, Action_options& options);
1.24 paf 91:
1.27 paf 92: const Array& at(int index) const {
93: // force @c const result
94: return *const_cast<const Array *>(static_cast<Array *>(get(index)));
95: }
96:
1.12 paf 97: private:
1.21 paf 98:
99: // where this table came from, may be NULL
100: const String *forigin_string;
1.5 paf 101:
1.1 paf 102: // column name->number lookup table
1.44 paf 103: Hash& name2number;
1.1 paf 104:
1.5 paf 105: // current row
106: int fcurrent;
107:
108: // columns
1.34 parser 109: const Array *fcolumns;
1.5 paf 110:
1.24 paf 111: bool valid(int index) const { return index>=0 && index<size(); }
1.2 paf 112:
1.1 paf 113: };
114:
115: #endif
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