Annotation of parser3/src/include/pa_table.h, revision 1.57
1.14 paf 1: /** @file
1.15 paf 2: Parser: table class decl.
3:
1.57 ! paf 4: Copyright (c) 2001-2004 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:
1.57 ! paf 11: static const char * const IDENT_TABLE_H="$Date: 2003/11/20 16:34:25 $";
1.1 paf 12:
13: #include "pa_types.h"
14: #include "pa_hash.h"
1.2 paf 15: #include "pa_string.h"
1.1 paf 16:
1.16 paf 17: /**
1.19 paf 18: VTable backend.
1.16 paf 19:
20: holds:
1.14 paf 21: - column names[if any]
22: - data rows
23: - current row pointer
24:
25: uses String for column names and data items
26:
1.28 paf 27: hence most of tables are "named", no need to uptimize nameless onces.
28: rows and strings stored are read-only. once stored they can be removed,
29: but not altered. that's handy for quick copying & co. see table:join
1.14 paf 30: */
1.52 paf 31: class Table: public Array<ArrayString*> {
1.1 paf 32: public:
1.52 paf 33: typedef ArrayString* columns_type;
1.2 paf 34:
1.52 paf 35: Table(
36: columns_type acolumns,
37: size_t initial_rows=3);
38: Table(const Table& src, Action_options& options);
1.21 paf 39:
1.42 paf 40: /// gets column names
1.52 paf 41: columns_type columns() { return fcolumns; }
1.42 paf 42:
1.52 paf 43: /// moves @a current pointer
44: void set_current(size_t acurrent) {
45: assert(acurrent==0 || acurrent<count());
1.5 paf 46:
1.52 paf 47: fcurrent=acurrent;
48: }
1.50 paf 49: /// @return current pointer
1.52 paf 50: size_t current() const { return fcurrent; }
1.37 paf 51: void offset(bool absolute, int offset);
1.5 paf 52:
1.52 paf 53: /** @return column index from @a column_name. '<0' if no such column
54: if no such - 'bark'
1.32 paf 55: */
56: int column_name2index(const String& column, bool bark) const;
1.30 paf 57:
1.26 paf 58: /// @return item from @a column
1.52 paf 59: const String* item(size_t column);
1.30 paf 60:
61: /// @return item from @a column. '0' if no such column
1.52 paf 62: const String* item(const String& column) {
1.32 paf 63: int index=column_name2index(column, false);
1.30 paf 64: return index>=0?item(index):0;
1.24 paf 65: }
1.23 paf 66:
67: /// saves to text file
68: void save(bool nameless_save, const String& file_spec);
1.2 paf 69:
1.52 paf 70: template<typename I>
71: void table_for_each(void (*func)(Table& self, I* info), I* info, Action_options& o) {
72: if(!o.adjust(count()))
73: return;
74:
75: size_t saved_current=current();
76: size_t row=o.offset;
77: if(o.reverse) { // reverse
78: for(size_t to=row-o.limit; row>=to; --row) {
79: set_current(row);
80: func(*this, info);
81: }
82: } else { // forward
83: for(size_t to=row+o.limit; row<to; row++) {
84: set_current(row);
85: func(*this, info);
86: }
87: }
88: set_current(saved_current);
89: }
90:
91: template<typename I>
1.54 paf 92: bool table_first_that(bool (*func)(Table& self, I info), I info, Action_options& o) {
1.52 paf 93: if(!o.adjust(count()))
94: return false;
95:
96: size_t saved_current=current();
97: size_t row=o.offset;
98: if(o.reverse) { // reverse
99: for(size_t to=row-o.limit; row>=to; --row) {
100: set_current(row);
101:
102: if(func(*this, info))
103: return true;
104: }
105: } else { // forward
106: for(size_t to=row+o.limit; row<to; row++) {
107: set_current(row);
108:
109: if(func(*this, info))
110: return true;
111: }
112: }
113: set_current(saved_current);
114:
115: return false;
116: }
117:
118:
1.49 paf 119: bool locate(int column, const String& value, Action_options& options);
120: bool locate(const String& column, const String& value, Action_options& options);
1.24 paf 121:
1.12 paf 122: private:
1.21 paf 123:
1.52 paf 124: /// current row
125: size_t fcurrent;
1.1 paf 126:
1.52 paf 127: /// columns
128: columns_type fcolumns;
1.5 paf 129:
1.52 paf 130: /// column name->number lookup table
1.53 paf 131: typedef Hash<const String::Body, int> name2number_hash_class;
1.52 paf 132: name2number_hash_class* name2number;
1.5 paf 133:
1.52 paf 134: /// is that @c index falid?
1.55 paf 135: bool valid(size_t index) const { return index<count(); }
1.2 paf 136:
1.1 paf 137: };
138:
139: #endif
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