Wt examples: treeview-dragdrop/CsvUtil.C Source File

Wt examples 4.10.4

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CsvUtil.C
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1#include <fstream>
2
3#include <boost/tokenizer.hpp>
4
5#include <Wt/WAbstractItemModel.h>
6#include <Wt/WStandardItemModel.h>
7#include <Wt/WStandardItem.h>
8#include <Wt/WString.h>
9
10#include "CsvUtil.h"
11
12/*
13 * A standard item which converts text edits to numbers
14 */
15 class NumericItem : public WStandardItem {
16public:
17 virtual std::unique_ptr<WStandardItem> clone() const {
18 return std::unique_ptr<NumericItem>(std::make_unique<NumericItem>());
19 }
20
21 virtual void setData(const cpp17::any &data, ItemDataRole role = ItemDataRole::User) {
22 cpp17::any dt;
23
24 if (role == ItemDataRole::Edit) {
25 std::string s = asString(data).toUTF8();
26
27 char *end;
28 double d = std::strtod(s.c_str(), &end);
29 if (*end == 0)
30 dt = cpp17::any(d);
31 else
32 dt = data;
33 } else
34 dt = data;
35
36 WStandardItem::setData(dt, role);
37 }
38};
39
40std::shared_ptr<WStandardItemModel> csvToModel(const std::string& csvFile,
41 bool firstLineIsHeaders)
42{
43 std::ifstream f(csvFile.c_str());
44
45 if (f) {
46 std::shared_ptr<WStandardItemModel> result = std::make_shared<WStandardItemModel>(0, 0);
47 result->setItemPrototype(std::make_unique<NumericItem>());
48 readFromCsv(f, result, -1, firstLineIsHeaders);
49 return result;
50 } else
51 return nullptr;
52}
53
54 void readFromCsv(std::istream& f, std::shared_ptr<WAbstractItemModel> model,
55 int numRows, bool firstLineIsHeaders)
56{
57 int csvRow = 0;
58
59 while (f) {
60 std::string line;
61 getline(f, line);
62
63 if (f) {
64 typedef boost::tokenizer<boost::escaped_list_separator<char> >
65 CsvTokenizer;
66 CsvTokenizer tok(line);
67
68 int col = 0;
69 for (CsvTokenizer::iterator i = tok.begin();
70 i != tok.end(); ++i, ++col) {
71
72 if (col >= model->columnCount())
73 model->insertColumns(model->columnCount(),
74 col + 1 - model->columnCount());
75
76 if (firstLineIsHeaders && csvRow == 0)
77 model->setHeaderData(col, cpp17::any{WString{*i}});
78 else {
79 int dataRow = firstLineIsHeaders ? csvRow - 1 : csvRow;
80
81 if (numRows != -1 && dataRow >= numRows)
82 return;
83
84 if (dataRow >= model->rowCount())
85 model->insertRows(model->rowCount(),
86 dataRow + 1 - model->rowCount());
87
88 cpp17::any data{WString{*i}};
89 model->setData(dataRow, col, data);
90 }
91 }
92 }
93
94 ++csvRow;
95 }
96}
NumericItem
Definition CsvUtil.C:15
NumericItem::clone
virtual std::unique_ptr< WStandardItem > clone() const
Definition CsvUtil.C:17
NumericItem::setData
virtual void setData(const cpp17::any &data, ItemDataRole role=ItemDataRole::User)
Definition CsvUtil.C:21
csvToModel
std::shared_ptr< WStandardItemModel > csvToModel(const std::string &csvFile, bool firstLineIsHeaders)
Definition CsvUtil.C:40
readFromCsv
void readFromCsv(std::istream &f, std::shared_ptr< WAbstractItemModel > model, int numRows, bool firstLineIsHeaders)
Definition CsvUtil.C:54
CsvUtil.h