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<title>FBB::CSV</title>
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<h1>FBB::CSV</h1>
<h2>libbobcat-dev_4.01.03-x.tar.gz</h2>
<h2>2005-2015</h2>
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<title>FBB::CSV(3bobcat)</title>
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<h1>FBB::CSV(3bobcat)</h1>
<h2>libbobcat-dev_4.01.03-x.tar.gz CSV convertor</h2>
<h2>2005-2015</h2>
<p>
<h2>NAME</h2>FBB::CSV - Converter for comma separated values
<p>
<h2>SYNOPSIS</h2>
<strong>#include <bobcat/csv></strong><br>
<p>
Linking option: <em>-lbobcat</em>
<p>
<h2>DESCRIPTION</h2>
<p>
Objects of the class <strong>CSV</strong> can be used to convert series of comma separated
values to the individual separated values. These values may be converted
(individually or as a group) to standard integral types <em>int, size_t, long
long,</em> etc., to floating point types (<em>float, double, long double</em>), or they
can be accessed as <em>std::string</em> values.
<p>
<h2>NAMESPACE</h2>
<strong>FBB</strong><br>
All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace <strong>FBB</strong>.
<p>
<h2>INHERITS FROM</h2>
-
<p>
<h2>TYPEDEFS AND ENUMS</h2>
<p>
The <strong>enum Mode</strong> specifies how a <strong>CSV</strong> is extracted from
<em>std::istream</em> objects:
<ul>
<li> <em>TRAILINGCOMMA</em> a series of comma-separated values ends at a final
comma, which is removed from the <em>istream</em> by the <strong>CSV</strong> extraction
operator.
<li> <em>LINE</em> after extracting a <strong>CSV</strong> object any remaining characters on
the current <em>std::istream</em> line are ignored (i.e., the extraction
operator reads full lines of input).
</ul>
These enumeration values may be combined using the <em>bit-or</em> operator.
<p>
The <strong>enum InsertType</strong> specifies how a <strong>CSV</strong> is inserted into
<em>std::ostream</em> objects:
<ul>
<li> <em>LENGTH</em> indicates that all specifications (i.e., the <em>length</em> of the
type-specifications, see the member <em>length</em> below), are inserted
into the <em>std::ostream</em> as a series of comma-separated values.
<li> <em>SIZE</em> indicates that all (not ignored) comma-separated fields (i.e.,
the <em>size</em> of the fields vector, see the member <em>size</em>
below), are inserted into the <em>std::ostream</em> as a series of
comma-separated values.
<li> <em>COUNT</em> indicates that all valid (i.e., the <em>count</em> of the
valid fields, see the member <em>count</em> below), are inserted
into the <em>std::ostream</em> as a series of comma-separated values.
</ul>
<p>
The class <em>CSV</em> defines the nested classes <em>const_iterator</em> and
<em>const_reverse_iterator</em> which are <em>InputIterators</em>, which can be used
to iterate over the sequence of comma-separated values.
<p>
<h2>CONSTRUCTORS</h2>
<ul>
<li> <strong>CSV(std::string const &specification, Mode mode = LINE, InsertType =
LENGTH)</strong>:<br>
The specification in <em>specification</em> defines the subsequent fields
of the comma-separated value. Specifications are
<blockquote>
<ul>
<li> <em>S</em>: the field is left as-is, and can be retrieved as a
<em>std::string</em>.
<li> <em>I</em>: the field represents an <em>int</em> value;
<li> <em>D</em>: the field represents a <em>double</em> value;
<li> <em>X</em> or <em>-</em>: the field is ignored and is not stored inside the
<strong>CSV</strong> object. E.g., with the specification <em>SXS</em> two
fields will actually be stored inside the <strong>CSV</strong> object:
field 0 contains the first field extracted from the input
stream, field 1 contains the third field extracted from the
input stream.
</ul>
</blockquote>
Specifications may be separated by space or tab characters, which are
ignored. The number of specification characters determines the number
of fields that are stored in a <strong>CSV</strong> object. The final field may or
may not be followed by a comma.
<p>
Each specification may also be followed by a positive integral value,
indicating that the input at that point contains that number of
comma-separated fields of the specified type.
<p>
By default the <strong>CSV</strong> extraction operator extracts complete lines
from the stream from which a <strong>CSV</strong> object is extracted.
<p>
When inserting a <strong>CSV</strong> object into a <em>std::ostream</em> object all
fields that are specified by `<em>specification</em>' will be
inserted. Ignored fields will be inserted as single blanks.
</ul>
The default, copy, and move constructors are available.
<p>
<h2>OVERLOADED OPERATORS</h2>
<ul>
<li> <strong>std::string const &operator[](size_t index) const</strong>:<br>
The contents of the indicated field is returned as a
<em>std::string</em>.
<p>
<li> <strong>std::istream &operator>>(std::istream &out, CSV const &csv)</strong>:<br>
The data fields stored within <em>csv</em> are inserted into <em>out</em> as a
series of comma-separated values. The fields are inserted according to
the latest <em>InsertType</em> specification:
<blockquote>
<ul>
<li> For <em>LENGTH</em> all fields are inserted according to their
original type specification, where <em>'X'</em> and <em>'-'</em> fields are
inserted as fields of single blank spaces;
<li> For <em>SIZE</em> all fields that are stored inside <em>csv</em> are
inserted `as-is';
<li> For <em>COUNT</em> all valid fields are inserted.
</ul></blockquote>
If <em>csv</em>'s <em>Mode</em> specification contains <em>TRAILINGCOMMA</em> then a
comma is expected and extracted beyond the last field; if it contains
<em>LINE</em> then any information that is found on the line beyond the
last field (including its terminating comma, if applicable) is ignored
(including the <em>'\n'</em> line terminator).
<p>
<li> <strong>std::ostream &operator<<(std::ostream &out, CSV const &csv)</strong>:<br>
The data fields stored within <em>csv</em> are inserted into <em>out</em> as a
series of comma-separated values. The fields are inserted according to
the latest <em>InsertType</em> specification:
<blockquote>
<ul>
<li> For <em>LENGTH</em> all fields are inserted according to their
original type specification, where <em>'X'</em> and <em>'-'</em> fields are
inserted as fields of single blank spaces;
<li> For <em>SIZE</em> all fields that are stored inside <em>csv</em> are
inserted `as-is';
<li> For <em>COUNT</em> all valid fields are inserted.
</ul></blockquote>
If <em>csv</em>'s <em>Mode</em> specification contains <em>TRAILINGCOMMA</em> then a
comma is inserted beyond the last field.
</ul>
<p>
The copy and move assignment operators are available.
<p>
<h2>MEMBER FUNCTIONS</h2>
<ul>
<li> <strong>CSV &append(char spec, std::string const &value = "")</strong>:<br>
A field <em>spec</em>, with textual representation <em>value</em> is added to the
object's current set of fiels. A specification <em>'X'</em> or
<em>'-'</em> is added to the object's set of specifications, but does not
add <em>value</em> to the currently stored set of values.
<p>
<li> <strong>std::vector<bool> const &available() const</strong>:<br>
A vector of <em>bool</em> values indicating which of the matching data
fields are valid (i.e., could be converted to its specification as
defined at construction time or by <em>setSpec</em>) is returned.
<p>
<li> <strong>CSV::const_iterator<Type> begin<Type == std::string>() const</strong>:<br>
This is a template member returning a <em>CSV::const_iterator</em> to the
object's first field. When dereferencing a <em>const_iterator</em> the
value it refers to is converted to the indicated <em>Type</em>. If the
conversion fails, the <em>Type</em>'s default value is returned.
<p>
<li> <strong>size_t count() const</strong>:<br>
The number of fields that could actually be converted to their
indicated types is returned. E.g., an empty field or a supposedly
numeric field whose contents cannot be converted to the indicated
numeric value won't be counted here.
<p>
<li> <strong>std::vector<std::string> const &data() const</strong>:<br>
The vector of fields stored inside the <strong>CSV</strong> object is returned.
<p>
<li> <strong>CSV::const_iterator<Type> end<Type == std::string>() const</strong>:<br>
This is a template member returning a <em>CSV::const_iterator</em> pointing
just beyond the <strong>CSV</strong> object's last field.
<p>
<li> <strong>Type field<Type = std::string>(size_t idx) const</strong>:<br>
This is a template member returning the contents of field <em>idx</em> as a
value of type <em>Type</em>. When <em>Type</em> equals <em>std::string</em> a
<em>std::string const &</em> is returned. For <em>Type</em> all integral and
floating types as well as <em>std::sting</em> are accepted. If field
<em>idx</em> cannot be converted to <em>Type</em> a <strong>std::exception</strong> is
thrown.
<p>
<li> <strong>Type get<Type = std::string>(size_t idx)</strong>:<br>
This is a template member returning the contents of field <em>idx</em> as a
value of type <em>Type</em>. When <em>Type</em> equals <em>std::string</em> a
<em>std::string const &</em> is returned. For <em>Type</em> all integral and
floating types as well as <em>std::sting</em> are accepted. If field
<em>idx</em> cannot be converted to <em>Type</em>, the <em>Type</em>'s default value
is returned.
<p>
<li> <strong>InsertType insertType() const</strong>:<br>
The object's current <em>InsertType</em> is returned.
<p>
<li> <strong>size_t length() const</strong>:<br>
The number of specifications (defined at construction time or by the
<em>setSpec</em> member) is returned. This count includes the number of
<em>X</em> and <em>-</em> specifications.
<p>
<li> <strong>CSV::Mode mode() const</strong>:<br>
The object's current <em>Mode</em> value is returned.
<p>
<li> <strong>std::string const &spec() const</strong>:<br>
The object's current field-type specifications are returned.
<p>
<li> <strong>CSV::const_reverse_iterator<Type> rbegin<Type == std::string>() const</strong>:<br>
This is a template member returning a <em>CSV::const_reverse_iterator</em>
to the object's last field. When dereferencing a
<em>const_reverse_iterator</em> the value it refers to is converted to the
indicated <em>Type</em>. If the conversion fails, the <em>Type</em>'s default
value is returned.
<p>
<li> <strong>CSV::const_iterator<Type> rend<Type == std::string>() const</strong>:<br>
This is a template member returning a <em>CSV::const_reverse_iterator</em>
pointing just before the <strong>CSV</strong> object's first field.
<p>
<li> <strong>void setInsertType(InsertType insertType)</strong>:<br>
The objects <em>InsertType</em> is changed to <em>insertType</em>. This has no
immediate effect, but is only interpreted with the insertion operator.
<p>
<li> <strong>void setMode(Mode mode)</strong>:<br>
The object's current <em>Mode</em> value is changed to <em>mode</em>. This has no
immediate effect, but is only interpreted with the insertion and
extraction operators.
<p>
<li> <strong>void setSpec(std::string const &spec)</strong>:<br>
The information stored inside the <strong>CSV</strong> object is erased, and a new
field-specification is defined from <em>spec</em>.
<p>
<li> <strong>size_t size() const</strong>:<br>
The number of fields is returned (the returned value equals the value
returned by <em>length</em> not counting the <em>X</em> and <em>-</em> fields).
</ul>
<p>
<h2>EXAMPLE</h2>
<pre>
#include <iostream>
#include <bobcat/csv>
using namespace std;
using namespace FBB;
int main()
{
CSV csv("I5 X2 S2 D3");
cin >> csv;
cout <<
"Nr. of field specs: " << csv.length() << "\n"
"Nr. of fields: " << csv.size() << "\n"
"Nr. of available fields: " << csv.count() << "\n"
"Field 2 as int via get: " << csv.get<int>(2) << "\n"
"Field 2 as int via available: " << csv.field<int>(2) << "\n"
"Field 3 via operator[]: " << csv[3] << "\n"
"Field 6 as string via get: " << csv.get<string>(6) << "\n"
"Field 6 as string via available: " << csv.field<string>(6) << "\n"
;
cout << "First element as string: " << *csv.begin() << "\n";
cout << "All elements as strings:\n";
copy(csv.begin(), csv.end(), ostream_iterator<string>(cout, " "));
cout << '\n';
cout << "All elements as ints:\n";
copy(csv.begin<int>(), csv.end<int>(), ostream_iterator<int>(cout, " "));
cout << '\n';
cout << "All elements as strings, backward:\n";
copy(csv.rbegin(), csv.rend(), ostream_iterator<string>(cout, " "));
cout << '\n';
cout << "All elements as ints, backward:\n";
copy(csv.rbegin<int>(), csv.rend<int>(), ostream_iterator<int>(cout, " "));
cout << '\n';
cout << "Insert LENGTH (default):\n" <<
csv << '\n';
csv.setInsertType(CSV::SIZE);
cout << "Insert SIZE:\n" <<
csv << '\n';
csv.setInsertType(CSV::COUNT);
cout << "Insert COUNT:\n" <<
csv << '\n';
}
</pre>
<p>
<h2>FILES</h2>
<em>bobcat/csv</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
<strong>bobcat</strong>(7)
<p>
<h2>BUGS</h2>
None Reported.
<p>
<h2>DISTRIBUTION FILES</h2>
<ul>
<li> <em>bobcat_4.01.03-x.dsc</em>: detached signature;
<li> <em>bobcat_4.01.03-x.tar.gz</em>: source archive;
<li> <em>bobcat_4.01.03-x_i386.changes</em>: change log;
<li> <em>libbobcat1_4.01.03-x_*.deb</em>: debian package holding the
libraries;
<li> <em>libbobcat1-dev_4.01.03-x_*.deb</em>: debian package holding the
libraries, headers and manual pages;
<li> <em>http://sourceforge.net/projects/bobcat</em>: public archive location;
</ul>
<p>
<h2>BOBCAT</h2>
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
<p>
<h2>COPYRIGHT</h2>
This is free software, distributed under the terms of the
GNU General Public License (GPL).
<p>
<h2>AUTHOR</h2>
Frank B. Brokken (<strong>f.b.brokken@rug.nl</strong>).
<p>
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