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// Copyright (C) 2005 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_TOKENIZER_KERNEL_1_CPp_
#define DLIB_TOKENIZER_KERNEL_1_CPp_
#include "tokenizer_kernel_1.h"
#include <iostream>
namespace dlib
{
// ----------------------------------------------------------------------------------------
tokenizer_kernel_1::
tokenizer_kernel_1 (
) :
headset(0),
bodyset(0),
have_peeked(false)
{
try
{
headset = new bool[UCHAR_MAX];
bodyset = new bool[UCHAR_MAX];
clear();
}
catch (...)
{
if (headset) delete [] headset;
if (bodyset) delete [] headset;
throw;
}
}
// ----------------------------------------------------------------------------------------
tokenizer_kernel_1::
~tokenizer_kernel_1 (
)
{
delete [] bodyset;
delete [] headset;
}
// ----------------------------------------------------------------------------------------
void tokenizer_kernel_1::
clear(
)
{
using namespace std;
in = 0;
streambuf = 0;
have_peeked = false;
head = "_" + lowercase_letters() + uppercase_letters();
body = "_" + lowercase_letters() + uppercase_letters() + numbers();
for (unsigned long i = 0; i < UCHAR_MAX; ++i)
{
headset[i] = false;
bodyset[i] = false;
}
for (string::size_type i = 0; i < head.size(); ++i)
headset[static_cast<unsigned char>(head[i])] = true;
for (string::size_type i = 0; i < body.size(); ++i)
bodyset[static_cast<unsigned char>(body[i])] = true;
}
// ----------------------------------------------------------------------------------------
void tokenizer_kernel_1::
set_stream (
std::istream& in_
)
{
in = &in_;
streambuf = in_.rdbuf();
have_peeked = false;
}
// ----------------------------------------------------------------------------------------
bool tokenizer_kernel_1::
stream_is_set (
) const
{
return (in != 0);
}
// ----------------------------------------------------------------------------------------
std::istream& tokenizer_kernel_1::
get_stream (
) const
{
return *in;
}
// ----------------------------------------------------------------------------------------
void tokenizer_kernel_1::
get_token (
int& type,
std::string& token
)
{
if (!have_peeked)
{
std::streambuf::int_type ch;
ch = streambuf->sbumpc();
switch (ch)
{
case EOF:
type = END_OF_FILE;
token.clear();
return;
case '\n':
type = END_OF_LINE;
token = "\n";
return;
case '\r':
case ' ':
case '\t':
type = WHITE_SPACE;
token = static_cast<char>(ch);
ch = streambuf->sgetc();
while ((ch == ' ' || ch == '\t' || ch == '\r') && ch != EOF)
{
token += static_cast<char>(ch);
ch = streambuf->snextc();
}
return;
default:
if (headset[static_cast<unsigned char>(ch)])
{
type = IDENTIFIER;
token = static_cast<char>(ch);
ch = streambuf->sgetc();
while ( bodyset[static_cast<unsigned char>(ch)] && ch != EOF )
{
token += static_cast<char>(ch);
ch = streambuf->snextc();
}
}
else if ('0' <= ch && ch <= '9')
{
type = NUMBER;
token = static_cast<char>(ch);
ch = streambuf->sgetc();
while (('0' <= ch && ch <= '9') && ch != EOF)
{
token += static_cast<char>(ch);
ch = streambuf->snextc();
}
}
else
{
type = CHAR;
token = static_cast<char>(ch);
}
return;
} // switch (ch)
}
// if we get this far it means we have peeked so we should
// return the peek data.
type = next_type;
token = next_token;
have_peeked = false;
}
// ----------------------------------------------------------------------------------------
int tokenizer_kernel_1::
peek_type (
) const
{
const_cast<tokenizer_kernel_1*>(this)->get_token(next_type,next_token);
have_peeked = true;
return next_type;
}
// ----------------------------------------------------------------------------------------
const std::string& tokenizer_kernel_1::
peek_token (
) const
{
const_cast<tokenizer_kernel_1*>(this)->get_token(next_type,next_token);
have_peeked = true;
return next_token;
}
// ----------------------------------------------------------------------------------------
void tokenizer_kernel_1::
swap (
tokenizer_kernel_1& item
)
{
exchange(in,item.in);
exchange(streambuf,item.streambuf);
exchange(head,item.head);
exchange(body,item.body);
exchange(bodyset,item.bodyset);
exchange(headset,item.headset);
exchange(have_peeked,item.have_peeked);
exchange(next_type,item.next_type);
exchange(next_token,item.next_token);
}
// ----------------------------------------------------------------------------------------
void tokenizer_kernel_1::
set_identifier_token (
const std::string& head_,
const std::string& body_
)
{
using namespace std;
head = head_;
body = body_;
for (unsigned long i = 0; i < UCHAR_MAX; ++i)
{
headset[i] = false;
bodyset[i] = false;
}
for (string::size_type i = 0; i < head.size(); ++i)
headset[static_cast<unsigned char>(head[i])] = true;
for (string::size_type i = 0; i < body.size(); ++i)
bodyset[static_cast<unsigned char>(body[i])] = true;
}
// ----------------------------------------------------------------------------------------
const std::string tokenizer_kernel_1::
get_identifier_head (
) const
{
return head;
}
// ----------------------------------------------------------------------------------------
const std::string tokenizer_kernel_1::
get_identifier_body (
) const
{
return body;
}
// ----------------------------------------------------------------------------------------
const std::string tokenizer_kernel_1::
lowercase_letters (
) const
{
return std::string("abcdefghijklmnopqrstuvwxyz");
}
// ----------------------------------------------------------------------------------------
const std::string tokenizer_kernel_1::
uppercase_letters (
) const
{
return std::string("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
}
// ----------------------------------------------------------------------------------------
const std::string tokenizer_kernel_1::
numbers (
) const
{
return std::string("0123456789");
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_TOKENIZER_KERNEL_1_CPp_
|
