lestes::lang::cplus::lex::encoder_ascii7 Class Reference

7 bit ASCII encoder. More...

#include <encoder_ascii7.hh>

Inheritance diagram for lestes::lang::cplus::lex::encoder_ascii7:

List of all members.

Public Member Functions
ptr< ucn_token >	read (void)
	Reads next token.
Static Public Member Functions
static ptr< encoder_ascii7 >	create (void)
	Returns new instance.
Protected Member Functions
	encoder_ascii7 (void)
	Creates the object.
virtual void	gc_mark (void)
	Marks the object.
Private Member Functions
	encoder_ascii7 (const encoder_ascii7 &)
	Hides copy constructor.
encoder_ascii7 &	operator= (const encoder_ascii7 &)
	Hides assignment operator.
Private Attributes
srp< ucn_token >	bad
	Flag of correctness of the stream and also eof token.

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Detailed Description

7 bit ASCII encoder.

Performs encoding from 7 bit ASCII character set into internal source character set. Expects the input filter to return external characters in ASCII 7 bit, which are encoded into internal representation.

Definition at line 55 of file encoder_ascii7.hh.

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Constructor & Destructor Documentation

lestes::lang::cplus::lex::encoder_ascii7::encoder_ascii7

(

void

)

[protected]

Creates the object.

Creates the encoder.

Definition at line 53 of file encoder_ascii7.cc.

Referenced by create().

{
}

lestes::lang::cplus::lex::encoder_ascii7::encoder_ascii7

(

const encoder_ascii7 &

)

[private]

Hides copy constructor.

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Member Function Documentation

ptr< ucn_token > lestes::lang::cplus::lex::encoder_ascii7::read

(

void

)

[virtual]

Reads next token.

Reads next token. Performs encoding from 7 bit ASCII character set. Checks whether the input contains valid characters. If error is encountered, it returns token with type ucn_token::TOK_ERROR.

Precondition:

Input into the filter is set.

Returns:

The next token encoded from 7 bit ASCII.

Token with type ucn_token::TOK_ERROR if the source character is invalid (out of range).

Token with type ucn_token::TOK_EOF in case of previous error.

Implements lestes::lang::cplus::lex::ucn_filter.

Definition at line 66 of file encoder_ascii7.cc.

References lestes::lang::cplus::lex::ucn_token::create_error(), lestes::lang::cplus::lex::ucn_filter::input_read(), lestes::lang::cplus::lex::invalid_ascii_character, and lestes::lang::cplus::lex::ucn_token::TOK_NOT_EOF.

{
        ptr<ucn_token> t = input_read();
        ulint x = character::extract_value(t->value_get());
        ucn_token_type utt = t->type_get();

        if (utt == ucn_token::TOK_NOT_EOF) {
                // check that the value is in range 0..127
                if ((x & 0x7F) != x) {
                        // TODO report error: value out of range for ASCII
                        t = ucn_token::create_error(invalid_ascii_character->format());
                } else {
                        // encode value in source charset
                        t = t->clone_value(character::create_internal(x));
                }
        }

        return t;
}

ptr< encoder_ascii7 > lestes::lang::cplus::lex::encoder_ascii7::create

(

void

)

[static]

Returns new instance.

Returns new instance of the encoder.

Returns:

The new instance.

Definition at line 99 of file encoder_ascii7.cc.

References encoder_ascii7().

Referenced by lestes::lang::cplus::lex::evaluator::push_stream().

{
        return new encoder_ascii7();
}

void lestes::lang::cplus::lex::encoder_ascii7::gc_mark

(

void

)

[protected, virtual]

Marks the object.

Marks the object.

Reimplemented from lestes::lang::cplus::lex::ucn_filter.

Definition at line 89 of file encoder_ascii7.cc.

References bad, and lestes::lang::cplus::lex::ucn_filter::gc_mark().

{
        bad.gc_mark();
        encoder::gc_mark();
}

encoder_ascii7& lestes::lang::cplus::lex::encoder_ascii7::operator=

(

const encoder_ascii7 &

)

[private]

Hides assignment operator.

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Member Data Documentation

srp<ucn_token> lestes::lang::cplus::lex::encoder_ascii7::bad [private]

Flag of correctness of the stream and also eof token.

Definition at line 68 of file encoder_ascii7.hh.

Referenced by gc_mark().

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The documentation for this class was generated from the following files:

• encoder_ascii7.hh
• encoder_ascii7.cc

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