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changed Awk::parse() to accept a reference type instead of a pointer type

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hyung-hwan
2009-07-14 04:03:53 +00:00
parent 9b6eb94664
commit af6831ed3c
5 changed files with 58 additions and 23 deletions
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43
qse/include/qse/awk/Awk.hpp
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@ -1,5 +1,5 @@
/*
* $Id: Awk.hpp 230 2009-07-13 08:51:23Z hyunghwan.chung $
* $Id: Awk.hpp 231 2009-07-13 10:03:53Z hyunghwan.chung $
*
Copyright 2006-2009 Chung, Hyung-Hwan.
@ -58,6 +58,15 @@ public:
class Run;
friend class Run;
protected:
class NoSource;
public:
/**
* The Awk::Source class is an abstract class to encapsulate
* source script I/O. The Awk::parse function requires a concrete
* object instantiated from its child class.
*/
class Source
{
public:
@ -67,6 +76,10 @@ public:
WRITE /**< source code write. */
};
/**
* The Awk::Source::Data class is used to deliver information
* needed for source script I/O.
*/
class Data
{
public:
@ -116,11 +129,27 @@ public:
virtual ssize_t read (Data& io, char_t* buf, size_t len) = 0;
virtual ssize_t write (Data& io, char_t* buf, size_t len) = 0;
/**
* special value to indicate no source
*/
static NoSource NONE;
private:
Source (const Source&);
Source& operator= (const Source&);
};
protected:
class NoSource: public Source
{
public:
int open (Data& io) { return -1; }
int close (Data& io) { return 0; }
ssize_t read (Data& io, char_t* buf, size_t len) { return 0; }
ssize_t write (Data& io, char_t* buf, size_t len) { return 0; }
};
public:
/**
* The RIOBase class is a base class to represent runtime I/O context.
* The Console, File, Pipe classes inherit this class to implement
@ -861,14 +890,14 @@ public:
/**
* Parses the source code.
*
* Awk::parse parses the source code read from the input stream and
* writes the parse tree to the output stream. A child class should
* override Awk::openSource, Awk::closeSource, Awk::readSource,
* Awk::writeSource to implement the source code stream.
* Awk::parse parses the source code read from the input stream @a in
* and writes the parse tree to the output stream @out. To disable
* deparsing, you may set @a out to Awk::Source::NONE. However, it
* is not legal to specify Awk::Source::NONE for @a in.
*
* @return a Run object on success, QSE_NULL on failure
* @return a Run object on success, #QSE_NULL on failure
*/
virtual Awk::Run* parse (Source* in, Source* out);
virtual Awk::Run* parse (Source& in, Source& out);
/**
* Executes the BEGIN block, pattern-action blocks, and the END block.

16
qse/lib/awk/Awk.cpp
View File

@ -1,5 +1,5 @@
/*
* $Id: Awk.cpp 230 2009-07-13 08:51:23Z hyunghwan.chung $
* $Id: Awk.cpp 231 2009-07-13 10:03:53Z hyunghwan.chung $
*
Copyright 2006-2009 Chung, Hyung-Hwan.
@ -39,6 +39,8 @@ struct rxtn_t
Awk::Run* run;
};
Awk::NoSource Awk::Source::NONE;
//////////////////////////////////////////////////////////////////
// Awk::RIO
//////////////////////////////////////////////////////////////////
@ -1275,14 +1277,20 @@ int Awk::unsetAllWords ()
return qse_awk_setword (awk, QSE_NULL, 0, QSE_NULL, 0);
}
Awk::Run* Awk::parse (Source* in, Source* out)
Awk::Run* Awk::parse (Source& in, Source& out)
{
QSE_ASSERT (awk != QSE_NULL);
if (&in == &Source::NONE)
{
setError (ERR_INVAL);
return QSE_NULL;
}
fini_runctx ();
sourceReader = in;
sourceWriter = out;
sourceReader = &in;
sourceWriter = (&out == &Source::NONE)? QSE_NULL: &out;
qse_awk_sio_t sio;
sio.in = readSource;

2
qse/samples/awk/awk05.cpp
View File

@ -52,7 +52,7 @@ static int run_awk (QSE::StdAwk& awk)
QSE::StdAwk::SourceFile out (QSE_T("awk05.out"));
// parse the script string and deparse it to awk05.out.
if (awk.parse (&in, &out) == QSE_NULL) return -1;
if (awk.parse (in, out) == QSE_NULL) return -1;
// execute the BEGIN, pattern-action, END blocks.
return awk.loop ();

8
qse/samples/awk/awk06.cpp
View File

@ -43,7 +43,7 @@ static int run_awk (QSE::StdAwk& awk)
QSE::StdAwk::SourceFile out (QSE_T("awk06.out"));
// parse the script and deparse it to awk06.out
run = awk.parse (&in, &out);
run = awk.parse (in, out);
if (run == QSE_NULL) return -1;
QSE::StdAwk::Value arg[2];
@ -52,16 +52,16 @@ static int run_awk (QSE::StdAwk& awk)
// ret = add (-20, 51)
QSE::StdAwk::Value ret;
if (awk.call (QSE_T("add"), &ret, arg, 2) <= -1) return -1;
if (awk.call (QSE_T("add"), &ret, arg, QSE_COUNTOF(arg)) <= -1) return -1;
// ret = mul (ret, 51);
arg[0] = ret;
if (awk.call (QSE_T("mul"), &ret, arg, 2) <= -1) return -1;
if (awk.call (QSE_T("mul"), &ret, arg, QSE_COUNTOF(arg)) <= -1) return -1;
// ret = div (ret, 2);
arg[0] = ret;
if (arg[1].setReal (run, 2) <= -1) return -1;
if (awk.call (QSE_T("div"), &ret, arg, 2) <= -1) return -1;
if (awk.call (QSE_T("div"), &ret, arg, QSE_COUNTOF(arg)) <= -1) return -1;
// output the result in various types
qse_printf (QSE_T("RESULT: (int) [%lld]\n"), (long long)ret.toInt());

12
qse/samples/awk/awk07.cpp
View File

@ -33,7 +33,7 @@ static int run_awk (QSE::StdAwk& awk)
{
QSE::StdAwk::Run* run;
const qse_char_t* script = QSE_T(
QSE::StdAwk::SourceString in (QSE_T(
"function pa (x) {\n"
" reset ret;\n"
" for (i in x) { print i, \"=>\", x[i]; ret += x[i]; }\n"
@ -44,15 +44,13 @@ static int run_awk (QSE::StdAwk& awk)
" for (i in x) { ret[-i] = -x[i]; }\n"
" return ret;\n"
"}"
);
));
QSE::StdAwk::SourceString in (script);
QSE::StdAwk::SourceFile out (QSE_T("awk07.out"));
// parse the script and deparse it to awk07.out
run = awk.parse (&in, &out);
// parse the script and perform no deparsing
run = awk.parse (in, QSE::StdAwk::Source::NONE);
if (run == QSE_NULL) return -1;
// prepare an indexed parameter
QSE::StdAwk::Value arg[1];
for (int i = 1; i <= 5; i++)