[Tcl-bugs] [ tcl-Patches-827119 ] TIP 157 implementation

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Patches item #827119, was opened at 2003-10-20 17:31
Message generated for change (Comment added) made by msofer
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Category: 44. Parsing and Eval
Group: TIP Implementation
Status: Open
Resolution: None
Priority: 5
Submitted By: Don Porter (dgp)
Assigned to: miguel sofer (msofer)
Summary: TIP 157 implementation

Initial Comment:

Here's a first draft implementation
of TIP 157 as a patch to 
the HEAD.

Note changes to the public
interface.  Besides the
script level {expand} expansion,
a new Tcl_Token type

#define TCL_TOKEN_EXPAND_WORD 256

is in tcl.h and a new bytecode opcode

#define INST_LCONCAT1 100

is in tclCompile.h

Patch does not yet include documentation
or test updates.  Contributions for both
are welcome, as well as mucho banging
on it in search of bugs.

There are alternative implementation ideas
out there too, I'm sure, particularly on better
ways to handle bytecode compiling of the
{expand} operation.  Feel free to treat this
as the straw man.

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>Comment By: miguel sofer (msofer)
Date: 2003-10-20 19:05

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The new INST was missing in the tclInstructionTable
(tclCompile.c); patch updated.

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Comment By: Don Porter (dgp)
Date: 2003-10-20 17:45

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Probably worthwhile to note that
the controversial syntax choice
between TIPs 157 and 144 are
completely determined by line 337
of the patched tclParse.c.  Change

            static char expPfx[] = "expand";
to
            static char expPfx[] = "";

and this patch becomes an implementation
of TIP 144.

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