mittelmark/yeti

Yeti - parser and scanner generator for Tcl

Yeti - parser and scanner generator for Tcl

This is a fork of the yeti package of Frank Pilhofer. The package has vanished from the internet. See the Tcl Wiki for more details. I added a few bugfixes, removed the tcl++ support and bumpbed the package version to 0.5 to distinguish it clearly from the Frank Pilhofer's version. The Copyright stays at it is, a BSD License. Then the code was backported using a version from Steve Havelka which fixed an issue in yeti.tcl and who removed tcl++ support. So the version is now 0.4.2 - the same which is available in LUCK.

The itcl++ compatible code generation was now removed but you can your self add the catch below your self on top if you need this.

if {[catch {package require Itcl}]} {
    if {[file exists [file join [file dirname [info script]] .. tcl++]]} {
        lappend auto_path [file join [file dirname [info script]] ..]
    } elseif {[file exists [file join [file dirname [info script]] tcl++]]} {
        lappend auto_path [file dirname [info script]]
    }
    package require tcl++
    interp alias {} itcl::class {} tcl++::class
}

The tools yeti and ylex do not work, in contrast to their counterparts taccle and fickle, on straight text files as inputs but on procedure calls, and that it requires Itcl or tcl++ to be present. The advantgage of yeti and ylex is that they can create lexers and parsers on the fly without the need to have this text file processing. Furthermore, yeti and ylex read as input just strings and not file handles.

2021-10-02 - The direct support for tcl++ will be added later if I upload tcl++ version 2.3 and have checked if it still works with Tcl 8.6 and Tcl 8.7.

2021-10-03 - The cutdown version of tcl++ can be already used as alternative to Itcl in the generated scanner or parser if the following lines are used to replace the package require Itcl call on top:

if {[catch {package require Itcl}]} {
    lappend auto_path [file dirname [info script]]
    package require tcl++
    interp alias {} itcl::class {} tcl++::class
    package provide Itcl 3.0
} 

You just have to place the tcl++ folder directly below of your scanner/parser. The scanner should then run even when Itcl is not not available.

Manual pages

• yeti.html
• ylex.html

Demos

• wc implementation using ylex
• PgnReader demo
• PgnReader output
• PgnReader HTML manual
• sample.pgn - sample games for PgnReader demo
• cscanner demo
• cparser demo

Links

• tcl-json - ylex/yeti based json parser with type support
• yeti-wikipage

yeti's Issues

Error encountered using yeti 5.0

Hi Detlef,
when using your version with the files I copied from the page 'Parsing C types' on Tcl's wiki I got the following error:
missing close-brace: possible unbalanced brace in comment
while executing
"itcl::class CParser {"
(file "tmp/cparser.tcl" line 13)
invoked from within
"source tmp/$file.tcl"
("foreach" body line 11)
invoked from within
"foreach {file class} {cscanner CScannerGenerator cparser CParserGenerator} {
if {![file exists tmp/$file.tcl]
|| [file mtime $file.tcl] > [fi..."
(file "driver.tcl" line 221)

Wenn I used my previous version of Yeti the error was gone.
Maybe you can have a look.
Best regards
Helmut
PS: My email address is [email protected]