Tidy binding using DL

Kevin Howe · Sep 16, 2004

After reading the recent post re: Ruby's DL functions I decided to see if I
could come up with a Tidy binding. So far I have it setting/getting options,
doing CleanAndRepair and optionally saving to a file. However I'm not sure
how to get it to save to a string to be returned. The function in question
is tidyStringSave:

http://tidy.sourceforge.net/docs/api/group__Save.html#a3
int tidySaveString(TidyDoc tdoc, tmbstr buffer, uint * buflen)

I had envisioned it originally working like this:

output = String.new
Tidylib.tidySaveString(@tdoc, output)

But it's looking for a buffer object not a regular string. It's the last 2
parameters that I'm unsure of. What Ruby objects would I need to create/pass
to make this work?

Takaaki Tateishi · Sep 16, 2004

Kevin Howe said:

http://tidy.sourceforge.net/docs/api/group__Save.html#a3
int tidySaveString(TidyDoc tdoc, tmbstr buffer, uint * buflen)

Try the following code, since 'tmbstr' in tidy header files is
considered as 'char *' or 'const char *'.

-- test.rb --
require 'dl/import'

module Tidylib
extend DL::Importable

dlload "libtidy.so"

extern "void *tidyCreate()"
extern "int tidyParseString(void*,char*)"
extern "int tidySaveString(void*, char*, int ref)"

module_function

def create()
tidyCreate()
end

def parse_string(doc, str)
tidyParseString(doc, str)
end

def save_string(doc, out)
tidySaveString(doc, out, out.size)
return @args[2]
end
end

out = " "
doc = Tidylib.create()
Tidylib.parse_string(doc, <<EOS)
<html>
</html>
EOS
p Tidylib.save_string(doc, out)

Kevin Howe · Sep 16, 2004

Try the following code, since 'tmbstr' in tidy header files is

considered as 'char *' or 'const char *'.

This runs without errors, but returns a value of 68, with the "out" string
remaining unchanged.

Takaaki Tateishi · Sep 16, 2004

Kevin Howe said:

This runs without errors, but returns a value of 68, with the "out" string
remaining unchanged.

I corrected that as follows.

require 'dl/import'

module Tidylib
extend DL::Importable

dlload "libtidy.so"

extern "void *tidyCreate()"
extern "int tidyParseString(void*, char*)"
extern "int tidyCleanAndRepair(void*)"
extern "int tidySaveString(void*, char*, unsigned int ref)"
extern "int tidySaveStdout(void*)"
extern "int tidyRunDiagnostics(void*)"

module_function

def create()
tidyCreate()
end

def parse_string(doc, str)
tidyParseString(doc, str)
end

def clean_and_repair(doc)
tidyCleanAndRepair(doc)
end

def save_string(doc)
str = " " * 1024
ret = tidySaveString(doc, str, str.size)
len = @args[2]
str = @args[1]
str[0,len]
end

def save_stdout(doc)
tidySaveStdout(doc)
end

def run_diagnostics(doc)
tidyRunDiagnostics(doc)
end
end

doc = Tidylib.create()
Tidylib.parse_string(doc, <<EOS)
<title></title>
EOS
Tidylib.clean_and_repair(doc)
Tidylib.run_diagnostics(doc)
puts Tidylib.save_string(doc)

Kevin Howe · Sep 16, 2004

Try the following code, since 'tmbstr' in tidy header files is

considered as 'char *' or 'const char *'

Go it. The extern statement was correct, but the buffer string still wasn't
big enough to hold the results. The following takes care of it:

buffer = String.new # string buffer
8192.times { buffer << ' ' } # must be long enough to hold results
Tidylib.tidySaveString(@doc, buffer, buffer.length)
output = buffer.strip

Florian Gross · Sep 17, 2004

Kevin said:
buffer = String.new # string buffer
8192.times { buffer << ' ' } # must be long enough to hold results

Why not simply ' ' * 8192?

Regards,
Florian Gross

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Tidy binding using DL

Kevin Howe

Takaaki Tateishi

Kevin Howe

Takaaki Tateishi

Kevin Howe

Florian Gross

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