[PD] Parsing Pd patches in Javascript, Python, Java
Hans-Christoph Steiner
hans at at.or.at
Tue Nov 30 04:31:32 CET 2010
Sounds very useful, and would be great to have on the wiki, anywhere
in the docs/developer section, for example.
.hc
On Nov 28, 2010, at 11:46 PM, Chris McCormick wrote:
> Hi,
>
> Here is how you can parse Pd patches into rows of atoms in three
> languages using regular expressions:
>
> /*** Javascript ***/
>
> var lines_re = new RegExp("(#((.|\r|\n)*?)[^\\\\])\r{0,1}\n{0,1};
> \r{0,1}\n", "gi");
> for (pdline = lines_re.exec(patchtext)) {
> var atoms = pdline[1].split(/ |\r\n?|\n/);
> }
>
> ### Python ###
>
> lines_re = re.compile("(#(.*?)[^\\\])\r{0,1}\n{0,1};\r{0,1}\n",
> re.MULTILINE | re.DOTALL)
> split_re = re.compile(" |\r\n?|\n", re.MULTILINE)
> for found in lines_re.finditer(patch):
> line = found.group(1)
> atoms = split_re.split(line)
>
> /*** Java ***/
>
> private static final String line_re = "(#((.|\r|\n)*?)[^\\\\])
> \r{0,1}\n{0,1};\r{0,1}\n";
> private static final String token_re = " |\r\n?|\n";
>
> Pattern pattern = Pattern.compile(line_re, Pattern.MULTILINE);
> Pattern token_pattern = Pattern.compile(token_re, Pattern.MULTILINE);
> Matcher matcher = pattern.matcher(patchtext);
> ArrayList<String[]> atomlines = new ArrayList<String[]>();
> while (matcher.find()) {
> String[] s = token_pattern.split(matcher.group(1));
> atomlines.add(token_pattern.split(matcher.group(1)));
> }
>
> Also here is a regular expression for matching dollar args:
>
> /(?:\\{0,1}\$)(\d+)/g;
>
> Hopefully this is useful to someone else.
>
> Cheers,
>
> Chris.
>
> -------------------
> http://mccormick.cx
>
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