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Converting ACE from Subversion to Git

The ace-svn-to-git.sh script will use git-svn to convert ACE's Subversion repository to Git with the --stdlayout flag so the trunk, tags, and branches are handled mostly as expected (more below). The --prefix=svn/ option puts all of those tags and branches under the svn reference namespace, and the --authors-file option maps the Subversion author names to the current GitHub profiles of the three authors in ACE's history.

goodmami

Parsing JSON with Regular Expressions

When I learned of regular expression engines that support recursion I thought I could write a recursive-descent parser in regex. Since I've written JSON parsers a few times and it's a simple spec, I chose that as the test case. In the end I created two versions.

version 1

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Regular Expression Preprocessing (REPP)

Specification

Modules

Operators

Every operator must appear as the first character on a line (in column 0).

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# usage: python3 lark-parsimonious.py [TESTNUM]
#
#    Where TESTNUM is one of:
#
#      1. Parsimonious with the faster grammar (tree-only)
#      2. Parsimonious with the faster grammar (transform data)
#      3. Parsimonious with the slower grammar (tree-only)

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#!/usr/bin/env python3

# Copyright 2017 Michael Wayne Goodman <[email protected]>
# Licensed under the MIT license: https://opensource.org/licenses/MIT

import sys
import os
import gzip

import docopt

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#!/bin/bash

die() { echo "$1"; exit 1; }

usage() {
cat <<EOF
Usage: getargs [--help] [OPTION...] ARGUMENT...

Example usage of useful conventions for command-line argument parsing.

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# quote list: https://en.wikipedia.org/wiki/Quotation_mark
QUOTES = (
    '\u0022'  # quotation mark (")
    '\u0027'  # apostrophe (')
    '\u00ab'  # left-pointing double-angle quotation mark
    '\u00bb'  # right-pointing double-angle quotation mark
    '\u2018'  # left single quotation mark
    '\u2019'  # right single quotation mark
    '\u201a'  # single low-9 quotation mark
    '\u201b'  # single high-reversed-9 quotation mark

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def xpath_tokenizer(pattern, namespaces=None):
    for token in xpath_tokenizer_re.findall(pattern):
        tag = token[1]
        if tag and tag[0] != "{" and ":" in tag:
            try:    
                prefix, uri = tag.split(":", 1)
                if not namespaces:
                    raise KeyError
                yield token[0], "{%s}%s" % (namespaces[prefix], uri)
            except KeyError:

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#!/bin/bash

if [ $# -ne 2 ]; then
    echo 'usage: make-preference.sh PROFILE RESULT-ID'
    exit 1
fi

awk -F@ -v RES="$2" \
    '{ if($2 == RES) { printf("%d@-1@%d\n", $1, $2) } }' \
    < "$1"/result

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Demonstration of an ArcDiagram layout function with variably spaced nodes.

The alice.json dataset is the first line from Lewis Carroll's Alice in Wonderland, parsed with the Stanford Parser.