#! /usr/bin/env bash
#
# Copyright (c) 2020-now by the Zeek Project. See LICENSE for details.
#
# A helper script for manual diffing of two AST debug renderings, ignoring any
# content that's not stable between subsequent executions.

function filter
{
    # 1. Remove node addresses, including optional brackets/parentheses (e.g., [@i:60000266c520])
    # 2. Remove source locations (e.g., "(foo.spicy:2:3)").
    # 3. Replace node IDs (e.g., %42) with `%xxx`

    sed 's/ \{0,\}[[(]\{0,\}@.:[0-9a-z]*[])]\{0,\}//g' | \
    sed 's/ \{0,\}([^)]*:[0-9-]*:[0-9-]*)//g' | \
    sed 's/path="[^"]*"/path="xxx"/g' | \
    sed 's/%[0-9-]\{1,\}/%xxx/g'
}

if [ $# != 2 ]; then
    echo "usage: $(basename $0) <ast1> <ast2>"
    exit 1
fi

tmp1=/tmp/$(basename $0).$$.1
tmp2=/tmp/$(basename $0).$$.2

trap "rm -f ${tmp1} ${tmp2}" EXIT

cat $1 | filter >${tmp1}
cat $2 | filter >${tmp2}

diff -u ${tmp1} ${tmp2}