Re: Help with LPeg

[Christopher Tallman <cjtallman@...>]

On Thu, May 25, 2017 at 10:00 AM, Dirk Laurie <dirk.laurie@gmail.com> wrote:
> 2017-05-25 18:36 GMT+02:00 Christopher Tallman <cjtallman@gmail.com>:
>> Hi, I'm trying to accomplish a string find/replace on a Lua file,
>> essentially updating the values stored in a table with new values,
>> while preserving the structure, layout, and comments of the file (I
>> don't want to just serialize the table, since that would drop
>> formatting and comments).
>>
>> For example, let's say I have a file Lua file containing the following:
>>
>> <code>
>> -- Range descriptions
>> ranges = {
>>   [1] = {0, 100}, -- primary
>>   [2] = {101, 500}, -- secondary
>>   [3] = {500,1000}, -- final range
>> }
>> </code>
>>
>> I'm trying to write a lua program that will read in this file and the
>> values in the subtables with new values and write the file back out,
>> preserving the rest of the file.  I'm pretty sure this is a simple
>> problem to solve with LPeg, but I've never used it before.  I could
>> probably get this working with plain regex, but I would like to learn
>> something new in the process and try doing it with LPeg.  Any advice
>> or pointers on how I can get this to work?  Good resources for someone
>> unfamiliar with PEG?
>
> You could try:
>
> https://rawgit.com/dlaurie/lua-notes/master/lpeg-brief.html
>

This is more or less what I was hoping to find.  LPeg is something
that's always intrigued me, but it seemed like it has a steep learning
curve to use.

Thanks for the resource!