How to resolve the algorithm Read a configuration file step by step in the Raku programming language
Published on 12 May 2024 09:40 PM
How to resolve the algorithm Read a configuration file step by step in the Raku programming language
Table of Contents
Problem Statement
The task is to read a configuration file in standard configuration file format, and set variables accordingly. For this task, we have a configuration file as follows:
For the task we need to set four variables according to the configuration entries as follows:
We also have an option that contains multiple parameters. These may be stored in an array.
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Read a configuration file step by step in the Raku programming language
Source code in the raku programming language
my $fullname;
my $favouritefruit;
my $needspeeling = False;
my $seedsremoved = False;
my @otherfamily;
grammar ConfFile {
token TOP {
:my $*linenum = 0;
^ * [$ || (\N*) { die "Parse failed at $0" } ]
}
token fullline {
{ ++$*linenum }
[ \n || { die "Parse failed at line $*linenum" } ]
}
proto token line() {*}
token line:misc { {} (\S+) { die "Unrecognized word: $0" } }
token line:sym { ^^ [ ';' | '#' ] \N* }
token line:sym { ^^ \h* $$ }
token line:sym {:i fullname» { $fullname = $.trim } }
token line:sym {:i favouritefruit» { $favouritefruit = $.trim } }
token line:sym {:i needspeeling» { $needspeeling = defined $ } }
token rest { \h* '='? (\N*) }
token yes { :i \h* '='? \h*
[
|| ([yes|true|1])
|| [no|false|0]
|| (>)
] \h*
}
}
grammar MyConfFile is ConfFile {
token line:sym {:i otherfamily» { @otherfamily = $.split(',')».trim } }
}
MyConfFile.parsefile('file.cfg');
say "fullname: $fullname";
say "favouritefruit: $favouritefruit";
say "needspeeling: $needspeeling";
say "seedsremoved: $seedsremoved";
print "otherfamily: "; say @otherfamily.raku;
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