Created
August 6, 2013 23:32
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require "parslet" | |
require "pry" | |
class Parslet::Atoms::Str | |
def to_hash | |
{ | |
"atom" => "str", | |
"str" => str | |
} | |
end | |
end | |
class Parslet::Atoms::Sequence | |
def to_hash | |
{ | |
"atom" => "sequence", | |
"parslets" => parslets.map(&:to_hash) | |
} | |
end | |
end | |
class Parslet::Atoms::Repetition | |
def to_hash | |
{ | |
"atom" => "repetition", | |
"min" => min, | |
"max" => max, | |
"parslet" => parslet.to_hash | |
} | |
end | |
end | |
class Parslet::Atoms::Re | |
def to_hash | |
{ | |
"atom" => "re", | |
"match" => match, | |
"re" => re | |
} | |
end | |
end | |
class Parslet::Atoms::Named | |
def to_hash | |
{ | |
"atom" => "named", | |
"name" => name, | |
"parslet" => parslet.to_hash | |
} | |
end | |
end | |
class Parslet::Atoms::Entity | |
def to_hash | |
{ | |
"atom" => "entity", | |
"name" => name, | |
"parslet" => parslet.to_hash | |
} | |
end | |
end | |
class Parslet::Parser | |
def to_hash | |
{ | |
"atom" => "root", | |
"parslet" => root.to_hash | |
} | |
end | |
def self.from_hash(hash) | |
new.tap do |parser| | |
parser.define_singleton_method(hash["atom"]) do | |
hash["parslet"].to_parslet | |
end | |
end | |
end | |
end | |
class Hash | |
def to_parslet | |
case fetch("atom") | |
when "entity" | |
Parslet::Atoms::Entity.new(fetch("name")).tap do |entity| | |
entity.instance_variable_set("@parslet", fetch("parslet").to_parslet) | |
end | |
when "named" | |
Parslet::Atoms::Named.new(fetch("parslet").to_parslet, fetch("name")) | |
when "repetition" | |
Parslet::Atoms::Repetition.new(fetch("parslet").to_parslet, fetch("min"), fetch("max")) | |
when "sequence" | |
Parslet::Atoms::Sequence.new(*fetch("parslets").map(&:to_parslet)) | |
when "re" | |
Parslet::Atoms::Re.new(fetch("match")).tap do |re| | |
re.instance_variable_set("@re", fetch("re")) | |
end | |
when "str" | |
Parslet::Atoms::Str.new(fetch("str")) | |
end | |
end | |
end | |
class WhiskeyParser < Parslet::Parser | |
root(:command) | |
rule(:space) { match["\s"].repeat } | |
rule(:space?) { space.maybe } | |
rule(:username) { match["a-zA-Z0-9"].repeat } | |
rule(:password) { match["a-zA-Z0-9"].repeat } | |
rule(:arguments) { username.as(:username) >> space? >> password.as(:password) >> space? } | |
rule(:control) { str("account").as(:control) } | |
rule(:action) { str("create").as(:action) } | |
rule(:command) { control >> space >> action >> space >> arguments } | |
end | |
parser = WhiskeyParser.new | |
p hash = parser.to_hash | |
p parslet = Parslet::Parser.from_hash(hash) | |
p parslet.parse("account create krainboltgreene 1234abcd") |
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