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+ A few ways of making parlset parsers modular.
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$:.unshift File.dirname(__FILE__) + "/../lib" | ||
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require 'pp' | ||
require "parslet" | ||
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# Demonstrates modular parsers, split out over many classes. Please look at | ||
# ip_address.rb as well. | ||
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module ALanguage | ||
include Parslet | ||
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# Parslet rules are really a special kind of method. Mix them into your | ||
# classes! | ||
rule(:a_language) { str('aaa') } | ||
end | ||
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# Parslet parsers are parslet atoms as well. Create an instance and chain them | ||
# to your other rules. | ||
# | ||
class BLanguage < Parslet::Parser | ||
root :blang | ||
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rule(:blang) { str('bbb') } | ||
end | ||
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# Parslet atoms are really Ruby values, pass them around. | ||
c_language = Parslet.str('ccc') | ||
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class Language < Parslet::Parser | ||
def initialize(c_language) | ||
@c_language = c_language | ||
super() | ||
end | ||
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root :root | ||
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include ALanguage | ||
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rule(:root) { str('a(') >> a_language >> str(')') >> space | | ||
str('b(') >> BLanguage.new >> str(')') >> space | | ||
str('c(') >> @c_language >> str(')') >> space } | ||
rule(:space) { str(' ').maybe } | ||
end | ||
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Language.new(c_language).parse('a(aaa)') | ||
Language.new(c_language).parse('b(bbb)') | ||
Language.new(c_language).parse('c(ccc)') |
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