90 lines
2.5 KiB
Ruby
90 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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module Rpl
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module Lang
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class Parser
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def initialize; end
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def numeric?( elt )
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!Float(elt).nil?
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rescue ArgumentError
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begin
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!Integer(elt).nil?
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rescue ArgumentError
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false
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end
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end
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def parse_input( input )
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splitted_input = input.split(' ')
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# 2-passes:
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# 1. regroup strings and programs
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opened_programs = 0
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closed_programs = 0
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string_delimiters = 0
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regrouping = false
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regrouped_input = []
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splitted_input.each do |elt|
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# TODO: handle buried-in-elt « and » (surround by ' ' and re-split)
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if elt[0] == '«'
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opened_programs += 1
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elt.gsub!( '«', '« ') if elt.length > 1 && elt[1] != ' '
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end
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string_delimiters += 1 if elt[0] == '"'
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elt = "#{regrouped_input.pop} #{elt}".strip if regrouping
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regrouped_input << elt
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if elt[-1] == '»'
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closed_programs += 1
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elt.gsub!( '»', ' »') if elt.length > 1 && elt[-2] != ' '
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end
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string_delimiters += 1 if elt.length > 1 && elt[-1] == '"'
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regrouping = string_delimiters.odd? || (opened_programs > closed_programs )
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end
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# 2. parse
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parsed_tree = []
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regrouped_input.each do |elt|
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parsed_entry = { value: elt }
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opened_programs += 1 if elt[0] == '«'
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string_delimiters += 1 if elt[0] == '"'
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parsed_entry[:type] = case elt[0]
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when '«'
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:program
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when '"'
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:string
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when "'"
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:name # TODO: check for forbidden space
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else
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if numeric?( elt )
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:numeric
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else
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:word
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end
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end
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if parsed_entry[:type] == :numeric
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parsed_entry[:base] = 10 # TODO: parse others possible bases 0x...
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begin
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parsed_entry[:value] = Float( parsed_entry[:value] )
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rescue ArgumentError
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parsed_entry[:value] = Integer( parsed_entry[:value] )
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end
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end
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parsed_tree << parsed_entry
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end
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parsed_tree
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end
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end
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end
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end
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