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Contents
module CEML
grammar Lexer
rule text
(!eol .)+
end
rule nl
(ws? comment? eol)+
end
rule ws
[ \t\f]+
end
rule comment
'//' text
end
rule eol
("\r" "\n"?) / "\n"
end
rule number
([1-9]+ [0-9]* / '0' / 'an' / 'a' / 'the') {
def value
case text_value
when 'a', 'an', 'the' then 1
else text_value.to_i
end
end
}
end
rule and
(ws? ',')? ws 'and' ws / ws? ',' ws?
end
rule reserved_word
'and' / 'within'
end
rule id
!(reserved_word ws) [a-zA-Z_]+
end
rule distance
number ws? distance_unit:('miles' / 'mile' / 'mi' / 'km' / 'kilometers' / 'k' / 'meters' / 'm' / 'ft' / 'feet' / 'f' / 'blocks' / 'block')
{
def meters
number.text_value.to_f * case distance_unit.text_value
when /^mi/; 1600; when /^k/; 1000; when /^m/; 1;
when /^f/; 0.35; when /^b/; 200; else 1; end
end
}
end
rule range
min:number max:('+' / '-' number)?
{
def min
super.value
end
def max
return min if super.empty?
return 10000 if super.text_value == '+'
return super.number.text_value.to_i
end
}
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems