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|
#
#
# convert Array-like string into Ruby's Array.
class ArrayParser
rule
array : '[' contents ']'
{
result = val[1]
}
| '[' ']'
{
result = []
}
contents: ITEM
{
result = val
}
| contents ',' ITEM
{
result.push val[2]
}
---- inner
def parse(str)
str = str.strip
@q = []
until str.empty?
case str
when /\A\s+/
str = $'
when /\A\w+/
@q.push [:ITEM, $&]
str = $'
else
c = str[0,1]
@q.push [c, c]
str = str[1..-1]
end
end
@q.push [false, '$'] # is optional from Racc 1.3.7
do_parse
end
def next_token
@q.shift
end
---- footer
if $0 == __FILE__
src = <<EOS
[
a, b, c,
d,
e ]
EOS
puts 'parsing:'
print src
puts
puts 'result:'
p ArrayParser.new.parse(src)
end
|
