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# coding: utf-8
# grammar from
# http://www.json.org/
require "rsec"
class SlowJSON
include Rsec::Helper
def initialize
generate_parser
@parser = seq(/\s*/, @value, /\s*/)[1].eof
end
def parse s
@parser.parse! s
end
private
# term (, term)*
def elem_parser term
term.join(/\s*,\s*/.r).even
end
def chars_parser
unicode_bytes = /[0-9a-f]{4}/i.r{|bytes|
[bytes].pack('H*').force_encoding('utf-16be').encode!('utf-8')
}
escape_char = '"'.r | "\\" | '/' |
'b'.r{"\b"} |
'f'.r{"\f"} |
'n'.r{"\n"} |
'r'.r{"\r"} |
't'.r{"\t"} |
seq('u'.r, unicode_bytes)[1]
/[^"\\]+/.r | seq('\\', escape_char)[1]
end
def generate_parser
string = '"'.r >> chars_parser.star.map(&:join) << '"'
# -? int frac? exp?
number = prim(:double, allowed_sign: '-')
@value = string | number | lazy{@object} | lazy{@array} |
'true'.r{true} |
'false'.r{false} |
'null'.r{nil}
pair = seq(string, /\s*:\s*/.r, @value){|k, _, v| [k, v]}
@array = /\[\s*\]/.r{[]} | '['.r >> elem_parser(@value) << ']'
@object = /\{\s*\}/.r{{}} | ('{'.r >> elem_parser(pair) << '}').map{|arr|Hash[arr]}
end
end
if __FILE__ == $PROGRAM_NAME
j = SlowJSON.new
p j.parse '""'
p j.parse '123.4e5'
p j.parse 'null'
p j.parse '[]'
p j.parse '{}'
p j.parse '{"no": [3, 4]}'
p j.parse '[{}]'
p j.parse '[{"S":321061,"T":"GetAttributeResp"},{"ERROR":null,"TS":0,"VAL":{"SqlList":[{"BatchSizeMax":0,"BatchSizeTotal":0,"ConcurrentMax":1,"DataSource":"jdbc:wrap-jdbc:filters=default,encoding:name=ds-offer:jdbc:mysql://100.10.10.10:8066/xxxx","EffectedRowCount":0,"ErrorCount":0,"ExecuteCount":5,"FetchRowCount":5,"File":null,"ID":2001,"LastError":null,"LastTime":1292742908178,"MaxTimespan":16,"MaxTimespanOccurTime":1292742668191,"Name":null,"RunningCount":0,"SQL":"SELECT @@SQL_MODE","TotalTime":83}]}}]'
end
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