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ebot/parse_complex_json.exs

Last active October 7, 2015 03:34
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Example that compares parsing a complex json object in go and in elixir
Raw
parse_complex_json.exs
# { "DocVersions": {
# "1": {
# "version_date": "2015-10-06 12:00:00",
# "objects": [
# { "LogicalObjNum":1,
# "PhysicalObjNum":1,
# "FileExtension":"TIF",
# "FileFmtDesc":"TIFF Images (Black and White)"}
# ]
# }
# },
# "DocLabels":[ {"label":"ed"}, {"label":"Ann"}]
# }
json_string = "{ \"DocVersions\": { \"1\": { \"version_date\": \"2015-10-06 12:00:00\", \"objects\":[ { \"LogicalObjNum\":1, \"PhysicalObjNum\":1, \"FileExtension\":\"TIF\", \"FileFmtDesc\":\"TIFF Images (Black and White)\"} ] } }, \"DocLabels\":[{\"label\":\"Ed\"},{\"label\": \"Ann\"}]}"
meta = Poison.Parser.parse!(json_string)
[first_label | _] = Map.get meta, "DocLabels"
versions = Map.get meta, "DocVersions"
IO.puts "Label One: #{first_label["label"]}"
IO.puts "Versions:"
print_object = fn(o) ->
Enum.map(o, fn {k, v} -> IO.puts " #{k}: #{v}" end)
end
print_version = fn {k, v} ->
IO.puts " Version: #{k}"
IO.puts " Date: #{v["version_date"]}"
IO.puts " Objects:"
Enum.map(v["objects"], fn obj -> print_object.(obj) end)
end
Enum.map(versions, print_version)
Raw
parse_complex_json.go
package main
import (
"encoding/json"
"fmt"
)
func main() {
/*
{ "DocVersions": {
"1": {
"version_date": "2015-10-06 12:00:00",
"objects":
[{ "LogicalObjNum":1,
"PhysicalObjNum":1,
"FileExtension":"TIF",
"FileFmtDesc":"TIFF Images (Black and White)"}
]
}
},
"DocLabels":[{"label":"Ed"}, {"label":"Ann"}]
}
*/
type Meta struct {
DocVersions map[string]struct {
Date string `json:"version_date"`
Objects []struct {
LogicalObjNum int
PhysicalObjNum int
FileExtension string
FileFmtDesc string
} `json:"objects"`
}
DocLabels []struct {
Value string `json:"label"`
}
}
var meta Meta
jsonString := "{ \"DocVersions\": { \"1\": { \"version_date\": \"2015-10-06 12:00:00\", \"objects\":[ { \"LogicalObjNum\":1, \"PhysicalObjNum\":1, \"FileExtension\":\"TIF\", \"FileFmtDesc\":\"TIFF Images (Black and White)\"} ] } }, \"DocLabels\":[{\"label\":\"Ed\"},{\"label\": \"Ann\"}]}"
jsonByteArray := []byte(jsonString)
json.Unmarshal(jsonByteArray, &meta)
fmt.Println("Label One:", meta.DocLabels[0].Value)
fmt.Println("Versions:")
for versionNum, version := range meta.DocVersions {
fmt.Printf(" Version: %v %s\n", versionNum, version.Date)
fmt.Println(" Objects: ")
for _, object := range version.Objects {
fmt.Printf(" Object %d, Page %d: %s - %s\n",
object.PhysicalObjNum, object.LogicalObjNum, object.FileExtension, object.FileFmtDesc)
}
}
}
Raw
parse_complex_json.rb
require 'json'
# { "DocVersions": {
# "1": {
# "version_date": "2015-10-06 12:00:00",
# "objects": [
# { "LogicalObjNum":1,
# "PhysicalObjNum":1,
# "FileExtension":"TIF",
# "FileFmtDesc":"TIFF Images (Black and White)"}
# ]
# }
# },
# "DocLabels":[ {"label":"ed"}, {"label":"Ann"}]
# }
json_string = "{ \"DocVersions\": { \"1\": { \"version_date\": \"2015-10-06 12:00:00\", \"objects\":[ { \"LogicalObjNum\":1, \"PhysicalObjNum\":1, \"FileExtension\":\"TIF\", \"FileFmtDesc\":\"TIFF Images (Black and White)\"} ] } }, \"DocLabels\":[{\"label\":\"Ed\"},{\"label\": \"Ann\"}]}"
doc_meta = JSON.parse json_string
puts " Document Labels:"
doc_meta['DocLabels'].each do |l|
l.each { |lk, lv| puts " #{lv}" }
end
puts " Document Versions:"
doc_meta['DocVersions'].each do |k,v|
puts " Version #{k} (#{v["version_date"]}):"
v["objects"].each do |object|
object.each { |ok, ov| puts " #{ok} => #{ov}" }
puts '----------------------------------------------------------'
end
end
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