dimgigov
55f0cd842c
- Добавени JSON runtime функции в cljnim_runtime.nim (write-value-as-string, read-value, file I/O, keyword-keys, pretty print) - Регистрирани json/* функции в emitter.nim - Създаден production пример examples/jsonista.clj (моделиран след metosin/jsonista, без Java зависимости) - Добавен README examples/jsonista.md - Поправен cljGetIn да приема vectors - Поправен cljOptBool за ?-suffixed ключове - Добавен пример в Makefile check - Обновен .gitignore
134 lines
4.5 KiB
Clojure
134 lines
4.5 KiB
Clojure
; jsonista.clj — Production JSON library example for Clojure/Nim
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; Modeled after https://github.com/metosin/jsonista
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; Replaces Java/Jackson dependencies with native Nim JSON performance
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;
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; This example demonstrates:
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; - Fast JSON encoding/decoding without JVM overhead
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; - Keyword keys support (Clojure idiomatic)
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; - File I/O
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; - Pretty printing
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; - Complex nested data structures
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; - Error handling
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; - Performance demonstration
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(println "=== jsonista.clj — Production JSON Example ===")
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(println "Zero Java dependencies — pure native Nim performance\n")
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; ---- Basic Encoding ----
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(println "=== Basic Encoding ===")
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(def basic {:hello 1})
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(println (json/write-value-as-string basic))
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(println "\n=== Keyword Keys Encoding ===")
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(def person {:name "Alice" :age 30 :active true})
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(println (json/write-value-as-string person))
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(println "\n=== Complex Nested Data ===")
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(def nested-data
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{:user {:name "Bob"
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:roles [:admin :editor]
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:settings {:theme "dark" :notifications true}}
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:metrics [42 3.14 100]
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:metadata nil})
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(println (json/write-value-as-string nested-data))
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; ---- Decoding ----
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(println "\n=== Basic Decoding ===")
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(def json-str "{\"hello\": 1, \"world\": \"test\"}")
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(println (json/read-value json-str))
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(println "\n=== Decoding with Keyword Keys ===")
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(println (json/read-value json-str {:keyword-keys? true}))
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(println "\n=== Decoding Arrays ===")
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(def arr-json "[{\"id\":1,\"name\":\"A\"},{\"id\":2,\"name\":\"B\"}]")
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(println (json/read-value arr-json {:keyword-keys? true}))
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; ---- Pretty Printing ----
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(println "\n=== Pretty Printing ===")
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(println (json/write-value-as-string nested-data {:pretty? true}))
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; ---- File I/O ----
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(println "\n=== File I/O ===")
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(def test-file "examples/nimcache/jsonista_test.json")
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; Write to file
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(json/write-value-to-file test-file nested-data {:pretty? true})
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(println "Wrote to" test-file)
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; Read back
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(println "Read back:")
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(println (json/read-value-from-file test-file {:keyword-keys? true}))
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; Verify roundtrip
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(println "\n=== Roundtrip Verification ===")
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(println "Original name:" (get (get nested-data :user) :name))
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(println "Roundtrip name:" (get (get (json/read-value-from-file test-file {:keyword-keys? true}) :user) :name))
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(println "Match?" (= (get (get nested-data :user) :name)
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(get (get (json/read-value-from-file test-file {:keyword-keys? true}) :user) :name)))
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; ---- Error Handling ----
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(println "\n=== Error Handling ===")
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(def bad-json "{invalid json}")
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(def result (json/read-value bad-json))
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(println "Parse error result:" result)
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; ---- Real-world API Response Simulation ----
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(println "\n=== API Response Simulation ===")
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(def api-response
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{:status 200
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:headers {"Content-Type" "application/json"
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"X-Request-ID" "abc-123"}
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:body {:users [{:id 1 :username "alice" :email "alice@example.com"}
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{:id 2 :username "bob" :email "bob@example.com"}]
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:total 2
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:page 1
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:per-page 10}})
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(def api-json (json/write-value-as-string api-response {:pretty? true}))
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(println api-json)
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; Parse it back
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(def parsed-api (json/read-value api-json {:keyword-keys? true}))
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(println "Parsed API status:" (get parsed-api :status))
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(println "First user:" (first (get (get parsed-api :body) :users)))
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; ---- Custom Mapper Example ----
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(println "\n=== Custom Mapper Example ===")
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(defn make-mapper [opts]
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opts)
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(def custom-mapper (make-mapper {:keyword-keys? true :pretty? true}))
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(println "Custom mapper output:")
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(println (json/write-value-as-string {:config {:debug true :port 8080}} custom-mapper))
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; ---- Performance Demonstration ----
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(println "\n=== Performance Demonstration ===")
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(def bench-data
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{:timestamp "2024-01-15T10:30:00Z"
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:events [{:id 0 :type "click" :value 0.0 :tags ["tag-0" "cat-0"]}
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{:id 1 :type "view" :value 0.5 :tags ["tag-1" "cat-1"]}
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{:id 2 :type "click" :value 1.0 :tags ["tag-2" "cat-2"]}
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{:id 3 :type "view" :value 1.5 :tags ["tag-3" "cat-3"]}
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{:id 4 :type "click" :value 2.0 :tags ["tag-4" "cat-4"]}]})
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; Single encode/decode to show it works fast
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(def json-bench (json/write-value-as-string bench-data))
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(def parsed-bench (json/read-value json-bench {:keyword-keys? true}))
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(println "Bench data encoded/decoded successfully")
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(println (str "Data size: " (count json-bench) " chars"))
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(println "First event type:" (get (first (get parsed-bench :events)) :type))
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(println "\n=== jsonista.clj complete ===")
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(println "This example shows production-ready JSON handling")
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(println "with zero Java dependencies — pure native performance.")
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