33 lines
804 B
Gleam
33 lines
804 B
Gleam
import gleam/dynamic/decode.{type Decoder}
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import gleam/json.{type Json}
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import gleam/string
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pub opaque type MarketSymbol {
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MarketSymbol(String)
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}
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pub const min_length: Int = 1
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pub fn parse(value: String) -> Result(MarketSymbol, Nil) {
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case string.length(value) >= min_length {
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True -> Ok(MarketSymbol(value))
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False -> Error(Nil)
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}
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}
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pub fn decoder() -> Decoder(MarketSymbol) {
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use value <- decode.then(decode.string)
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case parse(value) {
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Ok(market_symbol) -> decode.success(market_symbol)
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Error(Nil) -> decode.failure(MarketSymbol("invalid"), "MarketSymbol")
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}
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}
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pub fn to_string(market_symbol: MarketSymbol) -> String {
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let MarketSymbol(symbol) = market_symbol
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symbol
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}
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pub fn encode(market_symbol: MarketSymbol) -> Json {
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json.string(to_string(market_symbol))
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}
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