protoflow-blocks 0.4.3

Protoflow implements flow-based programming (FBP) for Rust using Protocol Buffers messages.
Documentation 
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// This is free and unencumbered software released into the public domain.

use super::prelude::{Box, Cow, Named, String, Vec};
use crate::{
    BlockConnections, BlockInstantiation, CoreBlockConfig, FlowBlockConfig, HashBlockConfig,
    IoBlockConfig, MathBlockConfig, SysBlockConfig, System, TextBlockConfig,
};
use protoflow_core::Block;

pub type InputPortName = String;
pub type OutputPortName = String;

#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[cfg_attr(feature = "serde", serde(untagged))]
#[derive(Clone, Debug)]
pub enum BlockConfig {
    Core(CoreBlockConfig),
    Flow(FlowBlockConfig),
    #[cfg(feature = "hash")]
    Hash(HashBlockConfig),
    Io(IoBlockConfig),
    Math(MathBlockConfig),
    #[cfg(feature = "std")]
    Sys(SysBlockConfig),
    Text(TextBlockConfig),
}

#[cfg(feature = "serde")]
impl<'de> serde::Deserialize<'de> for BlockConfig {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        use serde_yml::{value::TaggedValue, Value};
        let value = TaggedValue::deserialize(deserializer)?;
        match &value {
            TaggedValue {
                tag,
                value: Value::Mapping(_mapping),
            } => Ok(match tag.string.as_str() {
                "Buffer" | "Const" | "Count" | "Delay" | "Drop" | "Random" => {
                    CoreBlockConfig::deserialize(value.clone())
                        .map(BlockConfig::Core)
                        .unwrap()
                }

                #[cfg(feature = "hash")]
                "Hash" => HashBlockConfig::deserialize(value.clone())
                    .map(BlockConfig::Hash)
                    .unwrap(),

                "Decode" | "Encode" | "EncodeHex" | "EncodeJSON" => {
                    IoBlockConfig::deserialize(value.clone())
                        .map(BlockConfig::Io)
                        .unwrap()
                }

                #[cfg(feature = "std")]
                "ReadDir" | "ReadEnv" | "ReadFile" | "ReadStdin" | "WriteFile" | "WriteStderr"
                | "WriteStdout" => SysBlockConfig::deserialize(value.clone())
                    .map(BlockConfig::Sys)
                    .unwrap(),

                _ => return Err(serde::de::Error::custom("unknown Protoflow block type")),
            }),

            _ => {
                return Err(serde::de::Error::custom(
                    "unexpected YAML element, expected a tagged mapping",
                ))
            }
        }
    }
}

impl Named for BlockConfig {
    fn name(&self) -> Cow<str> {
        use BlockConfig::*;
        match self {
            Core(config) => config.name(),
            Flow(config) => config.name(),
            #[cfg(feature = "hash")]
            Hash(config) => config.name(),
            Io(config) => config.name(),
            Math(config) => config.name(),
            #[cfg(feature = "std")]
            Sys(config) => config.name(),
            Text(config) => config.name(),
        }
    }
}

impl BlockConnections for BlockConfig {
    fn output_connections(&self) -> Vec<(&'static str, Option<OutputPortName>)> {
        use BlockConfig::*;
        match self {
            Core(config) => config.output_connections(),
            Flow(config) => config.output_connections(),
            #[cfg(feature = "hash")]
            Hash(config) => config.output_connections(),
            Io(config) => config.output_connections(),
            Math(config) => config.output_connections(),
            #[cfg(feature = "std")]
            Sys(config) => config.output_connections(),
            Text(config) => config.output_connections(),
        }
    }
}

impl BlockInstantiation for BlockConfig {
    fn instantiate(&self, system: &mut System) -> Box<dyn Block> {
        use BlockConfig::*;
        match self {
            Core(config) => config.instantiate(system),
            Flow(config) => config.instantiate(system),
            #[cfg(feature = "hash")]
            Hash(config) => config.instantiate(system),
            Io(config) => config.instantiate(system),
            Math(config) => config.instantiate(system),
            #[cfg(feature = "std")]
            Sys(config) => config.instantiate(system),
            Text(config) => config.instantiate(system),
        }
    }
}