openinfer-dsl 0.1.0

Rust-embedded DSL for defining OpenInfer graphs with explicit control flow and memory semantics.
Documentation 
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use syn::parse::{ParseStream, Result};
use syn::{parenthesized, LitBool, LitInt, Token};

use crate::types::InitValue;

pub fn parse_init_value(input: ParseStream) -> Result<InitValue> {
    let content;
    parenthesized!(content in input);
    let negative = if content.peek(Token![-]) {
        content.parse::<Token![-]>()?;
        true
    } else {
        false
    };
    if content.peek(syn::LitFloat) {
        let lit: syn::LitFloat = content.parse()?;
        Ok(InitValue::Float { lit, negative })
    } else if content.peek(LitInt) {
        let lit: LitInt = content.parse()?;
        Ok(InitValue::Int { lit, negative })
    } else if content.peek(LitBool) {
        if negative {
            return Err(content.error("boolean init cannot be negative"));
        }
        let lit: LitBool = content.parse()?;
        Ok(InitValue::Bool { lit })
    } else {
        Err(content.error("expected numeric or boolean literal for init"))
    }
}