rquickjs 0.0.1

High level bindings to the quickjs javascript engine
Documentation 
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use crate::{context::Ctx, Array, Error, Object, Result, String, Value};
use std::string::String as StdString;

/// For converting javascript values to rust values
pub trait FromJs<'js>: Sized {
    fn from_js(ctx: Ctx<'js>, value: Value<'js>) -> Result<Self>;
}

impl<'js> FromJs<'js> for Value<'js> {
    fn from_js(_: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        Ok(value)
    }
}

impl<'js> FromJs<'js> for StdString {
    fn from_js(ctx: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        let type_name = value.type_name();
        let res = ctx
            .coerce_string(value)
            .map_err(|e| {
                if let Error::Exception(text) = e {
                    Error::FromJsConversion {
                        from: type_name,
                        to: "string",
                        message: Some(text),
                    }
                } else {
                    e
                }
            })?
            .to_str()?
            .to_string();
        Ok(res)
    }
}

impl<'js> FromJs<'js> for i32 {
    fn from_js(ctx: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        let type_name = value.type_name();
        ctx.coerce_i32(value).map_err(|e| {
            if let Error::Exception(text) = e {
                Error::FromJsConversion {
                    from: type_name,
                    to: "i32",
                    message: Some(text),
                }
            } else {
                e
            }
        })
    }
}

impl<'js> FromJs<'js> for u64 {
    fn from_js(ctx: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        let type_name = value.type_name();
        ctx.coerce_u64(value).map_err(|e| {
            if let Error::Exception(text) = e {
                Error::FromJsConversion {
                    from: type_name,
                    to: "u32",
                    message: Some(text),
                }
            } else {
                e
            }
        })
    }
}

impl<'js> FromJs<'js> for f64 {
    fn from_js(ctx: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        let type_name = value.type_name();
        ctx.coerce_f64(value).map_err(|e| {
            if let Error::Exception(text) = e {
                Error::FromJsConversion {
                    from: type_name,
                    to: "f64",
                    message: Some(text),
                }
            } else {
                e
            }
        })
    }
}

impl<'js> FromJs<'js> for bool {
    fn from_js(ctx: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        let type_name = value.type_name();
        ctx.coerce_bool(value).map_err(|e| {
            if let Error::Exception(text) = e {
                Error::FromJsConversion {
                    from: type_name,
                    to: "bool",
                    message: Some(text),
                }
            } else {
                e
            }
        })
    }
}

impl<'js> FromJs<'js> for String<'js> {
    fn from_js(_: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        match value {
            Value::String(x) => Ok(x),
            x => {
                return Err(Error::FromJsConversion {
                    from: x.type_name(),
                    to: "string",
                    message: None,
                })
            }
        }
    }
}

impl<'js> FromJs<'js> for Object<'js> {
    fn from_js(_: Ctx<'js>, value: Value<'js>) -> Result<Self> {
        match value {
            Value::Object(x) => Ok(x),
            x => {
                return Err(Error::FromJsConversion {
                    from: x.type_name(),
                    to: "object",
                    message: None,
                })
            }
        }
    }
}

impl<'js> FromJs<'js> for () {
    fn from_js(_: Ctx<'js>, _: Value<'js>) -> Result<Self> {
        Ok(())
    }
}

/// For converting rust values to javascript values
pub trait ToJs<'js> {
    fn to_js(self, ctx: Ctx<'js>) -> Result<Value<'js>>;
}

impl<'js> ToJs<'js> for Value<'js> {
    fn to_js(self, _: Ctx<'js>) -> Result<Value<'js>> {
        Ok(self)
    }
}

impl<'js> ToJs<'js> for String<'js> {
    fn to_js(self, _: Ctx<'js>) -> Result<Value<'js>> {
        Ok(Value::String(self))
    }
}

impl<'js> ToJs<'js> for Object<'js> {
    fn to_js(self, _: Ctx<'js>) -> Result<Value<'js>> {
        Ok(Value::Object(self))
    }
}

impl<'js> ToJs<'js> for Array<'js> {
    fn to_js(self, _: Ctx<'js>) -> Result<Value<'js>> {
        Ok(Value::Array(self))
    }
}

impl<'js> ToJs<'js> for StdString {
    fn to_js(self, ctx: Ctx<'js>) -> Result<Value<'js>> {
        let s = String::from_str(ctx, self.as_str())?;
        Ok(Value::String(s))
    }
}

impl<'js, 'a> ToJs<'js> for &'a str {
    fn to_js(self, ctx: Ctx<'js>) -> Result<Value<'js>> {
        let s = String::from_str(ctx, self)?;
        Ok(Value::String(s))
    }
}

impl<'js> ToJs<'js> for i32 {
    fn to_js(self, _: Ctx<'js>) -> Result<Value<'js>> {
        Ok(Value::Int(self))
    }
}