odin_validate {odin}

Validate an odin model

Description

Validate an odin model. This function is closer to odin_parse_ than odin_parse because it does not do any quoting of the code. It is primarily intended for use within other applications.

Usage

odin_validate(x, type = NULL, options = NULL)

Arguments

x

An expression, character vector or filename with the odin code

type

An optional string indicating the the type of input - must be one of expression, file or text if provided. This skips the type detection code used by odin and makes validating user input easier.

options

odin options; see odin_options. The primary options that affect the parse stage are validate and pretty.

Details

odin_validate will always return a list with the same elements:

success

A boolean, TRUE if validation was successful

result

The intermediate representation, as returned by odin_parse_, if the validation was successful, otherwise NULL

error

An error object if the validation was unsuccessful, otherwise NULL. This may be a classed odin error, in which case it will contain source location information - see the examples for details.

messages

A list of messages, if the validation returned any. At present this is only non-fatal information about unused variables.

Author(s)

Rich FitzJohn

Examples

# A successful validation:
odin::odin_validate(c("deriv(x) <- 1", "initial(x) <- 1"))

# A complete failure:
odin::odin_validate("")

# A more interesting failure
code <- c("deriv(x) <- a", "initial(x) <- 1")
res <- odin::odin_validate(code)
res

# The object 'res$error' is an 'odin_error' object:
res$error

# It contains information that might be used to display to a
# user information about the error:
unclass(res$error)

# Notes are raised in a similar way:
code <- c("deriv(x) <- 1", "initial(x) <- 1", "a <- 1")
res <- odin::odin_validate(code)
res$messages[[1]]