Sys structure

Up to index

The Sys structure provides functions for interacting with the Morel execution environment, such as reading properties and managing the environment.

Synopsis

val clearEnv : unit -> unit
val colorSchemes : unit -> {comment: string, constant: string, error: string, identifier: string, keyword: string, name: string, numeric: string, string: string, symbol: string, typeVar: string} list
val deduceColorScheme : unit -> string
val env : unit -> (string * string) list
val file : {}
val parseTree : string -> string
val plan : unit -> string
val planEx : string -> string
val set : string * 'a -> unit
val show : string -> string option
val showAll : unit -> (string * string option) list
val unset : string -> unit

clearEnv

clearEnv () restores the environment to the initial environment.

colorSchemes

colorSchemes () returns the built-in syntax-highlighting color schemes. Each scheme is a record whose name field is the scheme name and whose remaining fields give the style of each token category.

deduceColorScheme

deduceColorScheme () returns the name of the color scheme in effect for syntax highlighting: the colorScheme property if it names a built-in scheme, otherwise the scheme deduced from the terminal's background.

env

env () prints the environment.

file

file is a view of the file system as a record. The fields of the record depend on the files and directories under the configured directory.

parseTree

parseTree s parses s as a top-level Morel statement and returns a parenthesized S-expression-style dump of the resulting abstract syntax tree. Useful for testing parser behavior (e.g. operator precedence and attribute attachment) from .smli scripts. Raises Error if the string does not parse.

plan

plan () prints the plan of the most recently executed expression.

planEx

planEx phase re-plans the most recently executed expression and returns the Core representation at the specified phase. The phase argument can be "0" (initial), "-1" (final), or a specific pass number.

set

set (property, value) sets the value of property to value. (See Properties below.)

show

show property returns the current the value of property, as a string, or NONE if unset.

showAll

showAll () returns a list of all properties and their current value as a string, or NONE if unset.

unset

unset property clears the current the value of property.