▼ |  | Dr Racket Plugins

1 | Implementing Dr Racket Plugins
2 | Adding Languages to Dr Racket
3 | Creating New Kinds of Dr Racket Frames
4 | Extending the Existing Dr Racket Classes
5 | Expanding the User’s Program Text and Breaking
6 | Editor Modes
7 | Language-specific capabilities
8 | Check Syntax
9 | Teaching Languages
10 | drracket: get/ extend
11 | drracket: unit
12 | drracket: language
13 | drracket: language-configuration
14 | drracket: debug
15 | drracket: rep
16 | drracket: frame
17 | drracket: help-desk
18 | drracket: eval
19 | drracket: modes
20 | drracket: module-language-tools
21 | drracket: module-language
22 | Documentation Utilities
23 | Backwards compatibility
| Index

On this page:

drracket: modes: add-mode
drracket: modes: mode?
drracket: modes: get-modes
drracket: modes: mode-name
drracket: modes: mode-surrogate
drracket: modes: mode-repl-submit
drracket: modes: mode-matches-language

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### 19`` drracket:modes

> > procedure
> > (drracket:modes:add-mode |  | name |
> > |  | surrogate |
> > |  | repl-submit |
> > |  | matches-language) |
> → drracket:modes:mode?
> name : string?
> surrogate : (or/c false/c (is-a?/c mode:surrogate-text<%>))
> repl-submit : ((is-a?/c drracket:rep:text%) number? . -> . boolean?)
> matches-language : ((or/c false/c (listof string?)) . -> . boolean?)

Adds a mode to DrRacket. Returns a mode value that identifies the mode.

The first argument, name, is the name of the mode, used in DrRacket’s GUI to allow the user to select this mode.

The surrogate argument is set to the definitions text and the interactions text (via the mode:host-text set-surrogate<%> method) whenever this mode is enabled.

The repl-submit procedure is called whenever the user types a return in the interactions window. It is passed the interactions editor and the position where the last prompt occurs. If it returns #t, the text after the last prompt is treated as a program fragment and evaluated, according to the language settings. If it returns #f, the text is assumed to be an incomplete program fragment, and the keystroke is not treated specially.

The matches-language predicate is called whenever the language changes. If it returns #t this mode is installed. It is passed the list of strings that correspond to the names of the language in the language dialog.

Modes are tested in the opposite order that they are added. That is, the last mode to be added gets tested first when the filename changes or when the language changes.

See also drracket:modes:get-modes.

> procedure (drracket:modes:mode? val) → boolean?
> val : any/c

Determines if val is a mode.

> procedure (drracket:modes:get-modes) → (listof drracket:modes:mode?)

Returns all of the modes currently added to DrRacket.

See also drracket:modes:add-mode.

> procedure (drracket:modes:mode-name mode) → string?
> mode : drracket:modes:mode?

Extracts the name of the mode.

See also drracket:modes:add-mode.

> procedure (drracket:modes:mode-surrogate mode)
> → (or/c false/c (is-a?/c mode:surrogate-text<%>))
> mode : drracket:modes:mode?

Extracts the surrogate of the mode.

See also drracket:modes:add-mode.

> procedure (drracket:modes:mode-repl-submit mode) → any
> mode : drracket:modes:mode?

Extracts the repl submission predicate of the mode.

See also drracket:modes:add-mode.

> procedure (drracket:modes:mode-matches-language mode)
> → ((or/c false/c (listof string?)) . -> . boolean?)
> mode : drracket:modes:mode?

Extracts the language matching predicate of the mode.

See also drracket:modes:add-mode.

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