The TL Script Editor (TLScriptCodeEditorControl) already offers code completion: When you type `, model elements are suggested; when you type ., functions are suggested.

Extension: When you type ` $, the variables available at the cursor position within the scope should be suggested.

Behavior

• Typing $ opens the completion popup with the variables available in the current scope; typing further filters the list.
• Only variables whose scope includes the cursor are suggested:
  • Lambda parameters (x -> ...) are only visible within the lambda body. The body ends at `,`, `;`, or the closing parenthesis.
  • Local assignments (name = ...;) are visible in the following statements of the same block (block-local), but not within their own right-hand side.
• No suggestions:
  • at the top level without an enclosing lambda or a preceding assignment,
  • inside string literals ("...", '...'),
  • within model constants (` `... ``).

Examples

count(all(`MyModule:MyType`), x -> $   )   // provides $x
                            .filter(y -> $ )   // provides $x and $y
$                                              // top level: nothing

fun = x -> $x + 1; $                           // returns $fun (not $x)
a = 5; b = 3; $                                // returns $a and $b

Implementation

• New scope analyzer TLScriptVariableScope: tokenizes the text up to the cursor using the TL-Script lexer and determines the visible variables via a stack of bracket frames (lambda parameters per statement/argument, local assignments per block). Robust against incomplete input while typing.
• TLScriptAutoCompletionCommand: new variable completion mode; reads the new command argument textToCursor. Mode order ensures that $ in strings/model constants does not trigger completion.
• TLScriptCodeEditorControl: Trigger regex extended to include a $ branch.
• Client (mode-tlscript.js): additionally sends the text up to the cursor position (textToCursor).

Affected module: com.top_logic.model.search.