MQL Tools Auto-completion Fails for Struct Members When Using this. Syntax in VS Code Extension

[Arash-Hashemi]

I am experiencing an issue with the IntelliSense auto-completion feature in my Visual Studio Code extension for MetaTrader 5 (MQL5) development.

Problem Description

Auto-completion suggests struct members correctly in the standard case but fails in a specific scenario involving the this keyword.

1. Normal Case (Working):

   • When I type the name of a struct followed by a dot ., the members of that struct are correctly suggested.
   • Example: mystruct. ✅ → Suggestions appear.

2. Problem Case 1 (Not Working):

   • When I use the this keyword (which is a pointer to the current class instance) followed by a dot . and the struct name, auto-completion fails after the second dot.
   • Example: this.mystruct. ❌ → No suggestions appear.

3. Problem Case 2 (Working but Invalid):

   • If I use the pointer operator -> with this (i.e., this->mystruct.), auto-completion does work and suggests the struct members correctly.
   • However, this syntax is invalid in MQL5 and results in compilation errors:
     • '>' - operand expected
     • '-' - illegal operation use

Summary of the Issue

The correct, error-free syntax this.mystruct. does not trigger auto-completion, while the incorrect syntax this->mystruct. does. This forces developers to manually type all member names, reducing productivity and increasing the chance of errors.

Expected Behavior

IntelliSense should provide auto-completion for struct members when using the valid this.mystruct. syntax, just as it does for a plain struct variable.

Request

Could you please investigate why the this. syntax breaks the auto-completion chain and provide a fix so that it works as expected?

Thank you for your time and assistance.

Best regards,