Release Notes

v1.7.1

GitHub Release

Bug Fixes

  • Parser — handle dotted type names (e.g. __SYSTEM.IQueryInterface) in parseTypeRef(), eliminating false “Unknown type” warnings for namespace-qualified types

v1.7.0

GitHub Release

Features

  • Signature Help — show all parameter directions (VAR_INPUT, VAR_OUTPUT, VAR_IN_OUT), optional status, return types, and compiled library methods

Bug Fixes

  • Distinguish FUNCTION from FUNCTION_BLOCK in compiled libraries

v1.6.0

GitHub Release

Features

  • Compiled library support — resolve compiled libraries from the TwinCAT installation path, enabling completion, hover, and diagnostics for installed libraries

v1.5.0

GitHub Release

Features

  • Completion — POINTER TO and REFERENCE TO offered as compound keywords in type contexts
  • Completion / Hover — resolve __SYSTEM.* qualified member access for system namespace types

v1.4.0

GitHub Release

Features

  • Library indexing — filter library indexing by .plcproj library references, reducing noise from unused libraries

v1.3.0

GitHub Release

Features

  • Lexer — POINTER and REFERENCE are now proper keywords with syntax highlighting and completion support

v1.2.0

GitHub Release

Features

  • Virtual ST view — virtual structured text view for TcPOU files
  • Completion — member-access dot completion on objects, THIS^/SUPER^ completion with inheritance and visibility filtering, enum-aware completion on := assignment and CASE selector, unqualified local completion for own methods/properties/actions
  • Hover — constant value resolution, var block kind and value range display
  • Diagnostics — semantic type diagnostics, BOOL-to-numeric mismatch detection, warning-level undefined identifier errors
  • Code Actions — QuickFix suggestions for diagnostics
  • Inlay Hints — parameter name hints on function/FB calls
  • CodeLens — reference counts, interface implementors, FB children, method overrides
  • Parser — AST visitor pattern, TYPE/STRUCT/ENUM/METHOD/INTERFACE support, typed enum parsing, VAR CONSTANT/RETAIN/PERSISTENT, CASE statement sub-code, AND_THEN/OR_ELSE operators, TYPE/UNION/NAMESPACE support
  • TwinCAT — system types and intrinsics catalog, type registry for compiled library parameter types, recursive .plcproj discovery
  • Standard library — symbol catalog for built-in types and standard function blocks

Bug Fixes

  • Downgrade unresolvable EXTENDS to warning, suppress inherited member errors
  • Allow trailing semicolons after control structures
  • Fix multiline semantic token lengths
  • TcPOU extraction and position translation for references/rename/signatureHelp

v1.1.0

GitHub Release

Features

  • TcPOU — XML/CDATA folding and dimming in TcPOU files

v1.0.0

GitHub Release

Initial release with core Language Server Protocol features for IEC 61131-3 Structured Text:

  • Syntax highlighting for .st, .tcpou, .tcgvl, .tcdut, .tcio, .tctask files
  • Code completion — keywords, built-in types, standard function blocks, local and cross-file variables
  • Hover documentation — built-in types, standard FBs, variables, POUs, pragma attributes
  • Go-to-Definition — variables, POUs, type references, FB members, cross-file via workspace index
  • Find All References — variables, type annotations, cross-file
  • Rename Symbol — variables, FOR loop variables, cross-file
  • Signature Help — function and function block call parameter hints
  • Diagnostics — real-time syntax error reporting with error recovery
  • Document Symbols — outline view with VAR section grouping
  • Workspace Symbols — Ctrl+T search for POUs and types
  • Folding Ranges — code folding for ST constructs
  • Formatting — document and range formatting
  • Semantic Tokens — enhanced syntax highlighting via semantic analysis
  • TwinCAT integration — .tsproj/.plcproj project indexing, TcPOU XML extraction
  • VS Code extension — bundled VSIX with client and server

This project follows Semantic Versioning.