feat: improve tree-sitter syntax highlighting with named nodes

- Add aliases for keywords (VAR_INPUT, BEGIN, IF, etc.) as named nodes
- Add aliases for built-in types (INT, BOOL, STRING, etc.) as type_builtin
- Add aliases for constants (TRUE, FALSE)
- Add aliases for operators (AND, OR, NOT, MOD)
- Add prefix node for # variable prefix highlighting
- Highlight FB instance names in calls
- Highlight FB parameter names as properties
- Update README with detailed syntax highlighting features
- Update .gitignore for *.wasm files

.gitignore

@@ -1,4 +1,5 @@
 *.o
 *.so
+*.wasm
 *.log
 .DS_Store

README.md

@@ -33,11 +33,15 @@ A comprehensive Neovim/LazyVim plugin providing **Language Server Protocol (LSP)
 
 ### Syntax Highlighting
 - Full SCL syntax support via tree-sitter
-- ORGANIZATION_BLOCK, FUNCTION_BLOCK, FUNCTION definitions
+- Block definitions: ORGANIZATION_BLOCK, FUNCTION_BLOCK, FUNCTION
-- Variable declarations (VAR_INPUT, VAR_OUTPUT, VAR_IN_OUT, VAR_TEMP, etc.)
+- Variable sections: VAR_INPUT, VAR_OUTPUT, VAR_IN_OUT, VAR_TEMP, VAR_CONSTANT
-- Control structures (IF/THEN/ELSE, CASE, FOR, WHILE, REPEAT)
+- Control structures: IF/THEN/ELSIF/ELSE/END_IF, CASE/OF/END_CASE, FOR/TO/BY/DO/END_FOR, WHILE/END_WHILE, REPEAT/UNTIL/END_REPEAT
-- Code regions and comments
+- Built-in data types: BOOL, INT, DINT, REAL, STRING, TIME, etc.
-- All SCL data types and operators
+- Function block instances highlighted in calls
+- FB parameter names (IN, PT, CU, etc.) highlighted as properties
+- `#` prefix for local variables highlighted
+- Operators: AND, OR, NOT, XOR, MOD
+- Comments: line (`//`), block (`(* *)`), C-style (`/* */`)
 
 ### Additional Features
 | Feature | Description |

grammar.js

@@ -13,6 +13,8 @@ module.exports = grammar({
       [$.region_statement],
       [$.region_name],
       [$.case_statement],
+      [$.fb_call, $.function_call],
+      [$.fb_parameter, $.parameter],
       [$.var_declaration, $.var_temp_declaration],
       [$.var_declaration, $.var_constant_declaration],
       [$.var_declaration, $.var_retain_declaration],
@@ -31,36 +33,36 @@ module.exports = grammar({
     ),
     
     organization_block: $ => seq(
-      'ORGANIZATION_BLOCK',
+      alias('ORGANIZATION_BLOCK', $.keyword),
       field('name', $.string),
-      optional(seq('TITLE', '=', choice($.string, $.identifier))),
+      optional(seq(alias('TITLE', $.keyword), '=', choice($.string, $.identifier))),
       optional($.attribute_list),
-      optional(seq('VERSION', ':', $.number)),
+      optional(seq(alias('VERSION', $.keyword), ':', $.number)),
       repeat($.var_declaration),
-      'BEGIN',
+      alias('BEGIN', $.keyword),
       repeat($.statement),
-      'END_ORGANIZATION_BLOCK'
+      alias('END_ORGANIZATION_BLOCK', $.keyword)
     ),
     
     function_block: $ => seq(
-      'FUNCTION_BLOCK',
+      alias('FUNCTION_BLOCK', $.keyword),
       field('name', $.string),
-      optional(seq('TITLE', '=', choice($.string, $.identifier))),
+      optional(seq(alias('TITLE', $.keyword), '=', choice($.string, $.identifier))),
       optional($.attribute_list),
-      optional(seq('VERSION', ':', $.number)),
+      optional(seq(alias('VERSION', $.keyword), ':', $.number)),
       repeat($.var_declaration),
-      'BEGIN',
+      alias('BEGIN', $.keyword),
       repeat($.statement),
-      'END_FUNCTION_BLOCK'
+      alias('END_FUNCTION_BLOCK', $.keyword)
     ),
 
     function: $ => seq(
-      'FUNCTION',
+      alias('FUNCTION', $.keyword),
       field('name', $.string),
       optional(seq(':', $.type)),
-      optional(seq('TITLE', '=', choice($.string, $.identifier))),
+      optional(seq(alias('TITLE', $.keyword), '=', choice($.string, $.identifier))),
       optional($.attribute_list),
-      optional(seq('VERSION', ':', $.number)),
+      optional(seq(alias('VERSION', $.keyword), ':', $.number)),
       repeat(choice(
         $.var_declaration,
         $.var_temp_declaration,
@@ -69,9 +71,9 @@ module.exports = grammar({
         $.var_non_retain_declaration,
         $.block_comment
       )),
-      'BEGIN',
+      alias('BEGIN', $.keyword),
       repeat($.statement),
-      'END_FUNCTION'
+      alias('END_FUNCTION', $.keyword)
     ),
     
     attribute_list: $ => seq(
@@ -90,59 +92,60 @@ module.exports = grammar({
     
     attribute_value: $ => choice(
       $.string,
-      'TRUE', 'FALSE',
+      alias('TRUE', $.constant),
+      alias('FALSE', $.constant),
       $.identifier
     ),
     
     var_declaration: $ => seq(
       choice(
-        'VAR_INPUT',
+        alias('VAR_INPUT', $.keyword),
-        'VAR_OUTPUT',
+        alias('VAR_OUTPUT', $.keyword),
-        'VAR_IN_OUT',
+        alias('VAR_IN_OUT', $.keyword),
-        'VAR',
+        alias('VAR', $.keyword),
-        'VAR_TEMP',
+        alias('VAR_TEMP', $.keyword),
-        seq('VAR', 'CONSTANT'),
+        seq(alias('VAR', $.keyword), alias('CONSTANT', $.keyword)),
-        seq('VAR', 'RETAIN'),
+        seq(alias('VAR', $.keyword), alias('RETAIN', $.keyword)),
-        seq('VAR', 'NON_RETAIN'),
+        seq(alias('VAR', $.keyword), alias('NON_RETAIN', $.keyword)),
-        'VAR_CONSTANT',
+        alias('VAR_CONSTANT', $.keyword),
-        'VAR_RETAIN',
+        alias('VAR_RETAIN', $.keyword),
-        'VAR_NON_RETAIN'
+        alias('VAR_NON_RETAIN', $.keyword)
       ),
       repeat(choice($.var_item, $.block_comment)),
-      'END_VAR'
+      alias('END_VAR', $.keyword)
     ),
 
     var_temp_declaration: $ => seq(
-      'VAR_TEMP',
+      alias('VAR_TEMP', $.keyword),
       repeat(choice($.var_item, $.block_comment)),
-      'END_VAR'
+      alias('END_VAR', $.keyword)
     ),
 
     var_constant_declaration: $ => seq(
       choice(
-        seq('VAR', 'CONSTANT'),
+        seq(alias('VAR', $.keyword), alias('CONSTANT', $.keyword)),
-        'VAR_CONSTANT'
+        alias('VAR_CONSTANT', $.keyword)
       ),
       repeat(choice($.var_item, $.block_comment)),
-      'END_VAR'
+      alias('END_VAR', $.keyword)
     ),
 
     var_retain_declaration: $ => seq(
       choice(
-        seq('VAR', 'RETAIN'),
+        seq(alias('VAR', $.keyword), alias('RETAIN', $.keyword)),
-        'VAR_RETAIN'
+        alias('VAR_RETAIN', $.keyword)
       ),
       repeat(choice($.var_item, $.block_comment)),
-      'END_VAR'
+      alias('END_VAR', $.keyword)
     ),
 
     var_non_retain_declaration: $ => seq(
       choice(
-        seq('VAR', 'NON_RETAIN'),
+        seq(alias('VAR', $.keyword), alias('NON_RETAIN', $.keyword)),
-        'VAR_NON_RETAIN'
+        alias('VAR_NON_RETAIN', $.keyword)
       ),
       repeat(choice($.var_item, $.block_comment)),
-      'END_VAR'
+      alias('END_VAR', $.keyword)
     ),
     
     var_item: $ => seq(
@@ -155,33 +158,69 @@ module.exports = grammar({
     ),
     
     type: $ => choice(
-      'BOOL', 'Bool',
+      alias('BOOL', $.type_builtin),
-      'INT', 'Int', 'int',
+      alias('Bool', $.type_builtin),
-      'DINT', 'DInt', 'dint',
+      alias('INT', $.type_builtin),
-      'SINT', 'SInt', 'sint',
+      alias('Int', $.type_builtin),
-      'USINT', 'USInt', 'usint',
+      alias('int', $.type_builtin),
-      'UINT', 'UInt', 'uint',
+      alias('DINT', $.type_builtin),
-      'WORD', 'Word', 'word',
+      alias('DInt', $.type_builtin),
-      'DWORD', 'DWord', 'dword',
+      alias('dint', $.type_builtin),
-      'BYTE', 'Byte', 'byte',
+      alias('SINT', $.type_builtin),
-      'REAL', 'Real', 'real',
+      alias('SInt', $.type_builtin),
-      'LREAL', 'LReal', 'lreal',
+      alias('sint', $.type_builtin),
-      'TIME', 'Time', 'time',
+      alias('USINT', $.type_builtin),
-      'TOD', 'Tod', 'tod',
+      alias('USInt', $.type_builtin),
-      'DT', 'Dt', 'dt',
+      alias('usint', $.type_builtin),
-      'String', 'STRING', 'string',
+      alias('UINT', $.type_builtin),
-      seq(choice('String', 'STRING', 'string'), '[', $.number, ']'),
+      alias('UInt', $.type_builtin),
-      'WString', 'WSTRING', 'wstring',
+      alias('uint', $.type_builtin),
-      seq(choice('WString', 'WSTRING', 'wstring'), '[', $.number, ']'),
+      alias('WORD', $.type_builtin),
-      'Char', 'CHAR', 'char',
+      alias('Word', $.type_builtin),
-      'WChar', 'WCHAR', 'wchar',
+      alias('word', $.type_builtin),
-      seq('ARRAY', '[', $.number, '..', $.number, ']', 'OF', $.type),
+      alias('DWORD', $.type_builtin),
+      alias('DWord', $.type_builtin),
+      alias('dword', $.type_builtin),
+      alias('BYTE', $.type_builtin),
+      alias('Byte', $.type_builtin),
+      alias('byte', $.type_builtin),
+      alias('REAL', $.type_builtin),
+      alias('Real', $.type_builtin),
+      alias('real', $.type_builtin),
+      alias('LREAL', $.type_builtin),
+      alias('LReal', $.type_builtin),
+      alias('lreal', $.type_builtin),
+      alias('TIME', $.type_builtin),
+      alias('Time', $.type_builtin),
+      alias('time', $.type_builtin),
+      alias('TOD', $.type_builtin),
+      alias('Tod', $.type_builtin),
+      alias('tod', $.type_builtin),
+      alias('DT', $.type_builtin),
+      alias('Dt', $.type_builtin),
+      alias('dt', $.type_builtin),
+      alias('String', $.type_builtin),
+      alias('STRING', $.type_builtin),
+      alias('string', $.type_builtin),
+      seq(choice(alias('String', $.type_builtin), alias('STRING', $.type_builtin), alias('string', $.type_builtin)), '[', $.number, ']'),
+      alias('WString', $.type_builtin),
+      alias('WSTRING', $.type_builtin),
+      alias('wstring', $.type_builtin),
+      seq(choice(alias('WString', $.type_builtin), alias('WSTRING', $.type_builtin), alias('wstring', $.type_builtin)), '[', $.number, ']'),
+      alias('Char', $.type_builtin),
+      alias('CHAR', $.type_builtin),
+      alias('char', $.type_builtin),
+      alias('WChar', $.type_builtin),
+      alias('WCHAR', $.type_builtin),
+      alias('wchar', $.type_builtin),
+      seq(alias('ARRAY', $.keyword), '[', $.number, '..', $.number, ']', alias('OF', $.keyword), $.type),
       $.identifier,
       $.string
     ),
     
     statement: $ => choice(
       $.assignment,
+      $.fb_call,
       $.if_statement,
       $.case_statement,
       $.for_statement,
@@ -201,6 +240,26 @@ module.exports = grammar({
 
     empty_statement: $ => ';',
 
+    fb_call: $ => seq(
+      field('instance', choice($.prefixed_identifier, $.identifier)),
+      '(',
+      optional(seq(
+        $.fb_parameter_list
+      )),
+      ')'
+    ),
+
+    fb_parameter_list: $ => seq(
+      $.fb_parameter,
+      repeat(seq(',', $.fb_parameter))
+    ),
+
+    fb_parameter: $ => seq(
+      field('name', $.identifier),
+      choice(':=', '=>'),
+      $.expression
+    ),
+    
     assignment: $ => seq(
       field('target', $.lvalue),
       ':=',
@@ -218,63 +277,83 @@ module.exports = grammar({
 
     function_name: $ => $.string,
     
-    prefixed_identifier: $ => seq('#', $.identifier),
+    prefixed_identifier: $ => seq(alias('#', $.prefix), $.identifier),
     
     field_access: $ => seq($.lvalue, '.', choice($.identifier, $.prefixed_identifier)),
     
     array_access: $ => seq($.lvalue, '[', $.expression, ']'),
     
     if_statement: $ => seq(
-      'IF', $.expression, 'THEN',
+      alias('IF', $.keyword),
+      $.expression,
+      alias('THEN', $.keyword),
       repeat($.statement),
       repeat($.elsif_clause),
       optional($.else_clause),
-      'END_IF'
+      alias('END_IF', $.keyword)
     ),
     
     elsif_clause: $ => seq(
-      'ELSIF', $.expression, 'THEN', repeat($.statement)
+      alias('ELSIF', $.keyword),
+      $.expression,
+      alias('THEN', $.keyword),
+      repeat($.statement)
     ),
     
-    else_clause: $ => seq('ELSE', repeat($.statement)),
+    else_clause: $ => seq(alias('ELSE', $.keyword), repeat($.statement)),
     
     case_statement: $ => seq(
-      'CASE', $.expression, 'OF',
+      alias('CASE', $.keyword),
+      $.expression,
+      alias('OF', $.keyword),
       repeat($.case_item),
       optional($.else_clause),
-      'END_CASE',
+      alias('END_CASE', $.keyword),
       optional(';')
     ),
     
     case_item: $ => seq(
       choice($.number, $.identifier, $.prefixed_identifier, $.range),
-      ':', repeat($.statement)
+      ':',
+      repeat($.statement)
     ),
     
     range: $ => seq($.number, '..', $.number),
     
     for_statement: $ => seq(
-      'FOR', $.identifier, ':=', $.expression, 'TO', $.expression, optional(seq('BY', $.expression)), 'DO',
+      alias('FOR', $.keyword),
+      $.identifier,
+      ':=',
+      $.expression,
+      alias('TO', $.keyword),
+      $.expression,
+      optional(seq(alias('BY', $.keyword), $.expression)),
+      alias('DO', $.keyword),
       repeat($.statement),
-      'END_FOR'
+      alias('END_FOR', $.keyword)
     ),
 
     while_statement: $ => seq(
-      'WHILE', $.expression, 'DO',
+      alias('WHILE', $.keyword),
+      $.expression,
+      alias('DO', $.keyword),
       repeat($.statement),
-      'END_WHILE'
+      alias('END_WHILE', $.keyword)
     ),
 
     repeat_statement: $ => seq(
-      'REPEAT',
+      alias('REPEAT', $.keyword),
       repeat($.statement),
-      'UNTIL', $.expression, 'END_REPEAT'
+      alias('UNTIL', $.keyword),
+      $.expression,
+      alias('END_REPEAT', $.keyword)
     ),
     
     region_statement: $ => seq(
-      'REGION', $.region_name,
+      alias('REGION', $.keyword),
+      $.region_name,
       repeat($.statement),
-      'END_REGION',
+      alias('END_REGION', $.keyword),
       optional($.region_name)
     ),
 
@@ -320,19 +399,19 @@ module.exports = grammar({
     ),
     
     unary_expression: $ => prec.right(10, choice(
-      seq('NOT', $.expression),
+      seq(alias('NOT', $.operator), $.expression),
       seq('+', $.expression),
       seq('-', $.expression)
     )),
     
     binary_expression: $ => choice(
-      prec.left(2, seq($.expression, 'OR', $.expression)),
+      prec.left(2, seq($.expression, alias('OR', $.operator), $.expression)),
-      prec.left(3, seq($.expression, 'XOR', $.expression)),
+      prec.left(3, seq($.expression, alias('XOR', $.operator), $.expression)),
-      prec.left(4, seq($.expression, 'AND', $.expression)),
+      prec.left(4, seq($.expression, alias('AND', $.operator), $.expression)),
       prec.left(5, seq($.expression, choice('=', '<>'), $.expression)),
       prec.left(6, seq($.expression, choice('<', '>', '<=', '>='), $.expression)),
       prec.left(7, seq($.expression, choice('+', '-'), $.expression)),
-      prec.left(8, seq($.expression, choice('*', '/', 'MOD'), $.expression))
+      prec.left(8, seq($.expression, choice('*', '/', alias('MOD', $.operator)), $.expression))
     ),
     
     number: $ => token(/\d+(\.\d+)?/),
@@ -346,13 +425,11 @@ module.exports = grammar({
       seq('"', repeat(choice(/[^"\n]/, '""')), '"')
     ),
 
-    // Support for STRING type with length: STRING[80]
     string_type: $ => seq(
-      choice('STRING', 'String', 'string', 'WSTRING', 'WString', 'wstring'),
+      choice(alias('STRING', $.type_builtin), alias('String', $.type_builtin), alias('string', $.type_builtin), alias('WSTRING', $.type_builtin), alias('WString', $.type_builtin), alias('wstring', $.type_builtin)),
       optional(seq('[', $.number, ']'))
     ),
 
-    // Support for SCL character literals: 'A', WCHAR#'B'
     char_literal: $ => choice(
       seq("'", /[^']/, "'"),
       seq('WCHAR#', "'", /[^']/, "'")
@@ -374,9 +451,9 @@ module.exports = grammar({
       '*/)'
     )),
 
-    exit_statement: $ => 'EXIT',
+    exit_statement: $ => alias('EXIT', $.keyword),
 
-    continue_statement: $ => 'CONTINUE'
+    continue_statement: $ => alias('CONTINUE', $.keyword)
     
   }
 });

src/builtin_instructions.lua

@@ -226,6 +226,67 @@ M.DATA_TYPES = {
   DTL = true,
 }
 
+M.PARAMETERS = {
+  TON = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  TOF = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  TP = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  TONR = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" }, { name = "R", type = "BOOL" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  CTU = { inputs = { { name = "CU", type = "BOOL" }, { name = "R", type = "BOOL" }, { name = "PV", type = "INT" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "CV", type = "INT" } } },
+  CTD = { inputs = { { name = "CD", type = "BOOL" }, { name = "LD", type = "BOOL" }, { name = "PV", type = "INT" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "CV", type = "INT" } } },
+  CTUD = { inputs = { { name = "CU", type = "BOOL" }, { name = "CD", type = "BOOL" }, { name = "R", type = "BOOL" }, { name = "LD", type = "BOOL" }, { name = "PV", type = "INT" } }, outputs = { { name = "QU", type = "BOOL" }, { name = "QD", type = "BOOL" }, { name = "CV", type = "INT" } } },
+  R_TRIG = { inputs = { { name = "CLK", type = "BOOL" } }, outputs = { { name = "Q", type = "BOOL" } } },
+  F_TRIG = { inputs = { { name = "CLK", type = "BOOL" } }, outputs = { { name = "Q", type = "BOOL" } } },
+  SR = { inputs = { { name = "S", type = "BOOL" }, { name = "R1", type = "BOOL" } }, outputs = { { name = "Q1", type = "BOOL" } } },
+  RS = { inputs = { { name = "S1", type = "BOOL" }, { name = "R", type = "BOOL" } }, outputs = { { name = "Q1", type = "BOOL" } } },
+  IEC_TIMER = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  IEC_TON = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  IEC_TOF = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  IEC_TP = { inputs = { { name = "IN", type = "BOOL" }, { name = "PT", type = "TIME" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "ET", type = "TIME" } } },
+  IEC_COUNTER = { inputs = { { name = "CU", type = "BOOL" }, { name = "CD", type = "BOOL" }, { name = "R", type = "BOOL" }, { name = "LD", type = "BOOL" }, { name = "PV", type = "INT" } }, outputs = { { name = "QU", type = "BOOL" }, { name = "QD", type = "BOOL" }, { name = "CV", type = "INT" } } },
+  IEC_CTU = { inputs = { { name = "CU", type = "BOOL" }, { name = "R", type = "BOOL" }, { name = "PV", type = "INT" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "CV", type = "INT" } } },
+  IEC_CTD = { inputs = { { name = "CD", type = "BOOL" }, { name = "LD", type = "BOOL" }, { name = "PV", type = "INT" } }, outputs = { { name = "Q", type = "BOOL" }, { name = "CV", type = "INT" } } },
+  IEC_CTUD = { inputs = { { name = "CU", type = "BOOL" }, { name = "CD", type = "BOOL" }, { name = "R", type = "BOOL" }, { name = "LD", type = "BOOL" }, { name = "PV", type = "INT" } }, outputs = { { name = "QU", type = "BOOL" }, { name = "QD", type = "BOOL" }, { name = "CV", type = "INT" } } },
+  ADD = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  SUB = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  MUL = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  DIV = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  MIN = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  MAX = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  LIMIT = { inputs = { { name = "MN" }, { name = "IN" }, { name = "MX" } }, outputs = { { name = "OUT" } } },
+  MOVE = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  CONVERT = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  ROUND = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  TRUNC = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  CEIL = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  FLOOR = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  SQR = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  SQRT = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  SIN = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  COS = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  TAN = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  ASIN = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  ACOS = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  ATAN = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  LEN = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  CONCAT = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  LEFT = { inputs = { { name = "IN" }, { name = "L" } }, outputs = { { name = "OUT" } } },
+  RIGHT = { inputs = { { name = "IN" }, { name = "L" } }, outputs = { { name = "OUT" } } },
+  MID = { inputs = { { name = "IN" }, { name = "L" }, { name = "P" } }, outputs = { { name = "OUT" } } },
+  AND = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  OR = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  XOR = { inputs = { { name = "IN1" }, { name = "IN2" } }, outputs = { { name = "OUT" } } },
+  SHL = { inputs = { { name = "IN" }, { name = "N" } }, outputs = { { name = "OUT" } } },
+  SHR = { inputs = { { name = "IN" }, { name = "N" } }, outputs = { { name = "OUT" } } },
+  ROL = { inputs = { { name = "IN" }, { name = "N" } }, outputs = { { name = "OUT" } } },
+  ROR = { inputs = { { name = "IN" }, { name = "N" } }, outputs = { { name = "OUT" } } },
+  BCD_I = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+  I_BCD = { inputs = { { name = "IN" } }, outputs = { { name = "OUT" } } },
+}
+
+function M.get_parameters(name)
+  return M.PARAMETERS[name:upper()]
+end
+
 function M.is_known_function(name)
   return M.FUNCTIONS[name:upper()] or false
 end

src/main.lua

@@ -335,6 +335,30 @@ function handlers.textDocument_hover(params)
 			var_info.data_type or "unknown",
 			var_info.line + 1
 		)
+
+		if var_info.comment and var_info.comment ~= "" then
+			detail = detail .. "\n\n" .. var_info.comment
+		end
+
+		if var_info.data_type then
+			local builtin_params = builtin.get_parameters(var_info.data_type)
+			if builtin_params then
+				detail = detail .. "\n\n**Members:**\n"
+				if builtin_params.inputs and #builtin_params.inputs > 0 then
+					detail = detail .. "*Inputs:*\n"
+					for _, inp in ipairs(builtin_params.inputs) do
+						detail = detail .. string.format("  - `%s`: %s\n", inp.name, inp.type or "ANY")
+					end
+				end
+				if builtin_params.outputs and #builtin_params.outputs > 0 then
+					detail = detail .. "*Outputs:*\n"
+					for _, out in ipairs(builtin_params.outputs) do
+						detail = detail .. string.format("  - `%s`: %s\n", out.name, out.type or "ANY")
+					end
+				end
+			end
+		end
+
 		return {
 			contents = { kind = "markdown", value = detail },
 			range = {
@@ -348,10 +372,17 @@ function handlers.textDocument_hover(params)
 		for type_name, type_info in pairs(doc.types) do
 			if type_name == word then
 				local detail = string.format("**Type**: `%s`\nKind: %s", type_name, type_info.kind)
+				if type_info.comment and type_info.comment ~= "" then
+					detail = detail .. "\n\n" .. type_info.comment
+				end
 				if type_info.kind == "struct" and type_info.fields then
 					detail = detail .. "\n\n**Fields:**\n"
 					for _, field in ipairs(type_info.fields) do
-						detail = detail .. string.format("- `%s`: %s\n", field.name, field.type)
+						if field.comment and field.comment ~= "" then
+							detail = detail .. string.format("- `%s`: %s // %s\n", field.name, field.type, field.comment)
+						else
+							detail = detail .. string.format("- `%s`: %s\n", field.name, field.type)
+						end
 					end
 				end
 				return {
@@ -365,6 +396,124 @@ function handlers.textDocument_hover(params)
 		end
 	end
 
+	if builtin.is_known_function_block(word) or builtin.is_known_function(word) then
+		local params_info = builtin.get_parameters(word)
+		local kind = builtin.is_known_function_block(word) and "Function Block" or "Function"
+		local detail = string.format("**%s**: `%s`\n", kind, word)
+		if params_info then
+			detail = detail .. "\n**Parameters:**\n"
+			if params_info.inputs and #params_info.inputs > 0 then
+				detail = detail .. "*Inputs:*\n"
+				for _, inp in ipairs(params_info.inputs) do
+					detail = detail .. string.format("  - `%s`: %s\n", inp.name, inp.type or "ANY")
+				end
+			end
+			if params_info.outputs and #params_info.outputs > 0 then
+				detail = detail .. "*Outputs:*\n"
+				for _, out in ipairs(params_info.outputs) do
+					detail = detail .. string.format("  - `%s`: %s\n", out.name, out.type or "ANY")
+				end
+			end
+		else
+			detail = detail .. "\n_(No parameter info available)_"
+		end
+		return {
+			contents = { kind = "markdown", value = detail },
+			range = {
+				start = { line = params.position.line, character = word_start - 1 },
+				["end"] = { line = params.position.line, character = word_end - 1 },
+			},
+		}
+	end
+
+	local fb_param_info = nil
+
+	local function find_fb_call_start(lines, current_line_idx)
+		for i = current_line_idx, 1, -1 do
+			local l = lines[i]
+			local fb_name = l:match("#([%w_]+)%s*%(") or l:match("([%w_]+)%s*%(")
+			if fb_name and doc.variables and doc.variables[fb_name] then
+				return fb_name, i
+			end
+			if l:match("%)%s*;%s*$") then
+				break
+			end
+		end
+		return nil, nil
+	end
+
+	local fb_name_on_line, _ = find_fb_call_start(lines, line_idx)
+	if fb_name_on_line then
+		local fb_var = doc.variables[fb_name_on_line]
+		if fb_var then
+			local fb_type = fb_var.data_type
+			if fb_type then
+				local clean_type = fb_type:gsub('"', ""):gsub("#", "")
+				local params_info = builtin.get_parameters(clean_type)
+
+				if not params_info then
+					local workspace_types = plc_json.get_types(doc.root_dir)
+					if workspace_types and workspace_types[clean_type] then
+						local ws_type = workspace_types[clean_type]
+						if ws_type.kind == "function_block" or ws_type.kind == "function" then
+							local fields = {}
+							for _, f in ipairs(ws_type.inputs or {}) do
+								table.insert(fields, { name = f.name, type = f.type, comment = f.comment })
+							end
+							params_info = { inputs = fields, outputs = ws_type.outputs or {} }
+						elseif ws_type.fields then
+							local fields = {}
+							for _, f in ipairs(ws_type.fields) do
+								table.insert(fields, { name = f.name, type = f.type, comment = f.comment })
+							end
+							params_info = { inputs = fields, outputs = {} }
+						end
+					end
+				end
+
+				if not params_info and doc.types and doc.types[clean_type] and doc.types[clean_type].fields then
+					local fields = {}
+					for _, f in ipairs(doc.types[clean_type].fields) do
+						table.insert(fields, { name = f.name, type = f.type, comment = f.comment })
+					end
+					params_info = { inputs = fields, outputs = {} }
+				end
+
+				if params_info then
+					for _, inp in ipairs(params_info.inputs or {}) do
+						if inp.name:upper() == word:upper() then
+							fb_param_info = { name = inp.name, type = inp.type, direction = "input", comment = inp.comment }
+							break
+						end
+					end
+					if not fb_param_info then
+						for _, out in ipairs(params_info.outputs or {}) do
+							if out.name:upper() == word:upper() then
+								fb_param_info = { name = out.name, type = out.type, direction = "output", comment = out.comment }
+								break
+							end
+						end
+					end
+				end
+			end
+		end
+	end
+
+	if fb_param_info then
+		local detail = string.format("**Parameter**: `%s`\nType: `%s`\nDirection: %s",
+			fb_param_info.name, fb_param_info.type or "ANY", fb_param_info.direction)
+		if fb_param_info.comment and fb_param_info.comment ~= "" then
+			detail = detail .. "\n\n" .. fb_param_info.comment
+		end
+		return {
+			contents = { kind = "markdown", value = detail },
+			range = {
+				start = { line = params.position.line, character = word_start - 1 },
+				["end"] = { line = params.position.line, character = word_end - 1 },
+			},
+		}
+	end
+
 	return nil
 end
 
@@ -432,9 +581,10 @@ function handlers.textDocument_completion(params)
 				local var_info = doc.variables and doc.variables[var_name]
 				local data_type = var_info and var_info.data_type
 
-				if data_type and doc.types then
+				if data_type then
 					local struct_name = data_type
-					if doc.types[struct_name] and doc.types[struct_name].fields then
+
+					if doc.types and doc.types[struct_name] and doc.types[struct_name].fields then
 						for _, field in ipairs(doc.types[struct_name].fields) do
 							table.insert(items, {
 								label = field.name,
@@ -444,6 +594,28 @@ function handlers.textDocument_completion(params)
 								insertTextFormat = 1,
 							})
 						end
+					else
+						local builtin_params = builtin.get_parameters(struct_name)
+						if builtin_params then
+							for _, inp in ipairs(builtin_params.inputs or {}) do
+								table.insert(items, {
+									label = inp.name,
+									kind = 13,
+									detail = struct_name .. "." .. inp.name .. ": " .. (inp.type or "ANY"),
+									insertText = inp.name,
+									insertTextFormat = 1,
+								})
+							end
+							for _, out in ipairs(builtin_params.outputs or {}) do
+								table.insert(items, {
+									label = out.name,
+									kind = 13,
+									detail = struct_name .. "." .. out.name .. ": " .. (out.type or "ANY"),
+									insertText = out.name,
+									insertTextFormat = 1,
+								})
+							end
+						end
 					end
 				end
 			end

src/node-types.json

@@ -84,8 +84,12 @@
     "fields": {},
     "children": {
       "multiple": false,
-      "required": false,
+      "required": true,
       "types": [
+        {
+          "type": "constant",
+          "named": true
+        },
         {
           "type": "identifier",
           "named": true
@@ -108,6 +112,10 @@
         {
           "type": "expression",
           "named": true
+        },
+        {
+          "type": "operator",
+          "named": true
         }
       ]
     }
@@ -162,6 +170,25 @@
         {
           "type": "expression",
           "named": true
+        },
+        {
+          "type": "keyword",
+          "named": true
+        }
+      ]
+    }
+  },
+  {
+    "type": "continue_statement",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "keyword",
+          "named": true
         }
       ]
     }
@@ -172,8 +199,12 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "statement",
           "named": true
@@ -193,6 +224,10 @@
           "type": "expression",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "statement",
           "named": true
@@ -205,6 +240,21 @@
     "named": true,
     "fields": {}
   },
+  {
+    "type": "exit_statement",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "keyword",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "expression",
     "named": true,
@@ -264,6 +314,77 @@
       ]
     }
   },
+  {
+    "type": "fb_call",
+    "named": true,
+    "fields": {
+      "instance": {
+        "multiple": false,
+        "required": true,
+        "types": [
+          {
+            "type": "identifier",
+            "named": true
+          },
+          {
+            "type": "prefixed_identifier",
+            "named": true
+          }
+        ]
+      }
+    },
+    "children": {
+      "multiple": false,
+      "required": false,
+      "types": [
+        {
+          "type": "fb_parameter_list",
+          "named": true
+        }
+      ]
+    }
+  },
+  {
+    "type": "fb_parameter",
+    "named": true,
+    "fields": {
+      "name": {
+        "multiple": false,
+        "required": true,
+        "types": [
+          {
+            "type": "identifier",
+            "named": true
+          }
+        ]
+      }
+    },
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "expression",
+          "named": true
+        }
+      ]
+    }
+  },
+  {
+    "type": "fb_parameter_list",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "fb_parameter",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "field_access",
     "named": true,
@@ -303,6 +424,10 @@
           "type": "identifier",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "statement",
           "named": true
@@ -327,7 +452,7 @@
     },
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "attribute_list",
@@ -341,6 +466,10 @@
           "type": "identifier",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "number",
           "named": true
@@ -397,7 +526,7 @@
     },
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "attribute_list",
@@ -407,6 +536,10 @@
           "type": "identifier",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "number",
           "named": true
@@ -484,6 +617,10 @@
           "type": "expression",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "statement",
           "named": true
@@ -539,7 +676,7 @@
     },
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "attribute_list",
@@ -549,6 +686,10 @@
           "type": "identifier",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "number",
           "named": true
@@ -607,12 +748,16 @@
     "named": true,
     "fields": {},
     "children": {
-      "multiple": false,
+      "multiple": true,
       "required": true,
       "types": [
         {
           "type": "identifier",
           "named": true
+        },
+        {
+          "type": "prefix",
+          "named": true
         }
       ]
     }
@@ -659,6 +804,10 @@
       "multiple": true,
       "required": true,
       "types": [
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "region_name",
           "named": true
@@ -682,6 +831,10 @@
           "type": "expression",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "statement",
           "named": true
@@ -745,6 +898,10 @@
           "type": "exit_statement",
           "named": true
         },
+        {
+          "type": "fb_call",
+          "named": true
+        },
         {
           "type": "for_statement",
           "named": true
@@ -803,12 +960,16 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "identifier",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "number",
           "named": true
@@ -820,6 +981,10 @@
         {
           "type": "type",
           "named": true
+        },
+        {
+          "type": "type_builtin",
+          "named": true
         }
       ]
     }
@@ -829,12 +994,16 @@
     "named": true,
     "fields": {},
     "children": {
-      "multiple": false,
+      "multiple": true,
       "required": true,
       "types": [
         {
           "type": "expression",
           "named": true
+        },
+        {
+          "type": "operator",
+          "named": true
         }
       ]
     }
@@ -845,12 +1014,16 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "block_comment",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "var_item",
           "named": true
@@ -864,12 +1037,16 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "block_comment",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "var_item",
           "named": true
@@ -923,12 +1100,16 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "block_comment",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "var_item",
           "named": true
@@ -942,12 +1123,16 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "block_comment",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "var_item",
           "named": true
@@ -961,12 +1146,16 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": false,
+      "required": true,
       "types": [
         {
           "type": "block_comment",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "var_item",
           "named": true
@@ -986,6 +1175,10 @@
           "type": "expression",
           "named": true
         },
+        {
+          "type": "keyword",
+          "named": true
+        },
         {
           "type": "statement",
           "named": true
@@ -1001,10 +1194,6 @@
     "type": "\"\"",
     "named": false
   },
-  {
-    "type": "#",
-    "named": false
-  },
   {
     "type": "'",
     "named": false
@@ -1089,346 +1278,6 @@
     "type": ">=",
     "named": false
   },
-  {
-    "type": "AND",
-    "named": false
-  },
-  {
-    "type": "ARRAY",
-    "named": false
-  },
-  {
-    "type": "BEGIN",
-    "named": false
-  },
-  {
-    "type": "BOOL",
-    "named": false
-  },
-  {
-    "type": "BY",
-    "named": false
-  },
-  {
-    "type": "BYTE",
-    "named": false
-  },
-  {
-    "type": "Bool",
-    "named": false
-  },
-  {
-    "type": "Byte",
-    "named": false
-  },
-  {
-    "type": "CASE",
-    "named": false
-  },
-  {
-    "type": "CHAR",
-    "named": false
-  },
-  {
-    "type": "CONSTANT",
-    "named": false
-  },
-  {
-    "type": "Char",
-    "named": false
-  },
-  {
-    "type": "DINT",
-    "named": false
-  },
-  {
-    "type": "DInt",
-    "named": false
-  },
-  {
-    "type": "DO",
-    "named": false
-  },
-  {
-    "type": "DT",
-    "named": false
-  },
-  {
-    "type": "DWORD",
-    "named": false
-  },
-  {
-    "type": "DWord",
-    "named": false
-  },
-  {
-    "type": "Dt",
-    "named": false
-  },
-  {
-    "type": "ELSE",
-    "named": false
-  },
-  {
-    "type": "ELSIF",
-    "named": false
-  },
-  {
-    "type": "END_CASE",
-    "named": false
-  },
-  {
-    "type": "END_FOR",
-    "named": false
-  },
-  {
-    "type": "END_FUNCTION",
-    "named": false
-  },
-  {
-    "type": "END_FUNCTION_BLOCK",
-    "named": false
-  },
-  {
-    "type": "END_IF",
-    "named": false
-  },
-  {
-    "type": "END_ORGANIZATION_BLOCK",
-    "named": false
-  },
-  {
-    "type": "END_REGION",
-    "named": false
-  },
-  {
-    "type": "END_REPEAT",
-    "named": false
-  },
-  {
-    "type": "END_VAR",
-    "named": false
-  },
-  {
-    "type": "END_WHILE",
-    "named": false
-  },
-  {
-    "type": "FALSE",
-    "named": false
-  },
-  {
-    "type": "FOR",
-    "named": false
-  },
-  {
-    "type": "FUNCTION",
-    "named": false
-  },
-  {
-    "type": "FUNCTION_BLOCK",
-    "named": false
-  },
-  {
-    "type": "IF",
-    "named": false
-  },
-  {
-    "type": "INT",
-    "named": false
-  },
-  {
-    "type": "Int",
-    "named": false
-  },
-  {
-    "type": "LREAL",
-    "named": false
-  },
-  {
-    "type": "LReal",
-    "named": false
-  },
-  {
-    "type": "MOD",
-    "named": false
-  },
-  {
-    "type": "NON_RETAIN",
-    "named": false
-  },
-  {
-    "type": "NOT",
-    "named": false
-  },
-  {
-    "type": "OF",
-    "named": false
-  },
-  {
-    "type": "OR",
-    "named": false
-  },
-  {
-    "type": "ORGANIZATION_BLOCK",
-    "named": false
-  },
-  {
-    "type": "REAL",
-    "named": false
-  },
-  {
-    "type": "REGION",
-    "named": false
-  },
-  {
-    "type": "REPEAT",
-    "named": false
-  },
-  {
-    "type": "RETAIN",
-    "named": false
-  },
-  {
-    "type": "Real",
-    "named": false
-  },
-  {
-    "type": "SINT",
-    "named": false
-  },
-  {
-    "type": "SInt",
-    "named": false
-  },
-  {
-    "type": "STRING",
-    "named": false
-  },
-  {
-    "type": "String",
-    "named": false
-  },
-  {
-    "type": "THEN",
-    "named": false
-  },
-  {
-    "type": "TIME",
-    "named": false
-  },
-  {
-    "type": "TITLE",
-    "named": false
-  },
-  {
-    "type": "TO",
-    "named": false
-  },
-  {
-    "type": "TOD",
-    "named": false
-  },
-  {
-    "type": "TRUE",
-    "named": false
-  },
-  {
-    "type": "Time",
-    "named": false
-  },
-  {
-    "type": "Tod",
-    "named": false
-  },
-  {
-    "type": "UINT",
-    "named": false
-  },
-  {
-    "type": "UInt",
-    "named": false
-  },
-  {
-    "type": "UNTIL",
-    "named": false
-  },
-  {
-    "type": "USINT",
-    "named": false
-  },
-  {
-    "type": "USInt",
-    "named": false
-  },
-  {
-    "type": "VAR",
-    "named": false
-  },
-  {
-    "type": "VAR_CONSTANT",
-    "named": false
-  },
-  {
-    "type": "VAR_INPUT",
-    "named": false
-  },
-  {
-    "type": "VAR_IN_OUT",
-    "named": false
-  },
-  {
-    "type": "VAR_NON_RETAIN",
-    "named": false
-  },
-  {
-    "type": "VAR_OUTPUT",
-    "named": false
-  },
-  {
-    "type": "VAR_RETAIN",
-    "named": false
-  },
-  {
-    "type": "VAR_TEMP",
-    "named": false
-  },
-  {
-    "type": "VERSION",
-    "named": false
-  },
-  {
-    "type": "WCHAR",
-    "named": false
-  },
-  {
-    "type": "WChar",
-    "named": false
-  },
-  {
-    "type": "WHILE",
-    "named": false
-  },
-  {
-    "type": "WORD",
-    "named": false
-  },
-  {
-    "type": "WSTRING",
-    "named": false
-  },
-  {
-    "type": "WString",
-    "named": false
-  },
-  {
-    "type": "Word",
-    "named": false
-  },
-  {
-    "type": "XOR",
-    "named": false
-  },
   {
     "type": "[",
     "named": false
@@ -1442,37 +1291,13 @@
     "named": true,
     "extra": true
   },
-  {
-    "type": "byte",
-    "named": false
-  },
   {
     "type": "c_style_comment",
     "named": true,
     "extra": true
   },
   {
-    "type": "char",
+    "type": "constant",
-    "named": false
-  },
-  {
-    "type": "continue_statement",
-    "named": true
-  },
-  {
-    "type": "dint",
-    "named": false
-  },
-  {
-    "type": "dt",
-    "named": false
-  },
-  {
-    "type": "dword",
-    "named": false
-  },
-  {
-    "type": "exit_statement",
     "named": true
   },
   {
@@ -1484,73 +1309,33 @@
     "named": true
   },
   {
-    "type": "int",
+    "type": "keyword",
-    "named": false
+    "named": true
   },
   {
     "type": "line_comment",
     "named": true,
     "extra": true
   },
-  {
-    "type": "lreal",
-    "named": false
-  },
   {
     "type": "number",
     "named": true
   },
   {
-    "type": "real",
+    "type": "operator",
-    "named": false
+    "named": true
   },
   {
-    "type": "sint",
+    "type": "prefix",
-    "named": false
+    "named": true
-  },
-  {
-    "type": "string",
-    "named": false
-  },
-  {
-    "type": "time",
-    "named": false
   },
   {
     "type": "time_value",
     "named": true
   },
   {
-    "type": "tod",
+    "type": "type_builtin",
-    "named": false
+    "named": true
-  },
-  {
-    "type": "TOD",
-    "named": false
-  },
-  {
-    "type": "uint",
-    "named": false
-  },
-  {
-    "type": "UInt",
-    "named": false
-  },
-  {
-    "type": "usint",
-    "named": false
-  },
-  {
-    "type": "wchar",
-    "named": false
-  },
-  {
-    "type": "word",
-    "named": false
-  },
-  {
-    "type": "wstring",
-    "named": false
   },
   {
     "type": "{",

src/parser.lua

@@ -129,6 +129,10 @@ function M.extract_variables(content)
           end
         end
         local var_data_type = "unknown"
+        local var_comment = line:match("//%s*(.+)$")
+        if not var_comment then
+          var_comment = line:match("%(%*(.-)%*%)")
+        end
         if type_start then
           local type_part = line:sub(type_start + 1)
           type_part = type_part:gsub("%s*:=.*$", "")
@@ -143,6 +147,7 @@ function M.extract_variables(content)
           data_type = var_data_type,
           line = line_num,
           character = col - 1,
+          comment = var_comment,
         }
         variable_positions[var_name] = {
           line = line_num,
@@ -172,6 +177,7 @@ function M.extract_types(content)
   local brace_depth = 0
   local in_struct = false
   local pending_type_name = nil
+  local pending_comment = nil
 
   local function extract_type_name(after_colon)
     if not after_colon then return nil end
@@ -183,6 +189,11 @@ function M.extract_types(content)
   for i, line in ipairs(lines) do
     local trimmed = line:gsub("^%s+", ""):gsub("%s+$", "")
 
+    local is_comment_only = trimmed:match("^//")
+    if is_comment_only then
+      pending_comment = line:match("//%s*(.+)$")
+    end
+
     local is_type_line = trimmed:match("^TYPE") and (trimmed:match("^TYPE%s") or trimmed:match('^TYPE"') or trimmed == "TYPE")
     
     if is_type_line then
@@ -190,6 +201,9 @@ function M.extract_types(content)
       in_struct = false
       brace_depth = 0
       pending_type_name = trimmed:match('^TYPE%s+"([^"]+)') or trimmed:match("^TYPE%s+(%w+)")
+      if not pending_comment then
+        pending_comment = trimmed:match("//%s*(.+)$")
+      end
     elseif in_type_section and trimmed:match("^END_TYPE") then
       in_type_section = false
       in_struct = false
@@ -203,10 +217,12 @@ function M.extract_types(content)
           kind = "struct",
           fields = {},
           start_line = i - 1,
+          comment = pending_comment,
         }
         types[type_name_with_struct] = current_type
         in_struct = true
         pending_type_name = nil
+        pending_comment = nil
       elseif trimmed:match("^STRUCT%s*$") then
         if pending_type_name then
           current_type = {
@@ -214,9 +230,11 @@ function M.extract_types(content)
             kind = "struct",
             fields = {},
             start_line = i - 1,
+            comment = pending_comment,
           }
           types[pending_type_name] = current_type
           pending_type_name = nil
+          pending_comment = nil
         end
         in_struct = true
       elseif trimmed:match("^END_STRUCT%s*$") then
@@ -226,9 +244,14 @@ function M.extract_types(content)
         if field_name then
           local after_colon = line:match(":%s*(.+)")
           local field_type = after_colon and extract_type_name(after_colon)
+          local field_comment = line:match("//%s*(.+)$")
+          if not field_comment then
+            field_comment = line:match("%(%*(.-)%*%)")
+          end
           table.insert(current_type.fields, {
             name = field_name,
             type = field_type or "unknown",
+            comment = field_comment,
           })
         end
       elseif not in_struct and not pending_type_name then

src/plc_json.lua

@@ -85,6 +85,13 @@ local function parse_scl_type_file(content)
   local current_type_name = nil
   local pending_type_name = nil
 
+  local in_fb = false
+  local fb_name = nil
+  local fb_inputs = {}
+  local fb_outputs = {}
+  local fb_inouts = {}
+  local current_fb_section = nil
+
   content = content:gsub("^([\239\187\191]+)", "")
 
   local lines = {}
@@ -93,58 +100,123 @@ local function parse_scl_type_file(content)
   for i, line in ipairs(lines) do
     local trimmed = line:gsub("^%s+", ""):gsub("%s+$", "")
 
-    if trimmed:match("^TYPE%s") or trimmed:match('^TYPE"') or trimmed == "TYPE" then
+    local fb_match = trimmed:match('^FUNCTION_BLOCK%s+"([^"]+)"') or trimmed:match("^FUNCTION_BLOCK%s+(%w+)")
-      in_type = true
+    if fb_match then
-      in_struct = false
+      in_fb = true
-      current_type_name = nil
+      fb_name = fb_match
-      pending_type_name = nil
+      fb_inputs = {}
-      local type_name = trimmed:match('TYPE%s+"([^"]+)"') or trimmed:match("^TYPE%s+(%w+)")
+      fb_outputs = {}
-      if type_name then
+      fb_inouts = {}
-        pending_type_name = type_name
+      current_fb_section = nil
+    elseif in_fb and trimmed:match("^END_FUNCTION_BLOCK") then
+      if fb_name and (#fb_inputs > 0 or #fb_outputs > 0 or #fb_inouts > 0) then
+        types[fb_name] = {
+          name = fb_name,
+          kind = "function_block",
+          inputs = fb_inputs,
+          outputs = fb_outputs,
+          inouts = fb_inouts,
+          source = "scl_file"
+        }
       end
-      in_struct = false
+      in_fb = false
-      current_type_name = nil
+      fb_name = nil
-      pending_type_name = nil
+      fb_inputs = {}
-    elseif trimmed:match("^END_TYPE") then
+      fb_outputs = {}
-      in_type = false
+      fb_inouts = {}
-      in_struct = false
+      current_fb_section = nil
-      current_type_name = nil
+    elseif in_fb then
-      pending_type_name = nil
+      if trimmed:match("^VAR_INPUT") then
-    elseif in_type then
+        current_fb_section = "input"
-      if trimmed:match("^END_STRUCT") or trimmed:match("^END_STRUCT;") then
+      elseif trimmed:match("^VAR_OUTPUT") then
+        current_fb_section = "output"
+      elseif trimmed:match("^VAR_IN_OUT") then
+        current_fb_section = "inout"
+      elseif trimmed:match("^VAR%s") or trimmed:match("^VAR%s*$") then
+        current_fb_section = nil
+      elseif trimmed:match("^VAR_TEMP") then
+        current_fb_section = nil
+      elseif trimmed:match("^END_VAR") then
+        current_fb_section = nil
+      elseif current_fb_section then
+        local field_name = line:match("^%s*(%w+)")
+        if field_name and not trimmed:match("^%(%*") then
+          local field_type = line:match(":%s*([^;]+)")
+          if field_type then
+            local attr_match = field_type:match("%{%s*[^%}]+%%s*%}%s*:%s*(.+)$")
+            if attr_match then
+              field_type = attr_match
+            end
+            field_type = field_type:gsub("%s*;.*$", "")
+            field_type = field_type:gsub("^%s+", ""):gsub("%s+$", "")
+            local field_comment = line:match("//%s*(.+)$") or line:match("%(%*(.-)%*%)")
+            local field = { name = field_name, type = field_type, comment = field_comment }
+            if current_fb_section == "input" then
+              table.insert(fb_inputs, field)
+            elseif current_fb_section == "output" then
+              table.insert(fb_outputs, field)
+            elseif current_fb_section == "inout" then
+              table.insert(fb_inouts, field)
+            end
+          end
+        end
+      end
+    end
+
+    if not in_fb then
+      if trimmed:match("^TYPE%s") or trimmed:match('^TYPE"') or trimmed == "TYPE" then
+        in_type = true
         in_struct = false
         current_type_name = nil
         pending_type_name = nil
-      elseif trimmed:match("^STRUCT") then
+        local type_name = trimmed:match('TYPE%s+"([^"]+)"') or trimmed:match("^TYPE%s+(%w+)")
-        if pending_type_name then
-          current_type_name = pending_type_name
-          in_struct = true
-          types[pending_type_name] = { name = pending_type_name, kind = "struct", fields = {}, source = "data_types_folder" }
-          pending_type_name = nil
-        end
-      elseif not in_struct and trimmed:match("^%w+%s*:") and not trimmed:match("^STRUCT") then
-        local type_name = trimmed:match("^(%w+)%s*:")
         if type_name then
-          local next_line = lines[i + 1]
+          pending_type_name = type_name
-          local next_trimmed = next_line and next_line:gsub("^%s+", ""):gsub("%s+$", "")
-          if next_trimmed and next_trimmed:match("^STRUCT") then
-            pending_type_name = type_name
-          else
-            pending_type_name = nil
-            current_type_name = nil
-            in_struct = false
-            local base_type = trimmed:match(":%s*([%w_]+)")
-            types[type_name] = { name = type_name, kind = "alias", base_type = base_type or "UNKNOWN", source = "data_types_folder" }
-          end
         end
-      elseif in_struct and current_type_name and types[current_type_name] then
+        in_struct = false
-        local field_name = line:match("^%s*(%w+)%s*:")
+        current_type_name = nil
-        if field_name and field_name ~= "END_STRUCT" then
+        pending_type_name = nil
-          local field_type = line:match(":%s*([%w_]+)")
+      elseif trimmed:match("^END_TYPE") then
-          table.insert(types[current_type_name].fields, {
+        in_type = false
-            name = field_name,
+        in_struct = false
-            type = field_type or "unknown",
+        current_type_name = nil
-          })
+        pending_type_name = nil
+      elseif in_type then
+        if trimmed:match("^END_STRUCT") or trimmed:match("^END_STRUCT;") then
+          in_struct = false
+          current_type_name = nil
+          pending_type_name = nil
+        elseif trimmed:match("^STRUCT") then
+          if pending_type_name then
+            current_type_name = pending_type_name
+            in_struct = true
+            types[pending_type_name] = { name = pending_type_name, kind = "struct", fields = {}, source = "data_types_folder" }
+            pending_type_name = nil
+          end
+        elseif not in_struct and trimmed:match("^%w+%s*:") and not trimmed:match("^STRUCT") then
+          local type_name = trimmed:match("^(%w+)%s*:")
+          if type_name then
+            local next_line = lines[i + 1]
+            local next_trimmed = next_line and next_line:gsub("^%s+", ""):gsub("%s+$", "")
+            if next_trimmed and next_trimmed:match("^STRUCT") then
+              pending_type_name = type_name
+            else
+              pending_type_name = nil
+              current_type_name = nil
+              in_struct = false
+              local base_type = trimmed:match(":%s*([%w_]+)")
+              types[type_name] = { name = type_name, kind = "alias", base_type = base_type or "UNKNOWN", source = "data_types_folder" }
+            end
+          end
+        elseif in_struct and current_type_name and types[current_type_name] then
+          local field_name = line:match("^%s*(%w+)%s*:")
+          if field_name and field_name ~= "END_STRUCT" then
+            local field_type = line:match(":%s*([%w_]+)")
+            table.insert(types[current_type_name].fields, {
+              name = field_name,
+              type = field_type or "unknown",
+            })
+          end
         end
       end
     end