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tia-lsp/src/grammar.json
T
lazar fb55915147 feat: major grammar upgrade for SCL spec conformance (Phase 1) 
Comprehensive grammar rewrite to conform to SCL specs. Improves parse
success rate from 0% to 90% (187 of 208 reference project files).

Case-insensitive keywords:
- Add ci() helper for case-insensitive token matching
- All keywords (TYPE, STRUCT, VAR, IF, etc.) now match any case
- All type names (BOOL, Int, Dint, etc.) now match any case

New grammar constructs:
- RETURN statement
- GOTO statement
- AUTHOR/FAMILY/NAME block headers
- VAR DB_SPECIFIC section
- ARRAY[*] (variable-length arrays)
- Multidimensional ARRAY[a..b, c..d]
- REF_TO <type>
- VARIANT type
- Anonymous STRUCT...END_STRUCT as a type
- Compound assignment operators (+=, -=, *=, /=, &=, |=, ^=)
- Chained assignments (lvalue := lvalue := expression)
- Bit access (lvalue.%X0)
- Method calls (lvalue.field(...))
- Struct/array initializers ((TRUE, FALSE, ...), (name := value))
- END_STRUCT; (semicolon after END_STRUCT in UDTs)
- Typed DB associated block name (DATA_BLOCK "Name" : "UDT")
- BOM (Byte Order Mark) handling
- TITLE as single-token statement (avoids keyword/identifier conflict)

New type_builtin aliases:
- LWORD, LINT, ULINT, UDINT, DATE, TIME_OF_DAY, DATE_AND_TIME
- S5TIME, LTIME, DTL, LTOD, LDT, LTIME_OF_DAY, DATE_AND_LTIME

New literal formats:
- Binary (2#...), Octal (8#...)
- BOOL#TRUE/FALSE
- Typed integers (INT#, SINT#, DINT#, etc.)
- Date/time literals (DATE#, TOD#, DT#, LTIME#, S5TIME#, DTL#)
- WSTRING# and STRING# typed string literals
- C# char literal
- Time units with case-insensitive matching (T#1S, T#2s)

Updated constructs:
- CASE labels: comma-separated lists, string labels
- Function call parameters: interleaved input (:=) and output (=>) params
- FOR loop variable: accepts prefixed_identifier (#tempVar)
- Array bounds: accept string/identifier constants (Array[0.."MAX"])
- Author/Family values: accept unquoted text with hyphens/slashes

Known remaining issues (21 files, 10%):
- Triple-nested parentheses in expressions
- Some multi-line function call parameter patterns
- END_REGION with trailing region name
- Complex chained field access in assignments
2026-07-18 19:19:03 +02:00

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{
"$schema": "https://tree-sitter.github.io/tree-sitter/assets/schemas/grammar.schema.json",
"name": "scl",
"rules": {
"source_file": {
"type": "SEQ",
"members": [
{
"type": "CHOICE",
"members": [
{
"type": "SYMBOL",
"name": "bom"
},
{
"type": "BLANK"
}
]
},
{
"type": "REPEAT",
"content": {
"type": "CHOICE",
"members": [
{
"type": "SYMBOL",
"name": "organization_block"
},
{
"type": "SYMBOL",
"name": "function_block"
},
{
"type": "SYMBOL",
"name": "function"
},
{
"type": "SYMBOL",
"name": "type_definition"
},
{
"type": "SYMBOL",
"name": "data_block"
},
{
"type": "SYMBOL",
"name": "statement"
}
]
}
}
]
},
"title_statement": {
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"content": {
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"members": [
{
"type": "PATTERN",
"value": "[Tt][Ii][Tt][Ll][Ee]"
},
{
"type": "PATTERN",
"value": "\\s*=\\s*"
},
{
"type": "PATTERN",
"value": "[^\\n\\r]+"
}
]
}
},
"author_value": {
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"content": {
"type": "REPEAT1",
"content": {
"type": "PATTERN",
"value": "[a-zA-Z0-9_\\-\\/]"
}
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}
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"named": true,
"value": "keyword"
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{
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"name": "name",
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]
}
},
"block_comment": {
"type": "TOKEN",
"content": {
"type": "SEQ",
"members": [
{
"type": "STRING",
"value": "(*"
},
{
"type": "REPEAT",
"content": {
"type": "CHOICE",
"members": [
{
"type": "PATTERN",
"value": "[^*]"
},
{
"type": "SEQ",
"members": [
{
"type": "STRING",
"value": "*"
},
{
"type": "PATTERN",
"value": "[^)]"
}
]
}
]
}
},
{
"type": "STRING",
"value": "*)"
}
]
}
},
"c_style_comment": {
"type": "TOKEN",
"content": {
"type": "SEQ",
"members": [
{
"type": "STRING",
"value": "(/*"
},
{
"type": "REPEAT",
"content": {
"type": "CHOICE",
"members": [
{
"type": "PATTERN",
"value": "[^*]"
},
{
"type": "SEQ",
"members": [
{
"type": "STRING",
"value": "*"
},
{
"type": "PATTERN",
"value": "[^)]"
}
]
}
]
}
},
{
"type": "STRING",
"value": "*/)"
}
]
}
},
"exit_statement": {
"type": "ALIAS",
"content": {
"type": "TOKEN",
"content": {
"type": "PATTERN",
"value": "[Ee][Xx][Ii][Tt]"
}
},
"named": true,
"value": "keyword"
},
"continue_statement": {
"type": "ALIAS",
"content": {
"type": "TOKEN",
"content": {
"type": "PATTERN",
"value": "[Cc][Oo][Nn][Tt][Ii][Nn][Uu][Ee]"
}
},
"named": true,
"value": "keyword"
},
"bom": {
"type": "TOKEN",
"content": {
"type": "STRING",
"value": ""
}
}
},
"extras": [
{
"type": "PATTERN",
"value": "\\s"
},
{
"type": "SYMBOL",
"name": "line_comment"
},
{
"type": "SYMBOL",
"name": "block_comment"
},
{
"type": "SYMBOL",
"name": "c_style_comment"
}
],
"conflicts": [
[
"case_item"
],
[
"region_statement"
],
[
"case_statement"
],
[
"fb_call",
"function_call"
],
[
"fb_parameter",
"parameter"
],
[
"var_declaration",
"var_temp_declaration"
],
[
"var_declaration",
"var_constant_declaration"
],
[
"var_declaration",
"var_retain_declaration"
],
[
"var_declaration",
"var_non_retain_declaration"
],
[
"var_declaration",
"var_db_specific_declaration"
],
[
"type",
"struct_type"
],
[
"expression",
"struct_initializer"
]
],
"precedences": [],
"externals": [],
"inline": [],
"supertypes": [],
"reserved": {}
}
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