InputLayer IQL - VS Code Extension

Syntax highlighting for InputLayer (.iql) files.

Features

• Semantic syntax highlighting with head/body distinction in rules
• Schema column names highlighted differently from relation names
• <- renders as ← arrow with ligature fonts (Fira Code, JetBrains Mono, Cascadia Code)
• Line (//) and block (/* */) comment support with nesting
• Comment toggling with Cmd+/ / Ctrl+/
• Bracket matching, auto-closing pairs, bracket pair colorization
• File associations: .iql

Semantic highlighting

Rules distinguish head (definition) from body (references):

+triangle(A, B, C) <- edge(A, B), edge(B, C), edge(C, A)
│         │            │    │
│         │            │    └─ Variable (light blue)
│         │            └────── Body relation (teal/green - distinct from head)
│         └─────────────────── Variable (light blue)
└───────────────────────────── Head relation (yellow - definition)

Schema declarations distinguish column names from relation names:

+employee(emp_id: int, name: string, embedding: vector)
│         │       │
│         │       └─ Type (blue - keyword color)
│         └───────── Column name (member color - distinct from relation)
└─────────────────── Relation name (yellow - head)

Arrow ligature

The extension enables font ligatures for .iql files. With a ligature font, <- displays as ←:

Recommended fonts: Fira Code, JetBrains Mono, Cascadia Code, Iosevka

All highlighted constructs

Construct	Examples	Scope
Comments	// ..., /* ... */	comment
Strings	"hello"	string
Meta commands	.kg create, .rule list	keyword.control
Query marker	?relation(X)	keyword.control
Rule arrow	<-	keyword.control
Mutation prefix	+fact(...), -fact(...)	keyword.control
Negation	!relation(X)	keyword.control
Comparison ops	=, !=, <, >, <=, >=	keyword.operator
Numbers	42, 3.14, 1.5e-3	constant.numeric
Aggregates	count, sum, avg, min, max, top_k	support.function
Built-in functions	euclidean, cosine, abs, concat	support.function
Type keywords	type, int, string, bool, float, list	storage.type
Booleans	true, false	constant.language
Schema types	vector, timestamp, embedding, symbol, any	storage.type
Sort order	:desc, :asc	keyword.other
Variables	X, Y, _Tmp	variable.parameter
Wildcard	_	variable.language
Head relations	path(X, Y) <- ...	entity.name.function
Body relations	... <- edge(X, Y)	entity.name.tag
Column names	name: string	variable.other.member

Installation

Manual install

cp -r packages/inputlayer-vscode ~/.vscode/extensions/inputlayer-iql-0.1.0

Then quit and reopen VS Code.

Development mode

code --extensionDevelopmentPath=$(pwd)/packages/inputlayer-vscode

Development

The TextMate grammar (syntaxes/iql.tmLanguage.json) is derived from:

• PEG tokenizer: src/syntax/iql.pest (token definitions)
• Schema types: src/schema/mod.rs (SchemaType::from_str)
• Built-in functions: src/vector_ops.rs

When adding new syntax constructs, update the TextMate grammar to match.