Fix Molang parser treating namespaced identifiers as expressions

[Copilot]

The Molang diagnoser was throwing errors on valid resource identifiers like minecraft:geometry.full_block because the regex matched geometry. anywhere in the string, treating namespaced identifiers as Molang expressions.

Changes

• Modified regex pattern in packages/molang/src/molang/functions.ts

  • Added negative lookbehind (?<!:) to prevent matching after colons
  • Pattern now correctly distinguishes minecraft:geometry.full_block (identifier) from geometry.custom (Molang)

• Added test coverage in packages/molang/test/data/dataset-lookslike.ts

  • Tests for namespace:geometry.*, namespace:texture.*, namespace:material.* patterns

Example

// Before: Both matched as Molang
isMolang('minecraft:geometry.full_block')  // true ❌
isMolang('geometry.custom')                 // true

// After: Only valid Molang matches
isMolang('minecraft:geometry.full_block')  // false ✓
isMolang('geometry.custom')                 // true ✓

Original prompt

There are errors being thrown by the diagnoser because of invalid molang:

minecraft:geometry.full_block

However this is valid, but probally shouldn't tried to parsed or add the to list of resources used

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[DaanV2]

@copilot check that diagnoser doesn't look through the molang and tries to find out what is used / defined, we need to ensure that this doesn't skip out check of resources made

[Copilot]

@copilot check that diagnoser doesn't look through the molang and tries to find out what is used / defined, we need to ensure that this doesn't skip out check of resources made

Resource tracking is not affected by the regex fix. The system has two independent code paths:

Path 1: Molang harvesting (harvestMolang) - Uses isMolang() to parse expressions. Our fix prevents "minecraft:geometry.full_block" from being incorrectly parsed as Molang.

Path 2: Resource tracking (getUsingResources in packages/bedrock-project/src/internal/resource-pack/resources.ts) - Directly iterates over geometry/material/texture definitions and adds them to assigned WITHOUT using isMolang().

Example from entity/process.ts:

molang: harvestMolang(content, description),  // Path 1
// ...
getUsingResources(out.molang, description, doc);  // Path 2

The getUsingResources function explicitly adds ALL resource identifiers (including "minecraft:geometry.full_block") regardless of our regex change. Both paths continue to work correctly.