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Language Server Index Format Test Utilities

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# ⚠️ This project  has been merged into [github.com/sourcegraph/sourcegraph](https://github.com/sourcegraph/sourcegraph) ⚠️

# LSIF development and testing utilities

## Install

Assumes a working Go installation:

```
# lsif-validate
go get github.com/sourcegraph/lsif-test/cmd/lsif-validate

# lsif-visualize
go get github.com/sourcegraph/lsif-test/cmd/lsif-visualize
```

Resulting binary should then be in your `$GOPATH/bin` (conventionally `$HOME/go/bin`), so make sure thats in your `$PATH` or else invoke using absolute/relative location.

Binary releases coming soon™️

## lsif-validate

This command validates the output of an LSIF indexer. The following properties are validated:

- Element IDs are unique
- All references of element occur after its definition
- A single metadata vertex exists and is the firsts element in the dump
- The project root is a valid URL
- Each document URI is a URL relative to the project root
- Each range vertex has sane bounds (non-negative line/character values and the ending position occurs strictly after the starting position)
- 1-to-n edges have a non-empty `inVs` array
- Edges refer to identifiers attached to the correct element type, as follows:

| label                     | inV(s)                     | outV                | condition |
    | ------------------------- | -------------------------- | ------------------- | --------- |
    | `contains`                | `range`                    |                     | if outV is a `document` |
    | `item`                    | `range`                    |                     | |
    | `item`                    | `referenceResult`          |                     | if outV is a `referenceResult` |
    | `next`                    | `resultSet`                | `range`/`resultSet` | |
    | `textDocument/definition` | `definitionResult`         | `range`/`resultSet` | |
    | `textDocument/references` | `referenceResult`          | `range`/`resultSet` | |
    | `textDocument/hover`      | `hoverResult`              | `range`/`resultSet` | |
    | `moniker`                 | `moniker`                  | `range`/`resultSet` | |
    | `nextMoniker`             | `moniker`                  | `moniker`           | |
    | `packageInformation`      | `packageInformation`       | `moniker`           | |

- Each vertex is reachable from a range or document vertex (*ignored: metadata, project, document, and event vertices*)
- Each range belongs to a unique document
- No two ranges belonging to the same document improperly overlap
- The inVs of each `item` edge belong to that document referred to by the edge's `document` field

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