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# unified-latex-util-align

## What is this?

Functions to parse an analyze "align" environments like `\begin{align}...\end{align}` or
`\begin{bmatrix}...\end{bmatrix}`.

## When should I use this?

If you need to process the contents of an align environment for, e.g., pretty-printing.

## Install

```bash
npm install @unified-latex/unified-latex-util-align
```

This package contains both esm and commonjs exports. To explicitly access the esm export,
import the `.js` file. To explicitly access the commonjs export, import the `.cjs` file.

# Functions

## `createMatchers(rowSepMacros, colSep)`


```typescript
function createMatchers(
  rowSepMacros: string[],
  colSep: string[]
): {
  isRowSep: Ast.TypeGuard<Ast.Macro & { content: string }>;
  isColSep: (node: Ast.Node) => boolean;
  isWhitespace: (node: Ast.Node) => node is Ast.Whitespace;
  isSameLineComment: (node: Ast.Node) => boolean;
  isOwnLineComment: (node: Ast.Node) => boolean;
};
```

**Parameters**

| Param        | Type       |
| :----------- | :--------- |
| rowSepMacros | `string[]` |
| colSep       | `string[]` |

## `parseAlignEnvironment(ast, colSep, rowSepMacros)`

Parse the content of an align environment into an array of row objects.
Each row object looks like

     {
       cells: [...],
       colSeps: [...],
       rowSep: ...,
       trailingComment: ...
     }

`...` may be an ast node or `null`.

```typescript
function parseAlignEnvironment(
  ast: Ast.Node[],
  colSep: string[],
  rowSepMacros: string[]
): Row[];
```

**Parameters**

| Param        | Type         |
| :----------- | :----------- |
| ast          | `Ast.Node[]` |
| colSep       | `string[]`   |
| rowSepMacros | `string[]`   |