### Installing bash-parser using npm (Bash)

Source: https://github.com/vorpaljs/bash-parser/blob/master/readme.md

This snippet demonstrates how to install the `bash-parser` library as a dependency in a Node.js project using the npm package manager. It saves the package to the `package.json` file, making it available for use in your project.

```bash
npm install --save bash-parser
```

--------------------------------

### Example AST Structure from bash-parser (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/readme.md

This snippet illustrates the detailed structure of the Abstract Syntax Tree (AST) generated by `bash-parser` for the input `echo ciao`. It shows a root `Script` type containing a `SimpleCommand` with a `name` (echo) and a `suffix` (ciao), both represented as `Word` types, demonstrating the hierarchical representation of the parsed command.

```js
{
		type: "Script",
		commands: [
			{
				type: "SimpleCommand",
				name: {
					text: "echo",
					type: "Word"
				},
				suffix: [
					{
						text: "ciao",
						type: "Word"
					}
				]
			}
		]
	}
```

--------------------------------

### Representing AST Node Location in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet illustrates the `loc` property available on AST nodes when the `insertLOC` option is enabled during parsing. It provides detailed start and end positions (row, column, and character index) within the source string, useful for debugging or source mapping.

```JavaScript
{
	type: 'WORD',
	value: 'ls',
	loc: {
		start: {
			row: Number,
			col: Number,
			char: 42
		},
		end: {
			row: Number,
			col: Number,
			char: 43
		}
	}
}
```

--------------------------------

### Defining ParameterExpansion AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents a parameter expansion operation within a `Word` node. The `op` and `word` properties describe the operator and the right-hand side `Word` for special parameters. `loc` properties indicate the start and end character indices of the substitution within the parent `Word`'s text. It includes properties for its type, the `parameter` string, optional `kind`, `word`, and `op` strings, and `loc` for position.

```js
{ type: 'ParameterExpansion',
	parameter: string,
	kind: ?string,
	word: ?string,
	op: ?string,
	loc: {
		start:Number,
		end:Number
	}
}
```

--------------------------------

### Defining CommandExpansion AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents a command substitution operation within a `Word` node. The `command` string is recursively parsed by `bash-parser` itself, and `commandAST` holds the resulting AST. `loc` properties indicate the start and end character indices of the substitution within the parent `Word`'s text. It includes properties for its type, the `command` string, a `resolved` boolean, the `commandAST` object, and `loc` for position.

```js
{ type: 'CommandExpansion',
	command: string,
	resolved: boolean,
	commandAST: Object,

	loc: {
		start:Number,
		end:Number
	}
}
```

--------------------------------

### Defining ArithmeticExpansion AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents an arithmetic expansion operation within a `Word` node. The `expression` is parsed using Babel parser, and `arithmeticAST` holds the resulting AST. `loc` properties indicate the start and end character indices of the substitution within the parent `Word`'s text. It includes properties for its type, the `expression` string, a `resolved` boolean, the `arithmeticAST` object, and `loc` for position.

```js
{ type: 'ArithmeticExpansion',
	expression: string,
	resolved: boolean,
	arithmeticAST: Object,
	loc: {
		start:Number,
		end:Number
	}
}
```

--------------------------------

### Defining the Name AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `Name` AST node, used to represent identifiers such as function names or `for` loop variable names. The `text` property holds the string value of the name, which must be alphanumeric or contain underscores and cannot start with a digit.

```JavaScript
{
	type: 'Name',
	text: string
}
```

--------------------------------

### Parsing a Bash Command with bash-parser (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/readme.md

This JavaScript snippet shows how to import the `bash-parser` library and use its `parse` function to convert a simple bash command string, 'echo ciao', into an Abstract Syntax Tree (AST). The `ast` variable will hold the resulting AST object, which can then be traversed or analyzed.

```js
  const parse = require('bash-parser');
  const ast = parse('echo ciao');
```

--------------------------------

### Defining CaseItem AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents a single pattern item within a `Cases` list of a `Case` statement. It defines the pattern to match against and the corresponding set of statements to execute upon a match. The node includes properties for its type, the pattern as an array of `Word` nodes, and the body as a `CompoundList`.

```js
{ type: 'CaseItem',
	pattern: Array<Word>,
	body: CompoundList
}
```

--------------------------------

### Defining the Command AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `Command` AST node, representing a builtin or external command. It includes an optional `name` (a `Word` node), `prefix` for assignments or redirections before the command, and `suffix` for arguments or redirections after the command name.

```JavaScript
{
	type: 'Command',
	name: ?Word,
	prefix: Array<AssignmentWord | Redirect>,
	suffix: Array<Word | Redirect>
}
```

--------------------------------

### Defining Redirect AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents the redirection of input or output streams for a command. This node specifies the operation (`op`), the target file (`file`) or stream, and an optional `numberIo` for the file descriptor. It includes properties for its type, the redirection operator, the target file, and the I/O number.

```js
{ type: 'Redirect',
	op: string,
	file: word,
	numberIo: Number
}
```

--------------------------------

### Defining the Mode Object Type in Flow

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/mode.md

This Flow type definition describes the `Mode` object, which encapsulates the core parsing logic. It includes properties for a `tokenizer` function, an array of `lexerPhases`, a `phaseCatalog` for named phase access, a compiled `grammar`, the `grammarSource` in JSON format, and an `astBuilder` for constructing the Abstract Syntax Tree. This object is returned by the `ModePlugin`'s `init` function.

```Flow
export type Mode = {
	tokenizer: (options: Object, utils: Object) => (code: String) => Iterable<Token>,
	lexerPhases: Array<LexerPhase>,
	phaseCatalog: {[id:string]: LexerPhase}
	grammar: Object,
	grammarSource: Object,
	astBuilder: Object,
};
```

--------------------------------

### Defining the Pipeline AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `Pipeline` AST node, representing a sequence of commands connected by pipe operators. The `commands` array holds the individual command nodes that are executed in parallel, with the output of one becoming the input of the next.

```JavaScript
{
	type: 'Pipeline',
	commands: Array<Command |
					Function |
					Subshell |
					For |
					Case |
					If |
					While |
					Until>
}
```

--------------------------------

### Defining the Script AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `Script` AST node, which serves as the root of the Abstract Syntax Tree. It contains an array of `commands`, representing the top-level executable units within a Bash script, including logical expressions, pipelines, and control flow statements.

```JavaScript
{
	type: 'Script',
	commands: Array<LogicalExpression |
					Pipeline |
					Command |
					Function |
					Subshell |
					For |
					Case |
					if |
					While |
					Until>
}
```

--------------------------------

### Defining Word AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents a `Word` node, a fundamental lexical unit in the AST. It consists of a series of characters and is subject to various shell expansions like tilde, parameter, command, arithmetic, pathname, field splitting, and quote removal. It includes properties for its type, the raw `text`, and an array of potential `expansion` nodes.

```js
{ type: 'Word',
	text: String,
	expansion: Array<ArithmeticExpansion |
					 CommandExpansion |
					 ParameterExpansion>
}
```

--------------------------------

### Defining the ModePlugin Type in Flow

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/mode.md

This Flow type definition outlines the structure of a `ModePlugin` object. It specifies an optional `inherits` property for mode inheritance and a required `init` factory function that receives a `parentMode` and returns a `Mode` object. This plugin is used to define different shell parsing behaviors.

```Flow
type ModePlugin = {
	inherits?: string,
	init: (parentMode: Mode) => Mode
};
```

--------------------------------

### Defining LexerPhase and Token Types in Flow

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/mode.md

These Flow type definitions specify the `Token` and `LexerPhase` types. A `LexerPhase` is a higher-order function that transforms an iterable of `Token` objects. It accepts parser options, an array of preceding phases, and a `utils` object, returning a function that takes an input token iterable and produces an output token iterable. These phases are applied sequentially to process tokens.

```Flow
export type Token = Object;

type LexerPhase = (options: Object, previousPhases: Array<LexerPhase>,utils: Object) =>
	(tokens: Iterable<Token>) => Iterable<Token>;
```

--------------------------------

### Defining the CompoundList AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `CompoundList` AST node, which groups one or more commands, often forming the body of control flow statements like `for`, `if`, or `function` definitions. It can also include an optional array of `redirections` that apply to the entire list.

```JavaScript
{
	type: 'CompoundList',
	commands: Array<LogicalExpression |
					Pipeline |
					Command |
					Function |
					Subshell |
					For |
					Case |
					If |
					While |
					Until>,
	redirections: Array<Redirect>
}
```

--------------------------------

### Defining the Case Statement AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `Case` AST node, representing a `case` conditional statement in Bash. It includes a `clause` (a `Word` node) whose value is matched against patterns, and a `cases` array containing `CaseItem` nodes, each with a pattern and a corresponding command list.

```JavaScript
{
	type: 'Case',
	clause: Word,
	cases: Array<CaseItem>
}
```

--------------------------------

### Defining the Function AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `Function` AST node, representing a Bash function definition. It includes the `name` of the function, an array of `redirections` that apply to the entire function body, and a `body` which is a `CompoundList` containing the function's commands.

```JavaScript
{
	type: 'Function',
	name: Name,
	redirections: Array<Redirect>,
	body: CompoundList
}
```

--------------------------------

### Defining the For Loop AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `For` AST node, representing a `for` loop statement in Bash. It includes the loop variable `name`, a `wordlist` of items to iterate over, and a `do` property which is a `CompoundList` containing the commands to execute for each item.

```JavaScript
 {
	type: 'For',
	name: Name,
	wordlist: Array<Word>,
	do: CompoundList
}
```

--------------------------------

### Defining While Statement AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents a `While` loop statement in the AST. This node continuously executes the `do` CompoundList as long as the `clause` CompoundList returns a zero exit status. It includes properties for the loop condition `clause` and the loop body `do`.

```js
{ type: 'While',
	clause: CompoundList,
	do: CompoundList
}
```

--------------------------------

### Defining AssignmentWord AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents a special type of `Word` node specifically for assigning a value to an environment variable. Like a regular `Word`, it contains text and can undergo various expansions. It includes properties for its type, the raw `text`, and an array of potential `expansion` nodes.

```js
{ type: 'AssignmentWord',
	text: String,
	expansion: Array<ArithmeticExpansion |
					 CommandExpansion |
					 ParameterExpansion>
}
```

--------------------------------

### Defining If Statement AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents an `If` statement in the AST. This node executes a `clause` (CompoundList) and uses its exit status to conditionally execute either the `then` CompoundList or the optional `else` CompoundList. It includes properties for the conditional `clause`, the `then` block, and the `else` block.

```js
{ type: 'If',
	clause: CompoundList,
	then: CompoundList,
	else: CompoundList
}
```

--------------------------------

### Defining the LogicalExpression AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `LogicalExpression` AST node, which represents `&&` (AND) or `||` (OR) operations between two commands. The `op` property specifies the operator, and `left` and `right` properties hold the respective command nodes, with execution of `right` depending on the success or failure of `left`.

```JavaScript
{
	type: 'LogicalExpression',
	op: string,
	left: LogicalExpression |
		  Pipeline |
		  Command |
		  Function |
		  Subshell |
		  For |
		  Case |
		  If |
		  While |
		  Until,
	right: LogicalExpression |
		   Pipeline |
		   Command |
		   Function |
		   Subshell |
		   For |
		   Case |
		   If |
		   While |
		   Until
}
```

--------------------------------

### Defining Until Statement AST Node (JavaScript)

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

Represents an `Until` loop statement in the AST. This node continuously executes the `do` CompoundList as long as the `clause` CompoundList returns a non-zero exit status. It includes properties for the loop condition `clause` and the loop body `do`.

```js
{ type: 'Until',
	clause: CompoundList,
	do: CompoundList
}
```

--------------------------------

### Defining the Subshell AST Node in JavaScript

Source: https://github.com/vorpaljs/bash-parser/blob/master/documents/ast.md

This snippet defines the `Subshell` AST node, representing a group of commands executed in a separate shell environment. The `list` property contains a `CompoundList` node, which encapsulates the commands within the subshell.

```JavaScript
{
	type: 'Subshell',
	list: CompoundList
}
```

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