ast.h File Reference

AST node creation and destruction prototypes. More...

#include "structs.h"

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Detailed Description

AST node creation and destruction prototypes.

Definition in file ast.h.

Functions
t_ast *	create_cmd_node (char **args, int argc)
	Create a NODE_COMMAND AST node. More...
t_ast *	create_pipe_node (t_ast *left, t_ast *right)
	Create a pipe AST node connecting 2 subtrees. More...
t_ast *	create_redir_node (t_node_type type, char *file, t_ast *cmd, int quote)
	Create a redirection AST node. More...
void	free_ast (t_ast *node)
	Recursively free an entire AST tree. More...

Function Documentation

create_cmd_node()

t_ast* create_cmd_node	(	char **	args,
		int	argc
	)

Create a NODE_COMMAND AST node.

Parameters

args	Argument array (NULL terminated)
argc	Argument count

Returns

New command node or NULL on failure

Definition at line 23 of file ast.c.

References t_cmd_node::argc, t_cmd_node::args, t_ast_data::cmd, t_ast::data, NODE_COMMAND, and t_ast::type.

Referenced by parse_simple_command().

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create_pipe_node()

t_ast* create_pipe_node	(	t_ast *	left,
		t_ast *	right
	)

Create a pipe AST node connecting 2 subtrees.

Parameters

left	Left child (command before the pipe)
right	Right child (command after the pipe)

Returns

New pipe node or NULL on failure

Definition at line 43 of file ast.c.

References t_ast_data::binary, t_ast::data, free_ast(), t_binary_node::left, NODE_PIPE, t_binary_node::right, and t_ast::type.

Referenced by parse_pipeline().

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create_redir_node()

t_ast* create_redir_node	(	t_node_type	type,
		char *	file,
		t_ast *	cmd,
		int	quoted
	)

Create a redirection AST node.

Initializes heredoc_fd to -1 (not used)

Parameters

type	Redirection type
file	Filename or heredoc delimiter
cmd	Command subtree that this redirection wraps
quoted	1 if heredoc delimiter was quoted

Returns

New redirection node or NULL on failure

Definition at line 71 of file ast.c.

References t_redir_node::cmd, t_ast::data, t_redir_node::file, t_redir_node::heredoc_fd, t_redir_node::quote, t_ast_data::redir, t_redir_node::redir_type, and t_ast::type.

Referenced by parse_one_redirection().

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free_ast()

void free_ast

(

t_ast *

node

)

Recursively free an entire AST tree.

• NODE_COMMAND: frees the args array
• NODE_PIPE: recurses into left and right children
• NODE_REDIR: closes heredoc_fd if >= 0, frees the filename and recurses into the command subtree

Parameters

node	Root of tree to free

Definition at line 46 of file ast_utils.c.

References t_cmd_node::args, t_ast_data::binary, t_redir_node::cmd, t_ast_data::cmd, t_ast::data, t_redir_node::file, free_args(), t_redir_node::heredoc_fd, t_binary_node::left, NODE_COMMAND, NODE_PIPE, NODE_REDIR_HEREDOC, NODE_REDIR_IN, t_ast_data::redir, t_binary_node::right, and t_ast::type.

Referenced by child_execute(), create_pipe_node(), exec_left_pipe_child(), exec_right_pipe_child(), parse_one_redirection(), parse_pipeline(), process_input(), and process_ui_input().

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