parser_redir.c File Reference

Redirection parsing: parses <, >, >>, << tokens & files. More...

#include "parser.h"
#include "ast.h"
#include "libft.h"

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Detailed Description

Redirection parsing: parses <, >, >>, << tokens & files.

Definition in file parser_redir.c.

Functions
static t_node_type	get_redir_node_type (t_token_type type)
	Convert a token type to the corresponding AST redirection node type. More...
static t_ast *	parse_one_redirection (t_token **tokens, t_ast *cmd)
	Parse a single redirection token and the following WORD (filename) More...
static void	collect_and_merge_remaining_args (t_ast *cmd, t_token **tokens)
	Collect trailing WORD tokens and merge them into a command's args. More...
static t_ast *	get_command_node (t_ast *node)
	Extract the innermost command from a redirection chain. More...
t_ast *	parse_command (t_token **tokens)
	Parse a command with all its redirections. More...

Function Documentation

get_redir_node_type()

static t_node_type get_redir_node_type ( t_token_type  type )

static

Convert a token type to the corresponding AST redirection node type.

Parameters

type	Token type

Returns

NODE_REDIR_... type or NODE_COMMAND (fallback)

Definition at line 23 of file parser_redir.c.

References NODE_COMMAND, NODE_REDIR_APPEND, NODE_REDIR_HEREDOC, NODE_REDIR_IN, NODE_REDIR_OUT, TOKEN_APPEND, TOKEN_HEREDOC, TOKEN_REDIR_IN, and TOKEN_REDIR_OUT.

Referenced by parse_one_redirection().

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parse_one_redirection()

static t_ast* parse_one_redirection ( t_token **  tokens, t_ast *  cmd  )

static

Parse a single redirection token and the following WORD (filename)

Parameters

tokens	Pointer to current token pointer (advanced)
cmd	Command to wrap

Returns

Redirection node or NULL on error

Warning

cmd is freed on failure (do not use after NULL return)

Definition at line 44 of file parser_redir.c.

References create_redir_node(), free_ast(), get_redir_node_type(), join_connected_delim(), t_token::next, TOKEN_WORD, and t_token::type.

Referenced by parse_command().

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collect_and_merge_remaining_args()

static void collect_and_merge_remaining_args ( t_ast *  cmd, t_token **  tokens  )

static

Collect trailing WORD tokens and merge them into a command's args.

Handles cases such as "cmd arg1 > out arg2" as it collects new_args, allocates a merged array and copies old + new args, then updates cmd->data.cmd.args and argc

Parameters

cmd	Command node to extend
tokens	Pointer to current token pointer

Definition at line 80 of file parser_redir.c.

References t_cmd_node::argc, t_cmd_node::args, t_ast_data::cmd, collect_args(), and t_ast::data.

Referenced by parse_command().

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get_command_node()

static t_ast* get_command_node ( t_ast *  node )

static

Extract the innermost command from a redirection chain.

Parameters

node	Starting node of the chain

Returns

Innermost non redirection node or NULL

Definition at line 115 of file parser_redir.c.

References t_redir_node::cmd, t_ast::data, NODE_REDIR_HEREDOC, NODE_REDIR_IN, t_ast_data::redir, and t_ast::type.

Referenced by parse_command().

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parse_command()

t_ast* parse_command

(

t_token **

tokens

)

Parse a command with all its redirections.

Parses a simple command and wraps it in redirection nodes as long as redirection tokens follow. After each redirection it collects any trailing word tokens and adds them to the command's args

Parameters

tokens

Pointer to current token pointer (advanced)

Returns

Command AST or NULL on error

Note

It reverses the redirection chain for left to right execution

Definition at line 134 of file parser_redir.c.

References collect_and_merge_remaining_args(), get_command_node(), is_redirection(), parse_one_redirection(), parse_simple_command(), and reverse_redir_chain().

Referenced by parse_pipeline().

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