parser : possibilité d'afficher des variables
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parent
fa9033beea
commit
a441fc9cb3
3 changed files with 57 additions and 24 deletions
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@ -2,6 +2,7 @@ use crate::command::Command;
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use crate::exit_code::ExitCode;
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use crate::interface::get_user_input;
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use crate::parser::parse;
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use crate::variables::Variables;
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fn exit(code: &ExitCode) {
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let code = i32::from(code.get());
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@ -11,12 +12,13 @@ fn exit(code: &ExitCode) {
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pub fn run() {
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let mut current_exit_code = ExitCode::new(0);
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let mut variables = Variables::new();
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loop {
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let user_input = get_user_input();
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if user_input.is_some() {
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let mut command_sequence = parse(user_input.unwrap());
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let mut command_sequence = parse(user_input.unwrap(), &variables);
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if !command_sequence.is_empty() {
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current_exit_code = command_sequence.spawn();
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@ -1,5 +1,22 @@
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use crate::command::command_builder::CommandBuilder;
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use crate::command::command_sequence::CommandSequence;
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use crate::variables::Variables;
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fn parse_variable(characters: &mut Vec<char>, variables: &Variables) -> String {
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if characters.is_empty() {
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String::new()
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} else {
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let mut current_char = characters.pop().unwrap();
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let mut var_name = String::new();
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while !characters.is_empty() && !current_char.is_whitespace() {
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var_name.push(current_char);
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current_char = characters.pop().unwrap();
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}
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variables.get(var_name.as_str())
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}
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}
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fn parse_quote(characters: &mut Vec<char>) -> String {
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let mut quoted = String::new();
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@ -16,41 +33,49 @@ fn parse_quote(characters: &mut Vec<char>) -> String {
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quoted
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}
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fn parse_backslash(characters: &mut Vec<char>) -> Option<char> {
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fn parse_backslash(characters: &mut Vec<char>) -> String {
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let escaped_char = match characters.is_empty() {
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false => Some(characters.pop().unwrap()),
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true => None,
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false => String::from(characters.pop().unwrap()),
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true => String::new(),
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};
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escaped_char
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}
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fn parse_main(characters: &mut Vec<char>, current_arg: &mut String) -> Vec<String> {
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fn parse_main(
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characters: &mut Vec<char>,
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current_arg: &mut String,
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variables: &Variables,
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) -> Vec<String> {
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if characters.is_empty() {
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vec![]
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let mut last_arg = vec![];
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if !current_arg.is_empty() {
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last_arg.push(current_arg.clone());
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}
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last_arg
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} else {
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let current_char = characters.pop().unwrap();
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if current_char.is_whitespace() {
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if !current_arg.is_empty() {
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let mut argv: Vec<String> = vec![current_arg.clone()];
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argv.append(&mut parse_main(characters, &mut String::new()));
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argv.append(&mut parse_main(characters, &mut String::new(), variables));
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argv
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} else {
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parse_main(characters, current_arg)
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parse_main(characters, current_arg, variables)
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}
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} else if current_char == '\\' {
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let escaped_char = parse_backslash(characters);
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if escaped_char.is_some() {
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current_arg.push(escaped_char.unwrap());
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}
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parse_main(characters, current_arg)
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current_arg.push_str(parse_backslash(characters).as_str());
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parse_main(characters, current_arg, variables)
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} else if current_char == '$' {
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current_arg.push_str(parse_variable(characters, variables).as_str());
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parse_main(characters, current_arg, variables)
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} else if current_char == '\'' {
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current_arg.push_str(parse_quote(characters).as_str());
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parse_main(characters, current_arg)
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parse_main(characters, current_arg, variables)
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} else if current_char == ';' {
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let mut argv: Vec<String> = vec![];
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@ -61,17 +86,17 @@ fn parse_main(characters: &mut Vec<char>, current_arg: &mut String) -> Vec<Strin
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argv
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} else {
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current_arg.push(current_char);
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parse_main(characters, current_arg)
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parse_main(characters, current_arg, variables)
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}
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}
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}
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pub fn parse(line: String) -> CommandSequence {
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pub fn parse(line: String, variables: &Variables) -> CommandSequence {
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let mut characters: Vec<char> = line.chars().rev().collect();
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let mut command_sequence = CommandSequence::new();
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while !characters.is_empty() {
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let argv = parse_main(&mut characters, &mut String::new());
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let argv = parse_main(&mut characters, &mut String::new(), variables);
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if !argv.is_empty() {
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let command = CommandBuilder::new(argv).build();
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@ -1,12 +1,18 @@
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use std::collections::HashMap;
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use std::env;
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struct Variables {
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pub struct Variables {
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variables: HashMap<String, String>,
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}
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impl Variables {
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fn get(&self, key: &str) -> String {
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pub fn new() -> Self {
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Self {
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variables: HashMap::new(),
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}
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}
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pub fn get(&self, key: &str) -> String {
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let var_from_map = self.variables.get(key);
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let value: String;
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@ -24,7 +30,7 @@ impl Variables {
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value
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}
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fn unset(&mut self, key: &str) {
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pub fn unset(&mut self, key: &str) {
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let old_value = self.variables.remove(key);
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if old_value.is_none() {
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@ -32,12 +38,12 @@ impl Variables {
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}
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}
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fn set(&mut self, key: &str, value: &str) {
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pub fn set(&mut self, key: &str, value: &str) {
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self.variables
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.insert(String::from(key), String::from(value));
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}
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fn export(&mut self, key: &str) {
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pub fn export(&mut self, key: &str) {
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let var_to_export = self.variables.get(key);
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if var_to_export.is_some() {
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