sieve-rs 0.2.1

/*
 * Copyright (c) 2020-2023, Stalwart Labs Ltd.
 *
 * This file is part of the Stalwart Sieve Interpreter.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 * in the LICENSE file at the top-level directory of this distribution.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * You can be released from the requirements of the AGPLv3 license by
 * purchasing a commercial license. Please contact licensing@stalw.art
 * for more details.
*/

use crate::{
    compiler::{
        grammar::actions::{
            action_flags::{Action, EditFlags},
            action_set::Variable,
        },
        lexer::string::StringItem,
    },
    Context,
};

impl EditFlags {
    pub(crate) fn exec(&self, ctx: &mut Context) {
        let mut var_name_ = None;
        let var_name = self.name.as_ref().unwrap_or_else(|| {
            var_name_.get_or_insert_with(|| Variable::Global("__flags".to_string()))
        });

        match &self.action {
            Action::Set => {
                let mut flags_lc = Vec::new();
                let mut flags = String::new();
                ctx.tokenize_flags(&self.flags, |flag| {
                    let flag_lc = flag.to_lowercase();
                    if !flags_lc.contains(&flag_lc) {
                        if !flags.is_empty() {
                            flags.push(' ');
                        }
                        flags.push_str(flag);
                        flags_lc.push(flag_lc);
                    }
                    false
                });
                ctx.set_variable(var_name, flags);
            }
            Action::Add => {
                let mut new_flags = ctx.get_variable(var_name).cloned().unwrap_or_default();
                let mut current_flags = new_flags
                    .split(' ')
                    .map(|f| f.to_lowercase())
                    .collect::<Vec<_>>();

                ctx.tokenize_flags(&self.flags, |flag| {
                    let flag_lc = flag.to_lowercase();
                    if !current_flags.contains(&flag_lc) {
                        if !new_flags.is_empty() {
                            new_flags.push(' ');
                        }
                        new_flags.push_str(flag);
                        current_flags.push(flag_lc);
                    }
                    false
                });
                ctx.set_variable(var_name, new_flags);
            }
            Action::Remove => {
                let mut current_flags = Vec::new();
                let mut current_flags_lc = Vec::new();

                for flag in ctx
                    .get_variable(var_name)
                    .map_or("", |f| f.as_str())
                    .split(' ')
                {
                    current_flags.push(flag);
                    current_flags_lc.push(flag.to_lowercase());
                }
                ctx.tokenize_flags(&self.flags, |flag| {
                    let flag = flag.to_lowercase();
                    if let Some(pos) = current_flags_lc.iter().position(|lflag| lflag == &flag) {
                        current_flags.swap_remove(pos);
                        current_flags_lc.swap_remove(pos);
                    }
                    false
                });
                ctx.set_variable(var_name, current_flags.join(" "));
            }
        }
    }
}

impl<'x> Context<'x> {
    pub(crate) fn tokenize_flags(
        &self,
        strings: &[StringItem],
        mut cb: impl FnMut(&str) -> bool,
    ) -> bool {
        for (pos, string) in strings.iter().enumerate() {
            let flag = self.eval_string(string);
            if !flag.is_empty() {
                if pos == 0 && strings.len() == 1 {
                    for flag in flag.split_ascii_whitespace() {
                        if !flag.is_empty() && cb(flag) {
                            return true;
                        }
                    }
                } else if cb(flag.trim()) {
                    return true;
                }
            }
        }
        false
    }

    pub(crate) fn get_local_flags(&self, strings: &[StringItem]) -> Vec<String> {
        let mut flags = Vec::new();
        self.tokenize_flags(strings, |flag| {
            flags.push(flag.to_string());
            false
        });
        flags
    }

    pub(crate) fn get_global_flags(&self) -> Vec<String> {
        match self.vars_global.get("__flags") {
            Some(flags) if !flags.is_empty() => flags
                .split(' ')
                .map(|s| s.to_string())
                .collect::<Vec<String>>(),
            _ => Vec::new(),
        }
    }

    pub(crate) fn get_local_or_global_flags(&self, strings: &[StringItem]) -> Vec<String> {
        if strings.is_empty() {
            self.get_global_flags()
        } else {
            self.get_local_flags(strings)
        }
    }
}