lsp-max-ast 26.7.3

AST layer for lsp-max via tree-sitter
Documentation 
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/*
This file is part of auto-lsp.
Copyright (C) 2025 CLAUZEL Adrien

auto-lsp is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>
*/

use lsp_types_max::{Range, SemanticToken, SemanticTokens};

/// Semantic tokens builder
///
/// Tokens are encoded relative to each other.
///
/// This is taken from rust-analyzer which is also a direct port of <https://github.com/microsoft/vscode-languageserver-node/blob/f425af9de46a0187adb78ec8a46b9b2ce80c5412/server/src/sematicTokens.proposed.ts#L45>
pub struct SemanticTokensBuilder {
    id: String,
    prev_line: u32,
    prev_char: u32,
    data: Vec<SemanticToken>,
}

impl SemanticTokensBuilder {
    pub fn new(id: String) -> Self {
        SemanticTokensBuilder {
            id,
            prev_line: 0,
            prev_char: 0,
            data: Default::default(),
        }
    }

    /// Push a new token onto the builder
    pub fn push(&mut self, range: Range, token_index: u32, modifier_bitset: u32) {
        let mut push_line = range.start.line;
        let mut push_char = range.start.character;

        if !self.data.is_empty() {
            push_line -= self.prev_line;
            if push_line == 0 {
                push_char -= self.prev_char;
            }
        }

        // A token cannot be multiline
        let token_len = range.end.character - range.start.character;

        let token = SemanticToken {
            delta_line: push_line,
            delta_start: push_char,
            length: token_len,
            token_type: token_index,
            token_modifiers_bitset: modifier_bitset,
        };

        self.data.push(token);

        self.prev_line = range.start.line;
        self.prev_char = range.start.character;
    }

    pub fn build(self) -> SemanticTokens {
        SemanticTokens {
            result_id: Some(self.id),
            data: self.data,
        }
    }
}