// Copyright (c) 2019-2024 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module token

pub struct Pos {
pub:
    len      int // length of the literal in the source
    line_nr  int // the line number in the source where the token occurred
    pos      int // the position of the token in scanner text
    col      u16 // the column in the source where the token occurred
    file_idx i16 = -1 // file idx in the global table `filelist`
pub mut:
    last_line int // the line number where the ast object ends (used by vfmt)
}

@[unsafe]
pub fn (mut p Pos) free() {
}

pub fn (p Pos) line_str() string {
    return '{l: ${p.line_nr + 1:5}, c: ${p.col:3}, p: ${p.pos:5}, ll: ${p.last_line + 1:5}}'
}

pub fn (pos Pos) extend(end Pos) Pos {
    return Pos{
        ...pos
        len:       end.pos - pos.pos + end.len
        last_line: end.last_line
    }
}

pub fn (pos Pos) extend_with_last_line(end Pos, last_line int) Pos {
    return Pos{
        ...pos
        len:       end.pos - pos.pos + end.len
        last_line: last_line - 1
    }
}

pub fn (mut pos Pos) update_last_line(last_line int) {
    pos.last_line = last_line - 1
}

@[inline]
pub fn (tok &Token) pos() Pos {
    return Pos{
        file_idx:  tok.file_idx
        len:       tok.len
        line_nr:   tok.line_nr - 1
        pos:       tok.pos
        last_line: tok.line_nr - 1
        col:       tok.col - 1
    }
}