1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139

// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// Code for creating styled buffers

use snippet::{Style, StyledString};

#[derive(Debug)]
pub struct StyledBuffer {
    text: Vec<Vec<char>>,
    styles: Vec<Vec<Style>>,
}

impl StyledBuffer {
    pub fn new() -> StyledBuffer {
        StyledBuffer {
            text: vec![],
            styles: vec![],
        }
    }

    pub fn copy_tabs(&mut self, row: usize) {
        if row < self.text.len() {
            for i in row + 1..self.text.len() {
                for j in 0..self.text[i].len() {
                    if self.text[row].len() > j && self.text[row][j] == '\t' &&
                       self.text[i][j] == ' ' {
                        self.text[i][j] = '\t';
                    }
                }
            }
        }
    }

    pub fn render(&mut self) -> Vec<Vec<StyledString>> {
        let mut output: Vec<Vec<StyledString>> = vec![];
        let mut styled_vec: Vec<StyledString> = vec![];

        // before we render, do a little patch-up work to support tabs
        self.copy_tabs(3);

        for (row, row_style) in self.text.iter().zip(&self.styles) {
            let mut current_style = Style::NoStyle;
            let mut current_text = String::new();

            for (&c, &s) in row.iter().zip(row_style) {
                if s != current_style {
                    if !current_text.is_empty() {
                        styled_vec.push(StyledString {
                            text: current_text,
                            style: current_style,
                        });
                    }
                    current_style = s;
                    current_text = String::new();
                }
                current_text.push(c);
            }
            if !current_text.is_empty() {
                styled_vec.push(StyledString {
                    text: current_text,
                    style: current_style,
                });
            }

            // We're done with the row, push and keep going
            output.push(styled_vec);

            styled_vec = vec![];
        }

        output
    }

    fn ensure_lines(&mut self, line: usize) {
        while line >= self.text.len() {
            self.text.push(vec![]);
            self.styles.push(vec![]);
        }
    }

    pub fn putc(&mut self, line: usize, col: usize, chr: char, style: Style) {
        self.ensure_lines(line);
        if col < self.text[line].len() {
            self.text[line][col] = chr;
            self.styles[line][col] = style;
        } else {
            let mut i = self.text[line].len();
            while i < col {
                self.text[line].push(' ');
                self.styles[line].push(Style::NoStyle);
                i += 1;
            }
            self.text[line].push(chr);
            self.styles[line].push(style);
        }
    }

    pub fn puts(&mut self, line: usize, col: usize, string: &str, style: Style) {
        let mut n = col;
        for c in string.chars() {
            self.putc(line, n, c, style);
            n += 1;
        }
    }

    pub fn prepend(&mut self, line: usize, string: &str, style: Style) {
        self.ensure_lines(line);
        let string_len = string.len();

        // Push the old content over to make room for new content
        for _ in 0..string_len {
            self.styles[line].insert(0, Style::NoStyle);
            self.text[line].insert(0, ' ');
        }

        self.puts(line, 0, string, style);
    }

    pub fn append(&mut self, line: usize, string: &str, style: Style) {
        if line >= self.text.len() {
            self.puts(line, 0, string, style);
        } else {
            let col = self.text[line].len();
            self.puts(line, col, string, style);
        }
    }

    pub fn num_lines(&self) -> usize {
        self.text.len()
    }
}