Add in styled_buffer.rs and remove some unused code

1 files changed, 133 insertions, 0 deletions

diff --git a/src/librustc_errors/styled_buffer.rs b/src/librustc_errors/styled_buffer.rs
new file mode 100644
index 00000000000..238caf93b83
--- /dev/null
+++ b/src/librustc_errors/styled_buffer.rs
@@ -0,0 +1,133 @@
+// 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 render(&self) -> Vec<Vec<StyledString>> {
+        let mut output: Vec<Vec<StyledString>> = vec![];
+        let mut styled_vec: Vec<StyledString> = vec![];
+
+        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 {
+                let s = match self.text[0].get(i) {
+                    Some(&'\t') => '\t',
+                    _ => ' ',
+                };
+                self.text[line].push(s);
+                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 set_style(&mut self, line: usize, col: usize, style: Style) {
+        if self.styles.len() > line && self.styles[line].len() > col {
+            self.styles[line][col] = style;
+        }
+    }
+
+    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()
+    }
+}