--- /dev/null
+// 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 annotating snippets.
+
+use syntax_pos::{Span, FileMap, CharPos, LineInfo};
+use check_old_skool;
+use CodeMapper;
+use std::cmp;
+use std::rc::Rc;
+use std::mem;
+
+#[derive(Clone)]
+pub struct SnippetData {
+ codemap: Rc<CodeMapper>,
+ files: Vec<FileInfo>,
+}
+
+#[derive(Clone)]
+pub struct FileInfo {
+ file: Rc<FileMap>,
+
+ /// The "primary file", if any, gets a `-->` marker instead of
+ /// `>>>`, and has a line-number/column printed and not just a
+ /// filename. It appears first in the listing. It is known to
+ /// contain at least one primary span, though primary spans (which
+ /// are designated with `^^^`) may also occur in other files.
+ primary_span: Option<Span>,
+
+ lines: Vec<Line>,
+}
+
+#[derive(Clone, Debug)]
+struct Line {
+ line_index: usize,
+ annotations: Vec<Annotation>,
+}
+
+#[derive(Clone, Debug, PartialOrd, Ord, PartialEq, Eq)]
+struct Annotation {
+ /// Start column, 0-based indexing -- counting *characters*, not
+ /// utf-8 bytes. Note that it is important that this field goes
+ /// first, so that when we sort, we sort orderings by start
+ /// column.
+ start_col: usize,
+
+ /// End column within the line (exclusive)
+ end_col: usize,
+
+ /// Is this annotation derived from primary span
+ is_primary: bool,
+
+ /// Is this a large span minimized down to a smaller span
+ is_minimized: bool,
+
+ /// Optional label to display adjacent to the annotation.
+ label: Option<String>,
+}
+
+#[derive(Debug)]
+pub struct RenderedLine {
+ pub text: Vec<StyledString>,
+ pub kind: RenderedLineKind,
+}
+
+#[derive(Debug)]
+pub struct StyledString {
+ pub text: String,
+ pub style: Style,
+}
+
+#[derive(Debug)]
+pub struct StyledBuffer {
+ text: Vec<Vec<char>>,
+ styles: Vec<Vec<Style>>
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum Style {
+ FileNameStyle,
+ LineAndColumn,
+ LineNumber,
+ Quotation,
+ UnderlinePrimary,
+ UnderlineSecondary,
+ LabelPrimary,
+ LabelSecondary,
+ OldSkoolNoteText,
+ OldSkoolNote,
+ NoStyle,
+}
+
+#[derive(Debug, Clone)]
+pub enum RenderedLineKind {
+ PrimaryFileName,
+ OtherFileName,
+ SourceText {
+ file: Rc<FileMap>,
+ line_index: usize,
+ },
+ Annotations,
+ Elision,
+}
+
+impl SnippetData {
+ pub fn new(codemap: Rc<CodeMapper>,
+ primary_span: Option<Span>) // (*)
+ -> Self {
+ // (*) The primary span indicates the file that must appear
+ // first, and which will have a line number etc in its
+ // name. Outside of tests, this is always `Some`, but for many
+ // tests it's not relevant to test this portion of the logic,
+ // and it's tedious to pick a primary span (read: tedious to
+ // port older tests that predate the existence of a primary
+ // span).
+
+ debug!("SnippetData::new(primary_span={:?})", primary_span);
+
+ let mut data = SnippetData {
+ codemap: codemap.clone(),
+ files: vec![]
+ };
+ if let Some(primary_span) = primary_span {
+ let lo = codemap.lookup_char_pos(primary_span.lo);
+ data.files.push(
+ FileInfo {
+ file: lo.file,
+ primary_span: Some(primary_span),
+ lines: vec![],
+ });
+ }
+ data
+ }
+
+ pub fn push(&mut self, span: Span, is_primary: bool, label: Option<String>) {
+ debug!("SnippetData::push(span={:?}, is_primary={}, label={:?})",
+ span, is_primary, label);
+
+ let file_lines = match self.codemap.span_to_lines(span) {
+ Ok(file_lines) => file_lines,
+ Err(_) => {
+ // ignore unprintable spans completely.
+ return;
+ }
+ };
+
+ self.file(&file_lines.file)
+ .push_lines(&file_lines.lines, is_primary, label);
+ }
+
+ fn file(&mut self, file_map: &Rc<FileMap>) -> &mut FileInfo {
+ let index = self.files.iter().position(|f| f.file.name == file_map.name);
+ if let Some(index) = index {
+ return &mut self.files[index];
+ }
+
+ self.files.push(
+ FileInfo {
+ file: file_map.clone(),
+ lines: vec![],
+ primary_span: None,
+ });
+ self.files.last_mut().unwrap()
+ }
+
+ pub fn render_lines(&self) -> Vec<RenderedLine> {
+ debug!("SnippetData::render_lines()");
+
+ let mut rendered_lines: Vec<_> =
+ self.files.iter()
+ .flat_map(|f| f.render_file_lines(&self.codemap))
+ .collect();
+ prepend_prefixes(&mut rendered_lines);
+ trim_lines(&mut rendered_lines);
+ rendered_lines
+ }
+}
+
+pub trait StringSource {
+ fn make_string(self) -> String;
+}
+
+impl StringSource for String {
+ fn make_string(self) -> String {
+ self
+ }
+}
+
+impl StringSource for Vec<char> {
+ fn make_string(self) -> String {
+ self.into_iter().collect()
+ }
+}
+
+impl<S> From<(S, Style, RenderedLineKind)> for RenderedLine
+ where S: StringSource
+{
+ fn from((text, style, kind): (S, Style, RenderedLineKind)) -> Self {
+ RenderedLine {
+ text: vec![StyledString {
+ text: text.make_string(),
+ style: style,
+ }],
+ kind: kind,
+ }
+ }
+}
+
+impl<S1,S2> From<(S1, Style, S2, Style, RenderedLineKind)> for RenderedLine
+ where S1: StringSource, S2: StringSource
+{
+ fn from(tuple: (S1, Style, S2, Style, RenderedLineKind)) -> Self {
+ let (text1, style1, text2, style2, kind) = tuple;
+ RenderedLine {
+ text: vec![
+ StyledString {
+ text: text1.make_string(),
+ style: style1,
+ },
+ StyledString {
+ text: text2.make_string(),
+ style: style2,
+ }
+ ],
+ kind: kind,
+ }
+ }
+}
+
+impl RenderedLine {
+ fn trim_last(&mut self) {
+ if let Some(last_text) = self.text.last_mut() {
+ let len = last_text.text.trim_right().len();
+ last_text.text.truncate(len);
+ }
+ }
+}
+
+impl RenderedLineKind {
+ fn prefix(&self) -> StyledString {
+ match *self {
+ RenderedLineKind::SourceText { file: _, line_index } =>
+ StyledString {
+ text: format!("{}", line_index + 1),
+ style: Style::LineNumber,
+ },
+ RenderedLineKind::Elision =>
+ StyledString {
+ text: String::from("..."),
+ style: Style::LineNumber,
+ },
+ RenderedLineKind::PrimaryFileName |
+ RenderedLineKind::OtherFileName |
+ RenderedLineKind::Annotations =>
+ StyledString {
+ text: String::from(""),
+ style: Style::LineNumber,
+ },
+ }
+ }
+}
+
+impl StyledBuffer {
+ fn new() -> StyledBuffer {
+ StyledBuffer { text: vec![], styles: vec![] }
+ }
+
+ fn render(&self, source_kind: RenderedLineKind) -> Vec<RenderedLine> {
+ let mut output: Vec<RenderedLine> = 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 });
+ }
+
+ if output.is_empty() {
+ //We know our first output line is source and the rest are highlights and labels
+ output.push(RenderedLine { text: styled_vec, kind: source_kind.clone() });
+ } else {
+ output.push(RenderedLine { text: styled_vec, kind: RenderedLineKind::Annotations });
+ }
+ styled_vec = vec![];
+ }
+
+ output
+ }
+
+ fn putc(&mut self, line: usize, col: usize, chr: char, style: Style) {
+ while line >= self.text.len() {
+ self.text.push(vec![]);
+ self.styles.push(vec![]);
+ }
+
+ 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);
+ }
+ }
+
+ 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;
+ }
+ }
+
+ 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;
+ }
+ }
+
+ 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);
+ }
+ }
+}
+
+impl FileInfo {
+ fn push_lines(&mut self,
+ lines: &[LineInfo],
+ is_primary: bool,
+ label: Option<String>) {
+ assert!(lines.len() > 0);
+
+ // If a span covers multiple lines, we reduce it to a single
+ // point at the start of the span. This means that instead
+ // of producing output like this:
+ //
+ // ```
+ // --> foo.rs:2:1
+ // 2 |> fn conflicting_items<'grammar>(state: &LR0State<'grammar>)
+ // |> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ // 3 |> -> Set<LR0Item<'grammar>>
+ // |> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ // (and so on)
+ // ```
+ //
+ // we produce:
+ //
+ // ```
+ // --> foo.rs:2:1
+ // 2 |> fn conflicting_items<'grammar>(state: &LR0State<'grammar>)
+ // ^
+ // ```
+ //
+ // Basically, although this loses information, multi-line spans just
+ // never look good.
+
+ let (line, start_col, mut end_col, is_minimized) = if lines.len() == 1 {
+ (lines[0].line_index, lines[0].start_col, lines[0].end_col, false)
+ } else {
+ (lines[0].line_index, lines[0].start_col, CharPos(lines[0].start_col.0 + 1), true)
+ };
+
+ // Watch out for "empty spans". If we get a span like 6..6, we
+ // want to just display a `^` at 6, so convert that to
+ // 6..7. This is degenerate input, but it's best to degrade
+ // gracefully -- and the parser likes to suply a span like
+ // that for EOF, in particular.
+ if start_col == end_col {
+ end_col.0 += 1;
+ }
+
+ let index = self.ensure_source_line(line);
+ self.lines[index].push_annotation(start_col,
+ end_col,
+ is_primary,
+ is_minimized,
+ label);
+ }
+
+ /// Ensure that we have a `Line` struct corresponding to
+ /// `line_index` in the file. If we already have some other lines,
+ /// then this will add the intervening lines to ensure that we
+ /// have a complete snippet. (Note that when we finally display,
+ /// some of those lines may be elided.)
+ fn ensure_source_line(&mut self, line_index: usize) -> usize {
+ if self.lines.is_empty() {
+ self.lines.push(Line::new(line_index));
+ return 0;
+ }
+
+ // Find the range of lines we have thus far.
+ let first_line_index = self.lines.first().unwrap().line_index;
+ let last_line_index = self.lines.last().unwrap().line_index;
+ assert!(first_line_index <= last_line_index);
+
+ // If the new line is lower than all the lines we have thus
+ // far, then insert the new line and any intervening lines at
+ // the front. In a silly attempt at micro-optimization, we
+ // don't just call `insert` repeatedly, but instead make a new
+ // (empty) vector, pushing the new lines onto it, and then
+ // appending the old vector.
+ if line_index < first_line_index {
+ let lines = mem::replace(&mut self.lines, vec![]);
+ self.lines.extend(
+ (line_index .. first_line_index)
+ .map(|line| Line::new(line))
+ .chain(lines));
+ return 0;
+ }
+
+ // If the new line comes after the ones we have so far, insert
+ // lines for it.
+ if line_index > last_line_index {
+ self.lines.extend(
+ (last_line_index+1 .. line_index+1)
+ .map(|line| Line::new(line)));
+ return self.lines.len() - 1;
+ }
+
+ // Otherwise it should already exist.
+ return line_index - first_line_index;
+ }
+
+ fn render_file_lines(&self, codemap: &Rc<CodeMapper>) -> Vec<RenderedLine> {
+ let old_school = check_old_skool();
+
+ // As a first step, we elide any instance of more than one
+ // continuous unannotated line.
+
+ let mut lines_iter = self.lines.iter();
+ let mut output = vec![];
+
+ // First insert the name of the file.
+ if !old_school {
+ match self.primary_span {
+ Some(span) => {
+ let lo = codemap.lookup_char_pos(span.lo);
+ output.push(RenderedLine {
+ text: vec![StyledString {
+ text: lo.file.name.clone(),
+ style: Style::FileNameStyle,
+ }, StyledString {
+ text: format!(":{}:{}", lo.line, lo.col.0 + 1),
+ style: Style::LineAndColumn,
+ }],
+ kind: RenderedLineKind::PrimaryFileName,
+ });
+ output.push(RenderedLine {
+ text: vec![StyledString {
+ text: "".to_string(),
+ style: Style::FileNameStyle,
+ }],
+ kind: RenderedLineKind::Annotations,
+ });
+ }
+ None => {
+ output.push(RenderedLine {
+ text: vec![StyledString {
+ text: self.file.name.clone(),
+ style: Style::FileNameStyle,
+ }],
+ kind: RenderedLineKind::OtherFileName,
+ });
+ output.push(RenderedLine {
+ text: vec![StyledString {
+ text: "".to_string(),
+ style: Style::FileNameStyle,
+ }],
+ kind: RenderedLineKind::Annotations,
+ });
+ }
+ }
+ }
+
+ let mut next_line = lines_iter.next();
+ while next_line.is_some() {
+ // Consume lines with annotations.
+ while let Some(line) = next_line {
+ if line.annotations.is_empty() { break; }
+
+ let mut rendered_lines = self.render_line(line);
+ assert!(!rendered_lines.is_empty());
+ if old_school {
+ match self.primary_span {
+ Some(span) => {
+ let lo = codemap.lookup_char_pos(span.lo);
+ let hi = codemap.lookup_char_pos(span.hi);
+ //Before each secondary line in old skool-mode, print the label
+ //as an old-style note
+ if !line.annotations[0].is_primary {
+ if let Some(ann) = line.annotations[0].label.clone() {
+ output.push(RenderedLine {
+ text: vec![StyledString {
+ text: lo.file.name.clone(),
+ style: Style::FileNameStyle,
+ }, StyledString {
+ text: format!(":{}:{}: {}:{} ", lo.line, lo.col.0 + 1,
+ hi.line, hi.col.0+1),
+ style: Style::LineAndColumn,
+ }, StyledString {
+ text: format!("note: "),
+ style: Style::OldSkoolNote,
+ }, StyledString {
+ text: format!("{}", ann),
+ style: Style::OldSkoolNoteText,
+ }],
+ kind: RenderedLineKind::Annotations,
+ });
+ }
+ }
+ rendered_lines[0].text.insert(0, StyledString {
+ text: format!(":{} ", lo.line),
+ style: Style::LineAndColumn,
+ });
+ rendered_lines[0].text.insert(0, StyledString {
+ text: lo.file.name.clone(),
+ style: Style::FileNameStyle,
+ });
+ let gap_amount =
+ rendered_lines[0].text[0].text.len() +
+ rendered_lines[0].text[1].text.len();
+ assert!(rendered_lines.len() >= 2,
+ "no annotations resulted from: {:?}",
+ line);
+ for i in 1..rendered_lines.len() {
+ rendered_lines[i].text.insert(0, StyledString {
+ text: vec![" "; gap_amount].join(""),
+ style: Style::NoStyle
+ });
+ }
+ }
+ _ =>()
+ }
+ }
+ output.append(&mut rendered_lines);
+ next_line = lines_iter.next();
+ }
+
+ // Emit lines without annotations, but only if they are
+ // followed by a line with an annotation.
+ let unannotated_line = next_line;
+ let mut unannotated_lines = 0;
+ while let Some(line) = next_line {
+ if !line.annotations.is_empty() { break; }
+ unannotated_lines += 1;
+ next_line = lines_iter.next();
+ }
+ if unannotated_lines > 1 {
+ output.push(RenderedLine::from((String::new(),
+ Style::NoStyle,
+ RenderedLineKind::Elision)));
+ } else if let Some(line) = unannotated_line {
+ output.append(&mut self.render_line(line));
+ }
+ }
+
+ output
+ }
+
+ fn render_line(&self, line: &Line) -> Vec<RenderedLine> {
+ let old_school = check_old_skool();
+ let source_string = self.file.get_line(line.line_index)
+ .unwrap_or("");
+ let source_kind = RenderedLineKind::SourceText {
+ file: self.file.clone(),
+ line_index: line.line_index,
+ };
+
+ let mut styled_buffer = StyledBuffer::new();
+
+ // First create the source line we will highlight.
+ styled_buffer.append(0, &source_string, Style::Quotation);
+
+ if line.annotations.is_empty() {
+ return styled_buffer.render(source_kind);
+ }
+
+ // We want to display like this:
+ //
+ // vec.push(vec.pop().unwrap());
+ // --- ^^^ _ previous borrow ends here
+ // | |
+ // | error occurs here
+ // previous borrow of `vec` occurs here
+ //
+ // But there are some weird edge cases to be aware of:
+ //
+ // vec.push(vec.pop().unwrap());
+ // -------- - previous borrow ends here
+ // ||
+ // |this makes no sense
+ // previous borrow of `vec` occurs here
+ //
+ // For this reason, we group the lines into "highlight lines"
+ // and "annotations lines", where the highlight lines have the `~`.
+
+ //let mut highlight_line = Self::whitespace(&source_string);
+
+ // Sort the annotations by (start, end col)
+ let mut annotations = line.annotations.clone();
+ annotations.sort();
+
+ // Next, create the highlight line.
+ for annotation in &annotations {
+ if old_school {
+ for p in annotation.start_col .. annotation.end_col {
+ if p == annotation.start_col {
+ styled_buffer.putc(1, p, '^',
+ if annotation.is_primary {
+ Style::UnderlinePrimary
+ } else {
+ Style::OldSkoolNote
+ });
+ }
+ else {
+ styled_buffer.putc(1, p, '~',
+ if annotation.is_primary {
+ Style::UnderlinePrimary
+ } else {
+ Style::OldSkoolNote
+ });
+ }
+ }
+ }
+ else {
+ for p in annotation.start_col .. annotation.end_col {
+ if annotation.is_primary {
+ styled_buffer.putc(1, p, '^', Style::UnderlinePrimary);
+ if !annotation.is_minimized {
+ styled_buffer.set_style(0, p, Style::UnderlinePrimary);
+ }
+ } else {
+ styled_buffer.putc(1, p, '-', Style::UnderlineSecondary);
+ if !annotation.is_minimized {
+ styled_buffer.set_style(0, p, Style::UnderlineSecondary);
+ }
+ }
+ }
+ }
+ }
+
+ // Now we are going to write labels in. To start, we'll exclude
+ // the annotations with no labels.
+ let (labeled_annotations, unlabeled_annotations): (Vec<_>, _) =
+ annotations.into_iter()
+ .partition(|a| a.label.is_some());
+
+ // If there are no annotations that need text, we're done.
+ if labeled_annotations.is_empty() {
+ return styled_buffer.render(source_kind);
+ }
+ if old_school {
+ return styled_buffer.render(source_kind);
+ }
+
+ // Now add the text labels. We try, when possible, to stick the rightmost
+ // annotation at the end of the highlight line:
+ //
+ // vec.push(vec.pop().unwrap());
+ // --- --- - previous borrow ends here
+ //
+ // But sometimes that's not possible because one of the other
+ // annotations overlaps it. For example, from the test
+ // `span_overlap_label`, we have the following annotations
+ // (written on distinct lines for clarity):
+ //
+ // fn foo(x: u32) {
+ // --------------
+ // -
+ //
+ // In this case, we can't stick the rightmost-most label on
+ // the highlight line, or we would get:
+ //
+ // fn foo(x: u32) {
+ // -------- x_span
+ // |
+ // fn_span
+ //
+ // which is totally weird. Instead we want:
+ //
+ // fn foo(x: u32) {
+ // --------------
+ // | |
+ // | x_span
+ // fn_span
+ //
+ // which is...less weird, at least. In fact, in general, if
+ // the rightmost span overlaps with any other span, we should
+ // use the "hang below" version, so we can at least make it
+ // clear where the span *starts*.
+ let mut labeled_annotations = &labeled_annotations[..];
+ match labeled_annotations.split_last().unwrap() {
+ (last, previous) => {
+ if previous.iter()
+ .chain(&unlabeled_annotations)
+ .all(|a| !overlaps(a, last))
+ {
+ // append the label afterwards; we keep it in a separate
+ // string
+ let highlight_label: String = format!(" {}", last.label.as_ref().unwrap());
+ if last.is_primary {
+ styled_buffer.append(1, &highlight_label, Style::LabelPrimary);
+ } else {
+ styled_buffer.append(1, &highlight_label, Style::LabelSecondary);
+ }
+ labeled_annotations = previous;
+ }
+ }
+ }
+
+ // If that's the last annotation, we're done
+ if labeled_annotations.is_empty() {
+ return styled_buffer.render(source_kind);
+ }
+
+ for (index, annotation) in labeled_annotations.iter().enumerate() {
+ // Leave:
+ // - 1 extra line
+ // - One line for each thing that comes after
+ let comes_after = labeled_annotations.len() - index - 1;
+ let blank_lines = 3 + comes_after;
+
+ // For each blank line, draw a `|` at our column. The
+ // text ought to be long enough for this.
+ for index in 2..blank_lines {
+ if annotation.is_primary {
+ styled_buffer.putc(index, annotation.start_col, '|', Style::UnderlinePrimary);
+ } else {
+ styled_buffer.putc(index, annotation.start_col, '|', Style::UnderlineSecondary);
+ }
+ }
+
+ if annotation.is_primary {
+ styled_buffer.puts(blank_lines, annotation.start_col,
+ annotation.label.as_ref().unwrap(), Style::LabelPrimary);
+ } else {
+ styled_buffer.puts(blank_lines, annotation.start_col,
+ annotation.label.as_ref().unwrap(), Style::LabelSecondary);
+ }
+ }
+
+ styled_buffer.render(source_kind)
+ }
+}
+
+fn prepend_prefixes(rendered_lines: &mut [RenderedLine]) {
+ let old_school = check_old_skool();
+ if old_school {
+ return;
+ }
+
+ let prefixes: Vec<_> =
+ rendered_lines.iter()
+ .map(|rl| rl.kind.prefix())
+ .collect();
+
+ // find the max amount of spacing we need; add 1 to
+ // p.text.len() to leave space between the prefix and the
+ // source text
+ let padding_len =
+ prefixes.iter()
+ .map(|p| if p.text.len() == 0 { 0 } else { p.text.len() + 1 })
+ .max()
+ .unwrap_or(0);
+
+ // Ensure we insert at least one character of padding, so that the
+ // `-->` arrows can fit etc.
+ let padding_len = cmp::max(padding_len, 1);
+
+ for (mut prefix, line) in prefixes.into_iter().zip(rendered_lines) {
+ let extra_spaces = (prefix.text.len() .. padding_len).map(|_| ' ');
+ prefix.text.extend(extra_spaces);
+ match line.kind {
+ RenderedLineKind::Elision => {
+ line.text.insert(0, prefix);
+ }
+ RenderedLineKind::PrimaryFileName => {
+ // --> filename
+ // 22 |>
+ // ^
+ // padding_len
+ let dashes = (0..padding_len - 1).map(|_| ' ')
+ .chain(Some('-'))
+ .chain(Some('-'))
+ .chain(Some('>'))
+ .chain(Some(' '));
+ line.text.insert(0, StyledString {text: dashes.collect(),
+ style: Style::LineNumber})
+ }
+ RenderedLineKind::OtherFileName => {
+ // ::: filename
+ // 22 |>
+ // ^
+ // padding_len
+ let dashes = (0..padding_len - 1).map(|_| ' ')
+ .chain(Some(':'))
+ .chain(Some(':'))
+ .chain(Some(':'))
+ .chain(Some(' '));
+ line.text.insert(0, StyledString {text: dashes.collect(),
+ style: Style::LineNumber})
+ }
+ _ => {
+ line.text.insert(0, prefix);
+ line.text.insert(1, StyledString {text: String::from("|> "),
+ style: Style::LineNumber})
+ }
+ }
+ }
+}
+
+fn trim_lines(rendered_lines: &mut [RenderedLine]) {
+ for line in rendered_lines {
+ while !line.text.is_empty() {
+ line.trim_last();
+ if line.text.last().unwrap().text.is_empty() {
+ line.text.pop();
+ } else {
+ break;
+ }
+ }
+ }
+}
+
+impl Line {
+ fn new(line_index: usize) -> Line {
+ Line {
+ line_index: line_index,
+ annotations: vec![]
+ }
+ }
+
+ fn push_annotation(&mut self,
+ start: CharPos,
+ end: CharPos,
+ is_primary: bool,
+ is_minimized: bool,
+ label: Option<String>) {
+ self.annotations.push(Annotation {
+ start_col: start.0,
+ end_col: end.0,
+ is_primary: is_primary,
+ is_minimized: is_minimized,
+ label: label,
+ });
+ }
+}
+
+fn overlaps(a1: &Annotation,
+ a2: &Annotation)
+ -> bool
+{
+ (a2.start_col .. a2.end_col).contains(a1.start_col) ||
+ (a1.start_col .. a1.end_col).contains(a2.start_col)
+}
+++ /dev/null
-// 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 annotating snippets.
-
-use syntax_pos::{Span, FileMap, CharPos, LineInfo};
-use check_old_skool;
-use CodeMapper;
-use std::cmp;
-use std::rc::Rc;
-use std::mem;
-
-#[derive(Clone)]
-pub struct SnippetData {
- codemap: Rc<CodeMapper>,
- files: Vec<FileInfo>,
-}
-
-#[derive(Clone)]
-pub struct FileInfo {
- file: Rc<FileMap>,
-
- /// The "primary file", if any, gets a `-->` marker instead of
- /// `>>>`, and has a line-number/column printed and not just a
- /// filename. It appears first in the listing. It is known to
- /// contain at least one primary span, though primary spans (which
- /// are designated with `^^^`) may also occur in other files.
- primary_span: Option<Span>,
-
- lines: Vec<Line>,
-}
-
-#[derive(Clone, Debug)]
-struct Line {
- line_index: usize,
- annotations: Vec<Annotation>,
-}
-
-#[derive(Clone, Debug, PartialOrd, Ord, PartialEq, Eq)]
-struct Annotation {
- /// Start column, 0-based indexing -- counting *characters*, not
- /// utf-8 bytes. Note that it is important that this field goes
- /// first, so that when we sort, we sort orderings by start
- /// column.
- start_col: usize,
-
- /// End column within the line (exclusive)
- end_col: usize,
-
- /// Is this annotation derived from primary span
- is_primary: bool,
-
- /// Is this a large span minimized down to a smaller span
- is_minimized: bool,
-
- /// Optional label to display adjacent to the annotation.
- label: Option<String>,
-}
-
-#[derive(Debug)]
-pub struct RenderedLine {
- pub text: Vec<StyledString>,
- pub kind: RenderedLineKind,
-}
-
-#[derive(Debug)]
-pub struct StyledString {
- pub text: String,
- pub style: Style,
-}
-
-#[derive(Debug)]
-pub struct StyledBuffer {
- text: Vec<Vec<char>>,
- styles: Vec<Vec<Style>>
-}
-
-#[derive(Copy, Clone, Debug, PartialEq)]
-pub enum Style {
- FileNameStyle,
- LineAndColumn,
- LineNumber,
- Quotation,
- UnderlinePrimary,
- UnderlineSecondary,
- LabelPrimary,
- LabelSecondary,
- OldSkoolNoteText,
- OldSkoolNote,
- NoStyle,
-}
-
-#[derive(Debug, Clone)]
-pub enum RenderedLineKind {
- PrimaryFileName,
- OtherFileName,
- SourceText {
- file: Rc<FileMap>,
- line_index: usize,
- },
- Annotations,
- Elision,
-}
-
-impl SnippetData {
- pub fn new(codemap: Rc<CodeMapper>,
- primary_span: Option<Span>) // (*)
- -> Self {
- // (*) The primary span indicates the file that must appear
- // first, and which will have a line number etc in its
- // name. Outside of tests, this is always `Some`, but for many
- // tests it's not relevant to test this portion of the logic,
- // and it's tedious to pick a primary span (read: tedious to
- // port older tests that predate the existence of a primary
- // span).
-
- debug!("SnippetData::new(primary_span={:?})", primary_span);
-
- let mut data = SnippetData {
- codemap: codemap.clone(),
- files: vec![]
- };
- if let Some(primary_span) = primary_span {
- let lo = codemap.lookup_char_pos(primary_span.lo);
- data.files.push(
- FileInfo {
- file: lo.file,
- primary_span: Some(primary_span),
- lines: vec![],
- });
- }
- data
- }
-
- pub fn push(&mut self, span: Span, is_primary: bool, label: Option<String>) {
- debug!("SnippetData::push(span={:?}, is_primary={}, label={:?})",
- span, is_primary, label);
-
- let file_lines = match self.codemap.span_to_lines(span) {
- Ok(file_lines) => file_lines,
- Err(_) => {
- // ignore unprintable spans completely.
- return;
- }
- };
-
- self.file(&file_lines.file)
- .push_lines(&file_lines.lines, is_primary, label);
- }
-
- fn file(&mut self, file_map: &Rc<FileMap>) -> &mut FileInfo {
- let index = self.files.iter().position(|f| f.file.name == file_map.name);
- if let Some(index) = index {
- return &mut self.files[index];
- }
-
- self.files.push(
- FileInfo {
- file: file_map.clone(),
- lines: vec![],
- primary_span: None,
- });
- self.files.last_mut().unwrap()
- }
-
- pub fn render_lines(&self) -> Vec<RenderedLine> {
- debug!("SnippetData::render_lines()");
-
- let mut rendered_lines: Vec<_> =
- self.files.iter()
- .flat_map(|f| f.render_file_lines(&self.codemap))
- .collect();
- prepend_prefixes(&mut rendered_lines);
- trim_lines(&mut rendered_lines);
- rendered_lines
- }
-}
-
-pub trait StringSource {
- fn make_string(self) -> String;
-}
-
-impl StringSource for String {
- fn make_string(self) -> String {
- self
- }
-}
-
-impl StringSource for Vec<char> {
- fn make_string(self) -> String {
- self.into_iter().collect()
- }
-}
-
-impl<S> From<(S, Style, RenderedLineKind)> for RenderedLine
- where S: StringSource
-{
- fn from((text, style, kind): (S, Style, RenderedLineKind)) -> Self {
- RenderedLine {
- text: vec![StyledString {
- text: text.make_string(),
- style: style,
- }],
- kind: kind,
- }
- }
-}
-
-impl<S1,S2> From<(S1, Style, S2, Style, RenderedLineKind)> for RenderedLine
- where S1: StringSource, S2: StringSource
-{
- fn from(tuple: (S1, Style, S2, Style, RenderedLineKind)) -> Self {
- let (text1, style1, text2, style2, kind) = tuple;
- RenderedLine {
- text: vec![
- StyledString {
- text: text1.make_string(),
- style: style1,
- },
- StyledString {
- text: text2.make_string(),
- style: style2,
- }
- ],
- kind: kind,
- }
- }
-}
-
-impl RenderedLine {
- fn trim_last(&mut self) {
- if let Some(last_text) = self.text.last_mut() {
- let len = last_text.text.trim_right().len();
- last_text.text.truncate(len);
- }
- }
-}
-
-impl RenderedLineKind {
- fn prefix(&self) -> StyledString {
- match *self {
- RenderedLineKind::SourceText { file: _, line_index } =>
- StyledString {
- text: format!("{}", line_index + 1),
- style: Style::LineNumber,
- },
- RenderedLineKind::Elision =>
- StyledString {
- text: String::from("..."),
- style: Style::LineNumber,
- },
- RenderedLineKind::PrimaryFileName |
- RenderedLineKind::OtherFileName |
- RenderedLineKind::Annotations =>
- StyledString {
- text: String::from(""),
- style: Style::LineNumber,
- },
- }
- }
-}
-
-impl StyledBuffer {
- fn new() -> StyledBuffer {
- StyledBuffer { text: vec![], styles: vec![] }
- }
-
- fn render(&self, source_kind: RenderedLineKind) -> Vec<RenderedLine> {
- let mut output: Vec<RenderedLine> = 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 });
- }
-
- if output.is_empty() {
- //We know our first output line is source and the rest are highlights and labels
- output.push(RenderedLine { text: styled_vec, kind: source_kind.clone() });
- } else {
- output.push(RenderedLine { text: styled_vec, kind: RenderedLineKind::Annotations });
- }
- styled_vec = vec![];
- }
-
- output
- }
-
- fn putc(&mut self, line: usize, col: usize, chr: char, style: Style) {
- while line >= self.text.len() {
- self.text.push(vec![]);
- self.styles.push(vec![]);
- }
-
- 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);
- }
- }
-
- 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;
- }
- }
-
- 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;
- }
- }
-
- 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);
- }
- }
-}
-
-impl FileInfo {
- fn push_lines(&mut self,
- lines: &[LineInfo],
- is_primary: bool,
- label: Option<String>) {
- assert!(lines.len() > 0);
-
- // If a span covers multiple lines, we reduce it to a single
- // point at the start of the span. This means that instead
- // of producing output like this:
- //
- // ```
- // --> foo.rs:2:1
- // 2 |> fn conflicting_items<'grammar>(state: &LR0State<'grammar>)
- // |> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- // 3 |> -> Set<LR0Item<'grammar>>
- // |> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- // (and so on)
- // ```
- //
- // we produce:
- //
- // ```
- // --> foo.rs:2:1
- // 2 |> fn conflicting_items<'grammar>(state: &LR0State<'grammar>)
- // ^
- // ```
- //
- // Basically, although this loses information, multi-line spans just
- // never look good.
-
- let (line, start_col, mut end_col, is_minimized) = if lines.len() == 1 {
- (lines[0].line_index, lines[0].start_col, lines[0].end_col, false)
- } else {
- (lines[0].line_index, lines[0].start_col, CharPos(lines[0].start_col.0 + 1), true)
- };
-
- // Watch out for "empty spans". If we get a span like 6..6, we
- // want to just display a `^` at 6, so convert that to
- // 6..7. This is degenerate input, but it's best to degrade
- // gracefully -- and the parser likes to suply a span like
- // that for EOF, in particular.
- if start_col == end_col {
- end_col.0 += 1;
- }
-
- let index = self.ensure_source_line(line);
- self.lines[index].push_annotation(start_col,
- end_col,
- is_primary,
- is_minimized,
- label);
- }
-
- /// Ensure that we have a `Line` struct corresponding to
- /// `line_index` in the file. If we already have some other lines,
- /// then this will add the intervening lines to ensure that we
- /// have a complete snippet. (Note that when we finally display,
- /// some of those lines may be elided.)
- fn ensure_source_line(&mut self, line_index: usize) -> usize {
- if self.lines.is_empty() {
- self.lines.push(Line::new(line_index));
- return 0;
- }
-
- // Find the range of lines we have thus far.
- let first_line_index = self.lines.first().unwrap().line_index;
- let last_line_index = self.lines.last().unwrap().line_index;
- assert!(first_line_index <= last_line_index);
-
- // If the new line is lower than all the lines we have thus
- // far, then insert the new line and any intervening lines at
- // the front. In a silly attempt at micro-optimization, we
- // don't just call `insert` repeatedly, but instead make a new
- // (empty) vector, pushing the new lines onto it, and then
- // appending the old vector.
- if line_index < first_line_index {
- let lines = mem::replace(&mut self.lines, vec![]);
- self.lines.extend(
- (line_index .. first_line_index)
- .map(|line| Line::new(line))
- .chain(lines));
- return 0;
- }
-
- // If the new line comes after the ones we have so far, insert
- // lines for it.
- if line_index > last_line_index {
- self.lines.extend(
- (last_line_index+1 .. line_index+1)
- .map(|line| Line::new(line)));
- return self.lines.len() - 1;
- }
-
- // Otherwise it should already exist.
- return line_index - first_line_index;
- }
-
- fn render_file_lines(&self, codemap: &Rc<CodeMapper>) -> Vec<RenderedLine> {
- let old_school = check_old_skool();
-
- // As a first step, we elide any instance of more than one
- // continuous unannotated line.
-
- let mut lines_iter = self.lines.iter();
- let mut output = vec![];
-
- // First insert the name of the file.
- if !old_school {
- match self.primary_span {
- Some(span) => {
- let lo = codemap.lookup_char_pos(span.lo);
- output.push(RenderedLine {
- text: vec![StyledString {
- text: lo.file.name.clone(),
- style: Style::FileNameStyle,
- }, StyledString {
- text: format!(":{}:{}", lo.line, lo.col.0 + 1),
- style: Style::LineAndColumn,
- }],
- kind: RenderedLineKind::PrimaryFileName,
- });
- output.push(RenderedLine {
- text: vec![StyledString {
- text: "".to_string(),
- style: Style::FileNameStyle,
- }],
- kind: RenderedLineKind::Annotations,
- });
- }
- None => {
- output.push(RenderedLine {
- text: vec![StyledString {
- text: self.file.name.clone(),
- style: Style::FileNameStyle,
- }],
- kind: RenderedLineKind::OtherFileName,
- });
- output.push(RenderedLine {
- text: vec![StyledString {
- text: "".to_string(),
- style: Style::FileNameStyle,
- }],
- kind: RenderedLineKind::Annotations,
- });
- }
- }
- }
-
- let mut next_line = lines_iter.next();
- while next_line.is_some() {
- // Consume lines with annotations.
- while let Some(line) = next_line {
- if line.annotations.is_empty() { break; }
-
- let mut rendered_lines = self.render_line(line);
- assert!(!rendered_lines.is_empty());
- if old_school {
- match self.primary_span {
- Some(span) => {
- let lo = codemap.lookup_char_pos(span.lo);
- let hi = codemap.lookup_char_pos(span.hi);
- //Before each secondary line in old skool-mode, print the label
- //as an old-style note
- if !line.annotations[0].is_primary {
- if let Some(ann) = line.annotations[0].label.clone() {
- output.push(RenderedLine {
- text: vec![StyledString {
- text: lo.file.name.clone(),
- style: Style::FileNameStyle,
- }, StyledString {
- text: format!(":{}:{}: {}:{} ", lo.line, lo.col.0 + 1,
- hi.line, hi.col.0+1),
- style: Style::LineAndColumn,
- }, StyledString {
- text: format!("note: "),
- style: Style::OldSkoolNote,
- }, StyledString {
- text: format!("{}", ann),
- style: Style::OldSkoolNoteText,
- }],
- kind: RenderedLineKind::Annotations,
- });
- }
- }
- rendered_lines[0].text.insert(0, StyledString {
- text: format!(":{} ", lo.line),
- style: Style::LineAndColumn,
- });
- rendered_lines[0].text.insert(0, StyledString {
- text: lo.file.name.clone(),
- style: Style::FileNameStyle,
- });
- let gap_amount =
- rendered_lines[0].text[0].text.len() +
- rendered_lines[0].text[1].text.len();
- assert!(rendered_lines.len() >= 2,
- "no annotations resulted from: {:?}",
- line);
- for i in 1..rendered_lines.len() {
- rendered_lines[i].text.insert(0, StyledString {
- text: vec![" "; gap_amount].join(""),
- style: Style::NoStyle
- });
- }
- }
- _ =>()
- }
- }
- output.append(&mut rendered_lines);
- next_line = lines_iter.next();
- }
-
- // Emit lines without annotations, but only if they are
- // followed by a line with an annotation.
- let unannotated_line = next_line;
- let mut unannotated_lines = 0;
- while let Some(line) = next_line {
- if !line.annotations.is_empty() { break; }
- unannotated_lines += 1;
- next_line = lines_iter.next();
- }
- if unannotated_lines > 1 {
- output.push(RenderedLine::from((String::new(),
- Style::NoStyle,
- RenderedLineKind::Elision)));
- } else if let Some(line) = unannotated_line {
- output.append(&mut self.render_line(line));
- }
- }
-
- output
- }
-
- fn render_line(&self, line: &Line) -> Vec<RenderedLine> {
- let old_school = check_old_skool();
- let source_string = self.file.get_line(line.line_index)
- .unwrap_or("");
- let source_kind = RenderedLineKind::SourceText {
- file: self.file.clone(),
- line_index: line.line_index,
- };
-
- let mut styled_buffer = StyledBuffer::new();
-
- // First create the source line we will highlight.
- styled_buffer.append(0, &source_string, Style::Quotation);
-
- if line.annotations.is_empty() {
- return styled_buffer.render(source_kind);
- }
-
- // We want to display like this:
- //
- // vec.push(vec.pop().unwrap());
- // --- ^^^ _ previous borrow ends here
- // | |
- // | error occurs here
- // previous borrow of `vec` occurs here
- //
- // But there are some weird edge cases to be aware of:
- //
- // vec.push(vec.pop().unwrap());
- // -------- - previous borrow ends here
- // ||
- // |this makes no sense
- // previous borrow of `vec` occurs here
- //
- // For this reason, we group the lines into "highlight lines"
- // and "annotations lines", where the highlight lines have the `~`.
-
- //let mut highlight_line = Self::whitespace(&source_string);
-
- // Sort the annotations by (start, end col)
- let mut annotations = line.annotations.clone();
- annotations.sort();
-
- // Next, create the highlight line.
- for annotation in &annotations {
- if old_school {
- for p in annotation.start_col .. annotation.end_col {
- if p == annotation.start_col {
- styled_buffer.putc(1, p, '^',
- if annotation.is_primary {
- Style::UnderlinePrimary
- } else {
- Style::OldSkoolNote
- });
- }
- else {
- styled_buffer.putc(1, p, '~',
- if annotation.is_primary {
- Style::UnderlinePrimary
- } else {
- Style::OldSkoolNote
- });
- }
- }
- }
- else {
- for p in annotation.start_col .. annotation.end_col {
- if annotation.is_primary {
- styled_buffer.putc(1, p, '^', Style::UnderlinePrimary);
- if !annotation.is_minimized {
- styled_buffer.set_style(0, p, Style::UnderlinePrimary);
- }
- } else {
- styled_buffer.putc(1, p, '-', Style::UnderlineSecondary);
- if !annotation.is_minimized {
- styled_buffer.set_style(0, p, Style::UnderlineSecondary);
- }
- }
- }
- }
- }
-
- // Now we are going to write labels in. To start, we'll exclude
- // the annotations with no labels.
- let (labeled_annotations, unlabeled_annotations): (Vec<_>, _) =
- annotations.into_iter()
- .partition(|a| a.label.is_some());
-
- // If there are no annotations that need text, we're done.
- if labeled_annotations.is_empty() {
- return styled_buffer.render(source_kind);
- }
- if old_school {
- return styled_buffer.render(source_kind);
- }
-
- // Now add the text labels. We try, when possible, to stick the rightmost
- // annotation at the end of the highlight line:
- //
- // vec.push(vec.pop().unwrap());
- // --- --- - previous borrow ends here
- //
- // But sometimes that's not possible because one of the other
- // annotations overlaps it. For example, from the test
- // `span_overlap_label`, we have the following annotations
- // (written on distinct lines for clarity):
- //
- // fn foo(x: u32) {
- // --------------
- // -
- //
- // In this case, we can't stick the rightmost-most label on
- // the highlight line, or we would get:
- //
- // fn foo(x: u32) {
- // -------- x_span
- // |
- // fn_span
- //
- // which is totally weird. Instead we want:
- //
- // fn foo(x: u32) {
- // --------------
- // | |
- // | x_span
- // fn_span
- //
- // which is...less weird, at least. In fact, in general, if
- // the rightmost span overlaps with any other span, we should
- // use the "hang below" version, so we can at least make it
- // clear where the span *starts*.
- let mut labeled_annotations = &labeled_annotations[..];
- match labeled_annotations.split_last().unwrap() {
- (last, previous) => {
- if previous.iter()
- .chain(&unlabeled_annotations)
- .all(|a| !overlaps(a, last))
- {
- // append the label afterwards; we keep it in a separate
- // string
- let highlight_label: String = format!(" {}", last.label.as_ref().unwrap());
- if last.is_primary {
- styled_buffer.append(1, &highlight_label, Style::LabelPrimary);
- } else {
- styled_buffer.append(1, &highlight_label, Style::LabelSecondary);
- }
- labeled_annotations = previous;
- }
- }
- }
-
- // If that's the last annotation, we're done
- if labeled_annotations.is_empty() {
- return styled_buffer.render(source_kind);
- }
-
- for (index, annotation) in labeled_annotations.iter().enumerate() {
- // Leave:
- // - 1 extra line
- // - One line for each thing that comes after
- let comes_after = labeled_annotations.len() - index - 1;
- let blank_lines = 3 + comes_after;
-
- // For each blank line, draw a `|` at our column. The
- // text ought to be long enough for this.
- for index in 2..blank_lines {
- if annotation.is_primary {
- styled_buffer.putc(index, annotation.start_col, '|', Style::UnderlinePrimary);
- } else {
- styled_buffer.putc(index, annotation.start_col, '|', Style::UnderlineSecondary);
- }
- }
-
- if annotation.is_primary {
- styled_buffer.puts(blank_lines, annotation.start_col,
- annotation.label.as_ref().unwrap(), Style::LabelPrimary);
- } else {
- styled_buffer.puts(blank_lines, annotation.start_col,
- annotation.label.as_ref().unwrap(), Style::LabelSecondary);
- }
- }
-
- styled_buffer.render(source_kind)
- }
-}
-
-fn prepend_prefixes(rendered_lines: &mut [RenderedLine]) {
- let old_school = check_old_skool();
- if old_school {
- return;
- }
-
- let prefixes: Vec<_> =
- rendered_lines.iter()
- .map(|rl| rl.kind.prefix())
- .collect();
-
- // find the max amount of spacing we need; add 1 to
- // p.text.len() to leave space between the prefix and the
- // source text
- let padding_len =
- prefixes.iter()
- .map(|p| if p.text.len() == 0 { 0 } else { p.text.len() + 1 })
- .max()
- .unwrap_or(0);
-
- // Ensure we insert at least one character of padding, so that the
- // `-->` arrows can fit etc.
- let padding_len = cmp::max(padding_len, 1);
-
- for (mut prefix, line) in prefixes.into_iter().zip(rendered_lines) {
- let extra_spaces = (prefix.text.len() .. padding_len).map(|_| ' ');
- prefix.text.extend(extra_spaces);
- match line.kind {
- RenderedLineKind::Elision => {
- line.text.insert(0, prefix);
- }
- RenderedLineKind::PrimaryFileName => {
- // --> filename
- // 22 |>
- // ^
- // padding_len
- let dashes = (0..padding_len - 1).map(|_| ' ')
- .chain(Some('-'))
- .chain(Some('-'))
- .chain(Some('>'))
- .chain(Some(' '));
- line.text.insert(0, StyledString {text: dashes.collect(),
- style: Style::LineNumber})
- }
- RenderedLineKind::OtherFileName => {
- // ::: filename
- // 22 |>
- // ^
- // padding_len
- let dashes = (0..padding_len - 1).map(|_| ' ')
- .chain(Some(':'))
- .chain(Some(':'))
- .chain(Some(':'))
- .chain(Some(' '));
- line.text.insert(0, StyledString {text: dashes.collect(),
- style: Style::LineNumber})
- }
- _ => {
- line.text.insert(0, prefix);
- line.text.insert(1, StyledString {text: String::from("|> "),
- style: Style::LineNumber})
- }
- }
- }
-}
-
-fn trim_lines(rendered_lines: &mut [RenderedLine]) {
- for line in rendered_lines {
- while !line.text.is_empty() {
- line.trim_last();
- if line.text.last().unwrap().text.is_empty() {
- line.text.pop();
- } else {
- break;
- }
- }
- }
-}
-
-impl Line {
- fn new(line_index: usize) -> Line {
- Line {
- line_index: line_index,
- annotations: vec![]
- }
- }
-
- fn push_annotation(&mut self,
- start: CharPos,
- end: CharPos,
- is_primary: bool,
- is_minimized: bool,
- label: Option<String>) {
- self.annotations.push(Annotation {
- start_col: start.0,
- end_col: end.0,
- is_primary: is_primary,
- is_minimized: is_minimized,
- label: label,
- });
- }
-}
-
-fn overlaps(a1: &Annotation,
- a2: &Annotation)
- -> bool
-{
- (a2.start_col .. a2.end_col).contains(a1.start_col) ||
- (a1.start_col .. a1.end_col).contains(a2.start_col)
-}
use syntax_pos::*;
use errors::{Level, CodeSuggestion};
use errors::emitter::EmitterWriter;
+ use errors::snippet::SnippetData;
use std::sync::{Arc, Mutex};
use std::io::{self, Write};
use std::str::from_utf8;
blork.rs:1:1: 1:12\n `first line.`\n");
}
+ /// Returns the span corresponding to the `n`th occurrence of
+ /// `substring` in `source_text`.
+ trait CodeMapExtension {
+ fn span_substr(&self,
+ file: &Rc<FileMap>,
+ source_text: &str,
+ substring: &str,
+ n: usize)
+ -> Span;
+ }
+
+ impl CodeMapExtension for CodeMap {
+ fn span_substr(&self,
+ file: &Rc<FileMap>,
+ source_text: &str,
+ substring: &str,
+ n: usize)
+ -> Span
+ {
+ println!("span_substr(file={:?}/{:?}, substring={:?}, n={})",
+ file.name, file.start_pos, substring, n);
+ let mut i = 0;
+ let mut hi = 0;
+ loop {
+ let offset = source_text[hi..].find(substring).unwrap_or_else(|| {
+ panic!("source_text `{}` does not have {} occurrences of `{}`, only {}",
+ source_text, n, substring, i);
+ });
+ let lo = hi + offset;
+ hi = lo + substring.len();
+ if i == n {
+ let span = Span {
+ lo: BytePos(lo as u32 + file.start_pos.0),
+ hi: BytePos(hi as u32 + file.start_pos.0),
+ expn_id: NO_EXPANSION,
+ };
+ assert_eq!(&self.span_to_snippet(span).unwrap()[..],
+ substring);
+ return span;
+ }
+ i += 1;
+ }
+ }
+ }
+
+ fn splice(start: Span, end: Span) -> Span {
+ Span {
+ lo: start.lo,
+ hi: end.hi,
+ expn_id: NO_EXPANSION,
+ }
+ }
+
+ fn make_string(lines: &[RenderedLine]) -> String {
+ lines.iter()
+ .flat_map(|rl| {
+ rl.text.iter()
+ .map(|s| &s.text[..])
+ .chain(Some("\n"))
+ })
+ .collect()
+ }
+
fn init_expansion_chain(cm: &CodeMap) -> Span {
// Creates an expansion chain containing two recursive calls
// root -> expA -> expA -> expB -> expB -> end
vec![field("desc", desc_expr),
field("testfn", testfn_expr)])
}
-
-/// Returns the span corresponding to the `n`th occurrence of
-/// `substring` in `source_text`.
-trait CodeMapExtension {
- fn span_substr(&self,
- file: &Rc<FileMap>,
- source_text: &str,
- substring: &str,
- n: usize)
- -> Span;
-}
-
-impl CodeMapExtension for CodeMap {
- fn span_substr(&self,
- file: &Rc<FileMap>,
- source_text: &str,
- substring: &str,
- n: usize)
- -> Span
- {
- println!("span_substr(file={:?}/{:?}, substring={:?}, n={})",
- file.name, file.start_pos, substring, n);
- let mut i = 0;
- let mut hi = 0;
- loop {
- let offset = source_text[hi..].find(substring).unwrap_or_else(|| {
- panic!("source_text `{}` does not have {} occurrences of `{}`, only {}",
- source_text, n, substring, i);
- });
- let lo = hi + offset;
- hi = lo + substring.len();
- if i == n {
- let span = Span {
- lo: BytePos(lo as u32 + file.start_pos.0),
- hi: BytePos(hi as u32 + file.start_pos.0),
- expn_id: NO_EXPANSION,
- };
- assert_eq!(&self.span_to_snippet(span).unwrap()[..],
- substring);
- return span;
- }
- i += 1;
- }
- }
-}
-
-fn splice(start: Span, end: Span) -> Span {
- Span {
- lo: start.lo,
- hi: end.hi,
- expn_id: NO_EXPANSION,
- }
-}
-
-fn make_string(lines: &[RenderedLine]) -> String {
- lines.iter()
- .flat_map(|rl| {
- rl.text.iter()
- .map(|s| &s.text[..])
- .chain(Some("\n"))
- })
- .collect()
-}
projects / rust.git / commitdiff