822 lines
28 KiB
Rust
822 lines
28 KiB
Rust
// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Code for annotating snippets.
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use codemap::{CharPos, CodeMap, FileMap, LineInfo, Span};
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use errors::check_old_skool;
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use std::cmp;
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use std::rc::Rc;
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use std::mem;
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mod test;
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#[derive(Clone)]
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pub struct SnippetData {
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codemap: Rc<CodeMap>,
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files: Vec<FileInfo>,
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}
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#[derive(Clone)]
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pub struct FileInfo {
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file: Rc<FileMap>,
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/// The "primary file", if any, gets a `-->` marker instead of
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/// `>>>`, and has a line-number/column printed and not just a
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/// filename. It appears first in the listing. It is known to
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/// contain at least one primary span, though primary spans (which
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/// are designated with `^^^`) may also occur in other files.
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primary_span: Option<Span>,
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lines: Vec<Line>,
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}
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#[derive(Clone, Debug)]
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struct Line {
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line_index: usize,
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annotations: Vec<Annotation>,
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}
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#[derive(Clone, Debug, PartialOrd, Ord, PartialEq, Eq)]
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struct Annotation {
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/// Start column, 0-based indexing -- counting *characters*, not
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/// utf-8 bytes. Note that it is important that this field goes
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/// first, so that when we sort, we sort orderings by start
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/// column.
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start_col: usize,
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/// End column within the line (exclusive)
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end_col: usize,
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/// Is this annotation derived from primary span
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is_primary: bool,
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/// Optional label to display adjacent to the annotation.
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label: Option<String>,
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}
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#[derive(Debug)]
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pub struct RenderedLine {
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pub text: Vec<StyledString>,
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pub kind: RenderedLineKind,
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}
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#[derive(Debug)]
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pub struct StyledString {
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pub text: String,
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pub style: Style,
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}
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#[derive(Debug)]
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pub struct StyledBuffer {
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text: Vec<Vec<char>>,
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styles: Vec<Vec<Style>>
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}
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#[derive(Copy, Clone, Debug, PartialEq)]
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pub enum Style {
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FileNameStyle,
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LineAndColumn,
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LineNumber,
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Quotation,
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UnderlinePrimary,
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UnderlineSecondary,
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LabelPrimary,
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LabelSecondary,
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NoStyle,
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}
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#[derive(Debug, Clone)]
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pub enum RenderedLineKind {
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PrimaryFileName,
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OtherFileName,
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SourceText {
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file: Rc<FileMap>,
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line_index: usize,
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},
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Annotations,
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Elision,
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}
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impl SnippetData {
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pub fn new(codemap: Rc<CodeMap>,
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primary_span: Option<Span>) // (*)
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-> Self {
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// (*) The primary span indicates the file that must appear
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// first, and which will have a line number etc in its
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// name. Outside of tests, this is always `Some`, but for many
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// tests it's not relevant to test this portion of the logic,
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// and it's tedious to pick a primary span (read: tedious to
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// port older tests that predate the existence of a primary
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// span).
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debug!("SnippetData::new(primary_span={:?})", primary_span);
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let mut data = SnippetData {
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codemap: codemap.clone(),
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files: vec![]
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};
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if let Some(primary_span) = primary_span {
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let lo = codemap.lookup_char_pos(primary_span.lo);
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data.files.push(
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FileInfo {
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file: lo.file,
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primary_span: Some(primary_span),
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lines: vec![],
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});
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}
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data
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}
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pub fn push(&mut self, span: Span, is_primary: bool, label: Option<String>) {
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debug!("SnippetData::push(span={:?}, is_primary={}, label={:?})",
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span, is_primary, label);
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let file_lines = match self.codemap.span_to_lines(span) {
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Ok(file_lines) => file_lines,
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Err(_) => {
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// ignore unprintable spans completely.
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return;
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}
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};
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self.file(&file_lines.file)
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.push_lines(&file_lines.lines, is_primary, label);
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}
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fn file(&mut self, file_map: &Rc<FileMap>) -> &mut FileInfo {
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let index = self.files.iter().position(|f| f.file.name == file_map.name);
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if let Some(index) = index {
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return &mut self.files[index];
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}
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self.files.push(
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FileInfo {
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file: file_map.clone(),
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lines: vec![],
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primary_span: None,
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});
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self.files.last_mut().unwrap()
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}
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pub fn render_lines(&self) -> Vec<RenderedLine> {
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debug!("SnippetData::render_lines()");
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let mut rendered_lines: Vec<_> =
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self.files.iter()
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.flat_map(|f| f.render_file_lines(&self.codemap))
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.collect();
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prepend_prefixes(&mut rendered_lines);
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trim_lines(&mut rendered_lines);
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rendered_lines
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}
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}
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pub trait StringSource {
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fn make_string(self) -> String;
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}
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impl StringSource for String {
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fn make_string(self) -> String {
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self
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}
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}
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impl StringSource for Vec<char> {
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fn make_string(self) -> String {
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self.into_iter().collect()
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}
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}
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impl<S> From<(S, Style, RenderedLineKind)> for RenderedLine
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where S: StringSource
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{
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fn from((text, style, kind): (S, Style, RenderedLineKind)) -> Self {
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RenderedLine {
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text: vec![StyledString {
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text: text.make_string(),
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style: style,
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}],
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kind: kind,
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}
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}
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}
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impl<S1,S2> From<(S1, Style, S2, Style, RenderedLineKind)> for RenderedLine
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where S1: StringSource, S2: StringSource
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{
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fn from(tuple: (S1, Style, S2, Style, RenderedLineKind)) -> Self {
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let (text1, style1, text2, style2, kind) = tuple;
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RenderedLine {
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text: vec![
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StyledString {
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text: text1.make_string(),
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style: style1,
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},
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StyledString {
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text: text2.make_string(),
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style: style2,
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}
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],
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kind: kind,
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}
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}
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}
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impl RenderedLine {
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fn trim_last(&mut self) {
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if let Some(last_text) = self.text.last_mut() {
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let len = last_text.text.trim_right().len();
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last_text.text.truncate(len);
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}
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}
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}
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impl RenderedLineKind {
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fn prefix(&self) -> StyledString {
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match *self {
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RenderedLineKind::SourceText { file: _, line_index } =>
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StyledString {
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text: format!("{}", line_index + 1),
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style: Style::LineNumber,
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},
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RenderedLineKind::Elision =>
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StyledString {
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text: String::from("..."),
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style: Style::LineNumber,
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},
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RenderedLineKind::PrimaryFileName |
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RenderedLineKind::OtherFileName |
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RenderedLineKind::Annotations =>
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StyledString {
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text: String::from(""),
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style: Style::LineNumber,
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},
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}
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}
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}
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impl StyledBuffer {
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fn new() -> StyledBuffer {
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StyledBuffer { text: vec![], styles: vec![] }
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}
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fn render(&self, source_kind: RenderedLineKind) -> Vec<RenderedLine> {
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let mut output: Vec<RenderedLine> = vec![];
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let mut styled_vec: Vec<StyledString> = vec![];
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for (row, row_style) in self.text.iter().zip(&self.styles) {
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let mut current_style = Style::NoStyle;
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let mut current_text = String::new();
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for (&c, &s) in row.iter().zip(row_style) {
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if s != current_style {
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if !current_text.is_empty() {
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styled_vec.push(StyledString { text: current_text, style: current_style });
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}
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current_style = s;
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current_text = String::new();
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}
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current_text.push(c);
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}
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if !current_text.is_empty() {
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styled_vec.push(StyledString { text: current_text, style: current_style });
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}
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if output.is_empty() {
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//We know our first output line is source and the rest are highlights and labels
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output.push(RenderedLine { text: styled_vec, kind: source_kind.clone() });
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} else {
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output.push(RenderedLine { text: styled_vec, kind: RenderedLineKind::Annotations });
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}
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styled_vec = vec![];
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}
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output
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}
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fn putc(&mut self, line: usize, col: usize, chr: char, style: Style) {
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while line >= self.text.len() {
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self.text.push(vec![]);
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self.styles.push(vec![]);
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}
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if col < self.text[line].len() {
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self.text[line][col] = chr;
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self.styles[line][col] = style;
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} else {
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while self.text[line].len() < col {
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self.text[line].push(' ');
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self.styles[line].push(Style::NoStyle);
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}
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self.text[line].push(chr);
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self.styles[line].push(style);
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}
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}
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fn puts(&mut self, line: usize, col: usize, string: &str, style: Style) {
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let mut n = col;
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for c in string.chars() {
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self.putc(line, n, c, style);
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n += 1;
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}
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}
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fn set_style(&mut self, line: usize, col: usize, style: Style) {
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if self.styles.len() > line && self.styles[line].len() > col {
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self.styles[line][col] = style;
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}
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}
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fn append(&mut self, line: usize, string: &str, style: Style) {
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if line >= self.text.len() {
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self.puts(line, 0, string, style);
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} else {
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let col = self.text[line].len();
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self.puts(line, col, string, style);
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}
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}
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}
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impl FileInfo {
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fn push_lines(&mut self,
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lines: &[LineInfo],
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is_primary: bool,
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label: Option<String>) {
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assert!(lines.len() > 0);
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// If a span covers multiple lines, we reduce it to a single
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// point at the start of the span. This means that instead
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// of producing output like this:
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//
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// ```
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// --> foo.rs:2:1
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// 2 |> fn conflicting_items<'grammar>(state: &LR0State<'grammar>)
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// |> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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// 3 |> -> Set<LR0Item<'grammar>>
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// |> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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// (and so on)
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// ```
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//
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// we produce:
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//
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// ```
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// --> foo.rs:2:1
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// 2 |> fn conflicting_items<'grammar>(state: &LR0State<'grammar>)
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// ^
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// ```
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//
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// Basically, although this loses information, multi-line spans just
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// never look good.
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let (line, start_col, end_col) = if lines.len() == 1 {
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(lines[0].line_index, lines[0].start_col, lines[0].end_col)
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} else {
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(lines[0].line_index, lines[0].start_col, CharPos(lines[0].start_col.0 + 1))
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};
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let index = self.ensure_source_line(line);
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self.lines[index].push_annotation(start_col,
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end_col,
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is_primary,
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label);
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}
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/// Ensure that we have a `Line` struct corresponding to
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/// `line_index` in the file. If we already have some other lines,
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/// then this will add the intervening lines to ensure that we
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/// have a complete snippet. (Note that when we finally display,
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/// some of those lines may be elided.)
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fn ensure_source_line(&mut self, line_index: usize) -> usize {
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if self.lines.is_empty() {
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self.lines.push(Line::new(line_index));
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return 0;
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}
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// Find the range of lines we have thus far.
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let first_line_index = self.lines.first().unwrap().line_index;
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let last_line_index = self.lines.last().unwrap().line_index;
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assert!(first_line_index <= last_line_index);
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// If the new line is lower than all the lines we have thus
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// far, then insert the new line and any intervening lines at
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// the front. In a silly attempt at micro-optimization, we
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// don't just call `insert` repeatedly, but instead make a new
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// (empty) vector, pushing the new lines onto it, and then
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// appending the old vector.
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if line_index < first_line_index {
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let lines = mem::replace(&mut self.lines, vec![]);
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self.lines.extend(
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(line_index .. first_line_index)
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.map(|line| Line::new(line))
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.chain(lines));
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return 0;
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}
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// If the new line comes after the ones we have so far, insert
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// lines for it.
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if line_index > last_line_index {
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self.lines.extend(
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(last_line_index+1 .. line_index+1)
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.map(|line| Line::new(line)));
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return self.lines.len() - 1;
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}
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// Otherwise it should already exist.
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return line_index - first_line_index;
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}
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fn render_file_lines(&self, codemap: &Rc<CodeMap>) -> Vec<RenderedLine> {
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let old_school = check_old_skool();
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// As a first step, we elide any instance of more than one
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// continuous unannotated line.
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let mut lines_iter = self.lines.iter();
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let mut output = vec![];
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// First insert the name of the file.
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if !old_school {
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match self.primary_span {
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Some(span) => {
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let lo = codemap.lookup_char_pos(span.lo);
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output.push(RenderedLine {
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text: vec![StyledString {
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text: lo.file.name.clone(),
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style: Style::FileNameStyle,
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}, StyledString {
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text: format!(":{}:{}", lo.line, lo.col.0 + 1),
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style: Style::LineAndColumn,
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}],
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kind: RenderedLineKind::PrimaryFileName,
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});
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}
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None => {
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output.push(RenderedLine {
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text: vec![StyledString {
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text: self.file.name.clone(),
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style: Style::FileNameStyle,
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}],
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kind: RenderedLineKind::OtherFileName,
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});
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}
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}
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}
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let mut next_line = lines_iter.next();
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while next_line.is_some() {
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// Consume lines with annotations.
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while let Some(line) = next_line {
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if line.annotations.is_empty() { break; }
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let mut rendered_lines = self.render_line(line);
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assert!(!rendered_lines.is_empty());
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if old_school {
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match self.primary_span {
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Some(span) => {
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let lo = codemap.lookup_char_pos(span.lo);
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rendered_lines[0].text.insert(0, StyledString {
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text: format!(":{} ", lo.line),
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style: Style::LineAndColumn,
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});
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rendered_lines[0].text.insert(0, StyledString {
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text: lo.file.name.clone(),
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style: Style::FileNameStyle,
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});
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let gap_amount =
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rendered_lines[0].text[0].text.len() +
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rendered_lines[0].text[1].text.len();
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assert!(rendered_lines.len() >= 2,
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"no annotations resulted from: {:?}",
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line);
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for i in 1..rendered_lines.len() {
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rendered_lines[i].text.insert(0, StyledString {
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text: vec![" "; gap_amount].join(""),
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style: Style::NoStyle
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});
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}
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}
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_ =>()
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}
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}
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output.append(&mut rendered_lines);
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next_line = lines_iter.next();
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}
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// Emit lines without annotations, but only if they are
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// followed by a line with an annotation.
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let unannotated_line = next_line;
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let mut unannotated_lines = 0;
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while let Some(line) = next_line {
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if !line.annotations.is_empty() { break; }
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unannotated_lines += 1;
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next_line = lines_iter.next();
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}
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if unannotated_lines > 1 {
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output.push(RenderedLine::from((String::new(),
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Style::NoStyle,
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RenderedLineKind::Elision)));
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} else if let Some(line) = unannotated_line {
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output.append(&mut self.render_line(line));
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}
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}
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output
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}
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|
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fn render_line(&self, line: &Line) -> Vec<RenderedLine> {
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let old_school = check_old_skool();
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let source_string = self.file.get_line(line.line_index)
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.unwrap_or("");
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let source_kind = RenderedLineKind::SourceText {
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file: self.file.clone(),
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line_index: line.line_index,
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|
};
|
|
|
|
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::UnderlineSecondary
|
|
});
|
|
}
|
|
else {
|
|
styled_buffer.putc(1, p, '~',
|
|
if annotation.is_primary {
|
|
Style::UnderlinePrimary
|
|
} else {
|
|
Style::UnderlineSecondary
|
|
});
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
for p in annotation.start_col .. annotation.end_col {
|
|
if annotation.is_primary {
|
|
styled_buffer.putc(1, p, '^', Style::UnderlinePrimary);
|
|
styled_buffer.set_style(0, p, Style::UnderlinePrimary);
|
|
} else {
|
|
styled_buffer.putc(1, 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,
|
|
label: Option<String>) {
|
|
self.annotations.push(Annotation {
|
|
start_col: start.0,
|
|
end_col: end.0,
|
|
is_primary: is_primary,
|
|
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)
|
|
}
|