Highlighter.cpp revision 360784 
1//===-- Highlighter.cpp -----------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "lldb/Core/Highlighter.h"
10
11#include "lldb/Target/Language.h"
12#include "lldb/Utility/AnsiTerminal.h"
13#include "lldb/Utility/StreamString.h"
14
15using namespace lldb_private;
16using namespace lldb_private::ansi;
17
18void HighlightStyle::ColorStyle::Apply(Stream &s, llvm::StringRef value) const {
19  s << m_prefix << value << m_suffix;
20}
21
22void HighlightStyle::ColorStyle::Set(llvm::StringRef prefix,
23                                     llvm::StringRef suffix) {
24  m_prefix = FormatAnsiTerminalCodes(prefix);
25  m_suffix = FormatAnsiTerminalCodes(suffix);
26}
27
28void DefaultHighlighter::Highlight(const HighlightStyle &options,
29                                   llvm::StringRef line,
30                                   llvm::Optional<size_t> cursor_pos,
31                                   llvm::StringRef previous_lines,
32                                   Stream &s) const {
33  // If we don't have a valid cursor, then we just print the line as-is.
34  if (!cursor_pos || *cursor_pos >= line.size()) {
35    s << line;
36    return;
37  }
38
39  // If we have a valid cursor, we have to apply the 'selected' style around
40  // the character below the cursor.
41
42  // Split the line around the character which is below the cursor.
43  size_t column = *cursor_pos;
44  // Print the characters before the cursor.
45  s << line.substr(0, column);
46  // Print the selected character with the defined color codes.
47  options.selected.Apply(s, line.substr(column, 1));
48  // Print the rest of the line.
49  s << line.substr(column + 1U);
50}
51
52static HighlightStyle::ColorStyle GetColor(const char *c) {
53  return HighlightStyle::ColorStyle(c, "${ansi.normal}");
54}
55
56HighlightStyle HighlightStyle::MakeVimStyle() {
57  HighlightStyle result;
58  result.comment = GetColor("${ansi.fg.purple}");
59  result.scalar_literal = GetColor("${ansi.fg.red}");
60  result.keyword = GetColor("${ansi.fg.green}");
61  return result;
62}
63
64const Highlighter &
65HighlighterManager::getHighlighterFor(lldb::LanguageType language_type,
66                                      llvm::StringRef path) const {
67  Language *language = lldb_private::Language::FindPlugin(language_type, path);
68  if (language && language->GetHighlighter())
69    return *language->GetHighlighter();
70  return m_default;
71}
72
73std::string Highlighter::Highlight(const HighlightStyle &options,
74                                   llvm::StringRef line,
75                                   llvm::Optional<size_t> cursor_pos,
76                                   llvm::StringRef previous_lines) const {
77  StreamString s;
78  Highlight(options, line, cursor_pos, previous_lines, s);
79  s.Flush();
80  return s.GetString().str();
81}
82