1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "clangcompletioncontextanalyzer.h"
#include "clangactivationsequencecontextprocessor.h"
#include "clangactivationsequenceprocessor.h"
#include <texteditor/codeassist/assistinterface.h>
#include <cplusplus/BackwardsScanner.h>
#include <cplusplus/ExpressionUnderCursor.h>
#include <cplusplus/SimpleLexer.h>
#include <utils/qtcassert.h>
#include <QDebug>
#include <QTextBlock>
#include <QTextCursor>
using namespace CPlusPlus;
namespace {
bool isTokenForIncludePathCompletion(unsigned tokenKind)
{
return tokenKind == T_STRING_LITERAL
|| tokenKind == T_ANGLE_STRING_LITERAL
|| tokenKind == T_SLASH;
}
bool isTokenForPassThrough(unsigned tokenKind)
{
return tokenKind == T_EOF_SYMBOL
|| tokenKind == T_DOT
|| tokenKind == T_COLON_COLON
|| tokenKind == T_ARROW
|| tokenKind == T_DOT_STAR;
}
} // anonymous namespace
namespace ClangCodeModel {
namespace Internal {
ClangCompletionContextAnalyzer::ClangCompletionContextAnalyzer(
const ClangCompletionAssistInterface *assistInterface,
CPlusPlus::LanguageFeatures languageFeatures)
: m_interface(assistInterface)
, m_languageFeatures(languageFeatures)
{
}
void ClangCompletionContextAnalyzer::analyze()
{
QTC_ASSERT(m_interface, return);
setActionAndClangPosition(PassThroughToLibClang, -1);
ActivationSequenceContextProcessor activationSequenceContextProcessor(m_interface);
m_completionOperator = activationSequenceContextProcessor.completionKind();
int afterOperatorPosition = activationSequenceContextProcessor.startOfNamePosition();
m_positionEndOfExpression = activationSequenceContextProcessor.operatorStartPosition();
m_positionForProposal = activationSequenceContextProcessor.startOfNamePosition();
const bool actionIsSet = handleNonFunctionCall(afterOperatorPosition);
if (!actionIsSet) {
handleCommaInFunctionCall();
handleFunctionCall(afterOperatorPosition);
}
}
int ClangCompletionContextAnalyzer::startOfFunctionCall(int endOfOperator) const
{
int index = ActivationSequenceContextProcessor::skipPrecedingWhitespace(m_interface,
endOfOperator);
QTextCursor textCursor(m_interface->textDocument());
textCursor.setPosition(index);
ExpressionUnderCursor euc(m_languageFeatures);
index = euc.startOfFunctionCall(textCursor);
index = ActivationSequenceContextProcessor::skipPrecedingWhitespace(m_interface, index);
const int functionNameStart = ActivationSequenceContextProcessor::findStartOfName(
m_interface, index, ActivationSequenceContextProcessor::NameCategory::Function);
if (functionNameStart == -1)
return -1;
QTextCursor functionNameSelector(m_interface->textDocument());
functionNameSelector.setPosition(functionNameStart);
functionNameSelector.setPosition(index, QTextCursor::KeepAnchor);
const QString functionName = functionNameSelector.selectedText().trimmed();
if (functionName.isEmpty() && m_completionOperator == T_LBRACE)
return endOfOperator;
return functionName.isEmpty() ? -1 : functionNameStart;
}
void ClangCompletionContextAnalyzer::setActionAndClangPosition(CompletionAction action,
int position,
int functionNameStart)
{
QTC_CHECK(position >= -1);
m_completionAction = action;
m_positionForClang = position;
m_functionNameStart = functionNameStart;
}
void
ClangCompletionContextAnalyzer::setAction(ClangCompletionContextAnalyzer::CompletionAction action)
{
setActionAndClangPosition(action, -1);
}
void ClangCompletionContextAnalyzer::handleCommaInFunctionCall()
{
if (m_completionOperator == T_COMMA) {
ExpressionUnderCursor expressionUnderCursor(m_languageFeatures);
QTextCursor textCursor(m_interface->textDocument());
textCursor.setPosition(m_positionEndOfExpression);
const int start = expressionUnderCursor.startOfFunctionCall(textCursor);
m_positionEndOfExpression = start;
m_positionForProposal = start + 1; // After '(' of function call
if (m_interface->characterAt(start) == '(')
m_completionOperator = T_LPAREN;
else
m_completionOperator = T_LBRACE;
}
}
void ClangCompletionContextAnalyzer::handleFunctionCall(int afterOperatorPosition)
{
if (m_completionOperator == T_LPAREN || m_completionOperator == T_LBRACE) {
ExpressionUnderCursor expressionUnderCursor(m_languageFeatures);
QTextCursor textCursor(m_interface->textDocument());
textCursor.setPosition(m_positionEndOfExpression);
const QString expression = expressionUnderCursor(textCursor);
if (expression.endsWith(QLatin1String("SIGNAL"))) {
setActionAndClangPosition(CompleteSignal, afterOperatorPosition);
} else if (expression.endsWith(QLatin1String("SLOT"))) {
setActionAndClangPosition(CompleteSlot, afterOperatorPosition);
} else if (m_interface->position() != afterOperatorPosition) {
// No function completion if cursor is not after '(' or ','
m_addSnippets = true;
m_positionForProposal = afterOperatorPosition;
setActionAndClangPosition(PassThroughToLibClang, afterOperatorPosition);
} else {
const int functionNameStart = startOfFunctionCall(afterOperatorPosition);
if (functionNameStart >= 0) {
m_addSnippets = functionNameStart == afterOperatorPosition;
// Always pass the position right after '(' to libclang because
// positions after the comma might be problematic if a preceding
// argument is invalid code.
setActionAndClangPosition(PassThroughToLibClangAfterLeftParen,
m_positionForProposal,
functionNameStart);
} else { // e.g. "(" without any function name in front
m_addSnippets = true;
m_positionForProposal = afterOperatorPosition;
setActionAndClangPosition(PassThroughToLibClang, afterOperatorPosition);
}
}
}
}
bool ClangCompletionContextAnalyzer::handleNonFunctionCall(int position)
{
if (isTokenForPassThrough(m_completionOperator)) {
if (m_completionOperator == T_EOF_SYMBOL)
m_addSnippets = true;
setActionAndClangPosition(PassThroughToLibClang, position);
return true;
} else if (m_completionOperator == T_DOXY_COMMENT) {
setAction(CompleteDoxygenKeyword);
return true;
} else if (m_completionOperator == T_POUND) {
// TODO: Check if libclang can complete preprocessor directives
setAction(CompletePreprocessorDirective);
return true;
} else if (isTokenForIncludePathCompletion(m_completionOperator)) {
setAction(CompleteIncludePath);
return true;
}
return false;
}
} // namespace Internal
} // namespace ClangCodeModel
|
