summaryrefslogtreecommitdiff
path: root/src/plugins/qmljseditor/qmljsautocompleter.cpp
blob: b160d3cedfb25305184a0577c2e0a68c700e6469 (plain)
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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (info@qt.nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at info@qt.nokia.com.
**
**************************************************************************/

#include "qmljsautocompleter.h"

#include <qmljs/qmljsscanner.h>

#include <QtCore/QChar>
#include <QtCore/QLatin1Char>
#include <QtGui/QTextDocument>
#include <QtGui/QTextCursor>
#include <QtGui/QTextBlock>

using namespace QmlJSEditor;
using namespace Internal;
using namespace QmlJS;

static int blockStartState(const QTextBlock &block)
{
    int state = block.previous().userState();

    if (state == -1)
        return 0;
    else
        return state & 0xff;
}

static Token tokenUnderCursor(const QTextCursor &cursor)
{
    const QString blockText = cursor.block().text();
    const int blockState = blockStartState(cursor.block());

    Scanner tokenize;
    const QList<Token> tokens = tokenize(blockText, blockState);
    const int pos = cursor.positionInBlock();

    int tokenIndex = 0;
    for (; tokenIndex < tokens.size(); ++tokenIndex) {
        const Token &token = tokens.at(tokenIndex);

        if (token.is(Token::Comment) || token.is(Token::String)) {
            if (pos > token.begin() && pos <= token.end())
                break;
        } else {
            if (pos >= token.begin() && pos < token.end())
                break;
        }
    }

    if (tokenIndex != tokens.size())
        return tokens.at(tokenIndex);

    return Token();
}

static bool shouldInsertMatchingText(QChar lookAhead)
{
    switch (lookAhead.unicode()) {
    case '{': case '}':
    case ']': case ')':
    case ';': case ',':
    case '"': case '\'':
        return true;

    default:
        if (lookAhead.isSpace())
            return true;

        return false;
    } // switch
}

static bool shouldInsertMatchingText(const QTextCursor &tc)
{
    QTextDocument *doc = tc.document();
    return shouldInsertMatchingText(doc->characterAt(tc.selectionEnd()));
}

static bool shouldInsertNewline(const QTextCursor &tc)
{
    QTextDocument *doc = tc.document();
    int pos = tc.selectionEnd();

    // count the number of empty lines.
    int newlines = 0;
    for (int e = doc->characterCount(); pos != e; ++pos) {
        const QChar ch = doc->characterAt(pos);

        if (! ch.isSpace())
            break;
        else if (ch == QChar::ParagraphSeparator)
            ++newlines;
    }

    if (newlines <= 1 && doc->characterAt(pos) != QLatin1Char('}'))
        return true;

    return false;
}

static bool isCompleteStringLiteral(const QStringRef &text)
{
    if (text.length() < 2)
        return false;

    const QChar quote = text.at(0);

    if (text.at(text.length() - 1) == quote)
        return text.at(text.length() - 2) != QLatin1Char('\\'); // ### not exactly.

    return false;
}

AutoCompleter::AutoCompleter()
{}

AutoCompleter::~AutoCompleter()
{}

bool AutoCompleter::contextAllowsAutoParentheses(const QTextCursor &cursor,
                                                 const QString &textToInsert) const
{
    QChar ch;

    if (! textToInsert.isEmpty())
        ch = textToInsert.at(0);

    switch (ch.unicode()) {
    case '\'':
    case '"':

    case '(':
    case '[':
    case '{':

    case ')':
    case ']':
    case '}':

    case ';':
        break;

    default:
        if (ch.isNull())
            break;

        return false;
    } // end of switch

    const Token token = tokenUnderCursor(cursor);
    switch (token.kind) {
    case Token::Comment:
        return false;

    case Token::String: {
        const QString blockText = cursor.block().text();
        const QStringRef tokenText = blockText.midRef(token.offset, token.length);
        QChar quote = tokenText.at(0);
        // if a string literal doesn't start with a quote, it must be multiline
        if (quote != QLatin1Char('"') && quote != QLatin1Char('\'')) {
            const int startState = blockStartState(cursor.block());
            if ((startState & Scanner::MultiLineMask) == Scanner::MultiLineStringDQuote)
                quote = QLatin1Char('"');
            else if ((startState & Scanner::MultiLineMask) == Scanner::MultiLineStringSQuote)
                quote = QLatin1Char('\'');
        }

        // never insert ' into string literals, it adds spurious ' when writing contractions
        if (ch == QLatin1Char('\''))
            return false;

        if (ch != quote || isCompleteStringLiteral(tokenText))
            break;

        return false;
    }

    default:
        break;
    } // end of switch

    return true;
}

bool AutoCompleter::contextAllowsElectricCharacters(const QTextCursor &cursor) const
{
    Token token = tokenUnderCursor(cursor);
    switch (token.kind) {
    case Token::Comment:
    case Token::String:
        return false;
    default:
        return true;
    }
}

bool AutoCompleter::isInComment(const QTextCursor &cursor) const
{
    return tokenUnderCursor(cursor).is(Token::Comment);
}

QString AutoCompleter::insertMatchingBrace(const QTextCursor &cursor,
                                           const QString &text,
                                           QChar,
                                           int *skippedChars) const
{
    if (text.length() != 1)
        return QString();

    if (! shouldInsertMatchingText(cursor))
        return QString();

    const QChar la = cursor.document()->characterAt(cursor.position());

    const QChar ch = text.at(0);
    switch (ch.unicode()) {
    case '\'':
        if (la != ch)
            return QString(ch);
        ++*skippedChars;
        break;

    case '"':
        if (la != ch)
            return QString(ch);
        ++*skippedChars;
        break;

    case '(':
        return QString(QLatin1Char(')'));

    case '[':
        return QString(QLatin1Char(']'));

    case '{':
        return QString(); // nothing to do.

    case ')':
    case ']':
    case '}':
    case ';':
        if (la == ch)
            ++*skippedChars;
        break;

    default:
        break;
    } // end of switch

    return QString();
}

QString AutoCompleter::insertParagraphSeparator(const QTextCursor &cursor) const
{
    if (shouldInsertNewline(cursor)) {
        QTextCursor selCursor = cursor;
        selCursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
        if (! selCursor.selectedText().trimmed().isEmpty())
            return QString();

        return QLatin1String("}\n");
    }

    return QLatin1String("}");
}