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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "ExpressionUnderCursor.h"
#include "SimpleLexer.h"
#include "BackwardsScanner.h"
#include <cplusplus/Token.h>
#include <QTextCursor>
#include <QTextBlock>
using namespace CPlusPlus;
ExpressionUnderCursor::ExpressionUnderCursor(const LanguageFeatures &languageFeatures)
: _jumpedComma(false)
, _languageFeatures(languageFeatures)
{ }
int ExpressionUnderCursor::startOfExpression(BackwardsScanner &tk, int index)
{
if (tk[index - 1].is(T_GREATER)) {
const int matchingBraceIndex = tk.startOfMatchingBrace(index);
if (tk[matchingBraceIndex - 1].is(T_IDENTIFIER))
index = matchingBraceIndex - 1;
}
index = startOfExpression_helper(tk, index);
if (_jumpedComma) {
const Token &tok = tk[index - 1];
switch (tok.kind()) {
case T_COMMA:
case T_LPAREN:
case T_LBRACKET:
case T_LBRACE:
case T_SEMICOLON:
case T_COLON:
case T_QUESTION:
break;
default:
if (tok.isPunctuationOrOperator())
return startOfExpression(tk, index - 1);
break;
}
}
return index;
}
int ExpressionUnderCursor::startOfExpression_helper(BackwardsScanner &tk, int index)
{
if (tk[index - 1].isLiteral()) {
return index - 1;
} else if (tk[index - 1].is(T_THIS)) {
return index - 1;
} else if (tk[index - 1].is(T_TYPEID)) {
return index - 1;
} else if (tk[index - 1].is(T_SIGNAL)) {
if (tk[index - 2].is(T_COMMA) && !_jumpedComma) {
_jumpedComma = true;
return startOfExpression(tk, index - 2);
}
return index - 1;
} else if (tk[index - 1].is(T_SLOT)) {
if (tk[index - 2].is(T_COMMA) && !_jumpedComma) {
_jumpedComma = true;
return startOfExpression(tk, index - 2);
}
return index - 1;
} else if (tk[index - 1].is(T_IDENTIFIER)) {
if (tk[index - 2].is(T_TILDE)) {
if (tk[index - 3].is(T_COLON_COLON))
return startOfExpression(tk, index - 3);
else if (tk[index - 3].is(T_DOT) || tk[index - 3].is(T_ARROW))
return startOfExpression(tk, index - 3);
return index - 2;
} else if (tk[index - 2].is(T_COLON_COLON)) {
return startOfExpression(tk, index - 1);
} else if (tk[index - 2].is(T_DOT) || tk[index - 2].is(T_ARROW)) {
return startOfExpression(tk, index - 2);
} else if (tk[index - 2].is(T_DOT_STAR) || tk[index - 2].is(T_ARROW_STAR)) {
return startOfExpression(tk, index - 2);
} else if (tk[index - 2].is(T_LBRACKET)) {
// array subscription:
// array[i
return index - 1;
} else if (tk[index - 2].is(T_COLON)) {
// either of:
// cond ? expr1 : id
// or:
// [receiver messageParam:id
// and in both cases, the id (and only the id) is what we want, so:
return index - 1;
} else if (tk[index - 2].is(T_IDENTIFIER) && tk[index - 3].is(T_LBRACKET)) {
// Very common Objective-C case:
// [receiver message
// which we handle immediately:
return index - 3;
} else {
#if 0 // see QTCREATORBUG-1501
// See if we are handling an Objective-C messaging expression in the form of:
// [receiver messageParam1:expression messageParam2
// or:
// [receiver messageParam1:expression messageParam2:expression messageParam3
// ... etc
int i = index - 1;
while (i >= 0 && tk[i].isNot(T_EOF_SYMBOL)) {
if (tk[i].is(T_LBRACKET))
break;
if (tk[i].is(T_LBRACE) || tk[i].is(T_RBRACE))
break;
else if (tk[i].is(T_RBRACKET))
i = tk.startOfMatchingBrace(i + 1) - 1;
else
--i;
}
if (i >= 0) {
int j = i;
while (tk[j].is(T_LBRACKET))
++j;
if (tk[j].is(T_IDENTIFIER) && tk[j + 1].is(T_IDENTIFIER))
return i;
}
#endif
}
return index - 1;
} else if (tk[index - 1].is(T_RPAREN)) {
int matchingBraceIndex = tk.startOfMatchingBrace(index);
if (! matchingBraceIndex)
return matchingBraceIndex;
if (matchingBraceIndex != index) {
if (tk[matchingBraceIndex - 1].is(T_GREATER)) {
int lessIndex = tk.startOfMatchingBrace(matchingBraceIndex);
if (lessIndex != matchingBraceIndex - 1) {
if (tk[lessIndex - 1].is(T_DYNAMIC_CAST) ||
tk[lessIndex - 1].is(T_STATIC_CAST) ||
tk[lessIndex - 1].is(T_CONST_CAST) ||
tk[lessIndex - 1].is(T_REINTERPRET_CAST))
return lessIndex - 1;
else if (tk[lessIndex - 1].is(T_IDENTIFIER))
return startOfExpression(tk, lessIndex);
else if (tk[lessIndex - 1].is(T_SIGNAL))
return startOfExpression(tk, lessIndex);
else if (tk[lessIndex - 1].is(T_SLOT))
return startOfExpression(tk, lessIndex);
}
} else if (tk[matchingBraceIndex - 1].is(T_RBRACE)) {
// lambda: [](){} ()
int leftBraceIndex = tk.startOfMatchingBrace(matchingBraceIndex);
if (matchingBraceIndex != leftBraceIndex) {
int currentIndex = leftBraceIndex;
while (currentIndex >= 0) {
if (tk[currentIndex-1].is(T_RPAREN)) {
int leftParenIndex = tk.startOfMatchingBrace(currentIndex);
if (tk[leftParenIndex-1].is(T_THROW)) {
currentIndex = leftParenIndex-1;
continue;
} else if (tk[leftParenIndex-1].is(T_RBRACKET)) {
int leftBracketIndex = tk.startOfMatchingBrace(leftParenIndex);
if (leftBracketIndex != leftParenIndex-1)
return leftBracketIndex;
}
} else if (tk[currentIndex-1].is(T_RBRACKET)) {
int leftBracketIndex = tk.startOfMatchingBrace(currentIndex);
if (leftBracketIndex != currentIndex-1)
return leftBracketIndex;
}
--currentIndex;
}
}
}
return startOfExpression(tk, matchingBraceIndex);
}
return index;
} else if (tk[index - 1].is(T_RBRACKET)) {
int rbracketIndex = tk.startOfMatchingBrace(index);
if (rbracketIndex != index)
return startOfExpression(tk, rbracketIndex);
return index;
} else if (tk[index - 1].is(T_COLON_COLON)) {
if (tk[index - 2].is(T_GREATER)) { // ### not exactly
int lessIndex = tk.startOfMatchingBrace(index - 1);
if (lessIndex != index - 1)
return startOfExpression(tk, lessIndex);
return index - 1;
} else if (tk[index - 2].is(T_IDENTIFIER)) {
return startOfExpression(tk, index - 1);
}
return index - 1;
} else if (tk[index - 1].is(T_DOT) || tk[index - 1].is(T_ARROW)) {
return startOfExpression(tk, index - 1);
} else if (tk[index - 1].is(T_DOT_STAR) || tk[index - 1].is(T_ARROW_STAR)) {
return startOfExpression(tk, index - 1);
}
return index;
}
QString ExpressionUnderCursor::operator()(const QTextCursor &cursor)
{
BackwardsScanner scanner(cursor, _languageFeatures);
_jumpedComma = false;
const int initialSize = scanner.startToken();
const int i = startOfExpression(scanner, initialSize);
if (i == initialSize)
return QString();
return scanner.mid(i);
}
int ExpressionUnderCursor::startOfFunctionCall(const QTextCursor &cursor) const
{
BackwardsScanner scanner(cursor, _languageFeatures);
int index = scanner.startToken();
forever {
const Token &tk = scanner[index - 1];
if (tk.is(T_EOF_SYMBOL)) {
break;
} else if (tk.is(T_LPAREN) || tk.is(T_LBRACE)) {
return scanner.startPosition() + tk.utf16charsBegin();
} else if (tk.is(T_RPAREN) || tk.is(T_RBRACE)) {
int matchingBrace = scanner.startOfMatchingBrace(index);
if (matchingBrace == index) // If no matching brace found
return -1;
index = matchingBrace;
} else {
--index;
}
}
return -1;
}
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