C++: Introduce the new CodeFormatter.

Done-with: Erik Verbruggen

1 files changed, 195 insertions, 0 deletions

diff --git a/src/plugins/cpptools/cppcodeformatter.h b/src/plugins/cpptools/cppcodeformatter.h
new file mode 100644
index 0000000000..051b5f2aac
--- /dev/null
+++ b/src/plugins/cpptools/cppcodeformatter.h
@@ -0,0 +1,195 @@
+#ifndef CPPCODEFORMATTER_H
+#define CPPCODEFORMATTER_H
+
+#include "cpptools_global.h"
+
+#include <cplusplus/SimpleLexer.h>
+#include <Token.h>
+
+#include <QtCore/QChar>
+#include <QtCore/QStack>
+#include <QtCore/QList>
+#include <QtCore/QVector>
+#include <QtCore/QPointer>
+
+QT_BEGIN_NAMESPACE
+class QTextDocument;
+class QTextBlock;
+QT_END_NAMESPACE
+
+namespace CppTools {    
+namespace Internal {
+class CppCodeFormatterData;
+}
+
+class CPPTOOLS_EXPORT CodeFormatter
+{
+public:
+    CodeFormatter();
+    virtual ~CodeFormatter();
+
+    void setDocument(QTextDocument *document);
+
+    int indentFor(const QTextBlock &block);
+
+protected:
+    virtual void onEnter(int newState, int *indentDepth, int *savedIndentDepth) const = 0;
+    virtual void adjustIndent(const QList<CPlusPlus::Token> &tokens, int lexerState, int *indentDepth) const = 0;
+
+protected:
+    enum StateType {
+        invalid = 0,
+
+        topmost_intro, // The first line in a "topmost" definition.
+
+        multiline_comment_start, // Inside the first line of a multi-line C style block comment.
+        multiline_comment_cont, // Inside the following lines of a multi-line C style block comment.
+        cpp_macro_start, // After the '#' token
+        cpp_macro, // The start of a C preprocessor macro definition.
+        cpp_macro_cont, // Subsequent lines of a multi-line C preprocessor macro definition.
+        cpp_macro_conditional, // Special marker used for separating saved from current state when dealing with #ifdef
+        qt_like_macro, // after an identifier starting with Q_ or QT_ at the beginning of the line
+
+        defun_open, // Brace that opens a top-level function definition.
+        using_start, // right after the "using" token
+
+        class_start, // after the 'class' token
+        class_open, // Brace that opens a class definition.
+        member_init_open, // After ':' that starts a member initialization list.
+
+        enum_start, // After 'enum'
+        brace_list_open, // Open brace of an enum or static array list.
+
+        namespace_start, // after the namespace token, before the opening brace.
+        namespace_open, // Brace that opens a C++ namespace block.
+
+        declaration_start, // shifted a token which could start a declaration.
+        operator_declaration, // after 'operator' in declaration_start
+
+        template_start, // after the 'template' token
+        template_param, // after the '<' in a template_start
+
+        if_statement, // After 'if'
+        maybe_else, // after the first substatement in an if
+        else_clause, // The else line of an if-else construct.
+
+        for_statement, // After the 'for' token
+        for_statement_paren_open, // While inside the (...)
+        for_statement_init, // The initializer part of the for statement
+        for_statement_condition, // The condition part of the for statement
+        for_statement_expression, // The expression part of the for statement
+
+        switch_statement, // After 'switch' token
+        case_start, // after a 'case' or 'default' token
+        case_cont, // after the colon in a case/default
+
+        statement_with_condition, // A statement that takes a condition after the start token.
+        do_statement, // After 'do' token
+        return_statement, // After 'return'
+        block_open, // Statement block open brace.
+
+        substatement, // The first line after a conditional or loop construct.
+        substatement_open, // The brace that opens a substatement block.
+
+        arglist_open, // after the lparen. TODO: check if this is enough.
+        stream_op, // Lines continuing a stream operator (C++ only).
+        ternary_op, // The ? : operator
+
+        condition_open, // Start of a condition in 'if', 'while', entered after opening paren
+        condition_paren_open, // After an lparen in a condition
+
+        assign_open, // after an assignment token
+
+        expression, // after a '=' in a declaration_start once we're sure it's not '= {'
+        initializer, // after a '=' in a declaration start
+    };
+
+    struct State {
+        State()
+            : savedIndentDepth(0)
+            , type(0)
+        {}
+
+        State(quint8 ty, quint16 savedDepth)
+            : savedIndentDepth(savedDepth)
+            , type(ty)
+        {}
+
+        quint16 savedIndentDepth;
+        quint8 type;
+
+        bool operator==(const State &other) const {
+            return type == other.type
+                && savedIndentDepth == other.savedIndentDepth;
+        }
+    };
+
+    State state(int belowTop = 0) const;
+    int tokenIndex() const;
+    int tokenIndexFromEnd() const;
+    const CPlusPlus::Token &currentToken() const;
+    const CPlusPlus::Token &tokenAt(int idx) const;
+
+    bool isBracelessState(int type) const;
+
+    void invalidateCache();
+
+private:
+    void requireStatesUntil(const QTextBlock &block);
+    void recalculateStateAfter(const QTextBlock &block);
+    void storeBlockState(const QTextBlock &block);
+    void restoreBlockState(const QTextBlock &block);
+
+    QStringRef currentTokenText() const;
+
+    int tokenizeBlock(const QTextBlock &block, bool *endedJoined = 0);
+
+    void turnInto(int newState);
+
+    bool tryExpression(bool alsoExpression = false);
+    bool tryDeclaration();
+    bool tryStatement();
+
+    void enter(int newState);
+    void leave(bool statementDone = false);
+    void correctIndentation(const QTextBlock &block);
+
+    void dump();
+
+private:
+    static QStack<State> initialState();
+
+    QPointer<QTextDocument> m_document;
+
+    QStack<State> m_beginState;
+    QStack<State> m_currentState;
+
+    QList<CPlusPlus::Token> m_tokens;
+    QString m_currentLine;
+    CPlusPlus::Token m_currentToken;
+    int m_tokenIndex;
+
+    // should store indent level and padding instead
+    int m_indentDepth;
+
+    friend class Internal::CppCodeFormatterData;
+};
+
+class CPPTOOLS_EXPORT QtStyleCodeFormatter : public CodeFormatter
+{
+public:
+    QtStyleCodeFormatter();
+
+    void setIndentSize(int size);
+
+protected:
+    virtual void onEnter(int newState, int *indentDepth, int *savedIndentDepth) const;
+    virtual void adjustIndent(const QList<CPlusPlus::Token> &tokens, int lexerState, int *indentDepth) const;
+
+private:
+    int m_indentSize;
+};
+
+} // namespace CppTools
+
+#endif // CPPCODEFORMATTER_H