From 97e37bfd623ecc386cd4ccadc5f1e51f1f5d2cf9 Mon Sep 17 00:00:00 2001
From: "royqh1979@gmail.com" <Roy>
Date: Sat, 25 Sep 2021 07:51:48 +0800
Subject: [PATCH] refactor normailizedbuffercoord

---
 RedPandaIDE/RedPandaIDE.pro      |   1 +
 RedPandaIDE/editor.cpp           |  70 ++++-----
 RedPandaIDE/qsynedit/SynEdit.cpp | 106 ++++----------
 RedPandaIDE/qsynedit/SynEdit.h   |   9 +-
 RedPandaIDE/qsynedit/Types.cpp   | 235 +++++++++++++++++++++++++++++++
 RedPandaIDE/qsynedit/Types.h     |  39 ++++-
 6 files changed, 330 insertions(+), 130 deletions(-)
 create mode 100644 RedPandaIDE/qsynedit/Types.cpp

diff --git a/RedPandaIDE/RedPandaIDE.pro b/RedPandaIDE/RedPandaIDE.pro
index 8e7a168e..2c858dd2 100644
--- a/RedPandaIDE/RedPandaIDE.pro
+++ b/RedPandaIDE/RedPandaIDE.pro
@@ -39,6 +39,7 @@ SOURCES += \
     qsynedit/Search.cpp \
     qsynedit/SearchBase.cpp \
     qsynedit/SearchRegex.cpp \
+    qsynedit/Types.cpp \
     settingsdialog/compilerautolinkwidget.cpp \
     settingsdialog/debuggeneralwidget.cpp \
     settingsdialog/editorautosavewidget.cpp \
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index 55fc6f77..7a7d70db 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -2247,21 +2247,20 @@ QString Editor::getHintForFunction(const PStatement &statement, const PStatement
 void Editor::updateFunctionTip()
 {
     BufferCoord caretPos = caretXY();
-    NormalizedBufferCoord curPos = normalizeBufferPos(caretPos);
-    NormalizedBufferCoord nextPos;
+    NormalizedBufferCoord curPos = fromBufferCoord(caretPos);
     int nBraces = 0;
     int nCommas = 0;
     int FMaxScanLength = 500;
     // Find out where the function ends...
     for (int i=0;i<FMaxScanLength;i++) {
-        nextPos = moveBufferPos(curPos,1);
         // Stopping characters...
-        QChar ch = charAtNormalizedBufferPos(curPos);
-        QChar nextCh = charAtNormalizedBufferPos(nextPos);
+        QChar ch = *curPos;
         if (ch == '\0' || ch == ';') {
             return;
         // Opening brace, increase count
-        } else if (ch == '(') {
+        }
+        QChar nextCh = *(curPos+1);
+        if (ch == '(') {
             nBraces++;
           // Ending brace, decrease count or success (found ending)!
         } else if (ch == ')') {
@@ -2273,35 +2272,30 @@ void Editor::updateFunctionTip()
         } else if ((ch == '/') && (nextCh == '/')) {
             // Walk up to an enter sequence
             while (ch!='\0' && ch!='\n') {
-                curPos = nextPos;
-                nextPos = moveBufferPos(curPos,1);
-                ch = charAtNormalizedBufferPos(curPos);
-                nextCh = charAtNormalizedBufferPos(nextPos);
+                curPos+=1;
+                ch = *curPos;
             }
 
 
             // Skip linebreak;
             if (ch == '\n') {
-                curPos = nextPos;
-                nextPos = moveBufferPos(curPos,1);
+                curPos += 1;
             }
         } else if ((ch == '/') && (nextCh == '*')) {
 
             // Walk up to "*/"
             while (ch!='\0' && !(ch=='*' && nextCh=='/')) {
-                curPos = nextPos;
-                nextPos = moveBufferPos(curPos,1);
-                ch = charAtNormalizedBufferPos(curPos);
-                nextCh = charAtNormalizedBufferPos(nextPos);
+                curPos += 1;
+                ch = *curPos;
+                nextCh = *(curPos+1);
             }
 
             // Step over
             if (ch!='\0') {
-                curPos = nextPos;
-                nextPos = moveBufferPos(curPos,1);
+                curPos+=1;
             }
         } else
-            curPos = nextPos;
+            curPos += 1;
     }
 
     // If we couldn't find the closing brace or reached the FMaxScanLength...
@@ -2310,24 +2304,21 @@ void Editor::updateFunctionTip()
     }
 
     NormalizedBufferCoord FFunctionEnd = curPos;
-    NormalizedBufferCoord prevPos;
+
     // We've stopped at the ending ), start walking backwards )*here* with nBraces = -1
     for (int i=0;i<FMaxScanLength;i++) {
-        prevPos = moveBufferPos(curPos,-1);
-        QChar ch = charAtNormalizedBufferPos(curPos);
-        QChar prevCh = charAtNormalizedBufferPos(prevPos);
+        QChar ch = *curPos;
+        QChar prevCh = *(curPos-1);
         if (prevCh == '*' && ch == '/' ) {
             while (true) {
-                curPos = prevPos;
-                prevPos = moveBufferPos(curPos,-1);
-                ch = charAtNormalizedBufferPos(curPos);
-                prevCh = charAtNormalizedBufferPos(prevPos);
+                curPos -= 1;
+                ch = *(curPos);
+                prevCh = *(curPos-1);
                 if (prevCh == '\0')
                     return;
                 if (prevCh == '/' && ch == '*'  ) {
-                    curPos = prevPos;
-                    prevPos = moveBufferPos(curPos,-1);
-                    break;;
+                    curPos -= 1;
+                    break;
                 }
             }
         } else if (ch == ')') {
@@ -2340,8 +2331,8 @@ void Editor::updateFunctionTip()
             if (nBraces == 0)
                 nCommas++;
         }
-        curPos = prevPos;
-        if (curPos.Line<1)
+        curPos -= 1;
+        if (curPos.atStart())
             break;
     }
 
@@ -2353,24 +2344,21 @@ void Editor::updateFunctionTip()
     NormalizedBufferCoord FFunctionStart = curPos;
 
     // Skip blanks
-    while (curPos.Line>=1) {
-        prevPos = moveBufferPos(curPos,-1);
-        QChar prevCh = charAtNormalizedBufferPos(prevPos);
+    while (!curPos.atStart()) {
+        QChar prevCh = *(curPos-1);
         if (prevCh == '\t' || prevCh == ' '
                 || prevCh == '\n') {
-            curPos = prevPos;
+            curPos-=1;
         } else {
             break;
         }
     }
 
-    prevPos = moveBufferPos(curPos,-1);
-    if (prevPos.Line<1)
+    NormalizedBufferCoord prevPos = curPos-1;
+    if (prevPos.atStart())
         return;
     // Get the name of the function we're about to show
-    BufferCoord FuncStartXY;
-    FuncStartXY.Line = prevPos.Line;
-    FuncStartXY.Char = prevPos.Char;
+    BufferCoord FuncStartXY = prevPos.toBufferCoord();
     QString token;
     PSynHighlighterAttribute HLAttr;
     if (!getHighlighterAttriAtRowCol(FuncStartXY,token,HLAttr)) {
diff --git a/RedPandaIDE/qsynedit/SynEdit.cpp b/RedPandaIDE/qsynedit/SynEdit.cpp
index 8f15d0c7..5a5a43ab 100644
--- a/RedPandaIDE/qsynedit/SynEdit.cpp
+++ b/RedPandaIDE/qsynedit/SynEdit.cpp
@@ -699,82 +699,14 @@ BufferCoord SynEdit::displayToBufferPos(const DisplayCoord &p) const
     return Result;
 }
 
-NormalizedBufferCoord SynEdit::moveBufferPos(const BufferCoord &p, int delta) const
+NormalizedBufferCoord SynEdit::fromBufferCoord(const BufferCoord &p) const
 {
-    return normalizeBufferPos(p.Char+delta,p.Line);
-
-
+    return createNormalizedBufferCoord(p.Char,p.Line);
 }
 
-NormalizedBufferCoord SynEdit::moveBufferPos(const NormalizedBufferCoord &p, int delta) const
+NormalizedBufferCoord SynEdit::createNormalizedBufferCoord(int aChar, int aLine) const
 {
-    return normalizeBufferPos(p.Char+delta,p.Line);
-}
-
-NormalizedBufferCoord SynEdit::normalizeBufferPos(const BufferCoord &p) const
-{
-    return normalizeBufferPos(p.Char,p.Line);
-}
-
-NormalizedBufferCoord SynEdit::normalizeBufferPos(int aChar, int aLine) const
-{
-    if (mLines->count()==0) {
-        return NormalizedBufferCoord{0,0};
-    }
-    int line = aLine-1;
-    int lineCount = mLines->count();
-    if (line>=lineCount) {
-        return NormalizedBufferCoord{
-            mLines->getString(lineCount-1).length()+1
-            ,lineCount};
-    }
-    if (line<0) {
-        return NormalizedBufferCoord{0,0};
-    }
-    if (aChar<1) {
-        while (true) {
-            line--;
-            if (line < 0) {
-                return NormalizedBufferCoord{0,0};
-            }
-            QString s =mLines->getString(line);
-            int len = s.length();
-            aChar+=len+1;
-            if (aChar>=1) {
-                return NormalizedBufferCoord{aChar,line+1};
-            }
-        }
-    }
-    while (true) {
-        QString s =mLines->getString(line);
-        int len = s.length();
-        if (aChar<=len+1 ) {
-            return NormalizedBufferCoord{aChar,line+1};
-        }
-        if (line == lineCount-1) {
-            return NormalizedBufferCoord{1,lineCount+1};
-        }
-        aChar -= len+1;
-        line++;
-    }
-}
-
-QChar SynEdit::charAtNormalizedBufferPos(const NormalizedBufferCoord &p) const
-{
-    if (p.Line < 1) {
-        return QChar('\0');
-    }
-    if (p.Line > mLines->count()) {
-        return QChar('\0');
-    }
-    if (p.Char == 0) {
-        return QChar('\n');
-    }
-    QString s = mLines->getString(p.Line-1);
-    if (p.Char > p.Line+1) {
-        return QChar('\n');
-    }
-    return s[p.Char-1];
+    return NormalizedBufferCoord(this,aChar,aLine);
 }
 
 QStringList SynEdit::getContents(const NormalizedBufferCoord &pStart, const NormalizedBufferCoord &pEnd)
@@ -782,16 +714,16 @@ QStringList SynEdit::getContents(const NormalizedBufferCoord &pStart, const Norm
     QStringList result;
     if (mLines->count()==0)
         return result;
-    if (pStart.Line>0) {
-        QString s = mLines->getString(pStart.Line-1);
-        result += s.mid(pStart.Char-1);
+    if (pStart.line()>0) {
+        QString s = mLines->getString(pStart.line()-1);
+        result += s.mid(pStart.ch()-1);
     }
-    int endLine = std::min(pEnd.Line,mLines->count());
-    for (int i=pStart.Line;i<endLine-1;i++) {
+    int endLine = std::min(pEnd.line(),mLines->count());
+    for (int i=pStart.line();i<endLine-1;i++) {
         result += mLines->getString(i);
     }
-    if (pEnd.Line<=mLines->count()) {
-        result += mLines->getString(pEnd.Line-1).mid(0,pEnd.Char-1);
+    if (pEnd.line()<=mLines->count()) {
+        result += mLines->getString(pEnd.line()-1).mid(0,pEnd.ch()-1);
     }
     return result;
 }
@@ -6076,3 +6008,19 @@ void SynEdit::onScrollTimeout()
     }
     computeScroll(iMousePos.x(), iMousePos.y());
 }
+
+SynEdit::Contents::Contents(const SynEdit *edit)
+{
+    mEdit = edit;
+}
+
+QChar SynEdit::Contents::charAt(const NormalizedBufferCoord &coord) const
+{
+    Q_ASSERT(coord.edit() == mEdit);
+    return *coord;
+}
+
+QChar SynEdit::Contents::operator[](const NormalizedBufferCoord &coord) const
+{
+    return charAt(coord);
+}
diff --git a/RedPandaIDE/qsynedit/SynEdit.h b/RedPandaIDE/qsynedit/SynEdit.h
index fd0ee461..baf0fe65 100644
--- a/RedPandaIDE/qsynedit/SynEdit.h
+++ b/RedPandaIDE/qsynedit/SynEdit.h
@@ -138,8 +138,6 @@ class SynEdit : public QAbstractScrollArea
 {
     Q_OBJECT
 public:
-    explicit SynEdit(QWidget *parent = nullptr);
-
     /**
      * Returns how many rows are there in the editor
      * @return
@@ -167,11 +165,8 @@ public:
     BufferCoord displayToBufferPos(const DisplayCoord& p) const;
 
     //normalized buffer coord operations
-    NormalizedBufferCoord moveBufferPos(const BufferCoord&p, int delta) const;
-    NormalizedBufferCoord moveBufferPos(const NormalizedBufferCoord &p, int delta) const;
-    NormalizedBufferCoord normalizeBufferPos(const BufferCoord& p) const;
-    NormalizedBufferCoord normalizeBufferPos(int aChar, int aLine) const;
-    QChar charAtNormalizedBufferPos(const NormalizedBufferCoord& p) const;
+    NormalizedBufferCoord fromBufferCoord(const BufferCoord& p) const;
+    NormalizedBufferCoord createNormalizedBufferCoord(int aChar,int aLine) const;
     QStringList getContents(const NormalizedBufferCoord& pStart,const NormalizedBufferCoord& pEnd);
     QString getJoinedContents(const NormalizedBufferCoord& pStart,const NormalizedBufferCoord& pEnd, const QString& joinStr);
 
diff --git a/RedPandaIDE/qsynedit/Types.cpp b/RedPandaIDE/qsynedit/Types.cpp
new file mode 100644
index 00000000..d1dcd70d
--- /dev/null
+++ b/RedPandaIDE/qsynedit/Types.cpp
@@ -0,0 +1,235 @@
+#include "Types.h"
+#include "SynEdit.h"
+#include <QDebug>
+NormalizedBufferCoord::NormalizedBufferCoord(const SynEdit *edit, int ch, int line)
+{
+    Q_ASSERT(edit!=nullptr);
+    mEdit = edit;
+    mChar = ch;
+    mLine = line;
+    normalize();
+}
+
+void NormalizedBufferCoord::normalize()
+{
+    if (mEdit->lines()->count()==0) {
+        mChar = 0;
+        mLine = 0;
+        return;
+    }
+    int aLine = mLine;
+    int aChar = mChar;
+    int line = aLine-1;
+    int lineCount = mEdit->lines()->count();
+    if (line>=lineCount) {
+        mChar = mEdit->lines()->getString(lineCount-1).length()+1;
+        mLine = lineCount;
+        return;
+    }
+    if (line<0) {
+        mChar = 0;
+        mLine = 0;
+        return;
+    }
+    if (aChar<1) {
+        while (true) {
+            line--;
+            if (line < 0) {
+                mChar = 0;
+                mLine = 0;
+                return;
+            }
+            QString s = mEdit->lines()->getString(line);
+            int len = s.length();
+            aChar+=len+1;
+            if (aChar>=1) {
+                break;
+            }
+        }
+    } else {
+        while (true) {
+            QString s =mEdit->lines()->getString(line);
+            int len = s.length();
+            if (aChar<=len+1) {
+                break;
+            }
+            if (line == lineCount-1) {
+                mChar = 1;
+                mLine = lineCount+1;
+                return;
+            }
+            aChar -= len+1;
+            line++;
+        }
+    }
+    mChar = aChar;
+    mLine = line+1;
+    return;
+}
+
+int NormalizedBufferCoord::line() const
+{
+    return mLine;
+}
+
+void NormalizedBufferCoord::setLine(int newLine)
+{
+    mLine = newLine;
+}
+
+bool NormalizedBufferCoord::atStart()
+{
+    return mLine<1;
+}
+
+bool NormalizedBufferCoord::atEnd()
+{
+    Q_ASSERT(mEdit!=nullptr);
+    return mLine>mEdit->lines()->count();
+}
+
+const SynEdit *NormalizedBufferCoord::edit() const
+{
+    return mEdit;
+}
+
+const NormalizedBufferCoord &NormalizedBufferCoord::operator=(const NormalizedBufferCoord &coord)
+{
+    mEdit = coord.mEdit;
+    mChar = coord.mChar;
+    mLine = coord.mLine;
+    return *this;
+}
+
+const NormalizedBufferCoord &NormalizedBufferCoord::operator=(const NormalizedBufferCoord &&coord)
+{
+    if (this!=&coord) {
+        mEdit = coord.mEdit;
+        mChar = coord.mChar;
+        mLine = coord.mLine;
+    }
+    return *this;
+}
+
+bool NormalizedBufferCoord::operator==(const NormalizedBufferCoord &coord) const
+{
+    Q_ASSERT(mEdit == coord.mEdit);
+    return (mLine == coord.mLine)
+            && (mChar == coord.mChar);
+}
+
+bool NormalizedBufferCoord::operator<(const NormalizedBufferCoord &coord) const
+{
+    Q_ASSERT(mEdit == coord.mEdit);
+    return (mLine < coord.mLine) || (mLine == coord.mLine && mChar < coord.mChar);
+}
+
+bool NormalizedBufferCoord::operator<=(const NormalizedBufferCoord &coord) const
+{
+    Q_ASSERT(mEdit == coord.mEdit);
+    return (mLine < coord.mLine) || (mLine == coord.mLine && mChar <= coord.mChar);
+}
+
+bool NormalizedBufferCoord::operator>(const NormalizedBufferCoord &coord) const
+{
+    Q_ASSERT(mEdit == coord.mEdit);
+    return (mLine > coord.mLine) || (mLine == coord.mLine && mChar > coord.mChar);
+}
+
+bool NormalizedBufferCoord::operator>=(const NormalizedBufferCoord &coord) const
+{
+    Q_ASSERT(mEdit == coord.mEdit);
+    return (mLine > coord.mLine) || (mLine == coord.mLine && mChar >= coord.mChar);
+}
+
+size_t NormalizedBufferCoord::operator-(const NormalizedBufferCoord& coord) const
+{
+    Q_ASSERT(mEdit == coord.mEdit);
+    if (mLine == coord.mLine) {
+        return mChar - coord.mChar;
+    } else if (mLine > coord.mLine) {
+        size_t result = mEdit->lines()->getString(coord.mLine-1).length()+1-coord.mChar;
+        int line = coord.mLine+1;
+        while (line<=mLine-1) {
+            result += mEdit->lines()->getString(line-1).length()+1;
+            line++;
+        }
+        if (mLine<=mEdit->lines()->count()) {
+            result += mChar;
+        }
+        return result;
+    } else {
+        return coord - (*this);
+    }
+}
+
+const NormalizedBufferCoord &NormalizedBufferCoord::operator+=(int delta)
+{
+    mChar+=delta;
+    normalize();
+    return *this;
+}
+
+const NormalizedBufferCoord &NormalizedBufferCoord::operator-=(int delta)
+{
+    mChar-=delta;
+    normalize();
+    return *this;
+}
+
+BufferCoord NormalizedBufferCoord::toBufferCoord() const
+{
+    return BufferCoord{mChar,mLine};
+}
+
+NormalizedBufferCoord NormalizedBufferCoord::operator-(int delta) const
+{
+    Q_ASSERT(mEdit != nullptr);
+    return NormalizedBufferCoord(mEdit,mChar-delta,mLine);
+}
+
+NormalizedBufferCoord NormalizedBufferCoord::operator+(int delta) const
+{
+    Q_ASSERT(mEdit != nullptr);
+    return NormalizedBufferCoord(mEdit,mChar+delta,mLine);
+}
+
+QChar NormalizedBufferCoord::operator*() const
+{
+    Q_ASSERT(mEdit != nullptr);
+    if (mLine < 1) {
+        return QChar('\0');
+    }
+    if (mLine > mEdit->lines()->count()) {
+        return QChar('\0');
+    }
+    QString s = mEdit->lines()->getString(mLine-1);
+    if (mChar > s.length()+1 ) {
+        return QChar('\n');
+    }
+    return s[mChar-1];
+}
+
+NormalizedBufferCoord::NormalizedBufferCoord()
+{
+    mEdit = nullptr;
+    mLine = 0;
+    mEdit = 0;
+}
+
+NormalizedBufferCoord::NormalizedBufferCoord(const NormalizedBufferCoord &coord):
+    NormalizedBufferCoord(coord.mEdit,
+                          coord.mChar,
+                          coord.mLine)
+{
+}
+
+int NormalizedBufferCoord::ch() const
+{
+    return mChar;
+}
+
+void NormalizedBufferCoord::setCh(int newChar)
+{
+    mChar = newChar;
+}
diff --git a/RedPandaIDE/qsynedit/Types.h b/RedPandaIDE/qsynedit/Types.h
index e8ae0a88..2a39977c 100644
--- a/RedPandaIDE/qsynedit/Types.h
+++ b/RedPandaIDE/qsynedit/Types.h
@@ -12,15 +12,48 @@ struct BufferCoord {
     int Line;
 };
 
+class SynEdit;
 /**
  * Nomalized buffer posistion:
  * (0,0) means at the start of the file ('\0')
  * (1,count of lines+1) means at the end of the file ('\0')
  * (length of the line+1, line) means at the line break of the line ('\n')
  */
-struct NormalizedBufferCoord {
-    int Char;
-    int Line;
+
+class NormalizedBufferCoord {
+public:
+    NormalizedBufferCoord();
+    NormalizedBufferCoord(const NormalizedBufferCoord& coord);
+    int ch() const;
+    void setCh(int newChar);
+
+    int line() const;
+    void setLine(int newLine);
+    bool atStart();
+    bool atEnd();
+    const SynEdit *edit() const;
+    const NormalizedBufferCoord& operator=(const NormalizedBufferCoord& coord);
+    const NormalizedBufferCoord& operator=(const NormalizedBufferCoord&& coord);
+    bool operator==(const NormalizedBufferCoord& coord) const;
+    bool operator<(const NormalizedBufferCoord& coord) const;
+    bool operator<=(const NormalizedBufferCoord& coord) const;
+    bool operator>(const NormalizedBufferCoord& coord) const;
+    bool operator>=(const NormalizedBufferCoord& coord) const;
+    size_t operator-(const NormalizedBufferCoord& coord) const;
+    const NormalizedBufferCoord& operator+=(int delta);
+    const NormalizedBufferCoord& operator-=(int delta);
+    NormalizedBufferCoord operator+(int delta) const;
+    NormalizedBufferCoord operator-(int delta) const;
+    BufferCoord toBufferCoord() const;
+    QChar operator*() const;
+private:
+    NormalizedBufferCoord(const SynEdit* edit, int ch, int line);
+    void normalize();
+private:
+    int mChar;
+    int mLine;
+    const SynEdit* mEdit;
+    friend class SynEdit;
 };
 
 struct DisplayCoord {