// virtual void SCI_METHOD Fold(Sci_PositionU startPos, i64 lengthDoc, int initStyle, IDocument *pAccess) = 0;
public static void Fold(IntPtr instance, UIntPtr start_pos, IntPtr length_doc, int init_style, IntPtr p_access)
{
/*
* is called with the exact range that needs folding.
* Previously, lexers were called with a range that started one line
* before the range that needs to be folded as this allowed fixing up
* the last line from the previous folding.
* The new approach allows the lexer to decide whether to backtrack
* or to handle this more efficiently.
*
* Lessons I have learned so far are
* - do not start with a base level of 0 to simplify the arithmetic int calculation
* - scintilla recommends to use 0x400 as a base level
* - when the value becomes smaller than the base value, set the base value
* - create an additional margin in which you set the levels of the respective lines,
* so it is easy to see when something breaks.
*/
int length = (int)length_doc;
int start = (int)start_pos;
// allocate a buffer
IntPtr buffer_ptr = Marshal.AllocHGlobal(length);
if (buffer_ptr == IntPtr.Zero)
{
return;
}
IDocument idoc = (IDocument)Marshal.PtrToStructure(p_access, typeof(IDocument));
IDocumentVtable vtable = (IDocumentVtable)Marshal.PtrToStructure((IntPtr)idoc.VTable, typeof(IDocumentVtable));
// scintilla fills the allocated buffer
vtable.GetCharRange(p_access, buffer_ptr, (IntPtr)start, (IntPtr)length);
if (buffer_ptr == IntPtr.Zero)
{
return;
}
// convert the buffer into a managed string
string content = Marshal.PtrToStringAnsi(buffer_ptr, length);
int cur_level = (int)SciMsg.SC_FOLDLEVELBASE;
int cur_line = (int)vtable.LineFromPosition(p_access, (IntPtr)start);
if (cur_line > 0)
{
int prev_level = (int)vtable.GetLevel(p_access, (IntPtr)(cur_line - 1));
bool header_flag_set = (prev_level & (int)SciMsg.SC_FOLDLEVELHEADERFLAG) == (int)SciMsg.SC_FOLDLEVELHEADERFLAG;
if (header_flag_set)
{
cur_level = (prev_level & (int)SciMsg.SC_FOLDLEVELNUMBERMASK) + 1;
}
else
{
cur_level = (prev_level & (int)SciMsg.SC_FOLDLEVELNUMBERMASK);
}
}
int next_level = cur_level;
for (int i = 0; i < length; i++)
{
if (!SupportedProperties["fold"])
{
vtable.SetLevel(p_access, (IntPtr)cur_line, (int)SciMsg.SC_FOLDLEVELBASE);
while (i < length)
{
// read rest of the line
if (content[i] == '\n')
{
break;
}
i++;
}
cur_line++;
continue;
}
string tag = "";
if (i + 2 < length)
{
tag = content.Substring(i, 3);
}
if (FoldOpeningTags.Contains(tag))
{
next_level++;
cur_level |= (int)SciMsg.SC_FOLDLEVELHEADERFLAG;
}
else if (FoldClosingTags.Contains(tag))
{
next_level--;
if (SupportedProperties["fold.compact"])
{
cur_level--;
}
cur_level &= (int)SciMsg.SC_FOLDLEVELNUMBERMASK;
}
else
{
cur_level &= (int)SciMsg.SC_FOLDLEVELNUMBERMASK;
}
while (i < length)
{
// read rest of the line
if (content[i] == '\n')
{
break;
}
i++;
}
// set fold level
if (cur_level < (int)SciMsg.SC_FOLDLEVELBASE)
{
cur_level = (int)SciMsg.SC_FOLDLEVELBASE;
}
vtable.SetLevel(p_access, (IntPtr)cur_line, cur_level);
cur_line++;
cur_level = next_level;
}
// free allocated buffer
Marshal.FreeHGlobal(buffer_ptr);
}
// virtual void SCI_METHOD Lex(Sci_PositionU startPos, i64 lengthDoc, int initStyle, IDocument *pAccess) = 0;
public static void Lex(IntPtr instance, UIntPtr start_pos, IntPtr length_doc, int init_style, IntPtr p_access)
{
/* main lexing method.
* start_pos is always the startposition of a line
* length_doc is NOT the total length of a document but the size of the text to be styled
* init_style is the style of last styled byte
* p_access is the pointer of the IDocument cpp class
*/
int length = (int)length_doc;
int start = (int)start_pos;
bool bHighlight = SupportedProperties["highlightnumeric"];
//bool bHighlight = true;
// allocate a buffer
IntPtr buffer_ptr = Marshal.AllocHGlobal(length);
if (buffer_ptr == IntPtr.Zero)
{
return;
}
// create the IDocument interface (struct) from the provided p_access pointer
IDocument idoc = (IDocument)Marshal.PtrToStructure(p_access, typeof(IDocument));
// create/simulate the vtable of the IDocument interface
IDocumentVtable vtable = (IDocumentVtable)Marshal.PtrToStructure((IntPtr)idoc.VTable, typeof(IDocumentVtable));
// scintilla fills the allocated buffer
vtable.GetCharRange(p_access, buffer_ptr, (IntPtr)start, (IntPtr)length);
if (buffer_ptr == IntPtr.Zero)
{
return;
}
// convert the buffer into a managed string
string content = Marshal.PtrToStringAnsi(buffer_ptr, length);
for (int i = 0; i < length; i++)
{
int start_position = i;
string tag = "";
int idx = 0;
bool num = false;
bool dot = false;
int start_num = -1;
if (i + 2 < length)
{
tag = content.Substring(i, 3);
}
if (Segs1.Contains(tag))
{
idx = 1;
}
else if (Segs2.Contains(tag))
{
idx = 2;
}
else if (Segs3.Contains(tag))
{
idx = 3;
}
else if (Segs4.Contains(tag))
{
idx = 4;
}
while (i < length)
{
// highlight numeric values
if (bHighlight)
{
if (num && (content[i] == '.'))
{
dot = true;
}
else if (!num && (content[i] >= '0') && (content[i] <= '9'))
{
num = true;
start_num = i;
}
else if ((content[i] < '0') || (content[i] > '9'))
{
if (num && dot)
{
// style up until numeric
vtable.StartStyling(p_access, (IntPtr)(start + start_position));
vtable.SetStyleFor(p_access, (IntPtr)(start_num - start_position), (char)idx);
// style numeric highlight
vtable.StartStyling(p_access, (IntPtr)(start + start_num));
vtable.SetStyleFor(p_access, (IntPtr)(i - start_num), (char)9); // 9 = highlight numeric
// new start position after numeric
start_position = i;
}
// reset
num = false;
dot = false;
}
}
// read rest of the line
if (content[i] == '\n')
{
break;
}
i++;
}
// let scintilla style this line
vtable.StartStyling(p_access, (IntPtr)(start + start_position));
vtable.SetStyleFor(p_access, (IntPtr)(i - start_position), (char)idx);
}
// free allocated buffer
Marshal.FreeHGlobal(buffer_ptr);
}