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#include <stdexcept>
#include <fstream>
#include <cassert>
#include <cmath>
#include <termio.h>
#include "buffer.h"
#include "manager.h"
#include "throw.h"
using namespace std;
Buffer::Buffer(Manager *manager)
:manager(manager){}
void Buffer::receive(const Command &cmd){
if(cmd[0]=="open_file"){
const string &fname=cmd[1];
filename=fname;
ifstream file(fname);
if(!file){
manager->receive({"error","Cannot open file '"+fname+"'"});
return;
}
tb.read(file);
} else if(cmd[0]=="insert_char"){
char c=cmd[1][0];
if(c=='\n'){
assert(false);
} else {
tb.insert(cursor.line,cursor.x,cmd[1][0]);
cursor.x++;
}
//TODO: optimise this
renewLayout(screen[0].line,screen[0].part,lastWidth,lastHeight);
} else {
THROW("Unknown command");
}
}
static string showChar(char c){
if(c>=32&&c<127)return {c};
return {'\\','x',
"0123456789abcdef"[(unsigned char)c/16],
"0123456789abcdef"[(unsigned char)c%16]};
}
/*static i64 charWidth(char c){
return showChar(c).size();
}*/
vector<Buffer::ScreenLine> Buffer::layoutLine(const string &line,i64 linenum,i64 width){
assert(width>=4);
vector<ScreenLine> layout;
vector<Cell> cur;
i64 x=0;
i64 linepart=0,fromx=0;
for(i64 i=0;i<(i64)line.size();i++){
char c=line[i];
string repr=showChar(c);
assert(repr.size()>0);
if(x+(i64)repr.size()>=width){
layout.push_back({linenum,linepart,fromx,move(cur)});
cur.clear();
linepart++;
fromx=i;
x=0;
}
Cell cell={'\0',repr.size()!=1};
for(char rc : repr){
cell.c=rc;
cur.push_back(cell);
x++;
}
}
if(cur.size()>0)layout.push_back({linenum,linepart,fromx,move(cur)});
return layout;
}
//Takes width without gutter
void Buffer::performInitialLayout(i64 width,i64 height){
assert(width>0&&height>0);
const i64 targetCursorScreenY=height/2;
screen.clear();
if(tb.numLines()==0){
screen.push_back({0,0,0,{}});
return;
}
assert(cursor.line>=0&&cursor.x>=0&&
cursor.line<tb.numLines()&&cursor.x<=tb.lineLen(cursor.line));
//Layout the line the cursor is on.
screen=layoutLine(tb[cursor.line],cursor.line,width);
i64 cursorScreenY=0;
while(cursorScreenY+1<(i64)screen.size()&&screen[cursorScreenY+1].fromx>cursor.x){
cursorScreenY++;
}
//First, layout lines above the cursor line until the cursor is at or past halfway
//the screen, or the buffer is exhausted.
i64 topLine=cursor.line-1; //logical line
while(topLine>=0&&cursorScreenY<targetCursorScreenY){
vector<ScreenLine> layout=layoutLine(tb[topLine],topLine,width);
screen.insert(screen.begin(),layout.begin(),layout.end());
cursorScreenY+=layout.size();
topLine--;
}
//Remove any lines from the top until the cursor is exactly halfway the screen.
//Store the removed lines in `spliced`.
vector<ScreenLine> spliced;
if(cursorScreenY>targetCursorScreenY){
for(i64 i=0;i<cursorScreenY-targetCursorScreenY;i++){
spliced.push_back(move(screen[i]));
}
screen.erase(screen.begin(),screen.begin()+(cursorScreenY-targetCursorScreenY));
}
//Then, layout lines *under* the cursor line until the screen is full, or the buffer is
//exhausted.
i64 bottomLine=cursor.line+1; //logical line
while(bottomLine<tb.numLines()&&(i64)screen.size()<height){
vector<ScreenLine> layout=layoutLine(tb[bottomLine],bottomLine,width);
screen.insert(screen.end(),layout.begin(),layout.end());
bottomLine++;
}
if((i64)screen.size()<height){
//Oops, we overran a bit. Prune the end so that we fill the screen exactly.
screen.resize(height);
} else if((i64)screen.size()<height){
//We didn't even manage to fill the whole screen. Try to fill up the gap, first with the
//lines in `spliced`, and then with extra logical lines from the textblob.
i64 endgap=height-screen.size();
if(endgap<=(i64)spliced.size()){
//`spliced` contains enough lines to fill the gap.
screen.insert(screen.begin(),spliced.begin()+(spliced.size()-endgap),spliced.end());
} else {
//We'll have to pull in some more lines from the textblob.
screen.insert(screen.begin(),spliced.begin(),spliced.end());
while(topLine>=0&&(i64)screen.size()<height){
vector<ScreenLine> layout=layoutLine(tb[topLine],topLine,width);
screen.insert(screen.begin(),layout.begin(),layout.end());
topLine--;
}
if((i64)screen.size()>height){
//Oops, we overran a bit. Prune the end so that we fill the screen exactly.
screen.resize(height);
}
}
}
}
//Takes width without gutter
void Buffer::renewLayout(i64 topLine,i64 topPart,i64 width,i64 height){
assert(width>0&&height>0);
assert(topLine>=0&&topPart>=0);
screen.clear();
if(tb.numLines()==0){
screen.push_back({0,0,0,{}});
return;
}
screen=layoutLine(tb.getLine(topLine),topLine,width);
if(topPart>0)screen.erase(screen.begin(),screen.begin()+topPart);
i64 bottomLine=topLine+1;
while(bottomLine<tb.numLines()&&(i64)screen.size()<height){
vector<ScreenLine> layout=layoutLine(tb[bottomLine],bottomLine,width);
screen.insert(screen.begin(),layout.begin(),layout.end());
bottomLine++;
}
if((i64)screen.size()>height){
screen.resize(height);
}
}
i64 numberWidth(i64 number){
if(number<0)return 1+numberWidth(-number);
if(number==0)return 1;
return (i64)log10(number)+1;
}
void Buffer::show(i64 atx,i64 aty,i64 width,i64 height){
static const Style gutterStyle={3,9,false,false};
static const Style textStyle={9,9,false,false};
static const Style specialStyle={5,9,false,false};
i64 gutterWidth=numberWidth(tb.numLines())+2;
i64 newWidth=width-gutterWidth;
if(newWidth!=lastWidth||height!=lastHeight){
if(lastWidth==-1)performInitialLayout(newWidth,height);
else renewLayout(screen[0].line,screen[0].part,newWidth,height);
lastWidth=newWidth;
lastHeight=height;
}
pushcursor();
i64 y;
for(y=0;y<(i64)screen.size();y++){
moveto(atx,aty+y);
setstyle(&gutterStyle);
i64 nspaces=gutterWidth-1-numberWidth(screen[y].line+1);
for(i64 i=0;i<nspaces;i++){
tputc(' ');
}
tprintf("%lld ",screen[y].line+1);
setstyle(&textStyle);
for(const Cell &cell : screen[y].cells){
if(cell.special)setstyle(&specialStyle);
else setstyle(&textStyle);
tputc(cell.c);
}
}
setstyle(&textStyle);
if(y<height)fillrect(atx,aty+y,width,height-y,' ');
}
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