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package field
func (f *Field) Blank(x, y int) {
if !f.isIn(x, y) {
// outside the field, nothing to do
return
}
l := &f.lines[y-f.y]
if x < l.x || x >= l.x+l.l {
// outside the current line's columns
return
}
if x > l.x && x < l.x+l.l-1 {
// just set the value
l.columns[x-l.x] = ' '
return
}
// do we need to trim this line?
if l.l == 1 {
// this was the last character on the line
if y == f.y {
// We need to trim the leading lines
leadingLines := 1
for i := 1; i < f.ly; i++ {
if f.lines[i].l == 0 {
leadingLines++
} else {
break
}
}
f.y += leadingLines
f.ly -= leadingLines
lines := make([]Line, f.ly)
for i := 0; i < f.ly; i++ {
lines[i] = f.lines[leadingLines+i]
}
f.lines = lines
} else if y == f.y+f.ly-1 {
// We need to trim the trailing lines
trailingLines := 1
for i := f.ly + f.y - 2; i >= 0; i-- {
if f.lines[i].l == 0 {
trailingLines++
} else {
break
}
}
f.ly -= trailingLines
f.lines = f.lines[:f.ly]
} else {
// it was a line in the middle
l.l = 0
l.columns = make([]int, 0)
}
} else if x == l.x {
// We need to remove leading spaces
leadingSpaces := 1
for i := 1; i < l.l; i++ {
if l.columns[i] == ' ' {
leadingSpaces++
} else {
break
}
}
l.x += leadingSpaces
l.l -= leadingSpaces
columns := make([]int, l.l)
for i := 0; i < l.l; i++ {
columns[i] = l.columns[leadingSpaces+i]
}
l.columns = columns
} else if x == l.l+l.x-1 {
// we need to remove trailing spaces
trailingSpaces := 1
for i := l.l - 2; i >= 0; i-- {
if l.columns[i] == ' ' {
trailingSpaces++
} else {
break
}
}
l.l -= trailingSpaces
l.columns = l.columns[:l.l]
}
// we now need to find the new field limits
f.x = f.lines[0].x
x2 := f.lines[0].l + f.lines[0].x
for i := 1; i < f.ly; i++ {
if f.x > f.lines[i].x {
f.x = f.lines[i].x
}
if x2 < f.lines[i].x+f.lines[i].l {
x2 = f.lines[i].x + f.lines[i].l
}
}
f.lx = x2 - f.x
}
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