110 lines
2.7 KiB
Nim
110 lines
2.7 KiB
Nim
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# line.nim
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#
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# supports multiple encodings
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# all public methods shall work the same regardless of encoding
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#
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# mx/x are volatile, they are not expected to store information long term
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import strformat
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import ../utf8
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type
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Line* = object
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content: string
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encoding: Encoding
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length: int
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x: int # real index
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mx: int # mouse index (rune index)
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# getter
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proc content*(line: Line): string =
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line.content
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proc X*(line: Line): int =
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# line.X == line.len when at complete end
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# line.X == line.high when at over the last char
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# line.X == 0 when over the first char
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line.mx
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# constructor
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proc newLine*: Line =
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Line(content: "", encoding: ecUtf8, length: 0, x: 0, mx: 0)
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proc copy*(l: Line): Line =
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Line(content: l.content, encoding: l.encoding, length: l.length, x: l.x, mx: l.mx)
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# methods
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proc insert*(line: var Line, str: string) =
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# position: x
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case line.encoding:
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of ecUtf8:
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line.length += str.runeLen
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of ecSingle:
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line.length += str.len
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if pos > line.content.high():
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line.content &= str
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elif pos == 0:
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line.content = str & line.content
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else:
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line.content = line.content[0..pos-1] & str & line.content[pos..line.content.high()]
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# TODO: x += str.len()
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proc delete(line: var Line, start: int, finish: int) =
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if start > finish or start < 0 or finish > line.content.high():
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raise newException(CatchableError, &"Invalid arguments for Line.delete: start {start}, finish {finish} for line of length {line.content.len()}")
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var result = ""
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if start > 0:
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result &= line.content[0..start-1]
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if finish < line.content.high():
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result &= line.content[finish+1..line.content.high()]
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line.content = result
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proc backspace*(line: var Line) =
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# TODO: position: x, move x
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# from multiline:
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if ml.x > 0:
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ml.lines[ml.y].backspace()
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elif ml.x == 0 and ml.y > 0:
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let cut = ml.lines[ml.y].content
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ml.lines.delete(ml.y)
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dec ml.y
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ml.x = ml.lineLen()
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ml.lines[ml.y].insert(cut, ml.x)
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# end "from multiline"
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if position == 0:
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return
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proc delete*(line: var Line) =
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# TODO: position: x
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proc navigateToMx*(line: var Line, target: mx) =
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proc left*(line: var Line) =
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proc right*(line: var Line) =
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proc home*(line: var Line) =
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proc `end`*(line: var Line) =
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#proc range*(line: var Line, start: int, finish: int): string =
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# if start > finish or start < 0 or finish > line.content.high():
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# raise newException(CatchableError, &"Invalid arguments for Line.range: start {start}, finish {finish} for line of length {line.content.len()}")
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# result = line.content[start..finish]
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proc len*(line: Line): int =
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line.length
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proc high*(line: Line): int =
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line.length - 1
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proc clearLine*(line: var Line) =
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line.content = ""
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line.length = 0
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