class_name HankBuffer

var path: String
var cleanBuffer: String
var rawBuffer: String
var line: int
var column: int

func _init(path2: String, rawBuffer2: String, line2: int = 1, column2: int = 1) -> void:
	if (rawBuffer2 == null):
		assert(false, str("Tried to create buffer of path " + path2 + " with null contents: " + rawBuffer2))

	self.path = path2
	self.rawBuffer = rawBuffer2
	self.cleanBuffer = self.stripComments(rawBuffer2, "//", "\n", false)
	self.cleanBuffer = self.stripComments(self.cleanBuffer, "/*", "*/", true)
	self.line = line2
	self.column = column2

func lines() -> Array[String]:
	var _this: String = self.cleanBuffer
	var tempArray: Array[String] = Array(Array(_this.split("\n")), Variant.Type.TYPE_STRING, "", null)

	self.drop(self.cleanBuffer)

	return tempArray

func stripComments(s: String, o: String, c: String, dc: bool) -> String:
	while (s.find(o) != -1):
		var start: int = s.find(o)
		var end: int = s.find(c, start)
		if (end == -1):
			s = s.substr(0, start)
		else:
			if (dc):
				end += c.length()
			s = s.substr(0, start) + s.substr(end)

	return s

func indexOf(s: String, start: int = 0) -> int:
	return self.cleanBuffer.find(s, start)

func everyIndexOf(s: String) -> Array[int]:
	var _gthis: HankBuffer = self
	var tempArray

	if true:
		var _g: Array[int] = ([] as Array[int])
		if true:
			var _g1: int = 0
			var _g2: int = self.cleanBuffer.length()
			while (_g1 < _g2):
				var tempNumber
				if true:
					_g1 += 1
					tempNumber = _g1 - 1
				var i: int = tempNumber
				_g.push_back(i)
		tempArray = _g

	var temp = func(i: int) -> bool:
		return _gthis.cleanBuffer[i] == s
	var result: Array[int] = ([] as Array[int])

	if true:
		var _g: int = 0
		while (_g < tempArray.size()):
			var v: int = tempArray[_g]
			_g += 1
			if (temp.call(v)):
				result.push_back(v)

	return result

func everyRootIndexOf(s: String) -> Array[int]:
	var _gthis: HankBuffer = self
	var tempArray

	if true:
		var _g: Array[int] = ([] as Array[int])
		if true:
			var _g1: int = 0
			var _g2: Array[int] = self.everyIndexOf(s)
			while (_g1 < _g2.size()):
				var i: int = _g2[_g1]
				_g1 += 1
				_g.push_back(i)
		tempArray = _g

	var temp = func(i: int) -> bool:
		return _gthis.depthAtIndex("{", "}", i) == 0
	var result: Array[int] = ([] as Array[int])

	if true:
		var _g: int = 0
		while (_g < tempArray.size()):
			var v: int = tempArray[_g]
			_g += 1
			if (temp.call(v)):
				result.push_back(v)

	return result

func rootIndexOf(s: String) -> int:
	var start: int = 0

	while (true):
		start = self.indexOf(s, start)
		if (start == -1):
			return -1
		if (self.depthAtIndex("{", "}", start) == 0):
			return start
		start += 1

	return -1

func rootSplit(delimiter: String) -> Array[String]:
	var rootIndices: Array[int] = self.everyRootIndexOf(delimiter)

	if (rootIndices.size() == 0):
		return ([self.cleanBuffer] as Array[String])

	var substrs: Array[String] = ([] as Array[String])
	var lastIdx: int = 0
	var _g: int = 0

	while (_g < rootIndices.size()):
		var i: int = rootIndices[_g]
		_g += 1
		substrs.push_back(self.cleanBuffer.substr(lastIdx, i - lastIdx))
		lastIdx = i + 1

	substrs.push_back(self.cleanBuffer.substr(lastIdx))

	return substrs

func length() -> int:
	return self.cleanBuffer.length()

func position() -> Position:
	return Position.new(self.path, self.line, self.column)

func peekAhead(start: int, length: int) -> String:
	return self.cleanBuffer.substr(start, length)

func peekUntil(terminators: Array[String], eofTerminates: bool = false, raw: bool = false) -> Variant:
	var tempString

	if (raw):
		tempString = self.rawBuffer
	else:
		tempString = self.cleanBuffer

	var buffer: String = tempString

	if (buffer.length() == 0):
		return { "_index": 1 }

	var index: int = buffer.length()
	var whichTerminator: String = ""
	var _g: int = 0

	while (_g < terminators.size()):
		var terminator: String = terminators[_g]
		_g += 1
		var nextIndex: int = buffer.find(terminator)
		if (nextIndex != -1 && nextIndex < index):
			index = nextIndex
			whichTerminator = terminator

	var tempResult

	if (index < buffer.length() || eofTerminates):
		tempResult = { "_index": 0, "v": {
			"output": buffer.substr(0, index),
			"terminator": whichTerminator
		} }
	else:
		tempResult = { "_index": 1 }

	return tempResult

func dropRaw(s: String) -> void:
	var actual: String = self.rawBuffer.substr(0, s.length())

	if (actual != s):
		assert(false, str("Expected to drop \"" + s + "\" but was \"" + actual + "\""))

	var lines: Array[String] = Array(Array(s.split("\n")), Variant.Type.TYPE_STRING, "", null)

	if (lines.size() > 1):
		self.line += lines.size() - 1
		self.column = lines[lines.size() - 1].length() + 1
	else:
		self.column += lines[0].length()

	self.rawBuffer = self.rawBuffer.substr(s.length())

func dropClean(s: String) -> void:
	var actual: String = self.cleanBuffer.substr(0, s.length())

	if (actual != s):
		assert(false, str("Expected to drop \"" + s + "\" but was \"" + actual + "\""))

	self.cleanBuffer = self.cleanBuffer.substr(s.length())

func drop(s: String) -> void:
	var untilNextComment: Variant = self.peekUntil((["//", "/*"] as Array[String]), false, true)

	if (untilNextComment._index == 0):
		var _g: Variant = untilNextComment.v
		var _g1: String = _g.get("output")
		var _g2: String = _g.get("terminator")
		var rawS: String = _g1
		var commentOpener: String = _g2
		if (rawS.length() < s.length()):
			var tempString
			match (commentOpener):
				"/*":
					tempString = "*/"
				"//":
					tempString = "\n"
				_:
					assert(false, str("FUBAR"))
			var commentTerminator: String = tempString
			self.dropRaw(rawS + commentOpener)
			self.dropClean(rawS)
			var untilEndOfComment: Variant = self.peekUntil(([commentTerminator] as Array[String]), true, true)
			if (untilEndOfComment._index == 0):
				var _g3: Variant = untilEndOfComment.v
				var _g4: String = _g3.get("output")
				var _g5: String = _g3.get("terminator")
				var comment: String = _g4
				self.dropRaw(comment)
				if (commentTerminator != "\n"):
					self.dropRaw(commentTerminator)
				var rest: String = s.substr(rawS.length())
				self.drop(rest)
			else:
				assert(false, str("FUBAR"))
		else:
			self.dropClean(s)
			self.dropRaw(s)
	else:
		self.dropClean(s)
		self.dropRaw(s)

func takeUntil(terminators: Array[String], eofTerminates: bool = false, dropTerminator: bool = true) -> Variant:
	var tempResult

	if true:
		var _g: Variant = self.peekUntil(terminators, eofTerminates, false)
		match (_g._index):
			0:
				var _g2: Variant = _g.v
				var _g1: String = _g2.get("output")
				var _g3: String = _g2.get("terminator")
				var s: String = _g1
				var t: String = _g3
				self.drop(s)
				if (dropTerminator):
					self.drop(t)
				tempResult = { "_index": 0, "v": {
					"output": s,
					"terminator": t
				} }
			1:
				tempResult = { "_index": 1 }

	return tempResult

func peek(chars: int) -> String:
	if (self.cleanBuffer.length() < chars):
		assert(false, str("Not enough characters left in buffer."))

	var data: String = self.cleanBuffer.substr(0, chars)

	return data

func take(chars: int) -> String:
	var data: String = self.peek(chars)

	self.drop(data)

	return data

func countConsecutive(s: String) -> int:
	var num: int = 0

	while (self.cleanBuffer.substr(0, s.length()) == s):
		num += 1
		self.drop(s)

	return num

func expressionIfNext(o: String, c: String) -> Variant:
	if (StringTools.startsWith(self.cleanBuffer, o) && self.cleanBuffer.find(c) != -1):
		self.drop(o)
		var end: int = self.cleanBuffer.find(c)
		var content: String = self.take(end)
		self.drop(c)
		return { "_index": 0, "v": content }

	return { "_index": 1 }

func getLine(trimmed: String, retriever, dropNewline: bool) -> Variant:
	var nextLine: Variant = retriever.call((["\n"] as Array[String]), true, false)
	var tempResult

	match (nextLine._index):
		0:
			var _g: Variant = nextLine.v
			var _g1: String = _g.get("output")
			var _g2: String = _g.get("terminator")
			var nextLine2: String = _g1
			if (dropNewline && !self.isEmpty()):
				self.drop("\n")
			if (trimmed.find("r") != -1):
				var tempRight
				if true:
					var l: int = nextLine2.length()
					var r: int = 0
					while (r < l && StringTools.isSpace(nextLine2, l - r - 1)):
						r += 1
					if (r > 0):
						tempRight = nextLine2.substr(0, l - r)
					else:
						tempRight = nextLine2
				nextLine2 = tempRight
			if (trimmed.find("l") != -1):
				var tempRight1
				if true:
					var l: int = nextLine2.length()
					var r: int = 0
					while (r < l && StringTools.isSpace(nextLine2, r)):
						r += 1
					if (r > 0):
						tempRight1 = nextLine2.substr(r, l - r)
					else:
						tempRight1 = nextLine2
				nextLine2 = tempRight1
			tempResult = { "_index": 0, "v": nextLine2 }
		1:
			tempResult = { "_index": 1 }

	return tempResult

func peekLine(trimmed: String = "") -> Variant:
	return self.getLine(trimmed, self.peekUntil, false)

func takeLine(trimmed: String = "") -> Variant:
	return self.getLine(trimmed, self.takeUntil, true)

func skipWhitespace(terminator: String = "") -> void:
	var nextTerm: int = self.cleanBuffer.find(terminator)
	var tempString
	var s: String = self.cleanBuffer
	var l: int = s.length()
	var r: int = 0

	while (r < l && StringTools.isSpace(s, r)):
		r += 1

	if (r > 0):
		tempString = s.substr(r, l - r)
	else:
		tempString = s

	var withoutTerm: int = self.cleanBuffer.length() - (tempString).length()
	var tempNumber

	if (nextTerm <= 0):
		tempNumber = withoutTerm
	else:
		var v: float = min(nextTerm, withoutTerm)
		tempNumber = int(floor(v))

	var end: int = tempNumber
	var whitespace: String = self.cleanBuffer.substr(0, end)

	self.drop(whitespace)

func isEmpty() -> bool:
	return self.cleanBuffer.length() == 0

func depthAtIndex(o: String, c: String, index: int) -> int:
	var depth: int = 0
	var snippet: String = self.cleanBuffer.substr(0, index)
	var _g: int = 0
	var _g1: int = snippet.length()

	while (_g < _g1):
		var tempNumber
		_g += 1
		tempNumber = _g - 1
		var i: int = tempNumber
		var whichC: String = snippet[i]
		if (whichC == o):
			depth += 1
		else:
			if (whichC == c):
				depth -= 1

	return depth

func findNestedExpression(o: String, c: String, start: int = 0, throwExceptions: bool = true) -> Variant:
	var startIdx: int = start
	var endIdx: int = start
	var depth: int = 0
	var nextIdx: int = start

	while true:
		var nextOpeningIdx: int = self.cleanBuffer.find(o, nextIdx)
		var nextClosingIdx: int = self.cleanBuffer.find(c, nextIdx)
		if (nextOpeningIdx == -1 && nextClosingIdx == -1):
			return { "_index": 1 }
		else:
			if (depth == 0 && nextOpeningIdx == -1):
				if (throwExceptions):
					assert(false, str("Your input file " + self.path + " has an expression with an unmatched closing operator " + c))
				else:
					return { "_index": 1 }
			else:
				if (depth != 0 && nextClosingIdx == -1):
					if (throwExceptions):
						assert(false, str("Your input file " + self.path + " has an expression with an unmatched opening operator " + o))
					else:
						return { "_index": 1 }
				else:
					if (nextOpeningIdx != -1 && nextOpeningIdx < nextClosingIdx):
						if (depth == 0):
							startIdx = nextOpeningIdx
						depth += 1
						nextIdx = nextOpeningIdx + o.length()
					else:
						depth -= 1
						nextIdx = nextClosingIdx + c.length()
						endIdx = nextClosingIdx + c.length()
		if !(depth > 0 && nextIdx < self.cleanBuffer.length()):
			break

	return { "_index": 0, "v": BufferSlice.new(startIdx, endIdx - startIdx, self) }

static func Dummy(text: String) -> HankBuffer:
	return HankBuffer.new("_", text, 1, 1)

static func FromFile(path2: String, files = null) -> HankBuffer:
	var rawBuffer2: String = ""

	rawBuffer2 = FileAccess.open(path2, FileAccess.READ).get_as_text()

	return HankBuffer.new(path2, rawBuffer2)