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RochesterX
2026-04-04 15:35:28 -04:00
parent db77330754
commit 11b6b0d058
1 changed files with 196 additions and 39 deletions
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231
Sources/A-Star/A_Star.swift
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@@ -1,3 +1,5 @@
import Foundation
#if os(macOS)
import Darwin
#elseif os(Linux)
@@ -10,36 +12,34 @@ import ucrt
@main
struct A_Star {
static func main() {
print("\u{1B}[2J", terminator: "")
print("\u{1B}[H", terminator: "")
// From https://patorjk.com/software/taag
print(#"""
$$$$$$\ $$$$$$\ $$\ $$\
$$ __$$\ $$\$$\ $$ __$$\ $$ |$$ |
$$ / $$ | \$$$ | $$ / \__| $$$$$$\ $$$$$$$\ $$$$$$$ |$$$$$$$\ $$$$$$\ $$\ $$\
$$$$$$$$ |$$$$$$$\ \$$$$$$\ \____$$\ $$ __$$\ $$ __$$ |$$ __$$\ $$ __$$\ \$$\ $$ |
$$ __$$ |\_$$$ __| \____$$\ $$$$$$$ |$$ | $$ |$$ / $$ |$$ | $$ |$$ / $$ | \$$$$ /
$$ | $$ | $$ $$\ $$\ $$ |$$ __$$ |$$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ | $$ $$<
$$ | $$ | \__\__| \$$$$$$ |\$$$$$$$ |$$ | $$ |\$$$$$$$ |$$$$$$$ |\$$$$$$ |$$ /\$$\
\__| \__| \______/ \_______|\__| \__| \_______|\_______/ \______/ \__/ \__|
var initfilePath = "-"
var noInteract = false
Welcome to the A* Sandbox, an interactive terminal-based visualizer for the A* graph traversal
algorithm. You can enter a width and height for the grid, then use the following controls to
experiment with the algorithm. The optimal path will refresh every time you make a change to
the grid.
if CommandLine.arguments.count == 2 {
initfilePath = CommandLine.arguments[1]
} else if CommandLine.arguments.count == 3 && CommandLine.arguments[2] == "--nointeract" {
initfilePath = CommandLine.arguments[1]
noInteract = true
} else if (CommandLine.arguments.count != 1) {
print("""
Improper syntax.
Controls:
- Cursor movement: WASD, HJKL, or Arrow Keys
- Place wall: Space
- Place start: [
- Place goal: ]
- Restrict valid movement options: number keys (directions based on number pad)
Usage:
binary-path [initfile-path [--nointeract]]
"""#)
print("Enter the grid width: ", terminator: "")
let width: Int = Int(readLine() ?? "") ?? 16
print("Enter the grid height: ", terminator: "")
let height: Int = Int(readLine() ?? "") ?? 8
Example:
./A-Star Tests/Test1 --nointeract
""")
return
}
var grid: [[Int]] = [[]]
var start: Vector2 = Vector2(x: -1, y: -1)
var goal: Vector2 = Vector2(x: -1, y: -1)
parseInitfile(initfilePath, grid: &grid, start: &start, goal: &goal)
// Hide cursor
print("\u{1B}[?25l")
Terminal.enableRawMode()
@@ -47,17 +47,27 @@ Controls:
var cursorPosition = Vector2(x: 0, y: 0)
defer {
quit()
quit(clear: !noInteract)
}
var grid: [[Int]] = Array(repeating: Array(repeating: 0, count: width), count: height)
var start: Vector2 = Vector2(x: 0, y: 0)
var goal: Vector2 = Vector2(x: width - 1, y: 0)
var aStar = A_Star()
var path = aStar.pathfind(grid: grid, start: start, goal: goal)
if noInteract {
aStar.display(path, on: grid)
// If noInteract, print full path
print("\nFull path: ")
for vector in path {
let index = path.firstIndex(of: vector)!
print("(\(vector.x), \(vector.y))\(index != path.count - 1 ? (index % 5 == 4 ? " ⏎ " : " → ") : "")\(index % 5 == 4 ? "\n" : "")", terminator: "")
}
print()
quit(clear: false)
}
while true {
aStar.display(path, on: grid, cursorPosition: cursorPosition)
let key = Terminal.readKey()
@@ -73,7 +83,7 @@ Controls:
default:
switch key {
case .Quit:
quit()
quit(clear: true)
case .Start:
start = cursorPosition
case .Finish:
@@ -210,7 +220,7 @@ Controls:
return tentativeLowest
}
func display(_ path: [Vector2], on: [[Int]], cursorPosition: Vector2) {
func display(_ path: [Vector2], on: [[Int]], cursorPosition: Vector2 = Vector2(x: -1, y: -1)) {
let draw: Dictionary<String, String> = [
"nw": "┏",
"ne": "┓",
@@ -319,6 +329,136 @@ Controls:
print(output)
}
static func parseInitfile(_ initfilePath: String, grid: inout [[Int]], start: inout Vector2, goal: inout Vector2) {
if initfilePath != "-" {
do {
let fileURL = URL(fileURLWithPath: initfilePath)
let text = try String(contentsOf: fileURL, encoding: .utf8)
var starts = 0
var goals = 0
grid = text.split(whereSeparator: \.isNewline).enumerated().map({ y, line in
return line.enumerated().map({ x, char in
if char == "S" {
starts += 1
start = Vector2(x: x, y: y)
}
else if char == "F" {
goals += 1
goal = Vector2(x: x, y: y)
}
return char == "#" ? 1 : 0
})
})
if starts == 0 {
throw InitfileError.missingStart
} else if goals == 0 {
throw InitfileError.missingGoal
}
if starts != 1 {
throw InitfileError.multipleStarts
} else if goals != 1 {
throw InitfileError.multipleGoals
}
if grid.count == 0 || grid[0].count == 0 { throw InitfileError.emptyFile }
for row in grid {
if row.count != grid[0].count {
throw InitfileError.unevenRowLengths
}
}
return
} catch InitfileError.missingStart {
print("No start symbol \"S\" found in initfile.\nPress enter to continue...")
_ = readLine()
} catch InitfileError.missingGoal {
print("No goal symbol \"F\" found in initfile.\nPress enter to continue...")
_ = readLine()
} catch InitfileError.multipleStarts {
print("Multiple start symbols (\"S\") found in initfile.\nPress enter to continue...")
_ = readLine()
} catch InitfileError.multipleGoals {
print("Multiple goal symbols (\"F\") found in initfile.\nPress enter to continue...")
_ = readLine()
} catch InitfileError.emptyFile {
print("Initfile is empty.\nPress enter to continue...")
_ = readLine()
} catch InitfileError.unevenRowLengths {
print("Uneven row lengths in initfile.\nPress enter to continue...")
_ = readLine()
} catch {
print("Error processing initfile.\nPress enter to continue...")
_ = readLine()
}
}
// Clear screen and go home
print("\u{1B}[2J", terminator: "")
print("\u{1B}[H", terminator: "")
// From https://patorjk.com/software/taag
print(#"""
$$$$$$\ $$$$$$\ $$\ $$\
$$ __$$\ $$\$$\ $$ __$$\ $$ |$$ |
$$ / $$ | \$$$ | $$ / \__| $$$$$$\ $$$$$$$\ $$$$$$$ |$$$$$$$\ $$$$$$\ $$\ $$\
$$$$$$$$ |$$$$$$$\ \$$$$$$\ \____$$\ $$ __$$\ $$ __$$ |$$ __$$\ $$ __$$\ \$$\ $$ |
$$ __$$ |\_$$$ __| \____$$\ $$$$$$$ |$$ | $$ |$$ / $$ |$$ | $$ |$$ / $$ | \$$$$ /
$$ | $$ | $$ $$\ $$\ $$ |$$ __$$ |$$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ | $$ $$<
$$ | $$ | \__\__| \$$$$$$ |\$$$$$$$ |$$ | $$ |\$$$$$$$ |$$$$$$$ |\$$$$$$ |$$ /\$$\
\__| \__| \______/ \_______|\__| \__| \_______|\_______/ \______/ \__/ \__|
Welcome to the A* Sandbox, an interactive terminal-based visualizer for the A* graph traversal
algorithm. You can enter a width and height for the grid, then use the following controls to
experiment with the algorithm. The optimal path will refresh every time you make a change to
the grid.
Controls:
- Cursor movement: WASD, HJKL, or Arrow Keys
- Place wall: Space
- Place start: [
- Place goal: ]
- Restrict valid movement options: number keys (directions based on number pad)
"""#)
print("Enter the grid width: ", terminator: "")
let width: Int = Int(readLine() ?? "") ?? 16
print("Enter the grid height: ", terminator: "")
let height: Int = Int(readLine() ?? "") ?? 8
grid = Array(repeating: Array(repeating: 0, count: width), count: height)
start = Vector2(x: 0, y: 0)
goal = Vector2(x: width - 1, y: 0)
}
static func noUI(_ path: String) {
do {
let fileURL = URL(fileURLWithPath: path)
let text = try String(contentsOf: fileURL, encoding: .utf8)
var start: Vector2 = Vector2(x: 0, y: 0)
var goal: Vector2 = Vector2(x: 0, y: 0)
let grid = text.split(whereSeparator: \.isNewline).enumerated().map({ y, line in
return line.enumerated().map({ x, char in
if char == "S" { start = Vector2(x: x, y: y) }
else if char == "F" { goal = Vector2(x: x, y: y) }
return char == "#" ? 1 : 0
})
})
let aStar = A_Star()
let path = aStar.pathfind(grid: grid, start: start, goal: goal)
aStar.display(path, on: grid)
} catch {
print("Error processing input file.")
}
}
static func clamp(_ value: Int, low: Int, high: Int) -> Int {
if value < low {
return low
@@ -448,7 +588,7 @@ struct Terminal {
rawTerm.c_lflag &= ~tcflag_t(ICANON | ECHO)
tcsetattr(STDIN_FILENO, TCSANOW, &rawTerm)
signal(SIGINT, quit)
signal(SIGINT, quitHandler)
#endif
}
@@ -459,13 +599,21 @@ struct Terminal {
}
}
func quit(_ signal: Int32 = 0) {
func quitHandler(_ signal: Int32) {
quit(clear: true)
}
func quit(clear: Bool = true) {
Terminal.disableRawMode()
// Show cursor
print("Exit")
print("\u{1B}[?25h", terminator: "")
// Clear + return home
if clear {
print("\u{1B}[2J", terminator: "")
print("\u{1B}[H", terminator: "")
}
exit(0)
}
@@ -499,3 +647,12 @@ struct Color {
static let Default = "\u{1B}[39m"
}
enum InitfileError: Error {
case emptyFile
case missingStart
case missingGoal
case multipleStarts
case multipleGoals
case unevenRowLengths
}