From 8c80a1a203f0725e28ad98ed6771ad4b766cddb5 Mon Sep 17 00:00:00 2001
From: Ole Morud <olekr99@hotmail.com>
Date: Mon, 22 Aug 2022 22:37:09 +0200
Subject: [PATCH] add instruction logic

---
 src/components/Board.tsx | 245 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 213 insertions(+), 32 deletions(-)

diff --git a/src/components/Board.tsx b/src/components/Board.tsx
index a19689e..aed9f90 100644
--- a/src/components/Board.tsx
+++ b/src/components/Board.tsx
@@ -1,7 +1,15 @@
-import React, { useState } from "react"
-import { Card, CardContent, Grid, Typography } from "@mui/material"
-import instructions, { Instruction } from "../Instructions"
-import { BOARD_HEIGHT, BOARD_WIDTH, SELECTED_COLOR, SIDEBAR_WIDTH, TILE_SIZE } from "../const"
+import React, { useEffect, useState } from "react"
+import { Card, CardContent, Grid, IconButton, TextField, Typography } from "@mui/material"
+import instructions, { Instruction } from "../instructions"
+import KeyboardDoubleArrowRightIcon from "@mui/icons-material/KeyboardDoubleArrowRight"
+import {
+  BOARD_HEIGHT,
+  BOARD_WIDTH,
+  DEFAULT_TILE_COLOR,
+  SELECTED_TILE_COLOR,
+  SIDEBAR_WIDTH,
+  TILE_SIZE
+} from "../const"
 
 // considering renaming this to vector
 interface Point {
@@ -10,24 +18,32 @@ interface Point {
 }
 
 const Direction = {
-  Up: { x: -1, y: 0 },
-  Right: { x: 0, y: 1 },
-  Left: { x: 0, y: -1 },
-  Down: { x: 1, y: 0 }
+  Up: { x: 0, y: -1 },
+  Right: { x: 1, y: 0 },
+  Left: { x: -1, y: 0 },
+  Down: { x: 0, y: 1 }
 }
 
 function Board() {
   let key = 0
-
+  const [output, setOutput] = useState("")
+  const [done, setDone] = useState(true)
   const [direction, setDirection] = useState<Point>(Direction.Right)
-  const [pointer, setPointer] = useState<Point>({ x: 0, y: 0 })
-
-  // this sure is a clean readable way to initialize a 2d array
+  const [programCounter, setProgramCounter] = useState<Point>({ x: -1, y: 0 })
   const [board, setBoard] = useState<Instruction[][]>(
     new Array(BOARD_HEIGHT)
       .fill(0)
       .map(() => new Array(BOARD_WIDTH).fill(0).map(() => structuredClone(instructions[0])))
   )
+  let stringmode = false
+  const [stack, setStack] = useState<number[]>([])
+
+  useEffect(() => {
+    if (done) {
+      setProgramCounter({ x: -1, y: 0 })
+      setDirection(Direction.Right)
+    }
+  }, [done])
 
   const handleDrop = (
     col: number,
@@ -38,11 +54,13 @@ function Board() {
       console.log("invalid drop target")
       return
     }
-
+    const data = JSON.parse(event.dataTransfer.getData("instruction")) as Instruction
     const x = [...board]
-    x[row][col].symbol = event.dataTransfer.getData("text/plain")
-    console.log(x)
+    x[row][col] = data
     setBoard(x)
+
+    const target = event.target as HTMLInputElement
+    target.value = data.symbol
   }
 
   const handleOnDragOver = (event: React.DragEvent<HTMLDivElement> | undefined) => {
@@ -50,43 +68,206 @@ function Board() {
     return false
   }
 
+  const safepop = (): number => {
+    if (stack.length === 0) {
+      return 0
+    }
+
+    const x = [...stack]
+    let result = x.pop()
+    setStack(x)
+
+    if (result === undefined) {
+      result = 0
+    }
+
+    return result
+  }
+
   const iterate = () => {
+    setDone(false)
+    stepProgramCounter()
+    // This is asynchronous, the next line is run before program counter
+    // is updated. That is bad
+    console.log(board[programCounter.y][programCounter.x])
+
+    const cmd = board[programCounter.y][programCounter.x].ascii
+    let a: number
+    let b: number
+
+    if (stringmode && cmd !== '"') {
+      setStack([...stack, cmd.charCodeAt(0)])
+    } else if ("0123456789".includes(cmd)) {
+      setStack([...stack, +cmd])
+    } else {
+      switch (cmd) {
+        case "+":
+          stack.push(safepop() + safepop())
+          break
+        case "-":
+          stack.push(-safepop() + safepop())
+          break
+        case "*":
+          stack.push(safepop() * safepop())
+          break
+        case "/":
+          stack.push((1 / safepop()) * safepop())
+          break
+        case "%":
+          a = safepop()
+          b = safepop()
+          stack.push(b % a)
+          break
+        case "!":
+          stack.push(safepop() === 0 ? 1 : 0)
+          break
+        case "`":
+          stack.push(safepop() < safepop() ? 1 : 0)
+          break
+        case ">":
+          setDirection(Direction.Right)
+          break
+        case "<":
+          setDirection(Direction.Left)
+          break
+        case "^":
+          setDirection(Direction.Up)
+          break
+        case "v":
+          setDirection(Direction.Down)
+          break
+        case "?":
+          setDirection(
+            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+            [Direction.Up, Direction.Down, Direction.Left, Direction.Right].at(
+              Math.floor(Math.random() * 4)
+            )!
+          )
+          break
+        case "_":
+          setDirection(safepop() === 0 ? Direction.Right : Direction.Left)
+          break
+        case "|":
+          setDirection(safepop() === 0 ? Direction.Down : Direction.Up)
+          break
+        case '"':
+          stringmode = !stringmode
+          break
+        case ":":
+          setStack([...stack, stack[stack.length - 1]])
+          break
+        case "\\":
+          swapTopStackValues()
+          break
+        case "$":
+          safepop()
+          break
+        case ".":
+          setOutput(output + safepop())
+          break
+        case ",":
+          setOutput(output + String.fromCharCode(safepop()))
+          break
+        case "#":
+          stepProgramCounter()
+          break
+        case "g":
+          a = safepop()
+          b = safepop()
+          setStack([...stack, board[b][a].ascii.charCodeAt(0)])
+          break
+        case "p":
+          // TODO
+          break
+        case "&":
+          // TODO
+          break
+        case "~":
+          // TODO
+          break
+        case "@":
+          setDone(true)
+          break
+        default:
+          console.log("unknown command:", cmd)
+          break
+      }
+    }
+
     return null
   }
 
+  const stepProgramCounter = () => {
+    const tmp: Point = {
+      x: programCounter.x + direction.x,
+      y: programCounter.y + direction.y
+    }
+    if (tmp.x >= BOARD_WIDTH || tmp.x < 0 || tmp.y >= BOARD_HEIGHT || tmp.y < 0) {
+      setDone(true)
+      return
+    }
+    setProgramCounter(tmp)
+  }
+
+  const swapTopStackValues = () => {
+    const a = safepop()
+    const b = safepop()
+    setStack([...stack, a, b])
+  }
+
+  const handleChange = (
+    col: number,
+    row: number,
+    event: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>
+  ) => {
+    const x = [...board]
+    x[row][col].symbol = event.target.value
+    setBoard(x)
+  }
+
   return (
     <div style={{ marginLeft: `${SIDEBAR_WIDTH + 1}rem` }}>
+      {/* BUTTON PANEL */}
+      <div style={{ display: "flex" }}>
+        <IconButton onClick={() => iterate()}>
+          <KeyboardDoubleArrowRightIcon />
+        </IconButton>
+        <Typography>stack: {JSON.stringify(stack)}</Typography>
+      </div>
+
+      {/* BOARD */}
       {board.map((row, rowNo): JSX.Element => {
         return (
           <Grid key={key++} container columns={BOARD_WIDTH} sx={{ width: `${5 * 12}rem` }}>
-            {row.map((element, colNo): JSX.Element => {
+            {row.map((tile, colNo): JSX.Element => {
               return (
                 <div
                   style={{
                     textAlign: "center",
-                    margin: "auto",
-                    verticalAlign: "middle"
+                    margin: "auto"
                   }}
-                  key={key++}
-                  onDragOver={handleOnDragOver}
-                  onDrop={(event) => handleDrop(colNo, rowNo, event)}>
+                  key={key++}>
                   <Card
                     sx={{
                       height: `${TILE_SIZE}rem`,
                       width: `${TILE_SIZE}rem`,
                       margin: 1,
-                      color:
-                        rowNo === pointer.x && colNo === pointer.y ? SELECTED_COLOR : "0xFFFFFF"
+                      bgcolor:
+                        rowNo === programCounter.y && colNo === programCounter.x
+                          ? SELECTED_TILE_COLOR
+                          : DEFAULT_TILE_COLOR
                     }}>
-                    <CardContent
-                      sx={{
-                        display: "inline",
-                        float: "none",
-                        margin: "auto"
-                      }}>
-                      <Typography sx={{ mt: "10%" }} variant="body1">
-                        {element.symbol}
-                      </Typography>
+                    <CardContent>
+                      <TextField
+                        sx={{ mt: "10%" }}
+                        variant="standard"
+                        inputProps={{ maxLength: 1 }}
+                        onChange={(event) => handleChange(colNo, rowNo, event)}
+                        onDragOver={handleOnDragOver}
+                        onDrop={(event) => {
+                          handleDrop(colNo, rowNo, event)
+                        }}
+                      />
                     </CardContent>
                   </Card>
                 </div>