X-Git-Url: https://git.kengrimes.com/?p=watForth.git;a=blobdiff_plain;f=forth.js;fp=forth.js;h=3dbfc2b78daef434efcb2b2c8e97ebd61927e25a;hp=9c0e58d2dc57e8128b67b3295ebe37fbec366d6a;hb=fb7946e17777ee389e3eaf742e6ff87a5d832710;hpb=94d40c7e5521898acd394ca7a3e30cf20065ee5c

diff --git a/forth.js b/forth.js
index 9c0e58d..3dbfc2b 100644
--- a/forth.js
+++ b/forth.js
@@ -11,12 +11,202 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 'use strict'
-const initialize = Promise.all([
+
+/* State */
+const output = {
+  print: (string) => {},
+  updateViews: () => {}
+}
+const channels = []
+let wasmMem, forth
+
+/* Init */
+Promise.all([
   fetch('forth.forth', {credentials: 'include', headers:{'content-type':'text/plain'}}).then((re) => re.text()),
   fetch('forth.wasm', {credentials: 'include', headers:{'content-type':'application/wasm'}}).then(re => re.arrayBuffer())
-])
+]).then((results) => {
+  WebAssembly.instantiate(results[1], wasmImport).then((module) => {
+    wasmMem = module.instance.exports.memory.buffer
+    forth = (chno, data) => {
+      if (typeof chno !== "number") {
+        data = chno
+        chno = 0
+      }
+      channels[chno].writeEnv(data)
+      if (chno === 0)
+        output.print(data)
+      module.instance.exports.main(chno)
+      output.updateViews()
+    }
+    console.log('wasm loaded')
+    forth(results[0])
+  })
+})
+
+/* Environment functions */
+const wasmString = (addr, u) =>
+  String.fromCharCode.apply(
+    null,
+    new Uint16Array(wasmMem, addr, u >> 1)
+  )
+const strToArrayBuffer = (str) => {
+  const buf = new ArrayBuffer(str.length << 1);
+  const bufView = new Uint16Array(buf);
+  for (let i = 0, strLen = str.length; i < strLen; i++)
+    bufView[i] = str.charCodeAt(i);
+  return buf;
+}
+const bufJoin = (buf1, buf2) => {
+  const newBuf = new Uint8Array(buf1.byteLength + buf2.byteLength)
+  newBuf.set(new Uint8Array(buf1), 0)
+  newBuf.set(new Uint8Array(buf2), buf1.byteLength)
+  return newBuf.buffer
+}
+
+/* I/O Channel Drivers */
+class Channel {
+  constructor(opt) {
+    opt.chno = channels.indexOf(undefined)
+    if (opt.chno === -1)
+      opt.chno = channels.length
+    Object.assign(this, opt)
+    if (this.buffer === undefined)
+      this.buffer = new ArrayBuffer(0)
+    channels[this.chno] = this
+    return this
+  }
+  read(writeAddr, maxBytes) {
+    const wasmView = new Uint8Array(wasmMem, writeAddr, maxBytes)
+    const bufBytes = Math.min(maxBytes, this.buffer.byteLength)
+    const bufView = new Uint8Array(this.buffer, 0, bufBytes)
+    wasmView.set(bufView, 0)
+    this.buffer = this.buffer.slice(bufBytes)
+    return bufBytes
+  }
+  write(readAddr, maxBytes) {
+      const newBuf = new Uint8Array(this.buffer.byteLength + maxBytes)
+      newBuf.set(new Uint8Array(this.buffer), 0)
+      newBuf.set(new Uint8Array(wasmMem, readAddr, maxBytes), this.buffer.byteLength)
+      this.buffer = newBuf
+  }
+  writeEnv(data) {
+    switch (typeof data) {
+    case "string":
+      this.buffer = bufJoin(this.buffer, strToArrayBuffer(data))
+      break
+    case "object" :
+      if (data instanceof ArrayBuffer)
+        this.buffer = bufJoin(this.buffer, data)
+      else
+        this.buffer = bufJoin(this.buffer, strToArrayBuffer(JSON.stringify(data)))
+      break
+    case "number" :
+      const buf = new ArrayBuffer(4)
+      new DataView(buf, 0, 4).setInt32(data)
+      this.buffer = bufJoin(this.buffer, buf)
+      break
+    default :
+      console.error(`environment wrote unhandled object: ${data}`)
+      return
+    }
+  }
+}
+/* 0 STDIN, 1 STDOUT, 2 STDERR */
+new Channel({
+  write(readAddr, maxBytes) {
+    super.write(readAddr, maxBytes)
+    output.print(wasmString(readAddr, maxBytes))
+  }
+})
+new Channel({
+  read(writeAddr, maxBytes) { return 0 },
+  write(readAddr, maxBytes) { output.print(`\\\ => ${wasmString(readAddr, maxBytes)}\n`) }
+})
+new Channel({
+  read(writeAddr, maxBytes) { return 0 },
+  write(readAddr, maxBytes) { console.error(wasmString(readAddr, maxBytes)) }
+})
+
+/* System runtime */
+const simstack = []
+const rstack = []
+const dictionary = { EXECUTE: 12 }
+const doesDictionary = {}
+const wasmImport = {
+  env: {
+    pop: () => simstack.pop(),
+    push: (val) => simstack.push(val),
+    rinit: () => rstack.length = 0,
+    rpop: () => rstack.length ? rstack.pop() : 16388,
+    rpush: (val) => rstack.push(val),
+    sys_write: (chno, addr, u) => channels[chno] === undefined ? 0 : channels[chno].write(addr, u),
+    sys_read: (chno, addr, u) => channels[chno] === undefined ? 0 : channels[chno].read(addr, u),
+    sys_listen: (chno, cbAddr, addr, u) => { //sys_connect?
+      //TODO: call into the module to wasm fn "event" to push an event
+      //to forth, which pushes esi to the return stack and queues the
+      //callback function provided from listen. reqaddr could be
+      //"fetch", in which case no channel is used.  otherwise very
+      //similar to sys_fetch.
+
+      //callbacks are events, like listen events
+      //totally event-driven, one listener per event
+      //other listen types: mouse, keyboard, touch, main_loop (10ms interval), wrtc, etc
+      //fetch is different because it offers no "write" interface, doesn't repeat
+    },
+    sys_fetch: (cbAddr, addr, u) => {
+      const str = wasmString(addr, u)
+      console.log(`fetching: ${str}`)
+      const args = JSON.parse(wasmString(addr, u))
+      console.log(args)
+      const url = args.url
+      delete args.url
+      const channel = new Channel()
+      fetch(url, args).then((re) => {
+        if (args.headers === undefined ||
+            args.headers['content-type'] === undefined ||
+            args.headers['content-type'].toLowerCase().indexOf('text/plain') === 0 )
+          re.text().then((txt) => forth(channel.chno, txt))
+        else {
+          const reader = new FileReader()
+          reader.onload = (evt) => forth(channel.chno, evt.target.result)
+          re.blob().then((blob) => reader.readAsArrayBuffer(blob))
+        }
+      }).catch(console.error)
+      //TODO: map to fetch promise, write to channel buffer,
+      //javascript "fetch" as fallback, explicit handles for
+      //"textEntry" or any third party protocols like activitypub
+      return channel.chno
+    },
+    sys_close: (chno) => delete channels[chno],
+    sys_echo: (val, base) => output.print(`\\\ => ${val.toString(base)} `),
+    sys_echochar: (val) => output.print(String.fromCharCode(val)),
+    sys_reflect: (addr) => {
+      console.log(`reflect: ${addr}: ${
+        new DataView(wasmMem, addr, 4)
+              .getUint32(0,true)
+      }`)
+    },
+    vocab_get: (addr, u) => dictionary[wasmString(addr, u).toUpperCase()] || 0, 
+    vocab_set: (addr, u, v) => dictionary[wasmString(addr, u).toUpperCase()] = v,
+    does_get: (addr, u) => doesDictionary[wasmString(addr, u).toUpperCase()] || 0,
+    does_set: (addr, u, v) => doesDictionary[wasmString(addr, u).toUpperCase()] = v,
+    is_whitespace: (key) => /\s/.test(String.fromCharCode(key)),
+    sys_stack: () => console.log(`[${simstack}][${rstack}]`),
+    sys_parsenum: (addr, u, base) => {
+      const answer = Number.parseInt(wasmString(addr, u), base)
+      if (Number.isNaN(answer))
+        return -1
+      new DataView(wasmMem, addr, 4).setUint32(0,answer,true)
+      return 0
+    },
+    sys_words: () => {
+      output.print(Object.getOwnPropertyNames(dictionary).toString().split(',').join('  '))
+    }
+  }
+}
+
+/* View Logic */
 window.onload = () => {
-  /* Initialize Views */
   let forthdiv = document.getElementById("forth")
   if (forthdiv === null) {
     forthdiv = document.createElement("div")
@@ -26,7 +216,7 @@ window.onload = () => {
   const outframe = document.createElement("div")
   outframe.setAttribute("style", "background-color:black;padding-left:6px;padding-right:6px;color:chartreuse;height:268px;resize:vertical;display:flex;align-items:flex-end;flex-flow:row;")
   const stackview = document.createElement("pre")
-  stackview.setAttribute("style", "white-space:pre-wrap;flex:0 0 8%;")
+  stackview.setAttribute("style", "white-space:pre-wrap;flex:0 0 6%;")
   outframe.appendChild(stackview)
   const txtoutput = document.createElement("pre")
   txtoutput.setAttribute("style", "white-space:pre-wrap;max-height:256px;overflow-y:scroll;flex:1 0 342px;")
@@ -40,53 +230,10 @@ window.onload = () => {
   const txtinput = document.createElement("textarea")
   txtinput.setAttribute("autofocus", "true")
   txtinput.setAttribute("wrap", "hard")
-  txtinput.setAttribute("style", "resize:none;white-space:pre;margin-left:8%;width:75%;")
+  txtinput.setAttribute("style", "resize:none;white-space:pre;margin-left:6%;width:77%;")
   txtinput.oninput = () => txtinput.setAttribute("rows", ((txtinput.value.match(/[\n]/g) || [1]).length + 1).toString());
   txtinput.oninput()
-  forthdiv.appendChild(outframe)
-  forthdiv.appendChild(txtinput)
-
-  /* Initialize State */
-  const simstack = []
-  const rstack = []
-  let wasmMem
-  let forth
-  const dictionary = { EXECUTE: 12 }
-  const doesDictionary = {}
-
-  /* Environment functions */
-  const output = {
-    print: (string) => txtoutput.textContent += `\\\ => ${string} \n`
-  }
-  const wasmString = (addr, u) =>
-        String.fromCharCode.apply(
-          null,
-          new Uint16Array(wasmMem.buffer, addr, u >> 1)
-        )
-  const updateViews = () => {
-    const base = new DataView(wasmMem.buffer, 14348 /* base */, 4).getUint32(0,true)
-    stackview.textContent = simstack.map((v) => v.toString(base)).join('\n')
-    // rstackview.textContent = rstack.join('\n')
-    let cnt = 0;
-    const maxBytes = 64
-    let here = new DataView(wasmMem.buffer, 14340 /* here */, 4).getUint32(0,true)
-    memview.textContent = Array.from(new Uint8Array(wasmMem.buffer, here - maxBytes, maxBytes), (v) => {
-      cnt++;
-      v = ('0' + (v & 0xFF).toString(16)).slice(-2)
-      if (cnt === maxBytes)
-        return v
-      if ((cnt % 16) === 0)
-        return `${v}\n=> ${(here -maxBytes + cnt).toString(base)}\n`
-      if ((cnt % 4) === 0)
-        return `${v}\n`
-      return `${v} `
-    }).join('')
-    outframe.scrollTop = outframe.scrollHeight
-  }
-
-  /* Input capture */
-  let stdin = ""
-  txtinput.addEventListener('keydown', (event) => {
+  txtinput.onkeydown = (event) => {
     switch (event.key) {
     case "Enter":
       if (event.ctrlKey) {
@@ -99,16 +246,12 @@ window.onload = () => {
         txtinput.oninput()
       }
       else {
-        stdin += txtinput.value
-        txtoutput.textContent += txtinput.value
         if (!/\s/.test(txtinput.value.slice(-1)))
-          txtoutput.textContent += " "
-        txtinput.value = ""
+          txtinput.value += " "
         event.preventDefault()
         event.stopPropagation()
-        forth()
-        updateViews()
-        txtoutput.scrollTop = txtoutput.scrollHeight
+        forth(txtinput.value)
+        txtinput.value = ""
       }
       break
     case "Backspace":
@@ -116,81 +259,30 @@ window.onload = () => {
     default:
       break
     }
-  })
-  const channels = [{
-    read: (writeAddr, maxBytes) => {
-      const maxChars = maxBytes >> 1
-      const bufView = new Uint16Array(wasmMem.buffer, writeAddr, maxChars)
-      let i
-      for (i = 0; i < maxChars && i < stdin.length; i++)
-        bufView[i] = stdin.charCodeAt(i)
-      stdin = stdin.substring(maxChars)
-      return i << 1
-    },
-    write: (readAddr, maxBytes) =>
-      output.print(String.fromCharCode.apply(
-        null,
-        new Uint16Array(wasmMem.buffer, readAddr, maxBytes >> 1)
-      ))
-  }]
-
-  /* System runtime */
-  const wasmImport = {
-    env: {
-      pop: () => simstack.pop(),
-      push: (val) => simstack.push(val),
-      rinit: () => rstack.length = 0,
-      rpop: () => rstack.pop(),
-      rpush: (val) => rstack.push(val),
-      sys_write: (channel, addr, u) => channels[channel] === undefined ? 0 : channels[channel].write(addr, u),
-      sys_read: (channel, addr, u) => channels[channel] === undefined ? 0 : channels[channel].read(addr, u),
-      sys_listen: (reqAddr, cbAddr) => {
-        //TODO: call into the module to wasm fn "event" to push an event
-        //to forth, which pushes esi to the return stack and queues the
-        //callback function provided from listen. reqaddr could be
-        //"fetch", in which case no channel is used.  otherwise very
-        //similar to sys_fetch.
-      },
-      sys_fetch: (channel, reqAddr) => {
-        //TODO: map to fetch promise, write to channel buffer,
-        //javascript "fetch" as fallback, explicit handles for
-        //"textEntry" or any third party protocols like activitypub
-        console.log(`fetch ${channel} ${reqAddr}`)
-      },
-      sys_echo: (val, base) => output.print(`${val.toString(base)} `),
-      sys_echochar: (val) => output.print(String.fromCharCode(val)),
-      sys_reflect: (addr) => {
-        console.log(`reflect: ${addr}: ${
-        new DataView(wasmMem.buffer, addr, 4)
-              .getUint32(0,true)
-      }`)
-      },
-      vocab_get: (addr, u) => dictionary[wasmString(addr, u).toUpperCase()] || 0, 
-      vocab_set: (addr, u, v) => dictionary[wasmString(addr, u).toUpperCase()] = v,
-      does_get: (addr, u) => doesDictionary[wasmString(addr, u).toUpperCase()] || 0,
-      does_set: (addr, u, v) => doesDictionary[wasmString(addr, u).toUpperCase()] = v,
-      is_whitespace: (key) => /\s/.test(String.fromCharCode(key)),
-      sys_stack: () => console.log(`[${simstack}][${rstack}]`),
-      sys_parsenum: (addr, u, base) => {
-        const answer = Number.parseInt(wasmString(addr, u), base)
-        if (Number.isNaN(answer))
-          return -1
-        new DataView(wasmMem.buffer, addr, 4).setUint32(0,answer,true)
-        return 0
-      },
-      sys_words: () => {
-        output.print(Object.getOwnPropertyNames(dictionary).toString().split(',').join('  '))
-      }
-    }
   }
-  initialize.then((results) => {
-    stdin = results[0]
-    WebAssembly.instantiate(results[1], wasmImport).then((module) => {
-      wasmMem = module.instance.exports.memory
-      forth = module.instance.exports.main
-      console.log('wasm loaded')
-      forth()
-      updateViews()
-    })
-  })
+  forthdiv.appendChild(outframe)
+  forthdiv.appendChild(txtinput)
+  /* Set up output functions */
+  output.print = (string) => txtoutput.textContent += string,
+  output.updateViews = () => {
+    const base = new DataView(wasmMem, 14348 /* base */, 4).getUint32(0,true)
+    stackview.textContent = simstack.map((v) => v.toString(base)).join('\n')
+    // rstackview.textContent = rstack.join('\n')
+    let cnt = 0;
+    const maxBytes = 64
+    let here = new DataView(wasmMem, 14340 /* here */, 4).getUint32(0,true)
+    memview.textContent = Array.from(new Uint8Array(wasmMem, here - maxBytes, maxBytes), (v) => {
+      cnt++;
+      v = ('0' + (v & 0xFF).toString(16)).slice(-2)
+      if (cnt === maxBytes)
+        return v
+      if ((cnt % 16) === 0)
+        return `${v}\n=> ${(here -maxBytes + cnt).toString(base)}\n`
+      if ((cnt % 4) === 0)
+        return `${v}\n`
+      return `${v} `
+    }).join('')
+    outframe.scrollTop = outframe.scrollHeight
+    txtoutput.scrollTop = txtoutput.scrollHeight
+  }
 }