Language auto detection

heynote-codemirror/package.json

@@ -12,7 +12,7 @@
     },
     "keywords": [],
     "author": "",
-    "license": "ISC",
+    "license": "",
     "dependencies": {
         "@codemirror/commands": "^6.1.2",
         "@codemirror/lang-html": "^6.4.0",
@@ -29,8 +29,7 @@
         "@lezer/generator": "^1.1.3",
         "@rollup/plugin-node-resolve": "^15.0.1",
         "codemirror": "^6.0.1",
-        "i": "^0.3.7",
-        "npm": "^9.2.0",
+        "highlight.js": "^11.7.0",
         "rollup": "^3.8.1",
         "rollup-plugin-typescript2": "^0.34.1",
         "typescript": "^4.9.4"

heynote-codemirror/src/annotation.js

@@ -1,5 +1,5 @@
 import { Annotation } from "@codemirror/state"
 
 export const heynoteEvent = Annotation.define()
-export const INITIAL_DATA = "initial-data"
+export const LANGUAGE_CHANGE = "heynote-change"
 

heynote-codemirror/src/block/commands.js

@@ -3,14 +3,17 @@ import {
     selectAll as defaultSelectAll, 
     moveLineUp as defaultMoveLineUp,
 } from "@codemirror/commands"
-import { blockState } from "./note-block"
+import { heynoteEvent, LANGUAGE_CHANGE } from "../annotation.js";
+import { HIGHLIGHTJS_TO_TOKEN } from "../languages"
+import { blockState, getActiveNoteBlock } from "./note-block"
+import { levenshtein_distance } from "../language-detection/levenshtein"
 
 
 export const insertNewNote = ({ state, dispatch }) => {
     if (state.readOnly)
         return false
 
-    const delimText = "\n∞∞∞text\n"
+    const delimText = "\n∞∞∞text-a\n"
     dispatch(state.replaceSelection(delimText), 
         {
             scrollIntoView: true, 
@@ -22,9 +25,8 @@ export const insertNewNote = ({ state, dispatch }) => {
 }
 
 export const selectAll = ({ state, dispatch }) => {
-    // find which block the cursor is in
     const range = state.selection.asSingle().ranges[0]
-    const block = state.facet(blockState).find(block => block.content.from <= range.from && block.content.to >= range.from)
+    const block = getActiveNoteBlock(state)
 
     // check if all the text of the note is already selected, in which case we want to select all the text of the whole document
     if (range.from === block.content.from && range.to === block.content.to) {
@@ -51,3 +53,39 @@ export function moveLineUp({ state, dispatch }) {
     }
     return defaultMoveLineUp({state, dispatch})
 }
+
+
+export function changeLanguageTo(state, dispatch, block, language, auto) {
+    const delimRegex = /^\n∞∞∞[a-z]{0,16}(-a)?\n/g
+    if (state.doc.sliceString(block.delimiter.from, block.delimiter.to).match(delimRegex)) {
+        //console.log("changing language to", language)
+        dispatch(state.update({
+            changes: {
+                from: block.delimiter.from,
+                to: block.delimiter.to,
+                insert: `\n∞∞∞${language}${auto ? '-a' : ''}\n`,
+            },
+            annotations: [heynoteEvent.of(LANGUAGE_CHANGE)],
+        }))
+    } else {
+        throw new Error("Invalid delimiter: " + state.doc.sliceString(block.delimiter.from, block.delimiter.to))
+    }
+}
+
+
+export function autoDetectLanguage({ state, dispatch }) {
+    console.log("state:", state)
+    const block = getActiveNoteBlock(state)
+
+    //console.log("content:", state.doc.sliceString(block.content.from, block.content.to))
+    //console.log("langs:", hljs.listLanguages())
+
+    let startTime = new Date();
+    const result = hljs.highlightAuto(state.doc.sliceString(block.content.from, block.content.to), ["json", "python", "javascript", "html", "sql", "java", "plaintext"])
+    console.log("took:", new Date() - startTime)
+    console.log("highlight.js result", result)
+    if (result.language) {
+        changeLanguageTo(state, dispatch, block, HIGHLIGHTJS_TO_TOKEN[result.language], true)
+    }
+}
+

heynote-codemirror/src/block/note-block.js

@@ -5,7 +5,7 @@ import { RangeSet } from "@codemirror/rangeset";
 import { syntaxTree } from "@codemirror/language"
 import { Note, Document, NoteDelimiter } from "../lang-heynote/parser.terms.js"
 import { IterMode } from "@lezer/common";
-import { INITIAL_DATA } from "../annotation.js";
+import { heynoteEvent, LANGUAGE_CHANGE } from "../annotation.js";
 
 
 // tracks the size of the first delimiter
@@ -18,8 +18,15 @@ function getBlocks(state) {
             if (type.type.id == Document || type.type.id == Note) {
                 return true
             } else if (type.type.id === NoteDelimiter) {
+                const langNode = type.node.getChild("NoteLanguage")
+                const language = state.doc.sliceString(langNode.from, langNode.to)
+                const isAuto = !!type.node.getChild("Auto")
                 const contentNode = type.node.nextSibling
                 blocks.push({
+                    language: {
+                        name: language,
+                        auto: isAuto,
+                    },
                     content: {
                         from: contentNode.from,
                         to: contentNode.to,
@@ -198,7 +205,8 @@ const blockLayer = layer({
 
 
 const preventFirstBlockFromBeingDeleted = EditorState.changeFilter.of((tr) => {
-    if (!tr.annotations.some(a => a.value === INITIAL_DATA) && firstBlockDelimiterSize) {
+    //console.log("annotations:", tr.annotation(heynoteEvent), tr.annotations.some(a => tr.annotation(heynoteEvent))) 
+    if (!tr.annotations.some(a => a.type === heynoteEvent) && firstBlockDelimiterSize) {
         return [0, firstBlockDelimiterSize]
     }
 })

heynote-codemirror/src/editor.js

@@ -9,6 +9,7 @@ import { customSetup } from "./setup.js"
 import { heynoteLang } from "./lang-heynote/heynote.js"
 import { noteBlockExtension } from "./block/note-block.js"
 import { heynoteKeymap } from "./keymap.js"
+import { languageDetection } from "./language-detection/autodetect.js"
 
 
 export class HeynoteEditor {
@@ -30,6 +31,7 @@ export class HeynoteEditor {
                 }),
                 heynoteLang(),
                 noteBlockExtension(),
+                languageDetection(() => this.view),
                 
                 // set cursor blink rate to 1 second
                 drawSelection({cursorBlinkRate:1000}),
@@ -70,23 +72,3 @@ editor.update([
     })
 ])*/
 
-
-/*
-// render syntax tree
-setTimeout(() => {
-    function render(tree) {
-        let lists = ''
-        tree.iterate({
-            enter(type) {
-                lists += `<ul><li>${type.name} (${type.from},${type.to})`
-            },
-            leave() {
-                lists += '</ul>'
-            }
-        })
-        return lists
-    }
-    let html = render(syntaxTree(editor.state))
-    document.getElementById("syntaxTree").innerHTML = html;
-}, 1000)
-*/

heynote-codemirror/src/fixture.js

@@ -5,7 +5,7 @@ hej∞∞∞python
 f = lambda: 2 +1`;*/
 
 export default `
-∞∞∞python
+∞∞∞text-a
 # hmm
 def my_func():
   print("hejsan")
@@ -16,7 +16,7 @@ import {EditorView, keymap} from "@codemirror/view"
 import {javascript} from "@codemirror/lang-javascript"
 import {indentWithTab, insertTab, indentLess, indentMore} from "@codemirror/commands"
 import {nord} from "./nord.mjs"
-∞∞∞javascript
+∞∞∞javascript-a
 let editor = new EditorView({
   //extensions: [basicSetup, javascript()],
   extensions: [

heynote-codemirror/src/index.html

@@ -10,6 +10,6 @@
 <body>
     <div id="editor"></div>
     <!--<div id="syntaxTree"></div>-->
-    <script src="bundle.js"></script>  
+    <script src="bundle.js"></script>
 </body>
 </html>

heynote-codemirror/src/index.js

@@ -1,3 +1,5 @@
+import { syntaxTree } from "@codemirror/language"
+
 import { HeynoteEditor } from "./editor.js"
 import initialData from "./fixture.js"
 
@@ -5,3 +7,23 @@ let editor = new HeynoteEditor({
     element: document.getElementById("editor"),
     content: initialData,
 })
+
+/*// render syntax tree
+setTimeout(() => {
+    function render(tree) {
+        let lists = ''
+        tree.iterate({
+            enter(type) {
+                lists += `<ul><li>${type.name} (${type.from},${type.to})`
+            },
+            leave() {
+                lists += '</ul>'
+            }
+        })
+        return lists
+    }
+    let html = render(syntaxTree(editor.state))
+    document.getElementById("syntaxTree").innerHTML = html;
+}, 1000)
+*/
+

heynote-codemirror/src/keymap.js

@@ -1,6 +1,6 @@
 import { keymap } from "@codemirror/view"
 import { indentWithTab, insertTab, indentLess, indentMore } from "@codemirror/commands"
-import { insertNewNote, moveLineUp, selectAll } from "./block/commands.js";
+import { insertNewNote, moveLineUp, selectAll, autoDetectLanguage } from "./block/commands.js";
 
 export const heynoteKeymap = keymap.of([
     {
@@ -28,5 +28,10 @@ export const heynoteKeymap = keymap.of([
         key: "Alt-ArrowUp",
         preventDefault: true,
         run: moveLineUp,
-    }
+    },
+    {
+        key: "Mod-Shift-a",
+        preventDefault: true,
+        run: autoDetectLanguage,
+    },
 ])

heynote-codemirror/src/lang-heynote/external-tokens.js

@@ -13,10 +13,10 @@ export const noteContent = new ExternalTokenizer((input) => {
 
     while (true) {
         let potentialLang = "";
-        for (let i=0; i<16; i++) {
+        for (let i=0; i<18; i++) {
             potentialLang += String.fromCharCode(input.peek(i));
         }
-        if (potentialLang.match(/^\n∞∞∞(text|javascript|json|python|html|sql|markdown|java|lezer|php)\n/g)) {
+        if (potentialLang.match(/^\n∞∞∞(text|javascript|json|python|html|sql|markdown|java|lezer|php)(-a)?\n/g)) {
             input.acceptToken(NoteContent);
             return;
         }

heynote-codemirror/src/lang-heynote/heynote.grammar

@@ -5,13 +5,14 @@ Note {
 }
 
 NoteDelimiter {
-    noteDelimiterEnter noteDelimiterMark NoteLanguage noteDelimiterEnter
+    noteDelimiterEnter noteDelimiterMark NoteLanguage Auto? noteDelimiterEnter
 }
 
 
 @tokens {
     noteDelimiterMark { "∞∞∞" }
     NoteLanguage { "text" | "javascript" | "json" | "python" | "html" | "sql" | "markdown" | "java" | "lezer" | "php" }
+    Auto { "-a" }
     noteDelimiterEnter { "\n" }
     //NoteContent { String }
     //String { (![∞])+ }

heynote-codemirror/src/lang-heynote/parser.js

@@ -3,14 +3,14 @@ import {LRParser} from "@lezer/lr"
 import {noteContent} from "./external-tokens.js"
 export const parser = LRParser.deserialize({
   version: 14,
-  states: "!^QQOPOOOVOPO'#C`O[OQO'#C_OOOO'#Cb'#CbQQOPOOOaOPO,58zOOOO,58y,58yOOOO-E6`-E6`OfOPO1G.fOOOQ7+$Q7+$Q",
-  stateData: "k~OWPO~OXTO~OPUO~OTWO~OWXO~O",
-  goto: "fVPPPW[P`TROSTQOSQSORVS",
-  nodeNames: "⚠ NoteContent Document Note NoteDelimiter NoteLanguage",
-  maxTerm: 9,
+  states: "!jQQOPOOOVOPO'#C`O[OQO'#C_OOOO'#Cc'#CcQQOPOOOaOPO,58zOOOO,58y,58yOOOO-E6a-E6aOfOPO1G.fOOOQ7+$Q7+$QOnOPO7+$QOOOQ<<Gl<<Gl",
+  stateData: "s~OXPO~OYTO~OPUO~OTWO~OUYOXXO~OXZO~O",
+  goto: "gWPPPX]PPaTROSTQOSQSORVS",
+  nodeNames: "⚠ NoteContent Document Note NoteDelimiter NoteLanguage Auto",
+  maxTerm: 10,
   skippedNodes: [0],
   repeatNodeCount: 1,
-  tokenData: "&e~RXYZn#[#]s#^#_![#`#a#u#a#b$_#d#e%T#g#h%p#h#i%v%&x%&y&S~sOW~~vP#h#iy~|P#a#b!P~!SP#`#a!V~![OT~~!_Q#T#U!e#g#h#i~!hP#j#k!k~!nP#T#U!q~!vPT~#g#h!y~!|P#V#W#P~#SP#f#g#V~#YP#]#^#]~#`P#d#e#c~#fP#h#i!V~#lP#c#d#o~#rP#b#c!V~#xP#X#Y#{~$OP#n#o$R~$UP#X#Y$X~$[P#f#g!V~$bP#T#U$e~$hP#f#g$k~$nP#_#`$q~$tP#W#X$w~$zP#c#d$}~%QP#k#l#o~%WQ#[#]%^#m#n%d~%aP#d#e!V~%gP#h#i%j~%mP#[#]#i~%sP#e#f!P~%yP#X#Y%|~&PP#l#m#c~&VP%&x%&y&Y~&]P%&x%&y&`~&eOX~",
+  tokenData: "&s~RYYZq}!Ov#[#]!R#^#_!j#`#a$T#a#b$m#d#e%c#g#h&O#h#i&U%&x%&y&b~vOX~~yP#T#U|~!ROU~~!UP#h#i!X~![P#a#b!_~!bP#`#a!e~!jOT~~!mQ#T#U!s#g#h#w~!vP#j#k!y~!|P#T#U#P~#UPT~#g#h#X~#[P#V#W#_~#bP#f#g#e~#hP#]#^#k~#nP#d#e#q~#tP#h#i!e~#zP#c#d#}~$QP#b#c!e~$WP#X#Y$Z~$^P#n#o$a~$dP#X#Y$g~$jP#f#g!e~$pP#T#U$s~$vP#f#g$y~$|P#_#`%P~%SP#W#X%V~%YP#c#d%]~%`P#k#l#}~%fQ#[#]%l#m#n%r~%oP#d#e!e~%uP#h#i%x~%{P#[#]#w~&RP#e#f!_~&XP#X#Y&[~&_P#l#m#q~&eP%&x%&y&h~&kP%&x%&y&n~&sOY~",
   tokenizers: [0, noteContent],
   topRules: {"Document":[0,2]},
   tokenPrec: 0

heynote-codemirror/src/lang-heynote/parser.terms.js

@@ -4,4 +4,5 @@ export const
   Document = 2,
   Note = 3,
   NoteDelimiter = 4,
-  NoteLanguage = 5
+  NoteLanguage = 5,
+  Auto = 6

heynote-codemirror/src/language-detection/autodetect.js

@@ -0,0 +1,92 @@
+import { EditorState } from "@codemirror/state";
+import { EditorView } from "codemirror";
+import { getActiveNoteBlock, blockState } from "../block/note-block";
+import { levenshtein_distance } from "./levenshtein";
+import { HIGHLIGHTJS_TO_TOKEN } from "../languages";
+import { changeLanguageTo } from "../block/commands";
+import { LANGUAGE_CHANGE } from "../annotation";
+
+
+export function languageDetection(getView) {
+    const previousBlockContent = []
+    let idleCallbackId = null
+
+    const detectionWorker = new Worker('language-detection/worker.js');
+    detectionWorker.onmessage = (event) => {
+        //console.log("event:", event.data)
+        if (!event.data.highlightjs.language) {
+            return
+        }
+        const view = getView()
+        const state = view.state
+        const block = getActiveNoteBlock(state)
+        const newLang = HIGHLIGHTJS_TO_TOKEN[event.data.highlightjs.language]
+        if (block.language.auto === true && block.language.name !== newLang) {
+            let content = state.doc.sliceString(block.content.from, block.content.to)
+            const threshold = content.length * 0.1
+            if (levenshtein_distance(content, event.data.content) <= threshold) {
+                console.log("Setting new auto detected language:", newLang)
+                // the content has not changed significantly
+                changeLanguageTo(state, view.dispatch, block, newLang, true)
+            } else {
+                console.log("Content has changed significantly, not setting new language")
+            }
+        }
+    }
+
+    const plugin = EditorView.updateListener.of(update => {
+        if (update.docChanged) {
+            if (idleCallbackId !== null) {
+                cancelIdleCallback(idleCallbackId)
+                idleCallbackId = null
+            }
+            if (update.transactions.every(tr => tr.annotations.some(a => a.value == LANGUAGE_CHANGE))) {
+                // don't run language detection if the change was triggered by a language change
+                //console.log("ignoring check after language change")
+                return
+            }
+
+            idleCallbackId = requestIdleCallback(() => {
+                idleCallbackId = null
+                
+                const range = update.state.selection.asSingle().ranges[0]
+                const blocks = update.state.facet(blockState)
+                let block = null, idx = null;
+                for (let i=0; i<blocks.length; i++) {
+                    if (blocks[i].content.from <= range.from && blocks[i].content.to >= range.from) {
+                        block = blocks[i]
+                        idx = i
+                        break
+                    }
+                }
+                if (block === null || block.language.auto === false) {
+                    return
+                }
+
+                const content = update.state.doc.sliceString(block.content.from, block.content.to)
+                if (content === "") {
+                    // if content is cleared, set language to plaintext
+                    const view = getView()
+                    const block = getActiveNoteBlock(view.state)
+                    changeLanguageTo(view.state, view.dispatch, block, "text", true)
+                }
+                if (content.length <= 8) {
+                    return
+                }
+                const threshold = content.length * 0.1
+                if (!previousBlockContent[idx] || levenshtein_distance(previousBlockContent[idx], content) >= threshold) {
+                    // the content has changed significantly, so schedule a language detection
+                    //console.log("Scheduling language detection for block", idx, "with threshold", threshold)
+                    detectionWorker.postMessage({
+                        content: content,
+                        idx: idx,
+                    })
+                    previousBlockContent[idx] = content
+                }
+            })
+        }
+    })
+
+    return plugin
+}
+

heynote-codemirror/src/language-detection/levenshtein.js

@@ -0,0 +1,99 @@
+function _min(d0, d1, d2, bx, ay) {
+    return d0 < d1 || d2 < d1
+        ? d0 > d2
+            ? d2 + 1
+            : d0 + 1
+        : bx === ay
+            ? d1
+            : d1 + 1;
+}
+
+export function levenshtein_distance (a, b) {
+    if (a === b) {
+        return 0;
+    }
+
+    if (a.length > b.length) {
+        var tmp = a;
+        a = b;
+        b = tmp;
+    }
+
+    var la = a.length;
+    var lb = b.length;
+
+    while (la > 0 && (a.charCodeAt(la - 1) === b.charCodeAt(lb - 1))) {
+        la--;
+        lb--;
+    }
+
+    var offset = 0;
+
+    while (offset < la && (a.charCodeAt(offset) === b.charCodeAt(offset))) {
+        offset++;
+    }
+
+    la -= offset;
+    lb -= offset;
+
+    if (la === 0 || lb < 3) {
+        return lb;
+    }
+
+    var x = 0;
+    var y;
+    var d0;
+    var d1;
+    var d2;
+    var d3;
+    var dd;
+    var dy;
+    var ay;
+    var bx0;
+    var bx1;
+    var bx2;
+    var bx3;
+
+    var vector = [];
+
+    for (y = 0; y < la; y++) {
+        vector.push(y + 1);
+        vector.push(a.charCodeAt(offset + y));
+    }
+
+    var len = vector.length - 1;
+
+    for (; x < lb - 3;) {
+        bx0 = b.charCodeAt(offset + (d0 = x));
+        bx1 = b.charCodeAt(offset + (d1 = x + 1));
+        bx2 = b.charCodeAt(offset + (d2 = x + 2));
+        bx3 = b.charCodeAt(offset + (d3 = x + 3));
+        dd = (x += 4);
+        for (y = 0; y < len; y += 2) {
+            dy = vector[y];
+            ay = vector[y + 1];
+            d0 = _min(dy, d0, d1, bx0, ay);
+            d1 = _min(d0, d1, d2, bx1, ay);
+            d2 = _min(d1, d2, d3, bx2, ay);
+            dd = _min(d2, d3, dd, bx3, ay);
+            vector[y] = dd;
+            d3 = d2;
+            d2 = d1;
+            d1 = d0;
+            d0 = dy;
+        }
+    }
+
+    for (; x < lb;) {
+        bx0 = b.charCodeAt(offset + (d0 = x));
+        dd = ++x;
+        for (y = 0; y < len; y += 2) {
+            dy = vector[y];
+            vector[y] = dd = _min(dy, d0, dd, bx0, vector[y + 1]);
+            d0 = dy;
+        }
+    }
+
+    return dd;
+};
+

heynote-codemirror/src/language-detection/worker.js

@@ -0,0 +1,16 @@
+const HIGHLIGHTJS_LANGUAGES = ["json", "python", "javascript", "html", "sql", "java", "plaintext"]
+
+onmessage = (event) => {
+    //console.log("worker received message:", event.data)
+    importScripts("../../lib/highlight.min.js")
+    const result = self.hljs.highlightAuto(event.data.content, HIGHLIGHTJS_LANGUAGES);
+    postMessage({
+        highlightjs: {
+            language: result.language,
+            relevance: result.relevance,
+            illegal: result.illegal,
+        },
+        content: event.data.content,
+        idx: event.data.idx,
+    })
+}

heynote-codemirror/src/languages.js

@@ -0,0 +1,17 @@
+export const LANGUAGE_TOKENS = [
+    "text",
+    "javascript",
+    "json",
+    "python",
+    "html",
+    "sql",
+    "markdown",
+    "java",
+    "lezer",
+    "php",
+]
+
+export const HIGHLIGHTJS_TO_TOKEN = Object.fromEntries(LANGUAGE_TOKENS.map(l => [l,l]))
+HIGHLIGHTJS_TO_TOKEN["plaintext"] = "text"
+
+