| 1 | import { WASM_BASE64 } from "./wasm-inline.js"; |
| 2 | function decodeBase64(base64) { |
| 3 | const binary = atob(base64); |
| 4 | const bytes = new Uint8Array(binary.length); |
| 5 | for (let i = 0; i < binary.length; i++) |
| 6 | bytes[i] = binary.charCodeAt(i); |
| 7 | return bytes.buffer; |
| 8 | } |
| 9 | export class WasmBridge { |
| 10 | get dv() { |
| 11 | if (this._dvBuffer !== this.memory.buffer) { |
| 12 | this._dvBuffer = this.memory.buffer; |
| 13 | this._dv = new DataView(this.memory.buffer); |
| 14 | } |
| 15 | return this._dv; |
| 16 | } |
| 17 | constructor(instance) { |
| 18 | this.gridPtr = 0; |
| 19 | this.dirtyPtr = 0; |
| 20 | this.writeBufferPtr = 0; |
| 21 | this.cellSize = 12; |
| 22 | this.maxCols = 256; |
| 23 | this.encoder = new TextEncoder(); |
| 24 | this.decoder = new TextDecoder(); |
| 25 | this._dvBuffer = null; |
| 26 | this.linkCache = new Map(); |
| 27 | this.exports = instance.exports; |
| 28 | this.memory = this.exports.memory; |
| 29 | } |
| 30 | static async load(url) { |
| 31 | let bytes; |
| 32 | if (url) { |
| 33 | const response = await fetch(url); |
| 34 | if (!response.ok) { |
| 35 | throw new Error(`[wterm] Failed to load WASM from ${url}: ${response.status} ${response.statusText}`); |
| 36 | } |
| 37 | bytes = await response.arrayBuffer(); |
| 38 | } |
| 39 | else { |
| 40 | bytes = decodeBase64(WASM_BASE64); |
| 41 | } |
| 42 | const { instance } = await WebAssembly.instantiate(bytes); |
| 43 | return new WasmBridge(instance); |
| 44 | } |
| 45 | init(cols, rows) { |
| 46 | this.exports.init(cols, rows); |
| 47 | this.linkCache.clear(); |
| 48 | this._updatePointers(); |
| 49 | } |
| 50 | _updatePointers() { |
| 51 | this.gridPtr = this.exports.getGridPtr(); |
| 52 | this.dirtyPtr = this.exports.getDirtyPtr(); |
| 53 | this.writeBufferPtr = this.exports.getWriteBuffer(); |
| 54 | this.cellSize = this.exports.getCellSize(); |
| 55 | this.maxCols = this.exports.getMaxCols(); |
| 56 | } |
| 57 | writeString(str, afterChunk) { |
| 58 | const encoded = this.encoder.encode(str); |
| 59 | this.writeRaw(encoded, afterChunk); |
| 60 | } |
| 61 | writeRaw(data, afterChunk) { |
| 62 | let offset = 0; |
| 63 | while (offset < data.length) { |
| 64 | const chunk = Math.min(data.length - offset, 8192); |
| 65 | const buf = new Uint8Array(this.memory.buffer, this.writeBufferPtr, 8192); |
| 66 | buf.set(data.subarray(offset, offset + chunk)); |
| 67 | this.exports.writeBytes(chunk); |
| 68 | offset += chunk; |
| 69 | afterChunk?.(); |
| 70 | } |
| 71 | } |
| 72 | getCell(row, col) { |
| 73 | const offset = this.gridPtr + (row * this.maxCols + col) * this.cellSize; |
| 74 | const dv = this.dv; |
| 75 | const result = { |
| 76 | char: dv.getUint32(offset, true), |
| 77 | fg: dv.getUint16(offset + 4, true), |
| 78 | bg: dv.getUint16(offset + 6, true), |
| 79 | flags: dv.getUint8(offset + 8), |
| 80 | width: dv.getUint8(offset + 9), |
| 81 | }; |
| 82 | Object.assign(result, this._readLink(dv.getUint16(offset + 10, true))); |
| 83 | return result; |
| 84 | } |
| 85 | isDirtyRow(row) { |
| 86 | return new Uint8Array(this.memory.buffer, this.dirtyPtr, 256)[row] !== 0; |
| 87 | } |
| 88 | clearDirty() { |
| 89 | this.exports.clearDirty(); |
| 90 | } |
| 91 | getCursor() { |
| 92 | return { |
| 93 | row: this.exports.getCursorRow(), |
| 94 | col: this.exports.getCursorCol(), |
| 95 | visible: this.exports.getCursorVisible() !== 0, |
| 96 | }; |
| 97 | } |
| 98 | getCols() { |
| 99 | return this.exports.getCols(); |
| 100 | } |
| 101 | getRows() { |
| 102 | return this.exports.getRows(); |
| 103 | } |
| 104 | cursorKeysApp() { |
| 105 | return this.exports.getCursorKeysApp() !== 0; |
| 106 | } |
| 107 | bracketedPaste() { |
| 108 | return this.exports.getBracketedPaste() !== 0; |
| 109 | } |
| 110 | usingAltScreen() { |
| 111 | return this.exports.getUsingAltScreen() !== 0; |
| 112 | } |
| 113 | mouseTracking() { |
| 114 | const mode = this.exports.getMouseTracking(); |
| 115 | return mode === 1000 || mode === 1002 ? mode : 0; |
| 116 | } |
| 117 | mouseSgr() { |
| 118 | return this.exports.getMouseSgr() !== 0; |
| 119 | } |
| 120 | focusEvents() { |
| 121 | return this.exports.getFocusEvents() !== 0; |
| 122 | } |
| 123 | synchronizedOutput() { |
| 124 | return this.exports.getSynchronizedOutput() !== 0; |
| 125 | } |
| 126 | synchronizedOutputGeneration() { |
| 127 | return this.exports.getSynchronizedOutputGeneration(); |
| 128 | } |
| 129 | getTitle() { |
| 130 | if (this.exports.getTitleChanged() === 0) |
| 131 | return null; |
| 132 | const ptr = this.exports.getTitlePtr(); |
| 133 | const len = this.exports.getTitleLen(); |
| 134 | const bytes = new Uint8Array(this.memory.buffer, ptr, len); |
| 135 | return this.decoder.decode(bytes); |
| 136 | } |
| 137 | getResponse() { |
| 138 | const len = this.exports.getResponseLen(); |
| 139 | if (len === 0) |
| 140 | return null; |
| 141 | const ptr = this.exports.getResponsePtr(); |
| 142 | const bytes = new Uint8Array(this.memory.buffer, ptr, len); |
| 143 | const str = this.decoder.decode(bytes); |
| 144 | this.exports.clearResponse(); |
| 145 | return str; |
| 146 | } |
| 147 | getResourceState() { |
| 148 | const capacity = this.exports.getHyperlinkCapacity?.(); |
| 149 | const used = this.exports.getHyperlinkCount?.(); |
| 150 | const rejected = this.exports.getHyperlinkRejectedCount?.(); |
| 151 | if (capacity === undefined || |
| 152 | used === undefined || |
| 153 | rejected === undefined) { |
| 154 | return {}; |
| 155 | } |
| 156 | return { |
| 157 | hyperlinks: { |
| 158 | capacity, |
| 159 | used, |
| 160 | rejected, |
| 161 | saturated: used >= capacity, |
| 162 | }, |
| 163 | }; |
| 164 | } |
| 165 | getScrollbackCount() { |
| 166 | return this.exports.getScrollbackCount(); |
| 167 | } |
| 168 | getScrollbackDiscardedCount() { |
| 169 | return this.exports.getScrollbackDiscardedCount(); |
| 170 | } |
| 171 | getScrollbackCell(offset, col) { |
| 172 | const ptr = this.exports.getScrollbackLine(offset); |
| 173 | const off = ptr + col * this.cellSize; |
| 174 | const dv = this.dv; |
| 175 | const result = { |
| 176 | char: dv.getUint32(off, true), |
| 177 | fg: dv.getUint16(off + 4, true), |
| 178 | bg: dv.getUint16(off + 6, true), |
| 179 | flags: dv.getUint8(off + 8), |
| 180 | width: dv.getUint8(off + 9), |
| 181 | }; |
| 182 | Object.assign(result, this._readLink(dv.getUint16(off + 10, true))); |
| 183 | return result; |
| 184 | } |
| 185 | getScrollbackLineLen(offset) { |
| 186 | return this.exports.getScrollbackLineLen(offset); |
| 187 | } |
| 188 | getUnhandledSequences() { |
| 189 | const count = this.exports.getDebugLogCount(); |
| 190 | if (count === 0) |
| 191 | return []; |
| 192 | const ptr = this.exports.getDebugLogPtr(); |
| 193 | const entrySize = this.exports.getDebugLogEntrySize(); |
| 194 | const maxEntries = this.exports.getDebugLogMax(); |
| 195 | const total = Math.min(count, maxEntries); |
| 196 | const dv = new DataView(this.memory.buffer); |
| 197 | const entries = []; |
| 198 | const startIdx = count >= maxEntries ? count % maxEntries : 0; |
| 199 | for (let i = 0; i < total; i++) { |
| 200 | const idx = (startIdx + i) % maxEntries; |
| 201 | const off = ptr + idx * entrySize; |
| 202 | const finalByte = dv.getUint8(off); |
| 203 | if (finalByte === 0) |
| 204 | continue; |
| 205 | const privateByte = dv.getUint8(off + 1); |
| 206 | const paramCount = dv.getUint8(off + 2); |
| 207 | const params = []; |
| 208 | for (let p = 0; p < Math.min(paramCount, 4); p++) { |
| 209 | params.push(dv.getUint16(off + 4 + p * 2, true)); |
| 210 | } |
| 211 | entries.push({ |
| 212 | final: String.fromCharCode(finalByte), |
| 213 | private: privateByte ? String.fromCharCode(privateByte) : "", |
| 214 | paramCount, |
| 215 | params, |
| 216 | }); |
| 217 | } |
| 218 | return entries; |
| 219 | } |
| 220 | resize(cols, rows) { |
| 221 | this.exports.resizeTerminal(cols, rows); |
| 222 | this._updatePointers(); |
| 223 | } |
| 224 | _readLink(index) { |
| 225 | if (index === 0) |
| 226 | return undefined; |
| 227 | const cached = this.linkCache.get(index); |
| 228 | if (cached) |
| 229 | return cached; |
| 230 | const uriLen = this.exports.getLinkUriLen(index); |
| 231 | if (uriLen === 0) |
| 232 | return undefined; |
| 233 | const uri = this.decoder.decode(new Uint8Array(this.memory.buffer, this.exports.getLinkUriPtr(index), uriLen)); |
| 234 | const idLen = this.exports.getLinkIdLen(index); |
| 235 | const linkId = idLen === 0 |
| 236 | ? undefined |
| 237 | : this.decoder.decode(new Uint8Array(this.memory.buffer, this.exports.getLinkIdPtr(index), idLen)); |
| 238 | const value = { |
| 239 | linkUri: uri, |
| 240 | linkId, |
| 241 | linkKey: linkId ? `e\0${linkId}\0${uri}` : `b\0${index}`, |
| 242 | }; |
| 243 | this.linkCache.set(index, value); |
| 244 | return value; |
| 245 | } |
| 246 | } |