1 files changed, 85 insertions, 0 deletions
diff --git a/share/web_surfaces/shared/message.js b/share/web_surfaces/shared/message.js
new file mode 100644
index 0000000000..836420faac
--- /dev/null
+++ b/share/web_surfaces/shared/message.js
@@ -0,0 +1,85 @@
+/*
+ * Copyright © 2020 Luciano Iam <lucianito@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+export const JSON_INF = 1.0e+128;
+
+export const ANode = Object.freeze({
+	TEMPO: 'tempo',
+	STRIP_DESC: 'strip_desc',
+	STRIP_METER: 'strip_meter',
+	STRIP_GAIN: 'strip_gain',
+	STRIP_PAN: 'strip_pan',
+	STRIP_MUTE: 'strip_mute',
+	STRIP_PLUGIN_DESC: 'strip_plugin_desc',
+	STRIP_PLUGIN_ENABLE: 'strip_plugin_enable',
+	STRUP_PLUGIN_PARAM_DESC: 'strip_plugin_param_desc',
+	STRIP_PLUGIN_PARAM_VALUE: 'strip_plugin_param_value'
+});
+
+export class Message {
+
+	constructor (node, addr, val) {
+		this.node = node;
+		this.addr = addr;
+		this.val = [];
+
+		for (const i in val) {
+			if (val[i] >= JSON_INF) {
+				this.val.push(Infinity);
+			} else if (val[i] <= -JSON_INF) {
+				this.val.push(-Infinity);
+			} else {
+				this.val.push(val[i]);
+			}
+		}
+	}
+
+	static hash (node, addr) {
+		return [node].concat(addr || []).join('_');
+	}
+
+	static fromJsonText (jsonText) {
+		let rawMsg = JSON.parse(jsonText);
+		return new Message(rawMsg.node, rawMsg.addr || [], rawMsg.val);
+	}
+
+	toJsonText () {
+		let val = [];
+
+		for (const i in this.val) {
+			if (this.val[i] == Infinity) {
+				val.push(JSON_INF);
+			} else if (this.val[i] == -Infinity) {
+				val.push(-JSON_INF);
+			} else {
+				val.push(this.val[i]);
+			}
+		}
+		
+		return JSON.stringify({node: this.node, addr: this.addr, val: val});
+	}
+
+	get hash () {
+		return Message.hash(this.node, this.addr);
+	}
+
+	toString () {
+		return `${this.node} (${this.addr}) = ${this.val}`;
+	}
+
+}