优化文字长度计算

Author: gerow-x

lib/adapter/esc.js

@@ -60,13 +60,14 @@ escpos.Printer.prototype.tableCustomExt = function (data, encoding) {
     lineStr += ' '.repeat(obj.left)
 
     if (/CENTER/i.test(obj.align)) {
-      const spaces = (cellWidth - calWords(obj.text.trim())) / 2
+      const len = cellWidth - calWords(obj.text.trim())
+      const spaces = len / 2
       for (let j = 0; j < spaces; j++) {
         lineStr += ' '
       }
       if (obj.text !== '') { lineStr += obj.text.trim() }
 
-      for (let j = 0; j < spaces - 1; j++) {
+      for (let j = 0; j < len - Math.ceil(spaces); j++) {
         lineStr += ' '
       }
     } else if (/RIGHT/i.test(obj.align)) {

lib/utils.js

@@ -1,16 +1,9 @@
 'use strict'
 
-const wordWith = require('word-width')
+const eaw = require('eaw')
 
 const calWords = function (text) {
-  const pins = ["’", "√", "·"]
-  let len = wordWith(text)
-  for(let i=0;i<text.length;i++) {
-    if (pins.includes(text[i])) {
-      len ++
-    }
-  }
-  return len
+  return eaw.getWidth(text)
 }
 
 exports.calWords = calWords

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@posprint/command-builder",
-  "version": "0.0.40",
+  "version": "0.0.42",
   "description": "JavaScript library that implements the ESC/POS and TSC protocol to buffer.",
   "main": "index.js",
   "repository": {
@@ -23,12 +23,11 @@
     "README.md"
   ],
   "dependencies": {
+    "eaw": "^0.1.5",
     "escpos": "3.0.0-alpha.3",
     "is-chinese": "^1.2.9",
     "joi": "14.3.1",
-    "qrcode": "^1.4.4",
-    "word-width": "1.0.1",
-    "word-wrap": "1.2.3"
+    "qrcode": "^1.4.4"
   },
   "devDependencies": {
     "coveralls": "^3.1.0",