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index.js
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index.js
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const { createCanvas } = require('canvas');
const fs = require('fs');
const customJoiningCharacter = '@'; // String.fromCharCode(0x7); // bell
const debug = false;
const lineHeight = 60;
// Create a new canvas
const canvas = createCanvas(400, 5 * lineHeight);
const ctx = canvas.getContext('2d');
// Set the background color
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Set the font properties
ctx.font = '24px Arial';
function shouldMerge(string1, string2) {
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillText(`${string1}${string2}`, 0, lineHeight);
const parts = [string1, string2];
let offset = 0;
for (var part of parts) {
ctx.fillText(part, offset, 3 * lineHeight);
offset += ctx.measureText(part).width;
}
if (offset === 0) {
// the total width is zero
return false;
}
var imageData1 = ctx.getImageData(0, 0, offset, 2 * lineHeight);
var imageData2 = ctx.getImageData(0, 2 * lineHeight, offset, 2 * lineHeight);
var sum1 = 0;
var sum2 = 0;
for (var i = 0; i < imageData1.data.length; i++) {
sum1 += imageData1.data[i];
sum2 += imageData2.data[i];
}
if (sum1 === 0) {
debug && console.log('string1string2 does not display anything')
return false;
}
if (Math.abs(sum1 - sum2) / sum1 > 0.001) {
debug && console.log(`the parts ${string1}, ${string2} should be merged, sum1=${sum1}, sum2=${sum2}, ratio=${Math.abs(sum1 - sum2) / sum1}`);
return true;
}
debug && console.log(`the parts ${string1}, ${string2} should not be merged, sum1=${sum1}, sum2=${sum2}, ratio=${Math.abs(sum1 - sum2) / sum1}`);
return false;
}
function merge(parts) {
let i = 0;
while (i < parts.length - 1) {
if (shouldMerge(parts[i], parts[i + 1])) {
debug && save(`${i}-${parts[i]}-${parts[i + 1]}.png`);
parts.splice(i, 2, parts[i] + parts[i + 1]);
i = 0;
continue;
}
debug && save(`${i}-${parts[i]}-${parts[i + 1]}.png`);
i++;
}
return parts;
}
function save(filename) {
const base64Data = canvas.toDataURL().replace(/^data:image\/png;base64,/, '');
fs.writeFileSync(filename, base64Data, 'base64');
}
function printParts(parts, filename) {
ctx.clearRect(0, 0, canvas.width, canvas.height);
let offset = 0;
for (var part of parts) {
ctx.fillText(part, offset, 3 * lineHeight);
offset += ctx.measureText(part).width;
}
save(filename);
}
function partsToMarkedString(parts) {
let result = '';
for (const part of parts) {
result += [...part].join(customJoiningCharacter);
}
return result;
}
// "Hallo" -> ["H", "a", "l", "l", "o"]
// "H@all@o" -> ["Ha", "l", "lo"]
// "H@a@llo" -> ["Hal", "l", "o"]
function markedStringToParts(markedString) {
const result = [];
if (markedString.length === 0 || markedString[0] === customJoiningCharacter) {
return result;
}
let currentPart = markedString[0];
for (let i = 1; i < markedString.length; ++i) {
if (markedString[i] === customJoiningCharacter) {
continue;
}
if (markedString[i - 1] === customJoiningCharacter) {
currentPart += markedString[i]
} else {
result.push(currentPart);
currentPart = markedString[i]
}
}
result.push(currentPart);
return result;
}
// const tmp = 'क्';
// console.log('bell', String.fromCharCode(0x7))
// const zwj = tmp[2];
// const input = 'क्';
// const text = `${input[0]}${String.fromCharCode(0x7)}${input[1]}`; // 'क्ष'; //'क्'; //'បឹងទន្លេសាប'; // 'ក្រុងសៀមរាប'; // 'ถนนราชบพิธ'; // 'မြေတွေလှရွှေတေ'; // 'ক্রেসেন্ট লেক'; //'मुंबई'; //'မြန်မာOliverအက္ခရာ सुताजे'
//
//
// console.log(text.length)
// const parts = [...text];
//
// printParts(parts, 'before.png');
// console.log('before', parts)
//
// merge(parts);
//
// printParts(parts, 'after.png');
// console.log('after', parts)
//
const express = require('express');
const app = express();
const port = 3000;
app.use(express.json());
app.get('/get_marked_string/:input', (req, res) => {
const input = req.params.input;
const parts = [...input];
merge(parts);
const markedString = encodeURI(partsToMarkedString(parts));
res.json(markedString);
});
app.listen(port, () => {
console.log(`Server is running on port ${port}`);
});