訂判斷及所需輸入
本例可用頁高八十毫米，前段佔七十二，同一明細行十二，內有 TOP、BOTTOM 兩半。餘八毫米不足。整行要求要把兩半移到第二頁，普通拆頁卻分在第一、二頁。
| 情況 | 輸入 JSON |
|---|---|
| 原例測試 | {"keepWhole":true} |
跑所附比較
瀏覽器真正產生記憶體 PDF，抽字可定位標記在哪頁。核對只限此固定排版及測試引擎，不推所有打印機，也未涵蓋整行比一頁還高的情況。
| 路徑 | 輸出 JSON |
|---|---|
| 錯誤路徑 | {"topPage":1,"bottomPage":2,"pageCount":2} |
| 所需路徑 | {"topPage":2,"bottomPage":2,"pageCount":2} |
import assert from 'node:assert/strict';
import {createRequire} from 'node:module';
import {pathToFileURL} from 'node:url';
const htmlEscape=s=>String(s).replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>').replace(/"/g,'"');
async function withPage(action,options={}){
const require=createRequire(import.meta.url);const {chromium}=require('playwright');
const browser=await chromium.launch({headless:true});
try{const context=await browser.newContext(options);const page=await context.newPage();
const requests=[];await page.route('**/*',route=>{requests.push(route.request().url());return route.abort();});
return await action(page,context,requests);
}finally{await browser.close();}
}
async function pdfObservation(html){
const bytes=await withPage(async page=>{await page.setContent(html);return page.pdf({preferCSSPageSize:true,printBackground:true});});
const require=createRequire(import.meta.url);
const {getDocument}=await import(pathToFileURL(require.resolve('pdfjs-dist/legacy/build/pdf.mjs')).href);
const loadingTask=getDocument({data:Uint8Array.from(bytes),useSystemFonts:true,disableFontFace:true});
try{const document=await loadingTask.promise;const pages=[];for(let n=1;n<=document.numPages;n++){
const page=await document.getPage(n);const content=await page.getTextContent();
pages.push(content.items.filter(x=>typeof x.str==='string'&&x.str).map(x=>({text:x.str,x:x.transform[4],y:x.transform[5]})));
}return {pageCount:document.numPages,pages};}finally{await loadingTask.destroy();}
}
const printStyle='<style>@page{size:100mm 100mm;margin:10mm}body{margin:0;font:10px Arial}p{margin:0}</style>';
const run=async function run(i,corrected=true){
if(typeof i.keepWhole!=='boolean')return {held:true};
const style='<style>.space{height:72mm}.row{'+(corrected&&i.keepWhole?'break-inside:avoid;':'')+'}.part{height:6mm;line-height:6mm;orphans:1;widows:1}</style>';
const out=await pdfObservation(printStyle+style+'<div class="space"></div><div class="row"><p class="part">TOP</p><p class="part">BOTTOM</p></div>');
return {topPage:out.pages.findIndex(p=>p.some(x=>x.text==='TOP'))+1,bottomPage:out.pages.findIndex(p=>p.some(x=>x.text==='BOTTOM'))+1,pageCount:out.pageCount};
};
const cases=[{"input":{"keepWhole":true},"corrected":false,"expected":{"topPage":1,"bottomPage":2,"pageCount":2}},{"input":{"keepWhole":true},"corrected":true,"expected":{"topPage":2,"bottomPage":2,"pageCount":2}},{"input":{"keepWhole":false},"corrected":true,"expected":{"topPage":1,"bottomPage":2,"pageCount":2}},{"input":{"keepWhole":null},"corrected":true,"expected":{"held":true}}];
for(const test of cases){const actual=await run(test.input,test.corrected);assert.deepEqual(actual,test.expected);console.log(actual);}
按邊界依據作判斷
明訂可拆，TOP 第一頁、BOTTOM 第二頁可接受；整行規則未知，打印前先停。
- 核餘位及行高
- 套整行條件
- 核新 PDF 的頁位置
整行超過頁高，須另訂延續方式。
| 條件 | 輸入 JSON | 預期輸出 JSON |
|---|---|---|
| 明准行可拆開 | {"keepWhole":false} | {"topPage":1,"bottomPage":2,"pageCount":2} |
| 整行要求未訂 | {"keepWhole":null} | {"held":true} |
原例要求整行，兩標記應在哪裏？
查看參考答案
都在第二頁。十二毫米行放不進第一頁餘下八毫米。