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PDF UL OL with line numbers

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Add UL LI PDF line numbers
This commit is contained in:
Sean Engelhardt 2019-02-14 15:27:23 +01:00
parent 2df284c82e
commit 5069371f5e
2 changed files with 227 additions and 30 deletions
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240
client/src/app/core/ui-services/html-to-pdf.service.ts
View File

@ -1,6 +1,14 @@
import { Injectable } from '@angular/core';
import { LineNumberingMode } from 'app/site/motions/models/view-motion';
/**
* Shape of line number objects
*/
interface LineNumberObject {
lineNumber: number;
marginBottom?: number;
}
/**
* Converts HTML strings to pdfmake compatible document definition.
*
@ -26,7 +34,7 @@ export class HtmlToPdfService {
/**
* Space between list elements
*/
private LI_MARGIN_BOTTOM = 1.5;
private LI_MARGIN_BOTTOM = 8;
/**
* Normal line height for paragraphs
@ -110,7 +118,7 @@ export class HtmlToPdfService {
const parser = new DOMParser();
const parsedHtml = parser.parseFromString(htmlText, 'text/html');
// Since the spread operator did not work for HTMLCollection, use Array.from
const htmlArray = Array.from(parsedHtml.body.childNodes);
const htmlArray = Array.from(parsedHtml.body.childNodes) as Element[];
// Parse the children of the current HTML element
for (const child of htmlArray) {
@ -129,7 +137,7 @@ export class HtmlToPdfService {
* @param styles holds the style attributes of HTML elements (`<div style="color: green">...`)
* @returns the doc def to the given element in consideration to the given paragraph and styles
*/
public parseElement(element: any, styles?: string[]): any {
public parseElement(element: Element, styles?: string[]): any {
const nodeName = element.nodeName.toLowerCase();
let classes = [];
let newParagraph: any;
@ -176,7 +184,8 @@ export class HtmlToPdfService {
case 'div': {
const children = this.parseChildren(element, styles);
if (this.lineNumberingMode === LineNumberingMode.Outside) {
// this introduces a bug with rendering sub-lists in PDF
if (this.lineNumberingMode === LineNumberingMode.Outside && !this.isInsideAList(element)) {
newParagraph = this.create('stack');
newParagraph.stack = children;
} else {
@ -184,7 +193,12 @@ export class HtmlToPdfService {
newParagraph.text = children;
}
newParagraph.margin = [0, this.getMarginBottom(nodeName)];
if (classes.includes('os-split-before')) {
newParagraph.listType = 'none';
} else {
newParagraph.marginBottom = this.getMarginBottom(nodeName);
}
newParagraph.lineHeight = this.LINE_HEIGHT;
const implicitStyles = this.computeStyle(this.elementStyles[nodeName]);
@ -212,7 +226,7 @@ export class HtmlToPdfService {
}
case 'span': {
// Line numbering feature, will prevent compatibility to most other projects
if (element.getAttribute('data-line-number')) {
if (element.getAttribute('data-line-number') && !this.isInsideAList(element)) {
if (this.lineNumberingMode === LineNumberingMode.Inside) {
// TODO: algorithm for "inline" line numbers is not yet implemented
} else if (this.lineNumberingMode === LineNumberingMode.Outside) {
@ -220,15 +234,7 @@ export class HtmlToPdfService {
newParagraph = {
columns: [
// the line number column
{
width: 20,
text: currentLineNumber,
color: 'gray',
fontSize: 8,
margin: [0, 2, 0, 0],
lineHeight: this.LINE_HEIGHT
},
// target to push text into the line
this.getLineNumberObject({ lineNumber: +currentLineNumber }),
{
text: []
}
@ -249,20 +255,70 @@ export class HtmlToPdfService {
}
case 'br': {
newParagraph = this.create('text');
// Add a dummy line, if the next tag is a BR tag again. The line could
// not be empty otherwise it will be removed and the empty line is not displayed
if (element.nextSibling && element.nextSibling.nodeName === 'BR') {
newParagraph.text.push(this.create('text', ' '));
}
// yep thats all
newParagraph.text = '\n';
newParagraph.lineHeight = this.LINE_HEIGHT;
break;
}
case 'ul':
case 'ol': {
newParagraph = this.create(nodeName);
const list = this.create(nodeName);
// keep the numbers of the ol list
if (nodeName === 'ol') {
const start = element.getAttribute('start');
if (start) {
list.start = +start;
}
}
// in case of line numbers and only of the list is not nested in another list.
if (this.lineNumberingMode === LineNumberingMode.Outside && !this.isInsideAList(element)) {
const lines = this.extractLineNumbers(element);
const cleanedChildDom = this.cleanLineNumbers(element);
const cleanedChildren = this.parseChildren(cleanedChildDom, styles);
if (lines.length > 0) {
const listCol = {
columns: [
{
width: 20,
stack: []
}
],
margin: [0, 0, 0, 0]
};
// For correction factor for "change reco" elements in lists, cause
// they open a new OL-List and have additional distance
if (
element.classList.contains('os-split-before') &&
element.classList.contains('os-split-after')
) {
listCol.margin = [0, -this.LI_MARGIN_BOTTOM, 0, -this.LI_MARGIN_BOTTOM];
} else if (!element.classList.contains('os-split-before')) {
listCol.margin = [0, 5, 0, 0];
}
for (const line of lines) {
listCol.columns[0].stack.push(this.getLineNumberObject(line));
}
list[nodeName] = cleanedChildren;
listCol.columns.push(list);
newParagraph = listCol;
} else {
// that is usually the case for "inserted" lists during change recomendations
list.margin = [20, 0, 0, 0];
newParagraph = list;
newParagraph[nodeName] = cleanedChildren;
}
} else {
const children = this.parseChildren(element, styles);
newParagraph = list;
newParagraph[nodeName] = children;
}
break;
}
default: {
@ -284,14 +340,15 @@ export class HtmlToPdfService {
* @param styles the styles array, usually just to parse back into the `parseElement` function
* @returns an array of parsed children
*/
private parseChildren(element: any, styles?: string[]): any {
const childNodes = element.childNodes;
private parseChildren(element: Element, styles?: Array<string>): Element[] {
const childNodes = Array.from(element.childNodes) as Element[];
const paragraph = [];
if (childNodes.length > 0) {
for (const child of childNodes) {
// skip empty child nodes
if (!(child.nodeName === '#text' && child.textContent.trim() === '')) {
const parsedElement = this.parseElement(child, styles);
const firstChild = element.firstChild as Element;
if (
// add the line number column
@ -304,9 +361,9 @@ export class HtmlToPdfService {
} else if (
// if the first child of the parsed element is line number
this.lineNumberingMode === LineNumberingMode.Outside &&
element.firstChild &&
element.firstChild.classList &&
element.firstChild.classList.contains('os-line-number')
firstChild &&
firstChild.classList &&
firstChild.classList.contains('os-line-number')
) {
const currentLine = paragraph.pop();
// push the parsed element into the "text" array
@ -321,6 +378,135 @@ export class HtmlToPdfService {
return paragraph;
}
/**
* Helper function to make a line-number object
*
* @param line and object in the shape: { lineNumber: X }
* @returns line number as pdfmake-object
*/
private getLineNumberObject(line: LineNumberObject): object {
return {
width: 20,
text: [
{
// Add a blank with the normal font size here, so in rare cases the text
// is rendered on the next page and the line number on the previous page.
text: ' ',
fontSize: 10,
decoration: ''
},
{
text: line.lineNumber,
color: 'gray',
fontSize: 8
}
],
marginBottom: line.marginBottom,
lineHeight: this.LINE_HEIGHT
};
}
/**
* Cleans the elements children from line-number spans
*
* @param element a html dom tree
* @returns a DOM element without line number spans
*/
private cleanLineNumbers(element: Element): Element {
const elementCopy = element.cloneNode(true) as Element;
const children = elementCopy.childNodes;
// using for-of did not work as expected
for (let i = 0; i < children.length; i++) {
if (this.getLineNumber(children[i] as Element)) {
children[i].remove();
}
if (children[i].childNodes.length > 0) {
const cleanChildren = this.cleanLineNumbers(children[i] as Element);
elementCopy.replaceChild(cleanChildren, children[i]);
}
}
return elementCopy;
}
/**
* Helper function to extract line numbers from child elements
*
* TODO: Cleanup
*
* @param element element to check for containing line numbers (usually a list)
* @returns a list with the line numbers
*/
private extractLineNumbers(element: Element): LineNumberObject[] {
let foundLineNumbers = [];
const lineNumber = this.getLineNumber(element);
if (lineNumber) {
foundLineNumbers.push({ lineNumber: lineNumber });
} else if (element.nodeName === 'BR') {
// Check if there is a new line, but it does not get a line number.
// If so, insert a dummy line, so the line numbers stays aligned with
// the text.
if (!this.getLineNumber(element.nextSibling as Element)) {
foundLineNumbers.push({ lineNumber: '' });
}
} else {
const children = Array.from(element.childNodes) as Element[];
let childrenLength = children.length;
let childrenLineNumbers = [];
for (let i = 0; i < children.length; i++) {
childrenLineNumbers = childrenLineNumbers.concat(this.extractLineNumbers(children[i]));
if (children.length < childrenLength) {
i -= childrenLength - children.length;
childrenLength = children.length;
}
}
// If this is an list item, add some space to the lineNumbers:
if (childrenLineNumbers.length && element.nodeName === 'LI') {
childrenLineNumbers[childrenLineNumbers.length - 1].marginBottom = this.LI_MARGIN_BOTTOM;
}
foundLineNumbers = foundLineNumbers.concat(childrenLineNumbers);
}
return foundLineNumbers;
}
/**
* Recursive helper function to determine if the element is inside a list
*
* @param element the current html node
* @returns wheater the element is inside a list or not
*/
private isInsideAList(element: Element): boolean {
let parent = element.parentNode;
while (parent !== null) {
if (parent.nodeName === 'UL' || parent.nodeName === 'OL') {
return true;
}
parent = parent.parentNode;
}
return false;
}
/**
* Helper function to safer extract a line number from an element
*
* @param element
* @returns the line number of the element
*/
private getLineNumber(element: Element): number {
if (
element &&
element.nodeName === 'SPAN' &&
element.getAttribute('class') &&
element.getAttribute('class').indexOf('os-line-number') > -1
) {
return +element.getAttribute('data-line-number');
}
}
/**
* Extracts the style information from the given array
*

13
client/src/app/site/motions/services/motion-pdf.service.ts
View File

@ -315,7 +315,18 @@ export class MotionPdfService {
}
// summary of change recommendations (for motion diff version only)
const changeRecos = this.changeRecoRepo.getChangeRecoOfMotion(motion.id);
const changeRecos = this.changeRecoRepo
.getChangeRecoOfMotion(motion.id)
.sort((a: ViewUnifiedChange, b: ViewUnifiedChange) => {
if (a.getLineFrom() < b.getLineFrom()) {
return -1;
} else if (a.getLineFrom() > b.getLineFrom()) {
return 1;
} else {
return 0;
}
});
if (crMode === ChangeRecoMode.Diff && changeRecos.length > 0) {
const columnLineNumbers = [];
const columnChangeType = [];