Press n or j to go to the next uncovered block, b, p or k for the previous block.
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enum RelativeDirections {
None = 0,
Left,
Right,
Top,
Bottom,
}
export class Rectangle {
public id: number;
public x: number;
public y: number;
public width: number;
public height: number;
public x2: number;
public y2: number;
public text: string;
constructor(id: number, x: number, y: number, width: number, height: number) {
this.id = id;
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.x2 = x + width;
this.y2 = y + height;
this.text = '';
}
public toString(): string {
return `${this.id} ${this.text}`;
}
public tryAddText(item: TextItem) {
const x = item.transform[4];
const y = item.transform[5];
const isInside = x >= this.x && y >= this.y && x <= this.x2 && y <= this.y2;
if (isInside) {
if (item.str?.length === 0 && this.text.length === 0) {
return true;
}
this.text += `${item.str}${item.hasEOL ? '\n' : ''}`;
return true;
}
return false;
}
public isNeighbour(rect: Rectangle, distance: number = 1): RelativeDirections {
const result: RelativeDirections = RelativeDirections.None;
const heightOk = Math.abs(this.height - rect.height) < distance;
const yOk = Math.abs(this.y - rect.y) < distance;
if (heightOk && yOk) {
const isLeft = Math.abs(this.x - rect.x2) < distance;
if (isLeft) return RelativeDirections.Left;
const isRight = Math.abs(this.x2 - rect.x) < distance;
if (isRight) return RelativeDirections.Right;
}
const widthOk = Math.abs(this.width - rect.width) < distance;
const xOk = Math.abs(this.x - rect.x) < distance;
if (widthOk && xOk) {
const isTop = Math.abs(this.y - rect.y2) < distance;
if (isTop) return RelativeDirections.Top;
const isBottom = Math.abs(this.y2 - rect.y) < distance;
if (isBottom) return RelativeDirections.Bottom;
}
return result;
}
}
type TableRow = Array<Rectangle>;
export class Table {
public grid: Array<TableRow>;
private minTableX1: number = Number.MAX_VALUE;
private minTableY1: number = Number.MAX_VALUE;
private maxTableX2: number = Number.MIN_VALUE;
private maxTableY2: number = Number.MIN_VALUE;
constructor(rect: Rectangle) {
this.grid = [[rect]];
}
private _cellCount: number = -1;
public get cellCount(): number {
if (this._cellCount > -1) {
return this._cellCount;
}
for (const row of this.grid) {
this._cellCount += row.length;
}
return this._cellCount;
}
public get width(): number {
return this.maxTableX2 - this.minTableX1;
}
public get height(): number {
return this.maxTableY2 - this.minTableY1;
}
public static tryAddText(pageTables: Array<Table>, item: TextItem): boolean {
for (const table of pageTables) {
if (table.cellCount < 3) continue;
if (table.isInside(item)) {
for (const row of table.grid) {
for (const rectangle of row) {
const res = rectangle.tryAddText(item);
if (res) return true;
}
}
}
}
return false;
}
public static addRectangle(pageTables: Array<Table>, rect: Rectangle): boolean {
for (const table of pageTables) {
for (let rowIndex = 0; rowIndex < table.grid.length; rowIndex++) {
const row = table.grid[rowIndex];
for (let colIndex = 0; row && colIndex < row.length; colIndex++) {
const currentRect = row[colIndex];
const dir = currentRect?.isNeighbour(rect);
if (dir === RelativeDirections.Right) {
row.push(rect);
return true;
}
if (dir === RelativeDirections.Bottom) {
const bottomRow = table.grid[rowIndex + 1];
if (bottomRow === undefined) {
const newRow: TableRow = [rect];
table.grid.push(newRow);
return true;
}
}
if (dir === RelativeDirections.Left || dir === RelativeDirections.Top) {
// TODO remove
// debugger;
}
}
}
}
pageTables.push(new Table(rect));
return true;
}
public getTableArray(): Array<Array<string>> {
const result: Array<Array<string>> = [];
for (const row of this.grid) {
const rowStr: Array<string> = [];
for (const rect of row) {
rowStr.push(rect.text.trim());
}
result.push(rowStr);
}
return result;
}
public initMinMax(): void {
const firstRow = this.grid[0];
const lastRow = this.grid[this.grid.length - 1];
if (firstRow === undefined || lastRow === undefined) {
throw new Error('malformed table');
}
const firstRect = firstRow[0];
const lastRect = lastRow[lastRow.length - 1];
if (firstRect === undefined || lastRect === undefined) {
throw new Error('malformed table');
}
this.minTableX1 = firstRect.x;
this.minTableY1 = firstRect.y;
this.maxTableX2 = lastRect.x2;
this.maxTableY2 = lastRect.y2;
}
public isInside(item: TextItem) {
const x = item.transform[4];
const y = item.transform[5];
return x >= this.minTableX1 && y >= this.minTableY1 && x <= this.maxTableX2 && y <= this.maxTableY2;
}
public toString(): string {
const result: Array<string> = [];
for (const row of this.grid) {
const rowStr = row.map((i) => i.text).join('\t');
result.push(rowStr);
}
return result.join('\n');
}
}
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