RPA.PDF
module RPA.PDF
class RPA.PDF.PDF
PDF is a library for managing PDF documents.
It can be used to extract text from PDFs, add watermarks to pages, and decrypt/encrypt documents.
Merging and splitting PDFs is supported by Add Files To PDF
keyword. Read
the keyword documentation for examples.
There is also limited support for updating form field values. (check
Set Field Value
and Save Field Values
for more info)
The input PDF file can be passed as an argument to the keywords, or it can be
omitted if you first call Open PDF
. A reference to the current active PDF will
be stored in the library instance and can be changed by using the Switch To PDF
keyword with another PDF file path, therefore you can asynchronously work with
multiple PDFs.
ATTENTION
Keep in mind that this library works with text-based PDFs, and it can’t
extract information from an image-based (scan) PDF file. For accurate
results, you have to use specialized external services wrapped by the
RPA.DocumentAI
library.
Portal example with video recording demo for parsing PDF invoices: https://github.com/robocorp/example-parse-pdf-invoice
Examples
Robot Framework
variable ROBOT_LIBRARY_DOC_FORMAT
variable ROBOT_LIBRARY_SCOPE
method add_files_to_pdf
Add images and/or pdfs to new PDF document.
Supports merging and splitting PDFs.
Image formats supported are JPEG, PNG and GIF.
The file can be added with extra properties by denoting : at the end of the filename. Each property should be separated by comma.
Supported extra properties for PDFs are:
- page and/or page ranges
- no extras means that all source PDF pages are added into new PDF
Supported extra properties for images are:
- format, the PDF page format, for example. Letter or A4
- rotate, how many degrees image is rotated counter-clockwise
- align, only possible value at the moment is center
- orientation, the PDF page orientation for the image, possible values P (portrait) or L (landscape)
- x/y, coordinates for adjusting image position on the page
Examples
Robot Framework
Python
Parameters
- files – list of filepaths to add into PDF (can be either images or PDFs)
- target_document – filepath of target PDF
- append – appends files to existing document if append is True
method add_library_components
method add_watermark_image_to_pdf
Add an image into an existing or new PDF.
If no source path is given, assume a PDF is already opened.
Examples
Robot Framework
Python
Parameters
- image_path – filepath to image file to add into PDF
- source – filepath to source, if not given add image to currently active PDF
- output_path – filepath of target PDF
- coverage – how the watermark image should be scaled on page, defaults to 0.2
method close_all_pdfs
Close all opened PDF file descriptors.
Examples
Robot Framework
method close_pdf
Close PDF file descriptor for a certain file.
Examples
Robot Framework
- Parameters: source_pdf – filepath to the source pdf.
- Raises: ValueError – if file descriptor for the file is not found.
method convert
Parse source PDF into entities.
These entities can be used for text searches or XML dumping for example. The conversion will be done automatically when using the dependent keywords directly.
Parameters
- source_path – source PDF filepath
- trim – trim whitespace from the text is set to True (default)
- pagenum – Page number where search is performed on, defaults to None. (meaning all pages get converted – numbers start from 1)
Examples
Robot Framework
Python
method decrypt_pdf
Decrypt PDF with password.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
Parameters
- source_path – filepath to the source pdf.
- output_path – filepath to the decrypted pdf.
- password – password as a string.
- Returns: True if decrypt was successful, else False or Exception.
- Raises: ValueError – on decryption errors.
method dump_pdf_as_xml
Get PDFMiner format XML dump of the PDF
Examples
Robot Framework
Python
- Parameters: source_path – filepath to the source PDF
- Returns: XML content as a string
method encrypt_pdf
Encrypt a PDF document.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
Parameters
- source_path – filepath to the source pdf.
- output_path – filepath to the target pdf, stored by default
in the robot output directory as
output.pdf
- user_pwd – allows opening and reading PDF with restrictions.
- owner_pwd – allows opening PDF without any restrictions, by default same user_pwd.
- use_128bit – whether to 128bit encryption, when false 40bit encryption is used, default True.
method extract_pages_from_pdf
Extract pages from source PDF and save to a new PDF document.
Page numbers start from 1.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
Parameters
- source_path – filepath to the source pdf.
- output_path – filepath to the target pdf, stored by default
in the robot output directory as
output.pdf
- pages – page numbers to extract from PDF (numbers start from 1) if None then extracts all pages.
method find_text
Find the closest text elements near the set anchor(s) through locator.
The PDF will be parsed automatically before elements can be searched.
Parameters
- locator – Element to set anchor to. This can be prefixed with either “text:”, “subtext:”, “regex:” or “coords:” to find the anchor by text or coordinates. The “text” strategy is assumed if no such prefix is specified. (text search is case-sensitive; use ignore_case param for controlling it)
- pagenum – Page number where search is performed on, defaults to 1 (first page).
- direction – In which direction to search for text elements. This can be any of ‘top’/’up’, ‘bottom’/’down’, ‘left’ or ‘right’. (defaults to ‘right’)
- closest_neighbours – How many neighbours to return at most, sorted by the distance from the current anchor.
- strict – If element’s margins should be used for matching those which are aligned to the anchor. (turned off by default)
- regexp – Expected format of the searched text value. By default all the candidates in range are considered valid neighbours.
- trim – Automatically trim leading/trailing whitespace from the text elements. (switched on by default)
- ignore_case – Do a case-insensitive search when set to True. (affects the passed locator and regexp filtering)
- Returns: A list of Match objects where every match has the following attributes: .anchor - the matched text with the locator; .neighbours - a list of adjacent texts found on the specified direction
ATTENTION
Keep in mind that this keyword works with text-based PDFs, and it can’t
extract information from an image-based (scan) PDF file. For accurate
results, you have to use specialized external services wrapped by the
RPA.DocumentAI
library.
Portal example with video recording demo for parsing PDF invoices: https://github.com/robocorp/example-parse-pdf-invoice
Examples
Robot Framework
Python
method get_all_figures
Return all figures in the PDF document.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
- Parameters: source_path – filepath to the source pdf.
- Returns: dictionary of figures divided into pages.
method get_input_fields
Get input fields in the PDF.
Stores input fields internally so that they can be used without parsing the PDF again.
Parameters
- source_path – Filepath to source, if not given use the currently active PDF.
- replace_none_value – Enable this to conveniently visualize the fields. ( replaces the null value with field’s default or its name if absent)
- encoding – Use an explicit encoding for field name/value parsing. ( defaults to “iso-8859-1” but “utf-8/16” might be the one working for you)
- Returns: A dictionary with all the found fields. Use their key names when setting values into them.
- Raises: KeyError – If no input fields are enabled in the PDF.
Examples
Robot Framework
Python
method get_keyword_arguments
method get_keyword_documentation
method get_keyword_names
method get_keyword_source
method get_keyword_tags
method get_keyword_types
method get_number_of_pages
Get number of pages in the document.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
- Parameters: source_path – filepath to the source pdf
- Raises: PdfReadError – if file is encrypted or other restrictions are in place
method get_pdf_info
Get metadata from a PDF document.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
- Parameters: source_path – filepath to the source PDF.
- Returns: dictionary of PDF information.
method get_text_from_pdf
Get text from set of pages in source PDF document.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
Parameters
- source_path – filepath to the source pdf.
- pages – page numbers to get text (numbers start from 1).
- details – set to True to return textboxes, default False.
- trim – set to False to return raw texts, default True means whitespace is trimmed from the text
- Returns: dictionary of pages and their texts.
method html_to_pdf
Generate a PDF file from HTML content.
Note that input must be well-formed and valid HTML.
Examples
Robot Framework
Python
Parameters
- content – HTML content
- output_path – filepath where to save the PDF document
- encoding – codec used for text I/O
- margin – page margin, default is set to 0
- working_directory – directory where to look for HTML linked resources, by default uses the current working directory
method is_pdf_encrypted
Check if PDF is encrypted.
If no source path given, assumes a PDF is already opened.
- Parameters: source_path – filepath to the source pdf.
- Returns: True if file is encrypted.
Examples
Robot Framework
Python
method open_pdf
Open a PDF document for reading.
This is called automatically in the other PDF keywords when a path to the PDF file is given as an argument.
Examples
Robot Framework
Python
- Parameters: source_path – filepath to the source pdf.
- Raises: ValueError – if PDF is already open.
method rotate_page
Rotate pages in source PDF document and save to target PDF document.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
Parameters
- pages – page numbers to extract from PDF (numbers start from 1).
- source_path – filepath to the source pdf.
- output_path – filepath to the target pdf, stored by default
in the robot output directory as
output.pdf
- clockwise – directorion that page will be rotated to, default True.
- angle – number of degrees to rotate, default 90.
method run_keyword
method save_field_values
Save field values in PDF if it has fields.
Parameters
- source_path – Source PDF with fields to update.
- output_path – Updated target PDF.
- newvals – New values when updating many at once.
- use_appearances_writer – For some PDF documents the updated fields won’t be visible (or will look strange). When this happens, try to set this to True so the previewer will re-render these based on the actual values. (and viewing the output PDF in a browser might display the field values correcly then)
Examples
Robot Framework
Python
method save_figure_as_image
Try to save the image data from Figure object, and return the file name, if successful.
Figure needs to have byte stream and that needs to be recognized as image format for successful save.
Examples
Robot Framework
Python
Parameters
- figure – PDF Figure object which will be saved as an image. The PDF Figure object can be determined from the Get All Figures keyword
- images_folder – directory where image files will be created
- file_prefix – image filename prefix
- Returns: image filepath or None
method save_figures_as_images
Save figures from given PDF document as image files.
If no source path given, assumes a PDF is already opened.
Examples
Robot Framework
Python
Parameters
- source_path – filepath to PDF document
- images_folder – directory where image files will be created
- pages – target figures in the pages, can be single page or range, default None means that all pages are scanned for figures to save (numbers start from 1)
- file_prefix – image filename prefix
- Returns: list of image filenames created
method save_pdf
Save the contents of a pypdf reader to a new file.
Examples
Robot Framework
Python
Parameters
- output_path – filepath to target PDF
- reader – a pypdf reader (defaults to currently active document)
method set_anchor_to_element
Sets main anchor point in the document for further searches.
This is used internally in the library and can work with multiple anchors at the same time if such are found.
Parameters
- locator – Element to set anchor to. This can be prefixed with either “text:”, “subtext:”, “regex:” or “coords:” to find the anchor by text or coordinates. The “text” strategy is assumed if no such prefix is specified. (text search is case-sensitive; use ignore_case param for controlling it)
- trim – Automatically trim leading/trailing whitespace from the text elements. (switched on by default)
- pagenum – Page number where search is performed on, defaults to 1 (first page).
- ignore_case – Do a case-insensitive search when set to True.
- Returns: True if at least one anchor was found.
Examples
Robot Framework
Python
method set_convert_settings
Change settings for PDFMiner document conversion.
line_margin controls how textboxes are grouped - if conversion results in texts grouped into one group then set this to lower value
word_margin controls how spaces are inserted between words - if conversion results in text without spaces then set this to lower value
char_margin controls how characters are grouped into words - if conversion results in individual characters instead of then set this to higher value
boxes_flow controls how much horizontal and vertical position of the text matters when determining the order of text boxes. Value can be between range of -1.0 (only horizontal position matters) to +1.0 (only vertical position matters). This feature (advanced layout analysis) can be disabled by setting value to None thus bottom left corner of the text box is used to determine order of the text boxes.
Parameters
- line_margin – relative margin between bounding lines, default 0.5
- word_margin – relative margin between words, default 0.1
- char_margin – relative margin between characters, default 2.0
- boxes_flow – positioning of the text boxes based on text, default 0.5
Examples
Robot Framework
Python
method set_field_value
Set value for field with given name on the active document.
Tries to match with field’s identifier directly or its label. When ticking checkboxes, try with the /Yes string value as simply Yes might not work with most previewing apps.
Parameters
- field_name – Field to update.
- value – New value for the field.
- source_path – Source PDF file path.
- Raises: ValueError – When field can’t be found or more than one field matches the given field_name.
Examples
Robot Framework
Python
method switch_to_pdf
Switch library’s current fileobject to already opened file or open a new file if not opened.
This is done automatically in the PDF library keywords.
Examples
Robot Framework
Python
- Parameters: source_path – filepath to the source pdf.
- Raises: ValueError – if PDF filepath is not given and there are no active file to activate.
method template_html_to_pdf
Use HTML template file to generate PDF file.
It provides an easy method of generating a PDF document from an HTML formatted template file.
Examples
Robot Framework
Python
Parameters
- template – filepath to the HTML template
- output_path – filepath where to save PDF document
- variables – dictionary of variables to fill into template, defaults to {}
- encoding – codec used for text I/O
- margin – page margin, default is set to 0
- working_directory – directory where to look for HTML linked resources, by default uses the current working directory