Include SVG as available output format for saving table to file

[claysmyth]

Prework

• [X ] Read and abide by the great_tables code of conduct and contributing guidelines.
• [ X] Search for duplicates among the existing issues (both open and closed).

Proposal

The ability to save tables to SVG file format would be very useful for including GreatTables into composite scientific figures! Albeit, I am ignorant on how large of an undertaking this may be.

[MarekOzana]

SVG output would be great! I am using Typst and it cannot import pdfs only svg.

[claysmyth]

I added the following the _save_screenshot in _export.py that does the trick. Kluge fix, so not creating a pull request.

if path.endswith(".svg"):
        # Get the table HTML content
        table_html = driver.find_element(by=By.TAG_NAME, value="table").get_attribute('outerHTML')
        
        # # Import svg converter
        # _try_import(name="svgwrite", pip_install_line="pip install svgwrite")
        # import svgwrite
        
        # # Create SVG drawing
        # dwg = svgwrite.Drawing(path, size=(f"{required_width}px", f"{required_height}px"))
        
        # # Create foreignObject element with proper namespace
        # foreign = dwg.add(dwg.g().add(svgwrite.container.SVG(
        #     insert=(0, 0),
        #     size=(required_width, required_height)
        # )))
        # foreign.set_desc(title='Table HTML', desc=table_html)
        
        # # Save the SVG
        # dwg.save()
        # 
        #
        # Get any styles from the head
        # Get any styles from the head
        styles = driver.execute_script("""
            var styles = '';
            // Get stylesheet rules
            var styleSheets = document.styleSheets;
            for(var i = 0; i < styleSheets.length; i++) {
                try {
                    var rules = styleSheets[i].cssRules;
                    for(var j = 0; j < rules.length; j++) {
                        styles += rules[j].cssText + '\\n';
                    }
                } catch (e) {
                    console.log('Error reading stylesheet:', e);
                }
            }
            
            // Get computed styles for each element
            var table = document.getElementsByTagName('table')[0];
            var elements = table.getElementsByTagName('*');
            var computedStyles = {};
            
            // Important style properties to capture
            var styleProps = [
                'font-family', 'font-size', 'font-weight', 'color', 
                'background-color', 'border', 'border-color', 'border-width',
                'border-style', 'padding', 'margin', 'text-align', 'vertical-align',
                'width', 'height', 'display', 'position', 'top', 'left',
                'border-collapse', 'border-spacing', 'line-height',
                'border-top', 'border-bottom', 'border-left', 'border-right',
                'padding-top', 'padding-bottom', 'padding-left', 'padding-right',
                'background', 'white-space', 'text-decoration', 'font-style'
            ];
            
            // Capture styles for each element with a class
            for (var i = 0; i < elements.length; i++) {
                var el = elements[i];
                if (el.className) {
                    var computed = window.getComputedStyle(el);
                    var classStyles = '';
                    styleProps.forEach(function(prop) {
                        var value = computed.getPropertyValue(prop);
                        if (value) {
                            classStyles += prop + ':' + value + ';';
                        }
                    });
                    if (classStyles) {
                        styles += '.' + el.className.replace(/ /g, '.') + '{' + classStyles + '}\\n';
                    }
                }
            }
            return styles;
        """)
        
        # Function to escape XML attribute content
        def escape_xml_attr(s):
            return (s.replace("&", "&amp;")
                    .replace("<", "&lt;")
                    .replace(">", "&gt;")
                    .replace('"', "&quot;")
                    .replace("'", "&apos;"))
        
        # Process table HTML to escape attributes properly
        import re
        def escape_html_attrs(html):
            def replace_attr(match):
                attr_name = match.group(1)
                attr_value = match.group(2)
                escaped_value = escape_xml_attr(attr_value)
                return f'{attr_name}="{escaped_value}"'
            
            # Find and escape attribute values
            pattern = r'(\w+)="([^"]*)"'
            return re.sub(pattern, replace_attr, html)
        
        # Clean up table HTML first
        table_html = (
            table_html
            .replace("&nbsp;", "&#160;")  # Replace HTML entities with XML entities
            .replace("<em>", "<span style='font-style: italic'>")  # Convert em to styled span
            .replace("</em>", "</span>")  # Close styled span
        )
        
        # Then escape attributes
        table_html = escape_html_attrs(table_html)
        
        # Create SVG wrapper with embedded styles
        svg_content = f'''<?xml version="1.0" encoding="UTF-8" standalone="no"?>
        <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
             width="{required_width}" height="{required_height}">
            <foreignObject width="100%" height="100%">
                <div xmlns="http://www.w3.org/1999/xhtml">
                    <style>
                        /* Base table styles */
                        table {{
                            border-collapse: collapse;
                            border-spacing: 0;
                            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", sans-serif;
                            width: 100%;
                        }}
                        th, td {{
                            padding: 8px;
                            border: 1px solid #ddd;
                        }}
                        th {{
                            background-color: #f8f9fa;
                            font-weight: bold;
                        }}
                        {styles}
                    </style>
                    {table_html}
                </div>
            </foreignObject>
        </svg>
        '''
        
        # Final cleanup of any remaining issues
        svg_content = (
            svg_content
            .replace("&amp;#", "&#")  # Fix double-escaped numeric entities
            .replace("&amp;amp;", "&amp;")  # Fix double-escaped ampersands
        )
        
        # Save the SVG file
        with open(path, 'w', encoding='utf-8') as f:
            f.write(svg_content)