Template injection function extended to multiple fields; tests added and adjusted

src/pyladoc/__init__.py

@@ -246,30 +246,40 @@ def _create_document_writer() -> 'DocumentWriter':
     return new_dwr
 
 
-def inject_to_template(content: str, template_path: str = '', internal_template: str = '') -> str:
+def inject_to_template(fields_dict: dict[str, str],
+                       template_path: str = '',
+                       internal_template: str = '',
+                       template_string: str = '',
+                       ) -> str:
     """
-    injects a content string into a template. The placeholder <!--CONTENT-->
+    injects content fields into a template. The placeholder <!--CONTENT-->
     will be replaced by the content. If the placeholder is prefixed with a
     '%' comment character, this character will be replaced as well.
 
     Args:
+        fields_dict: A dictionary with field names as keys and content as values
         template_path: Path to a template file
         internal_template: Path to a internal default template
+        template_string: A template string to use directly
 
     Returns:
         Template with included content
     """
+    assert isinstance(fields_dict, dict), 'fields_dict must be a dictionary'
     if template_path:
         with open(template_path, 'r') as f:
             template = f.read()
     elif internal_template:
         template = _get_pkgutil_string(internal_template)
+    elif template_string:
+        template = template_string
     else:
         raise Exception('No template provided')
 
-    assert '<!--CONTENT-->' in template, 'No <!--CONTENT--> expression in template located'
+    def replace_field(match: re.Match[str]) -> str:
-    prep_template = re.sub(r"\%?\s*<!--CONTENT-->", '<!--CONTENT-->', template)
+        return fields_dict.get(match.group(1), match.string)
-    return prep_template.replace('<!--CONTENT-->', content)
+
+    return re.sub(r"(?:\%+\s*)?\<!--(.*?)-->", replace_field, template)
 
 
 class DocumentWriter():
@@ -675,6 +685,7 @@ class DocumentWriter():
                font_family: Literal[None, 'serif', 'sans-serif'] = None,
                table_renderer: TRenderer = 'simple',
                latex_template_path: str = '',
+               fields_dict: dict[str, str] = {},
                figure_scale: float = 1,
                engine: latex.LatexEngine = 'pdflatex') -> bool:
         """
@@ -683,15 +694,21 @@ class DocumentWriter():
         Args:
             file_path: The path to save the PDF file to
             font_family: Overwrites the front family for figures and the template
+            table_renderer: The renderer for tables (simple: renderer with column type
+                guessing for text and numbers; pandas: using the internal pandas LaTeX renderer)
             latex_template_path: Path to a LaTeX template file. The
                 expression <!--CONTENT--> will be replaced by the generated content.
                 If no path is provided a default template is used.
+            fields_dict: A dictionary with field names as keys and content as values
+                replacing the placeholders <!--KEY--> in the template.
+            figure_scale: Scaling factor for the figure size
             engine: LaTeX engine (pdflatex, lualatex, xelatex or tectonic)
 
         Returns:
             True if the PDF file was successfully created
         """
-        latex_code = inject_to_template(self.to_latex(font_family, table_renderer, figure_scale),
+        content = self.to_latex(font_family, table_renderer, figure_scale)
+        latex_code = inject_to_template({'CONTENT': content},
                                         latex_template_path,
                                         'templates/default_template.tex')
 

tests/document_validation.py

@@ -50,7 +50,7 @@ def validate_html(html_string: str, validate_online: bool = False, check_for: li
         assert tag_type in tags, f"Tag {tag_type} not found in the html code"
 
     if validate_online:
-        test_page = pyladoc.inject_to_template(html_string, internal_template='templates/test_template.html')
+        test_page = pyladoc.inject_to_template({'CONTENT': html_string}, internal_template='templates/test_template.html')
         validation_result = validate_html_with_w3c(test_page)
         assert 'messages' in validation_result, 'Validate request failed'
         if validation_result['messages']:

tests/test_rendering_example1_doc.py

@@ -158,7 +158,7 @@ def test_html_render():
 
     if WRITE_RESULT_FILES:
         with open('tests/out/test_html_render1.html', 'w', encoding='utf-8') as f:
-            f.write(pyladoc.inject_to_template(html_code, internal_template='templates/test_template.html'))
+            f.write(pyladoc.inject_to_template({'CONTENT': html_code}, internal_template='templates/test_template.html'))
 
 
 def test_latex_render():

tests/test_rendering_example2_doc.py

@@ -90,9 +90,11 @@ def test_html_render():
 
     document_validation.validate_html(html_code, VALIDATE_HTML_CODE_ONLINE)
 
+    title = 'Test HTML Render 2'
+
     if WRITE_RESULT_FILES:
         with open('tests/out/test_html_render2.html', 'w', encoding='utf-8') as f:
-            f.write(pyladoc.inject_to_template(html_code, internal_template='templates/test_template.html'))
+            f.write(pyladoc.inject_to_template({'CONTENT': html_code}, internal_template='templates/test_template.html'))
 
 
 def test_latex_render():

tests/test_template_functions.py

@@ -0,0 +1,28 @@
+import pyladoc
+
+def test_inject_to_template():
+    template = """
+    <!DOCTYPE html>
+    <html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <title><!--TITLE--></title>
+    </head>
+    <!-- some comment -->
+    <body>
+        <!--CONTENT-->
+    </body>
+    </html>
+    """
+    
+    content = "Hello, World!"
+    title = "Test Title"
+
+    
+    result = pyladoc.inject_to_template({'CONTENT': content, 'TITLE': title},template_string=template)
+
+    print(result)
+    
+    assert "Hello, World!" in result
+    assert "<title>Test Title</title>" in result