643 lines
24 KiB
Python
643 lines
24 KiB
Python
#!/usr/bin/env python3
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"""
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Simple HTML Browser using pyWebLayout
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This browser can render basic HTML content using the pyWebLayout concrete objects.
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It supports text, images, links, forms, and basic styling.
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"""
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import re
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import tkinter as tk
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from tkinter import ttk, messagebox, filedialog, simpledialog
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from PIL import Image, ImageTk
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from typing import Dict, List, Optional, Tuple, Any
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import webbrowser
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import os
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from urllib.parse import urljoin, urlparse
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import requests
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from io import BytesIO
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# Import pyWebLayout components
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from pyWebLayout.concrete import (
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Page, Container, Box, Text, RenderableImage,
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RenderableLink, RenderableButton, RenderableForm, RenderableFormField
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)
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from pyWebLayout.abstract.functional import (
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Link, Button, Form, FormField, LinkType, FormFieldType
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)
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from pyWebLayout.style.fonts import Font, FontWeight, FontStyle, TextDecoration
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from pyWebLayout.style.layout import Alignment
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class HTMLParser:
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"""Simple HTML parser that converts HTML to pyWebLayout objects"""
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def __init__(self):
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self.font_stack = [Font(font_size=14)] # Default font
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self.current_container = None
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def parse_html_string(self, html_content: str, base_url: str = "") -> Page:
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"""Parse HTML string and return a Page object"""
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# Create the main page
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page = Page(size=(800, 1600), background_color=(255, 255, 255))
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self.current_container = page
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self.base_url = base_url
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# Simple HTML parsing using regex (not production-ready, but works for demo)
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# Remove comments and scripts
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html_content = re.sub(r'<!--.*?-->', '', html_content, flags=re.DOTALL)
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html_content = re.sub(r'<script.*?</script>', '', html_content, flags=re.DOTALL)
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html_content = re.sub(r'<style.*?</style>', '', html_content, flags=re.DOTALL)
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# Extract title
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title_match = re.search(r'<title>(.*?)</title>', html_content, re.IGNORECASE)
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if title_match:
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page.title = title_match.group(1)
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# Extract body content
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body_match = re.search(r'<body[^>]*>(.*?)</body>', html_content, re.DOTALL | re.IGNORECASE)
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if body_match:
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body_content = body_match.group(1)
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else:
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# If no body tag, use the entire content
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body_content = html_content
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# Parse the body content
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self._parse_content(body_content, page)
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return page
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def parse_html_file(self, file_path: str) -> Page:
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"""Parse HTML file and return a Page object"""
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try:
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with open(file_path, 'r', encoding='utf-8') as f:
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html_content = f.read()
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base_url = os.path.dirname(os.path.abspath(file_path))
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return self.parse_html_string(html_content, base_url)
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except Exception as e:
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# Create error page
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page = Page(size=(800, 1600), background_color=(255, 255, 255))
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error_text = Text(f"Error loading file: {str(e)}", Font(font_size=16, colour=(255, 0, 0)))
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page.add_child(error_text)
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return page
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def _parse_content(self, content: str, container: Container):
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"""Parse HTML content and add elements to container"""
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# Simple token-based parsing
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tokens = self._tokenize_html(content)
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i = 0
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while i < len(tokens):
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token = tokens[i]
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if token['type'] == 'text':
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if token['content'].strip(): # Only add non-empty text
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text_obj = Text(token['content'].strip(), self.font_stack[-1])
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container.add_child(text_obj)
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elif token['type'] == 'tag':
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# Handle the tag and potentially parse content between opening and closing tags
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i = self._handle_tag_with_content(token, tokens, i, container)
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continue
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i += 1
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def _handle_tag_with_content(self, token, tokens, current_index, container):
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"""Handle tags and their content, returning the new index position"""
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tag_name = token['name']
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is_closing = token['closing']
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if is_closing:
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# Handle closing tags
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if tag_name in ['b', 'strong', 'i', 'em', 'u', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
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if len(self.font_stack) > 1: # Don't pop the last font
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self.font_stack.pop()
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return current_index + 1
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# For opening tags that affect text styling, parse their content with the new style
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if tag_name in ['b', 'strong', 'i', 'em', 'u', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
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# Push new font onto stack
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self._handle_tag(token, container)
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# Find the matching closing tag and parse content in between
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content_start = current_index + 1
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content_end = self._find_matching_closing_tag(tokens, current_index, tag_name)
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if content_end > content_start:
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# Parse content between opening and closing tags with current font style
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for j in range(content_start, content_end):
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content_token = tokens[j]
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if content_token['type'] == 'text':
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if content_token['content'].strip():
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text_obj = Text(content_token['content'].strip(), self.font_stack[-1])
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container.add_child(text_obj)
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elif content_token['type'] == 'tag' and not content_token['closing']:
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# Handle nested tags
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self._handle_tag(content_token, container)
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# Pop the font from stack
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if len(self.font_stack) > 1:
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self.font_stack.pop()
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return content_end + 1 if content_end < len(tokens) else len(tokens)
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else:
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# Handle other tags normally
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self._handle_tag(token, container)
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return current_index + 1
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def _find_matching_closing_tag(self, tokens, start_index, tag_name):
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"""Find the index of the matching closing tag"""
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open_count = 1
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i = start_index + 1
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while i < len(tokens) and open_count > 0:
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token = tokens[i]
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if token['type'] == 'tag' and token['name'] == tag_name:
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if token['closing']:
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open_count -= 1
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else:
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open_count += 1
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i += 1
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return i - 1 if open_count == 0 else len(tokens)
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def _tokenize_html(self, content: str) -> List[Dict]:
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"""Simple HTML tokenizer"""
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tokens = []
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tag_pattern = r'<(/?)([^>]+)>'
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last_end = 0
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for match in re.finditer(tag_pattern, content):
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# Add text before tag
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text_content = content[last_end:match.start()]
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if text_content:
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tokens.append({'type': 'text', 'content': text_content})
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# Add tag
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is_closing = bool(match.group(1))
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tag_content = match.group(2)
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tag_parts = tag_content.split()
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tag_name = tag_parts[0].lower()
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# Parse attributes
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attributes = {}
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if len(tag_parts) > 1:
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attr_text = ' '.join(tag_parts[1:])
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attr_pattern = r'(\w+)=(?:"([^"]*)"|\'([^\']*)\'|([^\s>]+))'
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for attr_match in re.finditer(attr_pattern, attr_text):
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attr_name = attr_match.group(1).lower()
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attr_value = attr_match.group(2) or attr_match.group(3) or attr_match.group(4)
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attributes[attr_name] = attr_value
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tokens.append({
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'type': 'tag',
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'name': tag_name,
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'closing': is_closing,
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'attributes': attributes,
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'content': tag_content
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})
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last_end = match.end()
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# Add remaining text
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if last_end < len(content):
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text_content = content[last_end:]
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if text_content:
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tokens.append({'type': 'text', 'content': text_content})
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return tokens
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def _handle_tag(self, token: Dict, container: Container):
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"""Handle HTML tags"""
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tag_name = token['name']
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is_closing = token['closing']
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attributes = token['attributes']
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if is_closing:
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# Handle closing tags
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if tag_name in ['b', 'strong']:
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self.font_stack.pop()
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elif tag_name in ['i', 'em']:
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self.font_stack.pop()
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elif tag_name == 'u':
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self.font_stack.pop()
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return
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# Handle opening tags
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if tag_name in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
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# Headers
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size_map = {'h1': 24, 'h2': 20, 'h3': 18, 'h4': 16, 'h5': 14, 'h6': 12}
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font = self.font_stack[-1].with_size(size_map[tag_name]).with_weight(FontWeight.BOLD)
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self.font_stack.append(font)
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elif tag_name in ['b', 'strong']:
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# Bold text
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font = self.font_stack[-1].with_weight(FontWeight.BOLD)
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self.font_stack.append(font)
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elif tag_name in ['i', 'em']:
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# Italic text
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font = self.font_stack[-1].with_style(FontStyle.ITALIC)
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self.font_stack.append(font)
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elif tag_name == 'u':
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# Underlined text
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font = self.font_stack[-1].with_decoration(TextDecoration.UNDERLINE)
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self.font_stack.append(font)
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elif tag_name == 'a':
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# Links
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href = attributes.get('href', '#')
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title = attributes.get('title', href)
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# Determine link type
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if href.startswith('http'):
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link_type = LinkType.EXTERNAL
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elif href.startswith('#'):
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link_type = LinkType.INTERNAL
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else:
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link_type = LinkType.INTERNAL
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# Create link callback
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def link_callback(location, **kwargs):
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return f"Navigate to: {location}"
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link = Link(href, link_type, link_callback, title=title)
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link_font = self.font_stack[-1].with_colour((0, 0, 255)).with_decoration(TextDecoration.UNDERLINE)
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# For now, just add the link text with link styling
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link_text = attributes.get('title', href)
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renderable_link = RenderableLink(link, link_text, link_font)
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container.add_child(renderable_link)
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elif tag_name == 'img':
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# Images
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src = attributes.get('src', '')
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alt = attributes.get('alt', 'Image')
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width = attributes.get('width')
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height = attributes.get('height')
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if src:
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# Resolve relative URLs
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if self.base_url and not src.startswith(('http://', 'https://')):
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if os.path.isdir(self.base_url):
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src = os.path.join(self.base_url, src)
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else:
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src = urljoin(self.base_url, src)
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try:
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# Create abstract image
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from pyWebLayout.abstract.block import Image as AbstractImage
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abstract_img = AbstractImage(src, alt)
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# Parse dimensions if provided
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max_width = int(width) if width and width.isdigit() else None
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max_height = int(height) if height and height.isdigit() else None
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renderable_img = RenderableImage(abstract_img, max_width, max_height)
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container.add_child(renderable_img)
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except Exception as e:
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# Add error text if image fails to load
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error_text = Text(f"[Image Error: {alt}]", Font(colour=(255, 0, 0)))
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container.add_child(error_text)
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elif tag_name == 'br':
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# Line breaks - add some vertical space
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spacer = Box((0, 0), (1, 10))
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container.add_child(spacer)
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elif tag_name == 'p':
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# Paragraphs - add some vertical space
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spacer = Box((0, 0), (1, 5))
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container.add_child(spacer)
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elif tag_name in ['div', 'span']:
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# Generic containers - just continue parsing
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pass
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class BrowserWindow:
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"""Main browser window using Tkinter"""
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def __init__(self):
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self.root = tk.Tk()
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self.root.title("pyWebLayout HTML Browser")
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self.root.geometry("900x700")
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self.current_page = None
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self.history = []
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self.history_index = -1
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self.setup_ui()
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def setup_ui(self):
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"""Setup the user interface"""
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# Create main frame
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main_frame = ttk.Frame(self.root)
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main_frame.pack(fill=tk.BOTH, expand=True, padx=5, pady=5)
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# Navigation frame
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nav_frame = ttk.Frame(main_frame)
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nav_frame.pack(fill=tk.X, pady=(0, 5))
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# Navigation buttons
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self.back_btn = ttk.Button(nav_frame, text="←", command=self.go_back, state=tk.DISABLED)
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self.back_btn.pack(side=tk.LEFT, padx=(0, 5))
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self.forward_btn = ttk.Button(nav_frame, text="→", command=self.go_forward, state=tk.DISABLED)
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self.forward_btn.pack(side=tk.LEFT, padx=(0, 5))
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self.refresh_btn = ttk.Button(nav_frame, text="⟳", command=self.refresh)
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self.refresh_btn.pack(side=tk.LEFT, padx=(0, 10))
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# Address bar
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ttk.Label(nav_frame, text="URL:").pack(side=tk.LEFT)
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self.url_var = tk.StringVar()
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self.url_entry = ttk.Entry(nav_frame, textvariable=self.url_var, width=50)
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self.url_entry.pack(side=tk.LEFT, fill=tk.X, expand=True, padx=(5, 5))
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self.url_entry.bind('<Return>', self.navigate_to_url)
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self.go_btn = ttk.Button(nav_frame, text="Go", command=self.navigate_to_url)
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self.go_btn.pack(side=tk.LEFT, padx=(0, 10))
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# File operations
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self.open_btn = ttk.Button(nav_frame, text="Open File", command=self.open_file)
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self.open_btn.pack(side=tk.LEFT)
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# Content frame with scrollbars
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content_frame = ttk.Frame(main_frame)
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content_frame.pack(fill=tk.BOTH, expand=True)
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# Create canvas with scrollbars
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self.canvas = tk.Canvas(content_frame, bg='white')
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v_scrollbar = ttk.Scrollbar(content_frame, orient=tk.VERTICAL, command=self.canvas.yview)
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h_scrollbar = ttk.Scrollbar(content_frame, orient=tk.HORIZONTAL, command=self.canvas.xview)
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self.canvas.configure(yscrollcommand=v_scrollbar.set, xscrollcommand=h_scrollbar.set)
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v_scrollbar.pack(side=tk.RIGHT, fill=tk.Y)
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h_scrollbar.pack(side=tk.BOTTOM, fill=tk.X)
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self.canvas.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
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# Status bar
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self.status_var = tk.StringVar(value="Ready")
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status_bar = ttk.Label(main_frame, textvariable=self.status_var, relief=tk.SUNKEN)
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status_bar.pack(fill=tk.X, pady=(5, 0))
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# Bind mouse events
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self.canvas.bind('<Button-1>', self.on_click)
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self.canvas.bind('<Motion>', self.on_mouse_move)
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# Load default page
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self.load_default_page()
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def load_default_page(self):
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"""Load a default welcome page"""
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html_content = """
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<html>
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<head><title>pyWebLayout Browser - Welcome</title></head>
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<body>
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<h1>Welcome to pyWebLayout Browser</h1>
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<p>This is a simple HTML browser built using pyWebLayout components.</p>
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<h2>Features:</h2>
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<ul>
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<li>Basic HTML rendering</li>
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<li>Text formatting (bold, italic, underline)</li>
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<li>Headers (H1-H6)</li>
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<li>Links (clickable)</li>
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<li>Images</li>
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<li>Forms (basic support)</li>
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</ul>
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<h2>Try these features:</h2>
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<p><b>Bold text</b>, <i>italic text</i>, and <u>underlined text</u></p>
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<p>Sample link: <a href="https://www.example.com" title="External link">Visit Example.com</a></p>
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<h3>File Operations</h3>
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<p>Use the "Open File" button to load local HTML files.</p>
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<p>Or enter a URL in the address bar above.</p>
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</body>
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</html>
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"""
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parser = HTMLParser()
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self.current_page = parser.parse_html_string(html_content)
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self.render_page()
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self.status_var.set("Welcome page loaded")
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def navigate_to_url(self, event=None):
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"""Navigate to the URL in the address bar"""
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url = self.url_var.get().strip()
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if not url:
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return
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self.status_var.set(f"Loading {url}...")
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self.root.update()
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try:
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if url.startswith(('http://', 'https://')):
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# Web URL
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response = requests.get(url, timeout=10)
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response.raise_for_status()
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html_content = response.text
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parser = HTMLParser()
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self.current_page = parser.parse_html_string(html_content, url)
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elif os.path.isfile(url):
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# Local file
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parser = HTMLParser()
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self.current_page = parser.parse_html_file(url)
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else:
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# Try to treat as a local file path
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if not url.startswith('file://'):
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url = 'file://' + os.path.abspath(url)
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file_path = url.replace('file://', '')
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if os.path.isfile(file_path):
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parser = HTMLParser()
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self.current_page = parser.parse_html_file(file_path)
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else:
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raise FileNotFoundError(f"File not found: {file_path}")
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# Add to history
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self.add_to_history(url)
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self.render_page()
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self.status_var.set(f"Loaded {url}")
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except Exception as e:
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self.status_var.set(f"Error loading {url}: {str(e)}")
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messagebox.showerror("Error", f"Failed to load {url}:\n{str(e)}")
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def open_file(self):
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"""Open a local HTML file"""
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file_path = filedialog.askopenfilename(
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title="Open HTML File",
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filetypes=[("HTML files", "*.html *.htm"), ("All files", "*.*")]
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)
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if file_path:
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self.url_var.set(file_path)
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|
self.navigate_to_url()
|
|
|
|
def render_page(self):
|
|
"""Render the current page to the canvas"""
|
|
if not self.current_page:
|
|
return
|
|
|
|
# Clear canvas
|
|
self.canvas.delete("all")
|
|
|
|
# Render the page to PIL Image
|
|
page_image = self.current_page.render()
|
|
|
|
# Convert to PhotoImage
|
|
self.photo = ImageTk.PhotoImage(page_image)
|
|
|
|
# Display on canvas
|
|
self.canvas.create_image(0, 0, anchor=tk.NW, image=self.photo)
|
|
|
|
# Update scroll region
|
|
self.canvas.configure(scrollregion=self.canvas.bbox("all"))
|
|
|
|
# Store page elements for interaction
|
|
self.page_elements = self._get_clickable_elements(self.current_page)
|
|
|
|
def _get_clickable_elements(self, container, offset=(0, 0)) -> List[Tuple]:
|
|
"""Get list of clickable elements with their positions"""
|
|
elements = []
|
|
|
|
if hasattr(container, '_children'):
|
|
for child in container._children:
|
|
if hasattr(child, '_origin'):
|
|
child_offset = (offset[0] + child._origin[0], offset[1] + child._origin[1])
|
|
|
|
# Check if element is clickable
|
|
if isinstance(child, (RenderableLink, RenderableButton)):
|
|
elements.append((child, child_offset, child._size))
|
|
|
|
# Recursively check children
|
|
if hasattr(child, '_children'):
|
|
elements.extend(self._get_clickable_elements(child, child_offset))
|
|
|
|
return elements
|
|
|
|
def on_click(self, event):
|
|
"""Handle mouse clicks on the canvas"""
|
|
# Convert canvas coordinates to image coordinates
|
|
canvas_x = self.canvas.canvasx(event.x)
|
|
canvas_y = self.canvas.canvasy(event.y)
|
|
|
|
# Check if click is on any clickable element
|
|
for element, offset, size in self.page_elements:
|
|
element_x, element_y = offset
|
|
element_w, element_h = size
|
|
|
|
if (element_x <= canvas_x <= element_x + element_w and
|
|
element_y <= canvas_y <= element_y + element_h):
|
|
|
|
# Handle the click
|
|
if isinstance(element, RenderableLink):
|
|
result = element._callback()
|
|
if result:
|
|
self.status_var.set(result)
|
|
# For external links, open in system browser
|
|
if element._link.link_type == LinkType.EXTERNAL:
|
|
webbrowser.open(element._link.location)
|
|
|
|
elif isinstance(element, RenderableButton):
|
|
result = element._callback()
|
|
if result:
|
|
self.status_var.set(f"Button clicked: {result}")
|
|
|
|
break
|
|
|
|
def on_mouse_move(self, event):
|
|
"""Handle mouse movement for hover effects"""
|
|
# Convert canvas coordinates to image coordinates
|
|
canvas_x = self.canvas.canvasx(event.x)
|
|
canvas_y = self.canvas.canvasy(event.y)
|
|
|
|
# Check if mouse is over any clickable element
|
|
cursor = "arrow"
|
|
for element, offset, size in self.page_elements:
|
|
element_x, element_y = offset
|
|
element_w, element_h = size
|
|
|
|
if (element_x <= canvas_x <= element_x + element_w and
|
|
element_y <= canvas_y <= element_y + element_h):
|
|
cursor = "hand2"
|
|
break
|
|
|
|
self.canvas.configure(cursor=cursor)
|
|
|
|
def add_to_history(self, url):
|
|
"""Add URL to navigation history"""
|
|
# Remove any forward history
|
|
self.history = self.history[:self.history_index + 1]
|
|
|
|
# Add new URL
|
|
self.history.append(url)
|
|
self.history_index = len(self.history) - 1
|
|
|
|
# Update navigation buttons
|
|
self.update_nav_buttons()
|
|
|
|
def update_nav_buttons(self):
|
|
"""Update the state of navigation buttons"""
|
|
self.back_btn.configure(state=tk.NORMAL if self.history_index > 0 else tk.DISABLED)
|
|
self.forward_btn.configure(state=tk.NORMAL if self.history_index < len(self.history) - 1 else tk.DISABLED)
|
|
|
|
def go_back(self):
|
|
"""Navigate back in history"""
|
|
if self.history_index > 0:
|
|
self.history_index -= 1
|
|
url = self.history[self.history_index]
|
|
self.url_var.set(url)
|
|
self.navigate_to_url()
|
|
|
|
def go_forward(self):
|
|
"""Navigate forward in history"""
|
|
if self.history_index < len(self.history) - 1:
|
|
self.history_index += 1
|
|
url = self.history[self.history_index]
|
|
self.url_var.set(url)
|
|
self.navigate_to_url()
|
|
|
|
def refresh(self):
|
|
"""Refresh the current page"""
|
|
if self.current_page:
|
|
current_url = self.url_var.get()
|
|
if current_url:
|
|
self.navigate_to_url()
|
|
else:
|
|
self.load_default_page()
|
|
|
|
def run(self):
|
|
"""Start the browser"""
|
|
self.root.mainloop()
|
|
|
|
|
|
def main():
|
|
"""Main function to run the browser"""
|
|
print("Starting pyWebLayout HTML Browser...")
|
|
|
|
try:
|
|
browser = BrowserWindow()
|
|
browser.run()
|
|
except Exception as e:
|
|
print(f"Error starting browser: {e}")
|
|
import traceback
|
|
traceback.print_exc()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|