Added skeleton of html2ast.py.

This is to test code for converting HTML into the representation of
the AST returned by cmark_render_ast.  Eventually this will be
used instead of HTML in the tests.

1 files changed, 84 insertions, 0 deletions

diff --git a/html2ast.py b/html2ast.py
new file mode 100644
index 0000000..9d23e87
--- /dev/null
+++ b/html2ast.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import sys
+from HTMLParser import HTMLParser, HTMLParseError
+import re
+from htmlentitydefs import name2codepoint
+import cgi
+
+class MyHTMLParser(HTMLParser):
+    def __init__(self):
+        HTMLParser.__init__(self)
+        self.in_pre = False
+        self.output = u""
+    def handle_data(self, data):
+        self.output += data
+    def handle_endtag(self, tag):
+        if tag == "pre":
+            self.in_pre = False
+    def handle_starttag(self, tag, attrs):
+        if tag == "pre":
+            self.in_pre = True
+    def handle_startendtag(self, tag, attrs):
+        self.output += ""
+    def handle_comment(self, data):
+        self.output += '<!--' + data + '-->'
+    def handle_decl(self, data):
+        self.output += '<!' + data + '>'
+    def unknown_decl(self, data):
+        self.output += '<!' + data + '>'
+    def handle_pi(self,data):
+        self.output += '<?' + data + '>'
+    def handle_entityref(self, name):
+        try:
+            c = unichr(name2codepoint[name])
+        except KeyError:
+            c = None
+        self.output_char(c)
+    def handle_charref(self, name):
+        try:
+            if name.startswith("x"):
+                c = unichr(int(name[1:], 16))
+            else:
+                c = unichr(int(name))
+        except ValueError:
+                c = None
+        self.output_char(c)
+    # Helpers.
+    def output_char(self, c):
+        if c == u'\n':
+            self.output += "\\n"
+        elif c == u'"':
+            self.output += "\\\""
+        elif c == u'\\':
+            self.output += "\\\\"
+        else:
+            self.output += c
+
+    def is_block_tag(self,tag):
+        return (tag in ['article', 'header', 'aside', 'hgroup', 'blockquote',
+            'hr', 'iframe', 'body', 'li', 'map', 'button', 'object', 'canvas',
+            'ol', 'caption', 'output', 'col', 'p', 'colgroup', 'pre', 'dd',
+            'progress', 'div', 'section', 'dl', 'table', 'td', 'dt',
+            'tbody', 'embed', 'textarea', 'fieldset', 'tfoot', 'figcaption',
+            'th', 'figure', 'thead', 'footer', 'tr', 'form', 'ul',
+            'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'video', 'script', 'style'])
+
+def html2ast(html):
+    html_chunk_re = re.compile("(\<!\[CDATA\[.*?\]\]\>|\<[^>]*\>|[^<]+)")
+    parser = MyHTMLParser()
+    # We work around HTMLParser's limitations parsing CDATA
+    # by breaking the input into chunks and passing CDATA chunks
+    # through verbatim.
+    for chunk in re.finditer(html_chunk_re, html):
+        if chunk.group(0)[:8] == "<![CDATA":
+            parser.output += chunk.group(0)
+        else:
+            parser.feed(chunk.group(0).decode(encoding='UTF-8'))
+    parser.close()
+    return parser.output
+
+
+if __name__ == "__main__":
+    print(html2ast(sys.stdin.read()))