From: mar77i <mar77i@protonmail.ch>
Date: Tue, 18 Mar 2025 16:29:35 +0000 (+0100)
Subject: fix md renderer. add basic css
X-Git-Url: https://git.mar77i.info/?a=commitdiff_plain;h=3d245af449c4f3263d06a28da4c63cd54ab195b9;p=mar77i.info

fix md renderer. add basic css
---

diff --git a/generate.py b/generate.py
index 89e50ff..53301ab 100755
--- a/generate.py
+++ b/generate.py
@@ -45,6 +45,7 @@ def main():
     blog_path.mkdir(0o755)
     context["title"], context["page"] = "Blog stub", "<h2>Blog stub</h2>"
     write_content(blog_path / "index.html", template.format(**context))
+    write_content(output_path / "style.css", get_content(source_path / "style.css"))
 
 
 if __name__ == "__main__":
diff --git a/md.py b/md.py
index c188701..cd45a2b 100644
--- a/md.py
+++ b/md.py
@@ -1,64 +1,153 @@
-from collections import OrderedDict
-from html import escape
+import os
 from io import StringIO
 
 
+class MDTag:
+    registered_tags = []
+    char: str
+    tag_name: str
+
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__(**kwargs)
+        MDTag.registered_tags.append(cls)
+
+    def __init__(self, states, sio):
+        self.states = states
+        self.sio = sio
+        states.append(self)
+        self.start = sio.tell()
+
+    def write(self, c):
+        if c == self.char:
+            c = self.end()
+        self.sio.write(c)
+
+    def end(self):
+        self.states.pop()
+        return f"<{self.tag_name}>{self.cut()}</{self.tag_name}>"
+
+    def cut(self):
+        self.sio.seek(self.start)
+        value = self.sio.read()
+        self.sio.seek(self.start)
+        self.sio.truncate()
+        return value
+
+
+class Bold(MDTag):
+    char = "*"
+    tag_name = "b"
+
+
+class Italic(MDTag):
+    char = "/"
+    tag_name = "i"
+
+
+class Underline(MDTag):
+    char = "_"
+    tag_name = "u"
+
+
+class Code(MDTag):
+    char = "`"
+    tag_name = "code"
+
+
+class Link(MDTag):
+    char = "["
+    tag_name = "a"
+    start: int | None
+
+    def __init__(self, states, sio):
+        super().__init__(states, sio)
+        self.text = None
+
+    def write(self, c):
+        if self.text is None:
+            if c != "]":
+                self.sio.write(c)
+                return
+            self.text = self.cut()
+            self.start = None
+            return
+        elif self.start is None:
+            if c != "(":
+                raise ValueError("Expected '('")
+            self.start = self.sio.tell()
+            return
+        elif c != ")":
+            self.sio.write(c)
+            return
+        self.sio.write(f'<a href="{self.cut()}">{self.text}</a>')
+        self.states.pop()
+
+
 class Paragraph:
     name = "p"
 
     def __init__(self):
         self.lines = []
-        self.attributes = OrderedDict()
-
-    def join_attrs(self):
-        if not self.attributes:
-            return ""
-        return "".join(
-            f' {key}="{escape(value)}"' for key, value in self.attributes.items()
-        )
-
-    def add_link(self, sio, link):
-        sio.seek(link[0])
-        text = sio.read(link[1] - link[0])
-        url = sio.read()
-        sio.seek(link[0])
-        sio.truncate()
-        sio.write('<a href="')
-        sio.write(escape(url.strip()))
-        sio.write('">')
-        sio.write(escape(text, False))
-        sio.write("</a>")
-        return None
+        self.content = ""
+        self.sio = StringIO()
+        self.end_backslash = None
+        self.backslash = False
+        self.states = []
+
+    def check_states(self, tag_class):
+        if len(self.states) == 0:
+            return True
+        if isinstance(self.states[-1], tag_class):
+            return False
+        links = [state for state in self.states if isinstance(state, Link)]
+        if len(links) > 0:
+            return links[-1].text is None or links[-1].start is None
+        return True
+
+    def handle_backslash(self, i, c):
+        if i == self.end_backslash:
+            self.end_backslash = None
+            self.backslash = False
+            return False
+        elif self.end_backslash is not None:
+            pass
+        elif self.content[i:i + len(os.linesep)] == os.linesep:
+            self.sio.write(" ")
+            self.end_backslash = i + len(os.linesep)
+        else:
+            self.sio.write(c)
+            self.backslash = False
+        return True
 
     def join_lines(self):
-        content = '\n'.join(self.lines)
-        sio = StringIO()
-        backslash = False
-        link = None
-        for i, c in enumerate(content):
-            if backslash:
-                assert c in "\\()[]`*/_\n"
-                if c == "\n":
-                    c = " "
-                sio.write(c)
-            elif link is not None:
-                if c == "[]()"[len(link)]:
-                    link.append(sio.tell())
-                    if len(link) == 4:
-                        link = self.add_link(sio, link)
-                    continue
+        if self.sio.getvalue():
+            assert not self.lines
+            return self.sio.getvalue()
+        self.content = os.linesep.join(self.lines)
+        for i, c in enumerate(self.content):
+            if self.backslash and self.handle_backslash(i, c):
+                continue
             if c == "\\":
-                backslash = True
+                self.backslash = True
                 continue
-            elif c == "[":
-                link = [sio.tell()]
+            tag = None
+            for tag_class in MDTag.registered_tags:
+                if c == tag_class.char and self.check_states(tag_class):
+                    tag = tag_class(self.states, self.sio)
+                    break
+            if tag is not None:
                 continue
-            sio.write(c)
-        assert backslash is False and link is None
-        return sio.getvalue()
+            if len(self.states) > 0:
+                self.states[-1].write(c)
+            else:
+                self.sio.write(c)
+        assert len(self.states) == 0, self.states
+        assert not self.backslash
+        self.lines.clear()
+        return self.sio.getvalue()
 
     def join(self):
-        return f"<{self.name}{self.join_attrs()}>{self.join_lines()}</{self.name}>"
+        return f"<{self.name}>{self.join_lines()}</{self.name}>"
 
 
 class Heading2(Paragraph):
@@ -84,62 +173,48 @@ class BulletList(Paragraph):
         self.list_items.append(self.ListItem())
 
     def join_lines(self):
-        return "\n".join(li.join() for li in self.list_items)
+        return os.linesep.join(li.join() for li in self.list_items)
 
 
 class MDRenderer:
     """
     Simplified markdown to html translator.
     """
-    METACHARS = "\\[*/_~`"
-    INLINE_TAGS = {
-        "*": "b",
-        "/": "i",
-        "_": "u",
-        "~": "del",
-        "`": "code",
-    }
-
     def __init__(self, page):
         self.page = page
-        self.tag = None
         self.sio = StringIO()
+        self.tag = None
+        self.tags = []
+
+    def set_tag(self, tag_class):
+        if isinstance(self.tag, tag_class):
+            return False
+        self.tag = tag_class()
+        self.tags.append(self.tag)
+        return True
 
     def render_html(self):
-        # let's initially support #/<h2>, <p>, and single level lists <ul><li>
-        # where two spaces after a bullet line continues the list item.
-        # backslash escapes transform newlines to spaces in the output
-        # inline tags are evaluated when a tag is closed,
-        # and the in-between text is then html escaped
-        #
-        # return title, html
-        tags = []
-        tag = None
         title = None
-        for line in self.page.split("\n"):
+        for line in self.page.split(os.linesep):
             if line.startswith("# "):
-                if not isinstance(tag, Heading2):
-                    tag = Heading2()
-                    if title is None:
-                        title = tag
-                    tags.append(tag)
+                self.set_tag(Heading2)
+                if title is None:
+                    title = self.tag
                 line = line[2:]
             elif line.startswith("- "):
-                if not isinstance(tag, BulletList):
-                    tag = BulletList()
-                    tags.append(tag)
-                else:
-                    tag.lines = []
+                if not self.set_tag(BulletList):
+                    self.tag.lines = None
                 line = line[2:]
             elif line.startswith("  "):
-                assert isinstance(tag, BulletList)
+                assert isinstance(self.tag, BulletList)
                 line = line[2:]
             elif line == "":
-                tag = None
+                self.tag = None
                 continue
             else:
-                if not isinstance(tag, Paragraph):
-                    tag = Paragraph()
-                    tags.append(tag)
-            tag.lines.append(line)
-        return title.join_lines() if title else None, "\n".join(t.join() for t in tags)
+                self.set_tag(Paragraph)
+            self.tag.lines.append(line)
+        return (
+            title.join_lines() if title else None,
+            os.linesep.join(t.join() for t in self.tags),
+        )
diff --git a/style.css b/style.css
index e69de29..772cc91 100644
--- a/style.css
+++ b/style.css
@@ -0,0 +1,17 @@
+html {
+    min-height: 100%;
+}
+
+body {
+    background-color: black;
+    background: linear-gradient(to bottom right, #000000 66%, #808000 100%);
+    color: lightgray;
+}
+
+a:link {
+    color: mediumturquoise;
+}
+
+a:visited {
+    color: mediumorchid;
+}