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from panflute import *
import re
# Import local files
from whitespace import *
from command import *
from util import *
from context import *
def transform(e: Element, c: Context) -> Element: # Returns next sibling element to transform
"""Transform the AST, making format-agnostic changes."""
if isinstance(e, Whitespace) and bavlna(e, c):
e = NBSP()
if hasattr(e, "attributes"):
# `if` attribute. Only show this element if flag is set.
if "if" in e.attributes:
if not c.is_flag_set(e.attributes["if"]):
return nullify(e)
# `ifn` attribute. Only show this element if flag is NOT set
if "ifn" in e.attributes:
if c.is_flag_set(e.attributes["ifn"]):
return nullify(e)
# `c` attribute. Execute a command with the name saved in this attribute.
if (isinstance(e, Div) or isinstance(e, Span)) and "c" in e.attributes:
if isinstance(e, Div):
e = BlockCommand(*e.content, identifier=e.identifier, classes=e.classes, attributes=e.attributes)
else:
e = InlineCommand(*e.content, identifier=e.identifier, classes=e.classes, attributes=e.attributes)
# `partial` attribute.
# This is for including content from files with their own flags and
# commands without affecting the state of the current document.
if (isinstance(e, Div)) and "partial" in e.attributes:
includedDoc = import_md(open(e.attributes["partial"], "r").read())
nContext = Context(includedDoc, c)
includedDoc = includedDoc.walk(transform, nContext)
e = Div(*includedDoc.content)
# Execute python code inside source code block
if isinstance(e, CodeBlock) and hasattr(e, "classes") and "python" in e.classes and "run" in e.classes:
e = executeCommand(e.text, None, c)
## Command defines
# possible TODO: def/longdef?
if isinstance(e, CodeBlock) and hasattr(e, "classes") and "python" in e.classes and hasattr(e, "attributes"):
e = handle_command_define(e, c)
## Shorthands
if isinstance(e, Span) and len(e.content) == 1 and isinstance(e.content[0], Str):
## Handle special command shorthand [!commandname]{}
if re.match(r"^![\w.]+$", e.content[0].text):
e = InlineCommand(identifier=e.identifier, classes=e.classes, attributes={**e.attributes, "c": e.content[0].text[1:]})
## Handle import [#path/file.md]{}
# This is the exact opposite of include. We take the commands
# and flags but drop the content.
elif re.match(r"^#.+$", e.content[0].text):
importedDoc = import_md(open(e.content[0].text[1:], "r").read())
importedDoc.walk(transform, c)
return nullify(e)
## Execute commands
# panflute's walk transforms the children first, then the root element, so
# the content of the element the command receives is already transformed.
if isinstance(e, Command):
if not c.get_command(e.attributes["c"]):
raise NameError(f"Command not defined '{e.attributes['c']}'.")
e = e.replaceSelf(executeCommand(c.get_command(e.attributes["c"]), e, c))
e.walk(transform, c)
return e