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