else:
from .RailroadDiagrams import NonTerminal, Terminal, Choice, HorizontalChoice, Sequence, Diagram, show_diagram
if __name__ == "__main__":
from IPython.display import SVG, display
def syntax_diagram_symbol(symbol):
if is_nonterminal(symbol):
return NonTerminal(symbol[1:-1])
else:
return Terminal(symbol)
if __name__ == "__main__":
SVG(show_diagram(syntax_diagram_symbol('<term>')))
def syntax_diagram_expr(expansion):
# In later chapters, we allow expansions to be tuples,
# with the expansion being the first element
if isinstance(expansion, tuple):
expansion = expansion[0]
symbols = [sym for sym in re.split(RE_NONTERMINAL, expansion) if sym != ""]
if len(symbols) == 0:
symbols = [""] # special case: empty expansion
return Sequence(*[syntax_diagram_symbol(sym) for sym in symbols])
def syntax_diagram(grammar):
from IPython.display import SVG, display
for key in grammar:
print("%s" % key[1:-1])
display(SVG(show_diagram(syntax_diagram_alt(grammar[key]))))
def syntax_diagram(grammar):
for key in grammar:
print("%s" % key[1:-1])
display(SVG(show_diagram(syntax_diagram_alt(grammar[key]))))