Am Sonntag, 10. Februar 2013, 20:48:29 schrieb Alan Manuel Gloria: > Attached find a simple implementation (which does *not* handle > comments, blank lines, and ":").
Wow, that’s cool! The only parsing issue I spotted right away is that it appends a final opening bracket. I tried writing a python-based preprocessor, but that one uses multiple phases for preprocessing, since I always fumbled when I tried to wrap my mind around parsing indentation without aid… Best wishes, Arne -- 1w6 sie zu achten, sie alle zu finden, in Spiele zu leiten und sacht zu verbinden. → http://1w6.org
#!/usr/bin/env python3
class Line:
def __init__(self, line):
self.continues = line.lstrip().startswith(". ")
if self.continues:
self.content = line.lstrip()[2:].lstrip()
else:
self.content = line.lstrip()
self.indent = len(line) - len(line.lstrip())
while self.content.startswith(": ") and self.content[2:].lstrip():
self.indent += len(self.content) - len(self.content[2:].lstrip())
self.content = self.content[2:].lstrip()
if self.content.strip() == ":":
self.content = ""
def wisp2lisp(code):
"""Turn wisp code to lisp code."""
# first get rid of linebreaks in strings
instring = False
nostringbreaks = []
for char in code:
if char == '"':
instring = not instring
if instring and char == "\n":
nostringbreaks.append("\\n")
else:
nostringbreaks.append(char)
code = "".join(nostringbreaks)
# now read the indentation
lines = []
for line in code.splitlines():
lines.append(Line(line))
# finally emit matching lisp code
# write into the lisp lines with a delay of 1 line
lisplines = []
levels = []
prev = lines[0]
if not prev.continues:
prev.content = "(" + prev.content
for line in lines[1:]:
# continuing lines do not get a leading bracket.
if not line.continues:
line.content = "(" + line.content
# rising indent: sibling function or variable
if line.indent > prev.indent:
levels.append(line.indent)
lisplines.append(prev.indent * " " + prev.content)
# same indent: neighbour function of variable: close the previour lines bracket
if line.indent == prev.indent:
lisplines.append(prev.indent * " " + prev.content + ")")
# lower indent: parent funtion or variable. Find the number of brackets to close
if prev.indent > line.indent:
bracketstoclose = len([level for level in levels if level >= line.indent])
levels = levels[:-bracketstoclose + 1]
if prev.continues:
bracketstoclose -= 1
lisplines.append(prev.indent * " " + prev.content + ")" * bracketstoclose)
prev = line
lisplines.append(prev.indent * " " + prev.content + ")" * (len(levels)))
return "\n".join(lisplines)
if __name__ == "__main__":
print()
with open("example.w") as f:
wisp = f.read()
print(wisp2lisp(wisp))
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