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author | Trygve Laugstøl <trygvis@inamo.no> | 2017-12-07 23:48:02 +0100 |
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committer | Trygve Laugstøl <trygvis@inamo.no> | 2017-12-07 23:48:02 +0100 |
commit | efe5d835eaa26d8696c3352c4e1ed42da16fe27b (patch) | |
tree | d91a0273618e274278da77d01a20c183320f0940 /src/ee/kicad/sexpr | |
parent | 1fba999bec5a589e4785594fb1a6fbfab9129097 (diff) | |
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Diffstat (limited to 'src/ee/kicad/sexpr')
-rw-r--r-- | src/ee/kicad/sexpr/__init__.py | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/ee/kicad/sexpr/__init__.py b/src/ee/kicad/sexpr/__init__.py new file mode 100644 index 0000000..a8604dc --- /dev/null +++ b/src/ee/kicad/sexpr/__init__.py @@ -0,0 +1,123 @@ +EVENT_START = 1 +EVENT_END = 2 +EVENT_LPAREN = 3 +EVENT_RPAREN = 4 +EVENT_TEXT = 5 + +def state_to_str(s): + if s == EVENT_START: + return "EVENT_START" + if s == EVENT_END: + return "EVENT_END" + if s == EVENT_LPAREN: + return "EVENT_LPAREN" + if s == EVENT_RPAREN: + return "EVENT_RPAREN" + if s == EVENT_TEXT: + return "EVENT_TEXT" + return "UNKNOWN STATE" + +def logging_parser(parser): + for (event, token) in parser: + if token: + print("SEXPR: event={}, token={}".format(state_to_str(event), token or "")) + else: + print("SEXPR: event={}".format(state_to_str(event))) + yield (event, token) + +def parse(path): + class state(object): + def __init__(self): + self.f = open(path, "r")#, 128 * 1024) + self.state = EVENT_START + self.buffer = [] + + def text(self): + return self._text + + def close(self): + if self.f: + f = self.f + self.f = None + f.close() + + def _read_c(self): + # TODO: count lines and characters + if self.buffer: + c = self.buffer[0] + del self.buffer[0] + return c + + c = self.f.read(1) + while c and c == '\n': + c = self.f.read(1) + return c + + def _unread(self, s): + for c in s: + self.buffer.append(c) + + def _read_token(self): + s = "" + while True: + c = self._read_c() + + if not c: + return s if s else None + + if c == " ": + # Ignore leading blanks + if not s: + continue + + if c == "(" or c == ")": + if not s: + return c + self._unread(c) + return s.rstrip() + + if c == " ": + return s + + if c == "\"": + while c: + c = self._read_c() + + if c == "\"": + break + + s += c + return s + s += c + + return s.rstrip() + + def next(self): + s = self.state + self._text = None + if s == EVENT_END: + raise Exception("Invalid state, state=END") + + token = self._read_token() + + if token is None: + self.state = EVENT_END + self.close() + return (EVENT_END, None) + + if token == "(": + self.state = EVENT_LPAREN + return (EVENT_LPAREN, None) + if token == ")": + self.state = EVENT_RPAREN + return (EVENT_RPAREN, None) + + self._text = token + self.state = EVENT_TEXT + return (EVENT_TEXT, token) + + s = state() + (event, token) = s.next() + while event != EVENT_END: + yield (event, token) + (event, token) = s.next() |