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from lark import Lark, Transformer, Token, Tree
from script_format import ScriptFormat
class LdrXfrm(Transformer):
""" transform the parse tree into a more easily consumable form """
def rst(self, items):
return ('reset')
def NONL(self, items):
return ''.join([i for i in items.value])
def rem(self, items):
return ('rem', items[0])
def swmatch(self, items):
return ('swmatch', items)
def cmd(self, items):
return ('cmd', {'req': items[0], 'rsp': items[1]})
def todigit(self, item):
""" convert from Token/Tree to raw hex-digit """
if isinstance(item, Token):
return item.value
elif isinstance(item, Tree):
return item.data
def hex_item(self, items):
""" return one byte as two-digit HEX string """
return "%s%s" % (items[0].value, items[1].value)
def hexstr(self, items):
""" return list of two-digit HEX strings """
return ('hexstr', ''.join(list(items)))
def swpattern(self, items):
""" return list of four HEX nibbles (or 'x' as wildcard) """
arr = [self.todigit(x) for x in items]
return ''.join(arr)
class ScriptFormatLDR(ScriptFormat):
# parser for the LDR file format as generated by Simulity Profile Editor
ldr_parser = Lark(r"""
script: statement*
?statement: cmd | rst | rem | NEWLINE
BSLASH: "\\\n"
%ignore BSLASH
NONL: /[^\n]/+
rem: "REM" NONL? NEWLINE
ALNUM: DIGIT | LETTER | "_"
key: "[" ALNUM+ "]"
cmd: "CMD" hexstr [swmatch] NEWLINE
cmd_item: hexstr | key
hexstr: hex_item+
hex_item: HEXDIGIT HEXDIGIT
swmatch: "(" swpattern ("," swpattern)* ")"
swpattern: hex_or_x hex_or_x hex_or_x hex_or_x
?hex_or_x: HEXDIGIT | "X" -> x | "x" -> x
rst: "RST" NEWLINE
%import common.ESCAPED_STRING -> STRING
%import common.WS_INLINE
%import common.HEXDIGIT
%import common.DIGIT
%import common.LETTER
%import common.NEWLINE
%ignore WS_INLINE
""", start='script')
def parse_xform(self, text):
tree = self.ldr_parser.parse(text)
#print(tree.pretty())
p = LdrXfrm().transform(tree)
return p
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