print(pe)
else:
if fn != None:
print(fn( bnf.parseString( strg ) ))
else:
print()
digits = "0123456789"
# Version 1
element = Regex("A[cglmrstu]|B[aehikr]?|C[adeflmorsu]?|D[bsy]|"
"E[rsu]|F[emr]?|G[ade]|H[efgos]?|I[nr]?|Kr?|L[airu]|"
"M[dgnot]|N[abdeiop]?|Os?|P[abdmortu]?|R[abefghnu]|"
"S[bcegimnr]?|T[abcehilm]|U(u[bhopqst])?|V|W|Xe|Yb?|Z[nr]")
element = Word( alphas.upper(), alphas.lower(), max=2)
elementRef = Group( element + Optional( Word( digits ), default="1" ) )
formula = OneOrMore( elementRef )
fn = lambda elemList : sum( [ atomicWeight[elem]*int(qty) for elem,qty in elemList ] )
test( formula, "H2O", fn )
test( formula, "C6H5OH", fn )
test( formula, "NaCl", fn )
print()
# Version 2 - access parsed items by field name
elementRef = Group( element("symbol") + Optional( Word( digits ), default="1" )("qty") )
formula = OneOrMore( elementRef )
fn = lambda elemList : sum( [ atomicWeight[elem.symbol]*int(elem.qty) for elem in elemList ] )
test( formula, "H2O", fn )
delimitedList
# http://www.antlr.org/grammar/ANTLR/ANTLRv3.g
# Tokens
EOL = Suppress(LineEnd()) # $
singleTextString = originalTextFor(ZeroOrMore(~EOL + (White(" \t") | Word(printables)))).leaveWhitespace()
XDIGIT = hexnums
INT = Word(nums)
ESC = Literal('\\') + (oneOf(list(r'nrtbf\">'+"'")) | ('u' + Word(hexnums, exact=4)) | Word(printables, exact=1))
LITERAL_CHAR = ESC | ~(Literal("'") | Literal('\\')) + Word(printables, exact=1)
CHAR_LITERAL = Suppress("'") + LITERAL_CHAR + Suppress("'")
STRING_LITERAL = Suppress("'") + Combine(OneOrMore(LITERAL_CHAR)) + Suppress("'")
DOUBLE_QUOTE_STRING_LITERAL = '"' + ZeroOrMore(LITERAL_CHAR) + '"'
DOUBLE_ANGLE_STRING_LITERAL = '<<' + ZeroOrMore(Word(printables, exact=1)) + '>>'
TOKEN_REF = Word(alphas.upper(), alphanums+'_')
RULE_REF = Word(alphas.lower(), alphanums+'_')
ACTION_ESC = (Suppress("\\") + Suppress("'")) | Suppress('\\"') | Suppress('\\') + (~(Literal("'") | Literal('"')) + Word(printables, exact=1))
ACTION_CHAR_LITERAL = Suppress("'") + (ACTION_ESC | ~(Literal('\\') | Literal("'")) + Word(printables, exact=1)) + Suppress("'")
ACTION_STRING_LITERAL = Suppress('"') + ZeroOrMore(ACTION_ESC | ~(Literal('\\') | Literal('"')) + Word(printables, exact=1)) + Suppress('"')
SRC = Suppress('src') + ACTION_STRING_LITERAL("file") + INT("line")
id = TOKEN_REF | RULE_REF
SL_COMMENT = Suppress('//') + Suppress('$ANTLR') + SRC | ZeroOrMore(~EOL + Word(printables)) + EOL
ML_COMMENT = cStyleComment
WS = OneOrMore(Suppress(' ') | Suppress('\t') | (Optional(Suppress('\r')) + Literal('\n')))
WS_LOOP = ZeroOrMore(SL_COMMENT | ML_COMMENT)
NESTED_ARG_ACTION = Forward()
NESTED_ARG_ACTION << Suppress('[') + ZeroOrMore(NESTED_ARG_ACTION | ACTION_STRING_LITERAL | ACTION_CHAR_LITERAL) + Suppress(']')
ARG_ACTION = NESTED_ARG_ACTION
NESTED_ACTION = Forward()
NESTED_ACTION << Suppress('{') + ZeroOrMore(NESTED_ACTION | SL_COMMENT | ML_COMMENT | ACTION_STRING_LITERAL | ACTION_CHAR_LITERAL) + Suppress('}')
print(fn(bnf.parseString(strg)))
else:
print()
digits = "0123456789"
# Version 1
element = Regex(
"A[cglmrstu]|B[aehikr]?|C[adeflmorsu]?|D[bsy]|"
"E[rsu]|F[emr]?|G[ade]|H[efgos]?|I[nr]?|Kr?|L[airu]|"
"M[dgnot]|N[abdeiop]?|Os?|P[abdmortu]?|R[abefghnu]|"
"S[bcegimnr]?|T[abcehilm]|U(u[bhopqst])?|V|W|Xe|Yb?|Z[nr]"
)
element = Word(alphas.upper(), alphas.lower(), max=2)
elementRef = Group(element + Optional(Word(digits), default="1"))
formula = OneOrMore(elementRef)
fn = lambda elemList: sum([atomicWeight[elem] * int(qty) for elem, qty in elemList])
test(formula, "H2O", fn)
test(formula, "C6H5OH", fn)
test(formula, "NaCl", fn)
print()
# Version 2 - access parsed items by field name
elementRef = Group(element("symbol") + Optional(Word(digits), default="1")("qty"))
formula = OneOrMore(elementRef)
fn = lambda elemList: sum([atomicWeight[elem.symbol] * int(elem.qty) for elem in elemList])
test(formula, "H2O", fn)