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css_parser.py
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css_parser.py
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from tinycss.css21 import CSS21Parser
import cssselect
import sys
css = open(sys.argv[-1],'r').read()
styles = CSS21Parser().parse_stylesheet(css)
for ruleIdx in range(len(styles.rules)):
rule = styles.rules[ruleIdx]
selectors = rule.selector
selector_string = selectors.as_css()
specs = [s.specificity() for s in cssselect.parse(selector_string)]
for i in range(len(specs)):
spec = specs[i][0] * 100 + specs[i][1] * 10 + specs[i][2]
spec = spec * 1000 + ruleIdx
specs[i] = spec
for decl in rule.declarations:
if len(decl.value) == 1:
decl_value = "'" + str(decl.value[0].value) + "'"
else:
decl_value = '[' + ','.join(["'"+str(x.value)+"'" for x in decl.value if x.type != 'S']) + ']'
# A0,...,A(N-1) each selector
# AN final node
N = len(selectors)
specIdx = 0
print "rule(A%d,'%s',%s,%d):-" % (N,decl.name,decl_value,specs[specIdx])
for i in range(N):
selector_value = selectors[i].value
#property(id,tag,class,name,value)
#take care of percentage value
#take care of value with special symbols
# "A B" -> ancestor(A,B)
if selectors[i].type == 'S':
if selectors[i-1].value != ',':
print " ancestor(A%d,A%d)," % (i-1,i+1)
# A,... -> A = AN;...
elif selector_value == ',':
print " A%d = A%d." % (i-1,N)
specIdx += 1
print "rule(A%d,'%s',%s,%d):-" % (N,decl.name,decl_value,specs[specIdx])
elif selector_value == '.':
if i > 0:
if selectors[i-1].type == 'IDENT':
# # A.B -> A = B
print " A%d = A%d," % (i-1,i+1)
else:
# # A .B -> . = B
print " A%d = A%d," % (i,i+1)
elif selector_value[0] == '#':
selector_value = selector_value[1:]
if i > 0 and selectors[i-1].type == 'IDENT':
print " A%d = A%d," % (i-1,i)
print " property(A%d,'id','%s')," % (i,selector_value)
else:
if i > 0 and selectors[i-1].value == '.':
print " property(A%d,'class','%s')," % (i,selector_value)
else:
print " property(A%d,'tag','%s')," % (i,selector_value)
if i == N-1:
print " A%d = A%d." % (i,N)