Sha256: 0326099ca679a0fdc2677d1ea39d2ecf4567cbe801751d3e7e26257cebd82e2a
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Versions: 13
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Contents
grammar Calc
# If "additive" were not already the first rule declared in this grammar, we
# could use the following line to make it the root rule.
#root additive
rule additive
(multitive_additive | multitive) {
def value
first.value
end
}
end
rule multitive_additive
(multitive additive_op additive) {
def value
if additive_op == '+'
multitive.value + additive.value
else
multitive.value - additive.value
end
end
}
end
rule multitive
(primary_multitive | primary) {
def value
first.value
end
}
end
rule primary_multitive
(primary multitive_op multitive) {
def value
if multitive_op == '*'
primary.value * multitive.value
else
primary.value / multitive.value
end
end
}
end
rule primary
(additive_paren | number) {
def value
first.value
end
}
end
rule additive_paren
('(' additive ')') {
def value
additive.value
end
}
end
rule additive_op
(plus | minus) {
def ==(other)
text.strip == other
end
}
end
rule multitive_op
(star | slash) {
def ==(other)
text.strip == other
end
}
end
rule number
(float | integer) {
def value
first.value
end
}
end
rule float
(integer '.' integer) {
def value
text.to_f
end
}
end
rule integer
[0-9]+ {
def value
text.to_i
end
}
end
rule lparen '(' space end
rule rparen ')' space end
rule plus '+' space end
rule minus '-' space end
rule star '*' space end
rule slash '/' space end
rule space
/[ \t\n\r]*/
end
end
Version data entries
13 entries across 13 versions & 1 rubygems