codeql/ruby/ql/test/library-tests/ast/control/conditionals.rb

# Define some variables used below
a = 0
b = 0
c = 0
d = 0
e = 0
f = 0

# If expr with no else
if a > b then
    c
end

# If expr with single else
if a == b
    c
else
    d
end

# If expr with multiple nested elsif branches
if a == 0 then
    c
elsif a == 1 then
    d
elsif a == 2 then
    e
else
    f
end

# If expr with elsif and then no else
if a == 0
    b
elsif a == 1
    c
end

# Unless expr with no else
unless a > b then
    c
end

# Unless expr with else
unless a == b
    c
else
    d
end

# If-modified expr
a = b if c > d

# Unless-modified expr
a = b unless c < d

# Ternary if expr
a = b > c ? d + 1 : e - 2

# If expr with empty else (treated as no else)
if a > b then
    c
else
end

# If expr with empty then (treated as no then)
if a > b then
else
    c
end

# If expr with `&&` on same line as condition and then
if a && b then
    c
end

# If expr with `&&` at the start of a separate line before then
if a
    && b
then
    c
end

# If expr with `and` at the start of a separate line before then
# NOTE: This is not parsed correctly, `and b` is parsed as a call
if a
    and b
then
    c
end

# If expr with `||` at the start of a separate line before then
# NOTE: This is not parsed correctly due to the leading `||`
# if a
#     || b
# then
#     c
# end

# If expr with `or` at the start of a separate line before then
# NOTE: This is not parsed correctly, `or b` is parsed as a call
if a
    or b
then
    c
end

# If expr with repeated && at the start of a separate line before then
if a
    && b
    && c
then
    d
end

# If expr with alternating && and || at the start of lines
# NOTE: This is not parsed correctly due to the leading `||`
# if a
#   && b
#   || c
# then
#     d
# end

# If expr with operator at start of line and parentheses
# NOTE: This is not parsed correctly due to the leading `||`
# if a
#   && (b
#   || c)
# then
#     d
# end

# If expr with operator at start of line and parentheses
# NOTE: This is not parsed correctly due to the leading `||`
# if a
#   || (b
#   && c)
# then
#     d
# end

# If expr with && at end of line
if a &&
    b
then
    c
end