Sha256: 2204cd71b1003b725720737713d8ad9620a9ad58811c0b444d873ca3493475f8
Contents?: true
Size: 1.55 KB
Versions: 12
Compression:
Stored size: 1.55 KB
Contents
grammar IndentedBlocks
rule top
# Initialise the indent stack with a sentinel:
&{|s| @indents = [-1] }
foo:('foo'?)
nested_blocks
{
def inspect
nested_blocks.inspect
end
}
end
rule nested_blocks
(
# Do not try to extract this semantic predicate into a new rule.
# It will be memo-ized incorrectly because @indents.last will change.
!{|s|
# Peek at the following indentation:
save = index; i = _nt_indentation; index = save
# We're closing if the indentation is less or the same as our enclosing block's:
closing = i.text_value.length <= @indents.last
}
block
)*
{
def inspect
elements.map{|e| e.block.inspect}*"\n"
end
}
end
rule block
indented_line # The block's opening line
&{|s| # Push the indent level to the stack
level = s[0].indentation.text_value.length
@indents << level
true
}
nested_blocks # Parse any nested blocks
&{|s| # Pop the indent stack
# Note that under no circumstances should "nested_blocks" fail, or the stack will be mis-aligned
@indents.pop
true
}
{
def inspect
indented_line.inspect +
(nested_blocks.elements.size > 0 ? (
"\n{\n" +
nested_blocks.elements.map { |content|
content.block.inspect+"\n"
}*'' +
"}"
)
: "")
end
}
end
rule indented_line
indentation text:((!"\n" .)*) "\n"
{
def inspect
text.text_value
end
}
end
rule indentation
' '*
end
end
Version data entries
12 entries across 12 versions & 2 rubygems