Class: LogStashCompilerLSCLGrammar::LogStash::Compiler::LSCL::AST::Branch
- Inherits:
-
Node
- Object
- Treetop::Runtime::SyntaxNode
- Node
- LogStashCompilerLSCLGrammar::LogStash::Compiler::LSCL::AST::Branch
show all
- Defined in:
- lib/logstash/compiler/lscl.rb
Constant Summary
Constants included
from Helpers
Helpers::AND_METHOD, Helpers::BOOLEAN_DSL_METHOD_SIGNATURE, Helpers::NAND_METHOD, Helpers::OR_METHOD, Helpers::XOR_METHOD
Instance Method Summary
collapse
Methods inherited from Node
#section_type
Methods included from Helpers
#base_id, #base_protocol, #base_source_with_metadata, #base_source_with_metadata=, #compose, #compose_for, #jdsl, jdsl, #line_and_column, #source_meta
Instance Method Details
#expr ⇒ Object
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# File 'lib/logstash/compiler/lscl.rb', line 215
def expr
exprs = []
else_stack = []
self.recursive_select(Plugin, If, Elsif, Else).each do |node|
if node.is_a?(If)
exprs << :if
exprs << expr_cond(node)
exprs << expr_body(node)
elsif node.is_a?(Elsif)
condition = expr_cond(node)
body = expr_body(node)
else_stack << [:if, condition, body]
elsif node.is_a?(Else)
body = expr_body(node)
if else_stack.size >= 1
else_stack.last << body
else
exprs << body
end
end
end
else_stack.reverse.each_cons(2) do |cons|
later,earlier = cons
earlier << later
end
exprs << else_stack.first
javaify_sexpr(exprs)
end
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#expr_body(node) ⇒ Object
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# File 'lib/logstash/compiler/lscl.rb', line 282
def expr_body(node)
[:compose, *node.recursive_select(Plugin, Branch).map(&:expr)]
end
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#expr_cond(node) ⇒ Object
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# File 'lib/logstash/compiler/lscl.rb', line 278
def expr_cond(node)
node.elements.find {|e| e.is_a?(Condition)}.expr
end
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#javaify_sexpr(sexpr) ⇒ Object
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# File 'lib/logstash/compiler/lscl.rb', line 251
def javaify_sexpr(sexpr)
return nil if sexpr.nil?
head, tail = sexpr.first
tail = sexpr[1..-1]
if head == :if
condition, t_branch, f_branch = tail
java_t_branch = t_branch && javaify_sexpr(t_branch)
java_f_branch = f_branch && javaify_sexpr(f_branch)
if java_t_branch || java_f_branch
jdsl.iIf(condition.source_with_metadata, condition, java_t_branch || jdsl.noop, java_f_branch || jdsl.noop)
else
jdsl.noop()
end
elsif head == :compose
tail && tail.size > 0 ? compose(*tail) : jdsl.noop
else
raise "Unknown expression #{sexpr}!"
end
end
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