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Contents
require 'kuroko2/workflow/shell_scanner'
module Kuroko2
module Workflow
class ScriptParser
LINE_REGEXP = /\A(?<indent>\s+)?(?:(?<type>\w+):\s*(?<option>.+)?)?\z/
def initialize(script)
@script = script
@root = Node.new(:root)
@node_stack = [@root]
@indent_stack = [-1]
end
def parse(validate: true)
root = parse_lines(@script)
root.validate_all if validate
root
end
private
def parse_lines(script)
script.each_line.with_index do |line, no|
next if line.start_with?('#') || /^\s*$/ === line
if (matched = LINE_REGEXP.match(line.chomp))
raise_syntax_error(no, 'syntax error.') if matched.captures.all?(&:nil?)
indent = (matched[:indent] || '').length
node = Node.new(matched[:type], ShellScanner.new(matched[:option]).strip_comment.try!(:strip))
case indent <=> @indent_stack.last
when -1
if (i = @indent_stack.index(indent))
@node_stack = @node_stack[0, i]
@indent_stack = @indent_stack[0, i]
else
raise_syntax_error(no, 'inconsistent indentation.')
end
when 0
@node_stack.pop
@indent_stack.pop
when 1
# do nothing
end
@node_stack.last.append_child(node)
@node_stack << node
@indent_stack << indent
else
raise raise_syntax_error(no, 'syntax error.')
end
end
@root
end
def raise_syntax_error(no, message)
raise Workflow::SyntaxError, "(line #{no + 1}) #{message}"
end
end
end
end
Version data entries
22 entries across 22 versions & 1 rubygems