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Contents
require_relative 'JSON_parser'
# Create a JSON parser object
parser = JSONParser.new
# Parse the input file with name given in command-line
if ARGV.empty?
msg = <<-END_MSG
Command-line symtax:
ruby #{__FILE__} filename
where:
filename is the name of a JSON file
Example:
ruby #{__FILE__} sample01.json
END_MSG
puts msg
exit(1)
end
file_name = ARGV[0]
result = parser.parse_file(file_name) # result object contains parse details
unless result.success?
# Stop if the parse failed...
puts "Parsing of '#{file_name}' failed"
exit(1)
end
# Generate a parse tree from the parse result
ptree = result.parse_tree
# Do something with the parse tree: render it on the output console.
# Step a: Let's create a parse tree visitor
visitor = Rley::ParseTreeVisitor.new(ptree)
# Step b: Select the rendition format to be JSON
renderer = Rley::Formatter::Json.new(STDOUT)
# Step c: Now emit the parse tree as JSON on the console output
puts "JSON rendering of the parse tree for '#{file_name}' input:"
renderer.render(visitor)
# End of file
Version data entries
13 entries across 13 versions & 1 rubygems