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Versions: 10
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Stored size: 1.88 KB
Contents
# frozen_string_literal: true
require_relative 'cli_options'
require_relative 'json_lexer'
require_relative 'json_minifier'
require_relative 'json_ast_builder'
prog_name = 'json_demo'
prog_version = '0.3.0'
cli_options = CLIOptions.new(prog_name, prog_version, ARGV)
if ARGV.empty?
puts 'Missing input file name.'
puts 'Use -h option for command-line help.'
exit(1)
end
file_name = ARGV[0]
tree_rep = cli_options[:rep]
renderer = nil
# Select the output format
case cli_options[:format]
when :ascii_tree
renderer = Rley::Formatter::Asciitree.new($stdout)
when :labelled
renderer = Rley::Formatter::BracketNotation.new($stdout)
when :minify
msg = "minify format works for 'cst' representation only"
raise StandardError, msg if tree_rep == :ast
renderer = JSONMinifier.new($stdout)
when :ruby
msg = "ruby format works for 'ast' representation only"
raise StandardError, msg if tree_rep == :cst
end
# Create a Rley facade object
# If requested, select AST representation
engine = Rley::Engine.new do |cfg|
builder = tree_rep == :ast ? JSONASTBuilder : nil
cfg.repr_builder = builder
end
########################################
# Step 1. Load a grammar for JSON
require_relative 'json_grammar'
engine.use_grammar(GrammarJSON)
input_source = nil
File.open(file_name, 'r') { |f| input_source = f.read }
lexer = JSONLexer.new(input_source)
result = engine.parse(lexer.tokens)
unless result.success?
# Stop if parse failed...
puts "Parsing of '#{file_name}' failed"
puts result.failure_reason.message
exit(1)
end
# Generate a parse tree from the parse result
ptree = engine.convert(result)
if renderer
# Let's create a parse tree visitor
visitor = engine.ptree_visitor(ptree)
# Now output formatted parse tree
renderer.render(visitor)
else
root = ptree.root
p(root.to_ruby) # Output the Ruby representation of the JSON input
end
# End of file
Version data entries
10 entries across 10 versions & 1 rubygems