module Antelope::Grammar::Loading::ClassMethods
Defines class methods on the grammar.
Public Instance Methods
# File lib/antelope/grammar/loading.rb, line 34 def from_ace_file(file_name) body = File.read(file_name) output = File.dirname(file_name) name = File.basename(file_name, ".ace") from_ace_string(name, output, body) end
Loads a grammar from a string. First runs the scanner and compiler over the string, and then instantiates a new Grammar
from the resultant.
@param name [String] the name of the grammar. @param output [String] the output directory. @param string [String] the grammar body. @return [Grammar] @see Ace::Scanner
@see Ace::Compiler
# File lib/antelope/grammar/loading.rb, line 68 def from_ace_string(name, output, string) scanner = Ace::Scanner.scan(string, name) compiler = Ace::Compiler.compile(scanner) new(name, output, compiler) end
# File lib/antelope/grammar/loading.rb, line 28 def from_dsl_file(file_name) body = File.read(file_name) output = File.dirname(file_name, File.extname(file_name)) from_dsl_string(file_name, output, body) end
Loads a grammar from a string. First runs the scanner and compiler over the string, and then instantiates a new Grammar
from the resultant.
@param file [String] the path of the grammar. This is
used for eval.
@param output [String] the output directory. @param string [String] the grammar body. @return [Grammar] @see DSL::Compiler
# File lib/antelope/grammar/loading.rb, line 51 def from_dsl_string(file, output, string) eval(string, TOPLEVEL_BINDING, file, 0) grammar = Antelope.grammar compiler = DSL::Compiler.compile(grammar[1], &grammar[2]) new(File.basename(file), output, compiler) end
Loads a grammar from a file. Assumes the output directory and name from the file name.
@param file_name [String] the file name. @return [Grammar] @see from_string
# File lib/antelope/grammar/loading.rb, line 15 def from_file(file_name) ext = File.extname(file_name) case ext when ".rb", ".ate" from_dsl_file(file_name) when ".ace" from_ace_file(file_name) else raise ArgumentError, "Unexpected file extension #{ext},"\ " expected one of .rb, .ate, or .ace" end end