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Contents
# Author:: Eric Crane (mailto:eric.crane@mac.com)
# Copyright:: Copyright (c) 2019 Eric Crane. All rights reserved.
#
# If something is true, do something.
#
module GlooLang
module Verbs
class If < GlooLang::Core::Verb
KEYWORD = 'if'.freeze
KEYWORD_SHORT = 'if'.freeze
THEN = 'then'.freeze
MISSING_EXPR_ERR = 'Missing Expression!'.freeze
#
# Run the verb.
#
def run
value = value_tokens
return if value.nil?
return unless evals_true( value )
run_then
end
#
# Get the Verb's keyword.
#
def self.keyword
return KEYWORD
end
#
# Get the Verb's keyword shortcut.
#
def self.keyword_shortcut
return KEYWORD_SHORT
end
# ---------------------------------------------------------------------
# Private functions
# ---------------------------------------------------------------------
private
#
# Get the list of tokens that represent the parameters
# of the if command.
#
def value_tokens
value = @tokens.before_token( THEN )
if value && value.count > 1
# The first token is the verb, so we drop it.
value = value[ 1..-1 ]
else
@engine.err MISSING_EXPR_ERR
end
return value
end
#
# Does the given value evalute to true?
#
def evals_true( value )
eval_result = false
if value.count.positive?
expr = GlooLang::Expr::Expression.new( @engine, value )
result = expr.evaluate
eval_result = true if result == true
eval_result = true if result.is_a?( Numeric ) && result != 0
end
return eval_result
end
#
# Run the 'then' command.
#
def run_then
cmd = @tokens.expr_after( THEN )
i = @engine.parser.parse_immediate cmd
return unless i
i.run
end
end
end
end
Version data entries
23 entries across 23 versions & 1 rubygems