Class: Ruty::ParserController
- Inherits:
-
Object
- Object
- Ruty::ParserController
- Defined in:
- lib/ruty/parser.rb
Overview
parser controller. does the actual parsing, used by the tags to control it.
Instance Attribute Summary collapse
-
#first ⇒ Object
readonly
Returns the value of attribute first.
-
#storage ⇒ Object
readonly
Returns the value of attribute storage.
-
#tokenstream ⇒ Object
readonly
Returns the value of attribute tokenstream.
Instance Method Summary collapse
-
#fail(msg) ⇒ Object
fail with an template syntax error exception.
-
#initialize(stream, loader, name) ⇒ ParserController
constructor
A new instance of ParserController.
-
#load_local(name) ⇒ Object
use the loader to load a subtemplate.
-
#parse_all ⇒ Object
parse everything and return the nodelist for it.
-
#parse_arguments(arguments) ⇒ Object
alias for the method with the same name on the parser class.
-
#parse_until(&block) ⇒ Object
parse everything until the block returns true.
Constructor Details
#initialize(stream, loader, name) ⇒ ParserController
Returns a new instance of ParserController.
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# File 'lib/ruty/parser.rb', line 203 def initialize stream, loader, name @loader = loader @name = name @tokenstream = stream @first = true @storage = {} end |
Instance Attribute Details
#first ⇒ Object (readonly)
Returns the value of attribute first.
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# File 'lib/ruty/parser.rb', line 201 def first @first end |
#storage ⇒ Object (readonly)
Returns the value of attribute storage.
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# File 'lib/ruty/parser.rb', line 201 def storage @storage end |
#tokenstream ⇒ Object (readonly)
Returns the value of attribute tokenstream.
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# File 'lib/ruty/parser.rb', line 201 def tokenstream @tokenstream end |
Instance Method Details
#fail(msg) ⇒ Object
fail with an template syntax error exception.
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# File 'lib/ruty/parser.rb', line 212 def fail msg raise TemplateSyntaxError, msg end |
#load_local(name) ⇒ Object
use the loader to load a subtemplate
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# File 'lib/ruty/parser.rb', line 223 def load_local name raise TemplateRuntimeError, 'no loader defined' if not @loader @loader.load_local(name, @name) end |
#parse_all ⇒ Object
parse everything and return the nodelist for it
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# File 'lib/ruty/parser.rb', line 279 def parse_all parse_until { false } end |
#parse_arguments(arguments) ⇒ Object
alias for the method with the same name on the parser class
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# File 'lib/ruty/parser.rb', line 218 def parse_arguments arguments Parser::parse_arguments(arguments) end |
#parse_until(&block) ⇒ Object
parse everything until the block returns true
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# File 'lib/ruty/parser.rb', line 229 def parse_until &block result = Datastructure::NodeStream.new(self) while not @tokenstream.eos? token, value = @tokenstream.next # text tokens are returned just if the arn't empty if token == :text @first = false if @first and not value.strip.empty? result << Datastructure::TextNode.new(value) \ if not value.empty? # variables leave the parser just if they have just # one name and some optional filters on it. elsif token == :var @first = false names = [] filters = [] Parser::parse_arguments(value).each do |arg| if arg.is_a?(Array) filters << arg else names << arg end end fail('Invalid syntax for variable node') if names.size != 1 result << Datastructure::VariableNode.new(names[0], filters) # blocks are a bit more complicated. first they can act as # needle tokens for other blocks, on the other hand blocks # can have their own subprogram elsif token == :block p = value.split(/\s+/, 2) name = p[0].to_sym args = p[1] || '' if block.call(name, args) @first = false return result.to_nodelist end tag = Tags[name] fail("Unknown tag #{name.inspect}") if tag.nil? result << tag.new(self, args) @first = false end end result.to_nodelist end |