Class: Handlebar::Template
- Inherits:
-
Object
- Object
- Handlebar::Template
- Defined in:
- lib/handlebar/template.rb
Defined Under Namespace
Classes: ArgumentError, MissingVariable, ParseError, RecursionError, TemplateHash, VariableTracker
Constant Summary collapse
- TOKEN_REGEXP =
Constants ============================================================
/((?:[^\{]|\{[^\{]|\{\{\{)+)|\{\{\s*([\&\%\$\.\:\*\/\=]|\?\!?)?([^\}]*)\}\}/.freeze
- TOKEN_TRIGGER =
/\{\{/.freeze
Instance Method Summary collapse
- #compile(options) ⇒ Object
-
#initialize(content, options = nil) ⇒ Template
constructor
Instance Methods =====================================================.
- #marshal_dump ⇒ Object
- #marshal_load(dump) ⇒ Object
- #render(variables = nil, templates = nil, parents = nil) ⇒ Object (also: #call)
- #to_proc ⇒ Object
- #to_yaml(dump) ⇒ Object
Constructor Details
#initialize(content, options = nil) ⇒ Template
Instance Methods =====================================================
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# File 'lib/handlebar/template.rb', line 30 def initialize(content, = nil) if () if (source = [:escape]) case (source.to_sym) when :html, :html_escape @escape_method = :html_escape when :text, nil # Default, ignored else raise ArgumentError, "Unknown escape source #{source}" end end end @content = case (content) when IO content.read else content.to_s end end |
Instance Method Details
#compile(options) ⇒ Object
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# File 'lib/handlebar/template.rb', line 147 def compile() escape_method = [:escape_method] sections = [:sections] templates = [:templates] variables = [:variables] source = [:source] stack = [ [ :base, nil, VariableTracker.new ] ] stack_variables = nil @content.scan(TOKEN_REGEXP).each do |text, tag_type, tag| if (text) text = text.sub(/\{(\{\{+)/, '\1').sub(/\}(\}\}+)/, '\1') source and source << "r<<#{text.inspect};" else tag = tag.strip tag = tag.empty? ? nil : tag.to_sym case (tag_type) when '&' # HTML escaped index = stack[-1][2][tag.inspect] source and source << "v&&r<<h.html_escape(v[#{tag.inspect}].to_s);" variables and variables[tag] = true when '%' # URI escaped index = stack[-1][2][tag.inspect] source and source << "v&&r<<h.uri_escape(v.is_a?(Array)?v[#{index}]:v[#{tag.inspect}]);" variables and variables[tag] = true when '$' # JavaScript escaped index = stack[-1][2][tag.inspect] source and source << "v&&r<<h.js_escape(v.is_a?(Array)?v[#{index}]:v[#{tag.inspect}]);" variables and variables[tag] = true when '.' # CSS escaped index = stack[-1][2][tag.inspect] source and source << "v&&r<<h.css_escape(v.is_a?(Array)?v[#{index}]:v[#{tag.inspect}]);" variables and variables[tag] = true when ':' # Defines start of a :section index = stack[-1][2][tag.inspect] stack_variables ||= 's=[];' stack << [ :section, tag, VariableTracker.new ] source and source << "if(v);s<<v;v=v.is_a?(Array)?v[#{index}]:(v.is_a?(Hash)&&v[#{tag.inspect}]);" source and source << "h.iterate(v){|v|;v=h.cast_as_vars(v, s);" sections and sections[tag] = true when '?', '?!' # Defines start of a ?conditional stack[-1][2][tag.inspect] # The stack will inherit the variable assignment locations from the # existing stack layer. stack << [ :conditional, tag, stack[-1][2] ] source and source << "#{tag_type=='?' ? 'if' : 'unless'}(v&&v.is_a?(Hash)&&v[#{tag.inspect}]);" variables and variables[tag] = true when '*' source and source << "_t=t&&t[#{tag.inspect}];r<<(_t.respond_to?(:call)?_t.call(v,t):_t.to_s);" templates and templates[tag] = true when '/' # Closes out a section or conditional closed = stack.pop case (closed[0]) when :section if (tag and tag != closed[1]) raise ParseError, "Template contains unexpected {{#{tag}}}, expected {{#{closed[1]}}}" end source and source << "};v=s.pop;end;" when :conditional source and source << "end;" when :base raise ParseError, "Unexpected {{#{tag}}}, too many tags closed" end when '=' # Literal insertion index = stack[-1][2][tag.inspect] source and source << "v&&r<<(v.is_a?(Array)?v[#{index}]:v[#{tag.inspect}]).to_s;" variables and variables[tag] = true else # Contextual insertion index = stack[-1][2][tag.inspect] subst = "v.is_a?(Array)?v[#{stack[-1][2][tag.inspect]}]:v[#{tag.inspect}]" if (escape_method) source and source << "v&&r<<h.#{escape_method}(#{subst}.to_s);" else source and source << "v&&r<<(#{subst}).to_s;" end variables and variables[tag] = true end end end unless (stack.length == 1) case (stack[1][0]) when :section raise ParseError, "Unclosed {{:#{stack[1][1]}}} in template" when :conditional raise ParseError, "Unclosed {{?#{stack[1][1]}}} in template" else raise ParseError, "Unclosed {{#{stack[1][1]}}} in template" end end if (source) source.replace("begin;c=false;h=Handlebar::Support;lambda{|v,t|raise RecursionError if(c);c=true;#{stack_variables}r='';#{source}c=false;r};end") end true end |
#marshal_dump ⇒ Object
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# File 'lib/handlebar/template.rb', line 290 def marshal_dump [ @content, { :escape => @escape_method } ] end |
#marshal_load(dump) ⇒ Object
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# File 'lib/handlebar/template.rb', line 294 def marshal_load(dump) @content, = dump @escape_method = [:escape] end |
#render(variables = nil, templates = nil, parents = nil) ⇒ Object Also known as: call
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# File 'lib/handlebar/template.rb', line 63 def render(variables = nil, templates = nil, parents = nil) variables = case (variables) when Array variables when Hash _variables = variables Hash.new do |h, k| h[k] = (_variables[k.to_sym] || _variables[k.to_s]) end else [ variables ] end if (templates) # Unless the template options have already been processed, mapping # will need to be performed. unless (templates.is_a?(TemplateHash)) _templates = templates templates = TemplateHash.new do |h, k| v = _templates[k] h[k] = case (v) when Handlebar::Template, Proc, Array v when TOKEN_TRIGGER self.class.new(v, :escape => @escape_method) else v.to_s end end end else templates = TemplateHash.new end if (parents) case (parents) when Array _parents = parents.dup _parent = _parents.shift unless (_parent.is_a?(Handlebar::Template)) _parent = self.class.new(_parent, :escape => @escape_method) end _parent.render( variables, templates.merge( nil => self.to_proc.call(variables, templates) ), _parents.empty? ? nil : _parents ) when Handlebar::Template, Proc parents.render( variables, templates.merge( nil => self.to_proc.call(variables, templates) ) ) when String _parent = parents unless (_parent.is_a?(Handlebar::Template)) _parent = self.class.new(_parent, :escape => @escape_method) end _parent.render( variables, templates.merge( nil => self.to_proc.call(variables, templates) ) ) else raise ArgumentError, "Invalid options passed in to parents" end else self.to_proc.call(variables, templates) end end |
#to_proc ⇒ Object
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# File 'lib/handlebar/template.rb', line 53 def to_proc @_proc ||= begin source = '' self.compile(:source => source, :escape_method => @escape_method) eval(source) end end |
#to_yaml(dump) ⇒ Object
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# File 'lib/handlebar/template.rb', line 280 def to_yaml(dump) _proc, @_proc = @_proc, nil super(dump) @_proc = _proc dump end |