class Liquid::If
If is the conditional block
{% if user.admin %} Admin user! {% else %} Not admin user {% endif %} There are {% if count < 5 %} less {% else %} more {% endif %} items than you need.
Constants
- BOOLEAN_OPERATORS
- ExpressionsAndOperators
- Syntax
Public Class Methods
new(tag_name, markup, options)
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Calls superclass method
Liquid::Block.new
# File lib/liquid/tags/if.rb, line 17 def initialize(tag_name, markup, options) super @blocks = [] push_block('if'.freeze, markup) end
Public Instance Methods
nodelist()
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# File lib/liquid/tags/if.rb, line 28 def nodelist @blocks.map(&:attachment) end
parse(tokens)
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# File lib/liquid/tags/if.rb, line 23 def parse(tokens) while parse_body(@blocks.last.attachment, tokens) end end
render(context)
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# File lib/liquid/tags/if.rb, line 40 def render(context) context.stack do @blocks.each do |block| if block.evaluate(context) return block.attachment.render(context) end end ''.freeze end end
unknown_tag(tag, markup, tokens)
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Calls superclass method
Liquid::Block#unknown_tag
# File lib/liquid/tags/if.rb, line 32 def unknown_tag(tag, markup, tokens) if ['elsif'.freeze, 'else'.freeze].include?(tag) push_block(tag, markup) else super end end
Private Instance Methods
lax_parse(markup)
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# File lib/liquid/tags/if.rb, line 64 def lax_parse(markup) expressions = markup.scan(ExpressionsAndOperators) raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless expressions.pop =~ Syntax condition = Condition.new(Expression.parse($1), $2, Expression.parse($3)) until expressions.empty? operator = expressions.pop.to_s.strip raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless expressions.pop.to_s =~ Syntax new_condition = Condition.new(Expression.parse($1), $2, Expression.parse($3)) raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless BOOLEAN_OPERATORS.include?(operator) new_condition.send(operator, condition) condition = new_condition end condition end
parse_binary_comparison(p)
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# File lib/liquid/tags/if.rb, line 91 def parse_binary_comparison(p) condition = parse_comparison(p) if op = (p.id?('and'.freeze) || p.id?('or'.freeze)) condition.send(op, parse_binary_comparison(p)) end condition end
parse_comparison(p)
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# File lib/liquid/tags/if.rb, line 99 def parse_comparison(p) a = Expression.parse(p.expression) if op = p.consume?(:comparison) b = Expression.parse(p.expression) Condition.new(a, op, b) else Condition.new(a) end end
push_block(tag, markup)
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# File lib/liquid/tags/if.rb, line 53 def push_block(tag, markup) block = if tag == 'else'.freeze ElseCondition.new else parse_with_selected_parser(markup) end @blocks.push(block) block.attach(BlockBody.new) end
strict_parse(markup)
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# File lib/liquid/tags/if.rb, line 84 def strict_parse(markup) p = Parser.new(markup) condition = parse_binary_comparison(p) p.consume(:end_of_string) condition end