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Contents
# frozen_string_literal: true
module Nocode
module Util
# Takes in an expression and interpolates in any parameters using << >> notation.
# For example:
# input = { 'person' => 'hops' }
# Nocode::Util::StringTemplate.new("Hello, << person.name >>!").evaluate(input)
# Should produce: "Hello, hops!"
class StringTemplate
LEFT_TOKEN = '<<'
RIGHT_TOKEN = '>>'
SEPARATOR = '.'
REG_EXPR = /#{Regexp.quote(LEFT_TOKEN)}(.*?)#{Regexp.quote(RIGHT_TOKEN)}/.freeze
attr_reader :expression
def initialize(expression)
@expression = expression.to_s
freeze
end
def evaluate(values = {})
resolved = tokens_to_values(tokens, values)
tokens.inject(expression) do |memo, token|
memo.gsub("#{LEFT_TOKEN}#{token}#{RIGHT_TOKEN}", resolved[token].to_s)
end
end
private
def tokens
expression.to_s.scan(REG_EXPR).flatten
end
def tokens_to_values(tokens, values)
tokens.each_with_object({}) do |token, memo|
cleansed = token.strip
parts = cleansed.split(SEPARATOR)
value = values.dig(*parts)
memo[token] = value
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems