simple_route_matcher.js

function match(pattern, path) {
  const pattern_components = pattern.split('/')
  const path_components = path.split('/')

  if (pattern_components.length !== path_components.length) {
    return null
  }

  const params = {}

  for (let i = 0; i < pattern_components.length; i++) {
    const pattern_component = pattern_components[i]
    const path_component = path_components[i]

    const is_var = pattern_component.startsWith(':')
    if (is_var) {
      const key = pattern_component.slice(1)
      params[key] = path_component
    } else {
      if (pattern_component !== path_component) {
        return null
      }
    }
  }

  return params
}