Exprash/src/exprash.sh

#!/bin/bash
# shellcheck disable=SC2034 # false flags nameref params

# =============
# Route Methods
# =============

# $1: path
function get() {
  [ "$REQUEST_METHOD" != "GET" ] && return 1;
  all "$1";
}

# $1: path
function post() {
  [ "$REQUEST_METHOD" != "POST" ] && return 1;
  all "$1";
}

# $1: path
function put() {
  [ "$REQUEST_METHOD" != "PUT" ] && return 1;
  all "$1";
}

# $1: path
function delete() {
  [ "$REQUEST_METHOD" != "DELETE" ] && return 1;
  all "$1";
}

# $1: path
function all() {
  [ "$routeHandled" -eq 1 ] && return 1;

  # Reset params
  params=();
  pathMatch "$1" params || return 1;

  routeHandled=1;
  return 0;
}

function use() {
  [ "$routeHandled" -eq 1 ] && return 1;
  routeHandled=1;
  return 0;
}

function next() {
  routeHandled=0;
}

# =================
# Request Functions
# =================

# $1: param name
function param() {
  printf '%s\n' "${params[$1]}";
}

# $1: param name
function hasParam() {
  [[ -v "params[$1]" ]];
}

# =========
# Internals
# =========

# $1: path
# $2: (nameref) array
function pathToArray() {
  readarray -t "$2" < <(printf '%s\n' "$1" | tr '/' '\n' | grep .);
}

# $1: route
# $2: (nameref) associative array for params
function pathMatch() {
  [ -z ${PATH_INFO+x} ] && return 1;
  [ -z ${1+x} ] && return 1;

  local path="$PATH_INFO";
  local route="$1";

  local pathArr;
  pathToArray "$path" pathArr;

  local routeArr;
  pathToArray "$route" routeArr;

  # Params associative array
  local -n routeParams="$2";

  # Not a match if pathArr and routeArr have different length
  [ "${#pathArr[@]}" -ne "${#routeArr[@]}" ] && return 1;

  for ((i=0; i<${#routeArr[@]}; i++)); do
    local routeComponent="${routeArr[$i]}";
    local pathComponent="${pathArr[$i]}";

    # If route component starts with ":"
    if [[ "$routeComponent" == :* ]]; then
      routeParams["${routeComponent:1}"]="$pathComponent";
    else
      # Confirm paths match
      [ "$routeComponent" != "$pathComponent" ] && return 1;
    fi;
  done;

  return 0;
}

# =======
# Globals
# =======
routeHandled=0;
declare -A params;