nixfilter/reader.js

Simplify the development of (UNIX) "Filters"

'use strict';
var StringDecoder, byte_reader, bytes_reader, character_reader, characters_reader, json_line_reader, line_reader;

bytes_reader = function() {
  return function(callback) {
    return callback;
  };
};

byte_reader = function() {
  return function(callback) {
    return bytes_reader()(function(input_bytes) {
      var i, input_byte, len;
      for (i = 0, len = input_bytes.length; i < len; i++) {
        input_byte = input_bytes[i];
        callback(input_byte);
      }
    });
  };
};

// Import the "StringDecoder" class from the "string_decoder" module
StringDecoder = require('string_decoder').StringDecoder;

characters_reader = function(encoding) {
  encoding = encoding || 'utf8';
  return function(callback) {
    var string_decoder;
    string_decoder = new StringDecoder(encoding);
    return function(input_bytes) {
      var input_characters;
      input_characters = string_decoder.write(input_bytes);
      if (input_characters.length > 0) {
        callback(input_characters);
      }
    };
  };
};

character_reader = function(encoding) {
  return function(callback) {
    return characters_reader(encoding)(function(input_characters) {
      var i, input_character, len;
      for (i = 0, len = input_characters.length; i < len; i++) {
        input_character = input_characters[i];
        callback(input_character);
      }
    });
  };
};

line_reader = function(encoding) {
  return function(callback) {
    var line_buffer;
    line_buffer = [];
    return character_reader(encoding)(function(input_character) {
      if (input_character === '\n') {
        callback(line_buffer.join(''));
        line_buffer = [];
      } else {
        line_buffer.push(input_character);
      }
    });
  };
};

json_line_reader = function(encoding) {
  return function(callback) {
    return line_reader(encoding)(function(input_line) {
      callback(JSON.parse(input_line));
    });
  };
};

// What this module exports
module.exports = {
  byte: byte_reader,
  bytes: bytes_reader,
  character: character_reader,
  characters: characters_reader,
  json_line: json_line_reader,
  line: line_reader
};

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