thingsboard/ui/node_modules/messageformat-parser/README.md

messageformat-parser

A PEG.js parser for ICU MessageFormat strings – part of messageformat.js. Outputs an AST defined by parser.pegjs.

The generated parser function takes two parameters, first the string to be parsed, and a second optional parameter options, an object with the following possible keys:

• cardinal and ordinal – Arrays of valid plural categories for the current locale, used to validate plural and selectordinal keys. If these are missing or set to false, the full set of valid Unicode CLDR keys is used: 'zero', 'one', 'two', 'few', 'many', 'other'. To disable this check, pass in an empty array.

• strictFunctionParams – By default, function parameters are split on commas and trimmed, so the parameters in {x,fn, a, b } are parsed as ['a','b']. Setting strictFunctionParams to true will make the parser follow the ICU MessageFormat spec more closely, and result in a params array with a single element: [' a, b '].

Installation

npm install messageformat-parser

Usage

> var parse = require('messageformat-parser').parse;

> parse('So {wow}.')
[ 'So ', { type: 'argument', arg: 'wow' }, '.' ]

> parse('Such { thing }. { count, selectordinal, one {First} two {Second}' +
        '                  few {Third} other {#th} } word.')
[ 'Such ',
  { type: 'argument', arg: 'thing' },
  '. ',
  { type: 'selectordinal',
    arg: 'count',
    offset: 0,
    cases:
     [ { key: 'one', tokens: [ 'First' ] },
       { key: 'two', tokens: [ 'Second' ] },
       { key: 'few', tokens: [ 'Third' ] },
       { key: 'other', tokens: [ { type: 'octothorpe' }, 'th' ] } ] },
  ' word.' ]

> parse('Many{type,select,plural{ numbers}selectordinal{ counting}' +
                         'select{ choices}other{ some {type}}}.')
[ 'Many',
  { type: 'select',
    arg: 'type',
    cases:
     [ { key: 'plural', tokens: [ ' numbers' ] },
       { key: 'selectordinal', tokens: [ ' counting' ] },
       { key: 'select', tokens: [ ' choices' ] },
       { key: 'other', tokens: [ ' some',
                                 { type: 'argument', arg: 'type' } ] } ] },
  '.' ]

> parse('{Such compliance')
// SyntaxError: Expected ",", "}" or [ \t\n\r] but "c" found.

> var msg = '{words, plural, zero{No words} one{One word} other{# words}}';
> var englishKeys = { cardinal: [ 'one', 'other' ],
                      ordinal: [ 'one', 'two', 'few', 'other' ] };
> parse(msg)
[ { type: 'plural',
    arg: 'words',
    offset: 0,
    cases:
     [ { key: 'zero', tokens: [ 'No words' ] },
       { key: 'one', tokens: [ 'One word' ] },
       { key: 'other', tokens: [ { type: 'octothorpe' }, ' words' ] } ] } ]

> parse(msg, englishKeys)
// Error: Invalid key `zero` for argument `words`. Valid plural keys for this
//        locale are `one`, `other`, and explicit keys like `=0`.

Contributor License Agreement

See the messageformat.js README for details.