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intl-messageformat-parser
Advanced tools
Readme
Parses ICU Message strings into an AST via JavaScript.
This package implements a parser in JavaScript that parses the industry standard ICU Message strings — used for internationalization — into an AST. The produced AST can then be used by a compiler, like intl-messageformat
, to produce localized formatted strings for display to users.
This parser is written in PEG.js, a parser generator for JavaScript.
import {parse} from 'intl-messageformat-parser';
const ast = parse('this is {count, plural, one{# dog} other{# dogs}}');
Given an ICU Message string like this:
On {takenDate, date, short} {name} took {numPhotos, plural,
=0 {no photos.}
=1 {one photo.}
other {# photos.}
}
// Assume `msg` is the string above.
parse(msg);
This parser will produce this AST:
[
{
"type": 0,
"value": "On "
},
{
"type": 3,
"style": "short",
"value": "takenDate"
},
{
"type": 0,
"value": " "
},
{
"type": 1,
"value": "name"
},
{
"type": 0,
"value": " took "
},
{
"type": 6,
"pluralType": "cardinal",
"value": "numPhotos",
"offset": 0,
"options": [
{
"id": "=0",
"value": [
{
"type": 0,
"value": "no photos."
}
]
},
{
"id": "=1",
"value": [
{
"type": 0,
"value": "one photo."
}
]
},
{
"id": "other",
"value": [
{
"type": 0,
"value": "# photos."
}
]
}
]
}
]
ICU provides a wide array of pattern to customize date time format. However, not all of them are available via ECMA402's Intl API. Therefore, our parser only support the following patterns
Symbol | Meaning | Notes |
---|---|---|
G | Era designator | |
y | year | |
M | month in year | |
L | stand-alone month in year | |
d | day in month | |
E | day of week | |
e | local day of week | e..eee is not supported |
c | stand-alone local day of week | c..ccc is not supported |
a | AM/PM marker | |
h | Hour [1-12] | |
H | Hour [0-23] | |
K | Hour [0-11] | |
k | Hour [1-24] | |
m | Minute | |
s | Second | |
z | Time Zone |
complex_msg AST length 2053
normal_msg AST length 410
simple_msg AST length 79
string_msg AST length 36
complex_msg x 3,926 ops/sec ±2.37% (90 runs sampled)
normal_msg x 27,641 ops/sec ±3.93% (86 runs sampled)
simple_msg x 100,764 ops/sec ±5.35% (79 runs sampled)
string_msg x 120,362 ops/sec ±7.11% (74 runs sampled)
FAQs
Parses ICU Message strings into an AST via JavaScript.
The npm package intl-messageformat-parser receives a total of 828,341 weekly downloads. As such, intl-messageformat-parser popularity was classified as popular.
We found that intl-messageformat-parser demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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