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// https://unicode-org.github.io/icu/userguide/format_parse/messages/
// https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/text/MessageFormat.html
(function (Prism) {
/**
* @param {string} source
* @param {number} level
* @returns {string}
*/
function nested(source, level) {
if (level <= 0) {
return /[]/.source;
} else {
return source.replace(/<SELF>/g, function () {
return nested(source, level - 1);
});
}
}
var stringPattern = /'[{}:=,](?:[^']|'')*'(?!')/;
var escape = {
pattern: /''/,
greedy: true,
alias: 'operator',
};
var string = {
pattern: stringPattern,
greedy: true,
inside: {
escape: escape,
},
};
var argumentSource = nested(
/\{(?:[^{}']|'(?![{},'])|''|<STR>|<SELF>)*\}/.source.replace(
/<STR>/g,
function () {
return stringPattern.source;
}
),
8
);
var nestedMessage = {
pattern: RegExp(argumentSource),
inside: {
message: {
pattern: /^(\{)[\s\S]+(?=\}$)/,
lookbehind: true,
inside: null, // see below
},
'message-delimiter': {
pattern: /./,
alias: 'punctuation',
},
},
};
Prism.languages['icu-message-format'] = {
argument: {
pattern: RegExp(argumentSource),
greedy: true,
inside: {
content: {
pattern: /^(\{)[\s\S]+(?=\}$)/,
lookbehind: true,
inside: {
'argument-name': {
pattern: /^(\s*)[^{}:=,\s]+/,
lookbehind: true,
},
'choice-style': {
// https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1ChoiceFormat.html#details
pattern: /^(\s*,\s*choice\s*,\s*)\S(?:[\s\S]*\S)?/,
lookbehind: true,
inside: {
punctuation: /\|/,
range: {
pattern: /^(\s*)[+-]?(?:\d+(?:\.\d*)?|\u221e)\s*[<#\u2264]/,
lookbehind: true,
inside: {
operator: /[<#\u2264]/,
number: /\S+/,
},
},
rest: null, // see below
},
},
'plural-style': {
// https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/text/PluralFormat.html#:~:text=Patterns%20and%20Their%20Interpretation
pattern:
/^(\s*,\s*(?:plural|selectordinal)\s*,\s*)\S(?:[\s\S]*\S)?/,
lookbehind: true,
inside: {
offset: /^offset:\s*\d+/,
'nested-message': nestedMessage,
selector: {
pattern: /=\d+|[^{}:=,\s]+/,
inside: {
keyword: /^(?:few|many|one|other|two|zero)$/,
},
},
},
},
'select-style': {
// https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/text/SelectFormat.html#:~:text=Patterns%20and%20Their%20Interpretation
pattern: /^(\s*,\s*select\s*,\s*)\S(?:[\s\S]*\S)?/,
lookbehind: true,
inside: {
'nested-message': nestedMessage,
selector: {
pattern: /[^{}:=,\s]+/,
inside: {
keyword: /^other$/,
},
},
},
},
keyword: /\b(?:choice|plural|select|selectordinal)\b/,
'arg-type': {
pattern: /\b(?:date|duration|number|ordinal|spellout|time)\b/,
alias: 'keyword',
},
'arg-skeleton': {
pattern: /(,\s*)::[^{}:=,\s]+/,
lookbehind: true,
},
'arg-style': {
pattern:
/(,\s*)(?:currency|full|integer|long|medium|percent|short)(?=\s*$)/,
lookbehind: true,
},
'arg-style-text': {
pattern: RegExp(
/(^\s*,\s*(?=\S))/.source +
nested(/(?:[^{}']|'[^']*'|\{(?:<SELF>)?\})+/.source, 8) +
'$'
),
lookbehind: true,
alias: 'string',
},
punctuation: /,/,
},
},
'argument-delimiter': {
pattern: /./,
alias: 'operator',
},
},
},
escape: escape,
string: string,
};
nestedMessage.inside.message.inside = Prism.languages['icu-message-format'];
Prism.languages['icu-message-format'].argument.inside.content.inside[
'choice-style'
].inside.rest = Prism.languages['icu-message-format'];
})(Prism);
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