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handlebars.js
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handlebars.js
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/*
Language: Handlebars
Requires: xml.js
Author: Robin Ward <robin.ward@gmail.com>
Description: Matcher for Handlebars as well as EmberJS additions.
Website: https://handlebarsjs.com
Category: template
*/
export default function (hljs) {
const BUILT_INS = {
'builtin-name': [
'action',
'bindattr',
'collection',
'component',
'concat',
'debugger',
'each',
'each-in',
'get',
'hash',
'if',
'in',
'input',
'link-to',
'loc',
'log',
'lookup',
'mut',
'outlet',
'partial',
'query-params',
'render',
'template',
'textarea',
'unbound',
'unless',
'view',
'with',
'yield'
].join(" ")
};
const LITERALS = {
'literal': [
'true',
'false',
'undefined',
'null'
].join(" ")
};
// as defined in https://handlebarsjs.com/guide/expressions.html#literal-segments
// this regex matches literal segments like ' abc ' or [ abc ] as well as helpers and paths
// like a/b, ./abc/cde, and abc.bcd
const IDENFIFIER_REGEX = /(".*?"|'.*?'|\[.*?\]|[^\s!"#%&'()*+,.\/;<=>@\[\\\]^`{|}~]+|\.|\/)+/;
// identifier followed by a equal-sign (without the equal sign)
const HASH_PARAM_REGEX = /(".*?"|'.*?'|\[.*?\]|[^\s!"#%&'()*+,.\/;<=>@\[\\\]^`{|}~]+)(?==)/;
const HELPER_NAME_OR_PATH_EXPRESSION = {
begin: IDENFIFIER_REGEX,
lexemes: /[\w.\/]+/
};
const HELPER_PARAMETER = hljs.inherit(HELPER_NAME_OR_PATH_EXPRESSION, {
keywords: LITERALS
});
const SUB_EXPRESSION = {
illegal: /\}\}/,
begin: /\(/, end: /\)/
// the "contains" is added below when all necessary sub-modes are defined
};
const HASH = {
// fka "attribute-assignment", parameters of the form 'key=value'
className: 'attr',
illegal: /\}\}/,
begin: HASH_PARAM_REGEX,
relevance: 0,
starts: {
begin: /=/,
end: /=/,
starts: {
contains: [
hljs.NUMBER_MODE,
hljs.QUOTE_STRING_MODE,
hljs.APOS_STRING_MODE,
HELPER_PARAMETER,
SUB_EXPRESSION
]
}
}
};
const BLOCK_PARAMS = {
// parameters of the form '{{#with x as | y |}}...{{/with}}'
begin: /as\s+\|/,
keywords: { keyword: 'as' },
end: /\|/,
contains: [
{
// define sub-mode in order to prevent highlighting of block-parameter named "as"
begin: /\w+/,
keywords: ''
}
]
}
const HELPER_PARAMETERS = {
contains: [
hljs.NUMBER_MODE,
hljs.QUOTE_STRING_MODE,
hljs.APOS_STRING_MODE,
BLOCK_PARAMS,
HASH,
HELPER_PARAMETER,
SUB_EXPRESSION
],
returnEnd: true
// the property "end" is defined through inheritance when the mode is used. If depends
// on the surrounding mode, but "endsWithParent" does not work here (i.e. it includes the
// end-token of the surrounding mode)
};
const SUB_EXPRESSION_CONTENTS = hljs.inherit(HELPER_NAME_OR_PATH_EXPRESSION, {
className: 'name',
keywords: BUILT_INS,
starts: hljs.inherit(HELPER_PARAMETERS, {
end: /\)/,
})
});
SUB_EXPRESSION.contains = [
SUB_EXPRESSION_CONTENTS
];
const OPENING_BLOCK_MUSTACHE_CONTENTS = hljs.inherit(HELPER_NAME_OR_PATH_EXPRESSION, {
keywords: BUILT_INS,
className: 'name',
starts: hljs.inherit(HELPER_PARAMETERS, {
end: /}}/,
})
});
const CLOSING_BLOCK_MUSTACHE_CONTENTS = hljs.inherit(HELPER_NAME_OR_PATH_EXPRESSION, {
keywords: BUILT_INS,
className: 'name'
});
const BASIC_MUSTACHE_CONTENTS = hljs.inherit(HELPER_NAME_OR_PATH_EXPRESSION, {
className: 'name',
keywords: BUILT_INS,
starts: hljs.inherit(HELPER_PARAMETERS, {
end: /}}/,
})
});
const ESCAPE_MUSTACHE_WITH_PRECEEDING_BACKSLASH = {begin: /\\\{\{/, skip: true};
const PREVENT_ESCAPE_WITH_ANOTHER_PRECEEDING_BACKSLASH = {begin: /\\\\(?=\{\{)/, skip: true};
return {
name: 'Handlebars',
aliases: ['hbs', 'html.hbs', 'html.handlebars', 'htmlbars'],
case_insensitive: true,
subLanguage: 'xml',
contains: [
ESCAPE_MUSTACHE_WITH_PRECEEDING_BACKSLASH,
PREVENT_ESCAPE_WITH_ANOTHER_PRECEEDING_BACKSLASH,
hljs.COMMENT(/\{\{!--/, /--\}\}/),
hljs.COMMENT(/\{\{!/, /\}\}/),
{
// open raw block "{{{{raw}}}} content not evaluated {{{{/raw}}}}"
className: 'template-tag',
begin: /\{\{\{\{(?!\/)/, end: /\}\}\}\}/,
contains: [OPENING_BLOCK_MUSTACHE_CONTENTS],
starts: {end: /\{\{\{\{\//, returnEnd: true, subLanguage: 'xml'}
},
{
// close raw block
className: 'template-tag',
begin: /\{\{\{\{\//, end: /\}\}\}\}/,
contains: [CLOSING_BLOCK_MUSTACHE_CONTENTS]
},
{
// open block statement
className: 'template-tag',
begin: /\{\{#/, end: /\}\}/,
contains: [OPENING_BLOCK_MUSTACHE_CONTENTS],
},
{
className: 'template-tag',
begin: /\{\{(?=else\}\})/,
end: /\}\}/,
keywords: 'else'
},
{
// closing block statement
className: 'template-tag',
begin: /\{\{\//, end: /\}\}/,
contains: [CLOSING_BLOCK_MUSTACHE_CONTENTS],
},
{
// template variable or helper-call that is NOT html-escaped
className: 'template-variable',
begin: /\{\{\{/, end: /\}\}\}/,
contains: [BASIC_MUSTACHE_CONTENTS]
},
{
// template variable or helper-call that is html-escaped
className: 'template-variable',
begin: /\{\{/, end: /\}\}/,
contains: [BASIC_MUSTACHE_CONTENTS]
}
]
};
}