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export function addAstro(Prism) {
if (Prism.languages.astro) {
return;
}
let scriptLang;
if (Prism.languages.typescript) {
scriptLang = 'typescript';
} else {
scriptLang = 'javascript';
console.warn('Prism TypeScript language not loaded, Astro scripts will be treated as JavaScript.');
}
let script = Prism.util.clone(Prism.languages[scriptLang]);
let space = /(?:\s|\/\/.*(?!.)|\/\*(?:[^*]|\*(?!\/))\*\/)/.source;
let braces = /(?:\{(?:\{(?:\{[^{}]*\}|[^{}])*\}|[^{}])*\})/.source;
let spread = /(?:\{<S>*\.{3}(?:[^{}]|<BRACES>)*\})/.source;
/**
* @param {string} source
* @param {string} [flags]
*/
function re(source, flags) {
source = source
.replace(/<S>/g, function () {
return space;
})
.replace(/<BRACES>/g, function () {
return braces;
})
.replace(/<SPREAD>/g, function () {
return spread;
});
return RegExp(source, flags);
}
spread = re(spread).source;
Prism.languages.astro = Prism.languages.extend('markup', script);
Prism.languages.astro.tag.pattern = re(/<\/?(?:[\w.:-]+(?:<S>+(?:[\w.:$-]+(?:=(?:"(?:\\[^]|[^\\"])*"|'(?:\\[^]|[^\\'])*'|[^\s{'"/>=]+|<BRACES>))?|<SPREAD>))*<S>*\/?)?>/.source);
Prism.languages.astro.tag.inside['tag'].pattern = /^<\/?[^\s>\/]*/i;
Prism.languages.astro.tag.inside['attr-value'].pattern = /=(?!\{)(?:"(?:\\[^]|[^\\"])*"|'(?:\\[^]|[^\\'])*'|[^\s'">]+)/i;
Prism.languages.astro.tag.inside['tag'].inside['class-name'] = /^[A-Z]\w*(?:\.[A-Z]\w*)*$/;
Prism.languages.astro.tag.inside['comment'] = script['comment'];
Prism.languages.insertBefore(
'inside',
'attr-name',
{
spread: {
pattern: re(/<SPREAD>/.source),
inside: Prism.languages.astro,
},
},
Prism.languages.astro.tag
);
Prism.languages.insertBefore(
'inside',
'special-attr',
{
script: {
// Allow for two levels of nesting
pattern: re(/=<BRACES>/.source),
inside: {
'script-punctuation': {
pattern: /^=(?={)/,
alias: 'punctuation',
},
rest: Prism.languages.astro,
},
alias: `language-${scriptLang}`,
},
},
Prism.languages.astro.tag
);
// The following will handle plain text inside tags
let stringifyToken = function (token) {
if (!token) {
return '';
}
if (typeof token === 'string') {
return token;
}
if (typeof token.content === 'string') {
return token.content;
}
return token.content.map(stringifyToken).join('');
};
let walkTokens = function (tokens) {
let openedTags = [];
for (let i = 0; i < tokens.length; i++) {
let token = tokens[i];
// This breaks styles, not sure why
if (token.type === 'style') {
return;
}
let notTagNorBrace = false;
if (typeof token !== 'string') {
if (token.type === 'tag' && token.content[0] && token.content[0].type === 'tag') {
// We found a tag, now find its kind
if (token.content[0].content[0].content === '</') {
// Closing tag
if (openedTags.length > 0 && openedTags[openedTags.length - 1].tagName === stringifyToken(token.content[0].content[1])) {
// Pop matching opening tag
openedTags.pop();
}
} else {
if (token.content[token.content.length - 1].content === '/>') {
// Autoclosed tag, ignore
} else {
// Opening tag
openedTags.push({
tagName: stringifyToken(token.content[0].content[1]),
openedBraces: 0,
});
}
}
} else if (openedTags.length > 0 && token.type === 'punctuation' && token.content === '{') {
// Here we might have entered a Astro context inside a tag
openedTags[openedTags.length - 1].openedBraces++;
} else if (openedTags.length > 0 && openedTags[openedTags.length - 1].openedBraces > 0 && token.type === 'punctuation' && token.content === '}') {
// Here we might have left a Astro context inside a tag
openedTags[openedTags.length - 1].openedBraces--;
} else {
notTagNorBrace = true;
}
}
if (notTagNorBrace || typeof token === 'string') {
if (openedTags.length > 0 && openedTags[openedTags.length - 1].openedBraces === 0) {
// Here we are inside a tag, and not inside a Astro context.
// That's plain text: drop any tokens matched.
let plainText = stringifyToken(token);
// And merge text with adjacent text
if (i < tokens.length - 1 && (typeof tokens[i + 1] === 'string' || tokens[i + 1].type === 'plain-text')) {
plainText += stringifyToken(tokens[i + 1]);
tokens.splice(i + 1, 1);
}
if (i > 0 && (typeof tokens[i - 1] === 'string' || tokens[i - 1].type === 'plain-text')) {
plainText = stringifyToken(tokens[i - 1]) + plainText;
tokens.splice(i - 1, 1);
i--;
}
tokens[i] = new Prism.Token('plain-text', plainText, null, plainText);
}
}
if (token.content && typeof token.content !== 'string') {
walkTokens(token.content);
}
}
};
Prism.hooks.add('after-tokenize', function (env) {
if (env.language !== 'astro') {
return;
}
walkTokens(env.tokens);
});
}
|
