work.suroh.tk/node_modules/pug-strip-comments/index.js

71 lines
2.1 KiB
JavaScript
Raw Normal View History

2019-12-02 12:22:45 +00:00
'use strict';
var error = require('pug-error');
module.exports = stripComments;
function unexpectedToken (type, occasion, filename, line) {
var msg = '`' + type + '` encountered when ' + occasion;
throw error('UNEXPECTED_TOKEN', msg, { filename: filename, line: line });
}
function stripComments (input, options) {
options = options || {};
// Default: strip unbuffered comments and leave buffered ones alone
var stripUnbuffered = options.stripUnbuffered !== false;
var stripBuffered = options.stripBuffered === true;
var filename = options.filename;
var out = [];
// If we have encountered a comment token and are not sure if we have gotten
// out of the comment or not
var inComment = false;
// If we are sure that we are in a block comment and all tokens except
// `end-pipeless-text` should be ignored
var inPipelessText = false;
return input.filter(function (tok) {
switch (tok.type) {
case 'comment':
if (inComment) {
unexpectedToken(
'comment', 'already in a comment', filename, tok.line
);
} else {
inComment = tok.buffer ? stripBuffered : stripUnbuffered;
return !inComment;
}
case 'start-pipeless-text':
if (!inComment) return true;
if (inPipelessText) {
unexpectedToken(
'start-pipeless-text', 'already in pipeless text mode',
filename, tok.line
);
}
inPipelessText = true;
return false;
case 'end-pipeless-text':
if (!inComment) return true;
if (!inPipelessText) {
unexpectedToken(
'end-pipeless-text', 'not in pipeless text mode',
filename, tok.line
);
}
inPipelessText = false;
inComment = false;
return false;
// There might be a `text` right after `comment` but before
// `start-pipeless-text`. Treat it accordingly.
case 'text':
return !inComment;
default:
if (inPipelessText) return false;
inComment = false;
return true;
}
});
}