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Fix the browser compiler crashing on extended characters in script blocks #4375

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merged 1 commit into from
Nov 28, 2016
Merged

Fix the browser compiler crashing on extended characters in script blocks #4375

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4 changes: 3 additions & 1 deletion lib/coffee-script/coffee-script.js
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7 changes: 6 additions & 1 deletion src/coffee-script.coffee
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,12 @@ base64encode = (src) -> switch
when typeof Buffer is 'function'
new Buffer(src).toString('base64')
when typeof btoa is 'function'
btoa(src)
# The contents of a <script> block are encoded via UTF-16, so if any extended
# characters are used in the block, btoa will fail as it maxes out at UTF-8.
# See https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem
# for the gory details, and for the solution implemented here.
btoa encodeURIComponent(src).replace /%([0-9A-F]{2})/g, (match, p1) ->
String.fromCharCode '0x' + p1
else
throw new Error('Unable to base64 encode inline sourcemap.')

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