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adding the list of javascript reserved words as syntax errors in CoffeeScript, so that no one uses them accidentally.

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Jeremy Ashkenas
2010-02-16 17:41:38 -05:00
parent 561a02c35f
commit e4bb6c91e7
2 changed files with 15 additions and 1 deletions
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8
src/lexer.coffee
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@@ -25,6 +25,13 @@ KEYWORDS: [
"super", "extends"
]
# The list of keywords that are reserved by JavaScript, but not used, and aren't
# used by CoffeeScript. Using these will throw an error at compile time.
RESERVED: [
"case", "default", "do", "function", "var", "void", "with", "class"
"const", "let", "debugger", "enum", "export", "import", "native"
]
# Token matching regexes. (keep the IDENTIFIER regex in sync with AssignNode.)
IDENTIFIER : /^([a-zA-Z$_](\w|\$)*)/
NUMBER : /^(\b((0(x|X)[0-9a-fA-F]+)|([0-9]+(\.[0-9]+)?(e[+\-]?[0-9]+)?)))\b/i
@@ -110,6 +117,7 @@ lex::identifier_token: ->
@tag(1, 'PROPERTY_ACCESS')
tag: 'IDENTIFIER'
tag: id.toUpperCase() if KEYWORDS.indexOf(id) >= 0 and not (ACCESSORS.indexOf(@tag()) >= 0)
throw new Error('SyntaxError: Reserved word "' + id + '" on line ' + @line) if RESERVED.indexOf(id) >= 0
tag: 'LEADING_WHEN' if tag is 'WHEN' and BEFORE_WHEN.indexOf(@tag()) >= 0
@token(tag, id)
@i += id.length