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https://github.com/jashkenas/coffeescript.git
synced 2022-11-09 12:23:24 -05:00
reserving __extends and __hasProp
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Jeremy Ashkenas
parent
e02ab76edf
commit
f7427259ee
2 changed files with 31 additions and 30 deletions
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@ -13,9 +13,9 @@
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COFFEE_KEYWORDS = ["then", "unless", "yes", "no", "on", "off", "and", "or", "is", "isnt", "not", "of", "by", "where", "when"];
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// The list of keywords passed verbatim to the parser.
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KEYWORDS = JS_KEYWORDS.concat(COFFEE_KEYWORDS);
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// The list of keywords that are reserved by JavaScript, but not used, and aren't
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// used by CoffeeScript. Using these will throw an error at compile time.
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RESERVED = ["case", "default", "do", "function", "var", "void", "with", "const", "let", "debugger", "enum", "export", "import", "native"];
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// The list of keywords that are reserved by JavaScript, but not used, or are
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// used by CoffeeScript internally. Using these will throw an error.
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RESERVED = ["case", "default", "do", "function", "var", "void", "with", "const", "let", "debugger", "enum", "export", "import", "native", "__extends", "__hasProp"];
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// JavaScript keywords and reserved words together, excluding CoffeeScript ones.
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JS_FORBIDDEN = JS_KEYWORDS.concat(RESERVED);
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// Token matching regexes. (keep the IDENTIFIER regex in sync with AssignNode.)
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@ -29,11 +29,12 @@ COFFEE_KEYWORDS: [
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# The list of keywords passed verbatim to the parser.
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KEYWORDS: JS_KEYWORDS.concat COFFEE_KEYWORDS
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# The list of keywords that are reserved by JavaScript, but not used, and aren't
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# used by CoffeeScript. Using these will throw an error at compile time.
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# The list of keywords that are reserved by JavaScript, but not used, or are
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# used by CoffeeScript internally. Using these will throw an error.
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RESERVED: [
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"case", "default", "do", "function", "var", "void", "with"
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"const", "let", "debugger", "enum", "export", "import", "native"
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"const", "let", "debugger", "enum", "export", "import", "native",
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"__extends", "__hasProp"
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]
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# JavaScript keywords and reserved words together, excluding CoffeeScript ones.
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@ -99,7 +100,7 @@ exports.Lexer: class Lexer
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@extract_next_token()
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@close_indentation()
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(new Rewriter()).rewrite @tokens
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# At every position, run through this list of attempted matches,
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# short-circuiting if any of them succeed.
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extract_next_token: ->
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@ -113,9 +114,9 @@ exports.Lexer: class Lexer
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return if @comment_token()
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return if @whitespace_token()
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return @literal_token()
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# Tokenizers ==========================================================
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# Matches identifying literals: variables, keywords, method names, etc.
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identifier_token: ->
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return false unless id: @match IDENTIFIER, 1
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@ -134,14 +135,14 @@ exports.Lexer: class Lexer
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@token(tag, id)
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@i += id.length
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true
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# Matches numbers, including decimals, hex, and exponential notation.
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number_token: ->
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return false unless number: @match NUMBER, 1
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@token 'NUMBER', number
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@i += number.length
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true
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# Matches strings, including multi-line strings.
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string_token: ->
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return false unless string: @match STRING, 1
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@ -150,7 +151,7 @@ exports.Lexer: class Lexer
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@line += @count string, "\n"
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@i += string.length
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true
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# Matches heredocs, adjusting indentation to the correct level.
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heredoc_token: ->
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return false unless match = @chunk.match(HEREDOC)
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@ -163,14 +164,14 @@ exports.Lexer: class Lexer
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@line += @count match[1], "\n"
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@i += match[1].length
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true
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# Matches interpolated JavaScript.
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js_token: ->
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return false unless script: @match JS, 1
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@token 'JS', script.replace(JS_CLEANER, '')
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@i += script.length
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true
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# Matches regular expression literals.
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regex_token: ->
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return false unless regex: @match REGEX, 1
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@ -178,7 +179,7 @@ exports.Lexer: class Lexer
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@token 'REGEX', regex
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@i += regex.length
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true
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# Matches and conumes comments.
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comment_token: ->
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return false unless comment: @match COMMENT, 1
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@ -187,7 +188,7 @@ exports.Lexer: class Lexer
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@token 'TERMINATOR', "\n"
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@i += comment.length
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true
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# Record tokens for indentation differing from the previous line.
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indent_token: ->
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return false unless indent: @match MULTI_DENT, 1
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@ -207,7 +208,7 @@ exports.Lexer: class Lexer
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@outdent_token @indent - size
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@indent: size
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true
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# Record an oudent token or tokens, if we're moving back inwards past
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# multiple recorded indents.
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outdent_token: (move_out) ->
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@ -217,7 +218,7 @@ exports.Lexer: class Lexer
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move_out -= last_indent
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@token 'TERMINATOR', "\n" unless @tag() is 'TERMINATOR'
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true
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# Matches and consumes non-meaningful whitespace.
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whitespace_token: ->
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return false unless space: @match WHITESPACE, 1
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@ -225,18 +226,18 @@ exports.Lexer: class Lexer
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prev.spaced: true if prev
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@i += space.length
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true
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# Multiple newlines get merged together.
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# Use a trailing \ to escape newlines.
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newline_token: (newlines) ->
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@token 'TERMINATOR', "\n" unless @tag() is 'TERMINATOR'
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true
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# Tokens to explicitly escape newlines are removed once their job is done.
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suppress_newlines: (newlines) ->
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@tokens.pop() if @value() is "\\"
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true
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# We treat all other single characters as a token. Eg.: ( ) , . !
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# Multi-character operators are also literal tokens, so that Racc can assign
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# the proper order of operations.
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@ -265,29 +266,29 @@ exports.Lexer: class Lexer
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@token tag, value
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@i += value.length
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true
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# Helpers =============================================================
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# Add a token to the results, taking note of the line number.
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token: (tag, value) ->
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@tokens.push([tag, value, @line])
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# Look at a tag in the current token stream.
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tag: (index, tag) ->
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return unless tok: @prev(index)
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return tok[0]: tag if tag?
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tok[0]
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# Look at a value in the current token stream.
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value: (index, val) ->
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return unless tok: @prev(index)
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return tok[1]: val if val?
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tok[1]
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# Look at a previous token.
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prev: (index) ->
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@tokens[@tokens.length - (index or 1)]
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# Count the occurences of a character in a string.
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count: (string, letter) ->
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num: 0
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@ -296,13 +297,13 @@ exports.Lexer: class Lexer
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num += 1
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pos: string.indexOf(letter, pos + 1)
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num
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# Attempt to match a string against the current chunk, returning the indexed
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# match.
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match: (regex, index) ->
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return false unless m: @chunk.match(regex)
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if m then m[index] else false
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# A source of ambiguity in our grammar was parameter lists in function
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# definitions (as opposed to argument lists in function calls). Tag
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# parameter identifiers in order to avoid this. Also, parameter lists can
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@ -319,7 +320,7 @@ exports.Lexer: class Lexer
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when ')' then tok[0]: 'PARAM_END'
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when '(' then return tok[0]: 'PARAM_START'
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true
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# Close up all remaining open blocks. IF the first token is an indent,
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# axe it.
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close_indentation: ->
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