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Added string interpolation for identifiers

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Stan Angeloff
2010-03-06 00:30:49 +02:00
committed by Jeremy Ashkenas
parent 965034e16e
commit fe7d5dfd19
3 changed files with 101 additions and 2 deletions
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32
src/lexer.coffee
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@@ -166,7 +166,7 @@ exports.Lexer: class Lexer
string_token: ->
return false unless string: @match STRING, 1
escaped: string.replace STRING_NEWLINES, " \\\n"
@token 'STRING', escaped
@interpolate_string escaped
@line += count string, "\n"
@i += string.length
true
@@ -340,6 +340,36 @@ exports.Lexer: class Lexer
assignment_error: ->
throw new Error 'SyntaxError: Reserved word "' + @value() + '" on line ' + @line + ' can\'t be assigned'
# Replace variables and block calls inside double-quoted strings.
interpolate_string: (escaped) ->
if escaped.length < 3 or escaped.indexOf('"') isnt 0
@token 'STRING', escaped
else
tokens: []
quote: escaped.substring(0, 1)
escaped: escaped.substring(1, escaped.length - 1)
while escaped.length
identifier_match: escaped.match /(^|[\s\S]*?(?:[\\]|\\\\)?)(\$([a-zA-Z_]\w*))/
if identifier_match
[group, before, identifier]: identifier_match
if before.substring(before.length - 1) is '\\'
tokens.push ['STRING', quote + before.substring(0, before.length - 1) + identifier + quote] if before.length
else
tokens.push ['STRING', quote + before + quote] if before.length
tokens.push ['IDENTIFIER', identifier.substring(1)]
escaped: escaped.substring(group.length)
else
tokens.push ['STRING', quote + escaped + quote]
escaped: ''
if tokens.length > 1
for i in [tokens.length - 1..1]
if tokens[i][0] is 'STRING' and tokens[i - 1][0] is 'STRING'
tokens.splice i - 1, 2, ['STRING', quote + tokens[i - 1][1].substring(1, tokens[i - 1][1].length - 1) +
tokens[i][1].substring(1, tokens[i][1].length - 1) + quote]
for each, i in tokens
@token each[0], each[1]
@token '+', '+' if i < tokens.length - 1
# Helpers
# -------