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|
module CodeRay
module Scanners
# Basic Javascript scanner
class Javascript < Scanner
include Streamable
register_for :javascript
helper :patterns
DEFAULT_OPTIONS = {
}
private
def scan_tokens tokens, options
first_bake = saved_tokens = nil
last_token_dot = false
last_state = nil
state = :initial
depth = nil
inline_block_stack = []
patterns = Patterns # avoid constant lookup
until eos?
match = nil
kind = nil
if state.instance_of? patterns::StringState
# {{{
match = scan_until(state.pattern) || scan_until(/\z/)
tokens << [match, :content] unless match.empty?
break if eos?
case match = getch
when state.delim
if state.paren
state.paren_depth -= 1
if state.paren_depth > 0
tokens << [match, :nesting_delimiter]
next
end
end
tokens << [match, :delimiter]
tokens << [:close, state.type]
state = state.next_state
when '\\'
if state.interpreted
if esc = scan(/ #{patterns::ESCAPE} /ox)
tokens << [match + esc, :char]
else
tokens << [match, :error]
end
else
case m = getch
when state.delim, '\\'
tokens << [match + m, :char]
when nil
tokens << [match, :error]
else
tokens << [match + m, :content]
end
end
when '#'
case peek(1)[0]
when ?{
inline_block_stack << [state, depth]
state = :initial
depth = 1
tokens << [:open, :inline]
tokens << [match + getch, :delimiter]
when ?$, ?@
tokens << [match, :escape]
last_state = state # scan one token as normal code, then return here
state = :initial
else
raise_inspect 'else-case # reached; #%p not handled' % peek(1), tokens
end
when state.paren
state.paren_depth += 1
tokens << [match, :nesting_delimiter]
else
raise_inspect 'else-case " reached; %p not handled, state = %p' % [match, state], tokens
end
next
# }}}
else
# {{{
if match = scan(/ [ \t\f]+ | \\? \n | \# .* /x)
case m = match[0]
when ?\s, ?\t, ?\f
match << scan(/\s*/) unless eos?
kind = :space
when ?\n, ?\\
kind = :space
match << scan(/\s*/) unless eos?
when ?#, ?=, ?_
kind = :comment
else
raise_inspect 'else-case _ reached, because case %p was not handled' % [matched[0].chr], tokens
end
tokens << [match, kind]
next
elsif state == :initial
# IDENTS #
if match = scan(/#{patterns::METHOD_NAME}/o)
kind = last_token_dot ? :ident :
patterns::IDENT_KIND[match]
# OPERATORS #
elsif (not last_token_dot and match = scan(/ ==?=? | \.\.?\.? | [\(\)\[\]\{\}] | :: | , /x)) or
(last_token_dot and match = scan(/#{patterns::METHOD_NAME_OPERATOR}/o))
last_token_dot = :set if match == '.' or match == '::'
kind = :operator
unless inline_block_stack.empty?
case match
when '{'
depth += 1
when '}'
depth -= 1
if depth == 0 # closing brace of inline block reached
state, depth = inline_block_stack.pop
tokens << [match, :delimiter]
kind = :inline
match = :close
end
end
end
elsif match = scan(/ ['"] /mx)
tokens << [:open, :string]
kind = :delimiter
state = patterns::StringState.new :string, match == '"', match # important for streaming
elsif match = scan(/#{patterns::NUMERIC}/o)
kind = if self[1] then :float else :integer end
elsif match = scan(/ \+\+ | -- | << | >> /x)
kind = :operator
elsif match = scan(/ [-+!~^]=? | [*|&]{1,2}=? | >>? /x)
kind = :operator
elsif match = scan(/ [\/%]=? | <(?:<|=>?)? | [?:;] /x)
kind = :operator
else
kind = :error
match = getch
end
end
# }}}
last_token_dot = last_token_dot == :set
if $DEBUG and not kind
raise_inspect 'Error token %p in line %d' %
[[match, kind], line], tokens, state
end
raise_inspect 'Empty token', tokens unless match
tokens << [match, kind]
if last_state
state = last_state
last_state = nil
end
end
end
inline_block_stack << [state] if state.is_a? patterns::StringState
until inline_block_stack.empty?
this_block = inline_block_stack.pop
tokens << [:close, :inline] if this_block.size > 1
state = this_block.first
tokens << [:close, state.type]
end
tokens
end
end
end
end
# vim:fdm=marker
|
