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Original file line number | Diff line number | Diff line change |
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class Mustache | ||
class Generator | ||
def initialize(options = {}) | ||
@options = options | ||
end | ||
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def compile(exp) | ||
"\"#{compile!(exp)}\"" | ||
end | ||
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def compile!(exp) | ||
case exp.first | ||
when :multi | ||
exp[1..-1].map { |e| compile!(e) }.join | ||
when :static | ||
str(exp[1]) | ||
when :mustache | ||
send("on_#{exp[1]}", *exp[2..-1]) | ||
else | ||
raise "Unhandled exp: #{exp.first}" | ||
end | ||
end | ||
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def on_section(name, content) | ||
code = compile(content) | ||
ev(<<-compiled) | ||
if v = ctx[#{name.to_sym.inspect}] | ||
if v == true | ||
#{code} | ||
else | ||
v = [v] unless v.is_a?(Array) # shortcut when passed non-array | ||
v.map { |h| ctx.push(h); r = #{code}; ctx.pop; r }.join | ||
end | ||
end | ||
compiled | ||
end | ||
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def on_partial(name) | ||
ev("ctx.partial(#{name.to_sym.inspect})") | ||
end | ||
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def on_utag(name) | ||
ev("ctx[#{name.to_sym.inspect}]") | ||
end | ||
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def on_etag(name) | ||
ev("CGI.escapeHTML(ctx[#{name.to_sym.inspect}].to_s)") | ||
end | ||
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# An interpolation-friendly version of a string, for use within a | ||
# Ruby string. | ||
def ev(s) | ||
"#\{#{s}}" | ||
end | ||
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def str(s) | ||
s.inspect[1..-2] | ||
end | ||
end | ||
end |
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require 'strscan' | ||
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class Mustache | ||
class Parser | ||
class SyntaxError < StandardError | ||
def initialize(message, position) | ||
@message = message | ||
@lineno, @column, @line = position | ||
@stripped_line = @line.strip | ||
@stripped_column = @column - (@line.size - @line.lstrip.size) | ||
end | ||
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def to_s | ||
<<-EOF | ||
#{@message} | ||
Line #{@lineno} | ||
#{@stripped_line} | ||
#{' ' * @stripped_column}^ | ||
EOF | ||
end | ||
end | ||
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# After these types of tags, all whitespace will be skipped. | ||
SKIP_WHITESPACE = [ '#', '/' ] | ||
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# These types of tags allow any content, | ||
# the rest only allow \w+. | ||
ANY_CONTENT = [ '!', '=' ] | ||
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attr_reader :scanner, :result | ||
attr_writer :otag, :ctag | ||
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def initialize(options = {}) | ||
@options = {} | ||
end | ||
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def regexp(thing) | ||
/#{Regexp.escape(thing)}/ | ||
end | ||
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def otag | ||
@otag ||= '{{' | ||
end | ||
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def ctag | ||
@ctag ||= '}}' | ||
end | ||
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def compile(data) | ||
# Keeps information about opened sections. | ||
@sections = [] | ||
@result = [:multi] | ||
@scanner = StringScanner.new(data) | ||
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until @scanner.eos? | ||
scan_tags || scan_text | ||
end | ||
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unless @sections.empty? | ||
# We have parsed the whole file, but there's still opened sections. | ||
type, pos, result = @sections.pop | ||
error "Unclosed section #{type.inspect}", pos | ||
end | ||
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@result | ||
end | ||
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def scan_tags | ||
return unless @scanner.scan(regexp(otag)) | ||
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# Since {{= rewrites ctag, we store the ctag which should be used | ||
# when parsing this specific tag. | ||
current_ctag = self.ctag | ||
type = @scanner.scan(/#|\/|=|!|<|>|&|\{/) | ||
@scanner.skip(/\s*/) | ||
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if ANY_CONTENT.include?(type) | ||
r = /\s*#{regexp(type)}?#{regexp(current_ctag)}/ | ||
content = scan_until_exclusive(r) | ||
else | ||
content = @scanner.scan(/\w*/) | ||
end | ||
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error "Illegal content in tag" if content.empty? | ||
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case type | ||
when '#' | ||
block = [:multi] | ||
@result << [:mustache, :section, content, block] | ||
@sections << [content, position, @result] | ||
@result = block | ||
when '/' | ||
section, pos, result = @sections.pop | ||
@result = result | ||
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if section.nil? | ||
error "Closing unopened #{content.inspect}" | ||
elsif section != content | ||
error "Unclosed section #{section.inspect}", pos | ||
end | ||
when '!' | ||
# ignore comments | ||
when '=' | ||
self.otag, self.ctag = content.split(' ', 2) | ||
when '>', '<' | ||
@result << [:mustache, :partial, content] | ||
when '{', '&' | ||
type = "}" if type == "{" | ||
@result << [:mustache, :utag, content] | ||
else | ||
@result << [:mustache, :etag, content] | ||
end | ||
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@scanner.skip(/\s+/) | ||
@scanner.skip(regexp(type)) if type | ||
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unless close = @scanner.scan(regexp(current_ctag)) | ||
error "Unclosed tag" | ||
end | ||
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@scanner.skip(/\s+/) if SKIP_WHITESPACE.include?(type) | ||
end | ||
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def scan_text | ||
text = scan_until_exclusive(regexp(otag)) | ||
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if text.nil? | ||
# Couldn't find any otag, which means the rest is just static text. | ||
text = @scanner.rest | ||
# Mark as done. | ||
@scanner.clear | ||
end | ||
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@result << [:static, text] | ||
end | ||
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# Scans the string until the pattern is matched. Returns the substring | ||
# *excluding* the end of the match, advancing the scan pointer to that | ||
# location. If there is no match, nil is returned. | ||
def scan_until_exclusive(regexp) | ||
pos = @scanner.pos | ||
if @scanner.scan_until(regexp) | ||
@scanner.pos -= @scanner.matched.size | ||
@scanner.pre_match[pos..-1] | ||
end | ||
end | ||
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# Returns [lineno, column, line] | ||
def position | ||
# The rest of the current line | ||
rest = @scanner.check_until(/\n|\Z/).to_s.chomp | ||
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# What we have parsed so far | ||
parsed = @scanner.string[0...@scanner.pos] | ||
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lines = parsed.split("\n") | ||
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[ lines.size, lines.last.size - 1, lines.last + rest ] | ||
end | ||
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def error(message, pos = position) | ||
raise SyntaxError.new(message, pos) | ||
end | ||
end | ||
end |
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