instiki/lib/maruku/ext/math/parsing.rb

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2007-01-22 15:36:51 +01:00
module MaRuKu
class MDDocument
# Hash equation id (String) to equation element (MDElement)
attr_accessor :eqid2eq
end
end
# At least one slash inside
#RegInlineMath1 = /\$([^\$]*[\\][^\$]*)\$/
# No spaces around the delimiters
#RegInlineMath2 = /\$([^\s\$](?:[^\$]*[^\s\$])?)\$/
#RegInlineMath = Regexp::union(RegInlineMath1,RegInlineMath2)
# Everything goes; takes care of escaping the "\$" inside the expression
RegInlineMath = /\${1}((?:[^\$]|\\\$)+)\$/
MaRuKu::In::Markdown::
register_span_extension(:chars => ?$, :regexp => RegInlineMath) do
|doc, src, con|
if m = src.read_regexp(RegInlineMath)
math = m.captures.compact.first
con.push doc.md_inline_math(math)
true
else
#puts "not math: #{src.cur_chars 10}"
false
end
end
EquationStart = /^[ ]{0,3}(?:\\\[|\$\$)(.*)$/
EqLabel = /(?:\((\w+)\))/
OneLineEquation = /^[ ]{0,3}(?:\\\[|\$\$)(.*)(?:\\\]|\$\$)\s*#{EqLabel}?\s*$/
EquationEnd = /^(.*)(?:\\\]|\$\$)\s*#{EqLabel}?\s*$/
MaRuKu::In::Markdown::
register_block_extension(:regexp => EquationStart) do |doc, src, con|
# puts "Equation :#{self}"
first = src.shift_line
if first =~ OneLineEquation
math = $1
label = $2
con.push doc.md_equation($1, $2)
else
first =~ EquationStart
math = $1
label = nil
while true
if not src.cur_line
maruku_error "Stream finished while reading equation\n\n"+
add_tabs(math,1,'$> '), src, con
break
end
line = src.shift_line
if line =~ EquationEnd
math += $1 + "\n"
label = $2 if $2
break
else
math += line + "\n"
end
end
con.push doc.md_equation(math, label)
end
true
end
# This adds support for \eqref
RegEqrefLatex = /\\eqref\{(\w+)\}/
RegEqPar = /\(eq:(\w+)\)/
RegEqref = Regexp::union(RegEqrefLatex, RegEqPar)
MaRuKu::In::Markdown::
register_span_extension(:chars => [?\\, ?(], :regexp => RegEqref) do
|doc, src, con|
eqid = src.read_regexp(RegEqref).captures.compact.first
r = doc.md_el(:eqref, [], meta={:eqid=>eqid})
con.push r
true
end