beta 2012.12.24 20:08

1 files changed, 52 insertions, 0 deletions

diff --git a/tex/context/base/cldf-prs.lua b/tex/context/base/cldf-prs.lua
new file mode 100644
index 000000000..42757be19
--- /dev/null
+++ b/tex/context/base/cldf-prs.lua
@@ -0,0 +1,52 @@
+if not modules then modules = { } end modules ['cldf-bas'] = {
+    version   = 1.001,
+    comment   = "companion to cldf-ini.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local lpegmatch, patterns = lpeg.match, lpeg.patterns
+local P, R, V, Cc, Cs = lpeg.P, lpeg.R, lpeg.V, lpeg.Cc, lpeg.Cs
+local format = string.format
+
+local cpatterns    = patterns.context or { }
+patterns.context   = cpatterns
+
+local backslash    = P("\\")
+local csname       = backslash * P(1) * (1-backslash)^0
+local sign         = P("+") / "\\textplus "
+                   + P("-") / "\\textminus "
+local leftbrace    = P("{")
+local rightbrace   = P("}")
+local nested       = P { leftbrace * (V(1) + (1-rightbrace))^0 * rightbrace }
+local subscript    = P("_")
+local superscript  = P("^")
+local utf8char     = patterns.utf8char
+local cardinal     = patterns.cardinal
+
+-- local content   = Cs(csname + nested + sign^-1 * (csname + cardinal + utf8char))
+-- local lowfirst  = subscript   * ( Cc("\\lohi{%s}{%s}") * content * superscript + Cc("\\low{%s}" ) ) * content / format
+-- local highfirst = superscript * ( Cc("\\hilo{%s}{%s}") * content * subscript   + Cc("\\high{%s}") ) * content / format
+-- local scripts   = Cs(lowfirst + highfirst)
+
+local scripts      = P { "start",
+                          start     = V("csname") + V("lowfirst") + V("highfirst"),
+                          csname    = csname,
+                          content   = Cs(V("csname") + nested + sign^-1 * (cardinal + utf8char)),
+                          lowfirst  = subscript   * ( Cc("\\lohi{%s}{%s}") * V("content") * superscript + Cc("\\low{%s}" ) ) * V("content") / format,
+                          highfirst = superscript * ( Cc("\\hilo{%s}{%s}") * V("content") * subscript   + Cc("\\high{%s}") ) * V("content") / format,
+                      }
+
+local scripted     = Cs((csname + scripts + utf8char)^0)
+
+cpatterns.scripts  = scripts
+cpatterns.csname   = csname
+cpatterns.scripted = scripted
+cpatterns.nested   = nested
+
+-- inspect(scripted)
+
+-- print(lpegmatch(scripted,"10^-3"))
+-- print(lpegmatch(scripted,"10^-a"))
+