image substitution directive

1 files changed, 60 insertions, 3 deletions

diff --git a/rst_context.lua b/rst_context.lua
index 1ac5f96..36dbdfc 100644
--- a/rst_context.lua
+++ b/rst_context.lua
@@ -48,6 +48,7 @@ rst_context.last_section_level   = 0
 rst_context.anonymous_targets    = 0
 rst_context.anonymous_links      = 0
 rst_context.context_references   = {}
+rst_context.substitutions        = {}
 
 rst_context.current_footnote_number   = 0
 rst_context.current_symbolnote_number = 0
@@ -207,6 +208,11 @@ function rst_context.inline_internal_target (str)
     return "\\\\reference[__target_" .. rst_context.whitespace_to_underscore(str) .."]{}"
 end
 
+function rst_context.substitution_reference (str)
+    rst_context.addsetups("substitutions")
+    return [[{\\RSTsubstitution]] .. string.strip(str) .. "}"
+end
+
 function rst_context.escape (str)
     str = str:gsub("\\(.)", "%1")
     return str
@@ -228,9 +234,9 @@ local inline_parser = P{
                      + V"emphasis"
                      + V"inline_literal"
                      + V"interpreted_text"
-                     + V"inline_internal_target" -- TODO
+                     + V"inline_internal_target"
                      + V"footnote_reference"
---                   + V"substitution_reference" -- TODO
+                     + V"substitution_reference"
                      + V"link_standalone")
                     * V"succede_inline"),
 
@@ -389,6 +395,13 @@ local inline_parser = P{
                            / rst_context.inline_internal_target
                            ,
 
+    substitution_reference = V"bar"
+                           * C((1 - V"bar")^1)
+                           * V"bar"
+                           * (V"underscore" + V"double_underscore")^-1
+                           / rst_context.substitution_reference
+                           ,
+
 --------------------------------------------------------------------------------
 -- Urls
 --------------------------------------------------------------------------------
@@ -920,7 +933,7 @@ function rst_context.simple_table(tab)
     return head .. body .. tail
 end
 
-function rst_context.footnote(label, content)
+function rst_context.footnote (label, content)
     local tf = state.footnotes
     rst_context.addsetups("footnotes")
     if label:match("^%d+$") then -- all digits
@@ -945,6 +958,13 @@ function rst_context.footnote(label, content)
     return ""
 end
 
+function rst_context.substitution_definition (subtext, directive, data)
+    print(subtext,directive,data)
+    local rs = rst_context.substitutions
+    rs[subtext] = { directive = directive, data = data }
+    return "\n% substitution definition block\n"
+end
+
 optional_setups = {}
 function optional_setups.footnote_symbol ()
     local setup = [[
@@ -1024,4 +1044,41 @@ function optional_setups.references ()
     return refsection
 end
 
+function optional_setups.substitutions ()
+    local images_done = {}
+
+    local image = function(name, data)
+        local img = ""
+        if not images_done[name] then
+            img = img .. string.format([[
+
+\useexternalfigure[%s][%s][]
+]], name, data)
+        end
+        img = img .. string.format([[
+\def\RSTsubstitution%s{
+  \placefigure[here]{%s}{\externalfigure[%s]}
+}
+]], name, name, name)
+        return img
+    end
+
+    local substitutions = [[
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Substitutions                                                 %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+]]
+    local rs = rst_context.substitutions
+    for name, content in next, rs do
+        local directive, data = content.directive, content.data
+        name, data = string.strip(name), string.strip(data)
+        if string.strip(directive) == "image" then
+            substitutions = substitutions .. image(name, data)
+        end
+    end
+    return substitutions
+end
+
 return rst_context