Improve Normalization chapter a bit.

[matthijs/master-project/report.git] / pret-trans.lua

diff --git a/pret-trans.lua b/pret-trans.lua
index 6ad51b74574768036e04200f2be9b0734f60a1b2..062eceb536230b109585af5d19b8ec5a3f7e31ae 100644 (file)
--- a/pret-trans.lua
+++ b/pret-trans.lua
@@ -13,19 +13,22 @@ local vis = buffers.newvisualizer("trans")
 
 local commands = {}
 -- A command to create a horizontal rule.
-commands.rule = "\\blackrule[height=0.5pt,depth=0pt,width=.45\\textwidth]"
+commands.rule = "\\HLine[width=.40 * \\the\\textwidth]"
 -- Pretty printer to use for the stuff before and after the line
 commands.before_pret = "lam"
 commands.after_pret = "lam"
 -- Frame commands to use for the left (before + line + after) and right
 -- (conditions) parts. Should include an opening {, which will be closed
 -- automatically.
-commands.leftframe = "\\framed[offset=0mm,location=middle,strut=no,align=right,frame=off,width=.5\\textwidth]{\\sans"
-commands.rightframe = "\\framed[offset=0mm,location=middle,strut=no,align=right,frame=off,width=.5\\textwidth]{"
+commands.leftframe = "\\framed[offset=0mm,location=middle,strut=no,align=right,frame=off,width=.48\\textwidth]{\\sans"
+commands.rightframe = "\\framed[offset=0mm,location=middle,strut=no,align=right,frame=off,width=.48\\textwidth]{"
 
 -- A table to keep the lines in this buffer, so we can process them all at
 -- once at the end.
 local lines
+-- A counter to keep track of the mininum amount of indentation found in each
+-- display.
+local min_indent
 
 -- Some helper functions
 local function ltrim(s)
@@ -63,11 +66,23 @@ end
 -- Capture all lines, without generating any output
 function vis.begin_of_display()
     lines = {}
+    -- Let all the lambda pretty printing in this buffer use shared subscript
+    -- detection
+    buffers.visualizers.handlers.lam.begin_of_block()
+    min_indent = nil
 end
 function vis.begin_of_line(n)
     -- Don't generate output here
 end
 function vis.flush_line(str, nested)
+    -- Keep track of the minimum indent level of all lines. Note that we don't
+    -- look at empty lines, of course.
+    indent = utf.len(utf.match(str, "^%s*"))
+        -- Find the lowest indent (but don't count empty lines)
+    if (not min_indent or indent < min_indent) then
+        min_indent = indent
+    end
+
     table.insert(lines, str)
     -- Don't generate output here
 end
@@ -82,6 +97,12 @@ end
 -- We do the actual work here. Process all the lines in the buffer and
 -- generate output for them.
 function vis.end_of_display()
+    -- Strip indent that is present on every line
+    min_indent = min_indent or 0 
+    for i = 1,#lines do
+        lines[i] = utf.sub(lines[i], min_indent + 1)
+    end
+
     -- Find the horizontal rule, and see how long it is.
     len = nil
     for i = 1,#lines do
@@ -165,6 +186,7 @@ function vis.end_of_display()
     
     -- Clean up
     lines = {}
+    buffers.visualizers.handlers.lam.end_of_block()
 end
 
 -- vim: set sw=4 sts=4 expandtab ai: