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Prettier CSS when viewing HTML

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Avoid wraps on comma in properties values (eg. in font list,
in rgb() values).
Also prettify CSS included in the HTML in debug view.
This commit is contained in:
poire-z
2019-07-14 22:18:33 +02:00
parent 9f3c85ed83
commit 8b612142b7
1 changed files with 34 additions and 10 deletions
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44
frontend/apps/reader/modules/readerhighlight.lua
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@@ -601,6 +601,30 @@ function ReaderHighlight:lookup(selected_word, selected_link)
end
end
local function prettifyCss(css_text)
-- This is not perfect, but enough to make some ugly CSS readable.
-- Get rid of \t so we can use it as a replacement/hiding char
css_text = css_text:gsub("\t", " ")
-- Wrap and indent declarations
css_text = css_text:gsub("%s*{%s*", " {\n ")
css_text = css_text:gsub(";%s*}%s*", ";\n}\n")
css_text = css_text:gsub(";%s*([^}])", ";\n %1")
css_text = css_text:gsub("%s*}%s*", "\n}\n")
-- Cleanup declarations
css_text = css_text:gsub("{[^}]*}", function(s)
s = s:gsub("%s*:%s*", ": ")
-- Temporarily hide/replace ',' in declaration so they
-- are not matched and made multi-lines by followup gsub
s = s:gsub("%s*,%s*", "\t")
return s
end)
-- Have each selector (separated by ',') on a new line
css_text = css_text:gsub("%s*,%s*", " ,\n")
-- Restore hidden ',' in declarations
css_text = css_text:gsub("\t", ", ")
return css_text
end
function ReaderHighlight:viewSelectionHTML(debug_view)
if self.ui.document.info.has_pages then
return
@@ -621,6 +645,15 @@ function ReaderHighlight:viewSelectionHTML(debug_view)
if debug_view then
html = html:gsub("\xC2\xA0", "␣") -- no break space: open box
html = html:gsub("\xC2\xAD", "⋅") -- soft hyphen: dot operator (smaller than middle dot ·)
-- Prettify inlined CSS (from <HEAD>, put in an internal
-- <body><stylesheet> element by crengine (the opening tag may
-- include some href=, or end with " ~X>" with some html_flags)
-- (We do that in debug_view mode only: as this may increase
-- the height of this section, we don't want to have to scroll
-- many pages to get to the HTML content on the initial view.)
html = html:gsub("(<stylesheet[^>]*>)%s*(.-)%s*(</stylesheet>)", function(pre, css_text, post)
return pre .. "\n" .. prettifyCss(css_text) .. post
end)
end
local TextViewer = require("ui/widget/textviewer")
local Font = require("ui/font")
@@ -644,18 +677,9 @@ function ReaderHighlight:viewSelectionHTML(debug_view)
enabled = css_text and true or false,
callback = function()
UIManager:close(cssviewer)
-- This is not perfect, but enough to make
-- some ugly CSS readable
css_text = css_text:gsub("%s*{%s*", " {\n ")
css_text = css_text:gsub(";%s*}%s*", ";\n}\n")
css_text = css_text:gsub(";%s*([^}])", ";\n %1")
css_text = css_text:gsub("%s*}%s*", "\n}\n")
css_text = css_text:gsub("%s*,%s*", " ,\n")
-- The last one is wrong inside {}, eg. with
-- "font-family: Georgia, serif"
UIManager:show(TextViewer:new{
title = css_files[i],
text = css_text,
text = prettifyCss(css_text),
text_face = Font:getFace("smallinfont"),
justified = false,
})