--- /dev/null
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# LaTeX rendering of Markdown documents
+module markdown_latex_rendering
+
+import markdown_rendering
+
+# Markdown document renderer to LaTeX
+class LatexRenderer
+ super MdRenderer
+
+ # Generate the LaTeX document wrapper
+ #
+ # The header includes:
+ # * document class
+ # * package importation
+ # * begin and end document directives
+ var wrap_document = false is optional, writable
+
+ # LaTeX document class
+ #
+ # Default is `article`.
+ var document_class = "article" is optional, writable
+
+ # LaTeX document page format
+ #
+ # Default is `letter`.
+ var page_format = "letter" is optional, writable
+
+ # LaTeX font size
+ #
+ # Default is `10pt`.
+ var font_size = "10pt" is optional, writable
+
+ # Use `listings` package for code blocks?
+ var use_listings = false is optional, writable
+
+ # LaTeX output under construction
+ private var latex: Buffer is noinit
+
+ # Render `document` as LaTeX
+ redef fun render(document) do
+ latex = new Buffer
+ enter_visit(document)
+ return latex.write_to_string
+ end
+
+ redef fun visit(node) do node.render_latex(self)
+
+ # Indentation level
+ var indent = 0
+
+ # Add a raw `string` to the output
+ #
+ # Raw means that the string will not be escaped.
+ fun add_raw(string: String) do latex.append string
+
+ # Add `text` string to the output
+ #
+ # The string will be escaped.
+ fun add_text(text: String) do latex.append latex_escape(text)
+
+ # Add a blank line to the output
+ fun add_line do
+ if not latex.is_empty and latex.last != '\n' then
+ latex.add '\n'
+ end
+ end
+
+ # Add an indentation depending on `ident` level
+ fun add_indent do latex.append " " * indent
+
+ # Escape `string` to LaTeX
+ fun latex_escape(string: String): String do
+ var buffer = new Buffer
+ for i in [0 .. string.length[ do
+ var c = string.chars[i]
+ if c == '>' then
+ buffer.append "\\textgreater"
+ continue
+ else if c == '<' then
+ buffer.append "\\textless"
+ continue
+ else if c == '\\' then
+ buffer.append "\\textbackslash"
+ continue
+ else if escaped_chars.has(c) then
+ buffer.add '\\'
+ end
+ buffer.add c
+ end
+ return buffer.to_s
+ end
+
+ # LaTeX characters to escape
+ var escaped_chars = ['%', '$', '{', '}', '_', '#', '&']
+end
+
+redef class MdNode
+
+ # Render `self` as HTML
+ fun render_latex(v: LatexRenderer) do visit_all(v)
+end
+
+# Blocks
+
+redef class MdDocument
+ redef fun render_latex(v) do
+ var wrap_document = v.wrap_document
+ if v.wrap_document then
+ v.add_line
+ v.add_raw "\\documentclass[{v.page_format},{v.font_size}]\{{v.document_class}\}\n\n"
+ v.add_raw "\\usepackage[utf8]\{inputenc\}\n"
+ if v.use_listings then
+ v.add_raw "\\usepackage\{listings\}\n"
+ end
+ v.add_raw "\\usepackage\{hyperref\}\n"
+ v.add_raw "\\usepackage\{graphicx\}\n"
+ v.add_raw "\\usepackage\{ulem\}\n\n"
+ v.add_raw "\\begin\{document\}\n\n"
+ end
+ var node = first_child
+ while node != null do
+ v.enter_visit node
+ node = node.next
+ if node != null then v.add_raw "\n"
+ end
+ if wrap_document then
+ v.add_raw "\n\\end\{document\}\n"
+ end
+ end
+end
+
+redef class MdHeading
+ redef fun render_latex(v) do
+ var level = self.level
+ v.add_indent
+ v.add_line
+ if level == 1 then
+ v.add_raw "\\section\{"
+ else if level == 2 then
+ v.add_raw "\\subsection\{"
+ else if level == 3 then
+ v.add_raw "\\subsubsection\{"
+ else if level == 4 then
+ v.add_raw "\\paragraph\{"
+ else if level == 5 then
+ v.add_raw "\\subparagraph\{"
+ else
+ # use bold for level 6 headings
+ v.add_raw "\\textbf\{"
+ end
+ v.add_indent
+ visit_all(v)
+ v.add_raw "\}"
+ v.add_line
+ end
+end
+
+redef class MdBlockQuote
+ redef fun render_latex(v) do
+ v.add_line
+ v.add_indent
+ v.add_raw "\\begin\{quote\}"
+ v.add_line
+ v.indent += 2
+ visit_all(v)
+ v.indent -= 2
+ v.add_line
+ v.add_indent
+ v.add_raw "\\end\{quote\}"
+ v.add_line
+ end
+end
+
+redef class MdIndentedCodeBlock
+ redef fun render_latex(v) do
+ var directive = if v.use_listings then "lstlisting" else "verbatim"
+ v.add_line
+ v.add_indent
+ v.add_raw "\\begin\{{directive}\}"
+ v.add_line
+ v.add_raw literal or else ""
+ v.add_line
+ v.add_indent
+ v.add_raw "\\end\{{directive}\}"
+ v.add_line
+ end
+end
+
+redef class MdFencedCodeBlock
+ redef fun render_latex(v) do
+ var info = self.info
+ var lstlistings = v.use_listings
+ var directive = if lstlistings then "lstlisting" else "verbatim"
+ v.add_line
+ v.add_indent
+ v.add_raw "\\begin\{{directive}\}"
+ if lstlistings and info != null and not info.is_empty then
+ v.add_raw "[language={info}]"
+ end
+ v.add_line
+ v.add_raw literal or else ""
+ v.add_line
+ v.add_indent
+ v.add_raw "\\end\{{directive}\}"
+ v.add_line
+ end
+end
+
+redef class MdOrderedList
+ redef fun render_latex(v) do
+ var start = self.start_number
+ v.add_line
+ v.add_indent
+ v.add_raw "\\begin\{enumerate\}"
+ v.indent += 2
+ v.add_line
+ if start != 1 then
+ v.add_indent
+ v.add_raw "\\setcounter\{enum{nesting_level}\}\{{start}\}"
+ v.add_line
+ end
+ visit_all(v)
+ v.indent -= 2
+ v.add_line
+ v.add_indent
+ v.add_raw "\\end\{enumerate\}"
+ v.add_line
+ end
+
+ # Depth of ordered list
+ #
+ # Used to compute the `setcounter` level.
+ fun nesting_level: String do
+ var nesting = 1
+
+ var parent = self.parent
+ while parent != null do
+ if parent isa MdOrderedList then nesting += 1
+ parent = parent.parent
+ end
+
+ if nesting <= 3 then
+ return "i" * nesting
+ end
+ return "iv"
+ end
+end
+
+redef class MdUnorderedList
+ redef fun render_latex(v) do
+ v.add_line
+ v.add_indent
+ v.add_raw "\\begin\{itemize\}"
+ v.add_line
+ v.indent += 2
+ visit_all(v)
+ v.indent -= 2
+ v.add_line
+ v.add_indent
+ v.add_raw "\\end\{itemize\}"
+ v.add_line
+ end
+end
+
+redef class MdListItem
+ redef fun render_latex(v) do
+ v.add_indent
+ v.add_raw "\\item"
+ v.add_line
+ v.indent += 2
+ visit_all(v)
+ v.indent -= 2
+ v.add_line
+ end
+end
+
+redef class MdThematicBreak
+ redef fun render_latex(v) do
+ v.add_line
+ v.add_indent
+ v.add_raw "\\begin\{center\}\\rule\{3in\}\{0.4pt\}\\end\{center\}"
+ v.add_line
+ end
+end
+
+redef class MdParagraph
+ redef fun render_latex(v) do
+ v.add_indent
+ visit_all(v)
+ v.add_line
+ end
+end
+
+
+redef class MdHtmlBlock
+ redef fun render_latex(v) do
+ v.add_line
+ v.add_indent
+ v.add_raw "\\begin\{verbatim\}"
+ v.add_line
+ v.add_indent
+ v.add_raw literal or else ""
+ v.add_line
+ v.add_indent
+ v.add_raw "\\end\{verbatim\}"
+ v.add_line
+ end
+end
+
+# Inlines
+
+redef class MdLineBreak
+ redef fun render_latex(v) do
+ v.add_line
+ v.add_indent
+ end
+end
+
+redef class MdCode
+ redef fun render_latex(v) do
+ v.add_raw "\\texttt\{"
+ v.add_text literal
+ v.add_raw "\}"
+ end
+end
+
+redef class MdEmphasis
+ redef fun render_latex(v) do
+ v.add_raw "\\textit\{"
+ visit_all(v)
+ v.add_raw "\}"
+ end
+end
+
+redef class MdStrongEmphasis
+ redef fun render_latex(v) do
+ v.add_raw "\\textbf\{"
+ visit_all(v)
+ v.add_raw "\}"
+ end
+end
+
+redef class MdHtmlInline
+ redef fun render_latex(v) do
+ v.add_raw "\\texttt\{"
+ v.add_raw v.latex_escape(literal)
+ v.add_raw "\}"
+ end
+end
+
+redef class MdImage
+ redef fun render_latex(v) do
+ v.add_raw "\\includegraphics\{"
+ v.add_text destination
+ v.add_raw "\}"
+ end
+
+ private fun alt_text: String do
+ var v = new RawTextVisitor
+ return v.render(self)
+ end
+end
+
+redef class MdLink
+ redef fun render_latex(v) do
+ if is_autolink then
+ v.add_raw "\\url\{"
+ v.add_text destination
+ v.add_raw "\}"
+ return
+ end
+ var title = self.title
+ v.add_raw "\\href\{"
+ v.add_text destination
+ v.add_raw "\}\{"
+ visit_all(v)
+ if title != null and not title.is_empty then
+ v.add_raw " ("
+ v.add_text title
+ v.add_raw ")"
+ end
+ v.add_raw "\}"
+ end
+end
+
+redef class MdText
+ redef fun render_latex(v) do
+ v.add_text literal
+ end
+end
nitlanguage / nit.git / blobdiff