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package ru.circumflex
package markeven
import java.io.Writer
import collection.mutable.ListBuffer
/*!# Block processor
*/
class BlockProcessor(val out: Writer, val conf: MarkevenConf = EmptyMarkevenConf)
extends Processor {
val inline = new InlineProcessor(out, conf)
var selector = new Selector(conf)
var blockIndent = 0
def run(walk: Walker) {
while (walk.hasCurrent)
block(walk)
}
/*! Each time `block` is invoked it should spit out the whole rendered block
to `out` and move the `walk` to the end of that block.
Each tryXXX method should:
* return `false` and restore `in.position` to original value if
block does not match;
* return `true` if block matches, this case implies writing block
markup to `out` and wrapping `in.position` to the end of the block;
*/
def block(walk: Walker) {
walk.skipBlankLines()
countBlockIndent(walk)
if (tryCodeBlock(walk)) return
if (tryDiv(walk)) return
if (tryHtml(walk)) return
if (tryUnorderedList(walk)) return
if (tryOrderedList(walk)) return
if (tryHrTable(walk)) return
if (tryHeading(walk)) return
paragraph(walk)
}
/*! Indent is count by looking at the leading whitespace of
the first non-blank line of the block. Tab indents are not allowed. */
def countBlockIndent(walk: Walker) {
blockIndent = 0
var stop = false
while (!stop && walk.hasCurrent) {
if (walk.at(" ")) {
blockIndent += 1
walk.skip()
} else stop = true
}
}
/*! Scrolls walker to the start of the empty line, which usually terminates
the block. */
def scrollToTerm(walk: Walker) {
var found = false
while (!found && walk.hasCurrent)
if (walk.atNewLine && walk.skipNewLine().skipSpaces().atNewLine) {
walk.skipNewLine()
found = true
} else walk.skip()
}
/*! Selector expression is stripped from each block, if it exists. This may
result in new walker instantiation.*/
def stripSelector(walk: Walker): Walker = {
selector = new Selector(conf)
val startIdx = walk.position
while (walk.hasCurrent && !walk.atNewLine) {
if (walk.at("{")) {
walk.at(const.selector) match {
case Some(m) =>
val id = if (m.group(1) != null) m.group(1).substring(1) else ""
val classes = new ListBuffer[String]
if (m.group(2) != null) {
classes ++= m.group(2).split("\\.").filter(_ != "")
}
selector = new Selector(conf, id, classes)
walk.startFrom(startIdx)
return walk.exclude(m.start, m.end)
case _ =>
walk.skip()
}
} else walk.skip()
}
// no selector found
walk.startFrom(startIdx)
walk
}
/*! Unordered list should start with `* `. Every line indented beyond the marker
is included into list. */
def tryUnorderedList(walk: Walker): Boolean = {
if (walk.at("* ")) {
val startIdx = walk.position
var found = false
// scroll to the end of the block
while (!found && walk.hasCurrent) {
scrollToTerm(walk)
walk.skipBlankLines()
if (walk.atSpaces(blockIndent)) {
val i = walk.position
walk.skip(blockIndent)
if (!walk.at("* ") && !walk.atSpace) {
found = true
walk.startFrom(i)
}
} else found = true
}
// we got UL region, process it
val ul = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
processUl(ul)
true
} else false
}
def processUl(walk: Walker) {
assert(walk.at("* "))
out.write("")
// determining the bounds of each li
// skip the marker, must point to the start of first li
walk.skip(2)
var startIdx = walk.position
while (walk.hasCurrent) {
if (walk.atNewLine &&
walk.skipBlankLines().atSpaces(blockIndent) &&
walk.skip(blockIndent).at("* ")) {
val li = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
processLi(li)
walk.skip(2)
startIdx = walk.position
} else walk.skip()
}
// flush last li
val li = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
processLi(li)
// all li are done
out.write("")
}
/*! Ordered list should start with `1. `. Every line indented beyond the marker
is included into list. */
def tryOrderedList(walk: Walker): Boolean = {
if (walk.at("1. ")) {
val startIdx = walk.position
var found = false
// scroll to the end of the block
while (!found && walk.hasCurrent) {
scrollToTerm(walk)
walk.skipBlankLines()
if (walk.atSpaces(blockIndent)) {
val i = walk.position
walk.skip(blockIndent)
if (!lookingAtOlMarker(walk) && !walk.atSpace) {
found = true
walk.startFrom(i)
}
} else found = true
}
// we got OL region, process it
val ol = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
processOl(ol)
true
} else false
}
def lookingAtOlMarker(walk: Walker): Boolean = {
if (!walk.atDigit) return false
walk.lookahead { w =>
while (w.atDigit)
w.skip()
w.at(". ")
}
}
def processOl(walk: Walker) {
assert(walk.at("1. "))
out.write("")
// determining the bounds of each li
// skip the marker, must point to the start of the first li
while (walk.atDigit)
walk.skip()
walk.skip(2)
var startIdx = walk.position
while (walk.hasCurrent) {
if (walk.atNewLine &&
walk.skipBlankLines().atSpaces(blockIndent) &&
lookingAtOlMarker(walk.skip(blockIndent))) {
val li = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
processLi(li)
// skip next marker
while (walk.atDigit)
walk.skip()
walk.skip(2)
startIdx = walk.position
} else walk.skip()
}
// flush last li
val li = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
processLi(li)
// all li are done
out.write("")
}
def processLi(walk: Walker) {
out.write("")
// determine, whether the content is inline or block
val b = walk.lookahead { w =>
scrollToTerm(w)
w.hasCurrent // in other words, there is double line inside
}
val indent = blockIndent
if (b) {
while(walk.hasCurrent)
block(walk)
blockIndent = indent
} else inline.process(walk)
out.write("")
}
/*! Headings are simple: they start with '#', the amound of pounds
designates the level of the heading. */
def tryHeading(walk: Walker): Boolean = {
if (walk.at("#")) {
val oldPos = walk.position
var level = 0
while (walk.at("#")) {
walk.skip()
level += 1
}
if (walk.at(" ")) {
walk.skip()
val startIdx = walk.position
scrollToTerm(walk)
val h = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
out.write("")
inline.process(h)
out.write("")
true
} else {
walk.startFrom(oldPos)
false
}
} else false
}
/*! HRs and tables have one thing in common: they start with `---`.
They are processed together to decrease an impact on matching. */
def tryHrTable(walk: Walker): Boolean = {
if (walk.at("---")) {
val oldPos = walk.position
// walk towards the end of block
scrollToTerm(walk)
val b = stripSelector(new SubSeqWalker(walk, oldPos, walk.position))
processHrTable(b)
true
} else false
}
def processHrTable(walk: Walker) {
assert(walk.at("---"))
if (walk.atMatch(const.hr)) {
out.write("")
} else if (walk.atMatch(const.table)) {
processTable(walk)
} else processParagraph(walk, walk.getAbsolutePosition)
}
def processTable(walk: Walker) {
assert(walk.at("---"))
out.write("")) {
widthAttr = " width=\"100%\""
walk.skip()
}
out.write(widthAttr)
out.write(">")
// now determine the column count by reading the first row
val cells = readCells(walk)
val cols = cells.size
var alignAttrs: Seq[String] = Nil
var hasHead = false
// scan the next line for align data, if it fits the description of
// the separator
walk.at(const.tableSeparatorLine) match {
case Some(m) =>
hasHead = true
alignAttrs ++= readCells(new SubSeqWalker(walk, m.start, m.end)) map { w =>
val m = w.toString.trim
val left = m.startsWith(":")
val right = m.endsWith(":")
if (left && right) " align=\"center\""
else if (left) " align=\"left\""
else if (right) " align=\"right\""
else ""
}
walk.startFrom(m.end)
case _ =>
}
if (hasHead) {
out.write("")
writeRow("th", cells, Nil)
out.write("")
}
// now write body
out.write("")
var found = false
if (!hasHead) // don't forget that first row
writeRow("td", cells, alignAttrs)
while (!found && walk.hasCurrent) {
if (walk.at(const.tableEndLine).isDefined)
found = true
else
writeRow("td",
readCells(walk).take(cols).padTo(cols, new SubSeqWalker("")),
alignAttrs)
}
out.write("")
out.write("")
}
def writeRow(tag: String, cells: Seq[Walker], alignAttrs: Seq[String]) {
out.write("
")
var i = 0
val attrs = alignAttrs.take(cells.size).padTo(cells.size, "")
cells.foreach { w =>
out.write("<")
out.write(tag)
out.write(attrs(i))
out.write(">")
inline.process(w)
out.write("")
i += 1
}
out.write("
")
}
def readCells(walk: Walker): Seq[Walker] = {
val buffer = new ListBuffer[Walker]
// skip leading whitespace and |, respect \|
walk.skipWhitespaces()
if (walk.at("|")) walk.skip()
var i = walk.position
while (walk.hasCurrent && !walk.atNewLine) {
if (walk.at("\\|")) walk.skip(2)
if (walk.at("|")) {
buffer += new SubSeqWalker(walk, i, walk.position)
walk.skip()
i = walk.position
} else walk.skip()
}
// flush the last cell, if it's not empty
val w = new SubSeqWalker(walk, i, walk.position)
if (!w.atMatch(const.empty))
buffer += w
// move the walker to the next line
walk.skipNewLine()
buffer
}
/*! HTML fragments are left "as is" without further transformation. Selectors
are not applicable. */
def tryHtml(walk: Walker): Boolean = {
if (walk.at("<")) {
// try to match it with the tag
walk.at(const.htmlTag) match {
case Some(m) =>
val tag = m.group(0)
val tagName = m.group(1)
if (!const.blockTags.contains(tagName)) {
// this tag is not recognized as block-level, so the whole block will be
// processed like paragraph starting with inline element
return false
}
if (tag.startsWith(" // try html comment as well
walk.at(const.htmlComment) match {
case Some(m) =>
out.write(m.group(0))
walk.startFrom(m.end)
true
case _ =>
false
}
}
} else false
}
def scrollToClosingTag(walk: Walker, tagName: String) {
var found = false
while (!found && walk.hasCurrent) {
if (walk.at("<")) {
walk.at(const.htmlTag) match {
case Some(m) =>
val name = m.group(1)
walk.startFrom(m.end)
// we only care about tags matching `tagName` and not self-closing ones
if (name == tagName && m.group(2) == null) {
val tag = m.group(0)
if (tag.startsWith("
walk.skip()
}
} else walk.skip()
}
}
/*! To match div- and code-blocks we should be able to
find their closing markers, respecting backslash escapes.*/
def scrollToMarker(walk: Walker, marker: String) {
var found = false
while(!found && walk.hasCurrent) {
if (walk.at("\\" + marker))
walk.skip(marker.length + 1)
if (walk.at(marker)) found = true
else walk.skip()
}
}
def tryCodeBlock(walk: Walker): Boolean = {
if (walk.at("```")) {
val oldPos = walk.position
walk.skip(3)
val startIdx = walk.position
scrollToMarker(walk, "```")
val b = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
out.write("")
processCodeBlock(b)
out.write("
")
walk.skip(3).skipBlankLines()
true
} else false
}
def processCodeBlock(walk: Walker) {
// process line by line, removing the indent of the first line
walk.skipBlankLines()
countBlockIndent(walk)
var startIdx = walk.position
while (walk.hasCurrent) {
if (walk.atNewLine) { // got a line, process it
walk.skipNewLine()
val line = new SubSeqWalker(walk, startIdx, walk.position)
while (line.hasNext)
inline.flushCode(line)
out.write("\n")
// reposition to next line, removing the indent
if (walk.atSpaces(blockIndent)) walk.skip(blockIndent)
startIdx = walk.position
} else walk.skip()
}
}
def tryDiv(walk: Walker): Boolean = {
if (walk.at("~~~")) {
val oldPos = walk.position
walk.skip(3)
val startIdx = walk.position
scrollToMarker(walk, "~~~")
val b = stripSelector(new SubSeqWalker(walk, startIdx, walk.position))
out.write("")
while (b.hasCurrent) block(b)
out.write("
