Scala example source code file (CommentFactoryBase.scala)
The CommentFactoryBase.scala Scala example source code/* NSC -- new Scala compiler
* Copyright 2007-2013 LAMP/EPFL
* @author Manohar Jonnalagedda
*/
package scala.tools.nsc
package doc
package base
import base.comment._
import scala.collection._
import scala.util.matching.Regex
import scala.reflect.internal.util.Position
import scala.language.postfixOps
/** The comment parser transforms raw comment strings into `Comment` objects.
* Call `parse` to run the parser. Note that the parser is stateless and
* should only be built once for a given Scaladoc run.
*
* @author Manohar Jonnalagedda
* @author Gilles Dubochet */
trait CommentFactoryBase { this: MemberLookupBase =>
val global: Global
import global.{ reporter, Symbol, NoSymbol }
/* Creates comments with necessary arguments */
def createComment (
body0: Option[Body] = None,
authors0: List[Body] = List.empty,
see0: List[Body] = List.empty,
result0: Option[Body] = None,
throws0: Map[String,Body] = Map.empty,
valueParams0: Map[String,Body] = Map.empty,
typeParams0: Map[String,Body] = Map.empty,
version0: Option[Body] = None,
since0: Option[Body] = None,
todo0: List[Body] = List.empty,
deprecated0: Option[Body] = None,
note0: List[Body] = List.empty,
example0: List[Body] = List.empty,
constructor0: Option[Body] = None,
source0: Option[String] = None,
inheritDiagram0: List[String] = List.empty,
contentDiagram0: List[String] = List.empty,
group0: Option[Body] = None,
groupDesc0: Map[String,Body] = Map.empty,
groupNames0: Map[String,Body] = Map.empty,
groupPrio0: Map[String,Body] = Map.empty
) : Comment = new Comment{
val body = if(body0 isDefined) body0.get else Body(Seq.empty)
val authors = authors0
val see = see0
val result = result0
val throws = throws0
val valueParams = valueParams0
val typeParams = typeParams0
val version = version0
val since = since0
val todo = todo0
val deprecated = deprecated0
val note = note0
val example = example0
val constructor = constructor0
val inheritDiagram = inheritDiagram0
val contentDiagram = contentDiagram0
val groupDesc = groupDesc0
val group =
group0 match {
case Some(Body(List(Paragraph(Chain(List(Summary(Text(groupId)))))))) => Some(groupId.toString.trim)
case _ => None
}
val groupPrio = groupPrio0 flatMap {
case (group, body) =>
try {
body match {
case Body(List(Paragraph(Chain(List(Summary(Text(prio))))))) => List(group -> prio.trim.toInt)
case _ => List()
}
} catch {
case _: java.lang.NumberFormatException => List()
}
}
val groupNames = groupNames0 flatMap {
case (group, body) =>
try {
body match {
case Body(List(Paragraph(Chain(List(Summary(Text(name))))))) if (!name.trim.contains("\n")) => List(group -> (name.trim))
case _ => List()
}
} catch {
case _: java.lang.NumberFormatException => List()
}
}
}
private val endOfText = '\u0003'
private val endOfLine = '\u000A'
/** Something that should not have happened, happened, and Scaladoc should exit. */
private def oops(msg: String): Nothing =
throw FatalError("program logic: " + msg)
/** The body of a line, dropping the (optional) start star-marker,
* one leading whitespace and all trailing whitespace. */
private val CleanCommentLine =
new Regex("""(?:\s*\*\s?)?(.*)""")
/** Dangerous HTML tags that should be replaced by something safer,
* such as wiki syntax, or that should be dropped. */
private val DangerousTags =
new Regex("""<(/?(div|ol|ul|li|h[1-6]|p))( [^>]*)?/?>|<!--.*-->""")
/** Maps a dangerous HTML tag to a safe wiki replacement, or an empty string
* if it cannot be salvaged. */
private def htmlReplacement(mtch: Regex.Match): String = mtch.group(1) match {
case "p" | "div" => "\n\n"
case "h1" => "\n= "
case "/h1" => " =\n"
case "h2" => "\n== "
case "/h2" => " ==\n"
case "h3" => "\n=== "
case "/h3" => " ===\n"
case "h4" | "h5" | "h6" => "\n==== "
case "/h4" | "/h5" | "/h6" => " ====\n"
case "li" => "\n * - "
case _ => ""
}
/** Javadoc tags that should be replaced by something useful, such as wiki
* syntax, or that should be dropped. */
private val JavadocTags =
new Regex("""\{\@(code|docRoot|inheritDoc|link|linkplain|literal|value)([^}]*)\}""")
/** Maps a javadoc tag to a useful wiki replacement, or an empty string if it cannot be salvaged. */
private def javadocReplacement(mtch: Regex.Match): String = mtch.group(1) match {
case "code" => "`" + mtch.group(2) + "`"
case "docRoot" => ""
case "inheritDoc" => ""
case "link" => "`" + mtch.group(2) + "`"
case "linkplain" => "`" + mtch.group(2) + "`"
case "literal" => mtch.group(2)
case "value" => "`" + mtch.group(2) + "`"
case _ => ""
}
/** Safe HTML tags that can be kept. */
private val SafeTags =
new Regex("""((&\w+;)|(&#\d+;)|(</?(abbr|acronym|address|area|a|bdo|big|blockquote|br|button|b|caption|cite|code|col|colgroup|dd|del|dfn|em|fieldset|form|hr|img|input|ins|i|kbd|label|legend|link|map|object|optgroup|option|param|pre|q|samp|select|small|span|strong|sub|sup|table|tbody|td|textarea|tfoot|th|thead|tr|tt|var)( [^>]*)?/?>))""")
private val safeTagMarker = '\u000E'
/** A Scaladoc tag not linked to a symbol and not followed by text */
private val SingleTagRegex =
new Regex("""\s*@(\S+)\s*""")
/** A Scaladoc tag not linked to a symbol. Returns the name of the tag, and the rest of the line. */
private val SimpleTagRegex =
new Regex("""\s*@(\S+)\s+(.*)""")
/** A Scaladoc tag linked to a symbol. Returns the name of the tag, the name
* of the symbol, and the rest of the line. */
private val SymbolTagRegex =
new Regex("""\s*@(param|tparam|throws|groupdesc|groupname|groupprio)\s+(\S*)\s*(.*)""")
/** The start of a scaladoc code block */
private val CodeBlockStartRegex =
new Regex("""(.*?)((?:\{\{\{)|(?:\u000E<pre(?: [^>]*)?>\u000E))(.*)""")
/** The end of a scaladoc code block */
private val CodeBlockEndRegex =
new Regex("""(.*?)((?:\}\}\})|(?:\u000E</pre>\u000E))(.*)""")
/** A key used for a tag map. The key is built from the name of the tag and
* from the linked symbol if the tag has one.
* Equality on tag keys is structural. */
private sealed abstract class TagKey {
def name: String
}
private final case class SimpleTagKey(name: String) extends TagKey
private final case class SymbolTagKey(name: String, symbol: String) extends TagKey
/** Parses a raw comment string into a `Comment` object.
* @param comment The expanded comment string (including start and end markers) to be parsed.
* @param src The raw comment source string.
* @param pos The position of the comment in source. */
protected def parseAtSymbol(comment: String, src: String, pos: Position, site: Symbol = NoSymbol): Comment = {
/** The cleaned raw comment as a list of lines. Cleaning removes comment
* start and end markers, line start markers and unnecessary whitespace. */
def clean(comment: String): List[String] = {
def cleanLine(line: String): String = {
//replaceAll removes trailing whitespaces
line.replaceAll("""\s+$""", "") match {
case CleanCommentLine(ctl) => ctl
case tl => tl
}
}
val strippedComment = comment.trim.stripPrefix("/*").stripSuffix("*/")
val safeComment = DangerousTags.replaceAllIn(strippedComment, { htmlReplacement(_) })
val javadoclessComment = JavadocTags.replaceAllIn(safeComment, { javadocReplacement(_) })
val markedTagComment =
SafeTags.replaceAllIn(javadoclessComment, { mtch =>
java.util.regex.Matcher.quoteReplacement(safeTagMarker + mtch.matched + safeTagMarker)
})
markedTagComment.lines.toList map (cleanLine(_))
}
/** Parses a comment (in the form of a list of lines) to a `Comment`
* instance, recursively on lines. To do so, it splits the whole comment
* into main body and tag bodies, then runs the `WikiParser` on each body
* before creating the comment instance.
*
* @param docBody The body of the comment parsed until now.
* @param tags All tags parsed until now.
* @param lastTagKey The last parsed tag, or `None` if the tag section hasn't started. Lines that are not tagged
* are part of the previous tag or, if none exists, of the body.
* @param remaining The lines that must still recursively be parsed.
* @param inCodeBlock Whether the next line is part of a code block (in which no tags must be read). */
def parse0 (
docBody: StringBuilder,
tags: Map[TagKey, List[String]],
lastTagKey: Option[TagKey],
remaining: List[String],
inCodeBlock: Boolean
): Comment = remaining match {
case CodeBlockStartRegex(before, marker, after) :: ls if (!inCodeBlock) =>
if (!before.trim.isEmpty && !after.trim.isEmpty)
parse0(docBody, tags, lastTagKey, before :: marker :: after :: ls, inCodeBlock = false)
else if (!before.trim.isEmpty)
parse0(docBody, tags, lastTagKey, before :: marker :: ls, inCodeBlock = false)
else if (!after.trim.isEmpty)
parse0(docBody, tags, lastTagKey, marker :: after :: ls, inCodeBlock = true)
else lastTagKey match {
case Some(key) =>
val value =
((tags get key): @unchecked) match {
case Some(b :: bs) => (b + endOfLine + marker) :: bs
case None => oops("lastTagKey set when no tag exists for key")
}
parse0(docBody, tags + (key -> value), lastTagKey, ls, inCodeBlock = true)
case None =>
parse0(docBody append endOfLine append marker, tags, lastTagKey, ls, inCodeBlock = true)
}
case CodeBlockEndRegex(before, marker, after) :: ls =>
if (!before.trim.isEmpty && !after.trim.isEmpty)
parse0(docBody, tags, lastTagKey, before :: marker :: after :: ls, inCodeBlock = true)
if (!before.trim.isEmpty)
parse0(docBody, tags, lastTagKey, before :: marker :: ls, inCodeBlock = true)
else if (!after.trim.isEmpty)
parse0(docBody, tags, lastTagKey, marker :: after :: ls, inCodeBlock = false)
else lastTagKey match {
case Some(key) =>
val value =
((tags get key): @unchecked) match {
case Some(b :: bs) => (b + endOfLine + marker) :: bs
case None => oops("lastTagKey set when no tag exists for key")
}
parse0(docBody, tags + (key -> value), lastTagKey, ls, inCodeBlock = false)
case None =>
parse0(docBody append endOfLine append marker, tags, lastTagKey, ls, inCodeBlock = false)
}
case SymbolTagRegex(name, sym, body) :: ls if (!inCodeBlock) =>
val key = SymbolTagKey(name, sym)
val value = body :: tags.getOrElse(key, Nil)
parse0(docBody, tags + (key -> value), Some(key), ls, inCodeBlock)
case SimpleTagRegex(name, body) :: ls if (!inCodeBlock) =>
val key = SimpleTagKey(name)
val value = body :: tags.getOrElse(key, Nil)
parse0(docBody, tags + (key -> value), Some(key), ls, inCodeBlock)
case SingleTagRegex(name) :: ls if (!inCodeBlock) =>
val key = SimpleTagKey(name)
val value = "" :: tags.getOrElse(key, Nil)
parse0(docBody, tags + (key -> value), Some(key), ls, inCodeBlock)
case line :: ls if (lastTagKey.isDefined) =>
val key = lastTagKey.get
val value =
((tags get key): @unchecked) match {
case Some(b :: bs) => (b + endOfLine + line) :: bs
case None => oops("lastTagKey set when no tag exists for key")
}
parse0(docBody, tags + (key -> value), lastTagKey, ls, inCodeBlock)
case line :: ls =>
if (docBody.length > 0) docBody append endOfLine
docBody append line
parse0(docBody, tags, lastTagKey, ls, inCodeBlock)
case Nil =>
// Take the {inheritance, content} diagram keys aside, as it doesn't need any parsing
val inheritDiagramTag = SimpleTagKey("inheritanceDiagram")
val contentDiagramTag = SimpleTagKey("contentDiagram")
val inheritDiagramText: List[String] = tags.get(inheritDiagramTag) match {
case Some(list) => list
case None => List.empty
}
val contentDiagramText: List[String] = tags.get(contentDiagramTag) match {
case Some(list) => list
case None => List.empty
}
val stripTags=List(inheritDiagramTag, contentDiagramTag, SimpleTagKey("template"), SimpleTagKey("documentable"))
val tagsWithoutDiagram = tags.filterNot(pair => stripTags.contains(pair._1))
val bodyTags: mutable.Map[TagKey, List[Body]] =
mutable.Map(tagsWithoutDiagram mapValues {tag => tag map (parseWikiAtSymbol(_, pos, site))} toSeq: _*)
def oneTag(key: SimpleTagKey): Option[Body] =
((bodyTags remove key): @unchecked) match {
case Some(r :: rs) =>
if (!rs.isEmpty) reporter.warning(pos, "Only one '@" + key.name + "' tag is allowed")
Some(r)
case None => None
}
def allTags(key: SimpleTagKey): List[Body] =
(bodyTags remove key) getOrElse Nil
def allSymsOneTag(key: TagKey): Map[String, Body] = {
val keys: Seq[SymbolTagKey] =
bodyTags.keys.toSeq flatMap {
case stk: SymbolTagKey if (stk.name == key.name) => Some(stk)
case stk: SimpleTagKey if (stk.name == key.name) =>
reporter.warning(pos, "Tag '@" + stk.name + "' must be followed by a symbol name")
None
case _ => None
}
val pairs: Seq[(String, Body)] =
for (key <- keys) yield {
val bs = (bodyTags remove key).get
if (bs.length > 1)
reporter.warning(pos, "Only one '@" + key.name + "' tag for symbol " + key.symbol + " is allowed")
(key.symbol, bs.head)
}
Map.empty[String, Body] ++ pairs
}
val com = createComment (
body0 = Some(parseWikiAtSymbol(docBody.toString, pos, site)),
authors0 = allTags(SimpleTagKey("author")),
see0 = allTags(SimpleTagKey("see")),
result0 = oneTag(SimpleTagKey("return")),
throws0 = allSymsOneTag(SimpleTagKey("throws")),
valueParams0 = allSymsOneTag(SimpleTagKey("param")),
typeParams0 = allSymsOneTag(SimpleTagKey("tparam")),
version0 = oneTag(SimpleTagKey("version")),
since0 = oneTag(SimpleTagKey("since")),
todo0 = allTags(SimpleTagKey("todo")),
deprecated0 = oneTag(SimpleTagKey("deprecated")),
note0 = allTags(SimpleTagKey("note")),
example0 = allTags(SimpleTagKey("example")),
constructor0 = oneTag(SimpleTagKey("constructor")),
source0 = Some(clean(src).mkString("\n")),
inheritDiagram0 = inheritDiagramText,
contentDiagram0 = contentDiagramText,
group0 = oneTag(SimpleTagKey("group")),
groupDesc0 = allSymsOneTag(SimpleTagKey("groupdesc")),
groupNames0 = allSymsOneTag(SimpleTagKey("groupname")),
groupPrio0 = allSymsOneTag(SimpleTagKey("groupprio"))
)
for ((key, _) <- bodyTags)
reporter.warning(pos, "Tag '@" + key.name + "' is not recognised")
com
}
parse0(new StringBuilder(comment.size), Map.empty, None, clean(comment), inCodeBlock = false)
}
/** Parses a string containing wiki syntax into a `Comment` object.
* Note that the string is assumed to be clean:
* - Removed Scaladoc start and end markers.
* - Removed start-of-line star and one whitespace afterwards (if present).
* - Removed all end-of-line whitespace.
* - Only `endOfLine` is used to mark line endings. */
def parseWikiAtSymbol(string: String, pos: Position, site: Symbol): Body = new WikiParser(string, pos, site).document()
/** TODO
*
* @author Ingo Maier
* @author Manohar Jonnalagedda
* @author Gilles Dubochet */
protected final class WikiParser(val buffer: String, pos: Position, site: Symbol) extends CharReader(buffer) { wiki =>
var summaryParsed = false
def document(): Body = {
val blocks = new mutable.ListBuffer[Block]
while (char != endOfText)
blocks += block()
Body(blocks.toList)
}
/* BLOCKS */
/** {{{ block ::= code | title | hrule | para }}} */
def block(): Block = {
if (checkSkipInitWhitespace("{{{"))
code()
else if (checkSkipInitWhitespace('='))
title()
else if (checkSkipInitWhitespace("----"))
hrule()
else if (checkList)
listBlock
else {
para()
}
}
/** listStyle ::= '-' spc | '1.' spc | 'I.' spc | 'i.' spc | 'A.' spc | 'a.' spc
* Characters used to build lists and their constructors */
protected val listStyles = Map[String, (Seq[Block] => Block)]( // TODO Should this be defined at some list companion?
"- " -> ( UnorderedList(_) ),
"1. " -> ( OrderedList(_,"decimal") ),
"I. " -> ( OrderedList(_,"upperRoman") ),
"i. " -> ( OrderedList(_,"lowerRoman") ),
"A. " -> ( OrderedList(_,"upperAlpha") ),
"a. " -> ( OrderedList(_,"lowerAlpha") )
)
/** Checks if the current line is formed with more than one space and one the listStyles */
def checkList =
(countWhitespace > 0) && (listStyles.keys exists { checkSkipInitWhitespace(_) })
/** {{{
* nListBlock ::= nLine { mListBlock }
* nLine ::= nSpc listStyle para '\n'
* }}}
* Where n and m stand for the number of spaces. When `m > n`, a new list is nested. */
def listBlock: Block = {
/** Consumes one list item block and returns it, or None if the block is
* not a list or a different list. */
def listLine(indent: Int, style: String): Option[Block] =
if (countWhitespace > indent && checkList)
Some(listBlock)
else if (countWhitespace != indent || !checkSkipInitWhitespace(style))
None
else {
jumpWhitespace()
jump(style)
val p = Paragraph(inline(isInlineEnd = false))
blockEnded("end of list line ")
Some(p)
}
/** Consumes all list item blocks (possibly with nested lists) of the
* same list and returns the list block. */
def listLevel(indent: Int, style: String): Block = {
val lines = mutable.ListBuffer.empty[Block]
var line: Option[Block] = listLine(indent, style)
while (line.isDefined) {
lines += line.get
line = listLine(indent, style)
}
val constructor = listStyles(style)
constructor(lines)
}
val indent = countWhitespace
val style = (listStyles.keys find { checkSkipInitWhitespace(_) }).getOrElse(listStyles.keys.head)
listLevel(indent, style)
}
def code(): Block = {
jumpWhitespace()
jump("{{{")
val str = readUntil("}}}")
if (char == endOfText)
reportError(pos, "unclosed code block")
else
jump("}}}")
blockEnded("code block")
Code(normalizeIndentation(str))
}
/** {{{ title ::= ('=' inline '=' | "==" inline "==" | ...) '\n' }}} */
def title(): Block = {
jumpWhitespace()
val inLevel = repeatJump('=')
val text = inline(check("=" * inLevel))
val outLevel = repeatJump('=', inLevel)
if (inLevel != outLevel)
reportError(pos, "unbalanced or unclosed heading")
blockEnded("heading")
Title(text, inLevel)
}
/** {{{ hrule ::= "----" { '-' } '\n' }}} */
def hrule(): Block = {
jumpWhitespace()
repeatJump('-')
blockEnded("horizontal rule")
HorizontalRule()
}
/** {{{ para ::= inline '\n' }}} */
def para(): Block = {
val p =
if (summaryParsed)
Paragraph(inline(isInlineEnd = false))
else {
val s = summary()
val r =
if (checkParaEnded()) List(s) else List(s, inline(isInlineEnd = false))
summaryParsed = true
Paragraph(Chain(r))
}
while (char == endOfLine && char != endOfText)
nextChar()
p
}
/* INLINES */
val OPEN_TAG = "^<([A-Za-z]+)( [^>]*)?(/?)>$".r
val CLOSE_TAG = "^</([A-Za-z]+)>$".r
private def readHTMLFrom(begin: HtmlTag): String = {
val list = mutable.ListBuffer.empty[String]
val stack = mutable.ListBuffer.empty[String]
begin.close match {
case Some(HtmlTag(CLOSE_TAG(s))) =>
stack += s
case _ =>
return ""
}
do {
val str = readUntil { char == safeTagMarker || char == endOfText }
nextChar()
list += str
str match {
case OPEN_TAG(s, _, standalone) => {
if (standalone != "/") {
stack += s
}
}
case CLOSE_TAG(s) => {
if (s == stack.last) {
stack.remove(stack.length-1)
}
}
case _ => ;
}
} while (stack.length > 0 && char != endOfText)
list mkString ""
}
def inline(isInlineEnd: => Boolean): Inline = {
def inline0(): Inline = {
if (char == safeTagMarker) {
val tag = htmlTag()
HtmlTag(tag.data + readHTMLFrom(tag))
}
else if (check("'''")) bold()
else if (check("''")) italic()
else if (check("`")) monospace()
else if (check("__")) underline()
else if (check("^")) superscript()
else if (check(",,")) subscript()
else if (check("[[")) link()
else {
val str = readUntil { char == safeTagMarker || check("''") || char == '`' || check("__") || char == '^' || check(",,") || check("[[") || isInlineEnd || checkParaEnded || char == endOfLine }
Text(str)
}
}
val inlines: List[Inline] = {
val iss = mutable.ListBuffer.empty[Inline]
iss += inline0()
while (!isInlineEnd && !checkParaEnded) {
val skipEndOfLine = if (char == endOfLine) {
nextChar()
true
} else {
false
}
val current = inline0()
(iss.last, current) match {
case (Text(t1), Text(t2)) if skipEndOfLine =>
iss.update(iss.length - 1, Text(t1 + endOfLine + t2))
case (i1, i2) if skipEndOfLine =>
iss ++= List(Text(endOfLine.toString), i2)
case _ => iss += current
}
}
iss.toList
}
inlines match {
case Nil => Text("")
case i :: Nil => i
case is => Chain(is)
}
}
def htmlTag(): HtmlTag = {
jump(safeTagMarker)
val read = readUntil(safeTagMarker)
if (char != endOfText) jump(safeTagMarker)
HtmlTag(read)
}
def bold(): Inline = {
jump("'''")
val i = inline(check("'''"))
jump("'''")
Bold(i)
}
def italic(): Inline = {
jump("''")
val i = inline(check("''"))
jump("''")
Italic(i)
}
def monospace(): Inline = {
jump("`")
val i = inline(check("`"))
jump("`")
Monospace(i)
}
def underline(): Inline = {
jump("__")
val i = inline(check("__"))
jump("__")
Underline(i)
}
def superscript(): Inline = {
jump("^")
val i = inline(check("^"))
if (jump("^")) {
Superscript(i)
} else {
Chain(Seq(Text("^"), i))
}
}
def subscript(): Inline = {
jump(",,")
val i = inline(check(",,"))
jump(",,")
Subscript(i)
}
def summary(): Inline = {
val i = inline(check("."))
Summary(
if (jump("."))
Chain(List(i, Text(".")))
else
i
)
}
def link(): Inline = {
val SchemeUri = """([a-z]+:.*)""".r
jump("[[")
val parens = 2 + repeatJump('[')
val stop = "]" * parens
//println("link with " + parens + " matching parens")
val target = readUntil { check(stop) || check(" ") }
val title =
if (!check(stop)) Some({
jump(" ")
inline(check(stop))
})
else None
jump(stop)
(target, title) match {
case (SchemeUri(uri), optTitle) =>
Link(uri, optTitle getOrElse Text(uri))
case (qualName, optTitle) =>
makeEntityLink(optTitle getOrElse Text(target), pos, target, site)
}
}
/* UTILITY */
/** {{{ eol ::= { whitespace } '\n' }}} */
def blockEnded(blockType: String): Unit = {
if (char != endOfLine && char != endOfText) {
reportError(pos, "no additional content on same line after " + blockType)
jumpUntil(endOfLine)
}
while (char == endOfLine)
nextChar()
}
/**
* Eliminates the (common) leading spaces in all lines, based on the first line
* For indented pieces of code, it reduces the indent to the least whitespace prefix:
* {{{
* indented example
* another indented line
* if (condition)
* then do something;
* ^ this is the least whitespace prefix
* }}}
*/
def normalizeIndentation(_code: String): String = {
val code = _code.trim
var maxSkip = Integer.MAX_VALUE
var crtSkip = 0
var wsArea = true
var index = 0
var firstLine = true
var emptyLine = true
while (index < code.length) {
code(index) match {
case ' ' =>
if (wsArea)
crtSkip += 1
case c =>
wsArea = (c == '\n')
maxSkip = if (firstLine || emptyLine) maxSkip else if (maxSkip <= crtSkip) maxSkip else crtSkip
crtSkip = if (c == '\n') 0 else crtSkip
firstLine = if (c == '\n') false else firstLine
emptyLine = if (c == '\n') true else false
}
index += 1
}
if (maxSkip == 0)
code
else {
index = 0
val builder = new StringBuilder
while (index < code.length) {
builder.append(code(index))
if (code(index) == '\n') {
// we want to skip as many spaces are available, if there are less spaces (like on empty lines, do not
// over-consume them)
index += 1
val limit = index + maxSkip
while ((index < code.length) && (code(index) == ' ') && index < limit)
index += 1
}
else
index += 1
}
builder.toString
}
}
def checkParaEnded(): Boolean = {
(char == endOfText) ||
((char == endOfLine) && {
val poff = offset
nextChar() // read EOL
val ok = {
checkSkipInitWhitespace(endOfLine) ||
checkSkipInitWhitespace('=') ||
checkSkipInitWhitespace("{{{") ||
checkList ||
checkSkipInitWhitespace('\u003D')
}
offset = poff
ok
})
}
def reportError(pos: Position, message: String) {
reporter.warning(pos, message)
}
}
protected sealed class CharReader(buffer: String) { reader =>
var offset: Int = 0
def char: Char =
if (offset >= buffer.length) endOfText else buffer charAt offset
final def nextChar() {
offset += 1
}
final def check(chars: String): Boolean = {
val poff = offset
val ok = jump(chars)
offset = poff
ok
}
def checkSkipInitWhitespace(c: Char): Boolean = {
val poff = offset
jumpWhitespace()
val ok = jump(c)
offset = poff
ok
}
def checkSkipInitWhitespace(chars: String): Boolean = {
val poff = offset
jumpWhitespace()
val (ok0, chars0) =
if (chars.charAt(0) == ' ')
(offset > poff, chars substring 1)
else
(true, chars)
val ok = ok0 && jump(chars0)
offset = poff
ok
}
def countWhitespace: Int = {
var count = 0
val poff = offset
while (isWhitespace(char) && char != endOfText) {
nextChar()
count += 1
}
offset = poff
count
}
/* JUMPERS */
/** jumps a character and consumes it
* @return true only if the correct character has been jumped */
final def jump(ch: Char): Boolean = {
if (char == ch) {
nextChar()
true
}
else false
}
/** jumps all the characters in chars, consuming them in the process.
* @return true only if the correct characters have been jumped */
final def jump(chars: String): Boolean = {
var index = 0
while (index < chars.length && char == chars.charAt(index) && char != endOfText) {
nextChar()
index += 1
}
index == chars.length
}
final def repeatJump(c: Char, max: Int = Int.MaxValue): Int = {
var count = 0
while (jump(c) && count < max)
count += 1
count
}
final def jumpUntil(ch: Char): Int = {
var count = 0
while (char != ch && char != endOfText) {
nextChar()
count += 1
}
count
}
final def jumpUntil(pred: => Boolean): Int = {
var count = 0
while (!pred && char != endOfText) {
nextChar()
count += 1
}
count
}
def jumpWhitespace() = jumpUntil(!isWhitespace(char))
/* READERS */
final def readUntil(c: Char): String = {
withRead {
while (char != c && char != endOfText) {
nextChar()
}
}
}
final def readUntil(chars: String): String = {
assert(chars.length > 0)
withRead {
val c = chars.charAt(0)
while (!check(chars) && char != endOfText) {
nextChar()
while (char != c && char != endOfText)
nextChar()
}
}
}
final def readUntil(pred: => Boolean): String = {
withRead {
while (char != endOfText && !pred) {
nextChar()
}
}
}
private def withRead(read: => Unit): String = {
val start = offset
read
buffer.substring(start, offset)
}
/* CHARS CLASSES */
def isWhitespace(c: Char) = c == ' ' || c == '\t'
}
}
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