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|
/* NSC -- new Scala compiler
* Copyright 2005-2007 LAMP/EPFL
* @author Burak Emir
*/
// $Id$
package scala.tools.nsc.ast.parser
import scala.collection.mutable
import scala.tools.nsc.util.{Position,NoPosition,SourceFile}
import scala.xml.{Text, TextBuffer}
import SourceFile.{SU,LF}
/** This trait ...
*
* @author Burak Emir
* @version 1.0
*/
trait MarkupParsers {self: Parsers =>
case object MissingEndTagException extends RuntimeException {
override def getMessage = "start tag was here: "
}
case object ConfusedAboutBracesException extends RuntimeException {
override def getMessage = " I encountered a '}' where I didn't expect one, maybe this tag isn't closed <"
}
case object TruncatedXML extends RuntimeException {
override def getMessage = "input ended while parsing XML"
}
import global._
//import posAssigner.atPos
class MarkupParser(parser: UnitParser, presWS: Boolean) /*with scala.xml.parsing.MarkupParser[Tree,Tree] */{
import Tokens.{EMPTY, LBRACE, RBRACE}
import parser.i2p
final val preserveWS = presWS
var input : ScannerInput = _
import parser.{symbXMLBuilder => handle}
def pos : Int = input.offset
var tmppos : Position = NoPosition
def ch = input.head
/** this method assign the next character to ch and advances in input */
def nextch = input.next // { s.in.next; /*s.xNext;*/ ch = s.in.ch ; pos = s.in.cpos }
/*[Duplicate]*/ var xEmbeddedBlock = false
/** munch expected XML token, report syntax error for unexpected.
*
* @param that ...
*/
/*[Duplicate]*/ def xToken(that: Char) {
if (ch == that) nextch
else if (ch == SU)
throw TruncatedXML
else reportSyntaxError("'" + that + "' expected instead of '" + ch + "'")
}
var debugLastStartElement = new mutable.Stack[(Int, String)]
/** checks whether next character starts a Scala block, if yes, skip it.
* @return true if next character starts a scala block
*/
/*[Duplicate]*/ def xCheckEmbeddedBlock: Boolean = {
// attentions, side-effect, used in xText
xEmbeddedBlock = (ch == '{') && { nextch; (ch != '{') }
//Console.println("pos = "+pos+" xEmbeddedBlock returns "+xEmbeddedBlock)
xEmbeddedBlock
}
/** parse attribute and add it to listmap
* [41] Attributes ::= { S Name Eq AttValue }
* AttValue ::= `'` { _ } `'`
* | `"` { _ } `"`
* | `{` scalablock `}`
*/
/*[Duplicate]*/ def xAttributes = {
var aMap = new mutable.HashMap[String, Tree]()
while (xml.Parsing.isNameStart(ch)) {
val key = xName
xEQ
val delim = ch
val pos1 = pos
val value: /* AttribValue[*/Tree/*]*/ = ch match {
case '"' | '\'' =>
nextch
val tmp = xAttributeValue(delim)
nextch
try {
handle.parseAttribute(pos1, tmp)
} catch {
case e =>
reportSyntaxError("error parsing attribute value")
parser.errorTermTree
}
case '{' =>
nextch
xEmbeddedExpr
case SU =>
throw TruncatedXML
case _ =>
reportSyntaxError("' or \" delimited attribute value" +
" or '{' scala-expr '}' expected" )
Literal(Constant("<syntax-error>"))
}
// well-formedness constraint: unique attribute names
if (aMap.contains(key)) {
reportSyntaxError( "attribute "+key+" may only be defined once" )
}
aMap.update(key, value)
if ((ch != '/') && (ch != '>')) {
xSpace
}
}
aMap
}
/** attribute value, terminated by either ' or ". value may not contain <.
* @param endch either ' or "
*/
/*[Duplicate]*/ def xAttributeValue(endCh: Char): String = {
val buf = new StringBuilder
while (ch != endCh) {
if (ch == SU)
throw TruncatedXML
buf append nextch
}
val str = buf.toString()
// @todo: normalize attribute value
// well-formedness constraint
if (str.indexOf('<') != -1) {
reportSyntaxError( "'<' not allowed in attrib value" ); ""
} else {
str
}
}
/** parse a start or empty tag.
* [40] STag ::= '<' Name { S Attribute } [S]
* [44] EmptyElemTag ::= '<' Name { S Attribute } [S]
*/
/*[Duplicate]*/ def xTag: (String, mutable.Map[String, Tree]) = {
val elemName = xName
xSpaceOpt
val aMap =
if (xml.Parsing.isNameStart(ch)) xAttributes
else new mutable.HashMap[String, Tree]()
(elemName, aMap)
}
/** [42] '<' xmlEndTag ::= '<' '/' Name S? '>'
*/
/*[Duplicate]*/ def xEndTag(startName: String) {
xToken('/')
val endName = xName
if (endName != startName) {
reportSyntaxError("expected closing tag of " + startName)
throw MissingEndTagException
}
xSpaceOpt
xToken('>')
}
/** '<! CharData ::= [CDATA[ ( {char} - {char}"]]>"{char} ) ']]>'
*
* see [15]
*/
/*[Duplicate]*/ def xCharData: Tree = {
xToken('[')
xToken('C')
xToken('D')
xToken('A')
xToken('T')
xToken('A')
xToken('[')
val pos1 = pos
val sb: StringBuilder = new StringBuilder()
while (true) {
if (ch==']' &&
{ sb.append(ch); nextch; ch == ']' } &&
{ sb.append(ch); nextch; ch == '>' }) {
sb.length = sb.length - 2
nextch
return handle.charData(pos1, sb.toString())
} else if (ch == SU)
throw TruncatedXML
else
sb.append(ch)
nextch
}
Predef.error("this cannot happen")
}
def xUnparsed: Tree = {
val pos1 = pos
val sb: StringBuilder = new StringBuilder()
while (true) {
if (ch=='<' &&
{ sb.append(ch); nextch; ch == '/' } &&
{ sb.append(ch); nextch; ch == 'x' } &&
{ sb.append(ch); nextch; ch == 'm' } &&
{ sb.append(ch); nextch; ch == 'l' } &&
{ sb.append(ch); nextch; ch == ':' } &&
{ sb.append(ch); nextch; ch == 'u' } &&
{ sb.append(ch); nextch; ch == 'n' } &&
{ sb.append(ch); nextch; ch == 'p' } &&
{ sb.append(ch); nextch; ch == 'a' } &&
{ sb.append(ch); nextch; ch == 'r' } &&
{ sb.append(ch); nextch; ch == 's' } &&
{ sb.append(ch); nextch; ch == 'e' } &&
{ sb.append(ch); nextch; ch == 'd' } &&
{ sb.append(ch); nextch; ch == '>' }) {
sb.length = sb.length - "</xml:unparsed".length
nextch
return handle.unparsed(pos1, sb.toString())
} else if (ch == SU) {
throw TruncatedXML
} else sb.append(ch)
nextch
}
Predef.error("this cannot happen")
}
/** CharRef ::= "&#" '0'..'9' {'0'..'9'} ";"
* | "&#x" '0'..'9'|'A'..'F'|'a'..'f' { hexdigit } ";"
*
* see [66]
*/
/*[Duplicate]*/ def xCharRef: String = {
val hex = (ch == 'x') && { nextch; true }
val base = if (hex) 16 else 10
var i = 0
while (ch != ';') {
ch match {
case '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' =>
i = i * base + ch.asDigit
case 'a' | 'b' | 'c' | 'd' | 'e' | 'f'
| 'A' | 'B' | 'C' | 'D' | 'E' | 'F' =>
if (!hex)
reportSyntaxError("hex char not allowed in decimal char ref\n"
+"Did you mean to write &#x ?");
else
i = i * base + ch.asDigit
case SU =>
throw TruncatedXML
case _ =>
reportSyntaxError("character '"+ch+"' not allowed in char ref")
}
nextch
}
new String(Array(i.asInstanceOf[Char]))
}
/** Comment ::= '<!--' ((Char - '-') | ('-' (Char - '-')))* '-->'
*
* see [15]
*/
/*[Duplicate]*/ def xComment: Tree = {
val sb: StringBuilder = new StringBuilder()
xToken('-')
xToken('-')
while (true) {
if (ch=='-' && { sb.append(ch); nextch; ch == '-' }) {
sb.length = sb.length - 1
nextch
xToken('>')
return handle.comment(pos, sb.toString())
} else if (ch == SU) {
throw TruncatedXML
} else sb.append(ch)
nextch
}
Predef.error("this cannot happen")
}
/**
* @param pos ...
* @param ts ...
* @param txt ...
*/
/*[Duplicate]*/ def appendText(pos: Position, ts: mutable.Buffer[Tree],
txt: String) {
if (!preserveWS) {
for (t <- TextBuffer.fromString(txt).toText) {
ts.append(handle.text(pos, t.text))
}
}
else
ts.append( handle.text(pos, txt))
}
/** adds entity/character to to ts as side-effect
* @precond ch == '&'
*/
def content_AMP(ts: mutable.ArrayBuffer[Tree]) {
nextch
ch match {
case '#' => // CharacterRef
nextch
val theChar = handle.text(tmppos, xCharRef)
xToken(';')
ts.append(theChar)
case _ => // EntityRef
val n = xName
xToken(';')
ts.append(handle.entityRef(tmppos, n))
}
}
/**
* @precond ch == '{'
* @postcond: xEmbeddedBlock == false!
*/
def content_BRACE(p: Position, ts:mutable.ArrayBuffer[Tree]) {
if (xCheckEmbeddedBlock)
ts.append(xEmbeddedExpr)
else {
appendText(p, ts, xText)/*
val str = new StringBuilder("{")
str.append(xText)
nextch
appendText(p, ts, str.toString())*/
}
}
/** Returns true if it encounters an end tag (without consuming it),
* appends trees to ts as side-effect.
*
* @param ts ...
* @return ...
*/
private def content_LT(ts: mutable.ArrayBuffer[Tree]): Boolean = {
ch match {
case '/' =>
return true // end tag
case '!' =>
nextch // CDATA or Comment
ts.append(if ('[' == ch) xCharData else xComment)
case '?' => // PI
nextch
ts.append(xProcInstr)
case _ =>
ts.append(element) // child node
}
false
}
/*[Duplicate]*/ def content: mutable.Buffer[Tree] = {
var ts = new mutable.ArrayBuffer[Tree]
var exit = false
while (!exit) {
if (xEmbeddedBlock)
ts.append(xEmbeddedExpr)
else {
tmppos = pos
ch match {
case '<' => // end tag, cdata, comment, pi or child node
nextch
exit = content_LT(ts)
case '{' => // either the character '{' or an embedded scala block
content_BRACE(tmppos, ts)
case '&' => // EntityRef or CharRef
content_AMP(ts)
case SU =>
exit = true
case _ => // text content
appendText(tmppos, ts, xText)
// here xEmbeddedBlock might be true
}
}
}
ts
}
/** '<' element ::= xmlTag1 '>' { xmlExpr | '{' simpleExpr '}' } ETag
* | xmlTag1 '/' '>'
*/
/*[Duplicate]*/ def element: Tree = {
val pos1 = pos
val (qname, attrMap) = xTag
if (ch == '/') { // empty element
xToken('/')
xToken('>')
handle.element(pos1, qname, attrMap, new mutable.ListBuffer[Tree])
}
else { // handle content
xToken('>')
if (qname == "xml:unparsed")
return xUnparsed
debugLastStartElement.push((pos1, qname))
val ts = content
xEndTag(qname)
debugLastStartElement.pop
qname match {
case "xml:group" => handle.group(pos1, ts)
case _ => handle.element(pos1, qname, attrMap, ts)
}
}
}
/** actually, Name ::= (Letter | '_' | ':') (NameChar)* but starting with ':' cannot happen
* Name ::= (Letter | '_') (NameChar)*
*
* see [5] of XML 1.0 specification
*
* pre-condition: ch != ':' // assured by definition of XMLSTART token
* post-condition: name does neither start, nor end in ':'
*/
/*[Duplicate]*/ def xName: String = {
if (ch == SU) {
throw TruncatedXML
reportSyntaxError("name expected, but char '"+ch+"' cannot start a name")
return ""
}
val buf = new StringBuilder
do {
buf append nextch
} while (xml.Parsing.isNameChar(ch))
if (':' == buf.last) {
reportSyntaxError( "name cannot end in ':'" )
buf.setLength(buf.length - 1)
}
val n = buf.toString().intern()
//cbuf.length = 0
n
}
/** scan [S] '=' [S]*/
/*[Duplicate]*/ def xEQ = { xSpaceOpt; xToken('='); xSpaceOpt }
/** skip optional space S? */
/*[Duplicate]*/ def xSpaceOpt = { while (xml.Parsing.isSpace(ch)) { nextch }}
/** scan [3] S ::= (#x20 | #x9 | #xD | #xA)+ */
/*[Duplicate]*/ def xSpace =
if (xml.Parsing.isSpace(ch)) { nextch; xSpaceOpt }
else if (ch == SU)
throw TruncatedXML
else reportSyntaxError("whitespace expected")
/** '<?' ProcInstr ::= Name [S ({Char} - ({Char}'>?' {Char})]'?>'
*
* see [15]
*/
/*[Duplicate]*/ def xProcInstr: Tree = {
val sb: StringBuilder = new StringBuilder()
val n = xName
if (xml.Parsing.isSpace(ch)) {
xSpace
while (true) {
if (ch == '?' && { sb.append(ch); nextch; ch == '>' }) {
sb.length = sb.length - 1
nextch
return handle.procInstr(tmppos, n.toString(), sb.toString())
} else
sb.append(ch);
nextch
}
}
xToken('?')
xToken('>')
handle.procInstr(tmppos, n.toString(), sb.toString())
}
/** parse character data.
* precondition: xEmbeddedBlock == false (we are not in a scala block)
*/
/*[Duplicate]*/ def xText: String = {
if (xEmbeddedBlock) Predef.error("internal error: encountered embedded block"); // assert
//Console.println("xText ch now "+ch)
//if( xCheckEmbeddedBlock ) {
// return ""
//} else {
var exit = false
val buf = new StringBuilder
while (!exit && (ch!=SU)) {
buf append ch
val expectRBRACE = ch == '}'
// TODO check for "}}"
nextch
if (expectRBRACE) {
if (ch == '}')
nextch
else {
reportSyntaxError("in XML content, please use '}}' to express '}'")
throw ConfusedAboutBracesException
}
}
exit = xCheckEmbeddedBlock ||(ch == '<') || (ch == '&')
}
val str = buf.toString()
//cbuf.length = 0
str
//}
}
//val cbuf = new StringBuilder()
/** append Unicode character to name buffer*/
//private def putChar(c: char) = cbuf.append(c)
/** xLiteral = element { element }
* @return Scala representation of this xml literal
* precondition: s.xStartsXML == true
*/
def xLiteral: Tree = try {
input = parser.in.flush
handle.isPattern = false
//val pos = s.currentPos
var tree:Tree = null
val ts = new mutable.ArrayBuffer[Tree]()
tmppos = (pos) // Iuli: added this line, as it seems content_LT uses tmppos when creating trees
assert(nextch == '<')
content_LT(ts)
//Console.println("xLiteral:ts = "+ts.toList)
//lastend = s.in.bp
//lastch = s.in.ch
//if (settings.debug.value) {
// Console.println("DEBUG 1: I am getting char '"+ch+"' at lastend "+lastend+" pos = "+pos); // DEBUG
//}
val save = input.offset
xSpaceOpt
// parse more XML ?
if (ch == '<') {
while (ch == '<') {
nextch
ts.append(element)
xSpaceOpt
}
tree = handle.makeXMLseq((pos), ts)
parser.in.resume(Tokens.XMLSTART)
} else {
parser.in.seek(save, Tokens.XMLSTART)
assert(ts.length == 1)
tree = ts(0)
}
tree
} catch {
case c @ TruncatedXML =>
parser.incompleteInputError(c.getMessage)
parser.in.resume(Tokens.XMLSTART)
EmptyTree
case c @ (MissingEndTagException | ConfusedAboutBracesException) =>
parser.syntaxError((debugLastStartElement.top._1):Int,
c.getMessage + debugLastStartElement.top._2+">")
parser.in.resume(Tokens.XMLSTART)
EmptyTree
case _:ArrayIndexOutOfBoundsException =>
parser.syntaxError((debugLastStartElement.top._1),
"missing end tag in XML literal for <"
+debugLastStartElement.top._2+">");
parser.in.resume(Tokens.XMLSTART)
EmptyTree
}
/** @see xmlPattern. resynchronizes after successful parse
* @return this xml pattern
* precondition: s.xStartsXML == true
*/
def xLiteralPattern: Tree = try {
input = parser.in.flush
val oldMode = handle.isPattern;
handle.isPattern = true
assert(nextch == '<')
var tree = xPattern; xSpaceOpt;
handle.isPattern = oldMode;
parser.in.resume(Tokens.XMLSTART)
tree
} catch {
case c @ TruncatedXML =>
parser.syntaxError(pos - 1, c.getMessage)
//s.nextToken
parser.in.resume(Tokens.XMLSTART)
EmptyTree
case c @ (MissingEndTagException | ConfusedAboutBracesException) =>
parser.syntaxError((debugLastStartElement.top._1),
c.getMessage + debugLastStartElement.top._2+">")
EmptyTree
case _:ArrayIndexOutOfBoundsException =>
parser.syntaxError((debugLastStartElement.top._1),
"missing end tag in XML literal for <"
+debugLastStartElement.top._2+">")
EmptyTree
}
def xEmbeddedExpr: Tree = {
xEmbeddedBlock = false
parser.in.resume(LBRACE)
val b = parser.block() //p.expr(true,false);
if (parser.in.token != RBRACE) {
input = parser.in.flush
reportSyntaxError(" expected end of Scala block")
} else {
input = parser.in.flush
assert(nextch == '}')
}
b
}
/** xScalaPatterns ::= patterns
*/
def xScalaPatterns: List[Tree] = {
xEmbeddedBlock = false
parser.in.resume(LBRACE)
val b = parser.patterns(true)
if (parser.in.token != RBRACE) {
input = parser.in.flush
reportSyntaxError(" expected end of Scala pattern")
} else {
input = parser.in.flush
assert(nextch == '}')
}
b
}
//var ch: Char = _;
//def lookahead = { s.xLookahead }
var scannerState: List[List[Int]] = Nil
/*
private def pushScannerState {
scannerState = s.sepRegions :: scannerState
s.sepRegions = Nil
}
private def popScannerState {
s.sepRegions = scannerState.head
scannerState = scannerState.tail
}
*/
/*
private def init {
ch = s.in.ch
pos = s.in.cpos
}
*/
def reportSyntaxError(str: String) = {
parser.syntaxError(pos - 1, "in XML literal: " + str)
nextch
}
/*
private def sync {
xEmbeddedBlock = false
s.xSync
}
*/
/** '<' xPattern ::= Name [S] { xmlPattern | '{' pattern3 '}' } ETag
* | Name [S] '/' '>'
*/
def xPattern: Tree = {
val pos1 = pos
val qname = xName
debugLastStartElement.push((pos1, qname))
xSpaceOpt
if (ch == '/') { // empty tag
nextch
xToken('>')
return handle.makeXMLpat(pos1, qname, new mutable.ArrayBuffer[Tree]())
}
// else: tag with content
xToken('>')
var ts = new mutable.ArrayBuffer[Tree]
var exit = false
while (! exit) {
val pos2 = pos
if (xEmbeddedBlock) {
ts ++= xScalaPatterns
} else
ch match {
case '<' => // tag
nextch
if (ch != '/') { //child
ts.append(xPattern)
} else {
exit = true
}
case '{' => // embedded Scala patterns
while (ch == '{') {
nextch
ts ++= xScalaPatterns
}
// postcond: xEmbeddedBlock = false;
if (xEmbeddedBlock) Predef.error("problem with embedded block"); // assert
case SU =>
throw TruncatedXML
case _ => // teMaxt
appendText(pos2, ts, xText)
// here xEmbeddedBlock might be true;
//if( xEmbeddedBlock ) throw new ApplicationError("after:"+text); // assert
}
}
xEndTag(qname)
debugLastStartElement.pop
handle.makeXMLpat(pos1, qname, ts)
}
} /* class MarkupParser */
}
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