org.eclipse.ocl.lpg
Class AbstractParser

java.lang.Object
  org.eclipse.ocl.lpg.AbstractParser

Direct Known Subclasses:

AbstractOCLParser

public abstract class AbstractParser
extends java.lang.Object

The AbstractParser supports syntactic analysis of a tokens produced by an AbstractLexer to create a corresponding CST, that may in turn be exploited by an AbstractAnalyzer to create an AST. Derived classes should extend the abstract support for AST from CST from tokens from text parsing and analysis to support the AST and CST classes appropriate to a particular language.

Constructor Summary

AbstractParser(AbstractLexer lexer)

AbstractParser(BasicEnvironment environment)

Method Summary

java.lang.String	computeInputString(int left, int right) Returns a single line string representation of the input chars for the given range.
protected char	decodeEscapeSequence(java.text.StringCharacterIterator i) Decodes an escape sequence in accordance with the Issue 14357 proposals for Concrete Syntaxes.
protected int	decodeHexCharacter(char c) Return the value of the next character if it is a hexadecimal character.
protected int	decodeOctalCharacter(java.text.StringCharacterIterator i) Return the value of the next character if it is an octal character.
protected java.lang.String	decodeString(lpg.runtime.IToken token, java.lang.String string) Returns a string with any escape sequences decoded by decodeEscapeSequence(java.text.StringCharacterIterator).
int	getDefaultRepairCount()
BasicEnvironment	getEnvironment()
abstract DerivedPrsStream	getIPrsStream()
protected abstract lpg.runtime.IToken	getLeftIToken()
protected abstract int	getLeftSpan()
AbstractLexer	getLexer()
abstract lpg.runtime.ParseTable	getParseTable()
protected abstract lpg.runtime.ErrorToken	getRhsErrorIToken(int i)
protected abstract int	getRhsErrorTokenIndex(int i)
protected abstract lpg.runtime.IToken	getRhsFirstIToken(int i)
protected abstract int	getRhsFirstTokenIndex(int i)
protected abstract lpg.runtime.IToken	getRhsIToken(int i)
protected abstract lpg.runtime.IToken	getRhsLastIToken(int i)
protected abstract int	getRhsLastTokenIndex(int i)
protected abstract java.lang.Object	getRhsSym(int i)
protected abstract int	getRhsTokenIndex(int i)
protected abstract lpg.runtime.IToken	getRightIToken()
protected abstract int	getRightSpan()
abstract int	numTokenKinds()
abstract java.lang.String[]	orderedTerminalSymbols()
abstract CSTNode	parser() Runs the parser with the current lex and parse streams
abstract CSTNode	parser(int error_repair_count) Runs the parser with the current lex and parse streams using a given error_repair_count (useful for a backtracking parser)
abstract CSTNode	parser(lpg.runtime.Monitor monitor) Runs the parser with the current lex and parse streams using the given Monitor
abstract CSTNode	parser(lpg.runtime.Monitor monitor, int error_repair_count) Runs the parser with the current lex and parse streams using the given Monitor and error_repair_count (useful for a backtracking parser)
CSTNode	parseTokensToCST() Deprecated. clients should invoke parser()
abstract void	reset(lpg.runtime.ILexStream lexStream) Resets the parser's lexStream
void	resetLexStream(lpg.runtime.LexStream lexStream) Deprecated. To set/reset the lex stream use reset(ILexStream)
void	setDefaultRepairCount(int defaultRepairCount) Sets the number of repairs to be performed by a parser capable of performing repairs (the BacktrackingParser) unless overridden on the specific parser invocation method.
void	setLexStream(AbstractLexer lexer) Deprecated. To set/reset the lex stream use reset(ILexStream)
protected void	setOffsets(CSTNode cstNode) Initializes a concrete-syntax node's start and end offsets from the current token in the parser stream.
protected void	setOffsets(CSTNode cstNode, CSTNode startEnd) Sets the start and end offsets of the given CSTNode to the start and end offsets of the 2nd given CSTNode
protected void	setOffsets(CSTNode cstNode, CSTNode start, CSTNode end) Sets the start and end offsets of the given CSTNode to the start offset of the 2nd given CSTNode and the end offset of the 3rd given CSTNode
protected void	setOffsets(CSTNode cstNode, CSTNode start, lpg.runtime.IToken end) Sets the start and end offsets of the given CSTNode to the start offset of the 2nd given CSTNode and the end offset of the given IToken
protected void	setOffsets(CSTNode cstNode, lpg.runtime.IToken startEnd) Sets the start and end offsets of the given CSTNode to the start and end offsets of the given IToken
protected void	setOffsets(CSTNode cstNode, lpg.runtime.IToken start, CSTNode end) Sets the start and end offsets of the given CSTNode to the start offset of the given IToken and the end offset of the 2nd given CSTNode
protected void	setOffsets(CSTNode cstNode, lpg.runtime.IToken start, lpg.runtime.IToken end) Sets the start and end offsets of the given CSTNode to the start offset of the 1std given IToken and the end offset of the 2nd given IToken
protected abstract void	setResult(java.lang.Object object)
protected java.lang.String	unDoubleQuote(lpg.runtime.IToken token) Deprecated. double quotes form no part of the OCL specification
protected java.lang.String	unquote(java.lang.String quoted) Deprecated. Use unDoubleQuote
protected java.lang.String	unSingleQuote(lpg.runtime.IToken token) Removes any quotes surrounding the string value of a token using #unSingleQuote(String,int) and optionally decode any escape sequences within it using decodeEscapeSequence(java.text.StringCharacterIterator).
protected java.lang.String	unSingleQuote(java.lang.String quoted) Removes any quotes surrounding a quoted string.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractParser

public AbstractParser(BasicEnvironment environment)

AbstractParser

public AbstractParser(AbstractLexer lexer)

Method Detail

computeInputString

public java.lang.String computeInputString(int left,
                                           int right)

Returns a single line string representation of the input chars for the given range.

Parameters:

left - left most char index

right - right most char index

Returns:

a single line string representation of the input chars

getEnvironment

public BasicEnvironment getEnvironment()

getDefaultRepairCount

public int getDefaultRepairCount()

Since:

1.3

getLexer

public AbstractLexer getLexer()

parseTokensToCST

@Deprecated
public CSTNode parseTokensToCST()

Deprecated. clients should invoke parser()

resetLexStream

@Deprecated
public void resetLexStream(lpg.runtime.LexStream lexStream)

Deprecated. To set/reset the lex stream use reset(ILexStream)

Parameters:

lexStream -

setDefaultRepairCount

public void setDefaultRepairCount(int defaultRepairCount)

Sets the number of repairs to be performed by a parser capable of performing repairs (the BacktrackingParser) unless overridden on the specific parser invocation method. When repair count is 0, no Error token recoveries occur. When repair count is > 0, it limits the number of Error token recoveries. When repair count is < 0, the number of error token recoveries is unlimited.

Parameters:

defaultRepairCount - the default repair count

Since:

1.3

setLexStream

@Deprecated
public void setLexStream(AbstractLexer lexer)

Deprecated. To set/reset the lex stream use reset(ILexStream)

Parameters:

lexer -

setOffsets

protected void setOffsets(CSTNode cstNode,
                          lpg.runtime.IToken startEnd)

Sets the start and end offsets of the given CSTNode to the start and end offsets of the given IToken

Parameters:

cstNode - CSTNode to set offsets

startEnd - IToken to retrieve offsets from

setOffsets

protected void setOffsets(CSTNode cstNode,
                          CSTNode startEnd)

Sets the start and end offsets of the given CSTNode to the start and end offsets of the 2nd given CSTNode

Parameters:

cstNode - CSTNode to set offsets

startEnd - CSTNode to retrieve offsets from

setOffsets

protected void setOffsets(CSTNode cstNode,
                          CSTNode start,
                          CSTNode end)

Sets the start and end offsets of the given CSTNode to the start offset of the 2nd given CSTNode and the end offset of the 3rd given CSTNode

Parameters:

cstNode - CSTNode to set offsets

start - CSTNode to retrieve start offset from

end - CSTNode to retrieve end offset from

setOffsets

protected void setOffsets(CSTNode cstNode,
                          CSTNode start,
                          lpg.runtime.IToken end)

Sets the start and end offsets of the given CSTNode to the start offset of the 2nd given CSTNode and the end offset of the given IToken

Parameters:

cstNode - CSTNode to set offsets

start - CSTNode to retrieve start offset from

end - IToken to retrieve end offset from

setOffsets

protected void setOffsets(CSTNode cstNode,
                          lpg.runtime.IToken start,
                          CSTNode end)

Sets the start and end offsets of the given CSTNode to the start offset of the given IToken and the end offset of the 2nd given CSTNode

Parameters:

cstNode - CSTNode to set offsets

start - IToken to retrieve start offset from

end - CSTNode to retrieve end offset from

setOffsets

protected void setOffsets(CSTNode cstNode,
                          lpg.runtime.IToken start,
                          lpg.runtime.IToken end)

Sets the start and end offsets of the given CSTNode to the start offset of the 1std given IToken and the end offset of the 2nd given IToken

Parameters:

cstNode - CSTNode to set offsets

start - IToken to retrieve start offset from

end - IToken to retrieve end offset from

setOffsets

protected void setOffsets(CSTNode cstNode)

Initializes a concrete-syntax node's start and end offsets from the current token in the parser stream.

Note: this method resided in the OCLEssential.g template since 1.2 It has been incorporated in the abstract parser since 3.0

Parameters:

cstNode - a concrete-syntax node

Since:

3.0

unquote

@Deprecated
protected java.lang.String unquote(java.lang.String quoted)

Deprecated. Use unDoubleQuote

Removes the "s surrounding a quoted string, if any.

Parameters:

quoted - a possibly quoted string

Returns:

quoted without the surrounding quotes, or just quoted verbatim if there were none

unDoubleQuote

@Deprecated
protected java.lang.String unDoubleQuote(lpg.runtime.IToken token)

Deprecated. double quotes form no part of the OCL specification

Removes any "s surrounding a quoted string and decodes any escape sequences within it using decodeEscapeSequence(java.text.StringCharacterIterator).

For MDT/OCL 1.3.0 compatibility, a problem is reported if double quotes are present and the #ProblemOption.ELEMENT_NAME_QUOTE_ESCAPE severity is not #ProblemHandler.Severity.OK.

Parameters:

token - containing string to be decoded

Returns:

string value of token with escapes replaced

Since:

3.0

unSingleQuote

protected java.lang.String unSingleQuote(lpg.runtime.IToken token)

Removes any quotes surrounding the string value of a token using #unSingleQuote(String,int) and optionally decode any escape sequences within it using decodeEscapeSequence(java.text.StringCharacterIterator).

For MDT/OCL 1.3.0 compatibility, escape sequences conversion can be disabled by resetting #ParsingOption.USE_BACKSLASH_ESCAPE_PROCESSING.

Parameters:

token - containing string to be decoded

Returns:

string value of token with escapes replaced

Since:

3.0

unSingleQuote

protected java.lang.String unSingleQuote(java.lang.String quoted)

Removes any quotes surrounding a quoted string.

The default implementation removes a leading/trailing single quote pair, or an underscore-prefixed leading/trailing single quote pair.

Parameters:

quoted - string to be decoded

Returns:

string content

Since:

3.0

decodeString

protected java.lang.String decodeString(lpg.runtime.IToken token,
                                        java.lang.String string)

Returns a string with any escape sequences decoded by decodeEscapeSequence(java.text.StringCharacterIterator).

Parameters:

token - the token from which the string originated

string - to be decoded

Returns:

string without any escapes replaced

Since:

3.0

decodeEscapeSequence

protected char decodeEscapeSequence(java.text.StringCharacterIterator i)

Decodes an escape sequence in accordance with the Issue 14357 proposals for Concrete Syntaxes. For compatibility octal escape sequences are also supported.

\b	: backspace BS
\t	: horizontal tab HT
\n	: line feed LF
\f	: form feed FF
\r	: carriage return CR
\"	": double quote "
\'	': single quote '
\\	\: backslash \
\xhh	\u00hh: hex byte
\uhhhh	\uhhhh: hex code point
\7$	\u000o: octal byte
\77	\u00ff: octal byte
\37$	\u00ff: octal byte
\377	\u00ff: octal byte
h	hex digit (0-9, a-f, A-F)
7	octal digit (0-7)
3	octal prefix digit (0-3)
$	end of string or non-octal digit next letter

Parameters:

i - character iterator pointing at first character after the introducer

Returns:

the decoded character and i updated to point to the first character following the escape sequence, or DONE and i unchanged if the escape sequence is unrecognised

Since:

3.0

decodeHexCharacter

protected int decodeHexCharacter(char c)

Return the value of the next character if it is a hexadecimal character.

Parameters:

c - potentially hex character

Returns:

the hex value or -1 if the next character is not a hex character

Since:

3.0

decodeOctalCharacter

protected int decodeOctalCharacter(java.text.StringCharacterIterator i)

Return the value of the next character if it is an octal character.

Parameters:

c - potentially octal character

Returns:

the hex value or -1 if the next character is not a octal character

Since:

3.0

orderedTerminalSymbols

public abstract java.lang.String[] orderedTerminalSymbols()

numTokenKinds

public abstract int numTokenKinds()

Returns:

the number of different parser tokens

Since:

3.0

getIPrsStream

public abstract DerivedPrsStream getIPrsStream()

Returns:

the parser's parseStream

Since:

3.0

reset

public abstract void reset(lpg.runtime.ILexStream lexStream)

Resets the parser's lexStream

Parameters:

lexStream -

Since:

3.0

parser

public abstract CSTNode parser()

Runs the parser with the current lex and parse streams

Returns:

the root CSTNode which results from the parsing process

Since:

3.0

parser

public abstract CSTNode parser(lpg.runtime.Monitor monitor)

Runs the parser with the current lex and parse streams using the given Monitor

Returns:

the root CSTNode which results from the parsing process

Since:

3.0

parser

public abstract CSTNode parser(int error_repair_count)

Runs the parser with the current lex and parse streams using a given error_repair_count (useful for a backtracking parser)

Returns:

the root CSTNode which results from the parsing process

Since:

3.0

parser

public abstract CSTNode parser(lpg.runtime.Monitor monitor,
                               int error_repair_count)

Runs the parser with the current lex and parse streams using the given Monitor and error_repair_count (useful for a backtracking parser)

Returns:

the root CSTNode which results from the parsing process

Since:

3.0

getParseTable

public abstract lpg.runtime.ParseTable getParseTable()

Returns:

the ParseTable used by the parser

Since:

3.0

getRhsSym

protected abstract java.lang.Object getRhsSym(int i)

Since:

3.0

getRhsTokenIndex

protected abstract int getRhsTokenIndex(int i)

Since:

3.0

getRhsIToken

protected abstract lpg.runtime.IToken getRhsIToken(int i)

Since:

3.0

getRhsFirstTokenIndex

protected abstract int getRhsFirstTokenIndex(int i)

Since:

3.0

getRhsFirstIToken

protected abstract lpg.runtime.IToken getRhsFirstIToken(int i)

Since:

3.0

getRhsLastTokenIndex

protected abstract int getRhsLastTokenIndex(int i)

Since:

3.0

getRhsLastIToken

protected abstract lpg.runtime.IToken getRhsLastIToken(int i)

Since:

3.0

getLeftSpan

protected abstract int getLeftSpan()

Since:

3.0

getLeftIToken

protected abstract lpg.runtime.IToken getLeftIToken()

Since:

3.0

getRightSpan

protected abstract int getRightSpan()

Since:

3.0

getRightIToken

protected abstract lpg.runtime.IToken getRightIToken()

Since:

3.0

getRhsErrorTokenIndex

protected abstract int getRhsErrorTokenIndex(int i)

Since:

3.0

getRhsErrorIToken

protected abstract lpg.runtime.ErrorToken getRhsErrorIToken(int i)

Since:

3.0

setResult

protected abstract void setResult(java.lang.Object object)

Since:

3.0