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Parser.py

#!/usr/bin/env python
# $Id: Parser.py,v 1.70 2005/04/26 20:49:01 tavis_rudd Exp $
"""Parser classes for Cheetah's Compiler

Classes:
  ParseError( Exception )
  _LowLevelParser( Cheetah.SourceReader.SourceReader )
  _HighLevelParser( _LowLevelParser )
  Parser === _HighLevelParser (an alias)

Meta-Data
================================================================================
Author: Tavis Rudd <tavis@damnsimple.com>
Version: $Revision: 1.70 $
Start Date: 2001/08/01
Last Revision Date: $Date: 2005/04/26 20:49:01 $
"""
__author__ = "Tavis Rudd <tavis@damnsimple.com>"
__revision__ = "$Revision: 1.70 $"[11:-2]

import os
import sys
import re
from re import DOTALL, MULTILINE
from types import StringType, ListType, TupleType
import time
from tokenize import pseudoprog
import inspect

from Cheetah.SourceReader import SourceReader
from Cheetah import Filters
from Cheetah import ErrorCatchers

# re tools
def escapeRegexChars(txt,
                     escapeRE=re.compile(r'([\$\^\*\+\.\?\{\}\[\]\(\)\|\\])')):
    
    """Return a txt with all special regular expressions chars escaped."""
    
    return escapeRE.sub(r'\\\1' , txt)

def group(*choices): return '(' + '|'.join(choices) + ')'
def nongroup(*choices): return '(?:' + '|'.join(choices) + ')'
def namedGroup(name, *choices): return '(P:<' + name +'>' + '|'.join(choices) + ')'
def any(*choices): return apply(group, choices) + '*'
def maybe(*choices): return apply(group, choices) + '?'

##################################################
## CONSTANTS & GLOBALS ##

NO_CACHE = 0
STATIC_CACHE = 1
REFRESH_CACHE = 2

##################################################
## Tokens for the parser ##

#generic
identchars = "abcdefghijklmnopqrstuvwxyz" \
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ_"
namechars = identchars + "0123456789"

#operators
powerOp = '**'
unaryArithOps = ('+', '-', '~')
binaryArithOps = ('+', '-', '/', '//','%')
shiftOps = ('>>','<<')
bitwiseOps = ('&','|','^')
assignOp = '='
augAssignOps = ('+=','-=','/=','*=', '**=','^=','%=',
          '>>=','<<=','&=','|=', )
assignmentOps = (assignOp,) + augAssignOps

compOps = ('<','>','==','!=','<=','>=', '<>', 'is', 'in',)
booleanOps = ('and','or','not')
operators = (powerOp,) + unaryArithOps + binaryArithOps \
            + shiftOps + bitwiseOps + assignmentOps \
            + compOps + booleanOps

delimeters = ('(',')','{','}','[',']',
              ',','.',':',';','=','`') + augAssignOps


keywords = ('and',       'del',       'for',       'is',        'raise',    
            'assert',    'elif',      'from',      'lambda',    'return',   
            'break',     'else',      'global',    'not',       'try',      
            'class',     'except',    'if',        'or',        'while',    
            'continue',  'exec',      'import',    'pass',
            'def',       'finally',   'in',        'print',
            )

single3 = "'''"
double3 = '"""'

tripleQuotedStringStarts =  ("'''", '"""', 
                             "r'''", 'r"""', "R'''", 'R"""',
                             "u'''", 'u"""', "U'''", 'U"""',
                             "ur'''", 'ur"""', "Ur'''", 'Ur"""',
                             "uR'''", 'uR"""', "UR'''", 'UR"""')

tripleQuotedStringPairs = {"'''": single3, '"""': double3,
                           "r'''": single3, 'r"""': double3,
                           "u'''": single3, 'u"""': double3,
                           "ur'''": single3, 'ur"""': double3,
                           "R'''": single3, 'R"""': double3,
                           "U'''": single3, 'U"""': double3,
                           "uR'''": single3, 'uR"""': double3,
                           "Ur'''": single3, 'Ur"""': double3,
                           "UR'''": single3, 'UR"""': double3,
                           }

closurePairs= {')':'(',']':'[','}':'{'}
closurePairsRev= {'(':')','[':']','{':'}'}

##################################################
## Regex chunks for the parser ##

tripleQuotedStringREs = {}
def makeTripleQuoteRe(start, end):
    start = escapeRegexChars(start)
    end = escapeRegexChars(end)
    return re.compile(r'(?:' + start + r').*?' + r'(?:' + end + r')', re.DOTALL)

for start, end in tripleQuotedStringPairs.items():
    tripleQuotedStringREs[start] = makeTripleQuoteRe(start, end)

WS = r'[ \f\t]*'  
EOL = r'\r\n|\n|\r'
EOLZ = EOL + r'|\Z'
escCharLookBehind = nongroup(r'(?<=\A)',r'(?<!\\)')
nameCharLookAhead = r'(?=[A-Za-z_])'


specialVarRE=re.compile(r'([a-zA-z_]+)@') # for matching specialVar comments
EOLre=re.compile(r'(?:\r\n|\r|\n)')

# e.g. ##author@ Tavis Rudd

##################################################
## CLASSES ##

class ParseError(ValueError):
    def __init__(self, stream, msg='Invalid Syntax', extMsg=''):
        self.stream = stream
        if stream.pos() >= len(stream):
            stream.setPos(len(stream) -1)
        self.msg = msg
        self.extMsg = extMsg
        
    def __str__(self):
        return self.report()

    def report(self):
        stream = self.stream
        if stream.filename():
            f = " in file %s" % stream.filename()
        else:
            f = ''
        report = ''
        row, col, line = self.stream.getRowColLine()


        ## get the surrounding lines
        lines = stream.splitlines()
        prevLines = []                  # (rowNum, content)
        for i in range(1,4):
            if row-1-i <=0:
                break
            prevLines.append( (row-i,lines[row-1-i]) )

        nextLines = []                  # (rowNum, content)
        for i in range(1,4):
            if not row-1+i < len(lines):
                break
            nextLines.append( (row+i,lines[row-1+i]) )
        nextLines.reverse()
        
        ## print the main message
        report += "\n\n%s at line %i, column %i%s\n\n" % (self.msg, row, col, f)
        report += 'Line|Line contents\n'
        report += '----|-------------------------------------------------------------\n'
        while prevLines:
            lineInfo = prevLines.pop()
            report += "%(row)-4d|%(line)s\n"% {'row':lineInfo[0], 'line':lineInfo[1]}
        report += "%(row)-4d|%(line)s\n"% {'row':row, 'line':line}
        report += ' '*5 +' '*(col-1) + "^\n"
        
        while nextLines:
            lineInfo = nextLines.pop()
            report += "%(row)-4d|%(line)s\n"% {'row':lineInfo[0], 'line':lineInfo[1]}
        ## add the extra msg
        if self.extMsg:
            report += self.extMsg + '\n'
            
        return report

class CheetahVariable:
    def __init__(self, nameChunks, useNameMapper=True, cacheToken=None,
                 rawSource=None):
        self.nameChunks = nameChunks
        self.useNameMapper = useNameMapper
        self.cacheToken = cacheToken
        self.rawSource = rawSource
        
class Placeholder(CheetahVariable): pass

class ArgList:
    """Used by _LowLevelParser.getArgList()"""

    def __init__(self):
        self.argNames = []
        self.defVals = []
        self.i = 0

    def addArgName(self, name):
        self.argNames.append( name )
        self.defVals.append( None )

    def next(self):
        self.i += 1

    def addToDefVal(self, token):
        i = self.i
        if self.defVals[i] == None:
            self.defVals[i] = ''
        self.defVals[i] += token
    
    def merge(self):
        defVals = self.defVals
        for i in range(len(defVals)):
            if type(defVals[i]) == StringType:
                defVals[i] = defVals[i].strip()
                
        return map(None, [i.strip() for i in self.argNames], defVals)
    
    def __str__(self):
        return str(self.merge())
    
class _LowLevelParser(SourceReader):
    """This class implements the methods to match or extract ('get*') the basic
    elements of Cheetah's grammar.  It does NOT handle any code generation or
    state management.
    """

    _settingsManager = None

    def setSettingsManager(self, settingsManager):
        self._settingsManager = settingsManager
        
    def setting(self, key): 
        return self._settingsManager.setting(key)
        
    def setSetting(self, key, val):
        self._settingsManager.setSetting(key, val)
        
    def updateSettings(self, settings):
        self._settingsManager.updateSettings(settings)

    def _initializeSettings(self): 
        self._settingsManager._initializeSettings()
    
    def configureParser(self):
        """Is called by the Compiler instance after the parser has had a
        settingsManager assigned with self.setSettingsManager() 
        """
        self._makeCheetahVarREs()
        self._makeCommentREs()
        self._makeDirectiveREs()
        self._makePspREs()
        self._possibleNonStrConstantChars = (
            self.setting('commentStartToken')[0] +
            self.setting('multiLineCommentStartToken')[0] + 
            self.setting('cheetahVarStartToken')[0] +
            self.setting('directiveStartToken')[0] +
            self.setting('PSPStartToken')[0])
        self._nonStrConstMatchers = [
            self.matchCommentStartToken,
            self.matchMultiLineCommentStartToken,
            self.matchCheetahVarStart,
            self.isDirective,
            self.matchPSPStartToken
            ]

    ## regex setup ##

    def _makeCheetahVarREs(self):
        
        """Setup the regexs for Cheetah $var parsing."""

        num = r'[0-9\.]+'
        interval =   (r'(?P<interval>' + 
                      num + r's|' +
                      num + r'm|' +
                      num + r'h|' +
                      num + r'd|' +
                      num + r'w|' +
                      num + ')' 
                      )
    
        cacheToken = (r'(?:' +
                      r'(?P<REFRESH_CACHE>\*' + interval + '\*)'+
                      '|' +
                      r'(?P<STATIC_CACHE>\*)' +
                      '|' +
                      r'(?P<NO_CACHE>)' +
                      ')')
        self.cacheTokenRE = re.compile(cacheToken)
        
        self.cheetahVarStartRE = re.compile(
            escCharLookBehind +
            r'(?P<startToken>' +
            escapeRegexChars(self.setting('cheetahVarStartToken')) +
            ')' +
            r'(?P<cacheToken>' +
            cacheToken +
            ')' +
            r'(?P<enclosure>|(?:(?:\{|\(|\[)[ \t\f]*))' + # allow WS after enclosure
            r'(?=[A-Za-z_])')
        validCharsLookAhead = r'(?=[A-Za-z_\*!\{\(\[])'
        self.cheetahVarStartToken = self.setting('cheetahVarStartToken')
        self.cheetahVarStartTokenRE = re.compile(
            escCharLookBehind +
            escapeRegexChars(self.setting('cheetahVarStartToken')) +
            validCharsLookAhead)

    def _makeCommentREs(self):
        """Construct the regex bits that are used in comment parsing."""
        
        startTokenEsc = escapeRegexChars(self.setting('commentStartToken'))
        self.commentStartTokenRE = re.compile(escCharLookBehind + startTokenEsc)
        del startTokenEsc
        
        startTokenEsc = escapeRegexChars(
            self.setting('multiLineCommentStartToken'))
        endTokenEsc = escapeRegexChars(
            self.setting('multiLineCommentEndToken'))
        self.multiLineCommentTokenStartRE = re.compile(escCharLookBehind +
                                                       startTokenEsc)
        self.multiLineCommentEndTokenRE = re.compile(escCharLookBehind +
                                                     endTokenEsc)
        
    def _makeDirectiveREs(self):
        
        """Construct the regexs that are used in directive parsing."""
        
        startToken = self.setting('directiveStartToken')
        endToken = self.setting('directiveEndToken')
        startTokenEsc = escapeRegexChars(startToken)
        endTokenEsc = escapeRegexChars(endToken)
        
        validSecondCharsLookAhead = r'(?=[A-Za-z_])'
        self.directiveStartTokenRE = re.compile(escCharLookBehind + startTokenEsc
                                                + validSecondCharsLookAhead)
        self.directiveEndTokenRE = re.compile(escCharLookBehind + endTokenEsc)

    def _makePspREs(self):
        
        """Setup the regexs for PSP parsing."""
        
        startToken = self.setting('PSPStartToken')
        startTokenEsc = escapeRegexChars(startToken)
        self.PSPStartTokenRE = re.compile(escCharLookBehind + startTokenEsc)
        
        endToken = self.setting('PSPEndToken')
        endTokenEsc = escapeRegexChars(endToken)
        self.PSPEndTokenRE = re.compile(escCharLookBehind + endTokenEsc)


    def matchPyToken(self):
        match = pseudoprog.match(self.src(), self.pos())
        
        if match and match.group() in tripleQuotedStringStarts:
            TQSmatch = tripleQuotedStringREs[match.group()].match(self.src(), self.pos())
            if TQSmatch:
                return TQSmatch
        return match
        
    def getPyToken(self):
        match = self.matchPyToken()
        if match is None:
            from Parser import ParseError
            raise ParseError(self)
        elif match.group() in tripleQuotedStringStarts:
            from Parser import ParseError
            raise ParseError(self, msg='Malformed triple-quoted string')
        return self.readTo(match.end())

    def matchNonStrConst(self):
        if self.peek() in self._possibleNonStrConstantChars:
            for matcher in self._nonStrConstMatchers:
                if matcher():
                    return True
        return False

    def matchCommentStartToken(self):
        return self.commentStartTokenRE.match(self.src(), self.pos())
    
    def getCommentStartToken(self):
        match = self.matchCommentStartToken()
        if not match:
            raise ParseError(self, msg='Invalid single-line comment start token')
        return self.readTo(match.end())

    def matchMultiLineCommentStartToken(self):
        return self.multiLineCommentTokenStartRE.match(self.src(), self.pos())
    
    def getMultiLineCommentStartToken(self):
        match = self.matchMultiLineCommentStartToken()
        if not match:
            raise ParseError(self, msg='Invalid multi-line comment start token')
        return self.readTo(match.end())

    def matchMultiLineCommentEndToken(self):
        return self.multiLineCommentEndTokenRE.match(self.src(), self.pos())
    
    def getMultiLineCommentEndToken(self):
        match = self.matchMultiLineCommentEndToken()
        if not match:
            raise ParseError(self, msg='Invalid multi-line comment end token')
        return self.readTo(match.end())

    def isLineClearToStartToken(self, pos=None):
        if pos == None:
            pos = self.pos()
        self.checkPos(pos)            
        src = self.src()
        BOL = self.findBOL()
        return BOL == pos or src[BOL:pos].isspace()

    def matchWhiteSpace(self, WSchars=' \f\t'):
        return (not self.atEnd()) and  self.peek() in WSchars

    def getWhiteSpace(self, WSchars=' \f\t'):
        if not self.matchWhiteSpace(WSchars):
            return ''
        start = self.pos()
        while self.pos() < self.breakPoint():
            self.advance()
            if not self.matchWhiteSpace(WSchars):
                break
        return self.src()[start:self.pos()]

    def matchNonWhiteSpace(self, WSchars=' \f\t\n\r'):
        return self.atEnd() or not self.peek() in WSchars

    def getNonWhiteSpace(self, WSchars=' \f\t\n\r'):
        if not self.matchNonWhiteSpace(WSchars):
            return ''
        start = self.pos()
        while self.pos() < self.breakPoint():
            self.advance()
            if not self.matchNonWhiteSpace(WSchars):
                break
        return self.src()[start:self.pos()]
    
    def getDottedName(self):
        srcLen = len(self)
        nameChunks = []
        
        if not self.peek() in identchars:
            raise ParseError(self)
    
        while self.pos() < srcLen:
            c = self.peek()
            if c in namechars:
                nameChunk = self.getIdentifier()
                nameChunks.append(nameChunk)
            elif c == '.':
                if self.pos()+1 <srcLen and self.peek(1) in identchars:
                    nameChunks.append(self.getc())
                else:
                    break
            else:
                break

        return ''.join(nameChunks)

    def matchIdentifier(self,
                     identRE=re.compile(r'[a-zA-Z_][a-zA-Z_0-9]*')):
        return identRE.match(self.src(), self.pos())
    
    def getIdentifier(self):
        match = self.matchIdentifier()
        if not match:
            raise ParseError(self, msg='Invalid identifier')
        return self.readTo(match.end())

    def matchOperator(self):
        match = self.matchPyToken()
        if match and match.group() not in operators:
            match = None
        return match

    def getOperator(self):
        match = self.matchOperator()
        if not match:
            raise ParseError(self, msg='Expected operator')
        return self.readTo( match.end() )

    def matchAssignmentOperator(self):
        match = self.matchPyToken()
        if match and match.group() not in assignmentOps:
            match = None
        return match
        
    def getAssignmentOperator(self):
        match = self.matchAssignmentOperator()
        if not match:
            raise ParseError(self, msg='Expected assignment operator')
        return self.readTo( match.end() )

    def isDirective(self, directiveKeyChars=identchars+'-'):
        startPos = self.pos()
        if not self.matchDirectiveStartToken():
            return False

        self.getDirectiveStartToken()
        directiveKey = ''
        while self.pos() < self.breakPoint():
            c = self.getc()
            if not c in directiveKeyChars:
                break
            directiveKey += c
            
        if not directiveKey in self._directiveEaters.keys():
            directiveKey= False
        self.setPos(startPos)
        # DEBUG: print directiveKey, self.src()
        return directiveKey        
            
    def matchDirectiveStartToken(self):
        return self.directiveStartTokenRE.match(self.src(), self.pos())
    
    def getDirectiveStartToken(self):
        match = self.matchDirectiveStartToken()
        if not match:
            raise ParseError(self, msg='Invalid directive start token')
        return self.readTo(match.end())

    def matchDirectiveEndToken(self):
        return self.directiveEndTokenRE.match(self.src(), self.pos())
    
    def getDirectiveEndToken(self):
        match = self.matchDirectiveEndToken()
        if not match:
            raise ParseError(self, msg='Invalid directive end token')
        return self.readTo(match.end())

    def matchPSPStartToken(self):
        return self.PSPStartTokenRE.match(self.src(), self.pos())

    def matchPSPEndToken(self):
        return self.PSPEndTokenRE.match(self.src(), self.pos())

    def getPSPStartToken(self):
        match = self.matchPSPStartToken()
        if not match:
            raise ParseError(self, msg='Invalid psp start token')
        return self.readTo(match.end())

    def getPSPEndToken(self):
        match = self.matchPSPEndToken()
        if not match:
            raise ParseError(self, msg='Invalid psp end token')
        return self.readTo(match.end())

    def matchCheetahVarStart(self):
        """includes the enclosure and cache token"""
        return self.cheetahVarStartRE.match(self.src(), self.pos())
        
    def getCheetahVarStartToken(self):
        """just the start token, not the enclosure or cache token"""
        match = self.matchCheetahVarStart()
        if not match:
            raise ParseError(self, msg='Expected Cheetah $var start token')            
        return self.readTo( match.end('startToken') )

    def getCacheToken(self):
        try:
            token = self.cacheTokenRE.match(self.src(), self.pos())
            self.setPos( token.end() )
            return token.group()
        except:
            raise ParseError(self, msg='Expected cache token')


    def getTargetVarsList(self):
        varnames = []
        while not self.atEnd():
            if self.peek() in ' \t\f':
                self.getWhiteSpace()
            elif self.peek() in '\r\n':
                break
            elif self.startswith(','):
                self.advance()
            elif self.startswith('in ') or self.startswith('in\t'):
                break
            elif self.matchCheetahVarStart():
                self.getCheetahVarStartToken()
                self.getCacheToken()
                varnames.append( self.getDottedName() )
            elif self.matchIdentifier():
                varnames.append( self.getDottedName() )
            else:
                break
        return varnames
        
    def getCheetahVar(self, plain=False, skipStartToken=False):
        """discards the cache info"""
        if not skipStartToken:
            self.getCheetahVarStartToken()
        self.getCacheToken()
        return self.getCheetahVarBody(plain=plain)

    def _getCheetahVar(self, plain=False, skipStartToken=False):
        # @@TR: refactoring in progress
        if not skipStartToken:
            self.getCheetahVarStartToken()
        cacheToken = self.getCacheToken()
        return CheetahVariable(nameChunks=self.getCheetahVarNameChunks(),
                               cacheToken=cacheToken,
                               useNameMapper=plain
                               )
            
    def getCheetahVarBody(self, plain=False):
        # @@TR: this should be in the compiler
        return self._compiler.genCheetahVar(self.getCheetahVarNameChunks(), plain=plain)
        
    def getCheetahVarNameChunks(self):
        
        """
        nameChunks = list of Cheetah $var subcomponents represented as tuples
          [ (namemapperPart,autoCall,restOfName),
          ]
        where:
          namemapperPart = the dottedName base
          autocall = where NameMapper should use autocalling on namemapperPart
          restOfName = any arglist, index, or slice

        If restOfName contains a call arglist (e.g. '(1234)') then autocall is
        False, otherwise it defaults to True.

        EXAMPLE
        ------------------------------------------------------------------------

        if the raw CheetahVar is
          $a.b.c[1].d().x.y.z
          
        nameChunks is the list
          [ ('a.b.c',True,'[1]'),
            ('d',False,'()'),     
            ('x.y.z',True,''),   
          ]

        """

        chunks = []
        while self.pos() < len(self):
            rest = ''
            autoCall = True
            if not self.peek() in identchars + '.':
                break
            elif self.peek() == '.':
                
                if self.pos()+1 < len(self) and self.peek(1) in identchars:
                    self.advance()  # discard the period as it isn't needed with NameMapper
                else:
                    break
                
            dottedName = self.getDottedName()
            if not self.atEnd() and self.peek() in '([':
                if self.peek() == '(':
                    rest = self.getCallArgString()
                else:
                    rest = self.getExpression(enclosed=True)
                
                period = max(dottedName.rfind('.'), 0)
                if period:
                    chunks.append( (dottedName[:period], autoCall, '') )
                    dottedName = dottedName[period+1:]
                if rest and rest[0]=='(':
                    autoCall = False
            chunks.append( (dottedName, autoCall, rest) )

        return chunks
    

    def getCallArgString(self,
                         enclosures=[],  # list of tuples (char, pos), where char is ({ or [ 
                         ):

        """ Get a method/function call argument string. 

        This method understands *arg, and **kw
        """
        
        if enclosures:
            pass
        else:
            if not self.peek() == '(':
                raise ParseError(self, msg="Expected '('")
            startPos = self.pos()
            self.getc()
            enclosures = [('(', startPos),
                          ]
        
        argStringBits = ['(']
        addBit = argStringBits.append

        while 1:
            if self.atEnd():
                open = enclosures[-1][0]
                close = closurePairsRev[open]
                self.setPos(enclosures[-1][1])
                raise ParseError(
                    self, msg="EOF was reached before a matching '" + close +
                    "' was found for the '" + open + "'")

            c = self.peek()
            if c in ")}]": # get the ending enclosure and break                
                if not enclosures:
                    raise ParseError(self)
                c = self.getc()
                open = closurePairs[c]
                if enclosures[-1][0] == open:
                    enclosures.pop()
                    addBit(')')  
                    break
                else:
                    raise ParseError(self)
            elif c in " \t\f\r\n":
                addBit(self.getc())
            elif self.matchCheetahVarStart():
                startPos = self.pos()
                codeFor1stToken = self.getCheetahVar()
                WS = self.getWhiteSpace()
                if not self.atEnd() and self.peek() == '=':
                    nextToken = self.getPyToken()
                    if nextToken == '=':
                        endPos = self.pos()
                        self.setPos(startPos)
                        codeFor1stToken = self.getCheetahVar(plain=True)
                        self.setPos(endPos)
                        
                    ## finally
                    addBit( codeFor1stToken + WS + nextToken )
                else:
                    addBit( codeFor1stToken + WS)
            else:
                token = self.getPyToken()
                if token in ('{','(','['):
                    self.rev()
                    token = self.getExpression(enclosed=True)
                addBit(token)

        return ''.join(argStringBits)
    
    def getDefArgList(self, exitPos=None, useNameMapper=False):

        """ Get an argument list. Can be used for method/function definition
        argument lists or for #directive argument lists. Returns a list of
        tuples in the form (argName, defVal=None) with one tuple for each arg
        name.

        These defVals are always strings, so (argName, defVal=None) is safe even
        with a case like (arg1, arg2=None, arg3=1234*2), which would be returned as
        [('arg1', None),
         ('arg2', 'None'),
         ('arg3', '1234*2'),         
        ]

        This method understands *arg, and **kw

        """

        if self.peek() == '(':
            self.advance()
        else:
            exitPos = self.findEOL()  # it's a directive so break at the EOL
        argList = ArgList()
        onDefVal = False

        # @@TR: this settings mangling should be removed
        useNameMapper_orig = self.setting('useNameMapper')
        self.setSetting('useNameMapper', useNameMapper)

        while 1:
            if self.atEnd():
                self.setPos(enclosures[-1][1])
                raise ParseError(
                    self, msg="EOF was reached before a matching ')'"+
                    " was found for the '('")

            if self.pos() == exitPos:
                break

            c = self.peek()
            if c == ")" or self.matchDirectiveEndToken():
                break
            elif c in " \t\f\r\n":
                if onDefVal:
                    argList.addToDefVal(c)
                self.advance()
            elif c == '=':
                onDefVal = True
                self.advance()
            elif c == ",":
                argList.next()
                onDefVal = False
                self.advance()
            elif self.startswith(self.cheetahVarStartToken) and not onDefVal:
                self.advance(len(self.cheetahVarStartToken))
            elif self.matchIdentifier() and not onDefVal:
                argList.addArgName( self.getIdentifier() )
            elif onDefVal:
                if self.matchCheetahVarStart():
                    token = self.getCheetahVar()
                else:
                    token = self.getPyToken()
                    if token in ('{','(','['):
                        self.rev()
                        token = self.getExpression(enclosed=True)
                argList.addToDefVal(token)
            elif c == '*' and not onDefVal:
                varName = self.getc()
                if self.peek() == '*':
                    varName += self.getc()
                if not self.matchIdentifier():
                    raise ParseError(self)
                varName += self.getIdentifier()
                argList.addArgName(varName)
            else:
                raise ParseError(self)

                
        self.setSetting('useNameMapper', useNameMapper_orig) # @@TR: see comment above
        return argList.merge()
    
    def getExpressionParts(self,
                           enclosed=False, 
                           enclosures=None, # list of tuples (char, pos), where char is ({ or [ 
                           ):

        """ Get a Cheetah expression that includes $CheetahVars and break at
        directive end tokens."""

        if enclosures is None:
            enclosures = []
        
        srcLen = len(self)
        exprBits = []
        while 1:
            if self.atEnd():
                if enclosures:
                    open = enclosures[-1][0]
                    close = closurePairsRev[open]
                    self.setPos(enclosures[-1][1])
                    raise ParseError(
                        self, msg="EOF was reached before a matching '" + close +
                        "' was found for the '" + open + "'")
                else:
                    break

            c = self.peek()
            
            if c in "{([":
                exprBits.append(c)
                enclosures.append( (c, self.pos()) )
                self.advance()
                
            elif enclosed and not enclosures:
                break
                
            elif c in "])}":
                if not enclosures:
                    raise ParseError(self)
                open = closurePairs[c]
                if enclosures[-1][0] == open:
                    enclosures.pop()
                    exprBits.append(c)
                else:
                    open = enclosures[-1][0]
                    close = closurePairsRev[open]
                    row, col = self.getRowCol()
                    self.setPos(enclosures[-1][1])
                    raise ParseError(
                        self, msg= "A '" + c + "' was found at line " + str(row) +
                        ", col " + str(col) +
                        " before a matching '" + close +
                        "' was found\nfor the '" + open + "'")
                self.advance()
                                
            elif c in " \f\t":
                exprBits.append(self.getWhiteSpace())
            
            elif self.matchDirectiveEndToken() and not enclosures:
                break
            
            elif c == "\\" and self.pos()+1 < srcLen:
                eolMatch = EOLre.match(self.src(), self.pos()+1)
                if not eolMatch:
                    self.advance()
                    raise ParseError(self, msg='Line ending expected')
                self.setPos( eolMatch.end() )
            elif c in '\r\n':
                if enclosures:
                    self.advance()                    
                else:
                    break
                
            elif self.matchIdentifier():
                token = self.getIdentifier()
                exprBits.append(token)
                if token == 'for':
                    targetVars = self.getTargetVarsList()
                    exprBits.append(' ' + ', '.join(targetVars) + ' ')
                else:
                    exprBits.append(self.getWhiteSpace())
                    if not self.atEnd() and self.peek() == '(':
                        exprBits.append(self.getCallArgString())
                    
            elif self.matchCheetahVarStart():
                token = self.getCheetahVar()
                exprBits.append(token)
            else:
                token = self.getPyToken()
                exprBits.append(token)                    
                                        
        return exprBits

    def getExpression(self,*args, **kws):
        """Returns the output of self.getExpressionParts() as a concatenated
        string rather than as a list.
        """
        return ''.join(self.getExpressionParts(*args, **kws))

class _HighLevelParser(_LowLevelParser):
    """This class is a StateMachine for parsing Cheetah source and
    sending state dependent code generation commands to
    Cheetah.Compiler.Compiler.
    """
    def __init__(self, src, filename=None, breakPoint=None, compiler=None):
        SourceReader.__init__(self, src, filename=filename, breakPoint=breakPoint)
        self.setSettingsManager(compiler)
        self._compiler = compiler
        self.configureParser()
        self.initDirectives()
        self.setupState()

        #self._reader = SourceReader(src, filename=filename, breakPoint=breakPoint)
        #for k, v in inspect.getmembers(self._reader, inspect.ismethod):
        #    setattr(self, k, v)

    def setupState(self):
        self._indentStack = []
            
    def initDirectives(self):
        self._directiveEaters = {

            # importing and inheritance
            'import':self.eatImport,
            'from':self.eatImport,
            'extends': self.eatExtends,
            'implements': self.eatImplements,

            # output, filtering, and caching
            'slurp': self.eatSlurp,
            'raw': self.eatRaw,
            'include': self.eatInclude,
            'cache': self.eatCache,
            'filter': self.eatFilter,
            'echo': self.eatEcho,
            'silent': self.eatSilent,

            # declaration, assignment, and deletion
            'attr':self.eatAttr,
            'def': self.eatDef,
            'block': self.eatBlock,
            'set': self.eatSet,
            'del': self.eatDel,
            
            # flow control
            'while': self.eatWhile,
            'for': self.eatFor,
            'if': self.eatIf,
            'else': self.eatElse,
            'elif': self.eatElse,
            'pass': self.eatPass,
            'break': self.eatBreak,
            'continue': self.eatContinue,
            'stop': self.eatStop,
            'return': self.eatReturn,

            # little wrappers
            'repeat': self.eatRepeat,
            'unless': self.eatUnless,

            # error handling
            'assert': self.eatAssert,
            'raise': self.eatRaise,
            'try': self.eatTry,
            'except': self.eatExcept,
            'finally': self.eatFinally,
            'errorCatcher':self.eatErrorCatcher,

            # intructions to the parser and compiler
            'breakpoint':self.eatBreakPoint,
            'compiler':self.eatCompiler,            
            'compiler-settings':self.eatCompilerSettings,
            
            # misc
            'shBang': self.eatShbang,
            'encoding': self.eatEncoding,
            
            'end': self.eatEndDirective,
            }

        
        self._directiveEndEaters = {
            'def': self.eatEndDef,
            'block': self.eatEndBlock,
            
            'cache': self.eatEndCache,
            'filter': self.eatEndFilter,
            'errorCatcher':self.eatEndErrorCatcher,
            
            'while': self.eatEndWhile,
            'for': self.eatEndFor,
            'if': self.eatEndIf,
            'try': self.eatEndTry,
            
            'repeat': self.eatEndRepeat,
            'unless': self.eatEndUnless,
            
            }
        self._indentingDirectives = ['def','block',
                                    'if','for','while',
                                    'try',
                                    'repeat','unless']
    ## main parse loop

    def parse(self):
        while not self.atEnd():
            if self.matchCommentStartToken():
                self.eatComment()
            elif self.matchMultiLineCommentStartToken():
                self.eatMultiLineComment()
            elif self.matchCheetahVarStart():
                self.eatPlaceholder()
            elif self.isDirective():
                self.eatDirective()
            elif self.matchPSPStartToken():
                self.eatPSP()
            else:
                self.eatStrConstant()
        self.assertEmptyIndentStack()
                
    ## eat methods    
                
    def eatStrConstant(self):
        startPos = self.pos()
        while not self.atEnd():
            if self.matchNonStrConst():
                break
            else:
                self.advance()
        strConst = self.readTo(self.pos(), start=startPos)
        self._compiler.addStrConst(strConst)

    def eatComment(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        if isLineClearToStartToken:
            self._compiler.handleWSBeforeDirective()
        self.getCommentStartToken()            
        comm = self.readToEOL(gobble=isLineClearToStartToken)
        self._compiler.addComment(comm)

    def eatMultiLineComment(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()

        self.getMultiLineCommentStartToken()
        endPos = startPos = self.pos()
        level = 1
        while 1:
            endPos = self.pos()
            if self.atEnd():
                break
            if self.matchMultiLineCommentStartToken():
                self.getMultiLineCommentStartToken()
                level += 1
            elif self.matchMultiLineCommentEndToken():
                self.getMultiLineCommentEndToken()
                level -= 1
            if not level:
                break
            self.advance()
        comm = self.readTo(endPos, start=startPos)
        if not self.atEnd():
            self.getMultiLineCommentEndToken()
        # don't gobble
        self._compiler.addComment(comm)

    def eatPlaceholder(self):
        # @@TR: this method implements some code that should be delegated to the
        # compiler: the cache and error catcher stuff

        startPos = self.pos()
        startToken = self.getCheetahVarStartToken()
        cacheToken = self.getCacheToken()
        
        cacheInfo = self._compiler.genCacheInfo(cacheToken)
        
        if self.peek() in '({[':
            pos = self.pos()
            enclosures = [ (self.getc(), pos) ]
            self.getWhiteSpace()
        else:
            enclosures = []
        nameChunks = self.getCheetahVarNameChunks()
        if enclosures:
            restOfEnclosure = self.getCallArgString(enclosures=enclosures,
                                                    )[1:-1]
        else:
            restOfEnclosure = ''

        rawPlaceholder = self[startPos: self.pos()]
        lineCol = self.getRowCol(startPos)
        
        codeChunk  = self._compiler.genCheetahVar(nameChunks)

        ## deal with the cache
        if cacheInfo:
            cacheInfo['ID'] = repr(rawPlaceholder)[1:-1]
            self._compiler.startCacheRegion(cacheInfo, lineCol)
            
        if self._compiler.isErrorCatcherOn():            
            methodName = self._compiler.addErrorCatcherCall(codeChunk,
                                                  rawCode=rawPlaceholder,
                                                  lineCol=lineCol
                                                  )
            codeChunk = 'self.' + methodName + '(localsDict=locals())'

        self._compiler.addFilteredChunk( codeChunk + restOfEnclosure, rawPlaceholder)
        if self.setting('outputRowColComments'):
            self._compiler.appendToPrevChunk(' # from line %s, col %s' % lineCol + '.')
        if cacheInfo:
            self._compiler.endCacheRegion()

    def eatPSP(self):
        self.getPSPStartToken()
        endToken = self.setting('PSPEndToken')
        startPos = self.pos()            
        while not self.atEnd():
            if self.peek() == endToken[0]:
                if self.matchPSPEndToken():
                    break
            self.advance()
        pspString = self.readTo(self.pos(), start=startPos).strip()
        self._compiler.addPSP(pspString)
        self.getPSPEndToken()


    ## generic directive eat methods

    def eatDirective(self):
        directiveKey = self.isDirective()
        self._directiveEaters[directiveKey]()

    def _eatRestOfDirectiveTag(self, isLineClearToStartToken, endOfFirstLinePos):
        if self.matchDirectiveEndToken():
            self.getDirectiveEndToken()
        elif isLineClearToStartToken and (not self.atEnd()) and self.peek() in '\r\n':
            self.readToEOL(gobble=True)
            
        if isLineClearToStartToken and (self.atEnd() or self.pos() > endOfFirstLinePos):
            self._compiler.handleWSBeforeDirective() #command to the compiler

    def eatEndDirective(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        self.getDirectiveStartToken()
        self.advance(3)                 # to end of 'end'
        self.getWhiteSpace()
        pos = self.pos()
        directiveKey = False
        for key in self._directiveEndEaters.keys():
            if self.find(key, pos) == pos:
                directiveKey = key
                break
        if not directiveKey:
            raise ParseError(self, msg='Invalid end directive')
                    
        self._directiveEndEaters[directiveKey](
            isLineClearToStartToken=isLineClearToStartToken)


    def _eatToThisEndDirective(self, directiveKey):
        finalPos = endRawPos = startPos = self.pos()
        directiveChar = self.setting('directiveStartToken')[0]
        isLineClearToStartToken = False
        while not self.atEnd():
            if self.peek() == directiveChar:
                if self.isDirective() == 'end':
                    endRawPos = self.pos()
                    self.getDirectiveStartToken()
                    self.advance(3)                 # to end of 'end'
                    self.getWhiteSpace()
                    if self.startswith(directiveKey):
                        if self.isLineClearToStartToken(endRawPos):
                            isLineClearToStartToken = True
                            endRawPos = self.findBOL(endRawPos)
                        self.advance(len(directiveKey)) # to end of directiveKey
                        self.getWhiteSpace()
                        finalPos = self.pos()
                        break
            self.advance()
            finalPos = endRawPos = self.pos()

        textEaten = self.readTo(endRawPos, start=startPos)
        self.setPos(finalPos)
        
        endOfFirstLinePos = self.findEOL()
        
        if self.matchDirectiveEndToken():
            self.getDirectiveEndToken()
        elif isLineClearToStartToken and (not self.atEnd()) and self.peek() in '\r\n':
            self.readToEOL(gobble=True)
            
        if isLineClearToStartToken and self.pos() > endOfFirstLinePos:
            self._compiler.handleWSBeforeDirective()
        return textEaten

    def eatSimpleExprDirective(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()
        self.getDirectiveStartToken()
        
        expr = self.getExpression().strip()
        directiveKey = expr.split()[0]
        if directiveKey in self._indentingDirectives:
            self.pushToIndentStack(directiveKey)
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)
        return expr

    ## specific directive eat methods
    
    def eatBreakPoint(self):
        self.setBreakPoint(self.pos())

    def eatShbang(self):
        self.getDirectiveStartToken()
        self.advance(len('shBang'))
        self.getWhiteSpace()
        shBang = self.readToEOL()
        self.setShBang(shBang.strip())

    def eatEncoding(self):
        self.getDirectiveStartToken()
        self.advance(len('encoding'))
        self.getWhiteSpace()
        encoding = self.readToEOL()
        self._compiler.setModuleEncoding(encoding.strip())
        
    def eatCompiler(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()
        startPos = self.pos()
        self.getDirectiveStartToken()
        self.advance(len('compiler'))   # to end of 'compiler'
        self.getWhiteSpace()
               
        settingName = self.getIdentifier()

        if settingName.lower() == 'reset':
            self.getExpression() # gobble whitespace & junk
            self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)
            self._initializeSettings()
            self.configureParser()
            return
        
        self.getWhiteSpace()
        if self.peek() == '=':
            self.advance()
        else:
            raise ParserError(self)
        valueExpr = self.getExpression()
        endPos = self.pos()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)
        try:
            self._compiler.setCompilerSetting(settingName, valueExpr)
        except:
            out = sys.stderr
            print >> out, 'An error occurred while processing the following #compiler directive.'
            print >> out, '-'*80
            print >> out, self[startPos:endPos]
            print >> out, '-'*80
            print >> out, 'Please check the syntax of these settings.'
            print >> out, 'A full Python exception traceback follows.'
            raise


    def eatCompilerSettings(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('compiler-settings'))   # to end of 'settings'
        
        keywords = self.getTargetVarsList()
        self.getExpression()            # gobble any garbage
            
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)

        if 'reset' in keywords:
            self._compiler._initializeSettings()
            self.configureParser()
            # @@TR: this implies a single-line #compiler-settings directive, and
            # thus we should parse forward for an end directive.
            # Subject to change in the future
            return 
        
        settingsStr = self._eatToThisEndDirective('compiler-settings')            
        
        try:
            self._compiler.setCompilerSettings(keywords=keywords, settingsStr=settingsStr)
        except:
            out = sys.stderr
            print >> out, 'An error occurred while processing the following compiler settings.'
            print >> out, '-'*80
            print >> out, settingsStr.strip()
            print >> out, '-'*80
            print >> out, 'Please check the syntax of these settings.'
            print >> out, 'A full Python exception traceback follows.'
            raise


    def eatAttr(self):       
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        startPos = self.pos()
        self.getDirectiveStartToken()
        self.advance(len('attr'))
        self.getWhiteSpace()
        
        if self.matchCheetahVarStart():
            self.getCheetahVarStartToken()
        attribName = self.getIdentifier()
        self.getWhiteSpace()
        self.getAssignmentOperator()
        expr = self.getExpression()
        self._compiler.addAttribute(attribName, expr)
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)

    def eatDef(self):
        self._eatDefOrBlock('def')
        
    def _eatDefOrBlock(self, directiveKey):
        assert directiveKey in ('def','block')
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        startPos = self.pos()
        self.getDirectiveStartToken()
        self.advance(len(directiveKey))
        self.getWhiteSpace()
        if self.matchCheetahVarStart():
            self.getCheetahVarStartToken()
        methodName = self.getIdentifier()
        self.getWhiteSpace()
        if self.peek() == '(':
            argsList = self.getDefArgList()
            self.advance()              # past the closing ')'
            if argsList and argsList[0][0] == 'self':
                del argsList[0]
        else:
            argsList=[]

        def includeBlockMarkers():
            if self.setting('includeBlockMarkers'):
                startMarker = self.setting('blockMarkerStart')
                self._compiler.addStrConst(startMarker[0] + methodName + startMarker[1])

        if self.peek() == ':':
            self.getc()
            rawSignature = self._eatSingleLineDef(methodName, argsList, startPos, endOfFirstLinePos)
            if directiveKey == 'def':
                #@@TR: must come before _eatRestOfDirectiveTag ... for some reason
                self._compiler.closeDef()
            else:
                includeBlockMarkers()
                self._compiler.closeBlock()
                
            self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        else:
            self.pushToIndentStack(directiveKey)
            rawSignature = self._eatMultiLineDef(methodName,
                                                 argsList, startPos, isLineClearToStartToken)
            if directiveKey == 'block':
                includeBlockMarkers()

        return methodName, rawSignature
            
    def _eatSingleLineDef(self, methodName, argsList, startPos, endPos):
        origPos = self.pos()
        methodSrc = self[self.pos():endPos].strip()
        fullSignature = self[startPos:endPos]
        origBP = self.breakPoint()
        origSrc = self.src()
        self._src = methodSrc
        self.setPos(0)
        self.setBreakPoint(len(methodSrc))

        parserComment = ('Generated from ' + fullSignature + 
                         ' at line %s, col %s' % self.getRowCol(startPos)
                         + '.')
        self._compiler.startMethodDef(methodName, argsList, parserComment)

        self.parse()
        self.getWhiteSpace()
        self._src = origSrc
        self.setBreakPoint(origBP) 
        self.setPos(endPos)
        
        return fullSignature # used by the #block code


    def ____eatSingleLineDef(self, methodName, argsList, startPos, endPos):
        ## @@TR: refactoring in progress
        origPos = self.pos()
        methodSrc = self[self.pos():endPos].strip()
        fullSignature = self[startPos:endPos]

        print
        print '@@@@:', self.pos(), endPos, endPos-self.pos(), len(methodSrc), self.pos()+len(methodSrc)

        origBP = self.breakPoint()
        origSrc = self.src()
        #self._src = methodSrc
        #self.setPos(0)
        #self.setBreakPoint(len(methodSrc))
        self.getWhiteSpace()
        self.setBreakPoint(endPos-1)
        print '-%s-'%self[self.pos():self._breakPoint]
        print '-%s-'%methodSrc

        parserComment = ('Generated from ' + signature + 
                         ' at line %s, col %s' % self.getRowCol(startPos)
                         + '.')
        self._compiler.startMethodDef(methodName, argsList, parserComment)
        self.parse()
        self.getWhiteSpace()
        print self.pos(),'&&&&&&'
        print 
        #self._src = origSrc
        self.setBreakPoint(origBP) 
        self.setPos(endPos)
        
        return fullSignature # used by the #block code
        
    def _eatMultiLineDef(self, methodName, argsList, startPos, isLineClearToStartToken=False):
        rawDef = self[startPos:self.pos()]
        self.getExpression()            # slurp up any garbage left at the end
        signature = self[startPos:self.pos()]
        endOfFirstLinePos = self.findEOL()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        parserComment = ('Generated from ' + signature + 
                         ' at line %s, col %s' % self.getRowCol(startPos)
                         + '.')
        self._compiler.startMethodDef(methodName, argsList, parserComment)
        return methodName, rawDef

    def eatBlock(self):
        startPos = self.pos()
        methodName, rawSignature = self._eatDefOrBlock('block')
        self._compiler._blockMetaData[methodName] = {
            'raw':rawSignature,
            'lineCol':self.getRowCol(startPos),
            }
            
    def eatImport(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()
        self.getDirectiveStartToken()
        impStatement = self.getExpression()
        self._compiler.addImportStatement(impStatement)
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)
    
    def eatExtends(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('extends'))
        self.getWhiteSpace()
        self._compiler.setBaseClass(self.getDottedName()) # in compiler
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)
            
    def eatImplements(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('implements'))
        self.getWhiteSpace()
        self._compiler.setMainMethodName(self.getIdentifier())
        self.getExpression()  # throw away and unwanted crap that got added in
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)

    def eatSilent(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('silent'))
        self.getWhiteSpace()
        expr = self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.addSilent(expr)

    def eatEcho(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('echo'))
        self.getWhiteSpace()
        expr = self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.addFilteredChunk(expr, rawExpr=expr)

    def eatSet(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()

        self.getDirectiveStartToken()
        self.advance(3)
        self.getWhiteSpace()
        if self.startswith('local'):
            self.getIdentifier()
            self.getWhiteSpace()
            isGlobal = False
        elif self.startswith('global'):
            self.getIdentifier()
            self.getWhiteSpace()
            isGlobal = True
        else:
            isGlobal = False

        LVALUE = self.getCheetahVar(plain=True,
                                    skipStartToken=(not self.matchCheetahVarStart()))
        self.getWhiteSpace()
        OP = self.getAssignmentOperator()
        RVALUE = self.getExpression()
        
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)
        self._compiler.addSet(LVALUE, OP, RVALUE, isGlobal)
    
    def eatSlurp(self):
        if self.isLineClearToStartToken():
            self._compiler.handleWSBeforeDirective()
        self._compiler.commitStrConst()
        self.readToEOL(gobble=True)

    def eatRaw(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        self.getDirectiveStartToken()
        self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        rawBlock = self._eatToThisEndDirective('raw')
        self._compiler.addRawText(rawBlock)
    
    def eatInclude(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('include'))

        self.getWhiteSpace()
        includeFrom = 'file'
        isRaw = False
        if self.startswith('raw'):
            self.advance(3)
            isRaw=True
            
        self.getWhiteSpace()            
        if self.startswith('source'):
            self.advance(len('source'))
            includeFrom = 'str'
            self.getWhiteSpace()
            if not self.peek() == '=':
                raise ParseError(self)
            self.advance()
            
        sourceExpr = self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.addInclude(sourceExpr, includeFrom, isRaw)

    def eatCache(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        lineCol = self.getRowCol()
        self.getDirectiveStartToken()
        self.advance(len('cache'))
        startPos = self.pos()
        argList = self.getDefArgList(useNameMapper=True)
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        cacheInfo = self._compiler.genCacheInfoFromArgList(argList)
        self._compiler.startCacheRegion(cacheInfo, lineCol)


    def eatFilter(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()

        self.getDirectiveStartToken()
        self.advance(len('filter'))
        self.getWhiteSpace()
        
        if self.matchCheetahVarStart():
            isKlass = True
            theFilter = self.getExpression()
        else:
            isKlass = False
            theFilter = self.getIdentifier()
            self.getWhiteSpace()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.setFilter(theFilter, isKlass)
        
    def eatErrorCatcher(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('errorCatcher'))
        self.getWhiteSpace()
        self._compiler.turnErrorCatcherOn()
        errorCatcherName = self.getIdentifier()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.setErrorCatcher(errorCatcherName)
        
    def eatWhile(self):
        self._compiler.addWhile(self.eatSimpleExprDirective())

    def eatFor(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()

        self.getDirectiveStartToken()
        expr = self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self.pushToIndentStack("for")
        self._compiler.addFor(expr)
        
    def eatIf(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLine = self.findEOL()
        self.getDirectiveStartToken()
        expressionParts = self.getExpressionParts()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLine)
        expr = ''.join(expressionParts).strip()
        oneLiner = ('then' in expressionParts and 'else' in expressionParts)
        if oneLiner:
            conditionExpr = []
            trueExpr = []
            falseExpr = []
            currentExpr = conditionExpr
            for part in expressionParts:
                if part.strip()=='then':
                    currentExpr = trueExpr
                elif part.strip()=='else':
                    currentExpr = falseExpr
                else:
                    currentExpr.append(part)
                    
            conditionExpr = ''.join(conditionExpr)
            trueExpr = ''.join(trueExpr)
            falseExpr = ''.join(falseExpr)
            self._compiler.addOneLineIf(conditionExpr, trueExpr, falseExpr)
        else:
            self.pushToIndentStack('if')
            self._compiler.addIf(expr)
    
    def eatElse(self):
        """else, elif and else if"""
        self._compiler.addElse(self.eatSimpleExprDirective())

    def eatTry(self):
        self._compiler.addTry(self.eatSimpleExprDirective())

    def eatExcept(self):
        self._compiler.addExcept(self.eatSimpleExprDirective())

    def eatFinally(self):
        self._compiler.addFinally(self.eatSimpleExprDirective())

    def eatPass(self):
        self._compiler.addChunk(self.eatSimpleExprDirective())

    def eatDel(self):
        self._compiler.addChunk(self.eatSimpleExprDirective())

    def eatAssert(self):
        self._compiler.addChunk(self.eatSimpleExprDirective())

    def eatRaise(self):
        self._compiler.addChunk(self.eatSimpleExprDirective())

    def eatBreak(self):
        self._compiler.addChunk(self.eatSimpleExprDirective())

    def eatContinue(self):
        self._compiler.addChunk(self.eatSimpleExprDirective())

    def eatStop(self):
        self._compiler.addStop(self.eatSimpleExprDirective())

    def eatReturn(self):
        self._compiler.addReturn(self.eatSimpleExprDirective())

    def eatRepeat(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('repeat'))
        expr = self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self.pushToIndentStack("repeat")
        self._compiler.addRepeat(expr)


    def eatUnless(self):
        isLineClearToStartToken = self.isLineClearToStartToken()
        endOfFirstLinePos = self.findEOL()
        self.getDirectiveStartToken()
        self.advance(len('unless'))
        expr = self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self.pushToIndentStack("unless")
        self._compiler.addUnless(expr)
        
    ## end directive eaters

    def eatEndDef(self, isLineClearToStartToken=False):
        endOfFirstLinePos = self.findEOL()
        self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self.popFromIndentStack("def")
        self._compiler.closeDef()
        
    def eatEndBlock(self, isLineClearToStartToken=False):
        endOfFirstLinePos = self.findEOL()
        self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self.popFromIndentStack("block")
        self._compiler.closeBlock()


    def eatEndCache(self, isLineClearToStartToken=False):
        endOfFirstLinePos = self.findEOL()
        self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.endCacheRegion()

    def eatEndFilter(self, isLineClearToStartToken=False):
        endOfFirstLinePos = self.findEOL()
        self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.addChunk('filter = self._initialFilter')        

    def eatEndErrorCatcher(self, isLineClearToStartToken=False):
        endOfFirstLinePos = self.findEOL()
        self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self.turnErrorCatcherOff()

    def eatDedentDirective(self, directiveKey, isLineClearToStartToken=False):        
        endOfFirstLinePos = self.findEOL()
        self.getExpression()
        self._eatRestOfDirectiveTag(isLineClearToStartToken, endOfFirstLinePos)
        self._compiler.commitStrConst()            
        self._compiler.dedent()
        assert directiveKey in self._indentingDirectives
        self.popFromIndentStack(directiveKey)

    def eatEndWhile(self, isLineClearToStartToken=False):
        self.eatDedentDirective('while', isLineClearToStartToken)

    def eatEndIf(self, isLineClearToStartToken=False):
        self.eatDedentDirective('if', isLineClearToStartToken)

    def eatEndFor(self, isLineClearToStartToken=False):
        self.eatDedentDirective('for', isLineClearToStartToken)

    def eatEndTry(self, isLineClearToStartToken=False):
        self.eatDedentDirective('try', isLineClearToStartToken)

    def eatEndRepeat(self, isLineClearToStartToken=False):
        self.eatDedentDirective('repeat', isLineClearToStartToken)

    def eatEndUnless(self, isLineClearToStartToken=False):
        self.eatDedentDirective('unless', isLineClearToStartToken)

    ###

    def pushToIndentStack(self, directiveKey):
        assert directiveKey in self._indentingDirectives
        self._indentStack.append(directiveKey)

    def popFromIndentStack(self, directiveKey):
        if not self._indentStack:
            raise ParseError(self, msg="#end found, but nothing to end")
        
        if self._indentStack[-1] == directiveKey:
            del self._indentStack[-1]
        else:
            raise ParseError(self, msg="#end %s found, expected #end %s" %(
                directiveKey, self._indentStack[-1]))

    def assertEmptyIndentStack(self):
        if self._indentStack:
            raise ParseError(
                self,
                msg="Parsing claims it's done, items remaining on stack: %s" %(
                ", ".join(self._indentStack)))


##################################################
## Make an alias to export
    
Parser = _HighLevelParser

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