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parser.py
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289 lines (218 loc) · 6.98 KB
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import ply.yacc as yacc
from xpathyylex import tokens, XPathLexer
from parserbackend import *
def p_input(p) :
'input : expr'
p[0] = XPathExpression(p[1])
def p_locationpath(p) :
''' locationpath : relativelocationpath
| absolutelocationpath '''
p[0] = p[1]
def p_absolutelocationpath_root(p) :
''' absolutelocationpath : '/' '''
p[0] = [root()]
def p_absolutelocationpath_path(p) :
''' absolutelocationpath : '/' relativelocationpath '''
p[0] = [root()] + p[2]
def p_absolutelocationpath_abbreviated(p) :
'absolutelocationpath : abbreviatedabsolutelocationpath'
p[0] = p[1]
def p_relativelocationpath_step(p) :
'relativelocationpath : step'
p[0] = [p[1]]
def p_relativelocationpath_stepplus(p) :
''' relativelocationpath : relativelocationpath '/' step '''
p[0] = p[1] + [p[3]]
def p_relativelocationpath_abbreviated(p) :
' relativelocationpath : abreviaterelativelocationpath '
p[0] = p[1]
def p_step_normal(p) :
'step : axisspecifier nodetest predicatelist'
p[0] = step(p[1], p[2], p[3])
def p_step_abbreviated(p) :
'step : abbreviatedstep'
p[0] = p[1]
def p_predicatelist_empty(p) :
'predicatelist : '
p[0] = []
def p_predicatelist_nonempty(p) :
'predicatelist : predicatelist predicate'
p[0] = p[1] + [p[2]]
def p_axisspecifier_a(p) :
' axisspecifier : AXISNAME '
p[0] = axis(p[1])
def p_axisspecifier_b(p) :
' axisspecifier : abbreviatedaxisspecifier '
p[0] = p[1]
def p_nodetest_name(p) :
'nodetest : nametest '
p[0] = nameTest(p[1])
def p_nodetest_function(p) :
''' nodetest : FUNCTIONNAME ')' '''
p[0] = nodeType(p[1])
def p_nodetest_functionarg(p) :
''' nodetest : FUNCTIONNAME LITERAL ')' '''
p[0] = nodeType(p[1], p[2])
def p_predicate(p) :
''' predicate : '[' predicateexpr ']' '''
p[0] = predicate(p[2])
def p_predicateexpr(p) :
''' predicateexpr : expr '''
p[0] = p[1]
def p_abbreviatedabsolutelocationpath(p) :
' abbreviatedabsolutelocationpath : DOUBLESLASH relativelocationpath '
p[0] = [root(), step(axis("descendant-or-self::"), nodeType("node(", 0), [])] + p[2]
def p_abreviaterelativelocationpath(p) :
' abreviaterelativelocationpath : relativelocationpath DOUBLESLASH step '
p[0] = p[1] + [step(axis("descendant-or-self::"), nodeType("node(", 0), []), p[3]]
def p_abbreviatedstep_dot(p) :
''' abbreviatedstep : '.' '''
p[0] = step(axis("self::"), nodeType("node("), [])
def p_abbreviatedstep_doubledot(p) :
' abbreviatedstep : DOUBLEDOT '
p[0] = step(axis("parent::"), nodeType("node("), [])
def p_abbreviatedaxisspecifier_blank(p) :
'abbreviatedaxisspecifier : '
p[0] = axis("child::")
def p_abbreviatedaxisspecifier_at(p) :
'''abbreviatedaxisspecifier : '@' '''
p[0] = axis("attribute::")
def p_expr(p) :
'expr : orexpr'
p[0] = p[1]
def p_primaryexpr_var(p) :
''' primaryexpr : VARIABLEREF '''
p[0] = variableReef(p[1])
def p_primaryexpr_expr(p) :
''' primaryexpr : '(' expr ')' '''
p[0] = p[2]
def p_primaryexpr_literal(p) :
''' primaryexpr : LITERAL '''
p[0] = Literal(p[1])
def p_primaryexpr_number(p) :
''' primaryexpr : NUMBER'''
p[0] = Number(p[1])
def p_primaryexpr_function(p) :
''' primaryexpr : functioncall'''
p[0] = p[1]
def p_functioncall(p) :
''' functioncall : FUNCTIONNAME argumentlist ')' '''
p[0] = function(p[1], p[2])
def p_argumentlist_empty(p) :
''' argumentlist : '''
p[0] = []
def p_argumentlist_one(p) :
''' argumentlist : argument'''
p[0] = [p[1]]
def p_argumentlist_many(p) :
''' argumentlist : argumentlist ',' argument '''
p[0] = p[1] + [p[3]]
def p_argument(p) :
''' argument : expr '''
p[0] = argument(p[1])
def p_unionexpr_path(p) :
''' unionexpr : pathexpr '''
p[0] = p[1]
def p_unionexpr_bar(p) :
''' unionexpr : unionexpr '|' pathexpr '''
p[0] = binaryOperator('|', p[1], p[3])
def p_pathexpr_location(p) :
''' pathexpr : locationpath '''
p[0] = pathExpr(p[1])
def p_pathexpr_filter(p) :
''' pathexpr : filterexpr '''
p[0] = p[1]
#def p_pathexpr_1(p) :
# ''' pathexpr : '''
# p[0] =
#def p_pathexpr_2(p) :
# ''' pathexpr : '''
# p[0] =
def p_filterexpr_one(p):
''' filterexpr : primaryexpr '''
p[0] = p[1]
def p_filterexpr_two(p):
''' filterexpr : primaryexpr predicatelist'''
p[0] = filterExpr(p[1], p[2])
def p_orexpr_a(p):
''' orexpr : andexpr'''
p[0] = p[1]
def p_orexpr_b(p):
''' orexpr : orexpr OR andexpr'''
p[0] = binaryOperator("or", p[1], p[3])
def p_andexpr_a(p):
''' andexpr : equalityexpr'''
p[0] = p[1]
def p_andexpr_b(p):
''' andexpr : andexpr AND equalityexpr'''
p[0] = binaryOperator("and", p[1], p[3])
def p_equalityexpr_a(p):
''' equalityexpr : relationalexpr'''
p[0] = p[1]
def p_equalityexpr_b(p):
''' equalityexpr : equalityexpr '=' relationalexpr'''
p[0] = binaryOperator("=", p[1], p[3])
def p_equalityexpr_c(p):
''' equalityexpr : equalityexpr NEQ relationalexpr'''
p[0] = binaryOperator("!=", p[1], p[3])
def p_relationalexpr_a(p) :
''' relationalexpr : additiveexpr '''
p[0] = p[1]
def p_relationalexpr_b(p) :
''' relationalexpr : relationalexpr '<' additiveexpr '''
p[0] = binaryOperator("<", p[1], p[3])
def p_relationalexpr_c(p) :
''' relationalexpr : relationalexpr '>' additiveexpr '''
p[0] = binaryOperator(">", p[1], p[3])
def p_relationalexpr_d(p) :
''' relationalexpr : relationalexpr LTEQ additiveexpr '''
p[0] = binaryOperator("<=", p[1], p[3])
def p_relationalexpr_e(p) :
''' relationalexpr : relationalexpr GTEQ additiveexpr '''
p[0] = binaryOperator(">=", p[1], p[3])
def p_additiveexpr_a(p) :
''' additiveexpr : multiplicativeexpr '''
p[0] = p[1]
def p_additiveexpr_b(p) :
''' additiveexpr : additiveexpr '+' multiplicativeexpr '''
p[0] = binaryOperator("+", p[1], p[3])
def p_additiveexpr_c(p) :
''' additiveexpr : additiveexpr '-' multiplicativeexpr '''
p[0] = binaryOperator("-", p[1], p[3])
def p_multiplicativeexpr_a(p) :
''' multiplicativeexpr : unaryexpr '''
p[0] = p[1]
def p_multiplicativeexpr_b(p) :
''' multiplicativeexpr : multiplicativeexpr MUL unaryexpr '''
p[0] = binaryOperator("*", p[1], p[3])
def p_multiplicativeexpr_c(p) :
''' multiplicativeexpr : multiplicativeexpr DIV unaryexpr '''
p[0] = binaryOperator("div", p[1], p[3])
def p_multiplicativeexpr_d(p) :
''' multiplicativeexpr : multiplicativeexpr MOD unaryexpr '''
p[0] = binaryOperator("mod", p[1], p[3])
def p_unaryexpr_a(p) :
''' unaryexpr : unionexpr '''
p[0] = p[1]
def p_unaryexpr_b(p) :
''' unaryexpr : '-' unaryexpr '''
p[0] = negative(p[2])
def p_nametest_a(p) :
''' nametest : '*' '''
p[0] = '*'
def p_nametest_b(p) :
''' nametest : NCNAME ':' '*' '''
p[0] = [p[1], p[2], p[3]]
def p_nametest_c(p) :
''' nametest : qname'''
p[0] = p[1]
def p_qname_a(p) :
''' qname : NCNAME ':' NCNAME '''
p[0] = p[1] + ':' + p[3]
def p_qname_b(p) :
''' qname : NCNAME '''
p[0] = p[1]
def parse(expression) :
parser = yacc.yacc()
lexer = XPathLexer()
return parser.parse(expression, lexer=lexer)