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Commit 618eef32 authored by Eckhart Arnold's avatar Eckhart Arnold
Browse files

- Arithmetic example extended

parent 44c61528
......@@ -18,9 +18,9 @@
#
#######################################################################
expression = term { (PLUS|MINUS) term}
term = factor { (DIV|MUL) factor}
factor = [sign] ( NUMBER | VARIABLE | group )
expression = term { (PLUS | MINUS) term}
term = factor { (DIV | MUL) factor}
factor = [sign] (NUMBER | VARIABLE | group) { VARIABLE | group }
sign = POSITIVE | NEGATIVE
group = "(" expression ")"
......@@ -32,7 +32,7 @@ group = "(" expression ")"
PLUS = "+"
MINUS = "-"
MUL = "*" | &factor # TODO: higher precedence of &factor
MUL = "*"
DIV = "/"
POSITIVE = /[+]/ # no implicit whitespace after signs
......
......@@ -59,8 +59,7 @@ class ArithmeticGrammar(Grammar):
r"""Parser for an Arithmetic source file.
"""
expression = Forward()
factor = Forward()
source_hash__ = "6bca790f81db2b6dda4c92abdbe06d90"
source_hash__ = "a8a1011bf1a9e1204d87031054b831f4"
static_analysis_pending__ = [True]
parser_initialization__ = ["upon instantiation"]
resume_rules__ = {}
......@@ -74,12 +73,12 @@ class ArithmeticGrammar(Grammar):
NEGATIVE = RegExp('[-]')
POSITIVE = RegExp('[+]')
DIV = Series(Token("/"), dwsp__)
MUL = Alternative(Series(DropToken("*"), dwsp__), Lookahead(factor))
MUL = Series(Token("*"), dwsp__)
MINUS = Series(Token("-"), dwsp__)
PLUS = Series(Token("+"), dwsp__)
group = Series(Series(DropToken("("), dwsp__), expression, Series(DropToken(")"), dwsp__))
sign = Alternative(POSITIVE, NEGATIVE)
factor.set(Series(Option(sign), Alternative(NUMBER, VARIABLE, group)))
factor = Series(Option(sign), Alternative(NUMBER, VARIABLE, group), ZeroOrMore(Alternative(VARIABLE, group)))
term = Series(factor, ZeroOrMore(Series(Alternative(DIV, MUL), factor)))
expression.set(Series(term, ZeroOrMore(Series(Alternative(PLUS, MINUS), term))))
root__ = expression
......@@ -108,11 +107,9 @@ def group_no_asterix_mul(context):
Arithmetic_AST_transformation_table = {
# AST Transformations for the Arithmetic-grammar
"expression": [left_associative, replace_by_single_child],
"term": [left_associative, replace_by_single_child],
"factor": [replace_by_single_child],
"expression, term": [left_associative, replace_by_single_child],
"factor, sign": replace_by_single_child,
"group": [remove_tokens('(', ')'), replace_by_single_child],
"sign": [replace_by_single_child]
}
......
......@@ -14,6 +14,9 @@ M3: "-2.71828"
M4: "-x"
M5: "(2 + x)"
M6: "-(a * b)"
M7: "2x"
M8: "-2x"
M9: "-(2 + 4)x(3 + 4)"
[fail:factor]
F1: "x4"
......
......@@ -24,7 +24,7 @@ except ModuleNotFoundError:
CONFIG_PRESET['ast_serialization'] = "S-expression"
CONFIG_PRESET['test_parallelization'] = False
CONFIG_PRESET['test_parallelization'] = True
def recompile_grammar(grammar_src, force):
grammar_tests_dir = os.path.join(scriptpath, 'grammar_tests')
......
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