def matrix(self, node, cur):
"""
Verbatim matrices
Args:
self (Builder): Code constructor
node (Node): Parent node
cur (int): Current position in code
Returns:
int : End of matrix
Example:
>>> builder = mc.Builder(True)
>>> builder.load("unnamed", "[[1 2] [3 4]]")
loading unnamed
Program functions.program
0 Main functions.main
0 Codeblock codeblock.codeblock
0 Statement codeblock.codeblock '[[1 2] [3 4]]'
0 Expression expression.create '[[1 2] [3 4]]'
0 Matrix misc.matrix '[[1 2] [3 4]]'
1 Vector misc.matrix '[1 2] [3 4]'
1 Expression expression.create '[1 2]'
1 Matrix misc.matrix '[1 2]'
2 Vector misc.matrix '1 2'
2 Expression expression.create '1'
2 Int misc.number '1'
4 Expression expression.create '2'
4 Int misc.number '2'
7 Expression expression.create '[3 4]'
7 Matrix misc.matrix '[3 4]'
8 Vector misc.matrix '3 4'
8 Expression expression.create '3'
8 Int misc.number '3'
10 Expression expression.create '4'
10 Int misc.number '4'
>>> builder.configure(suggest=False)
>>> print mc.qtree(builder, core=True) # doctest: +NORMALIZE_WHITESPACE
1 1Block code_block TYPE
1 1| Statement code_block TYPE
1 1| | Matrix matrix irowvec
1 2| | | Vector matrix irowvec
1 2| | | | Matrix matrix irowvec
1 3| | | | | Vector matrix irowvec
1 3| | | | | | Int int int
1 5| | | | | | Int int int
1 8| | | | Matrix matrix irowvec
1 9| | | | | Vector matrix irowvec
1 9| | | | | | Int int int
1 11| | | | | | Int int int
"""
if self.code[cur] != "[":
self.syntaxerror(cur, "bracket start")
end = findend.matrix(self, cur)
if self.disp:
print "%4d Matrix " % cur,
print "%-20s" % "misc.matrix",
print repr(self.code[cur : end + 1])
if identify.space_delimited(self, cur):
L = iterate.space_list(self, cur)
else:
L = iterate.comma_list(self, cur)
matrix = mc.collection.Matrix(node, cur=cur, code=self.code[cur : end + 1])
for array in L:
if array:
start = array[0][0]
end = array[-1][-1]
else:
start = cur
vector = mc.collection.Vector(matrix, cur=start, code=self.code[start : end + 1])
if self.disp:
print "%4d Vector " % (start),
print "%-20s" % "misc.matrix",
print repr(self.code[start : end + 1])
for start, end in array:
self.create_expression(vector, start, end)
if not L:
if self.disp:
print "%4d Vector " % cur,
print "%-20s" % "misc.matrix",
print repr("")
vector = mc.collection.Vector(matrix, cur=cur, code="")
return findend.matrix(self, cur)
def create(self, node, start, end=None, start_opr=None):
"""
Create expression in three steps:
1) In order, split into sub-expressions for each dividing operator
2) Address prefixes, postfixes, parenthesises, etc.
3) Identify the remaining singleton
Args:
self (Builder): Code constructor.
node (Node): Reference to the parent node
start (int): current possition in code
end (int, optional): end of expression. Required for space-delimited expression.
start_opr (str, optional): At which operator the recursive process is. (For internal use)
Returns:
int : index to end of the expression
Examples::
>>> builder = mc.Builder(True)
>>> builder.load("unnamed", "a*b+c/d")
loading unnamed
Program functions.program
0 Main functions.main
0 Codeblock codeblock.codeblock
0 Statement codeblock.codeblock 'a*b+c/d'
0 Expression expression.create 'a*b+c/d'
0 Expression expression.create 'a*b'
0 Expression expression.create 'a'
0 Var variables.variable 'a'
2 Expression expression.create 'b'
2 Var variables.variable 'b'
4 Expression expression.create 'c/d'
4 Expression expression.create 'c'
4 Var variables.variable 'c'
6 Expression expression.create 'd'
6 Var variables.variable 'd'
>>> builder.configure(suggest=False)
>>> print mc.qtree(builder, core=True) # doctest: +NORMALIZE_WHITESPACE
1 1Block code_block TYPE
1 1| Statement code_block TYPE
1 1| | Plus expression TYPE
1 1| | | Mul expression TYPE
1 1| | | | Var unknown TYPE a
1 3| | | | Var unknown TYPE b
1 5| | | Matrixdivisionexpression TYPE
1 5| | | | Var unknown TYPE c
1 7| | | | Var unknown TYPE d
"""
if self.code[start:start + 3] == "...":
start = findend.dots(self, start)
start += 1
while self.code[start] in " \t":
start += 1
if self.code[start] == ":":
if self.disp:
print "%4d Expression " % (start),
print "%-20s" % "expression.create",
print repr(self.code[start:start + 1])
print "%4d All " % (start),
print "%-20s" % "expression.create",
print repr(self.code[start:start + 1])
mc.collection.All(node, cur=start, code=self.code[start])
return start
if end is None:
end = findend.expression(self, start)
if self.disp:
print "%4d Expression " % (start),
print "%-20s" % "expression.create",
print repr(self.code[start:end + 1])
if self.code[start] not in c.e_start:
self.syntaxerror(start, "expression start")
operators = [
"||", "&&", "|", "&", "~=", "==", ">=", ">", "<=", "<", ":", "+", "-",
".*", "*", "./", "/", ".\\", "\\", ".^", "^"
]
if not (start_opr is None):
operators = operators[operators.index(start_opr) + 1:]
for opr in operators:
# Pre-screen
if opr not in self.code[start:end + 1]:
continue
starts = [start]
last = start
ends = []
k = start
while True:
if self.code[k] == "(":
k = last = findend.paren(self, k)
elif self.code[k] == "[":
k = last = findend.matrix(self, k)
elif self.code[k] == "{":
k = last = findend.cell(self, k)
elif self.code[k] == "'":
if identify.string(self, k):
k = last = findend.string(self, k)
else:
last = k
elif opr == self.code[k:k + len(opr)]:
if opr in "+-":
# no prefixes and no (scientific) numbers
if self.code[last] not in c.letters+c.digits+")]}" or\
self.code[k-1] in "dDeE" and self.code[k-2] in\
c.digits+"." and self.code[k+1] in c.digits:
k += 1
continue
k += len(opr) - 1
while self.code[k + 1] in " \t":
k += 1
# no all-operator
if opr == ":" and self.code[k + 1] in ",;\n)]}":
k += 1
continue
starts.append(k + 1)
ends.append(last)
elif self.code[k] in c.letters + c.digits + "_":
last = k
k += 1
if k >= end:
ends.append(end)
break
if len(ends) > 1:
node = retrieve_operator(self, opr)(node)
node.cur = start
node.code = self.code[starts[0]:ends[-1] + 1]
for s, e in zip(starts, ends):
create(self, node, s, e, opr)
return end
# All operators removed at this point!
END = end
# Prefixes
while self.code[start] in "-~":
if self.code[start] == "-":
node = mc.collection.Neg(node,
cur=start,
code=self.code[start:end + 1])
start += 1
if self.code[start] == "~":
node = mc.collection.Not(node,
cur=start,
code=self.code[start:end + 1])
start += 1
while self.code[start] in " \t":
start += 1
# Postfixes
if self.code[end] == "'" and not self.code[start] == "'":
if self.code[end - 1] == ".":
node = mc.collection.Transpose(node,
cur=start,
code=self.code[start:end + 1])
end -= 2
else:
node = mc.collection.Ctranspose(node,
cur=start,
code=self.code[start:end + 1])
node.cur = start
node.code = self.code[start:end + 1]
end -= 1
while self.code[end] in " \t":
end -= 1
# Parenthesis
if self.code[start] == "(":
if self.code[end] != ")":
self.syntaxerror(end, "parenthesis end")
node = mc.collection.Paren(node,
cur=start,
code=self.code[start:end + 1])
start += 1
while self.code[start] in " \t":
start += 1
end -= 1
while self.code[end] in " \t":
end -= 1
return create(self, node, start, end)
# Reserved keywords
elif self.code[start:start +
3] == "end" and self.code[start + 3] in " +-:\t" + c.e_end:
node = mc.collection.End(node,
cur=start,
code=self.code[start:start + 3])
elif self.code[start:start + 6] == "return" and self.code[start +
6] in " ,;\n":
node = mc.collection.Return(node,
cur=start,
code=self.code[start:start + 6])
elif self.code[start:start + 5] == "break" and self.code[start +
5] in " ,;\n":
node = mc.collection.Break(node,
cur=start,
code=self.code[start:start + 5])
# Rest
elif self.code[start] == "'":
if self.code[end] != "'":
self.syntaxerror(end, "string end")
if "\n" in self.code[start:end]:
self.syntaxerror(end, "non line-feed characters in string")
mc.collection.String(node,
self.code[start + 1:end],
cur=start,
code=self.code[start:end + 1])
elif self.code[start] in c.digits or\
self.code[start] == "." and self.code[start+1] in c.digits:
cur = self.create_number(node, start)
elif self.code[start] == "[":
cur = self.create_matrix(node, start)
elif self.code[start] == "{":
cur = self.create_cell(node, start)
else:
if self.code[start] not in c.letters + "@":
self.syntaxerror(start, "variable name")
cur = self.create_variable(node, start)
return END
def matrix(self, node, cur):
"""
Verbatim matrices
Args:
self (Builder): Code constructor
node (Node): Parent node
cur (int): Current position in code
Returns:
int : End of matrix
Example:
>>> builder = mc.Builder(True)
>>> builder.load("unnamed", "[[1 2] [3 4]]")
loading unnamed
Program functions.program
0 Main functions.main
0 Codeblock codeblock.codeblock
0 Statement codeblock.codeblock '[[1 2] [3 4]]'
0 Expression expression.create '[[1 2] [3 4]]'
0 Matrix misc.matrix '[[1 2] [3 4]]'
1 Vector misc.matrix '[1 2] [3 4]'
1 Expression expression.create '[1 2]'
1 Matrix misc.matrix '[1 2]'
2 Vector misc.matrix '1 2'
2 Expression expression.create '1'
2 Int misc.number '1'
4 Expression expression.create '2'
4 Int misc.number '2'
7 Expression expression.create '[3 4]'
7 Matrix misc.matrix '[3 4]'
8 Vector misc.matrix '3 4'
8 Expression expression.create '3'
8 Int misc.number '3'
10 Expression expression.create '4'
10 Int misc.number '4'
>>> builder.configure(suggest=False)
>>> print mc.qtree(builder, core=True) # doctest: +NORMALIZE_WHITESPACE
1 1Block code_block TYPE
1 1| Statement code_block TYPE
1 1| | Matrix matrix irowvec
1 2| | | Vector matrix irowvec
1 2| | | | Matrix matrix irowvec
1 3| | | | | Vector matrix irowvec
1 3| | | | | | Int int int
1 5| | | | | | Int int int
1 8| | | | Matrix matrix irowvec
1 9| | | | | Vector matrix irowvec
1 9| | | | | | Int int int
1 11| | | | | | Int int int
"""
if self.code[cur] != "[":
self.syntaxerror(cur, "bracket start")
end = findend.matrix(self, cur)
if self.disp:
print "%4d Matrix " % cur,
print "%-20s" % "misc.matrix",
print repr(self.code[cur:end + 1])
if identify.space_delimited(self, cur):
L = iterate.space_list(self, cur)
else:
L = iterate.comma_list(self, cur)
matrix = mc.collection.Matrix(node, cur=cur, code=self.code[cur:end + 1])
for array in L:
if array:
start = array[0][0]
end = array[-1][-1]
else:
start = cur
vector = mc.collection.Vector(matrix,
cur=start,
code=self.code[start:end + 1])
if self.disp:
print "%4d Vector " % (start),
print "%-20s" % "misc.matrix",
print repr(self.code[start:end + 1])
for start, end in array:
self.create_expression(vector, start, end)
if not L:
if self.disp:
print "%4d Vector " % cur,
print "%-20s" % "misc.matrix",
print repr("")
vector = mc.collection.Vector(matrix, cur=cur, code="")
return findend.matrix(self, cur)
def codeblock(self, parent, start):
'''
If-ifelse-else branch
Args:
self (Builder): Code constructor
parent (Node): Parent node
cur (int): Current position in code
Returns:
int: Index to end of codeblock
Example:
>>> builder = mc.Builder(True)
>>> builder.load("unnamed", "a; 'b'; 3")
loading unnamed
Program functions.program
0 Main functions.main
0 Codeblock codeblock.codeblock
0 Statement codeblock.codeblock 'a'
0 Expression expression.create 'a'
0 Var variables.variable 'a'
3 Statement codeblock.codeblock "'b'"
3 String misc.string "'b'"
8 Statement codeblock.codeblock '3'
8 Expression expression.create '3'
8 Int misc.number '3'
>>> builder.configure()
>>> print mc.qtree(builder, core=True) # doctest: +NORMALIZE_WHITESPACE
1 1Block code_block TYPE
1 1| Statement code_block TYPE
1 1| | Var unknown TYPE a
1 4| Statement code_block TYPE
1 4| | String string string
1 9| Statement code_block TYPE
1 9| | Int int int
'''
cur = start
block = mc.collection.Block(parent, cur=cur)
if self.disp:
print "%4d Codeblock " % cur,
print "%-20s" % "codeblock.codeblock"
while True:
if self.code[cur] in " \t;":
pass
elif self.code[cur] == "\n":
if len(self.code)-cur < 3:
break
#%%PARFOR token
elif self.code[cur:cur+8] == "%%PARFOR":
cur = self.create_pragma_parfor(block, cur)
elif self.code[cur] == "%":
cur = self.create_comment(block, cur)
elif self.code[cur:cur+3] == "___":
cur = self.create_verbatim(block, cur)
elif self.code[cur] == "[":
# Divide between statement and assignment
eq_loc = findend.matrix(self, cur)+1
while self.code[eq_loc] in " \t":
eq_loc += 1
if self.code[eq_loc] == "=" and self.code[eq_loc+1] != "=":
cur = self.create_assigns(block, cur, eq_loc)
else:
statement = mc.collection.Statement(block, cur=cur)
end = findend.expression(self, cur)
if self.disp:
print "%4d Statement " % cur,
print "%-20s" % "codeblock.codeblock",
print repr(self.code[cur:end+1])
statement.code = self.code[cur:end+1]
cur = self.create_expression(
statement, cur, end=end)
elif self.code[cur] == "'":
end = findend.string(self, cur)
if self.disp:
print "%4d Statement " % cur,
print "%-20s" % "codeblock.codeblock",
print repr(self.code[cur:end+1])
statement = mc.collection.Statement(block, cur=cur,
code=self.code[cur:end+1])
cur = self.create_string(statement, cur)
elif self.code[cur:cur+4] == "case" and self.code[cur+4] in c.k_end:
break
elif self.code[cur:cur+5] == "catch" and self.code[cur+5] in c.k_end:
break
elif self.code[cur:cur+3] == "end" and self.code[cur+3] in c.k_end:
cur += 3
break
elif self.code[cur:cur+4] == "else" and self.code[cur+4] in c.k_end:
break
elif self.code[cur:cur+6] == "elseif" and self.code[cur+6] in c.k_end:
break
elif self.code[cur:cur+6] == "parfor" and self.code[cur+6] in c.k_end:
cur = self.create_parfor(block, cur)
elif self.code[cur:cur+3] == "for" and self.code[cur+3] in c.k_end:
cur = self.create_for(block, cur)
elif self.code[cur:cur+8] == "function" and\
self.code[cur+8] in c.k_end + "[":
cur -= 1
break
elif self.code[cur:cur+2] == "if" and self.code[cur+2] in c.k_end:
cur = self.create_if(block, cur)
elif self.code[cur:cur+9] == "otherwise" and self.code[cur+9] in c.k_end:
break
elif self.code[cur:cur+6] == "switch" and self.code[cur+6] in c.k_end:
cur = self.create_switch(block, cur)
elif self.code[cur:cur+3] == "try" and self.code[cur+3] in c.k_end:
cur = self.create_try(block, cur)
elif self.code[cur:cur+5] == "while" and self.code[cur+5] in c.k_end:
cur = self.create_while(block, cur)
elif self.code[cur:cur+4] == "hold" and \
self.code[cur+4] not in c.letters+c.digits+"_":
cur = self.create_reserved(block, cur)
elif self.code[cur:cur+4] == "grid" and \
self.code[cur+4] not in c.letters+c.digits+"_":
cur = self.create_reserved(block, cur)
elif self.code[cur] in c.e_start:
j = findend.expression(self, cur)
j += 1
while self.code[j] in " \t":
j += 1
eq_loc = j
if self.code[eq_loc] == "=": # and self.code[eq_loc+1] != "=":
j = eq_loc +1
while self.code[j] in " \t":
j += 1
if self.code[j] == "@":
cur = self.create_lambda_assign(block, cur, eq_loc)
else:
cur = self.create_assign(block, cur, eq_loc)
else:
end = findend.expression(self, cur)
if self.disp:
print "%4d Statement " % cur,
print "%-20s" % "codeblock.codeblock",
print repr(self.code[cur:end+1])
statement = mc.collection.Statement(block, cur=cur,
code=self.code[cur:end+1])
cur = self.create_expression(statement,
cur, end=end)
cur += 1
if len(self.code)-cur<3:
break
block.code = self.code[start:cur+1]
return cur
def codeblock(self, parent, start):
'''
If-ifelse-else branch
Args:
self (Builder): Code constructor
parent (Node): Parent node
cur (int): Current position in code
Returns:
int: Index to end of codeblock
Example:
>>> builder = mc.Builder(True)
>>> builder.load("unnamed", "a; 'b'; 3")
loading unnamed
Program functions.program
0 Main functions.main
0 Codeblock codeblock.codeblock
0 Statement codeblock.codeblock 'a'
0 Expression expression.create 'a'
0 Var variables.variable 'a'
3 Statement codeblock.codeblock "'b'"
3 String misc.string "'b'"
8 Statement codeblock.codeblock '3'
8 Expression expression.create '3'
8 Int misc.number '3'
>>> builder.configure()
>>> print mc.qtree(builder, core=True) # doctest: +NORMALIZE_WHITESPACE
1 1Block code_block TYPE
1 1| Statement code_block TYPE
1 1| | Var unknown TYPE a
1 4| Statement code_block TYPE
1 4| | String string string
1 9| Statement code_block TYPE
1 9| | Int int int
'''
cur = start
block = mc.collection.Block(parent, cur=cur)
if self.disp:
print "%4d Codeblock " % cur,
print "%-20s" % "codeblock.codeblock"
is_end_terminated = False
while True:
#print self.code[cur:cur+5]
if self.code[cur] in " \t;":
pass
elif self.code[cur] == "\n":
if len(self.code) - cur < 3:
break
#%#PARFOR token
elif self.code[cur:cur + 8] == "%#PARFOR":
cur = self.create_pragma_parfor(block, cur)
elif self.code[cur] == "%":
cur = self.create_comment(block, cur)
elif self.code[cur:cur + 3] == "___":
cur = self.create_verbatim(block, cur)
elif self.code[cur] == "[":
# Divide between statement and assignment
eq_loc = findend.matrix(self, cur) + 1
while self.code[eq_loc] in " \t":
eq_loc += 1
if self.code[eq_loc] == "=" and self.code[eq_loc + 1] != "=":
cur = self.create_assigns(block, cur, eq_loc)
else:
statement = mc.collection.Statement(block, cur=cur)
end = findend.expression(self, cur)
if self.disp:
print "%4d Statement " % cur,
print "%-20s" % "codeblock.codeblock",
print repr(self.code[cur:end + 1])
statement.code = self.code[cur:end + 1]
cur = self.create_expression(statement, cur, end=end)
elif self.code[cur] == "'":
end = findend.string(self, cur)
if self.disp:
print "%4d Statement " % cur,
print "%-20s" % "codeblock.codeblock",
print repr(self.code[cur:end + 1])
statement = mc.collection.Statement(block,
cur=cur,
code=self.code[cur:end + 1])
cur = self.create_string(statement, cur)
elif self.code[cur:cur + 4] == "case" and self.code[cur +
4] in c.k_end:
break
elif self.code[cur:cur + 5] == "catch" and self.code[cur +
5] in c.k_end:
break
elif self.code[cur:cur + 3] == "end" and self.code[cur + 3] in c.k_end:
cur += 3
is_end_terminated = True
break
elif self.code[cur:cur + 4] == "else" and self.code[cur +
4] in c.k_end:
break
elif self.code[cur:cur + 6] == "elseif" and self.code[cur +
6] in c.k_end:
break
elif self.code[cur:cur + 6] == "parfor" and self.code[cur +
6] in c.k_end:
cur = self.create_parfor(block, cur)
elif self.code[cur:cur + 3] == "for" and self.code[cur + 3] in c.k_end:
cur = self.create_for(block, cur)
elif self.code[cur:cur+8] == "function" and\
self.code[cur+8] in c.k_end + "[":
cur -= 1
break
elif self.code[cur:cur + 2] == "if" and self.code[cur + 2] in c.k_end:
cur = self.create_if(block, cur)
elif self.code[cur:cur + 9] == "otherwise" and self.code[cur +
9] in c.k_end:
break
elif self.code[cur:cur + 6] == "switch" and self.code[cur +
6] in c.k_end:
cur = self.create_switch(block, cur)
elif self.code[cur:cur + 3] == "try" and self.code[cur + 3] in c.k_end:
cur = self.create_try(block, cur)
elif self.code[cur:cur + 5] == "while" and self.code[cur +
5] in c.k_end:
cur = self.create_while(block, cur)
elif self.code[cur:cur+4] == "hold" and \
self.code[cur+4] not in c.letters+c.digits+"_":
cur = self.create_reserved(block, cur)
elif self.code[cur:cur+4] == "load" and \
self.code[cur+4] not in c.letters+c.digits+"_":
cur = self.create_reserved(block, cur)
elif self.code[cur:cur+4] == "disp" and \
self.code[cur+4] not in c.letters+c.digits+"_":
cur = self.create_reserved(block, cur)
elif self.code[cur:cur+4] == "grid" and \
self.code[cur+4] not in c.letters+c.digits+"_":
cur = self.create_reserved(block, cur)
elif self.code[cur] in c.e_start:
j = findend.expression(self, cur)
j += 1
while self.code[j] in " \t":
j += 1
eq_loc = j
if self.code[eq_loc] == "=": # and self.code[eq_loc+1] != "=":
j = eq_loc + 1
while self.code[j] in " \t":
j += 1
if self.code[j] == "@":
cur = self.create_lambda_assign(block, cur, eq_loc)
else:
cur = self.create_assign(block, cur, eq_loc)
else:
end = findend.expression(self, cur)
if self.disp:
print "%4d Statement " % cur,
print "%-20s" % "codeblock.codeblock",
print repr(self.code[cur:end + 1])
statement = mc.collection.Statement(block,
cur=cur,
code=self.code[cur:end +
1])
cur = self.create_expression(statement, cur, end=end)
cur += 1
if len(self.code) - cur < 3:
break
block.is_end_terminated = is_end_terminated
block.code = self.code[start:cur + 1]
return cur
def space_delimited(self, start):
"""
Check if list is space-delimited
Args:
self (Builder): Code constructor
start (int): Current position in code
Returns:
bool: True if list consists of whitespace delimiters
"""
if self.code[start] not in c.l_start:
self.syntaxerror(start, "list start")
k = start + 1
while self.code[k] in " \t":
k += 1
if self.code[k] in c.l_end:
return False
if self.code[k] not in c.e_start:
self.syntaxerror(k, "expression start")
if self.code[k] == "'":
k = findend.string(self, k) + 1
while self.code[k] in " \t":
k += 1
while True:
if self.code[k] == "(":
k = findend.paren(self, k)
elif self.code[k] == "[":
k = findend.matrix(self, k)
elif self.code[k] == "{":
k = findend.cell(self, k)
elif self.code[k] == "'":
# if self.code[k-1] in c.s_start:
return True
elif self.code[k : k + 3] == "...":
k = findend.dots(self, k)
elif self.code[k] in " \t":
if space_delimiter(self, k):
return True
while self.code[k + 1] in " \t":
k += 1
elif self.code[k] in c.e_end:
if self.code[k] == ",":
return False
elif self.code[k] in c.l_end:
return False
elif self.code[k] != ";":
return True
while self.code[k + 1] in " \t":
k += 1
elif self.code[k + 1] in c.letters + c.digits + "_@":
while self.code[k + 1] in c.letters + c.digits + "_@":
k += 1
k += 1
def create(self, node, start, end=None, start_opr=None):
"""
Create expression in three steps:
1) In order, split into sub-expressions for each dividing operator
2) Address prefixes, postfixes, parenthesises, etc.
3) Identify the remaining singleton
Args:
self (Builder): Code constructor.
node (Node): Reference to the parent node
start (int): current possition in code
end (int, optional): end of expression. Required for space-delimited expression.
start_opr (str, optional): At which operator the recursive process is. (For internal use)
Returns:
int : index to end of the expression
Examples::
>>> builder = mc.Builder(True)
>>> builder.load("unnamed", "a*b+c/d")
loading unnamed
Program functions.program
0 Main functions.main
0 Codeblock codeblock.codeblock
0 Statement codeblock.codeblock 'a*b+c/d'
0 Expression expression.create 'a*b+c/d'
0 Expression expression.create 'a*b'
0 Expression expression.create 'a'
0 Var variables.variable 'a'
2 Expression expression.create 'b'
2 Var variables.variable 'b'
4 Expression expression.create 'c/d'
4 Expression expression.create 'c'
4 Var variables.variable 'c'
6 Expression expression.create 'd'
6 Var variables.variable 'd'
>>> builder.configure(suggest=False)
>>> print mc.qtree(builder, core=True) # doctest: +NORMALIZE_WHITESPACE
1 1Block code_block TYPE
1 1| Statement code_block TYPE
1 1| | Plus expression TYPE
1 1| | | Mul expression TYPE
1 1| | | | Var unknown TYPE a
1 3| | | | Var unknown TYPE b
1 5| | | Matrixdivisionexpression TYPE
1 5| | | | Var unknown TYPE c
1 7| | | | Var unknown TYPE d
"""
if self.code[start:start+3] == "...":
start = findend.dots(self, start)
start += 1
while self.code[start] in " \t":
start += 1
if self.code[start] == ":":
if self.disp:
print "%4d Expression " % (start),
print "%-20s" % "expression.create",
print repr(self.code[start:start+1])
print "%4d All " % (start),
print "%-20s" % "expression.create",
print repr(self.code[start:start+1])
mc.collection.All(node, cur=start, code=self.code[start])
return start
if end is None:
end = findend.expression(self, start)
if self.disp:
print "%4d Expression " % (start),
print "%-20s" % "expression.create",
print repr(self.code[start:end+1])
if self.code[start] not in c.e_start:
self.syntaxerror(start, "expression start")
operators = [
"||", "&&", "|", "&",
"~=", "==", ">=", ">", "<=", "<",
":", "+", "-",
".*", "*", "./", "/", ".\\", "\\",
".^", "^"]
if not (start_opr is None):
operators = operators[operators.index(start_opr)+1:]
for opr in operators:
# Pre-screen
if opr not in self.code[start:end+1]:
continue
starts = [start]
last = start
ends = []
k = start
while True:
if self.code[k] == "(":
k = last = findend.paren(self, k)
elif self.code[k] == "[":
k = last = findend.matrix(self, k)
elif self.code[k] == "{":
k = last = findend.cell(self, k)
elif self.code[k] == "'":
if identify.string(self, k):
k = last = findend.string(self, k)
else:
last = k
elif opr == self.code[k:k+len(opr)]:
if opr in "+-":
# no prefixes and no (scientific) numbers
if self.code[last] not in c.letters+c.digits+")]}" or\
self.code[k-1] in "dDeE" and self.code[k-2] in\
c.digits+"." and self.code[k+1] in c.digits:
k += 1
continue
k += len(opr)-1
while self.code[k+1] in " \t":
k += 1
# no all-operator
if opr == ":" and self.code[k+1] in ",;\n)]}":
k += 1
continue
starts.append(k+1)
ends.append(last)
elif self.code[k] in c.letters+c.digits+"_":
last = k
k += 1
if k >= end:
ends.append(end)
break
if len(ends)>1:
node = retrieve_operator(self, opr)(node)
node.cur = start
node.code = self.code[starts[0]:ends[-1]+1]
for s,e in zip(starts, ends):
create(self, node, s, e, opr)
return end
# All operators removed at this point!
END = end
# Prefixes
while self.code[start] in "-~":
if self.code[start] == "-":
node = mc.collection.Neg(node, cur=start, code=self.code[start:end+1])
start += 1
if self.code[start] == "~":
node = mc.collection.Not(node, cur=start, code=self.code[start:end+1])
start += 1
while self.code[start] in " \t":
start += 1
# Postfixes
if self.code[end] == "'" and not self.code[start] == "'":
if self.code[end-1] == ".":
node = mc.collection.Transpose(node, cur=start,
code=self.code[start:end+1])
end -= 2
else:
node = mc.collection.Ctranspose(node, cur=start,
code=self.code[start:end+1])
node.cur = start
node.code = self.code[start:end+1]
end -= 1
while self.code[end] in " \t":
end -= 1
# Parenthesis
if self.code[start] == "(":
if self.code[end] != ")":
self.syntaxerror(end, "parenthesis end")
node = mc.collection.Paren(node, cur=start, code=self.code[start:end+1])
start += 1
while self.code[start] in " \t":
start += 1
end -= 1
while self.code[end] in " \t":
end -= 1
return create(self, node, start, end)
# Reserved keywords
elif self.code[start:start+3] == "end": # and self.code[start+3] in " \t" + c.e_end:
node = mc.collection.End(node, cur=start, code=self.code[start:start+3])
elif self.code[start:start+6] == "return" and self.code[start+6] in " ,;\n":
node = mc.collection.Return(node, cur=start, code=self.code[start:start+6])
elif self.code[start:start+5] == "break" and self.code[start+5] in " ,;\n":
node = mc.collection.Break(node, cur=start, code=self.code[start:start+5])
# Rest
elif self.code[start] == "'":
if self.code[end] != "'":
self.syntaxerror(end, "string end")
if "\n" in self.code[start:end]:
self.syntaxerror(end, "non line-feed characters in string")
mc.collection.String(node, self.code[start+1:end], cur=start,
code=self.code[start:end+1])
elif self.code[start] in c.digits or\
self.code[start] == "." and self.code[start+1] in c.digits:
cur = self.create_number(node, start)
elif self.code[start] == "[":
cur = self.create_matrix(node, start)
elif self.code[start] == "{":
cur = self.create_cell(node, start)
else:
if self.code[start] not in c.letters+"@":
self.syntaxerror(start, "variable name")
cur = self.create_variable(node, start)
return END
def space_delimited(self, start):
"""
Check if list is space-delimited
Args:
self (Builder): Code constructor
start (int): Current position in code
Returns:
bool: True if list consists of whitespace delimiters
"""
if self.code[start] not in c.l_start:
self.syntaxerror(start, "list start")
k = start + 1
while self.code[k] in " \t":
k += 1
if self.code[k] in c.l_end:
return False
if self.code[k] not in c.e_start:
self.syntaxerror(k, "expression start")
if self.code[k] == "'":
k = findend.string(self, k) + 1
while self.code[k] in " \t":
k += 1
while True:
if self.code[k] == "(":
k = findend.paren(self, k)
elif self.code[k] == "[":
k = findend.matrix(self, k)
elif self.code[k] == "{":
k = findend.cell(self, k)
elif self.code[k] == "'" and string(self, k):
#k = findend.string(self, k)
#if self.code[k-1] in c.s_start:
return True
elif self.code[k:k + 3] == "...":
k = findend.dots(self, k)
elif self.code[k] in " \t":
if space_delimiter(self, k):
return True
while self.code[k + 1] in " \t":
k += 1
elif self.code[k] in c.e_end:
if self.code[k] == ",":
return False
elif self.code[k] in c.l_end:
return False
elif self.code[k] != ";":
return True
while self.code[k + 1] in " \t":
k += 1
elif self.code[k + 1] in c.letters + c.digits + "_@":
while self.code[k + 1] in c.letters + c.digits + "_@":
k += 1
k += 1
