You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
247 lines
10 KiB
247 lines
10 KiB
"""
|
|
HyperParser
|
|
===========
|
|
This module defines the HyperParser class, which provides advanced parsing
|
|
abilities for the ParenMatch and other extensions.
|
|
The HyperParser uses PyParser. PyParser is intended mostly to give information
|
|
on the proper indentation of code. HyperParser gives some information on the
|
|
structure of code, used by extensions to help the user.
|
|
"""
|
|
|
|
import string
|
|
import keyword
|
|
from idlelib import PyParse
|
|
|
|
class HyperParser:
|
|
|
|
def __init__(self, editwin, index):
|
|
"""Initialize the HyperParser to analyze the surroundings of the given
|
|
index.
|
|
"""
|
|
|
|
self.editwin = editwin
|
|
self.text = text = editwin.text
|
|
|
|
parser = PyParse.Parser(editwin.indentwidth, editwin.tabwidth)
|
|
|
|
def index2line(index):
|
|
return int(float(index))
|
|
lno = index2line(text.index(index))
|
|
|
|
if not editwin.context_use_ps1:
|
|
for context in editwin.num_context_lines:
|
|
startat = max(lno - context, 1)
|
|
startatindex = repr(startat) + ".0"
|
|
stopatindex = "%d.end" % lno
|
|
# We add the newline because PyParse requires a newline at end.
|
|
# We add a space so that index won't be at end of line, so that
|
|
# its status will be the same as the char before it, if should.
|
|
parser.set_str(text.get(startatindex, stopatindex)+' \n')
|
|
bod = parser.find_good_parse_start(
|
|
editwin._build_char_in_string_func(startatindex))
|
|
if bod is not None or startat == 1:
|
|
break
|
|
parser.set_lo(bod or 0)
|
|
else:
|
|
r = text.tag_prevrange("console", index)
|
|
if r:
|
|
startatindex = r[1]
|
|
else:
|
|
startatindex = "1.0"
|
|
stopatindex = "%d.end" % lno
|
|
# We add the newline because PyParse requires a newline at end.
|
|
# We add a space so that index won't be at end of line, so that
|
|
# its status will be the same as the char before it, if should.
|
|
parser.set_str(text.get(startatindex, stopatindex)+' \n')
|
|
parser.set_lo(0)
|
|
|
|
# We want what the parser has, except for the last newline and space.
|
|
self.rawtext = parser.str[:-2]
|
|
# As far as I can see, parser.str preserves the statement we are in,
|
|
# so that stopatindex can be used to synchronize the string with the
|
|
# text box indices.
|
|
self.stopatindex = stopatindex
|
|
self.bracketing = parser.get_last_stmt_bracketing()
|
|
# find which pairs of bracketing are openers. These always correspond
|
|
# to a character of rawtext.
|
|
self.isopener = [i>0 and self.bracketing[i][1] > self.bracketing[i-1][1]
|
|
for i in range(len(self.bracketing))]
|
|
|
|
self.set_index(index)
|
|
|
|
def set_index(self, index):
|
|
"""Set the index to which the functions relate. Note that it must be
|
|
in the same statement.
|
|
"""
|
|
indexinrawtext = \
|
|
len(self.rawtext) - len(self.text.get(index, self.stopatindex))
|
|
if indexinrawtext < 0:
|
|
raise ValueError("The index given is before the analyzed statement")
|
|
self.indexinrawtext = indexinrawtext
|
|
# find the rightmost bracket to which index belongs
|
|
self.indexbracket = 0
|
|
while self.indexbracket < len(self.bracketing)-1 and \
|
|
self.bracketing[self.indexbracket+1][0] < self.indexinrawtext:
|
|
self.indexbracket += 1
|
|
if self.indexbracket < len(self.bracketing)-1 and \
|
|
self.bracketing[self.indexbracket+1][0] == self.indexinrawtext and \
|
|
not self.isopener[self.indexbracket+1]:
|
|
self.indexbracket += 1
|
|
|
|
def is_in_string(self):
|
|
"""Is the index given to the HyperParser is in a string?"""
|
|
# The bracket to which we belong should be an opener.
|
|
# If it's an opener, it has to have a character.
|
|
return self.isopener[self.indexbracket] and \
|
|
self.rawtext[self.bracketing[self.indexbracket][0]] in ('"', "'")
|
|
|
|
def is_in_code(self):
|
|
"""Is the index given to the HyperParser is in a normal code?"""
|
|
return not self.isopener[self.indexbracket] or \
|
|
self.rawtext[self.bracketing[self.indexbracket][0]] not in \
|
|
('#', '"', "'")
|
|
|
|
def get_surrounding_brackets(self, openers='([{', mustclose=False):
|
|
"""If the index given to the HyperParser is surrounded by a bracket
|
|
defined in openers (or at least has one before it), return the
|
|
indices of the opening bracket and the closing bracket (or the
|
|
end of line, whichever comes first).
|
|
If it is not surrounded by brackets, or the end of line comes before
|
|
the closing bracket and mustclose is True, returns None.
|
|
"""
|
|
bracketinglevel = self.bracketing[self.indexbracket][1]
|
|
before = self.indexbracket
|
|
while not self.isopener[before] or \
|
|
self.rawtext[self.bracketing[before][0]] not in openers or \
|
|
self.bracketing[before][1] > bracketinglevel:
|
|
before -= 1
|
|
if before < 0:
|
|
return None
|
|
bracketinglevel = min(bracketinglevel, self.bracketing[before][1])
|
|
after = self.indexbracket + 1
|
|
while after < len(self.bracketing) and \
|
|
self.bracketing[after][1] >= bracketinglevel:
|
|
after += 1
|
|
|
|
beforeindex = self.text.index("%s-%dc" %
|
|
(self.stopatindex, len(self.rawtext)-self.bracketing[before][0]))
|
|
if after >= len(self.bracketing) or \
|
|
self.bracketing[after][0] > len(self.rawtext):
|
|
if mustclose:
|
|
return None
|
|
afterindex = self.stopatindex
|
|
else:
|
|
# We are after a real char, so it is a ')' and we give the index
|
|
# before it.
|
|
afterindex = self.text.index("%s-%dc" %
|
|
(self.stopatindex,
|
|
len(self.rawtext)-(self.bracketing[after][0]-1)))
|
|
|
|
return beforeindex, afterindex
|
|
|
|
# This string includes all chars that may be in a white space
|
|
_whitespace_chars = " \t\n\\"
|
|
# This string includes all chars that may be in an identifier
|
|
_id_chars = string.ascii_letters + string.digits + "_"
|
|
# This string includes all chars that may be the first char of an identifier
|
|
_id_first_chars = string.ascii_letters + "_"
|
|
|
|
# Given a string and pos, return the number of chars in the identifier
|
|
# which ends at pos, or 0 if there is no such one. Saved words are not
|
|
# identifiers.
|
|
def _eat_identifier(self, str, limit, pos):
|
|
i = pos
|
|
while i > limit and str[i-1] in self._id_chars:
|
|
i -= 1
|
|
if i < pos and (str[i] not in self._id_first_chars or \
|
|
keyword.iskeyword(str[i:pos])):
|
|
i = pos
|
|
return pos - i
|
|
|
|
def get_expression(self):
|
|
"""Return a string with the Python expression which ends at the given
|
|
index, which is empty if there is no real one.
|
|
"""
|
|
if not self.is_in_code():
|
|
raise ValueError("get_expression should only be called if index "\
|
|
"is inside a code.")
|
|
|
|
rawtext = self.rawtext
|
|
bracketing = self.bracketing
|
|
|
|
brck_index = self.indexbracket
|
|
brck_limit = bracketing[brck_index][0]
|
|
pos = self.indexinrawtext
|
|
|
|
last_identifier_pos = pos
|
|
postdot_phase = True
|
|
|
|
while 1:
|
|
# Eat whitespaces, comments, and if postdot_phase is False - one dot
|
|
while 1:
|
|
if pos>brck_limit and rawtext[pos-1] in self._whitespace_chars:
|
|
# Eat a whitespace
|
|
pos -= 1
|
|
elif not postdot_phase and \
|
|
pos > brck_limit and rawtext[pos-1] == '.':
|
|
# Eat a dot
|
|
pos -= 1
|
|
postdot_phase = True
|
|
# The next line will fail if we are *inside* a comment, but we
|
|
# shouldn't be.
|
|
elif pos == brck_limit and brck_index > 0 and \
|
|
rawtext[bracketing[brck_index-1][0]] == '#':
|
|
# Eat a comment
|
|
brck_index -= 2
|
|
brck_limit = bracketing[brck_index][0]
|
|
pos = bracketing[brck_index+1][0]
|
|
else:
|
|
# If we didn't eat anything, quit.
|
|
break
|
|
|
|
if not postdot_phase:
|
|
# We didn't find a dot, so the expression end at the last
|
|
# identifier pos.
|
|
break
|
|
|
|
ret = self._eat_identifier(rawtext, brck_limit, pos)
|
|
if ret:
|
|
# There is an identifier to eat
|
|
pos = pos - ret
|
|
last_identifier_pos = pos
|
|
# Now, in order to continue the search, we must find a dot.
|
|
postdot_phase = False
|
|
# (the loop continues now)
|
|
|
|
elif pos == brck_limit:
|
|
# We are at a bracketing limit. If it is a closing bracket,
|
|
# eat the bracket, otherwise, stop the search.
|
|
level = bracketing[brck_index][1]
|
|
while brck_index > 0 and bracketing[brck_index-1][1] > level:
|
|
brck_index -= 1
|
|
if bracketing[brck_index][0] == brck_limit:
|
|
# We were not at the end of a closing bracket
|
|
break
|
|
pos = bracketing[brck_index][0]
|
|
brck_index -= 1
|
|
brck_limit = bracketing[brck_index][0]
|
|
last_identifier_pos = pos
|
|
if rawtext[pos] in "([":
|
|
# [] and () may be used after an identifier, so we
|
|
# continue. postdot_phase is True, so we don't allow a dot.
|
|
pass
|
|
else:
|
|
# We can't continue after other types of brackets
|
|
if rawtext[pos] in "'\"":
|
|
# Scan a string prefix
|
|
while pos > 0 and rawtext[pos - 1] in "rRbBuU":
|
|
pos -= 1
|
|
last_identifier_pos = pos
|
|
break
|
|
|
|
else:
|
|
# We've found an operator or something.
|
|
break
|
|
|
|
return rawtext[last_identifier_pos:self.indexinrawtext]
|