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macro_parser.py
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macro_parser.py
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# coding: UTF-8
'''Module that parses the macro_data.txt file. Creates macros and handles
configuration of Catalysis.'''
import re
import sys
from catalysis_globals import (
extract_data, int_at_least, Invalid, key_or_value, quote_replace,
terminate)
from frame_library import reserved_names
file_name = "macro_data.txt"
class ObjectParser(object):
'''This class actually parses the macro. Each method consists of parsing
instructions for a state of the file, and then returns the new file
state.'''
def __init__(self):
self.next_method = self.no_macro
self.return_to = self.no_macro
self.active_macro = []
self.macro_dict = {}
self.config_dict = {
"autopause": "on", "autowrap": True, "autoquote": True, ".": "250",
"!": "250", ",": "125", "-": "200", "–": "200", "—": "200",
"?": "250", "...": "500", ";": "200", ":": "200", "startup": 0,
"autoescape": set(), "threelines": True
}
self.customization_dict = {
"autoquote": {"on": True, "off": False},
"autopause": {"on": "on", "legacy": "legacy", "off": False},
"autowrap": {"on": True, "off": False},
"threelines": {"on": True, "off": False},
"startup": {
"s": 0, "d": 1, "b": 2, "skip": 0, "during": 1, "before": 2}
}
def no_macro(self, line):
'''Handle parsing while not inside a macro.'''
if line == "CONFIG {":
return self.config
try:
macro = re.match(r"(\w+)\s*\{$", line).group(1)
except AttributeError:
raise Invalid("unk line")
if macro.lower() == "config":
return self.config
if macro in self.macro_dict:
raise Invalid("ban duplicate", "Macro", macro)
# You can't give a macro the same name as a frame action.
if macro in reserved_names:
raise Invalid("keyword claim", "Macro", macro)
self.macro_dict[macro] = self.active_macro = []
return self.in_macro
def in_macro(self, line):
'''Handle parsing while inside a macro.'''
if line == "}":
# Conceptualizes that there's no active_macro anymore.
self.active_macro = []
return self.no_macro
else:
# Add this line to the list of lines that the macro stands for.
self.active_macro.append(line)
return self.in_macro
def config(self, line):
'''Handle parsing while inside a configuration block.'''
if line == "}":
return self.no_macro
try:
attr, value = line.rsplit(":", maxsplit=1)
value = value.strip()
attr, value = attr.lower(), value.lower()
except ValueError:
raise Invalid("config colon")
if attr not in self.config_dict:
raise Invalid("config attr", attr)
if attr in self.customization_dict:
self.config_dict[attr] = key_or_value(
value, self.customization_dict[attr], attr)
elif attr == "autoescape":
self.config_dict[attr].update(value.split())
else:
self.config_dict[attr] = int_at_least(
value, 0, "Configuration attribute " + attr)
return self.config
def in_comment(self, line):
'''Handles parsing inside a mutliline comment.'''
if line.endswith("*/"):
return self.return_to
return self.in_comment
def cleanup(self):
'''Handle validation after parsing is completed.'''
# Equivalent to if self.active_macro exists.
if self.next_method != self.no_macro:
raise Invalid("unclosed", "Macro")
def parse_file(macro_test):
'''Open the file, for-loop over the lines, feed them to the parser,
validate, and return the macros, configuration, and automation.'''
# Careful! If macro_test == "", we stick with that.
lines = extract_data(file_name) if macro_test is False else (
macro_test.splitlines())
parser = ObjectParser()
for i, line in enumerate(lines, start=1):
# Escape stylized quotes with ASCII quotes if set to do so.
line = line.strip()
if not line:
continue
if parser.config_dict["autoquote"]:
line = re.sub("‘|’|“|”", quote_replace, line)
if line.startswith("/*") and parser.next_method != parser.in_comment:
parser.return_to = parser.next_method
parser.next_method = parser.in_comment(line)
elif line.startswith("//"):
pass
else:
try:
parser.next_method = parser.next_method(line)
except Invalid:
print(sys.exc_info()[1].message.format(
"line {}".format(i), file_name))
Invalid.err_count += 1
if Invalid.err_count >= Invalid.max_err:
terminate()
try:
if lines:
parser.cleanup()
except Invalid:
print(sys.exc_info()[1].message.format("end of file", file_name))
terminate()
if Invalid.err_count:
terminate()
parser.config_dict["…"] = parser.config_dict.pop("...")
return parser.macro_dict, parser.config_dict