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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| """ | ||
| Routines for JSON form syntax, used to support nested JSON request items. | ||
| Highly inspired from the great jarg project <https://github.com/jdp/jarg/blob/master/jarg/jsonform.py>. | ||
| """ | ||
| import re | ||
| from typing import Optional | ||
|
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|
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||
| def step(value: str, is_escaped: bool) -> str: | ||
| if is_escaped: | ||
| value = value.replace(r'\[', '[').replace(r'\]', ']') | ||
| return value | ||
|
|
||
|
|
||
| def find_opening_bracket( | ||
| value: str, | ||
| search=re.compile(r'(?<!\\)\[').search | ||
| ) -> Optional[int]: | ||
| match = search(value) | ||
| if not match: | ||
| return None | ||
| return match.start() | ||
|
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||
|
|
||
| def find_closing_bracket( | ||
| value: str, | ||
| search=re.compile(r'(?<!\\)\]').search | ||
| ) -> Optional[int]: | ||
| match = search(value) | ||
| if not match: | ||
| return None | ||
| return match.start() | ||
|
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||
|
|
||
| def parse_path(path): | ||
| """ | ||
| Parse a string as a JSON path. | ||
| An implementation of "steps to parse a JSON encoding path". | ||
| <https://www.w3.org/TR/html-json-forms/#dfn-steps-to-parse-a-json-encoding-path> | ||
| """ | ||
| original = path | ||
| is_escaped = r'\[' in original | ||
|
|
||
| opening_bracket = find_opening_bracket(original) | ||
| last_step = [(step(path, is_escaped), {'last': True, 'type': 'object'})] | ||
| if opening_bracket is None: | ||
| return last_step | ||
|
|
||
| steps = [(step(original[:opening_bracket], is_escaped), {'type': 'object'})] | ||
| path = original[opening_bracket:] | ||
| while path: | ||
| if path.startswith('[]'): | ||
| steps[-1][1]['append'] = True | ||
| path = path[2:] | ||
| if path: | ||
| return last_step | ||
| elif path[0] == '[': | ||
| path = path[1:] | ||
| closing_bracket = find_closing_bracket(path) | ||
| if closing_bracket is None: | ||
| return last_step | ||
| key = path[:closing_bracket] | ||
| path = path[closing_bracket + 1:] | ||
| try: | ||
| steps.append((int(key), {'type': 'array'})) | ||
| except ValueError: | ||
| steps.append((key, {'type': 'object'})) | ||
| elif path[:2] == r'\[': | ||
| key = step(path[1:path.index(r'\]') + 2], is_escaped) | ||
| path = path[path.index(r'\]') + 2:] | ||
| steps.append((key, {'type': 'object'})) | ||
| else: | ||
| return last_step | ||
|
|
||
| for i in range(len(steps) - 1): | ||
| steps[i][1]['type'] = steps[i + 1][1]['type'] | ||
| steps[-1][1]['last'] = True | ||
| return steps | ||
|
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||
|
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| def set_value(context, step, current_value, entry_value): | ||
| """Apply a JSON value to a context object. | ||
| An implementation of "steps to set a JSON encoding value". | ||
| <https://www.w3.org/TR/html-json-forms/#dfn-steps-to-set-a-json-encoding-value> | ||
| """ | ||
| key, flags = step | ||
| if flags.get('last', False): | ||
| if current_value is None: | ||
| if flags.get('append', False): | ||
| context[key] = [entry_value] | ||
| else: | ||
| if isinstance(context, list) and len(context) <= key: | ||
| context.extend([None] * (key - len(context) + 1)) | ||
| context[key] = entry_value | ||
| elif isinstance(current_value, list): | ||
| context[key].append(entry_value) | ||
| else: | ||
| context[key] = [current_value, entry_value] | ||
| return context | ||
|
|
||
| if current_value is None: | ||
| if flags.get('type') == 'array': | ||
| context[key] = [] | ||
| else: | ||
| if isinstance(context, list) and len(context) <= key: | ||
| context.extend([None] * (key - len(context) + 1)) | ||
| context[key] = {} | ||
| return context[key] | ||
|
|
||
| if isinstance(current_value, dict): | ||
| return context[key] | ||
|
|
||
| if isinstance(current_value, list): | ||
| if flags.get('type') == 'array': | ||
| return current_value | ||
|
|
||
| obj = {} | ||
| for i, item in enumerate(current_value): | ||
| if item is not None: | ||
| obj[i] = item | ||
| else: | ||
| context[key] = obj | ||
| return obj | ||
|
|
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| obj = {'': current_value} | ||
| context[key] = obj | ||
| return obj | ||
|
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|
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| def interpret_json_form(pairs): | ||
| """The application/json form encoding algorithm. | ||
| <https://www.w3.org/TR/html-json-forms/#dfn-application-json-encoding-algorithm> | ||
| """ | ||
| result = {} | ||
| for key, value in pairs: | ||
| steps = parse_path(key) | ||
| context = result | ||
| for step in steps: | ||
| try: | ||
| current_value = context.get(step[0], None) | ||
| except AttributeError: | ||
| try: | ||
| current_value = context[step[0]] | ||
| except IndexError: | ||
| current_value = None | ||
| context = set_value(context, step, current_value, value) | ||
| return result |
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