Add json module
This commit is contained in:
K. Lange
parent
b00fcc0c0a
commit
5517162a93
174
modules/json.krk
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174
modules/json.krk
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"""
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JSON parser
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"""
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def loads(s):
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let i = 0
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let value # okay dumb scoping thing, but we'll assign this to _value later...
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def peek():
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return s[i] if i < len(s) else None
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def advance():
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i++
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def whitespace():
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while peek() in ' \r\n\t': advance()
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def string():
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if peek() != '"': raise ValueError("String should start with \" but got " + peek())
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advance()
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let out = ""
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let c = peek()
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while c != '"':
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if c is None: raise ValueError("Unterminated string")
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if c == '\\':
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advance()
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c = peek()
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if c == '"': out += '"'
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elif c == '\\': out += '\\'
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elif c == '/': out += '/'
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elif c == 'b': out += '\x08' # Backspace
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elif c == 'f': out += '\x0c' # Formfeed
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elif c == 'n': out += '\n'
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elif c == 'r': out += '\r'
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elif c == 't': out += '\t'
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elif c == 'u':
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advance()
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let sub = [0,0,0,0]
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sub[0] = peek()
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advance()
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sub[1] = peek()
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advance()
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sub[2] = peek()
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advance()
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sub[3] = peek()
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if not all([x in '0123456789abcdefABCDEF' for x in sub]):
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raise ValueError('Invalid codepoint in JSON string')
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raise NotImplementedError('TODO: unicode escapes')
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else:
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raise ValueError('Invalid escape sequence in JSON string')
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else:
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out += c
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advance()
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c = peek()
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if peek() != '"':
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raise ValueError("That was not expected.")
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advance()
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return out
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def obj():
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if peek() != '{': raise ValueError("Object should start with {?")
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advance()
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let out = {}
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whitespace()
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if peek() == '}': return out
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while True:
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whitespace()
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let k = string()
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whitespace()
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if peek() != ':': raise ValueError("Expected : after key, got " + peek())
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advance()
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let v = value()
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out[k] = v
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if peek() == '}':
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advance()
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return out
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if peek() != ',':
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raise ValueError('Expected , after value, or } for end of object.')
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advance()
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def array():
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if peek() != '[': raise ValueError("Array should start with [?")
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advance()
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let out = []
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whitespace()
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if peek() == ']': return out
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while True:
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whitespace()
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out.append(value())
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if peek() == ']':
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advance()
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return out
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if peek() != ',':
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raise ValueError("Expected , after value, or ] for end of array.")
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advance()
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def number():
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let value = 0
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let sign = 1
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if peek() == '-':
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sign = -1
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advance()
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if peek() == '0':
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advance()
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elif peek() in '0123456789':
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value = int(peek())
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advance()
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while peek() in '0123456789':
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value = value * 10
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value = value + int(peek())
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advance()
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else:
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raise ValueError("Expected digit")
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if peek() == '.':
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advance()
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let mult = 0.1
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if peek() not in '0123456789':
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raise ValueError("Expected digit")
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while peek() in '0123456789':
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value = value + multiplier * int(peek())
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multiplier = multiplier * 0.1
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advance()
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if peek() in 'eE':
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raise NotImplementedError("Exponent values are not implemented.")
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return value
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def boolean():
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let inv = ValueError("Invalid literal while parsing bool")
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if peek() == 't':
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advance()
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if peek() != 'r': raise inv
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advance()
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if peek() != 'u': raise inv
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advance()
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if peek() != 'e': raise inv
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advance()
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return True
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elif peek() == 'f':
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advance()
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if peek() != 'a': raise inv
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advance()
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if peek() != 'l': raise inv
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advance()
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if peek() != 's': raise inv
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advance()
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if peek() != 'e': raise inv
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advance()
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return False
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raise inv
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def null():
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let inv = ValueError("Invalid literal while parsing null")
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if peek() != 'n': raise inv
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advance()
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if peek() != 'u': raise inv
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advance()
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if peek() != 'l': raise inv
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advance()
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if peek() != 'l': raise inv
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advance()
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return None
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def _value():
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whitespace()
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let c = peek()
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let out = None
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if c== '"':
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out = string()
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elif c == '{':
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out = obj()
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elif c == '[':
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out = array()
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elif c == '-' or c in '0123456789':
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out = number()
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elif c == 't' or c == 'f':
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out = boolean()
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elif c == 'n':
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out = null()
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else:
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raise ValueError("Unexpected character")
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whitespace()
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return out
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value = _value
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return value()
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121
test/testJsonModule.krk
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121
test/testJsonModule.krk
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import json
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let data = '''
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{
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"glossary": {
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"title": "example glossary",
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"GlossDiv": {
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"title": "S",
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"GlossList": {
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"GlossEntry": {
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"ID": "SGML",
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"SortAs": "SGML",
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"GlossTerm": "Standard Generalized Markup Language",
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"Acronym": "SGML",
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"Abbrev": "ISO 8879:1986",
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"GlossDef": {
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"para": "A meta-markup language, used to create markup languages such as DocBook.",
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"GlossSeeAlso": ["GML", "XML"]
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},
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"GlossSee": "markup"
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}
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}
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}
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}
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}
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'''
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print(json.loads(data))
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data = '''
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{"web-app": {
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"servlet": [
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{
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"servlet-name": "cofaxCDS",
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"servlet-class": "org.cofax.cds.CDSServlet",
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"init-param": {
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"configGlossary:installationAt": "Philadelphia, PA",
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"configGlossary:adminEmail": "ksm@pobox.com",
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"configGlossary:poweredBy": "Cofax",
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"configGlossary:poweredByIcon": "/images/cofax.gif",
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"configGlossary:staticPath": "/content/static",
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"templateProcessorClass": "org.cofax.WysiwygTemplate",
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"templateLoaderClass": "org.cofax.FilesTemplateLoader",
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"templatePath": "templates",
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"templateOverridePath": "",
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"defaultListTemplate": "listTemplate.htm",
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"defaultFileTemplate": "articleTemplate.htm",
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"useJSP": false,
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"jspListTemplate": "listTemplate.jsp",
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"jspFileTemplate": "articleTemplate.jsp",
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"cachePackageTagsTrack": 200,
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"cachePackageTagsStore": 200,
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"cachePackageTagsRefresh": 60,
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"cacheTemplatesTrack": 100,
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"cacheTemplatesStore": 50,
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"cacheTemplatesRefresh": 15,
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"cachePagesTrack": 200,
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"cachePagesStore": 100,
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"cachePagesRefresh": 10,
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"cachePagesDirtyRead": 10,
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"searchEngineListTemplate": "forSearchEnginesList.htm",
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"searchEngineFileTemplate": "forSearchEngines.htm",
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"searchEngineRobotsDb": "WEB-INF/robots.db",
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"useDataStore": true,
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"dataStoreClass": "org.cofax.SqlDataStore",
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"redirectionClass": "org.cofax.SqlRedirection",
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"dataStoreName": "cofax",
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"dataStoreDriver": "com.microsoft.jdbc.sqlserver.SQLServerDriver",
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"dataStoreUrl": "jdbc:microsoft:sqlserver://LOCALHOST:1433;DatabaseName=goon",
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"dataStoreUser": "sa",
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"dataStorePassword": "dataStoreTestQuery",
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"dataStoreTestQuery": "SET NOCOUNT ON;select test='test';",
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"dataStoreLogFile": "/usr/local/tomcat/logs/datastore.log",
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"dataStoreInitConns": 10,
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"dataStoreMaxConns": 100,
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"dataStoreConnUsageLimit": 100,
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"dataStoreLogLevel": "debug",
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"maxUrlLength": 500}},
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{
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"servlet-name": "cofaxEmail",
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"servlet-class": "org.cofax.cds.EmailServlet",
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"init-param": {
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"mailHost": "mail1",
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"mailHostOverride": "mail2"}},
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{
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"servlet-name": "cofaxAdmin",
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"servlet-class": "org.cofax.cds.AdminServlet"},
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{
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"servlet-name": "fileServlet",
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"servlet-class": "org.cofax.cds.FileServlet"},
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{
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"servlet-name": "cofaxTools",
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"servlet-class": "org.cofax.cms.CofaxToolsServlet",
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"init-param": {
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"templatePath": "toolstemplates/",
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"log": 1,
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"logLocation": "/usr/local/tomcat/logs/CofaxTools.log",
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"logMaxSize": "",
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"dataLog": 1,
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"dataLogLocation": "/usr/local/tomcat/logs/dataLog.log",
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"dataLogMaxSize": "",
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"removePageCache": "/content/admin/remove?cache=pages&id=",
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"removeTemplateCache": "/content/admin/remove?cache=templates&id=",
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"fileTransferFolder": "/usr/local/tomcat/webapps/content/fileTransferFolder",
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"lookInContext": 1,
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"adminGroupID": 4,
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"betaServer": true}}],
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"servlet-mapping": {
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"cofaxCDS": "/",
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"cofaxEmail": "/cofaxutil/aemail/*",
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"cofaxAdmin": "/admin/*",
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"fileServlet": "/static/*",
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"cofaxTools": "/tools/*"},
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"taglib": {
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"taglib-uri": "cofax.tld",
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"taglib-location": "/WEB-INF/tlds/cofax.tld"}}}
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'''
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print(json.loads(data))
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2
test/testJsonModule.krk.expect
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2
test/testJsonModule.krk.expect
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{'glossary': {'title': 'example glossary', 'GlossDiv': {'title': 'S', 'GlossList': {'GlossEntry': {'SortAs': 'SGML', 'Abbrev': 'ISO 8879:1986', 'Acronym': 'SGML', 'GlossTerm': 'Standard Generalized Markup Language', 'GlossSee': 'markup', 'ID': 'SGML', 'GlossDef': {'para': 'A meta-markup language, used to create markup languages such as DocBook.', 'GlossSeeAlso': ['GML', 'XML']}}}}}}
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{'web-app': {'taglib': {'taglib-uri': 'cofax.tld', 'taglib-location': '/WEB-INF/tlds/cofax.tld'}, 'servlet': [{'servlet-class': 'org.cofax.cds.CDSServlet', 'init-param': {'templateProcessorClass': 'org.cofax.WysiwygTemplate', 'cachePagesStore': 100, 'searchEngineListTemplate': 'forSearchEnginesList.htm', 'searchEngineFileTemplate': 'forSearchEngines.htm', 'cachePackageTagsStore': 200, 'dataStoreUser': 'sa', 'dataStoreInitConns': 10, 'configGlossary:installationAt': 'Philadelphia, PA', 'cachePagesTrack': 200, 'dataStoreLogFile': '/usr/local/tomcat/logs/datastore.log', 'templateOverridePath': '', 'redirectionClass': 'org.cofax.SqlRedirection', 'cachePackageTagsTrack': 200, 'useDataStore': True, 'maxUrlLength': 500, 'dataStorePassword': 'dataStoreTestQuery', 'defaultFileTemplate': 'articleTemplate.htm', 'defaultListTemplate': 'listTemplate.htm', 'dataStoreConnUsageLimit': 100, 'templatePath': 'templates', 'useJSP': False, 'configGlossary:poweredBy': 'Cofax', 'dataStoreClass': 'org.cofax.SqlDataStore', 'dataStoreName': 'cofax', 'cacheTemplatesRefresh': 15, 'dataStoreDriver': 'com.microsoft.jdbc.sqlserver.SQLServerDriver', 'cachePagesDirtyRead': 10, 'configGlossary:adminEmail': 'ksm@pobox.com', 'dataStoreTestQuery': 'SET NOCOUNT ON;select test=\'test\';', 'cacheTemplatesStore': 50, 'templateLoaderClass': 'org.cofax.FilesTemplateLoader', 'configGlossary:staticPath': '/content/static', 'searchEngineRobotsDb': 'WEB-INF/robots.db', 'cacheTemplatesTrack': 100, 'dataStoreLogLevel': 'debug', 'dataStoreUrl': 'jdbc:microsoft:sqlserver://LOCALHOST:1433;DatabaseName=goon', 'cachePagesRefresh': 10, 'configGlossary:poweredByIcon': '/images/cofax.gif', 'dataStoreMaxConns': 100, 'jspFileTemplate': 'articleTemplate.jsp', 'cachePackageTagsRefresh': 60, 'jspListTemplate': 'listTemplate.jsp'}, 'servlet-name': 'cofaxCDS'}, {'servlet-class': 'org.cofax.cds.EmailServlet', 'init-param': {'mailHostOverride': 'mail2', 'mailHost': 'mail1'}, 'servlet-name': 'cofaxEmail'}, {'servlet-class': 'org.cofax.cds.AdminServlet', 'servlet-name': 'cofaxAdmin'}, {'servlet-class': 'org.cofax.cds.FileServlet', 'servlet-name': 'fileServlet'}, {'servlet-class': 'org.cofax.cms.CofaxToolsServlet', 'init-param': {'logMaxSize': '', 'log': 1, 'removeTemplateCache': '/content/admin/remove?cache=templates&id=', 'dataLogMaxSize': '', 'lookInContext': 1, 'adminGroupID': 4, 'removePageCache': '/content/admin/remove?cache=pages&id=', 'dataLogLocation': '/usr/local/tomcat/logs/dataLog.log', 'betaServer': True, 'fileTransferFolder': '/usr/local/tomcat/webapps/content/fileTransferFolder', 'logLocation': '/usr/local/tomcat/logs/CofaxTools.log', 'dataLog': 1, 'templatePath': 'toolstemplates/'}, 'servlet-name': 'cofaxTools'}], 'servlet-mapping': {'cofaxCDS': '/', 'fileServlet': '/static/*', 'cofaxEmail': '/cofaxutil/aemail/*', 'cofaxTools': '/tools/*', 'cofaxAdmin': '/admin/*'}}}
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