Use Draft4 JSON Schema for both v3 and v4

no longer need jsonpointer

IPython/nbformat/v3/nbformat.v3.schema.json

@@ -0,0 +1,363 b''
+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "description": "IPython Notebook v3.0 JSON schema.",
+    "type": "object",
+    "additionalProperties": false,
+    "required": ["metadata", "nbformat_minor", "nbformat", "worksheets"],
+    "properties": {
+        "metadata": {
+            "description": "Notebook root-level metadata.",
+            "type": "object",
+            "additionalProperties": true,
+            "properties": {
+                "kernel_info": {
+                    "description": "Kernel information.",
+                    "type": "object",
+                    "required": ["name", "language"],
+                    "properties": {
+                        "name": {
+                            "description": "Name of the kernel specification.",
+                            "type": "string"
+                        },
+                        "language": {
+                            "description": "The programming language which this kernel runs.",
+                            "type": "string"
+                        },
+                        "codemirror_mode": {
+                            "description": "The codemirror mode to use for code in this language.",
+                            "type": "string"
+                        }
+                    }
+                },
+                "signature": {
+                    "description": "Hash of the notebook.",
+                    "type": "string"
+                }
+            }
+        },
+        "nbformat_minor": {
+            "description": "Notebook format (minor number). Incremented for backward compatible changes to the notebook format.",
+            "type": "integer",
+            "minimum": 0
+        },
+        "nbformat": {
+            "description": "Notebook format (major number). Incremented between backwards incompatible changes to the notebook format.",
+            "type": "integer",
+            "minimum": 3,
+            "maximum": 3
+        },
+        "orig_nbformat": {
+            "description": "Original notebook format (major number) before converting the notebook between versions.",
+            "type": "integer",
+            "minimum": 1
+        },
+        "worksheets" : {
+            "description": "Array of worksheets",
+            "type": "array",
+            "items": {"$ref": "#/definitions/worksheet"}
+        }
+    },
+
+    "definitions": {
+        "worksheet": {
+            "additionalProperties": false,
+            "required" : ["cells"],
+            "properties":{
+                "cells": {
+                    "description": "Array of cells of the current notebook.",
+                    "type": "array",
+                    "items": {
+                        "type": "object",
+                        "oneOf": [
+                            {"$ref": "#/definitions/raw_cell"},
+                            {"$ref": "#/definitions/markdown_cell"},
+                            {"$ref": "#/definitions/heading_cell"},
+                            {"$ref": "#/definitions/code_cell"}
+                        ]
+                    }
+                },
+                "metadata": {
+                    "type": "object",
+                    "description": "metadata of the current worksheet"
+                }
+            }
+        },
+        "raw_cell": {
+            "description": "Notebook raw nbconvert cell.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["cell_type", "source"],
+            "properties": {
+                "cell_type": {
+                    "description": "String identifying the type of cell.",
+                    "enum": ["raw"]
+                },
+                "metadata": {
+                    "description": "Cell-level metadata.",
+                    "type": "object",
+                    "additionalProperties": true,
+                    "properties": {
+                        "format": {
+                            "description": "Raw cell metadata format for nbconvert.",
+                            "type": "string"
+                        },
+                        "name": {"$ref": "#/definitions/misc/metadata_name"},
+                        "tags": {"$ref": "#/definitions/misc/metadata_tags"}
+                    }
+                },
+                "source": {"$ref": "#/definitions/misc/source"}
+            }
+        },
+
+        "markdown_cell": {
+            "description": "Notebook markdown cell.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["cell_type", "source"],
+            "properties": {
+                "cell_type": {
+                    "description": "String identifying the type of cell.",
+                    "enum": ["markdown"]
+                },
+                "metadata": {
+                    "description": "Cell-level metadata.",
+                    "type": "object",
+                    "properties": {
+                        "name": {"$ref": "#/definitions/misc/metadata_name"},
+                        "tags": {"$ref": "#/definitions/misc/metadata_tags"}
+                    },
+                    "additionalProperties": true
+                },
+                "source": {"$ref": "#/definitions/misc/source"}
+            }
+        },
+
+        "heading_cell": {
+            "description": "Notebook heading cell.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["cell_type", "source", "level"],
+            "properties": {
+                "cell_type": {
+                    "description": "String identifying the type of cell.",
+                    "enum": ["heading"]
+                },
+                "metadata": {
+                    "description": "Cell-level metadata.",
+                    "type": "object",
+                    "additionalProperties": true
+                },
+                "source": {"$ref": "#/definitions/misc/source"},
+                "level": {
+                    "description": "Level of heading cells.",
+                    "type": "integer",
+                    "minimum": 1
+                }
+            }
+        },
+
+        "code_cell": {
+            "description": "Notebook code cell.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["cell_type", "input", "outputs", "collapsed", "language"],
+            "properties": {
+                "cell_type": {
+                    "description": "String identifying the type of cell.",
+                    "enum": ["code"]
+                },
+                "language": {
+                    "description": "The cell's language (always Python)",
+                    "type": "string"
+                },
+                "collapsed": {
+                    "description": "Whether the cell is collapsed/expanded.",
+                    "type": "boolean"
+                },
+                "metadata": {
+                    "description": "Cell-level metadata.",
+                    "type": "object",
+                    "additionalProperties": true
+                },
+                "input": {"$ref": "#/definitions/misc/source"},
+                "outputs": {
+                    "description": "Execution, display, or stream outputs.",
+                    "type": "array",
+                    "items": {"$ref": "#/definitions/output"}
+                },
+                "prompt_number": {
+                    "description": "The code cell's prompt number. Will be null if the cell has not been run.",
+                    "type": ["integer", "null"],
+                    "minimum": 0
+                }
+            }
+        },
+        "output": {
+            "type": "object",
+            "oneOf": [
+                {"$ref": "#/definitions/pyout"},
+                {"$ref": "#/definitions/display_data"},
+                {"$ref": "#/definitions/stream"},
+                {"$ref": "#/definitions/pyerr"}
+            ]
+        },
+        "pyout": {
+            "description": "Result of executing a code cell.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["output_type", "prompt_number"],
+            "properties": {
+                "output_type": {
+                    "description": "Type of cell output.",
+                    "enum": ["pyout"]
+                },
+                "prompt_number": {
+                    "description": "A result's prompt number.",
+                    "type": ["integer"],
+                    "minimum": 0
+                },
+                "text": {"$ref": "#/definitions/misc/multiline_string"},
+                "latex": {"$ref": "#/definitions/misc/multiline_string"},
+                "png": {"$ref": "#/definitions/misc/multiline_string"},
+                "jpeg": {"$ref": "#/definitions/misc/multiline_string"},
+                "svg": {"$ref": "#/definitions/misc/multiline_string"},
+                "html": {"$ref": "#/definitions/misc/multiline_string"},
+                "javascript": {"$ref": "#/definitions/misc/multiline_string"},
+                "json": {"$ref": "#/definitions/misc/multiline_string"},
+                "pdf": {"$ref": "#/definitions/misc/multiline_string"},
+                "metadata": {"$ref": "#/definitions/misc/output_metadata"}
+            },
+            "patternProperties": {
+                "^[a-zA-Z0-9]+/[a-zA-Z0-9\\-\\+\\.]+$": {
+                    "description": "mimetype output (e.g. text/plain), represented as either an array of strings or a string.",
+                    "$ref": "#/definitions/misc/multiline_string"
+                }
+            }
+        },
+
+        "display_data": {
+            "description": "Data displayed as a result of code cell execution.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["output_type"],
+            "properties": {
+                "output_type": {
+                    "description": "Type of cell output.",
+                    "enum": ["display_data"]
+                },
+                "text": {"$ref": "#/definitions/misc/multiline_string"},
+                "latex": {"$ref": "#/definitions/misc/multiline_string"},
+                "png": {"$ref": "#/definitions/misc/multiline_string"},
+                "jpeg": {"$ref": "#/definitions/misc/multiline_string"},
+                "svg": {"$ref": "#/definitions/misc/multiline_string"},
+                "html": {"$ref": "#/definitions/misc/multiline_string"},
+                "javascript": {"$ref": "#/definitions/misc/multiline_string"},
+                "json": {"$ref": "#/definitions/misc/multiline_string"},
+                "pdf": {"$ref": "#/definitions/misc/multiline_string"},
+                "metadata": {"$ref": "#/definitions/misc/output_metadata"}
+            },
+            "patternProperties": {
+                "[a-zA-Z0-9]+/[a-zA-Z0-9\\-\\+\\.]+$": {
+                    "description": "mimetype output (e.g. text/plain), represented as either an array of strings or a string.",
+                    "$ref": "#/definitions/misc/multiline_string"
+                }
+            }
+        },
+
+        "stream": {
+            "description": "Stream output from a code cell.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["output_type", "stream", "text"],
+            "properties": {
+                "output_type": {
+                    "description": "Type of cell output.",
+                    "enum": ["stream"]
+                },
+                "stream": {
+                    "description": "The stream type/destination.",
+                    "type": "string"
+                },
+                "text": {
+                    "description": "The stream's text output, represented as an array of strings.",
+                    "$ref": "#/definitions/misc/multiline_string"
+                }
+            }
+        },
+
+        "pyerr": {
+            "description": "Output of an error that occurred during code cell execution.",
+            "type": "object",
+            "additionalProperties": false,
+            "required": ["output_type", "ename", "evalue", "traceback"],
+            "properties": {
+                "output_type": {
+                    "description": "Type of cell output.",
+                    "enum": ["pyerr"]
+                },
+                "metadata": {"$ref": "#/definitions/misc/output_metadata"},
+                "ename": {
+                    "description": "The name of the error.",
+                    "type": "string"
+                },
+                "evalue": {
+                    "description": "The value, or message, of the error.",
+                    "type": "string"
+                },
+                "traceback": {
+                    "description": "The error's traceback, represented as an array of strings.",
+                    "type": "array",
+                    "items": {"type": "string"}
+                }
+            }
+        },
+
+        "misc": {
+            "metadata_name": {
+                "description": "The cell's name. If present, must be a non-empty string.",
+                "type": "string",
+                "pattern": "^.+$"
+            },
+            "metadata_tags": {
+                "description": "The cell's tags. Tags must be unique, and must not contain commas.",
+                "type": "array",
+                "uniqueItems": true,
+                "items": {
+                    "type": "string",
+                    "pattern": "^[^,]+$"
+                }
+            },
+            "source": {
+                "description": "Contents of the cell, represented as an array of lines.",
+                "$ref": "#/definitions/misc/multiline_string"
+            },
+            "prompt_number": {
+                "description": "The code cell's prompt number. Will be null if the cell has not been run.",
+                "type": ["integer", "null"],
+                "minimum": 0
+            },
+            "mimetype": {
+                "patternProperties": {
+                    "^[a-zA-Z0-9\\-\\+]+/[a-zA-Z0-9\\-\\+]+": {
+                        "description": "The cell's mimetype output (e.g. text/plain), represented as either an array of strings or a string.",
+                        "$ref": "#/definitions/misc/multiline_string"
+                    }
+                }
+            },
+            "output_metadata": {
+                "description": "Cell output metadata.",
+                "type": "object",
+                "additionalProperties": true
+            },
+            "multiline_string": {
+                "oneOf" : [
+                    {"type": "string"},
+                    {
+                        "type": "array",
+                        "items": {"type": "string"}
+                    }
+                ]
+            }
+        }
+    }
+}

IPython/nbformat/current.py

@@ -1,5 +1,8 b''
 """The official API for working with notebooks in the current format version."""
 
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
 from __future__ import print_function
 
 import re
@@ -17,7 +20,7 b' from IPython.nbformat import v3 as _v_latest'
 from .reader import reads as reader_reads
 from .reader import versions
 from .convert import convert
-from .validator import validate
+from .validator import validate, ValidationError
 
 from IPython.utils.log import get_logger
 
@@ -60,11 +63,10 b' def reads_json(nbjson, **kwargs):'
     """
     nb = reader_reads(nbjson, **kwargs)
     nb_current = convert(nb, current_nbformat)
-    errors = validate(nb_current)
-    if errors:
-        get_logger().error(
-            "Notebook JSON is invalid (%d errors detected during read)",
-            len(errors))
+    try:
+        validate(nb_current)
+    except ValidationError as e:
+        get_logger().error("Notebook JSON is invalid: %s", e)
     return nb_current
 
 
@@ -73,11 +75,10 b' def writes_json(nb, **kwargs):'
     any JSON format errors are detected.
 
     """
-    errors = validate(nb)
-    if errors:
-        get_logger().error(
-            "Notebook JSON is invalid (%d errors detected during write)",
-            len(errors))
+    try:
+        validate(nb)
+    except ValidationError as e:
+        get_logger().error("Notebook JSON is invalid: %s", e)
     nbjson = versions[current_nbformat].writes_json(nb, **kwargs)
     return nbjson
 

IPython/nbformat/tests/test_validator.py

@@ -1,23 +1,14 b''
-"""
-Contains tests class for validator.py
-"""
-#-----------------------------------------------------------------------------
-#  Copyright (C) 2014  The IPython Development Team
-#
-#  Distributed under the terms of the BSD License.  The full license is in
-#  the file COPYING, distributed as part of this software.
-#-----------------------------------------------------------------------------
+"""Test nbformat.validator"""
 
-#-----------------------------------------------------------------------------
-# Imports
-#-----------------------------------------------------------------------------
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
 
 import os
 
 from .base import TestsBase
-from jsonschema import SchemaError
+from jsonschema import ValidationError
 from ..current import read
-from ..validator import schema_path, isvalid, validate, resolve_ref
+from ..validator import isvalid, validate
 
 
 #-----------------------------------------------------------------------------
@@ -26,22 +17,18 b' from ..validator import schema_path, isvalid, validate, resolve_ref'
 
 class TestValidator(TestsBase):
 
-    def test_schema_path(self):
-        """Test that the schema path exists"""
-        self.assertEqual(os.path.exists(schema_path), True)
-
     def test_nb2(self):
         """Test that a v2 notebook converted to v3 passes validation"""
         with self.fopen(u'test2.ipynb', u'r') as f:
             nb = read(f, u'json')
-        self.assertEqual(validate(nb), [])
+        validate(nb)
         self.assertEqual(isvalid(nb), True)
 
     def test_nb3(self):
         """Test that a v3 notebook passes validation"""
         with self.fopen(u'test3.ipynb', u'r') as f:
             nb = read(f, u'json')
-        self.assertEqual(validate(nb), [])
+        validate(nb)
         self.assertEqual(isvalid(nb), True)
 
     def test_invalid(self):
@@ -52,22 +39,7 b' class TestValidator(TestsBase):'
         # - one cell has an invalid level
         with self.fopen(u'invalid.ipynb', u'r') as f:
             nb = read(f, u'json')
-        self.assertEqual(len(validate(nb)), 3)
+        with self.assertRaises(ValidationError):
+            validate(nb)
         self.assertEqual(isvalid(nb), False)
 
-    def test_resolve_ref(self):
-        """Test that references are correctly resolved"""
-        # make sure it resolves the ref correctly
-        json = {"abc": "def", "ghi": {"$ref": "/abc"}}
-        resolved = resolve_ref(json)
-        self.assertEqual(resolved, {"abc": "def", "ghi": "def"})
-
-        # make sure it throws an error if the ref is not by itself
-        json = {"abc": "def", "ghi": {"$ref": "/abc", "foo": "bar"}}
-        with self.assertRaises(SchemaError):
-            resolved = resolve_ref(json)
-
-        # make sure it can handle json with no reference
-        json = {"abc": "def"}
-        resolved = resolve_ref(json)
-        self.assertEqual(resolved, json)

IPython/nbformat/v3/nbbase.py

@@ -22,7 +22,7 b' from IPython.utils.py3compat import cast_unicode, unicode_type'
 # Change this when incrementing the nbformat version
 nbformat = 3
 nbformat_minor = 0
-nbformat_schema = 'v3.withref.json'
+nbformat_schema = 'nbformat.v3.schema.json'
 
 class NotebookNode(Struct):
     pass

IPython/nbformat/validator.py

@@ -1,112 +1,72 b''
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
 from __future__ import print_function
 import json
 import os
 
 try:
-    from jsonschema import SchemaError
-    from jsonschema import Draft3Validator as Validator
+    from jsonschema import ValidationError
+    from jsonschema import Draft4Validator as Validator
 except ImportError as e:
     verbose_msg = """
 
-    IPython depends on the jsonschema package: https://pypi.python.org/pypi/jsonschema
+    IPython notebook format depends on the jsonschema package:
     
-    Please install it first.
-    """
-    raise ImportError(str(e) + verbose_msg)
-
-try:
-    import jsonpointer as jsonpointer
-except ImportError as e:
-    verbose_msg = """
-
-    IPython depends on the jsonpointer package: https://pypi.python.org/pypi/jsonpointer
+        https://pypi.python.org/pypi/jsonschema
     
     Please install it first.
     """
     raise ImportError(str(e) + verbose_msg)
 
-from IPython.utils.py3compat import iteritems
+from IPython.utils.importstring import import_item
+
 
+validators = {}
 
-from .current import nbformat, nbformat_schema
-schema_path = os.path.join(
-    os.path.dirname(__file__), "v%d" % nbformat, nbformat_schema)
+def get_validator(version=None):
+    """Load the JSON schema into a Validator"""
+    if version is None:
+        from .current import nbformat as version
 
+    if version not in validators:
+        v = import_item("IPython.nbformat.v%s" % version)
+        schema_path = os.path.join(os.path.dirname(v.__file__), v.nbformat_schema)
+        with open(schema_path) as f:
+            schema_json = json.load(f)
+        validators[version] = Validator(schema_json)
+    return validators[version]
 
-def isvalid(nbjson):
+def isvalid(nbjson, ref=None, version=None):
     """Checks whether the given notebook JSON conforms to the current
     notebook format schema. Returns True if the JSON is valid, and
     False otherwise.
 
     To see the individual errors that were encountered, please use the
     `validate` function instead.
-
     """
-
-    errors = validate(nbjson)
-    return errors == []
+    try:
+        validate(nbjson, ref, version)
+    except ValidationError:
+        return False
+    else:
+        return True
 
 
-def validate(nbjson):
+def validate(nbjson, ref=None, version=None):
     """Checks whether the given notebook JSON conforms to the current
-    notebook format schema, and returns the list of errors.
-
-    """
-
-    # load the schema file
-    with open(schema_path, 'r') as fh:
-        schema_json = json.load(fh)
-
-    # resolve internal references
-    schema = resolve_ref(schema_json)
-    schema = jsonpointer.resolve_pointer(schema, '/notebook')
-
-    # count how many errors there are
-    v = Validator(schema)
-    errors = list(v.iter_errors(nbjson))
-    return errors
-
-
-def resolve_ref(json, schema=None):
-    """Resolve internal references within the given JSON. This essentially
-    means that dictionaries of this form:
-
-    {"$ref": "/somepointer"}
-
-    will be replaced with the resolved reference to `/somepointer`.
-    This only supports local reference to the same JSON file.
+    notebook format schema.
 
+    Raises ValidationError if not valid.
     """
+    if version is None:
+        from .current import nbformat
+        version = nbjson.get('nbformat', nbformat)
 
-    if not schema:
-        schema = json
-
-    # if it's a list, resolve references for each item in the list
-    if type(json) is list:
-        resolved = []
-        for item in json:
-            resolved.append(resolve_ref(item, schema=schema))
-
-    # if it's a dictionary, resolve references for each item in the
-    # dictionary
-    elif type(json) is dict:
-        resolved = {}
-        for key, ref in iteritems(json):
-
-            # if the key is equal to $ref, then replace the entire
-            # dictionary with the resolved value
-            if key == '$ref':
-                if len(json) != 1:
-                    raise SchemaError(
-                        "objects containing a $ref should only have one item")
-                pointer = jsonpointer.resolve_pointer(schema, ref)
-                resolved = resolve_ref(pointer, schema=schema)
-
-            else:
-                resolved[key] = resolve_ref(ref, schema=schema)
+    validator = get_validator(version)
 
-    # otherwise it's a normal object, so just return it
+    if ref:
+        return validator.validate(nbjson, {'$ref' : '#/definitions/%s' % ref})
     else:
-        resolved = json
+        return validator.validate(nbjson)
 
-    return resolved

IPython/testing/iptestcontroller.py

@@ -218,7 +218,7 b' def all_js_groups():'
 class JSController(TestController):
     """Run CasperJS tests """
     requirements =  ['zmq', 'tornado', 'jinja2', 'casperjs', 'sqlite3',
-                     'jsonschema', 'jsonpointer']
+                     'jsonschema']
     display_slimer_output = False
 
     def __init__(self, section, xunit=True, engine='phantomjs'):

setup.py

@@ -275,7 +275,7 b' extras_require = dict('
     doc = ['Sphinx>=1.1', 'numpydoc'],
     test = ['nose>=0.10.1'],
     terminal = [],
-    nbformat = ['jsonschema>=2.0', 'jsonpointer>=1.3'],
+    nbformat = ['jsonschema>=2.0'],
     notebook = ['tornado>=3.1', 'pyzmq>=2.1.11', 'jinja2', 'pygments', 'mistune>=0.3.1'],
     nbconvert = ['pygments', 'jinja2', 'mistune>=0.3.1']
 )

setupbase.py

@@ -194,7 +194,10 b' def find_package_data():'
                 'preprocessors/tests/files/*.*',
             ],
         'IPython.nbconvert.filters' : ['marked.js'],
-        'IPython.nbformat' : ['tests/*.ipynb','v3/v3.withref.json']
+        'IPython.nbformat' : [
+            'tests/*.ipynb',
+            'v3/nbformat.v3.schema.json',
+            ]
     }
     
     return package_data