1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
#
#
# Nim's Runtime Library
# (c) Copyright 2010 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module parses an XML document and creates its XML tree representation.
import streams, parsexml, strtabs, xmltree
type
XmlError* = object of ValueError ## exception that is raised
## for invalid XML
errors*: seq[string] ## all detected parsing errors
{.deprecated: [EInvalidXml: XmlError].}
proc raiseInvalidXml(errors: seq[string]) =
var e: ref XmlError
new(e)
e.msg = errors[0]
e.errors = errors
raise e
proc addNode(father, son: XmlNode) =
if son != nil: add(father, son)
proc parse(x: var XmlParser, errors: var seq[string]): XmlNode
proc untilElementEnd(x: var XmlParser, result: XmlNode,
errors: var seq[string]) =
while true:
case x.kind
of xmlElementEnd:
if x.elementName == result.tag:
next(x)
else:
errors.add(errorMsg(x, "</" & result.tag & "> expected"))
# do not skip it here!
break
of xmlEof:
errors.add(errorMsg(x, "</" & result.tag & "> expected"))
break
else:
result.addNode(parse(x, errors))
proc parse(x: var XmlParser, errors: var seq[string]): XmlNode =
case x.kind
of xmlComment:
result = newComment(x.charData)
next(x)
of xmlCharData, xmlWhitespace:
result = newText(x.charData)
next(x)
of xmlPI, xmlSpecial:
# we just ignore processing instructions for now
next(x)
of xmlError:
errors.add(errorMsg(x))
next(x)
of xmlElementStart: ## ``<elem>``
result = newElement(x.elementName)
next(x)
untilElementEnd(x, result, errors)
of xmlElementEnd:
errors.add(errorMsg(x, "unexpected ending tag: " & x.elementName))
of xmlElementOpen:
result = newElement(x.elementName)
next(x)
result.attrs = newStringTable()
while true:
case x.kind
of xmlAttribute:
result.attrs[x.attrKey] = x.attrValue
next(x)
of xmlElementClose:
next(x)
break
of xmlError:
errors.add(errorMsg(x))
next(x)
break
else:
errors.add(errorMsg(x, "'>' expected"))
next(x)
break
untilElementEnd(x, result, errors)
of xmlAttribute, xmlElementClose:
errors.add(errorMsg(x, "<some_tag> expected"))
next(x)
of xmlCData:
result = newCData(x.charData)
next(x)
of xmlEntity:
## &entity;
result = newEntity(x.entityName)
next(x)
of xmlEof: discard
proc parseXml*(s: Stream, filename: string,
errors: var seq[string]): XmlNode =
## parses the XML from stream `s` and returns a ``PXmlNode``. Every
## occurred parsing error is added to the `errors` sequence.
var x: XmlParser
open(x, s, filename, {reportComments})
while true:
x.next()
case x.kind
of xmlElementOpen, xmlElementStart:
result = parse(x, errors)
break
of xmlComment, xmlWhitespace, xmlSpecial, xmlPI: discard # just skip it
of xmlError:
errors.add(errorMsg(x))
else:
errors.add(errorMsg(x, "<some_tag> expected"))
break
close(x)
proc parseXml*(s: Stream): XmlNode =
## parses the XTML from stream `s` and returns a ``PXmlNode``. All parsing
## errors are turned into an ``EInvalidXML`` exception.
var errors: seq[string] = @[]
result = parseXml(s, "unknown_html_doc", errors)
if errors.len > 0: raiseInvalidXml(errors)
proc loadXml*(path: string, errors: var seq[string]): XmlNode =
## Loads and parses XML from file specified by ``path``, and returns
## a ``PXmlNode``. Every occurred parsing error is added to the `errors`
## sequence.
var s = newFileStream(path, fmRead)
if s == nil: raise newException(IOError, "Unable to read file: " & path)
result = parseXml(s, path, errors)
proc loadXml*(path: string): XmlNode =
## Loads and parses XML from file specified by ``path``, and returns
## a ``PXmlNode``. All parsing errors are turned into an ``EInvalidXML``
## exception.
var errors: seq[string] = @[]
result = loadXml(path, errors)
if errors.len > 0: raiseInvalidXml(errors)
when isMainModule:
when not defined(testing):
import os
var errors: seq[string] = @[]
var x = loadXml(paramStr(1), errors)
for e in items(errors): echo e
var f: File
if open(f, "xmltest.txt", fmWrite):
f.write($x)
f.close()
else:
quit("cannot write test.txt")
else:
block: # correctly parse ../../tests/testdata/doc1.xml
let filePath = "tests/testdata/doc1.xml"
var errors: seq[string] = @[]
var xml = loadXml(filePath, errors)
assert(errors.len == 0, "The file tests/testdata/doc1.xml should be parsed without errors.")
|