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annotate light9/web/graph.coffee @ 1648:ffa3b81c6d95

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some missing askedFor auditing Ignore-this: 581b102bbdaef0dc715e61430d639e01
author Drew Perttula <drewp@bigasterisk.com>
date Sat, 10 Jun 2017 10:23:48 +0000
parents 67347c027b2a
children e00492e1c0b1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 log = console.log
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2
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3 # Patch is {addQuads: <quads>, delQuads: <quads>}
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4 # <quads> is [{subject: s, ...}, ...]
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6 # for mocha
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7 if require?
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8 `window = {}`
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9 `N3 = require('./lib/N3.js-pull61/N3.js')`
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10 `d3 = require('./lib/d3/build/d3.min.js')`
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11 `RdfDbClient = require('./rdfdbclient.js').RdfDbClient`
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12 module.exports = window
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13
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14 RDF = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
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15
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16 patchSizeSummary = (patch) ->
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17 '-' + patch.delQuads.length + ' +' + patch.addQuads.length
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18
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19 # (sloppily shared to rdfdbclient.coffee too)
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20 window.patchSizeSummary = patchSizeSummary
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21
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22 class Handler
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23 # a function and the quad patterns it cared about
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24 constructor: (@func, @label) ->
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25 @patterns = [] # s,p,o,g quads that should trigger the next run
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26 @innerHandlers = [] # Handlers requested while this one was running
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27
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28 class AutoDependencies
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29 constructor: () ->
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30 @handlers = new Handler(null) # tree of all known Handlers (at least those with non-empty patterns). Top node is not a handler.
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31 @handlerStack = [@handlers] # currently running
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33 runHandler: (func, label) ->
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34 # what if we have this func already? duplicate is safe?
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35
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36 if not label?
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37 throw new Error("missing label")
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38
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39 h = new Handler(func, label)
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40 tailChildren = @handlerStack[@handlerStack.length - 1].innerHandlers
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41 matchingLabel = _.filter(tailChildren, ((c) -> c.label == label)).length
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42 # ohno, something depends on some handlers getting run twice :(
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43 if matchingLabel < 2
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44 tailChildren.push(h)
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45 console.time("handler #{label}")
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46 @_rerunHandler(h, null)
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47 console.timeEnd("handler #{label}")
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48 @_logHandlerTree()
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49
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50 _rerunHandler: (handler, patch) ->
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51 handler.patterns = []
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52 @handlerStack.push(handler)
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53 try
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54 handler.func(patch)
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55 catch e
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56 log('error running handler: ', e)
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57 # assuming here it didn't get to do all its queries, we could
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58 # add a *,*,*,* handler to call for sure the next time?
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59 finally
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60 #log('done. got: ', handler.patterns)
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61 @handlerStack.pop()
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62 # handler might have no watches, in which case we could forget about it
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63
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64 _logHandlerTree: ->
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65 log('handler tree:')
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66 prn = (h, depth) ->
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67 indent = ''
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68 for i in [0...depth]
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69 indent += ' '
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70 log("#{indent} \"#{h.label}\" #{h.patterns.length} pats")
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71 for c in h.innerHandlers
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72 prn(c, depth + 1)
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73 prn(@handlers, 0)
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74
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75 _allPatchSubjs: (patch) ->
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76
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77 allPatchSubjs = []
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78 for stmt in patch.addQuads
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79 allPatchSubjs.push(stmt.subject)
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80 for stmt in patch.delQuads
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81 allPatchSubjs.push(stmt.subject)
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82 allPatchSubjs = _.uniq(allPatchSubjs)
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83 if _.contains(allPatchSubjs, null) or allPatchSubjs.length == 0
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84 allPatchSubjs = null
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85 log('allPatchSubjs', allPatchSubjs)
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86
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87 _handlerIsAffected: (child, allPatchSubjs) ->
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88 if allPatchSubjs == null
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89 return true
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90 if not child.patterns.length
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91 return false
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92
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93 for stmt in child.patterns
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94 if _.contains(allPatchSubjs, stmt[0])
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95 return true
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96
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97 return false
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98
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99 graphChanged: (patch) ->
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100 # SyncedGraph is telling us this patch just got applied to the graph.
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101
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102 allPatchSubjs = @_allPatchSubjs(patch)
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103
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104 rerunInners = (cur) =>
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105 toRun = cur.innerHandlers.slice()
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106 for child in toRun
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107 match = @_handlerIsAffected(child, allPatchSubjs)
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108 log('match', child.label, match)
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109 #child.innerHandlers = [] # let all children get called again
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110
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111 @_rerunHandler(child, patch)
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112 rerunInners(child)
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113 rerunInners(@handlers)
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114
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115 askedFor: (s, p, o, g) ->
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116 # SyncedGraph is telling us someone did a query that depended on
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117 # quads in the given pattern.
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118 current = @handlerStack[@handlerStack.length - 1]
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119 if current? and current != @handlers
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120 current.patterns.push([s, p, o, g])
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121 #log('push', s,p,o,g)
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122
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123 class window.SyncedGraph
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124 # Main graph object for a browser to use. Syncs both ways with
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125 # rdfdb. Meant to hide the choice of RDF lib, so we can change it
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126 # later.
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127 #
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128 # Note that _applyPatch is the only method to write to the graph, so
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129 # it can fire subscriptions.
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130
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131 constructor: (@patchSenderUrl, @prefixes, @setStatus) ->
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132 # patchSenderUrl is the /syncedGraph path of an rdfdb server.
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133 # prefixes can be used in Uri(curie) calls.
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134 @_autoDeps = new AutoDependencies() # replaces GraphWatchers
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135 @clearGraph()
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136
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137 if @patchSenderUrl
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138 @_client = new RdfDbClient(@patchSenderUrl, @_clearGraphOnNewConnection.bind(@),
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139 @_applyPatch.bind(@), @setStatus)
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140
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141 clearGraph: ->
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142 # just deletes the statements; watchers are unaffected.
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143 if @graph?
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144 @_applyPatch({addQuads: [], delQuads: @graph.find()})
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145
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146 # if we had a Store already, this lets N3.Store free all its indices/etc
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147 @graph = N3.Store()
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148 @_addPrefixes(@prefixes)
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149 @cachedFloatValues = new Map();
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150
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151 _clearGraphOnNewConnection: -> # must not send a patch to the server!
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152 log('graph: clearGraphOnNewConnection')
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153 @clearGraph()
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154 log('graph: clearGraphOnNewConnection done')
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155
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156 _addPrefixes: (prefixes) ->
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157 @graph.addPrefixes(prefixes)
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158
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159 Uri: (curie) ->
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160 N3.Util.expandPrefixedName(curie, @graph._prefixes)
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161
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162 Literal: (jsValue) ->
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163 N3.Util.createLiteral(jsValue)
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164
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165 LiteralRoundedFloat: (f) ->
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166 N3.Util.createLiteral(d3.format(".3f")(f),
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167 "http://www.w3.org/2001/XMLSchema#decimal")
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168
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169 toJs: (literal) ->
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170 # incomplete
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171 parseFloat(N3.Util.getLiteralValue(literal))
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172
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173 loadTrig: (trig, cb) -> # for debugging
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174 patch = {delQuads: [], addQuads: []}
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175 parser = N3.Parser()
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176 parser.parse trig, (error, quad, prefixes) =>
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177 if (quad)
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178 patch.addQuads.push(quad)
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179 else
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180 @_applyPatch(patch)
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181 @_addPrefixes(prefixes)
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182 cb() if cb
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183
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184 quads: () -> # for debugging
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185 [q.subject, q.predicate, q.object, q.graph] for q in @graph.find()
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186
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187 applyAndSendPatch: (patch) ->
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188 console.time('applyAndSendPatch')
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189 if !Array.isArray(patch.addQuads) || !Array.isArray(patch.delQuads)
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190 throw new Error("corrupt patch: #{JSON.stringify(patch)}")
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191
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192 for qs in [patch.addQuads, patch.delQuads]
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193 for q in qs
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194 if not q.graph?
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195 throw new Error("corrupt patch: #{JSON.stringify(q)}")
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196
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197 @_applyPatch(patch)
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198 @_client.sendPatch(patch) if @_client
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199 console.timeEnd('applyAndSendPatch')
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200
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201 _applyPatch: (patch) ->
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202 # In most cases you want applyAndSendPatch.
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203 #
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204 # This is the only method that writes to @graph!
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205 @cachedFloatValues.clear()
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206 for quad in patch.delQuads
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207 @graph.removeTriple(quad)
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208 for quad in patch.addQuads
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209 @graph.addTriple(quad)
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210 #log('applied patch locally', patchSizeSummary(patch))
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211 @_autoDeps.graphChanged(patch)
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212
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213 getObjectPatch: (s, p, newObject, g) ->
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214 # make a patch which removes existing values for (s,p,*,c) and
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215 # adds (s,p,newObject,c). Values in other graphs are not affected.
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216 existing = @graph.findByIRI(s, p, null, g)
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217 return {
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218 delQuads: existing,
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219 addQuads: [{subject: s, predicate: p, object: newObject, graph: g}]
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220 }
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221
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222 patchObject: (s, p, newObject, g) ->
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223 @applyAndSendPatch(@getObjectPatch(s, p, newObject, g))
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224
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225 runHandler: (func, label) ->
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226 # runs your func once, tracking graph calls. if a future patch
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227 # matches what you queried, we runHandler your func again (and
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228 # forget your queries from the first time).
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229
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230 # helps with memleak? not sure yet. The point was if two matching
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231 # labels get puushed on, we should run only one. So maybe
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232 # appending a serial number is backwards.
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233 @serial = 1 if not @serial
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234 @serial += 1
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235 #label = label + @serial
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236
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237 @_autoDeps.runHandler(func, label)
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238
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239 _singleValue: (s, p) ->
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240 @_autoDeps.askedFor(s, p, null, null)
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241 quads = @graph.findByIRI(s, p)
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242 objs = new Set(q.object for q in quads)
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243
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244 switch objs.size
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245 when 0
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246 throw new Error("no value for "+s+" "+p)
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247 when 1
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248 obj = objs.values().next().value
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249 return obj
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250 else
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251 throw new Error("too many different values: " + JSON.stringify(quads))
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252
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253 floatValue: (s, p) ->
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254 key = s + '|' + p
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255 hit = @cachedFloatValues.get(key)
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256 return hit if hit != undefined
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257 #log('float miss', s, p)
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258
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259 ret = parseFloat(N3.Util.getLiteralValue(@_singleValue(s, p)))
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260 @cachedFloatValues.set(key, ret)
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261 return ret
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262
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263 stringValue: (s, p) ->
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264 N3.Util.getLiteralValue(@_singleValue(s, p))
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265
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266 uriValue: (s, p) ->
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267 @_singleValue(s, p)
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268
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269 labelOrTail: (uri) ->
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270 try
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271 @graph.stringValue(uri, @graph.Uri('rdfs:label'))
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272 catch
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273 words = uri.split('/')
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274 words[words.length-1]
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275
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276 objects: (s, p) ->
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277 @_autoDeps.askedFor(s, p, null, null)
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278 quads = @graph.findByIRI(s, p)
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279 return (q.object for q in quads)
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280
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281 subjects: (p, o) ->
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282 @_autoDeps.askedFor(null, p, o, null)
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283 quads = @graph.findByIRI(null, p, o)
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284 return (q.subject for q in quads)
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285
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286 items: (list) ->
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287 out = []
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288 current = list
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289 while true
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290 if current == RDF + 'nil'
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291 break
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292
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293 @_autoDeps.askedFor(current, null, null, null) # a little loose
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294
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295 firsts = @graph.findByIRI(current, RDF + 'first', null)
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296 rests = @graph.findByIRI(current, RDF + 'rest', null)
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297 if firsts.length != 1
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298 throw new Error("list node #{current} has #{firsts.length} rdf:first edges")
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299 out.push(firsts[0].object)
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diff changeset
300
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
301 if rests.length != 1
233b81d9bd9d simple first version of SyncedGraph.runHandler
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302 throw new Error("list node #{current} has #{rests.length} rdf:rest edges")
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303 current = rests[0].object
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304
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
305 return out
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306
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307 contains: (s, p, o) ->
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diff changeset
308 @_autoDeps.askedFor(s, p, o, null)
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309 return @graph.findByIRI(s, p, o).length > 0
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310
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diff changeset
311 nextNumberedResources: (base, howMany) ->
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diff changeset
312 results = []
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diff changeset
313 # we could cache [base,lastSerial]
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diff changeset
314 for serial in [0..1000]
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diff changeset
315 uri = @Uri("#{base}#{serial}")
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diff changeset
316 if not @contains(uri, null, null)
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diff changeset
317 results.push(uri)
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diff changeset
318 if results.length >= howMany
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diff changeset
319 return results
26fabcf3a0a8 relocate nextNumberedResource to SyncedGraph
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diff changeset
320 throw new Error("can't make sequential uri with base #{base}")
1363
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diff changeset
321
1387
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diff changeset
322 nextNumberedResource: (base) ->
26fabcf3a0a8 relocate nextNumberedResource to SyncedGraph
Drew Perttula <drewp@bigasterisk.com>
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diff changeset
323 @nextNumberedResources(base, 1)[0]
26fabcf3a0a8 relocate nextNumberedResource to SyncedGraph
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parents: 1386
diff changeset
324
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Drew Perttula <drewp@bigasterisk.com>
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diff changeset
325 contextsWithPattern: (s, p, o) ->
1648
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Drew Perttula <drewp@bigasterisk.com>
parents: 1647
diff changeset
326 @_autoDeps.askedFor(s, p, o, null)
1591
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Drew Perttula <drewp@bigasterisk.com>
parents: 1537
diff changeset
327 ctxs = []
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diff changeset
328 for q in @graph.find(s, p, o)
2713d2f7a0fc resource-display can have a rename button for editing rdfs:label
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diff changeset
329 ctxs.push(q.graph)
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diff changeset
330 return _.unique(ctxs)
2713d2f7a0fc resource-display can have a rename button for editing rdfs:label
Drew Perttula <drewp@bigasterisk.com>
parents: 1537
diff changeset
331