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annotate light9/web/graph.coffee @ 1363:233b81d9bd9d

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simple first version of SyncedGraph.runHandler Ignore-this: bbe6aa9fe4edd0de1564b57c1077e711
author Drew Perttula <drewp@bigasterisk.com>
date Mon, 06 Jun 2016 05:57:30 +0000
parents 168262618f2d
children ca5b10d7ecd1
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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5
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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-1d2d975c10ad3252d38393c3ea97b36fd3ab986a/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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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 # partial port of autodepgraphapi.py
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23 class GraphWatchers # throw this one away; use AutoDependencies
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24 constructor: ->
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25 @handlersSp = {} # {s: {p: [handlers]}}
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26 subscribe: (s, p, o, onChange) -> # return subscription handle
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27 if o? then throw Error('not implemented')
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28 if not @handlersSp[s]
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29 @handlersSp[s] = {}
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30 if not @handlersSp[s][p]
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31 @handlersSp[s][p] = []
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32 @handlersSp[s][p].push(onChange)
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33 handle = {s: s, p: p, func: onChange}
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34 return handle
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35
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36 unsubscribe: (subscription) ->
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37 spList = @handlersSp[subscription.s][subscription.p]
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38 i = spList.indexOf(subscription.func)
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39 if i == -1
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40 throw new Error('subscription not found')
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41 spList.splice(i, 1)
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42
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43 matchingHandlers: (quad) ->
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44 matches = []
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45 for subjDict in [@handlersSp[quad.subject] || {}, @handlersSp[null] || {}]
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46 for subjPredMatches in [subjDict[quad.predicate] || [], subjDict[null] || []]
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47 matches = matches.concat(subjPredMatches)
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48 return matches
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49
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50 graphChanged: (patch) ->
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51 for quad in patch.delQuads
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52 for cb in @matchingHandlers(quad)
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53 # currently calls multiple times, which is ok, but we might
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54 # group things into fewer patches
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55 cb({delQuads: [quad], addQuads: []})
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56 for quad in patch.addQuads
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57 for cb in @matchingHandlers(quad)
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58 cb({delQuads: [], addQuads: [quad]})
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59
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60 class Handler
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61 # a function and the quad patterns it cared about
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62 constructor: (@func) ->
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63 patterns = [] # s,p,o,g quads that should trigger the next run
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64
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65 class AutoDependencies
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66 constructor: () ->
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67 @handlers = [] # all known Handlers (at least those with non-empty patterns)
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68 @handlerStack = [] # currently running
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69
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70 runHandler: (func) ->
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71 # what if we have this func already? duplicate is safe?
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72
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73 h = new Handler(func)
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74 @handlers.push(h)
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75 @_rerunHandler(h)
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76
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77 _rerunHandler: (handler) ->
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78 handler.patterns = []
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79 @handlerStack.push(handler)
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80 try
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81 handler.func()
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82 catch e
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83 log('error running handler: ', e)
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84 # assuming here it didn't get to do all its queries, we could
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85 # add a *,*,*,* handler to call for sure the next time?
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86 finally
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87 #log('done. got: ', handler.patterns)
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88 @handlerStack.pop()
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89 # handler might have no watches, in which case we could forget about it
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90
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91 graphChanged: (patch) ->
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92 # SyncedGraph is telling us this patch just got applied to the graph.
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93 for h in @handlers
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94 @_rerunHandler(h)
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95
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96 askedFor: (s, p, o, g) ->
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97 # SyncedGraph is telling us someone did a query that depended on
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98 # quads in the given pattern.
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99 current = @handlerStack[@handlerStack.length - 1]
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100 if current?
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101 current.patterns.push([s, p, o, g])
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102 #log('push', s,p,o,g)
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103
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104 class window.SyncedGraph
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105 # Main graph object for a browser to use. Syncs both ways with
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106 # rdfdb. Meant to hide the choice of RDF lib, so we can change it
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107 # later.
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108 #
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109 # Note that _applyPatch is the only method to write to the graph, so
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110 # it can fire subscriptions.
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111
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112 constructor: (@patchSenderUrl, @prefixes, @setStatus) ->
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113 # patchSenderUrl is the /syncedGraph path of an rdfdb server.
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114 # prefixes can be used in Uri(curie) calls.
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115 @_watchers = new GraphWatchers() # old
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116 @_autoDeps = new AutoDependencies() # replaces GraphWatchers
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117 @clearGraph()
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118
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119 if @patchSenderUrl
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120 @_client = new RdfDbClient(@patchSenderUrl, @clearGraph.bind(@),
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121 @_applyPatch.bind(@), @setStatus)
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122
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123 clearGraph: -> # for debugging
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124 # just deletes the statements; watchers are unaffected.
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125 if @graph?
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126 @_applyPatch({addQuads: [], delQuads: @graph.find()})
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127
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128 # if we had a Store already, this lets N3.Store free all its indices/etc
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129 @graph = N3.Store()
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130 @_addPrefixes(@prefixes)
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diff changeset
131
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132
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133 _addPrefixes: (prefixes) ->
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134 @graph.addPrefixes(prefixes)
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135
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136 Uri: (curie) ->
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137 N3.Util.expandPrefixedName(curie, @graph._prefixes)
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138
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139 Literal: (jsValue) ->
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140 N3.Util.createLiteral(jsValue)
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141
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142 LiteralRoundedFloat: (f) ->
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143 N3.Util.createLiteral(d3.format(".3f")(f),
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144 "http://www.w3.org/2001/XMLSchema#decimal")
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145
1317
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146 toJs: (literal) ->
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147 # incomplete
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148 parseFloat(N3.Util.getLiteralValue(literal))
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149
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150 loadTrig: (trig, cb) -> # for debugging
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151 patch = {delQuads: [], addQuads: []}
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152 parser = N3.Parser()
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153 parser.parse trig, (error, quad, prefixes) =>
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154 if (quad)
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155 patch.addQuads.push(quad)
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156 else
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157 @_applyPatch(patch)
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158 @_addPrefixes(prefixes)
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159 cb() if cb
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160
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161 quads: () -> # for debugging
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162 [q.subject, q.predicate, q.object, q.graph] for q in @graph.find()
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163
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164 applyAndSendPatch: (patch) ->
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165 @_applyPatch(patch)
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166 @_client.sendPatch(patch) if @_client
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167
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168 _applyPatch: (patch) ->
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169 # In most cases you want applyAndSendPatch.
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170 #
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171 # This is the only method that writes to @graph!
1317
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172 for quad in patch.delQuads
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173 @graph.removeTriple(quad)
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174 for quad in patch.addQuads
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175 @graph.addTriple(quad)
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176 #log('applied patch locally', patchSizeSummary(patch))
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177 @_watchers.graphChanged(patch)
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178 @_autoDeps.graphChanged(patch)
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179
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180 getObjectPatch: (s, p, newObject, g) ->
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181 # send a patch which removes existing values for (s,p,*,c) and
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182 # adds (s,p,newObject,c). Values in other graphs are not affected.
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183 existing = @graph.findByIRI(s, p, null, g)
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184 return {
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185 delQuads: existing,
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186 addQuads: [{subject: s, predicate: p, object: newObject, graph: g}]
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187 }
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188
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189 patchObject: (s, p, newObject, g) ->
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190 @applyAndSendPatch(@getObjectPatch(s, p, newObject, g))
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191
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192
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193 subscribe: (s, p, o, onChange) -> # return subscription handle
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194 # onChange is called with a patch that's limited to the quads
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diff changeset
195 # that match your request.
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196 # We call you immediately on existing triples.
1357
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197 handle = @_watchers.subscribe(s, p, o, onChange)
1317
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198 immediatePatch = {delQuads: [], addQuads: @graph.findByIRI(s, p, o)}
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199 if immediatePatch.addQuads.length
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200 onChange(immediatePatch)
1357
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diff changeset
201 return handle
1317
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diff changeset
202
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diff changeset
203 unsubscribe: (subscription) ->
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diff changeset
204 @_watchers.unsubscribe(subscription)
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205
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diff changeset
206 runHandler: (func) ->
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diff changeset
207 # runs your func once, tracking graph calls. if a future patch
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diff changeset
208 # matches what you queried, we runHandler your func again (and
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diff changeset
209 # forget your queries from the first time).
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diff changeset
210 @_autoDeps.runHandler(func)
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diff changeset
211
1356
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diff changeset
212 _singleValue: (s, p) ->
1363
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diff changeset
213 @_autoDeps.askedFor(s, p, null, null)
1317
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214 quads = @graph.findByIRI(s, p)
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diff changeset
215 switch quads.length
1356
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diff changeset
216 when 0
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diff changeset
217 throw new Error("no value for "+s+" "+p)
1317
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diff changeset
218 when 1
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diff changeset
219 obj = quads[0].object
1358
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diff changeset
220 return obj
1317
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diff changeset
221 else
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diff changeset
222 throw new Error("too many values: " + JSON.stringify(quads))
1356
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diff changeset
223
16aa26b7d685 timeline audio loads the current song img
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diff changeset
224 floatValue: (s, p) ->
1358
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diff changeset
225 parseFloat(N3.Util.getLiteralValue(@_singleValue(s, p)))
1317
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diff changeset
226
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diff changeset
227 stringValue: (s, p) ->
1358
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diff changeset
228 N3.Util.getLiteralValue(@_singleValue(s, p))
1356
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diff changeset
229
1317
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diff changeset
230 uriValue: (s, p) ->
1358
6ea2e1aa5070 uriValue support
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diff changeset
231 @_singleValue(s, p)
1317
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parents:
diff changeset
232
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diff changeset
233 objects: (s, p) ->
1363
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diff changeset
234 @_autoDeps.askedFor(s, p, null, null)
1358
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diff changeset
235 quads = @graph.findByIRI(s, p)
6ea2e1aa5070 uriValue support
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diff changeset
236 return (q.object for q in quads)
1317
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diff changeset
237
4c6d88aa9e26 enough element and rdf support to drag one adjuster and see its value change
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diff changeset
238 subjects: (p, o) ->
1363
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diff changeset
239 @_autoDeps.askedFor(null, p, o, null)
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diff changeset
240 quads = @graph.findByIRI(null, p, o)
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diff changeset
241 return (q.subject for q in quads)
1317
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diff changeset
242
4c6d88aa9e26 enough element and rdf support to drag one adjuster and see its value change
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diff changeset
243 items: (list) ->
1363
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diff changeset
244 out = []
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
245 current = list
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
246 while true
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
247 if current == RDF + 'nil'
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
248 break
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
249
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
250 firsts = @graph.findByIRI(current, RDF + 'first', null)
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diff changeset
251 rests = @graph.findByIRI(current, RDF + 'rest', null)
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
252 if firsts.length != 1
233b81d9bd9d simple first version of SyncedGraph.runHandler
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diff changeset
253 throw new Error("list node #{current} has #{firsts.length} rdf:first edges")
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
diff changeset
254 out.push(firsts[0].object)
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
diff changeset
255
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
diff changeset
256 if rests.length != 1
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
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257 throw new Error("list node #{current} has #{rests.length} rdf:rest edges")
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
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258 current = rests[0].object
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
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259
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
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260 return out
1317
4c6d88aa9e26 enough element and rdf support to drag one adjuster and see its value change
Drew Perttula <drewp@bigasterisk.com>
parents:
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261
4c6d88aa9e26 enough element and rdf support to drag one adjuster and see its value change
Drew Perttula <drewp@bigasterisk.com>
parents:
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262 contains: (s, p, o) ->
1363
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
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263 @_autoDeps.askedFor(s, p, o, null)
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
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264 return @graph.findByIRI(s, p, o).length > 0
1317
4c6d88aa9e26 enough element and rdf support to drag one adjuster and see its value change
Drew Perttula <drewp@bigasterisk.com>
parents:
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265
1363
233b81d9bd9d simple first version of SyncedGraph.runHandler
Drew Perttula <drewp@bigasterisk.com>
parents: 1362
diff changeset
266