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Original file line number | Diff line number | Diff line change |
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@@ -1,40 +1,57 @@ | ||
const {dom, rule, ruleset} = require('fathom-web'); | ||
const DEFAULT_RULESET = require('./lib/default-ruleset'); | ||
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const MetadataParser = { | ||
metadataRules: Object.assign({}, DEFAULT_RULESET), | ||
buildRuleset(name, rules) { | ||
const reversedRules = Array.from(rules).reverse(); | ||
const builtRuleset = ruleset(...reversedRules.map(([query, handler], order) => rule( | ||
dom(query), | ||
node => [{ | ||
score: order, | ||
flavor: name, | ||
notes: handler(node), | ||
}] | ||
))); | ||
function buildRuleset(name, rules) { | ||
const reversedRules = Array.from(rules).reverse(); | ||
const builtRuleset = ruleset(...reversedRules.map(([query, handler], order) => rule( | ||
dom(query), | ||
node => [{ | ||
score: order, | ||
flavor: name, | ||
notes: handler(node), | ||
}] | ||
))); | ||
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return doc => { | ||
const kb = builtRuleset.score(doc); | ||
const maxNode = kb.max(name); | ||
if (maxNode) { | ||
const value = maxNode.flavors.get(name); | ||
if (value) { | ||
return value.trim(); | ||
} | ||
return doc => { | ||
const kb = builtRuleset.score(doc); | ||
const maxNode = kb.max(name); | ||
if (maxNode) { | ||
const value = maxNode.flavors.get(name); | ||
if (value) { | ||
return value.trim(); | ||
} | ||
}; | ||
}, | ||
getMetadata(doc) { | ||
const metadata = {}; | ||
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Object.keys(MetadataParser.metadataRules).forEach(metadataKey => { | ||
const metadataRule = MetadataParser.buildRuleset(metadataKey, MetadataParser.metadataRules[metadataKey]); | ||
metadata[metadataKey] = metadataRule(doc); | ||
}); | ||
} | ||
}; | ||
} | ||
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function getMetadata(doc, rules) { | ||
return Object.keys(rules).reduce((metadata, key) => { | ||
metadata[key] = buildRuleset(key, rules[key])(doc); | ||
return metadata; | ||
}, {}); | ||
} | ||
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class MetadataParser { | ||
constructor(customRules = {}, options = {}) { | ||
this._rules = options.replace ? customRules : Object.assign({}, MetadataParser.metadataRules, customRules); | ||
} | ||
get rules() { | ||
return this._rules; | ||
} | ||
extend(key, rules, prepend) { | ||
if (!this._rules[key]) this._rules[key] = []; | ||
if (prepend) { | ||
this._rules[key] = rules.concat(this._rules[key]); | ||
} else { | ||
this._rules[key] = this._rules[key].concat(rules); | ||
} | ||
} | ||
getMetadata(doc) { | ||
return getMetadata(doc, this._rules); | ||
} | ||
}; | ||
} | ||
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MetadataParser.metadataRules = Object.assign({}, DEFAULT_RULESET); | ||
MetadataParser.buildRuleset = buildRuleset; | ||
MetadataParser.getMetadata = doc => getMetadata(doc, MetadataParser.metadataRules); | ||
module.exports = MetadataParser; |