51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
// if a clause starts with these, it's not a main clause
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const subordinate = `(after|although|as|because|before|if|since|than|that|though|when|whenever|where|whereas|wherever|whether|while|why|unless|until|once)`
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const relative = `(that|which|whichever|who|whoever|whom|whose|whomever)`
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//try to remove secondary clauses
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const mainClause = function (s) {
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let m = s
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if (m.length === 1) {
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return m
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}
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// if there's no verb, it's dependent
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m = m.if('#Verb')
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if (m.length === 1) {
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return m
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}
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// this is a signal for subordinate-clauses
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m = m.ifNo(subordinate)
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m = m.ifNo('^even (if|though)')
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m = m.ifNo('^so that')
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m = m.ifNo('^rather than')
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m = m.ifNo('^provided that')
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if (m.length === 1) {
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return m
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}
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// relative clauses
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m = m.ifNo(relative)
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if (m.length === 1) {
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return m
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}
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// check for subordinating conjunctions -- must be at the beginning of the clause
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m = m.ifNo('(^despite|^during|^before|^through|^throughout)')
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if (m.length === 1) {
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return m
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}
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// check for clauses beginning with Gerund ("Taking ..., ...")
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m = m.ifNo('^#Gerund')
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if (m.length === 1) {
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return m
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}
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// did we go too far?
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if (m.length === 0) {
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m = s
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}
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// choose the first one?
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return m.eq(0)
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}
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export default mainClause
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