Upstream spencermountain/compromise state of the touched files before 53d5f9abeb

src/3-three/sentences/parse/mainClause.js

@@ -0,0 +1,50 @@
+// if a clause starts with these, it's not a main clause
+const subordinate = `(after|although|as|because|before|if|since|than|that|though|when|whenever|where|whereas|wherever|whether|while|why|unless|until|once)`
+const relative = `(that|which|whichever|who|whoever|whom|whose|whomever)`
+
+//try to remove secondary clauses
+const mainClause = function (s) {
+  let m = s
+  if (m.length === 1) {
+    return m
+  }
+  // if there's no verb, it's dependent
+  m = m.if('#Verb')
+  if (m.length === 1) {
+    return m
+  }
+  // this is a signal for subordinate-clauses
+  m = m.ifNo(subordinate)
+  m = m.ifNo('^even (if|though)')
+  m = m.ifNo('^so that')
+  m = m.ifNo('^rather than')
+  m = m.ifNo('^provided that')
+  if (m.length === 1) {
+    return m
+  }
+  // relative clauses
+  m = m.ifNo(relative)
+  if (m.length === 1) {
+    return m
+  }
+
+  // check for subordinating conjunctions -- must be at the beginning of the clause
+  m = m.ifNo('(^despite|^during|^before|^through|^throughout)')
+  if (m.length === 1) {
+    return m
+  }
+
+  // check for clauses beginning with Gerund ("Taking ..., ...")
+  m = m.ifNo('^#Gerund')
+  if (m.length === 1) {
+    return m
+  }
+
+  // did we go too far?
+  if (m.length === 0) {
+    m = s
+  }
+  // choose the first one?
+  return m.eq(0)
+}
+export default mainClause