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205 lines
7.5 KiB
Go
205 lines
7.5 KiB
Go
package uniseg
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import "unicode/utf8"
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// The states of the sentence break parser.
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const (
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sbAny = iota
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sbCR
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sbParaSep
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sbATerm
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sbUpper
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sbLower
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sbSB7
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sbSB8Close
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sbSB8Sp
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sbSTerm
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sbSB8aClose
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sbSB8aSp
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)
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// The sentence break parser's breaking instructions.
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const (
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sbDontBreak = iota
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sbBreak
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)
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// The sentence break parser's state transitions. It's anologous to
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// grTransitions, see comments there for details. Unicode version 14.0.0.
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var sbTransitions = map[[2]int][3]int{
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// SB3.
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{sbAny, prCR}: {sbCR, sbDontBreak, 9990},
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{sbCR, prLF}: {sbParaSep, sbDontBreak, 30},
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// SB4.
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{sbAny, prSep}: {sbParaSep, sbDontBreak, 9990},
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{sbAny, prLF}: {sbParaSep, sbDontBreak, 9990},
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{sbParaSep, prAny}: {sbAny, sbBreak, 40},
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{sbCR, prAny}: {sbAny, sbBreak, 40},
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// SB6.
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{sbAny, prATerm}: {sbATerm, sbDontBreak, 9990},
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{sbATerm, prNumeric}: {sbAny, sbDontBreak, 60},
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{sbSB7, prNumeric}: {sbAny, sbDontBreak, 60}, // Because ATerm also appears in SB7.
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// SB7.
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{sbAny, prUpper}: {sbUpper, sbDontBreak, 9990},
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{sbAny, prLower}: {sbLower, sbDontBreak, 9990},
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{sbUpper, prATerm}: {sbSB7, sbDontBreak, 70},
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{sbLower, prATerm}: {sbSB7, sbDontBreak, 70},
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{sbSB7, prUpper}: {sbUpper, sbDontBreak, 70},
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// SB8a.
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{sbAny, prSTerm}: {sbSTerm, sbDontBreak, 9990},
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{sbATerm, prSContinue}: {sbAny, sbDontBreak, 81},
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{sbATerm, prATerm}: {sbATerm, sbDontBreak, 81},
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{sbATerm, prSTerm}: {sbSTerm, sbDontBreak, 81},
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{sbSB7, prSContinue}: {sbAny, sbDontBreak, 81},
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{sbSB7, prATerm}: {sbATerm, sbDontBreak, 81},
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{sbSB7, prSTerm}: {sbSTerm, sbDontBreak, 81},
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{sbSB8Close, prSContinue}: {sbAny, sbDontBreak, 81},
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{sbSB8Close, prATerm}: {sbATerm, sbDontBreak, 81},
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{sbSB8Close, prSTerm}: {sbSTerm, sbDontBreak, 81},
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{sbSB8Sp, prSContinue}: {sbAny, sbDontBreak, 81},
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{sbSB8Sp, prATerm}: {sbATerm, sbDontBreak, 81},
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{sbSB8Sp, prSTerm}: {sbSTerm, sbDontBreak, 81},
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{sbSTerm, prSContinue}: {sbAny, sbDontBreak, 81},
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{sbSTerm, prATerm}: {sbATerm, sbDontBreak, 81},
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{sbSTerm, prSTerm}: {sbSTerm, sbDontBreak, 81},
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{sbSB8aClose, prSContinue}: {sbAny, sbDontBreak, 81},
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{sbSB8aClose, prATerm}: {sbATerm, sbDontBreak, 81},
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{sbSB8aClose, prSTerm}: {sbSTerm, sbDontBreak, 81},
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{sbSB8aSp, prSContinue}: {sbAny, sbDontBreak, 81},
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{sbSB8aSp, prATerm}: {sbATerm, sbDontBreak, 81},
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{sbSB8aSp, prSTerm}: {sbSTerm, sbDontBreak, 81},
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// SB9.
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{sbATerm, prClose}: {sbSB8Close, sbDontBreak, 90},
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{sbSB7, prClose}: {sbSB8Close, sbDontBreak, 90},
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{sbSB8Close, prClose}: {sbSB8Close, sbDontBreak, 90},
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{sbATerm, prSp}: {sbSB8Sp, sbDontBreak, 90},
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{sbSB7, prSp}: {sbSB8Sp, sbDontBreak, 90},
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{sbSB8Close, prSp}: {sbSB8Sp, sbDontBreak, 90},
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{sbSTerm, prClose}: {sbSB8aClose, sbDontBreak, 90},
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{sbSB8aClose, prClose}: {sbSB8aClose, sbDontBreak, 90},
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{sbSTerm, prSp}: {sbSB8aSp, sbDontBreak, 90},
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{sbSB8aClose, prSp}: {sbSB8aSp, sbDontBreak, 90},
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{sbATerm, prSep}: {sbParaSep, sbDontBreak, 90},
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{sbATerm, prCR}: {sbParaSep, sbDontBreak, 90},
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{sbATerm, prLF}: {sbParaSep, sbDontBreak, 90},
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{sbSB7, prSep}: {sbParaSep, sbDontBreak, 90},
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{sbSB7, prCR}: {sbParaSep, sbDontBreak, 90},
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{sbSB7, prLF}: {sbParaSep, sbDontBreak, 90},
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{sbSB8Close, prSep}: {sbParaSep, sbDontBreak, 90},
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{sbSB8Close, prCR}: {sbParaSep, sbDontBreak, 90},
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{sbSB8Close, prLF}: {sbParaSep, sbDontBreak, 90},
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{sbSTerm, prSep}: {sbParaSep, sbDontBreak, 90},
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{sbSTerm, prCR}: {sbParaSep, sbDontBreak, 90},
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{sbSTerm, prLF}: {sbParaSep, sbDontBreak, 90},
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{sbSB8aClose, prSep}: {sbParaSep, sbDontBreak, 90},
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{sbSB8aClose, prCR}: {sbParaSep, sbDontBreak, 90},
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{sbSB8aClose, prLF}: {sbParaSep, sbDontBreak, 90},
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// SB10.
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{sbSB8Sp, prSp}: {sbSB8Sp, sbDontBreak, 100},
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{sbSB8aSp, prSp}: {sbSB8aSp, sbDontBreak, 100},
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{sbSB8Sp, prSep}: {sbParaSep, sbDontBreak, 100},
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{sbSB8Sp, prCR}: {sbParaSep, sbDontBreak, 100},
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{sbSB8Sp, prLF}: {sbParaSep, sbDontBreak, 100},
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// SB11.
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{sbATerm, prAny}: {sbAny, sbBreak, 110},
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{sbSB7, prAny}: {sbAny, sbBreak, 110},
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{sbSB8Close, prAny}: {sbAny, sbBreak, 110},
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{sbSB8Sp, prAny}: {sbAny, sbBreak, 110},
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{sbSTerm, prAny}: {sbAny, sbBreak, 110},
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{sbSB8aClose, prAny}: {sbAny, sbBreak, 110},
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{sbSB8aSp, prAny}: {sbAny, sbBreak, 110},
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// We'll always break after ParaSep due to SB4.
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}
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// transitionSentenceBreakState determines the new state of the sentence break
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// parser given the current state and the next code point. It also returns
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// whether a sentence boundary was detected. If more than one code point is
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// needed to determine the new state, the byte slice or the string starting
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// after rune "r" can be used (whichever is not nil or empty) for further
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// lookups.
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func transitionSentenceBreakState(state int, r rune, b []byte, str string) (newState int, sentenceBreak bool) {
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// Determine the property of the next character.
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nextProperty := property(sentenceBreakCodePoints, r)
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// SB5 (Replacing Ignore Rules).
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if nextProperty == prExtend || nextProperty == prFormat {
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if state == sbParaSep || state == sbCR {
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return sbAny, true // Make sure we don't apply SB5 to SB3 or SB4.
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}
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if state < 0 {
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return sbAny, true // SB1.
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}
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return state, false
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}
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// Find the applicable transition in the table.
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var rule int
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transition, ok := sbTransitions[[2]int{state, nextProperty}]
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if ok {
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// We have a specific transition. We'll use it.
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newState, sentenceBreak, rule = transition[0], transition[1] == sbBreak, transition[2]
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} else {
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// No specific transition found. Try the less specific ones.
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transAnyProp, okAnyProp := sbTransitions[[2]int{state, prAny}]
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transAnyState, okAnyState := sbTransitions[[2]int{sbAny, nextProperty}]
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if okAnyProp && okAnyState {
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// Both apply. We'll use a mix (see comments for grTransitions).
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newState, sentenceBreak, rule = transAnyState[0], transAnyState[1] == sbBreak, transAnyState[2]
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if transAnyProp[2] < transAnyState[2] {
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sentenceBreak, rule = transAnyProp[1] == sbBreak, transAnyProp[2]
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}
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} else if okAnyProp {
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// We only have a specific state.
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newState, sentenceBreak, rule = transAnyProp[0], transAnyProp[1] == sbBreak, transAnyProp[2]
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// This branch will probably never be reached because okAnyState will
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// always be true given the current transition map. But we keep it here
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// for future modifications to the transition map where this may not be
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// true anymore.
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} else if okAnyState {
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// We only have a specific property.
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newState, sentenceBreak, rule = transAnyState[0], transAnyState[1] == sbBreak, transAnyState[2]
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} else {
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// No known transition. SB999: Any × Any.
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newState, sentenceBreak, rule = sbAny, false, 9990
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}
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}
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// SB8.
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if rule > 80 && (state == sbATerm || state == sbSB8Close || state == sbSB8Sp || state == sbSB7) {
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// Check the right side of the rule.
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var length int
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for nextProperty != prOLetter &&
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nextProperty != prUpper &&
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nextProperty != prLower &&
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nextProperty != prSep &&
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nextProperty != prCR &&
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nextProperty != prLF &&
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nextProperty != prATerm &&
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nextProperty != prSTerm {
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// Move on to the next rune.
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if b != nil { // Byte slice version.
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r, length = utf8.DecodeRune(b)
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b = b[length:]
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} else { // String version.
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r, length = utf8.DecodeRuneInString(str)
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str = str[length:]
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}
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if r == utf8.RuneError {
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break
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}
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nextProperty = property(sentenceBreakCodePoints, r)
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}
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if nextProperty == prLower {
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return sbLower, false
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}
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}
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return
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}
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