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471 lines
14 KiB
Go
471 lines
14 KiB
Go
package uniseg
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import "unicode/utf8"
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// The states of the line break parser.
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const (
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lbAny = iota
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lbBK
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lbCR
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lbLF
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lbNL
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lbSP
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lbZW
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lbWJ
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lbGL
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lbBA
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lbHY
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lbCL
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lbCP
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lbEX
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lbIS
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lbSY
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lbOP
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lbQU
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lbQUSP
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lbNS
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lbCLCPSP
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lbB2
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lbB2SP
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lbCB
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lbBB
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lbLB21a
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lbHL
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lbAL
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lbNU
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lbPR
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lbEB
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lbIDEM
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lbNUNU
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lbNUSY
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lbNUIS
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lbNUCL
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lbNUCP
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lbPO
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lbJL
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lbJV
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lbJT
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lbH2
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lbH3
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lbOddRI
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lbEvenRI
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lbExtPicCn
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lbZWJBit = 64
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lbCPeaFWHBit = 128
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)
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// These constants define whether a given text may be broken into the next line.
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// If the break is optional (LineCanBreak), you may choose to break or not based
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// on your own criteria, for example, if the text has reached the available
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// width.
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const (
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LineDontBreak = iota // You may not break the line here.
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LineCanBreak // You may or may not break the line here.
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LineMustBreak // You must break the line here.
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)
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// The line break parser's state transitions. It's anologous to grTransitions,
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// see comments there for details. Unicode version 14.0.0.
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var lbTransitions = map[[2]int][3]int{
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// LB4.
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{lbAny, prBK}: {lbBK, LineCanBreak, 310},
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{lbBK, prAny}: {lbAny, LineMustBreak, 40},
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// LB5.
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{lbAny, prCR}: {lbCR, LineCanBreak, 310},
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{lbAny, prLF}: {lbLF, LineCanBreak, 310},
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{lbAny, prNL}: {lbNL, LineCanBreak, 310},
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{lbCR, prLF}: {lbLF, LineDontBreak, 50},
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{lbCR, prAny}: {lbAny, LineMustBreak, 50},
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{lbLF, prAny}: {lbAny, LineMustBreak, 50},
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{lbNL, prAny}: {lbAny, LineMustBreak, 50},
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// LB6.
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{lbAny, prBK}: {lbBK, LineDontBreak, 60},
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{lbAny, prCR}: {lbCR, LineDontBreak, 60},
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{lbAny, prLF}: {lbLF, LineDontBreak, 60},
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{lbAny, prNL}: {lbNL, LineDontBreak, 60},
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// LB7.
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{lbAny, prSP}: {lbSP, LineDontBreak, 70},
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{lbAny, prZW}: {lbZW, LineDontBreak, 70},
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// LB8.
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{lbZW, prSP}: {lbZW, LineDontBreak, 70},
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{lbZW, prAny}: {lbAny, LineCanBreak, 80},
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// LB11.
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{lbAny, prWJ}: {lbWJ, LineDontBreak, 110},
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{lbWJ, prAny}: {lbAny, LineDontBreak, 110},
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// LB12.
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{lbAny, prGL}: {lbGL, LineCanBreak, 310},
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{lbGL, prAny}: {lbAny, LineDontBreak, 120},
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// LB13 (simple transitions).
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{lbAny, prCL}: {lbCL, LineCanBreak, 310},
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{lbAny, prCP}: {lbCP, LineCanBreak, 310},
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{lbAny, prEX}: {lbEX, LineDontBreak, 130},
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{lbAny, prIS}: {lbIS, LineCanBreak, 310},
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{lbAny, prSY}: {lbSY, LineCanBreak, 310},
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// LB14.
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{lbAny, prOP}: {lbOP, LineCanBreak, 310},
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{lbOP, prSP}: {lbOP, LineDontBreak, 70},
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{lbOP, prAny}: {lbAny, LineDontBreak, 140},
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// LB15.
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{lbQU, prSP}: {lbQUSP, LineDontBreak, 70},
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{lbQU, prOP}: {lbOP, LineDontBreak, 150},
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{lbQUSP, prOP}: {lbOP, LineDontBreak, 150},
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// LB16.
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{lbCL, prSP}: {lbCLCPSP, LineDontBreak, 70},
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{lbNUCL, prSP}: {lbCLCPSP, LineDontBreak, 70},
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{lbCP, prSP}: {lbCLCPSP, LineDontBreak, 70},
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{lbNUCP, prSP}: {lbCLCPSP, LineDontBreak, 70},
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{lbCL, prNS}: {lbNS, LineDontBreak, 160},
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{lbNUCL, prNS}: {lbNS, LineDontBreak, 160},
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{lbCP, prNS}: {lbNS, LineDontBreak, 160},
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{lbNUCP, prNS}: {lbNS, LineDontBreak, 160},
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{lbCLCPSP, prNS}: {lbNS, LineDontBreak, 160},
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// LB17.
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{lbAny, prB2}: {lbB2, LineCanBreak, 310},
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{lbB2, prSP}: {lbB2SP, LineDontBreak, 70},
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{lbB2, prB2}: {lbB2, LineDontBreak, 170},
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{lbB2SP, prB2}: {lbB2, LineDontBreak, 170},
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// LB18.
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{lbSP, prAny}: {lbAny, LineCanBreak, 180},
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{lbQUSP, prAny}: {lbAny, LineCanBreak, 180},
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{lbCLCPSP, prAny}: {lbAny, LineCanBreak, 180},
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{lbB2SP, prAny}: {lbAny, LineCanBreak, 180},
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// LB19.
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{lbAny, prQU}: {lbQU, LineDontBreak, 190},
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{lbQU, prAny}: {lbAny, LineDontBreak, 190},
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// LB20.
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{lbAny, prCB}: {lbCB, LineCanBreak, 200},
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{lbCB, prAny}: {lbAny, LineCanBreak, 200},
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// LB21.
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{lbAny, prBA}: {lbBA, LineDontBreak, 210},
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{lbAny, prHY}: {lbHY, LineDontBreak, 210},
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{lbAny, prNS}: {lbNS, LineDontBreak, 210},
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{lbAny, prBB}: {lbBB, LineCanBreak, 310},
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{lbBB, prAny}: {lbAny, LineDontBreak, 210},
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// LB21a.
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{lbAny, prHL}: {lbHL, LineCanBreak, 310},
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{lbHL, prHY}: {lbLB21a, LineDontBreak, 210},
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{lbHL, prBA}: {lbLB21a, LineDontBreak, 210},
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{lbLB21a, prAny}: {lbAny, LineDontBreak, 211},
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// LB21b.
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{lbSY, prHL}: {lbHL, LineDontBreak, 212},
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{lbNUSY, prHL}: {lbHL, LineDontBreak, 212},
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// LB22.
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{lbAny, prIN}: {lbAny, LineDontBreak, 220},
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// LB23.
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{lbAny, prAL}: {lbAL, LineCanBreak, 310},
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{lbAny, prNU}: {lbNU, LineCanBreak, 310},
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{lbAL, prNU}: {lbNU, LineDontBreak, 230},
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{lbHL, prNU}: {lbNU, LineDontBreak, 230},
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{lbNU, prAL}: {lbAL, LineDontBreak, 230},
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{lbNU, prHL}: {lbHL, LineDontBreak, 230},
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{lbNUNU, prAL}: {lbAL, LineDontBreak, 230},
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{lbNUNU, prHL}: {lbHL, LineDontBreak, 230},
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// LB23a.
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{lbAny, prPR}: {lbPR, LineCanBreak, 310},
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{lbAny, prID}: {lbIDEM, LineCanBreak, 310},
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{lbAny, prEB}: {lbEB, LineCanBreak, 310},
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{lbAny, prEM}: {lbIDEM, LineCanBreak, 310},
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{lbPR, prID}: {lbIDEM, LineDontBreak, 231},
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{lbPR, prEB}: {lbEB, LineDontBreak, 231},
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{lbPR, prEM}: {lbIDEM, LineDontBreak, 231},
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{lbIDEM, prPO}: {lbPO, LineDontBreak, 231},
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{lbEB, prPO}: {lbPO, LineDontBreak, 231},
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// LB24.
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{lbAny, prPO}: {lbPO, LineCanBreak, 310},
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{lbPR, prAL}: {lbAL, LineDontBreak, 240},
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{lbPR, prHL}: {lbHL, LineDontBreak, 240},
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{lbPO, prAL}: {lbAL, LineDontBreak, 240},
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{lbPO, prHL}: {lbHL, LineDontBreak, 240},
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{lbAL, prPR}: {lbPR, LineDontBreak, 240},
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{lbAL, prPO}: {lbPO, LineDontBreak, 240},
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{lbHL, prPR}: {lbPR, LineDontBreak, 240},
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{lbHL, prPO}: {lbPO, LineDontBreak, 240},
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// LB25 (simple transitions).
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{lbPR, prNU}: {lbNU, LineDontBreak, 250},
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{lbPO, prNU}: {lbNU, LineDontBreak, 250},
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{lbOP, prNU}: {lbNU, LineDontBreak, 250},
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{lbHY, prNU}: {lbNU, LineDontBreak, 250},
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{lbNU, prNU}: {lbNUNU, LineDontBreak, 250},
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{lbNU, prSY}: {lbNUSY, LineDontBreak, 250},
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{lbNU, prIS}: {lbNUIS, LineDontBreak, 250},
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{lbNUNU, prNU}: {lbNUNU, LineDontBreak, 250},
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{lbNUNU, prSY}: {lbNUSY, LineDontBreak, 250},
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{lbNUNU, prIS}: {lbNUIS, LineDontBreak, 250},
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{lbNUSY, prNU}: {lbNUNU, LineDontBreak, 250},
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{lbNUSY, prSY}: {lbNUSY, LineDontBreak, 250},
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{lbNUSY, prIS}: {lbNUIS, LineDontBreak, 250},
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{lbNUIS, prNU}: {lbNUNU, LineDontBreak, 250},
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{lbNUIS, prSY}: {lbNUSY, LineDontBreak, 250},
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{lbNUIS, prIS}: {lbNUIS, LineDontBreak, 250},
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{lbNU, prCL}: {lbNUCL, LineDontBreak, 250},
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{lbNU, prCP}: {lbNUCP, LineDontBreak, 250},
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{lbNUNU, prCL}: {lbNUCL, LineDontBreak, 250},
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{lbNUNU, prCP}: {lbNUCP, LineDontBreak, 250},
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{lbNUSY, prCL}: {lbNUCL, LineDontBreak, 250},
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{lbNUSY, prCP}: {lbNUCP, LineDontBreak, 250},
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{lbNUIS, prCL}: {lbNUCL, LineDontBreak, 250},
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{lbNUIS, prCP}: {lbNUCP, LineDontBreak, 250},
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{lbNU, prPO}: {lbPO, LineDontBreak, 250},
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{lbNUNU, prPO}: {lbPO, LineDontBreak, 250},
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{lbNUSY, prPO}: {lbPO, LineDontBreak, 250},
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{lbNUIS, prPO}: {lbPO, LineDontBreak, 250},
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{lbNUCL, prPO}: {lbPO, LineDontBreak, 250},
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{lbNUCP, prPO}: {lbPO, LineDontBreak, 250},
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{lbNU, prPR}: {lbPR, LineDontBreak, 250},
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{lbNUNU, prPR}: {lbPR, LineDontBreak, 250},
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{lbNUSY, prPR}: {lbPR, LineDontBreak, 250},
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{lbNUIS, prPR}: {lbPR, LineDontBreak, 250},
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{lbNUCL, prPR}: {lbPR, LineDontBreak, 250},
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{lbNUCP, prPR}: {lbPR, LineDontBreak, 250},
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// LB26.
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{lbAny, prJL}: {lbJL, LineCanBreak, 310},
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{lbAny, prJV}: {lbJV, LineCanBreak, 310},
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{lbAny, prJT}: {lbJT, LineCanBreak, 310},
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{lbAny, prH2}: {lbH2, LineCanBreak, 310},
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{lbAny, prH3}: {lbH3, LineCanBreak, 310},
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{lbJL, prJL}: {lbJL, LineDontBreak, 260},
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{lbJL, prJV}: {lbJV, LineDontBreak, 260},
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{lbJL, prH2}: {lbH2, LineDontBreak, 260},
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{lbJL, prH3}: {lbH3, LineDontBreak, 260},
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{lbJV, prJV}: {lbJV, LineDontBreak, 260},
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{lbJV, prJT}: {lbJT, LineDontBreak, 260},
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{lbH2, prJV}: {lbJV, LineDontBreak, 260},
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{lbH2, prJT}: {lbJT, LineDontBreak, 260},
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{lbJT, prJT}: {lbJT, LineDontBreak, 260},
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{lbH3, prJT}: {lbJT, LineDontBreak, 260},
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// LB27.
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{lbJL, prPO}: {lbPO, LineDontBreak, 270},
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{lbJV, prPO}: {lbPO, LineDontBreak, 270},
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{lbJT, prPO}: {lbPO, LineDontBreak, 270},
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{lbH2, prPO}: {lbPO, LineDontBreak, 270},
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{lbH3, prPO}: {lbPO, LineDontBreak, 270},
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{lbPR, prJL}: {lbJL, LineDontBreak, 270},
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{lbPR, prJV}: {lbJV, LineDontBreak, 270},
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{lbPR, prJT}: {lbJT, LineDontBreak, 270},
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{lbPR, prH2}: {lbH2, LineDontBreak, 270},
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{lbPR, prH3}: {lbH3, LineDontBreak, 270},
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// LB28.
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{lbAL, prAL}: {lbAL, LineDontBreak, 280},
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{lbAL, prHL}: {lbHL, LineDontBreak, 280},
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{lbHL, prAL}: {lbAL, LineDontBreak, 280},
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{lbHL, prHL}: {lbHL, LineDontBreak, 280},
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// LB29.
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{lbIS, prAL}: {lbAL, LineDontBreak, 290},
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{lbIS, prHL}: {lbHL, LineDontBreak, 290},
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{lbNUIS, prAL}: {lbAL, LineDontBreak, 290},
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{lbNUIS, prHL}: {lbHL, LineDontBreak, 290},
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}
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// transitionLineBreakState determines the new state of the line break parser
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// given the current state and the next code point. It also returns the type of
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// line break: LineDontBreak, LineCanBreak, or LineMustBreak. If more than one
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// code point is needed to determine the new state, the byte slice or the string
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// starting after rune "r" can be used (whichever is not nil or empty) for
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// further lookups.
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func transitionLineBreakState(state int, r rune, b []byte, str string) (newState int, lineBreak int) {
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// Determine the property of the next character.
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nextProperty, generalCategory := propertyWithGenCat(lineBreakCodePoints, r)
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// Prepare.
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var forceNoBreak, isCPeaFWH bool
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if state >= 0 && state&lbCPeaFWHBit != 0 {
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isCPeaFWH = true // LB30: CP but ea is not F, W, or H.
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state = state &^ lbCPeaFWHBit
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}
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if state >= 0 && state&lbZWJBit != 0 {
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state = state &^ lbZWJBit // Extract zero-width joiner bit.
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forceNoBreak = true // LB8a.
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}
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defer func() {
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// Transition into LB30.
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if newState == lbCP || newState == lbNUCP {
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ea := property(eastAsianWidth, r)
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if ea != prF && ea != prW && ea != prH {
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newState |= lbCPeaFWHBit
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}
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}
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// Override break.
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if forceNoBreak {
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lineBreak = LineDontBreak
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}
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}()
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// LB1.
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if nextProperty == prAI || nextProperty == prSG || nextProperty == prXX {
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nextProperty = prAL
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} else if nextProperty == prSA {
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if generalCategory == gcMn || generalCategory == gcMc {
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nextProperty = prCM
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} else {
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nextProperty = prAL
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}
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} else if nextProperty == prCJ {
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nextProperty = prNS
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}
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// Combining marks.
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if nextProperty == prZWJ || nextProperty == prCM {
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var bit int
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if nextProperty == prZWJ {
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bit = lbZWJBit
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}
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mustBreakState := state < 0 || state == lbBK || state == lbCR || state == lbLF || state == lbNL
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if !mustBreakState && state != lbSP && state != lbZW && state != lbQUSP && state != lbCLCPSP && state != lbB2SP {
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// LB9.
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return state | bit, LineDontBreak
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} else {
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// LB10.
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if mustBreakState {
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return lbAL | bit, LineMustBreak
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}
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return lbAL | bit, LineCanBreak
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}
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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 := lbTransitions[[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, lineBreak, rule = transition[0], transition[1], 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 := lbTransitions[[2]int{state, prAny}]
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transAnyState, okAnyState := lbTransitions[[2]int{lbAny, 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, lineBreak, rule = transAnyState[0], transAnyState[1], transAnyState[2]
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if transAnyProp[2] < transAnyState[2] {
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lineBreak, rule = transAnyProp[1], 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, lineBreak, rule = transAnyProp[0], transAnyProp[1], 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, lineBreak, rule = transAnyState[0], transAnyState[1], transAnyState[2]
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} else {
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// No known transition. LB31: ALL ÷ ALL.
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newState, lineBreak, rule = lbAny, LineCanBreak, 310
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}
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}
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// LB12a.
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if rule > 121 &&
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nextProperty == prGL &&
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(state != lbSP && state != lbBA && state != lbHY && state != lbLB21a && state != lbQUSP && state != lbCLCPSP && state != lbB2SP) {
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return lbGL, LineDontBreak
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}
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// LB13.
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if rule > 130 && state != lbNU && state != lbNUNU {
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switch nextProperty {
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case prCL:
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return lbCL, LineDontBreak
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case prCP:
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return lbCP, LineDontBreak
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case prIS:
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return lbIS, LineDontBreak
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case prSY:
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return lbSY, LineDontBreak
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}
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}
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// LB25 (look ahead).
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if rule > 250 &&
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(state == lbPR || state == lbPO) &&
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nextProperty == prOP || nextProperty == prHY {
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var r rune
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if b != nil { // Byte slice version.
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r, _ = utf8.DecodeRune(b)
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} else { // String version.
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r, _ = utf8.DecodeRuneInString(str)
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}
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if r != utf8.RuneError {
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pr, _ := propertyWithGenCat(lineBreakCodePoints, r)
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if pr == prNU {
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return lbNU, LineDontBreak
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}
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}
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}
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// LB30 (part one).
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if rule > 300 {
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if (state == lbAL || state == lbHL || state == lbNU || state == lbNUNU) && nextProperty == prOP {
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ea := property(eastAsianWidth, r)
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if ea != prF && ea != prW && ea != prH {
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return lbOP, LineDontBreak
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}
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} else if isCPeaFWH {
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switch nextProperty {
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|
case prAL:
|
|
return lbAL, LineDontBreak
|
|
case prHL:
|
|
return lbHL, LineDontBreak
|
|
case prNU:
|
|
return lbNU, LineDontBreak
|
|
}
|
|
}
|
|
}
|
|
|
|
// LB30a.
|
|
if newState == lbAny && nextProperty == prRI {
|
|
if state != lbOddRI && state != lbEvenRI { // Includes state == -1.
|
|
// Transition into the first RI.
|
|
return lbOddRI, lineBreak
|
|
}
|
|
if state == lbOddRI {
|
|
// Don't break pairs of Regional Indicators.
|
|
return lbEvenRI, LineDontBreak
|
|
}
|
|
return lbOddRI, lineBreak
|
|
}
|
|
|
|
// LB30b.
|
|
if rule > 302 {
|
|
if nextProperty == prEM {
|
|
if state == lbEB || state == lbExtPicCn {
|
|
return prAny, LineDontBreak
|
|
}
|
|
}
|
|
graphemeProperty := property(graphemeCodePoints, r)
|
|
if graphemeProperty == prExtendedPictographic && generalCategory == gcCn {
|
|
return lbExtPicCn, LineCanBreak
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|