mirror of
https://github.com/golang/go
synced 2024-11-21 22:44:40 -07:00
strconv: remove dependence on unicode and strings
We need a compact, reasonably efficient IsPrint. That adds about 2K of data, plus a modest amount of code, but now strconv is a near-leaf package. R=r, bradfitz, adg, rsc, minux.ma CC=golang-dev https://golang.org/cl/5756050
This commit is contained in:
Rob Pike
parent
7db4384354
commit
f91326b7b1
@ -52,7 +52,7 @@ var pkgDeps = map[string][]string{
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"math/rand": {"L0", "math"},
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"path": {"L0", "unicode/utf8", "strings"},
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"sort": {"math"},
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"strconv": {"L0", "unicode", "unicode/utf8", "math", "strings"},
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"strconv": {"L0", "unicode/utf8", "math"},
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"strings": {"L0", "unicode", "unicode/utf8"},
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"unicode": {},
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"unicode/utf16": {},
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@ -3,7 +3,7 @@
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package strconv
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// (474+134)*2 + (180+42)*4 = 2104 bytes
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// (474+134+42)*2 + (180)*4 = 2020 bytes
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var isPrint16 = []uint16{
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0x0020, 0x007e,
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@ -383,139 +383,139 @@ var isNotPrint16 = []uint16{
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}
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var isPrint32 = []uint32{
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0x000020, 0x00007e,
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0x0000a1, 0x000377,
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0x00037a, 0x00037e,
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0x000384, 0x000527,
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0x000531, 0x000556,
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0x000559, 0x00058a,
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0x000591, 0x0005c7,
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0x0005d0, 0x0005ea,
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0x0005f0, 0x0005f4,
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0x000606, 0x00061b,
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0x00061e, 0x00070d,
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0x000710, 0x00074a,
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0x00074d, 0x0007b1,
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0x0007c0, 0x0007fa,
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0x000800, 0x00082d,
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0x000830, 0x00085b,
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0x00085e, 0x00085e,
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0x000900, 0x00098c,
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0x00098f, 0x000990,
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0x000993, 0x0009b2,
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0x0009b6, 0x0009b9,
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0x0009bc, 0x0009c4,
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0x0009c7, 0x0009c8,
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0x0009cb, 0x0009ce,
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0x0009d7, 0x0009d7,
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0x0009dc, 0x0009e3,
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0x0009e6, 0x0009fb,
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0x000a01, 0x000a0a,
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0x000a0f, 0x000a10,
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0x000a13, 0x000a39,
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0x000a3c, 0x000a42,
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0x000a47, 0x000a48,
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0x000a4b, 0x000a4d,
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0x000a51, 0x000a51,
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0x000a59, 0x000a5e,
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0x000a66, 0x000a75,
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0x000a81, 0x000ab9,
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0x000abc, 0x000acd,
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0x000ad0, 0x000ad0,
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0x000ae0, 0x000ae3,
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0x000ae6, 0x000af1,
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0x000b01, 0x000b0c,
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0x000b0f, 0x000b10,
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0x000b13, 0x000b39,
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0x000b3c, 0x000b44,
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0x000b47, 0x000b48,
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0x000b4b, 0x000b4d,
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0x000b56, 0x000b57,
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0x000b5c, 0x000b63,
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0x000b66, 0x000b77,
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0x000b82, 0x000b8a,
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0x000b8e, 0x000b95,
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0x000b99, 0x000b9f,
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0x000ba3, 0x000ba4,
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0x000ba8, 0x000baa,
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0x000bae, 0x000bb9,
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0x000bbe, 0x000bc2,
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0x000bc6, 0x000bcd,
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0x000bd0, 0x000bd0,
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0x000bd7, 0x000bd7,
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0x000be6, 0x000bfa,
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0x000c01, 0x000c39,
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0x000c3d, 0x000c4d,
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0x000c55, 0x000c59,
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0x000c60, 0x000c63,
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0x000c66, 0x000c6f,
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0x000c78, 0x000c7f,
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0x000c82, 0x000cb9,
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0x000cbc, 0x000ccd,
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0x000cd5, 0x000cd6,
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0x000cde, 0x000ce3,
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0x000ce6, 0x000cf2,
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0x000d02, 0x000d3a,
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0x000d3d, 0x000d4e,
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0x000d57, 0x000d57,
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0x000d60, 0x000d63,
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0x000d66, 0x000d75,
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0x000d79, 0x000d7f,
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0x000d82, 0x000d96,
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0x000d9a, 0x000dbd,
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0x000dc0, 0x000dc6,
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0x000dca, 0x000dca,
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0x000dcf, 0x000ddf,
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0x000df2, 0x000df4,
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0x000e01, 0x000e3a,
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0x000e3f, 0x000e5b,
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0x000e81, 0x000e84,
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0x000e87, 0x000e8a,
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0x000e8d, 0x000e8d,
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0x000e94, 0x000ea7,
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0x010000, 0x01004d,
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0x010050, 0x01005d,
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0x010080, 0x0100fa,
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0x010100, 0x010102,
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0x010107, 0x010133,
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0x010137, 0x01018a,
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0x010190, 0x01019b,
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0x0101d0, 0x0101fd,
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0x010280, 0x01029c,
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0x0102a0, 0x0102d0,
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0x010300, 0x010323,
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0x010330, 0x01034a,
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0x010380, 0x0103c3,
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0x0103c8, 0x0103d5,
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0x010400, 0x01049d,
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0x0104a0, 0x0104a9,
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0x010800, 0x010805,
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0x010808, 0x010838,
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0x01083c, 0x01083c,
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0x01083f, 0x01085f,
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0x010900, 0x01091b,
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0x01091f, 0x010939,
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0x01093f, 0x01093f,
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0x010a00, 0x010a06,
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0x010a0c, 0x010a33,
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0x010a38, 0x010a3a,
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0x010a3f, 0x010a47,
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0x010a50, 0x010a58,
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0x010a60, 0x010a7f,
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0x010b00, 0x010b35,
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0x010b39, 0x010b55,
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0x010b58, 0x010b72,
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0x010b78, 0x010b7f,
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0x010c00, 0x010c48,
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0x010e60, 0x010e7e,
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0x011000, 0x01104d,
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0x011052, 0x01106f,
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0x011080, 0x0110c1,
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0x012000, 0x01236e,
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0x012400, 0x012462,
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0x012470, 0x012473,
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0x013000, 0x01342e,
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0x016800, 0x016a38,
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0x01b000, 0x01b001,
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0x01d000, 0x01d0f5,
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0x01d100, 0x01d126,
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0x01d129, 0x01d172,
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0x01d17b, 0x01d1dd,
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0x01d200, 0x01d245,
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0x01d300, 0x01d356,
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0x01d360, 0x01d371,
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0x01d400, 0x01d49f,
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0x01d4a2, 0x01d4a2,
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0x01d4a5, 0x01d4a6,
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0x01d4a9, 0x01d50a,
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0x01d50d, 0x01d546,
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0x01d54a, 0x01d6a5,
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0x01d6a8, 0x01d7cb,
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0x01d7ce, 0x01d7ff,
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0x01f000, 0x01f02b,
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0x01f030, 0x01f093,
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0x01f0a0, 0x01f0ae,
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0x01f0b1, 0x01f0be,
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0x01f0c1, 0x01f0df,
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0x01f100, 0x01f10a,
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0x01f110, 0x01f169,
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0x01f170, 0x01f19a,
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0x01f1e6, 0x01f202,
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0x01f210, 0x01f23a,
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0x01f240, 0x01f248,
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0x01f250, 0x01f251,
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0x01f300, 0x01f320,
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0x01f330, 0x01f37c,
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0x01f380, 0x01f393,
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0x01f3a0, 0x01f3ca,
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0x01f3e0, 0x01f3f0,
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0x01f400, 0x01f4fc,
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0x01f500, 0x01f53d,
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0x01f550, 0x01f567,
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0x01f5fb, 0x01f625,
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0x01f628, 0x01f62d,
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0x01f630, 0x01f640,
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0x01f645, 0x01f64f,
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0x01f680, 0x01f6c5,
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0x01f700, 0x01f773,
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0x020000, 0x02a6d6,
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0x02a700, 0x02b734,
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0x02b740, 0x02b81d,
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0x02f800, 0x02fa1d,
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0x0e0100, 0x0e01ef,
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}
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var isNotPrint32 = []uint32{
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0x1000c,
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0x10027,
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0x1003b,
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0x1003e,
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0x1031f,
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0x1039e,
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0x10809,
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0x10836,
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0x10856,
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0x10a04,
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0x10a14,
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0x10a18,
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0x110bd,
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0x1d455,
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0x1d49d,
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0x1d4ad,
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0x1d4ba,
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0x1d4bc,
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0x1d4c4,
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0x1d506,
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0x1d515,
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0x1d51d,
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0x1d53a,
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0x1d53f,
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0x1d545,
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0x1d551,
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0x1f0d0,
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0x1f12f,
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0x1f336,
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0x1f3c5,
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0x1f43f,
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0x1f441,
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0x1f4f8,
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0x1f600,
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0x1f611,
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0x1f615,
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0x1f617,
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0x1f619,
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0x1f61b,
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0x1f61f,
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0x1f62c,
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0x1f634,
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var isNotPrint32 = []uint16{ // add 0x10000 to each entry
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0x000c,
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0x0027,
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0x003b,
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0x003e,
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0x031f,
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0x039e,
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0x0809,
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0x0836,
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0x0856,
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0x0a04,
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0x0a14,
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0x0a18,
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0x10bd,
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0xd455,
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0xd49d,
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0xd4ad,
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0xd4ba,
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0xd4bc,
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0xd4c4,
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0xd506,
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0xd515,
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0xd51d,
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0xd53a,
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0xd53f,
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0xd545,
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0xd551,
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0xf0d0,
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0xf12f,
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0xf336,
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0xf3c5,
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0xf43f,
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0xf441,
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0xf4f8,
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0xf600,
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0xf611,
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0xf615,
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0xf617,
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0xf619,
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0xf61b,
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0xf61f,
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0xf62c,
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0xf634,
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}
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@ -9,6 +9,7 @@ package main
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import (
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"fmt"
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"os"
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"unicode"
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)
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@ -116,8 +117,8 @@ func main() {
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for i := rune(0); i <= unicode.MaxRune; i++ {
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if isPrint(i) != unicode.IsPrint(i) {
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fmt.Printf("%U: isPrint=%v, want %v\n", i, isPrint(i), unicode.IsPrint(i))
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break
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fmt.Fprintf(os.Stderr, "%U: isPrint=%v, want %v\n", i, isPrint(i), unicode.IsPrint(i))
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return
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}
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}
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@ -125,11 +126,11 @@ func main() {
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fmt.Printf("// go run makeisprint.go >x && mv x isprint.go\n\n")
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fmt.Printf("package strconv\n\n")
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fmt.Printf("// (%d+%d)*2 + (%d+%d)*4 = %d bytes\n\n",
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len(range16), len(except16),
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len(range32), len(except32),
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(len(range16)+len(except16))*2+
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(len(range32)+len(except32))*4)
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fmt.Printf("// (%d+%d+%d)*2 + (%d)*4 = %d bytes\n\n",
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len(range16), len(except16), len(except32),
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len(range32),
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(len(range16)+len(except16)+len(except32))*2+
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(len(range32))*4)
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fmt.Printf("var isPrint16 = []uint16{\n")
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for i := 0; i < len(range16); i += 2 {
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@ -145,13 +146,17 @@ func main() {
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fmt.Printf("var isPrint32 = []uint32{\n")
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for i := 0; i < len(range32); i += 2 {
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fmt.Printf("\t%#06x, %#06x,\n", range16[i], range16[i+1])
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fmt.Printf("\t%#06x, %#06x,\n", range32[i], range32[i+1])
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}
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fmt.Printf("}\n\n")
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fmt.Printf("var isNotPrint32 = []uint32{\n")
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fmt.Printf("var isNotPrint32 = []uint16{ // add 0x10000 to each entry\n")
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for _, r := range except32 {
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fmt.Printf("\t%#04x,\n", r)
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if r >= 0x20000 {
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fmt.Fprintf(os.Stderr, "%U too big for isNotPrint32\n", r)
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return
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}
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fmt.Printf("\t%#04x,\n", r-0x10000)
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}
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fmt.Printf("}\n")
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}
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@ -5,8 +5,6 @@
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package strconv
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import (
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"strings"
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"unicode"
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"unicode/utf8"
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)
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@ -34,11 +32,11 @@ func quoteWith(s string, quote byte, ASCIIonly bool) string {
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continue
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}
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if ASCIIonly {
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if r <= unicode.MaxASCII && unicode.IsPrint(r) {
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if r < utf8.RuneSelf && IsPrint(r) {
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buf = append(buf, byte(r))
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continue
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}
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} else if unicode.IsPrint(r) {
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} else if IsPrint(r) {
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n := utf8.EncodeRune(runeTmp[:], r)
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buf = append(buf, runeTmp[:n]...)
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continue
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@ -64,7 +62,7 @@ func quoteWith(s string, quote byte, ASCIIonly bool) string {
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buf = append(buf, `\x`...)
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buf = append(buf, lowerhex[s[0]>>4])
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buf = append(buf, lowerhex[s[0]&0xF])
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case r > unicode.MaxRune:
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case r > utf8.MaxRune:
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r = 0xFFFD
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fallthrough
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case r < 0x10000:
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@ -88,7 +86,7 @@ func quoteWith(s string, quote byte, ASCIIonly bool) string {
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// Quote returns a double-quoted Go string literal representing s. The
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// returned string uses Go escape sequences (\t, \n, \xFF, \u0100) for
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// control characters and non-printable characters as defined by
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// unicode.IsPrint.
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// IsPrint.
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func Quote(s string) string {
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return quoteWith(s, '"', false)
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}
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@ -101,8 +99,7 @@ func AppendQuote(dst []byte, s string) []byte {
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// QuoteToASCII returns a double-quoted Go string literal representing s.
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// The returned string uses Go escape sequences (\t, \n, \xFF, \u0100) for
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// non-ASCII characters and non-printable characters as defined by
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// unicode.IsPrint.
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// non-ASCII characters and non-printable characters as defined by IsPrint.
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func QuoteToASCII(s string) string {
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return quoteWith(s, '"', true)
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}
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@ -115,8 +112,7 @@ func AppendQuoteToASCII(dst []byte, s string) []byte {
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// QuoteRune returns a single-quoted Go character literal representing the
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// rune. The returned string uses Go escape sequences (\t, \n, \xFF, \u0100)
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// for control characters and non-printable characters as defined by
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// unicode.IsPrint.
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// for control characters and non-printable characters as defined by IsPrint.
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func QuoteRune(r rune) string {
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// TODO: avoid the allocation here.
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return quoteWith(string(r), '\'', false)
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@ -131,7 +127,7 @@ func AppendQuoteRune(dst []byte, r rune) []byte {
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// QuoteRuneToASCII returns a single-quoted Go character literal representing
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// the rune. The returned string uses Go escape sequences (\t, \n, \xFF,
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// \u0100) for non-ASCII characters and non-printable characters as defined
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// by unicode.IsPrint.
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// by IsPrint.
|
||||
func QuoteRuneToASCII(r rune) string {
|
||||
// TODO: avoid the allocation here.
|
||||
return quoteWith(string(r), '\'', true)
|
||||
@ -246,7 +242,7 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
|
||||
value = v
|
||||
break
|
||||
}
|
||||
if v > unicode.MaxRune {
|
||||
if v > utf8.MaxRune {
|
||||
err = ErrSyntax
|
||||
return
|
||||
}
|
||||
@ -305,7 +301,7 @@ func Unquote(s string) (t string, err error) {
|
||||
s = s[1 : n-1]
|
||||
|
||||
if quote == '`' {
|
||||
if strings.Contains(s, "`") {
|
||||
if contains(s, '`') {
|
||||
return "", ErrSyntax
|
||||
}
|
||||
return s, nil
|
||||
@ -313,12 +309,12 @@ func Unquote(s string) (t string, err error) {
|
||||
if quote != '"' && quote != '\'' {
|
||||
return "", ErrSyntax
|
||||
}
|
||||
if strings.Index(s, "\n") >= 0 {
|
||||
if contains(s, '\n') {
|
||||
return "", ErrSyntax
|
||||
}
|
||||
|
||||
// Is it trivial? Avoid allocation.
|
||||
if strings.Index(s, `\`) < 0 && strings.IndexRune(s, rune(quote)) < 0 {
|
||||
if !contains(s, '\\') && !contains(s, quote) {
|
||||
switch quote {
|
||||
case '"':
|
||||
return s, nil
|
||||
@ -352,6 +348,16 @@ func Unquote(s string) (t string, err error) {
|
||||
return string(buf), nil
|
||||
}
|
||||
|
||||
// contains reports whether the string contains the byte c.
|
||||
func contains(s string, c byte) bool {
|
||||
for i := 0; i < len(s); i++ {
|
||||
if s[i] == c {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// bsearch16 returns the smallest i such that a[i] >= x.
|
||||
// If there is no such i, bsearch16 returns len(a).
|
||||
func bsearch16(a []uint16, x uint16) int {
|
||||
@ -382,7 +388,29 @@ func bsearch32(a []uint32, x uint32) int {
|
||||
return i
|
||||
}
|
||||
|
||||
func isPrint(r rune) bool {
|
||||
// TODO: IsPrint is a local implementation of unicode.IsPrint, verified by the tests
|
||||
// to give the same answer. It allows this package not to depend on unicode,
|
||||
// and therefore not pull in all the Unicode tables. If the linker were better
|
||||
// at tossing unused tables, we could get rid of this implementation.
|
||||
// That would be nice.
|
||||
|
||||
// IsPrint reports whether the rune is defined as printable by Go, with
|
||||
// the same definition as unicode.IsPrint: letters, numbers, punctuation,
|
||||
// symbols and ASCII space.
|
||||
func IsPrint(r rune) bool {
|
||||
// Fast check for Latin-1
|
||||
if r <= 0xFF {
|
||||
if 0x20 <= r && r <= 0x7E {
|
||||
// All the ASCII is printable from space through DEL-1.
|
||||
return true
|
||||
}
|
||||
if 0xA1 <= r && r <= 0xFF {
|
||||
// Similarly for ¡ through ÿ...
|
||||
return r != 0xAD // ...except for the bizarre soft hyphen.
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// Same algorithm, either on uint16 or uint32 value.
|
||||
// First, find first i such that isPrint[i] >= x.
|
||||
// This is the index of either the start or end of a pair that might span x.
|
||||
@ -404,6 +432,10 @@ func isPrint(r rune) bool {
|
||||
if i >= len(isPrint) || rr < isPrint[i&^1] || isPrint[i|1] < rr {
|
||||
return false
|
||||
}
|
||||
j := bsearch32(isNotPrint, rr)
|
||||
return j >= len(isNotPrint) || isNotPrint[j] != rr
|
||||
if r >= 0x20000 {
|
||||
return true
|
||||
}
|
||||
r -= 0x10000
|
||||
j := bsearch16(isNotPrint, uint16(r))
|
||||
return j >= len(isNotPrint) || isNotPrint[j] != uint16(r)
|
||||
}
|
||||
|
||||
@ -7,8 +7,23 @@ package strconv_test
|
||||
import (
|
||||
. "strconv"
|
||||
"testing"
|
||||
"unicode"
|
||||
)
|
||||
|
||||
// Verify that our isPrint agrees with unicode.IsPrint
|
||||
func TestIsPrint(t *testing.T) {
|
||||
n := 0
|
||||
for r := rune(0); r <= unicode.MaxRune; r++ {
|
||||
if IsPrint(r) != unicode.IsPrint(r) {
|
||||
t.Errorf("IsPrint(%U)=%t incorrect", r, IsPrint(r))
|
||||
n++
|
||||
if n > 10 {
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type quoteTest struct {
|
||||
in string
|
||||
out string
|
||||
|
||||
Loading…
Reference in New Issue
Block a user