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Run clang-format
This commit is contained in:
Jesse Beder
851
src/stream.cpp
851
src/stream.cpp
@@ -6,442 +6,439 @@
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#define YAML_PREFETCH_SIZE 2048
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#endif
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#define S_ARRAY_SIZE( A ) (sizeof(A)/sizeof(*(A)))
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#define S_ARRAY_END( A ) ((A) + S_ARRAY_SIZE(A))
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#define S_ARRAY_SIZE(A) (sizeof(A) / sizeof(*(A)))
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#define S_ARRAY_END(A) ((A) + S_ARRAY_SIZE(A))
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#define CP_REPLACEMENT_CHARACTER (0xFFFD)
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namespace YAML
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{
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enum UtfIntroState {
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uis_start,
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uis_utfbe_b1,
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uis_utf32be_b2,
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uis_utf32be_bom3,
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uis_utf32be,
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uis_utf16be,
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uis_utf16be_bom1,
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uis_utfle_bom1,
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uis_utf16le_bom2,
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uis_utf32le_bom3,
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uis_utf16le,
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uis_utf32le,
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uis_utf8_imp,
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uis_utf16le_imp,
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uis_utf32le_imp3,
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uis_utf8_bom1,
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uis_utf8_bom2,
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uis_utf8,
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uis_error
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};
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namespace YAML {
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enum UtfIntroState {
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uis_start,
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uis_utfbe_b1,
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uis_utf32be_b2,
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uis_utf32be_bom3,
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uis_utf32be,
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uis_utf16be,
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uis_utf16be_bom1,
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uis_utfle_bom1,
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uis_utf16le_bom2,
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uis_utf32le_bom3,
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uis_utf16le,
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uis_utf32le,
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uis_utf8_imp,
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uis_utf16le_imp,
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uis_utf32le_imp3,
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uis_utf8_bom1,
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uis_utf8_bom2,
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uis_utf8,
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uis_error
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};
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enum UtfIntroCharType {
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uict00,
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uictBB,
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uictBF,
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uictEF,
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uictFE,
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uictFF,
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uictAscii,
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uictOther,
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uictMax
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};
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enum UtfIntroCharType {
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uict00,
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uictBB,
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uictBF,
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uictEF,
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uictFE,
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uictFF,
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uictAscii,
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uictOther,
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uictMax
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};
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static bool s_introFinalState[] = {
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false, //uis_start
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false, //uis_utfbe_b1
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false, //uis_utf32be_b2
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false, //uis_utf32be_bom3
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true, //uis_utf32be
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true, //uis_utf16be
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false, //uis_utf16be_bom1
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false, //uis_utfle_bom1
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false, //uis_utf16le_bom2
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false, //uis_utf32le_bom3
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true, //uis_utf16le
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true, //uis_utf32le
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false, //uis_utf8_imp
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false, //uis_utf16le_imp
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false, //uis_utf32le_imp3
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false, //uis_utf8_bom1
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false, //uis_utf8_bom2
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true, //uis_utf8
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true, //uis_error
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};
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static bool s_introFinalState[] = {false, // uis_start
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false, // uis_utfbe_b1
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false, // uis_utf32be_b2
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false, // uis_utf32be_bom3
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true, // uis_utf32be
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true, // uis_utf16be
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false, // uis_utf16be_bom1
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false, // uis_utfle_bom1
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false, // uis_utf16le_bom2
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false, // uis_utf32le_bom3
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true, // uis_utf16le
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true, // uis_utf32le
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false, // uis_utf8_imp
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false, // uis_utf16le_imp
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false, // uis_utf32le_imp3
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false, // uis_utf8_bom1
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false, // uis_utf8_bom2
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true, // uis_utf8
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true, // uis_error
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};
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static UtfIntroState s_introTransitions[][uictMax] = {
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// uict00, uictBB, uictBF, uictEF, uictFE, uictFF, uictAscii, uictOther
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{uis_utfbe_b1, uis_utf8, uis_utf8, uis_utf8_bom1, uis_utf16be_bom1, uis_utfle_bom1, uis_utf8_imp, uis_utf8},
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{uis_utf32be_b2, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf16be, uis_utf8},
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{uis_utf32be, uis_utf8, uis_utf8, uis_utf8, uis_utf32be_bom3, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf32be, uis_utf8, uis_utf8},
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{uis_utf32be, uis_utf32be, uis_utf32be, uis_utf32be, uis_utf32be, uis_utf32be, uis_utf32be, uis_utf32be},
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{uis_utf16be, uis_utf16be, uis_utf16be, uis_utf16be, uis_utf16be, uis_utf16be, uis_utf16be, uis_utf16be},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf16be, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf16le_bom2, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf32le_bom3, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf32le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf32le, uis_utf32le, uis_utf32le, uis_utf32le, uis_utf32le, uis_utf32le, uis_utf32le, uis_utf32le},
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{uis_utf16le_imp, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf32le_imp3, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf32le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf8, uis_utf8_bom2, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8, uis_utf8},
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};
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static UtfIntroState s_introTransitions[][uictMax] = {
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// uict00, uictBB, uictBF, uictEF,
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// uictFE, uictFF, uictAscii, uictOther
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{uis_utfbe_b1, uis_utf8, uis_utf8, uis_utf8_bom1,
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uis_utf16be_bom1, uis_utfle_bom1, uis_utf8_imp, uis_utf8},
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{uis_utf32be_b2, uis_utf8, uis_utf8, uis_utf8,
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uis_utf8, uis_utf8, uis_utf16be, uis_utf8},
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{uis_utf32be, uis_utf8, uis_utf8, uis_utf8,
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uis_utf32be_bom3, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8,
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uis_utf8, uis_utf32be, uis_utf8, uis_utf8},
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{uis_utf32be, uis_utf32be, uis_utf32be, uis_utf32be,
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uis_utf32be, uis_utf32be, uis_utf32be, uis_utf32be},
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{uis_utf16be, uis_utf16be, uis_utf16be, uis_utf16be,
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uis_utf16be, uis_utf16be, uis_utf16be, uis_utf16be},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8,
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uis_utf8, uis_utf16be, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8,
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uis_utf16le_bom2, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf32le_bom3, uis_utf16le, uis_utf16le, uis_utf16le,
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uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf32le, uis_utf16le, uis_utf16le, uis_utf16le,
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uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le,
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uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf32le, uis_utf32le, uis_utf32le, uis_utf32le,
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uis_utf32le, uis_utf32le, uis_utf32le, uis_utf32le},
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{uis_utf16le_imp, uis_utf8, uis_utf8, uis_utf8,
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uis_utf8, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf32le_imp3, uis_utf16le, uis_utf16le, uis_utf16le,
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uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf32le, uis_utf16le, uis_utf16le, uis_utf16le,
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uis_utf16le, uis_utf16le, uis_utf16le, uis_utf16le},
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{uis_utf8, uis_utf8_bom2, uis_utf8, uis_utf8,
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uis_utf8, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8,
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uis_utf8, uis_utf8, uis_utf8, uis_utf8},
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{uis_utf8, uis_utf8, uis_utf8, uis_utf8,
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uis_utf8, uis_utf8, uis_utf8, uis_utf8}, };
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static char s_introUngetCount[][uictMax] = {
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// uict00, uictBB, uictBF, uictEF, uictFE, uictFF, uictAscii, uictOther
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{0, 1, 1, 0, 0, 0, 0, 1},
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{0, 2, 2, 2, 2, 2, 2, 2},
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{3, 3, 3, 3, 0, 3, 3, 3},
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{4, 4, 4, 4, 4, 0, 4, 4},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{2, 2, 2, 2, 2, 0, 2, 2},
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{2, 2, 2, 2, 0, 2, 2, 2},
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{0, 1, 1, 1, 1, 1, 1, 1},
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{0, 2, 2, 2, 2, 2, 2, 2},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{0, 2, 2, 2, 2, 2, 2, 2},
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{0, 3, 3, 3, 3, 3, 3, 3},
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{4, 4, 4, 4, 4, 4, 4, 4},
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{2, 0, 2, 2, 2, 2, 2, 2},
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{3, 3, 0, 3, 3, 3, 3, 3},
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{1, 1, 1, 1, 1, 1, 1, 1},
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};
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static char s_introUngetCount[][uictMax] = {
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// uict00, uictBB, uictBF, uictEF, uictFE, uictFF, uictAscii, uictOther
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{0, 1, 1, 0, 0, 0, 0, 1},
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{0, 2, 2, 2, 2, 2, 2, 2},
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{3, 3, 3, 3, 0, 3, 3, 3},
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{4, 4, 4, 4, 4, 0, 4, 4},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{2, 2, 2, 2, 2, 0, 2, 2},
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{2, 2, 2, 2, 0, 2, 2, 2},
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{0, 1, 1, 1, 1, 1, 1, 1},
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{0, 2, 2, 2, 2, 2, 2, 2},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{1, 1, 1, 1, 1, 1, 1, 1},
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{0, 2, 2, 2, 2, 2, 2, 2},
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{0, 3, 3, 3, 3, 3, 3, 3},
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{4, 4, 4, 4, 4, 4, 4, 4},
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{2, 0, 2, 2, 2, 2, 2, 2},
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{3, 3, 0, 3, 3, 3, 3, 3},
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{1, 1, 1, 1, 1, 1, 1, 1}, };
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inline UtfIntroCharType IntroCharTypeOf(std::istream::int_type ch)
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{
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if (std::istream::traits_type::eof() == ch) {
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return uictOther;
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}
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inline UtfIntroCharType IntroCharTypeOf(std::istream::int_type ch) {
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if (std::istream::traits_type::eof() == ch) {
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return uictOther;
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}
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switch (ch) {
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case 0: return uict00;
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case 0xBB: return uictBB;
|
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case 0xBF: return uictBF;
|
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case 0xEF: return uictEF;
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case 0xFE: return uictFE;
|
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case 0xFF: return uictFF;
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}
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switch (ch) {
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case 0:
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return uict00;
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case 0xBB:
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return uictBB;
|
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case 0xBF:
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return uictBF;
|
||||
case 0xEF:
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return uictEF;
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case 0xFE:
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return uictFE;
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case 0xFF:
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return uictFF;
|
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}
|
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|
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if ((ch > 0) && (ch < 0xFF)) {
|
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return uictAscii;
|
||||
}
|
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if ((ch > 0) && (ch < 0xFF)) {
|
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return uictAscii;
|
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}
|
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|
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return uictOther;
|
||||
}
|
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|
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inline char Utf8Adjust(unsigned long ch, unsigned char lead_bits, unsigned char rshift)
|
||||
{
|
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const unsigned char header = ((1 << lead_bits) - 1) << (8 - lead_bits);
|
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const unsigned char mask = (0xFF >> (lead_bits + 1));
|
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return static_cast<char>(static_cast<unsigned char>(
|
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header | ((ch >> rshift) & mask)
|
||||
));
|
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}
|
||||
|
||||
inline void QueueUnicodeCodepoint(std::deque<char>& q, unsigned long ch)
|
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{
|
||||
// We are not allowed to queue the Stream::eof() codepoint, so
|
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// replace it with CP_REPLACEMENT_CHARACTER
|
||||
if (static_cast<unsigned long>(Stream::eof()) == ch)
|
||||
{
|
||||
ch = CP_REPLACEMENT_CHARACTER;
|
||||
}
|
||||
|
||||
if (ch < 0x80)
|
||||
{
|
||||
q.push_back(Utf8Adjust(ch, 0, 0));
|
||||
}
|
||||
else if (ch < 0x800)
|
||||
{
|
||||
q.push_back(Utf8Adjust(ch, 2, 6));
|
||||
q.push_back(Utf8Adjust(ch, 1, 0));
|
||||
}
|
||||
else if (ch < 0x10000)
|
||||
{
|
||||
q.push_back(Utf8Adjust(ch, 3, 12));
|
||||
q.push_back(Utf8Adjust(ch, 1, 6));
|
||||
q.push_back(Utf8Adjust(ch, 1, 0));
|
||||
}
|
||||
else
|
||||
{
|
||||
q.push_back(Utf8Adjust(ch, 4, 18));
|
||||
q.push_back(Utf8Adjust(ch, 1, 12));
|
||||
q.push_back(Utf8Adjust(ch, 1, 6));
|
||||
q.push_back(Utf8Adjust(ch, 1, 0));
|
||||
}
|
||||
}
|
||||
|
||||
Stream::Stream(std::istream& input)
|
||||
: m_input(input),
|
||||
m_pPrefetched(new unsigned char[YAML_PREFETCH_SIZE]),
|
||||
m_nPrefetchedAvailable(0), m_nPrefetchedUsed(0)
|
||||
{
|
||||
typedef std::istream::traits_type char_traits;
|
||||
|
||||
if(!input)
|
||||
return;
|
||||
|
||||
// Determine (or guess) the character-set by reading the BOM, if any. See
|
||||
// the YAML specification for the determination algorithm.
|
||||
char_traits::int_type intro[4];
|
||||
int nIntroUsed = 0;
|
||||
UtfIntroState state = uis_start;
|
||||
for(; !s_introFinalState[state]; ) {
|
||||
std::istream::int_type ch = input.get();
|
||||
intro[nIntroUsed++] = ch;
|
||||
UtfIntroCharType charType = IntroCharTypeOf(ch);
|
||||
UtfIntroState newState = s_introTransitions[state][charType];
|
||||
int nUngets = s_introUngetCount[state][charType];
|
||||
if(nUngets > 0) {
|
||||
input.clear();
|
||||
for(; nUngets > 0; --nUngets) {
|
||||
if(char_traits::eof() != intro[--nIntroUsed])
|
||||
input.putback(char_traits::to_char_type(intro[nIntroUsed]));
|
||||
}
|
||||
}
|
||||
state = newState;
|
||||
}
|
||||
|
||||
switch (state) {
|
||||
case uis_utf8: m_charSet = utf8; break;
|
||||
case uis_utf16le: m_charSet = utf16le; break;
|
||||
case uis_utf16be: m_charSet = utf16be; break;
|
||||
case uis_utf32le: m_charSet = utf32le; break;
|
||||
case uis_utf32be: m_charSet = utf32be; break;
|
||||
default: m_charSet = utf8; break;
|
||||
}
|
||||
|
||||
ReadAheadTo(0);
|
||||
}
|
||||
|
||||
Stream::~Stream()
|
||||
{
|
||||
delete[] m_pPrefetched;
|
||||
}
|
||||
|
||||
char Stream::peek() const
|
||||
{
|
||||
if (m_readahead.empty())
|
||||
{
|
||||
return Stream::eof();
|
||||
}
|
||||
|
||||
return m_readahead[0];
|
||||
}
|
||||
|
||||
Stream::operator bool() const
|
||||
{
|
||||
return m_input.good() || (!m_readahead.empty() && m_readahead[0] != Stream::eof());
|
||||
}
|
||||
|
||||
// get
|
||||
// . Extracts a character from the stream and updates our position
|
||||
char Stream::get()
|
||||
{
|
||||
char ch = peek();
|
||||
AdvanceCurrent();
|
||||
m_mark.column++;
|
||||
|
||||
if(ch == '\n') {
|
||||
m_mark.column = 0;
|
||||
m_mark.line++;
|
||||
}
|
||||
|
||||
return ch;
|
||||
}
|
||||
|
||||
// get
|
||||
// . Extracts 'n' characters from the stream and updates our position
|
||||
std::string Stream::get(int n)
|
||||
{
|
||||
std::string ret;
|
||||
ret.reserve(n);
|
||||
for(int i=0;i<n;i++)
|
||||
ret += get();
|
||||
return ret;
|
||||
}
|
||||
|
||||
// eat
|
||||
// . Eats 'n' characters and updates our position.
|
||||
void Stream::eat(int n)
|
||||
{
|
||||
for(int i=0;i<n;i++)
|
||||
get();
|
||||
}
|
||||
|
||||
void Stream::AdvanceCurrent()
|
||||
{
|
||||
if (!m_readahead.empty())
|
||||
{
|
||||
m_readahead.pop_front();
|
||||
m_mark.pos++;
|
||||
}
|
||||
|
||||
ReadAheadTo(0);
|
||||
}
|
||||
|
||||
bool Stream::_ReadAheadTo(size_t i) const
|
||||
{
|
||||
while (m_input.good() && (m_readahead.size() <= i))
|
||||
{
|
||||
switch (m_charSet)
|
||||
{
|
||||
case utf8: StreamInUtf8(); break;
|
||||
case utf16le: StreamInUtf16(); break;
|
||||
case utf16be: StreamInUtf16(); break;
|
||||
case utf32le: StreamInUtf32(); break;
|
||||
case utf32be: StreamInUtf32(); break;
|
||||
}
|
||||
}
|
||||
|
||||
// signal end of stream
|
||||
if(!m_input.good())
|
||||
m_readahead.push_back(Stream::eof());
|
||||
|
||||
return m_readahead.size() > i;
|
||||
}
|
||||
|
||||
void Stream::StreamInUtf8() const
|
||||
{
|
||||
unsigned char b = GetNextByte();
|
||||
if (m_input.good())
|
||||
{
|
||||
m_readahead.push_back(b);
|
||||
}
|
||||
}
|
||||
|
||||
void Stream::StreamInUtf16() const
|
||||
{
|
||||
unsigned long ch = 0;
|
||||
unsigned char bytes[2];
|
||||
int nBigEnd = (m_charSet == utf16be) ? 0 : 1;
|
||||
|
||||
bytes[0] = GetNextByte();
|
||||
bytes[1] = GetNextByte();
|
||||
if (!m_input.good())
|
||||
{
|
||||
return;
|
||||
}
|
||||
ch = (static_cast<unsigned long>(bytes[nBigEnd]) << 8) |
|
||||
static_cast<unsigned long>(bytes[1 ^ nBigEnd]);
|
||||
|
||||
if (ch >= 0xDC00 && ch < 0xE000)
|
||||
{
|
||||
// Trailing (low) surrogate...ugh, wrong order
|
||||
QueueUnicodeCodepoint(m_readahead, CP_REPLACEMENT_CHARACTER);
|
||||
return;
|
||||
}
|
||||
else if (ch >= 0xD800 && ch < 0xDC00)
|
||||
{
|
||||
// ch is a leading (high) surrogate
|
||||
|
||||
// Four byte UTF-8 code point
|
||||
|
||||
// Read the trailing (low) surrogate
|
||||
for (;;)
|
||||
{
|
||||
bytes[0] = GetNextByte();
|
||||
bytes[1] = GetNextByte();
|
||||
if (!m_input.good())
|
||||
{
|
||||
QueueUnicodeCodepoint(m_readahead, CP_REPLACEMENT_CHARACTER);
|
||||
return;
|
||||
}
|
||||
unsigned long chLow = (static_cast<unsigned long>(bytes[nBigEnd]) << 8) |
|
||||
static_cast<unsigned long>(bytes[1 ^ nBigEnd]);
|
||||
if (chLow < 0xDC00 || ch >= 0xE000)
|
||||
{
|
||||
// Trouble...not a low surrogate. Dump a REPLACEMENT CHARACTER into the stream.
|
||||
QueueUnicodeCodepoint(m_readahead, CP_REPLACEMENT_CHARACTER);
|
||||
|
||||
// Deal with the next UTF-16 unit
|
||||
if (chLow < 0xD800 || ch >= 0xE000)
|
||||
{
|
||||
// Easiest case: queue the codepoint and return
|
||||
QueueUnicodeCodepoint(m_readahead, ch);
|
||||
return;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Start the loop over with the new high surrogate
|
||||
ch = chLow;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
// Select the payload bits from the high surrogate
|
||||
ch &= 0x3FF;
|
||||
ch <<= 10;
|
||||
|
||||
// Include bits from low surrogate
|
||||
ch |= (chLow & 0x3FF);
|
||||
|
||||
// Add the surrogacy offset
|
||||
ch += 0x10000;
|
||||
}
|
||||
}
|
||||
|
||||
QueueUnicodeCodepoint(m_readahead, ch);
|
||||
}
|
||||
|
||||
inline char* ReadBuffer(unsigned char* pBuffer)
|
||||
{
|
||||
return reinterpret_cast<char*>(pBuffer);
|
||||
}
|
||||
|
||||
unsigned char Stream::GetNextByte() const
|
||||
{
|
||||
if (m_nPrefetchedUsed >= m_nPrefetchedAvailable)
|
||||
{
|
||||
std::streambuf *pBuf = m_input.rdbuf();
|
||||
m_nPrefetchedAvailable = static_cast<std::size_t>(pBuf->sgetn(ReadBuffer(m_pPrefetched), YAML_PREFETCH_SIZE));
|
||||
m_nPrefetchedUsed = 0;
|
||||
if (!m_nPrefetchedAvailable)
|
||||
{
|
||||
m_input.setstate(std::ios_base::eofbit);
|
||||
}
|
||||
|
||||
if (0 == m_nPrefetchedAvailable)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
return m_pPrefetched[m_nPrefetchedUsed++];
|
||||
}
|
||||
|
||||
void Stream::StreamInUtf32() const
|
||||
{
|
||||
static int indexes[2][4] = {
|
||||
{3, 2, 1, 0},
|
||||
{0, 1, 2, 3}
|
||||
};
|
||||
|
||||
unsigned long ch = 0;
|
||||
unsigned char bytes[4];
|
||||
int* pIndexes = (m_charSet == utf32be) ? indexes[1] : indexes[0];
|
||||
|
||||
bytes[0] = GetNextByte();
|
||||
bytes[1] = GetNextByte();
|
||||
bytes[2] = GetNextByte();
|
||||
bytes[3] = GetNextByte();
|
||||
if (!m_input.good())
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
for (int i = 0; i < 4; ++i)
|
||||
{
|
||||
ch <<= 8;
|
||||
ch |= bytes[pIndexes[i]];
|
||||
}
|
||||
|
||||
QueueUnicodeCodepoint(m_readahead, ch);
|
||||
}
|
||||
return uictOther;
|
||||
}
|
||||
|
||||
inline char Utf8Adjust(unsigned long ch, unsigned char lead_bits,
|
||||
unsigned char rshift) {
|
||||
const unsigned char header = ((1 << lead_bits) - 1) << (8 - lead_bits);
|
||||
const unsigned char mask = (0xFF >> (lead_bits + 1));
|
||||
return static_cast<char>(
|
||||
static_cast<unsigned char>(header | ((ch >> rshift) & mask)));
|
||||
}
|
||||
|
||||
inline void QueueUnicodeCodepoint(std::deque<char>& q, unsigned long ch) {
|
||||
// We are not allowed to queue the Stream::eof() codepoint, so
|
||||
// replace it with CP_REPLACEMENT_CHARACTER
|
||||
if (static_cast<unsigned long>(Stream::eof()) == ch) {
|
||||
ch = CP_REPLACEMENT_CHARACTER;
|
||||
}
|
||||
|
||||
if (ch < 0x80) {
|
||||
q.push_back(Utf8Adjust(ch, 0, 0));
|
||||
} else if (ch < 0x800) {
|
||||
q.push_back(Utf8Adjust(ch, 2, 6));
|
||||
q.push_back(Utf8Adjust(ch, 1, 0));
|
||||
} else if (ch < 0x10000) {
|
||||
q.push_back(Utf8Adjust(ch, 3, 12));
|
||||
q.push_back(Utf8Adjust(ch, 1, 6));
|
||||
q.push_back(Utf8Adjust(ch, 1, 0));
|
||||
} else {
|
||||
q.push_back(Utf8Adjust(ch, 4, 18));
|
||||
q.push_back(Utf8Adjust(ch, 1, 12));
|
||||
q.push_back(Utf8Adjust(ch, 1, 6));
|
||||
q.push_back(Utf8Adjust(ch, 1, 0));
|
||||
}
|
||||
}
|
||||
|
||||
Stream::Stream(std::istream& input)
|
||||
: m_input(input),
|
||||
m_pPrefetched(new unsigned char[YAML_PREFETCH_SIZE]),
|
||||
m_nPrefetchedAvailable(0),
|
||||
m_nPrefetchedUsed(0) {
|
||||
typedef std::istream::traits_type char_traits;
|
||||
|
||||
if (!input)
|
||||
return;
|
||||
|
||||
// Determine (or guess) the character-set by reading the BOM, if any. See
|
||||
// the YAML specification for the determination algorithm.
|
||||
char_traits::int_type intro[4];
|
||||
int nIntroUsed = 0;
|
||||
UtfIntroState state = uis_start;
|
||||
for (; !s_introFinalState[state];) {
|
||||
std::istream::int_type ch = input.get();
|
||||
intro[nIntroUsed++] = ch;
|
||||
UtfIntroCharType charType = IntroCharTypeOf(ch);
|
||||
UtfIntroState newState = s_introTransitions[state][charType];
|
||||
int nUngets = s_introUngetCount[state][charType];
|
||||
if (nUngets > 0) {
|
||||
input.clear();
|
||||
for (; nUngets > 0; --nUngets) {
|
||||
if (char_traits::eof() != intro[--nIntroUsed])
|
||||
input.putback(char_traits::to_char_type(intro[nIntroUsed]));
|
||||
}
|
||||
}
|
||||
state = newState;
|
||||
}
|
||||
|
||||
switch (state) {
|
||||
case uis_utf8:
|
||||
m_charSet = utf8;
|
||||
break;
|
||||
case uis_utf16le:
|
||||
m_charSet = utf16le;
|
||||
break;
|
||||
case uis_utf16be:
|
||||
m_charSet = utf16be;
|
||||
break;
|
||||
case uis_utf32le:
|
||||
m_charSet = utf32le;
|
||||
break;
|
||||
case uis_utf32be:
|
||||
m_charSet = utf32be;
|
||||
break;
|
||||
default:
|
||||
m_charSet = utf8;
|
||||
break;
|
||||
}
|
||||
|
||||
ReadAheadTo(0);
|
||||
}
|
||||
|
||||
Stream::~Stream() { delete[] m_pPrefetched; }
|
||||
|
||||
char Stream::peek() const {
|
||||
if (m_readahead.empty()) {
|
||||
return Stream::eof();
|
||||
}
|
||||
|
||||
return m_readahead[0];
|
||||
}
|
||||
|
||||
Stream::operator bool() const {
|
||||
return m_input.good() ||
|
||||
(!m_readahead.empty() && m_readahead[0] != Stream::eof());
|
||||
}
|
||||
|
||||
// get
|
||||
// . Extracts a character from the stream and updates our position
|
||||
char Stream::get() {
|
||||
char ch = peek();
|
||||
AdvanceCurrent();
|
||||
m_mark.column++;
|
||||
|
||||
if (ch == '\n') {
|
||||
m_mark.column = 0;
|
||||
m_mark.line++;
|
||||
}
|
||||
|
||||
return ch;
|
||||
}
|
||||
|
||||
// get
|
||||
// . Extracts 'n' characters from the stream and updates our position
|
||||
std::string Stream::get(int n) {
|
||||
std::string ret;
|
||||
ret.reserve(n);
|
||||
for (int i = 0; i < n; i++)
|
||||
ret += get();
|
||||
return ret;
|
||||
}
|
||||
|
||||
// eat
|
||||
// . Eats 'n' characters and updates our position.
|
||||
void Stream::eat(int n) {
|
||||
for (int i = 0; i < n; i++)
|
||||
get();
|
||||
}
|
||||
|
||||
void Stream::AdvanceCurrent() {
|
||||
if (!m_readahead.empty()) {
|
||||
m_readahead.pop_front();
|
||||
m_mark.pos++;
|
||||
}
|
||||
|
||||
ReadAheadTo(0);
|
||||
}
|
||||
|
||||
bool Stream::_ReadAheadTo(size_t i) const {
|
||||
while (m_input.good() && (m_readahead.size() <= i)) {
|
||||
switch (m_charSet) {
|
||||
case utf8:
|
||||
StreamInUtf8();
|
||||
break;
|
||||
case utf16le:
|
||||
StreamInUtf16();
|
||||
break;
|
||||
case utf16be:
|
||||
StreamInUtf16();
|
||||
break;
|
||||
case utf32le:
|
||||
StreamInUtf32();
|
||||
break;
|
||||
case utf32be:
|
||||
StreamInUtf32();
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// signal end of stream
|
||||
if (!m_input.good())
|
||||
m_readahead.push_back(Stream::eof());
|
||||
|
||||
return m_readahead.size() > i;
|
||||
}
|
||||
|
||||
void Stream::StreamInUtf8() const {
|
||||
unsigned char b = GetNextByte();
|
||||
if (m_input.good()) {
|
||||
m_readahead.push_back(b);
|
||||
}
|
||||
}
|
||||
|
||||
void Stream::StreamInUtf16() const {
|
||||
unsigned long ch = 0;
|
||||
unsigned char bytes[2];
|
||||
int nBigEnd = (m_charSet == utf16be) ? 0 : 1;
|
||||
|
||||
bytes[0] = GetNextByte();
|
||||
bytes[1] = GetNextByte();
|
||||
if (!m_input.good()) {
|
||||
return;
|
||||
}
|
||||
ch = (static_cast<unsigned long>(bytes[nBigEnd]) << 8) |
|
||||
static_cast<unsigned long>(bytes[1 ^ nBigEnd]);
|
||||
|
||||
if (ch >= 0xDC00 && ch < 0xE000) {
|
||||
// Trailing (low) surrogate...ugh, wrong order
|
||||
QueueUnicodeCodepoint(m_readahead, CP_REPLACEMENT_CHARACTER);
|
||||
return;
|
||||
} else if (ch >= 0xD800 && ch < 0xDC00) {
|
||||
// ch is a leading (high) surrogate
|
||||
|
||||
// Four byte UTF-8 code point
|
||||
|
||||
// Read the trailing (low) surrogate
|
||||
for (;;) {
|
||||
bytes[0] = GetNextByte();
|
||||
bytes[1] = GetNextByte();
|
||||
if (!m_input.good()) {
|
||||
QueueUnicodeCodepoint(m_readahead, CP_REPLACEMENT_CHARACTER);
|
||||
return;
|
||||
}
|
||||
unsigned long chLow = (static_cast<unsigned long>(bytes[nBigEnd]) << 8) |
|
||||
static_cast<unsigned long>(bytes[1 ^ nBigEnd]);
|
||||
if (chLow < 0xDC00 || ch >= 0xE000) {
|
||||
// Trouble...not a low surrogate. Dump a REPLACEMENT CHARACTER into the
|
||||
// stream.
|
||||
QueueUnicodeCodepoint(m_readahead, CP_REPLACEMENT_CHARACTER);
|
||||
|
||||
// Deal with the next UTF-16 unit
|
||||
if (chLow < 0xD800 || ch >= 0xE000) {
|
||||
// Easiest case: queue the codepoint and return
|
||||
QueueUnicodeCodepoint(m_readahead, ch);
|
||||
return;
|
||||
} else {
|
||||
// Start the loop over with the new high surrogate
|
||||
ch = chLow;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
// Select the payload bits from the high surrogate
|
||||
ch &= 0x3FF;
|
||||
ch <<= 10;
|
||||
|
||||
// Include bits from low surrogate
|
||||
ch |= (chLow & 0x3FF);
|
||||
|
||||
// Add the surrogacy offset
|
||||
ch += 0x10000;
|
||||
}
|
||||
}
|
||||
|
||||
QueueUnicodeCodepoint(m_readahead, ch);
|
||||
}
|
||||
|
||||
inline char* ReadBuffer(unsigned char* pBuffer) {
|
||||
return reinterpret_cast<char*>(pBuffer);
|
||||
}
|
||||
|
||||
unsigned char Stream::GetNextByte() const {
|
||||
if (m_nPrefetchedUsed >= m_nPrefetchedAvailable) {
|
||||
std::streambuf* pBuf = m_input.rdbuf();
|
||||
m_nPrefetchedAvailable = static_cast<std::size_t>(
|
||||
pBuf->sgetn(ReadBuffer(m_pPrefetched), YAML_PREFETCH_SIZE));
|
||||
m_nPrefetchedUsed = 0;
|
||||
if (!m_nPrefetchedAvailable) {
|
||||
m_input.setstate(std::ios_base::eofbit);
|
||||
}
|
||||
|
||||
if (0 == m_nPrefetchedAvailable) {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
return m_pPrefetched[m_nPrefetchedUsed++];
|
||||
}
|
||||
|
||||
void Stream::StreamInUtf32() const {
|
||||
static int indexes[2][4] = {{3, 2, 1, 0}, {0, 1, 2, 3}};
|
||||
|
||||
unsigned long ch = 0;
|
||||
unsigned char bytes[4];
|
||||
int* pIndexes = (m_charSet == utf32be) ? indexes[1] : indexes[0];
|
||||
|
||||
bytes[0] = GetNextByte();
|
||||
bytes[1] = GetNextByte();
|
||||
bytes[2] = GetNextByte();
|
||||
bytes[3] = GetNextByte();
|
||||
if (!m_input.good()) {
|
||||
return;
|
||||
}
|
||||
|
||||
for (int i = 0; i < 4; ++i) {
|
||||
ch <<= 8;
|
||||
ch |= bytes[pIndexes[i]];
|
||||
}
|
||||
|
||||
QueueUnicodeCodepoint(m_readahead, ch);
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user