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expose positional index to clients; addresses bblfsh#102
Signed-off-by: Denys Smirnov <[email protected]>
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Denys Smirnov
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Jun 6, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| package main | ||
|
|
||
| /* | ||
| #include "uast.h" | ||
| #include <stdlib.h> | ||
| */ | ||
| import "C" | ||
|
|
||
| import ( | ||
| "sync" | ||
| "unsafe" | ||
|
|
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| "github.com/bblfsh/sdk/v3/uast/transformer/positioner" | ||
| ) | ||
|
|
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| var ( | ||
| srcMu sync.RWMutex | ||
| srcLast Handle | ||
| srcIndexes = make(map[Handle]*positioner.Index) | ||
| ) | ||
|
|
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| // newSourceIndex allocates and populates the UastSourceIndex structure for C code to use. | ||
| func newSourceIndex(h Handle) *C.UastSourceIndex { | ||
| sz := unsafe.Sizeof(C.UastSourceIndex{}) | ||
| v := (*C.UastSourceIndex)(C.malloc(C.size_t(sz))) | ||
| v.handle = C.uintptr_t(h) | ||
| return v | ||
| } | ||
|
|
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| //export UastSourceIndexNew | ||
| // UastSourceIndexNew creates a positional index for a source file. An index can be used | ||
| // to convert byte-based node offsets to Unicode character offsets. | ||
| func UastSourceIndexNew(source unsafe.Pointer, size C.size_t) *C.UastSourceIndex { | ||
| index := positioner.NewIndex(cBytes(source, size), &positioner.IndexOptions{ | ||
| Unicode: true, | ||
| }) | ||
| srcMu.Lock() | ||
| srcLast++ | ||
| h := srcLast | ||
| srcIndexes[h] = index | ||
| srcMu.Unlock() | ||
| return newSourceIndex(h) | ||
| } | ||
|
|
||
| //export UastSourceIndexFree | ||
| // UastSourceIndexFree release all resources associated with an index. | ||
| func UastSourceIndexFree(idx *C.UastSourceIndex) { | ||
| if idx == nil { | ||
| return | ||
| } | ||
| h := idx.handle | ||
| C.free(unsafe.Pointer(idx)) | ||
| if h == 0 { | ||
| return | ||
| } | ||
| srcMu.Lock() | ||
| delete(srcIndexes, Handle(h)) | ||
| srcMu.Unlock() | ||
| } | ||
|
|
||
| // getSourceIndex returns an index for a given handle. It returns nil if handle is invalid. | ||
| func getSourceIndex(h Handle) *positioner.Index { | ||
| srcMu.RLock() | ||
| idx := srcIndexes[h] | ||
| srcMu.RUnlock() | ||
| return idx | ||
| } | ||
|
|
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| // convertOffset is a helper to convert one offset to the other, given a conversion function. | ||
| func convertOffset(fnc func(*positioner.Index, int) (int, error), | ||
| idx *C.UastSourceIndex, off C.int) C.int { | ||
| if idx == nil || idx.handle == 0 || off < 0 { | ||
| return -1 | ||
| } | ||
| index := getSourceIndex(Handle(idx.handle)) | ||
| if index == nil { | ||
| return -1 | ||
| } | ||
| roff, err := fnc(index, int(off)) | ||
| if err != nil { | ||
| // TODO: we should return this error somehow | ||
| // previously we stored it in Context, but we don't have (nor need) it here | ||
| return -1 | ||
| } | ||
| return C.int(roff) | ||
| } | ||
|
|
||
| // convertToLineCol is a helper to convert one offset to the line-column pair, given a conversion function. | ||
| func convertToLineCol(fnc func(*positioner.Index, int) (int, int, error), | ||
| idx *C.UastSourceIndex, off C.int) C.UastLineCol { | ||
| if idx == nil || idx.handle == 0 || off < 0 { | ||
| return C.UastLineCol{-1, -1} | ||
| } | ||
| index := getSourceIndex(Handle(idx.handle)) | ||
| if index == nil { | ||
| return C.UastLineCol{-1, -1} | ||
| } | ||
| line, col, err := fnc(index, int(off)) | ||
| if err != nil { | ||
| // TODO: we should return this error somehow | ||
| // previously we stored it in Context, but we don't have (nor need) it here | ||
| return C.UastLineCol{-1, -1} | ||
| } | ||
| var pos C.UastLineCol | ||
| pos.line = C.int(line) | ||
| pos.col = C.int(col) | ||
| return pos | ||
| } | ||
|
|
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| //export UastSourceIndexFromLineCol | ||
| // UastSourceIndexFromLineCol converts one-based line-column pair (in bytes) in the indexed | ||
| // source file to a zero-based byte offset. It return -1 in case of failure. | ||
| func UastSourceIndexFromLineCol(idx *C.UastSourceIndex, line, col C.int) C.int { | ||
| if idx == nil || idx.handle == 0 || line < 0 || col < 0 { | ||
| return -1 | ||
| } | ||
| index := getSourceIndex(Handle(idx.handle)) | ||
| if index == nil { | ||
| return -1 | ||
| } | ||
| off, err := index.Offset(int(line), int(col)) | ||
| if err != nil { | ||
| // TODO: we should return this error somehow | ||
| // previously we stored it in Context, but we don't have (nor need) it here | ||
| return -1 | ||
| } | ||
| return C.int(off) | ||
| } | ||
|
|
||
| //export UastSourceIndexToLineCol | ||
| // UastSourceIndexToLineCol converts zero-based byte offset in the indexed source | ||
| // file to a one-based line and one-based column pair (in bytes). | ||
| // It return a UastLineCol with both elements set to -1 in case of failure. | ||
| func UastSourceIndexToLineCol(idx *C.UastSourceIndex, off C.int) C.UastLineCol { | ||
| return convertToLineCol((*positioner.Index).LineCol, idx, off) | ||
| } | ||
|
|
||
| //export UastSourceIndexFromUnicode | ||
| // UastSourceIndexFromUnicode converts zero-based Unicode character offset in the indexed | ||
| // source file to a zero-based byte offset. It return -1 in case of failure. | ||
| func UastSourceIndexFromUnicode(idx *C.UastSourceIndex, off C.int) C.int { | ||
| return convertOffset((*positioner.Index).FromRuneOffset, idx, off) | ||
| } | ||
|
|
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| //export UastSourceIndexToUnicode | ||
| // UastSourceIndexToUnicode converts zero-based byte offset in the indexed source file to | ||
| // a zero-based Unicode character offset. It return -1 in case of failure. | ||
| func UastSourceIndexToUnicode(idx *C.UastSourceIndex, off C.int) C.int { | ||
| return convertOffset((*positioner.Index).ToRuneOffset, idx, off) | ||
| } | ||
|
|
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| //export UastSourceIndexFromUTF16 | ||
| // UastSourceIndexFromUTF16 converts zero-based UTF-16 code point offset in the indexed | ||
| // source file to a zero-based byte offset. It return -1 in case of failure. | ||
| func UastSourceIndexFromUTF16(idx *C.UastSourceIndex, off C.int) C.int { | ||
| return convertOffset((*positioner.Index).FromUTF16Offset, idx, off) | ||
| } | ||
|
|
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| //export UastSourceIndexToUTF16 | ||
| // UastSourceIndexToUTF16 converts zero-based byte offset in the indexed source file to | ||
| // a zero-based UTF-16 code point offset. It return -1 in case of failure. | ||
| func UastSourceIndexToUTF16(idx *C.UastSourceIndex, off C.int) C.int { | ||
| return convertOffset((*positioner.Index).ToUTF16Offset, idx, off) | ||
| } | ||
|
|
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| //export UastSourceIndexToUnicodeLineCol | ||
| // UastSourceIndexToUnicodeLineCol converts zero-based byte offset in the indexed source | ||
| // file to a one-based line and one-based column pair (in Unicode characters). | ||
| // It return a UastLineCol with both elements set to -1 in case of failure. | ||
| func UastSourceIndexToUnicodeLineCol(idx *C.UastSourceIndex, off C.int) C.UastLineCol { | ||
| return convertToLineCol((*positioner.Index).ToUnicodeLineCol, idx, off) | ||
| } | ||
|
|
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| //export UastSourceIndexToUTF16LineCol | ||
| // UastSourceIndexToUTF16LineCol converts zero-based byte offset in the indexed source | ||
| // file to a one-based line and one-based column pair (in UTF-16 code units). | ||
| // It return a UastLineCol with both elements set to -1 in case of failure. | ||
| func UastSourceIndexToUTF16LineCol(idx *C.UastSourceIndex, off C.int) C.UastLineCol { | ||
| return convertToLineCol((*positioner.Index).ToUTF16LineCol, idx, off) | ||
| } |
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