public final class TokenArray
extends java.lang.Object
Modifier and Type | Field and Description |
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int |
tokenCount
The number of tokens.
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int[] |
tokenEnds
The (dense) array of token end offsets.
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int[] |
tokenStarts
The (dense) array of token start offsets.
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short[] |
tokenValues
The (dense) array of token values.
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Constructor and Description |
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TokenArray(FastLexer lexer) |
Modifier and Type | Method and Description |
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void |
adjust(int offset)
Adjusts every offset in the token array by the given parameter.
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int |
findTokenIndexAtOffset(int offset)
Get the index of the token that encloses an offset.
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int |
offset2index(int query, boolean biasAfter)
Translates a TextBuffer offset into a TokenArray index with the given bias.
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public final int tokenCount
public final short[] tokenValues
public final int[] tokenStarts
public final int[] tokenEnds
public TokenArray(FastLexer lexer)
public void adjust(int offset)
public int findTokenIndexAtOffset(int offset)
offset
- The offset to be searched for.public int offset2index(int query, boolean biasAfter)
Assumes that all tokens are non-empty (except for the special EOF token). If there are empty tokens (besides the special EOF token), then no guarantee is made regarding the return value.
query
- The offset to be searched for.biasAfter
- True means use an after-bias. Otherwise, use a before-bias. After-bias means choose the next token. Before-bias means choose the previous.Note that whereas EOF is a proper token (the index of EOF is tokenCount-1), start-of-file is not. So, for clarity, if the offset is 0 and the first token is at 0, then 0 is returned, regardless of bias.
If the query is in whitespace, then supposing the query lies between tokens i-1 and i, this will return -(i+1). (This matches the behavior of the Arrays.binarySearch() methods).
To do the math for you, that means that: If the query is before the first token (assuming the first token is not at start-of-file), -1 is returned. If the query is between the last non-EOF token and EOF itself (that is, the file's trailing whitespace), then -tokenCount is returned.