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perf(compiler): further improve advanceBy perf

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This commit is contained in:
Evan You 2019-09-19 21:18:18 -04:00
parent 2b4f06b24c
commit 98571ab496
1 changed files with 11 additions and 5 deletions
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16
packages/compiler-core/src/utils.ts
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@ -36,15 +36,21 @@ export function advancePositionWithMutation(
): Position { ): Position {
__DEV__ && assert(numberOfCharacters <= source.length) __DEV__ && assert(numberOfCharacters <= source.length)
const str = source.slice(0, numberOfCharacters) let linesCount = 0
const lines = str.split(/\r?\n/) let lastNewLinePos = -1
for (let i = 0; i < numberOfCharacters; i++) {
if (source.charCodeAt(i) === 10 /* newline char code */) {
linesCount++
lastNewLinePos = i
}
}
pos.offset += numberOfCharacters pos.offset += numberOfCharacters
pos.line += lines.length - 1 pos.line += linesCount
pos.column = pos.column =
lines.length === 1 lastNewLinePos === -1
? pos.column + numberOfCharacters ? pos.column + numberOfCharacters
: Math.max(1, lines.pop()!.length) : Math.max(1, numberOfCharacters - lastNewLinePos - 1)
return pos return pos
} }