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JS: optimize JSON parser

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This commit is contained in:
Anton Bannykh
2019-04-12 13:00:19 +03:00
parent 675f930566
commit 56915d1c07
8 changed files with 52 additions and 35 deletions
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js/js.parser/src/org/jetbrains/kotlin/js/parser/sourcemaps/JSON.kt
+31 -22
View File
@@ -16,10 +16,7 @@
package org.jetbrains.kotlin.js.parser.sourcemaps
import java.io.Reader
import java.io.StringReader
import java.io.StringWriter
import java.io.Writer
import java.io.*
sealed class JsonNode {
abstract fun write(writer: Writer)
@@ -120,8 +117,7 @@ data class JsonNumber(val value: Double) : JsonNode() {
override fun write(writer: Writer) {
if (value.toLong().toDouble() == value) {
writer.append(value.toLong().toString())
}
else {
} else {
writer.append(value.toString())
}
}
@@ -130,14 +126,15 @@ data class JsonNumber(val value: Double) : JsonNode() {
}
class JsonSyntaxException(val offset: Int, val line: Int, val column: Int, val text: String) :
RuntimeException("JSON syntax error at ${line + 1}, ${column + 1}: $text")
RuntimeException("JSON syntax error at ${line + 1}, ${column + 1}: $text")
fun parseJson(reader: Reader): JsonNode = JsonParser(reader).parse()
fun parseJson(file: File): JsonNode = parseJson(file.readText(Charsets.UTF_8))
fun parseJson(text: String): JsonNode = parseJson(StringReader(text))
fun parseJson(text: String): JsonNode = JsonParser(text).parse()
private class JsonParser(val reader: Reader) {
private var charCode = reader.read()
private class JsonParser(val content: String) {
private var index = 0
private var charCode = content.getOrNull(index++)?.toInt() ?: -1
private var offset = 0
private var line = 0
private var col = 0
@@ -165,13 +162,27 @@ private class JsonParser(val reader: Reader) {
'['.toInt() -> parseArray()
'{'.toInt() -> parseObject()
'"'.toInt() -> JsonString(parseString())
'n'.toInt() -> { expectString("null"); JsonNull }
'f'.toInt() -> { expectString("false"); JsonBoolean.FALSE }
't'.toInt() -> { expectString("true"); JsonBoolean.TRUE }
in '0'.toInt()..'9'.toInt() -> JsonNumber(parseNumber())
'-'.toInt() -> { advance(); JsonNumber(-parseNumber())
'n'.toInt() -> {
expectString("null")
JsonNull
}
'f'.toInt() -> {
expectString("false")
JsonBoolean.FALSE
}
't'.toInt() -> {
expectString("true")
JsonBoolean.TRUE
}
'-'.toInt() -> {
advance()
JsonNumber(-parseNumber())
}
else -> if (charCode in '0'.toInt()..'9'.toInt()) {
JsonNumber(parseNumber())
} else {
error("Unexpected char")
}
else -> error("Unexpected char")
}
}
@@ -183,8 +194,7 @@ private class JsonParser(val reader: Reader) {
if (charCode == ']'.toInt()) {
advance()
break
}
else {
} else {
if (result.elements.isNotEmpty()) {
expectCharAndAdvance(',')
}
@@ -202,8 +212,7 @@ private class JsonParser(val reader: Reader) {
if (charCode == '}'.toInt()) {
advance()
break
}
else {
} else {
if (result.properties.isNotEmpty()) {
expectCharAndAdvance(',')
}
@@ -356,7 +365,7 @@ private class JsonParser(val reader: Reader) {
wasCR = false
}
}
charCode = reader.read()
charCode = content.getOrNull(index++)?.toInt() ?: -1
offset++
}
js/js.parser/src/org/jetbrains/kotlin/js/parser/sourcemaps/SourceMapParser.kt
+12 -3
View File
@@ -16,20 +16,29 @@
package org.jetbrains.kotlin.js.parser.sourcemaps
import java.io.File
import java.io.IOException
import java.io.Reader
import java.io.StringReader
object SourceMapParser {
@Throws(IOException::class)
fun parse(reader: Reader): SourceMapParseResult {
fun parse(file: File): SourceMapParseResult {
return parse(file.readText(Charsets.UTF_8))
}
@Throws(IOException::class)
fun parse(content: String): SourceMapParseResult {
val jsonObject = try {
parseJson(reader)
parseJson(content)
}
catch (e: JsonSyntaxException) {
return SourceMapError(e.message ?: "parse error")
}
return parse(jsonObject)
}
@Throws(IOException::class)
private fun parse(jsonObject: JsonNode): SourceMapParseResult {
if (jsonObject !is JsonObject) return SourceMapError("Top-level object expected")
val version = jsonObject.properties["version"] ?: return SourceMapError("Version not defined")