Merge pull request #20 from fpatron/zero-allocation-mode

add initial pass with zero allocation

Author: fpatron

README.md

@@ -1,8 +1,9 @@
-# jsonc - https://pkg.go.dev/github.com/fpatron/jsonc
+# jsonc
 
 [![Go CI](https://github.com/fpatron/jsonc/actions/workflows/go.yml/badge.svg)](https://github.com/fpatron/jsonc/actions/workflows/go.yml)
+[![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg)](http://godoc.org/github.com/fpatron/jsonc)
 
-`jsonc` is an extension of the JSON data format that allows single and multi line comments and provides accurate parsing errors.
+`jsonc` is an extension of the JSON data format that allows single and multi line comments.
 
 ## Instalation
 To install `jsonc`, use `go get`:   
@@ -13,7 +14,6 @@ To install `jsonc`, use `go get`:
 ## Features
 
 - **Comment Support**: Easily parse JSON files with single-line and multi-line comments.
-- **Accurate Errors**: Errors while parsing will match original commented JSON.
 - **Simple API**: Uses a familiar API similar to the standard `encoding/json` package.
 
 ## Usage

jsonc.go

@@ -18,6 +18,32 @@ func stripComments(data []byte) []byte {
 	)
 
 	state := OUTSIDE
+	hasComment := false
+scanLoop:
+	for i := 0; i < len(data); i++ {
+		switch state {
+		case OUTSIDE:
+			if data[i] == '/' && i+1 < len(data) && (data[i+1] == '/' || data[i+1] == '*') {
+				hasComment = true
+				break scanLoop
+			}
+			if data[i] == '"' {
+				state = IN_STRING
+			}
+		case IN_STRING:
+			if data[i] == '\\' && i+1 < len(data) {
+				i++
+			} else if data[i] == '"' {
+				state = OUTSIDE
+			}
+		}
+	}
+
+	if !hasComment {
+		return data
+	}
+
+	state = OUTSIDE
 	result := make([]byte, 0, len(data))
 
 	for i := 0; i < len(data); i++ {

v2/jsonc.go

@@ -16,6 +16,32 @@ func stripComments(data []byte) []byte {
 	)
 
 	state := OUTSIDE
+	hasComment := false
+scanLoop:
+	for i := 0; i < len(data); i++ {
+		switch state {
+		case OUTSIDE:
+			if data[i] == '/' && i+1 < len(data) && (data[i+1] == '/' || data[i+1] == '*') {
+				hasComment = true
+				break scanLoop
+			}
+			if data[i] == '"' {
+				state = IN_STRING
+			}
+		case IN_STRING:
+			if data[i] == '\\' && i+1 < len(data) {
+				i++
+			} else if data[i] == '"' {
+				state = OUTSIDE
+			}
+		}
+	}
+
+	if !hasComment {
+		return data
+	}
+
+	state = OUTSIDE
 	result := make([]byte, 0, len(data))
 
 	for i := 0; i < len(data); i++ {