Remove custom appengine and js builds

This commit allows for gjson and sjson to be supported in
WebAssembly `wasm` projects, but breaks compatibility for
anyone using gjson with older Google App Engine and GopherJS.

gjson.go

@@ -3,11 +3,13 @@ package gjson
 
 import (
 	"encoding/json"
+	"reflect"
 	"strconv"
 	"strings"
 	"time"
 	"unicode/utf16"
 	"unicode/utf8"
+	"unsafe"
 
 	"github.com/tidwall/match"
 	"github.com/tidwall/pretty"
@@ -2822,3 +2824,75 @@ func modValid(json, arg string) string {
 	}
 	return json
 }
+
+// getBytes casts the input json bytes to a string and safely returns the
+// results as uniquely allocated data. This operation is intended to minimize
+// copies and allocations for the large json string->[]byte.
+func getBytes(json []byte, path string) Result {
+	var result Result
+	if json != nil {
+		// unsafe cast to string
+		result = Get(*(*string)(unsafe.Pointer(&json)), path)
+		// safely get the string headers
+		rawhi := *(*reflect.StringHeader)(unsafe.Pointer(&result.Raw))
+		strhi := *(*reflect.StringHeader)(unsafe.Pointer(&result.Str))
+		// create byte slice headers
+		rawh := reflect.SliceHeader{Data: rawhi.Data, Len: rawhi.Len}
+		strh := reflect.SliceHeader{Data: strhi.Data, Len: strhi.Len}
+		if strh.Data == 0 {
+			// str is nil
+			if rawh.Data == 0 {
+				// raw is nil
+				result.Raw = ""
+			} else {
+				// raw has data, safely copy the slice header to a string
+				result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
+			}
+			result.Str = ""
+		} else if rawh.Data == 0 {
+			// raw is nil
+			result.Raw = ""
+			// str has data, safely copy the slice header to a string
+			result.Str = string(*(*[]byte)(unsafe.Pointer(&strh)))
+		} else if strh.Data >= rawh.Data &&
+			int(strh.Data)+strh.Len <= int(rawh.Data)+rawh.Len {
+			// Str is a substring of Raw.
+			start := int(strh.Data - rawh.Data)
+			// safely copy the raw slice header
+			result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
+			// substring the raw
+			result.Str = result.Raw[start : start+strh.Len]
+		} else {
+			// safely copy both the raw and str slice headers to strings
+			result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
+			result.Str = string(*(*[]byte)(unsafe.Pointer(&strh)))
+		}
+	}
+	return result
+}
+
+// fillIndex finds the position of Raw data and assigns it to the Index field
+// of the resulting value. If the position cannot be found then Index zero is
+// used instead.
+func fillIndex(json string, c *parseContext) {
+	if len(c.value.Raw) > 0 && !c.calcd {
+		jhdr := *(*reflect.StringHeader)(unsafe.Pointer(&json))
+		rhdr := *(*reflect.StringHeader)(unsafe.Pointer(&(c.value.Raw)))
+		c.value.Index = int(rhdr.Data - jhdr.Data)
+		if c.value.Index < 0 || c.value.Index >= len(json) {
+			c.value.Index = 0
+		}
+	}
+}
+
+func stringBytes(s string) []byte {
+	return *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{
+		Data: (*reflect.StringHeader)(unsafe.Pointer(&s)).Data,
+		Len:  len(s),
+		Cap:  len(s),
+	}))
+}
+
+func bytesString(b []byte) string {
+	return *(*string)(unsafe.Pointer(&b))
+}

gjson_gae.go

@@ -1,18 +0,0 @@
-//+build appengine js
-
-package gjson
-
-func getBytes(json []byte, path string) Result {
-	return Get(string(json), path)
-}
-func fillIndex(json string, c *parseContext) {
-	// noop. Use zero for the Index value.
-}
-
-func stringBytes(s string) []byte {
-	return []byte(s)
-}
-
-func bytesString(b []byte) string {
-	return string(b)
-}

gjson_ngae.go

@@ -1,81 +0,0 @@
-//+build !appengine
-//+build !js
-
-package gjson
-
-import (
-	"reflect"
-	"unsafe"
-)
-
-// getBytes casts the input json bytes to a string and safely returns the
-// results as uniquely allocated data. This operation is intended to minimize
-// copies and allocations for the large json string->[]byte.
-func getBytes(json []byte, path string) Result {
-	var result Result
-	if json != nil {
-		// unsafe cast to string
-		result = Get(*(*string)(unsafe.Pointer(&json)), path)
-		// safely get the string headers
-		rawhi := *(*reflect.StringHeader)(unsafe.Pointer(&result.Raw))
-		strhi := *(*reflect.StringHeader)(unsafe.Pointer(&result.Str))
-		// create byte slice headers
-		rawh := reflect.SliceHeader{Data: rawhi.Data, Len: rawhi.Len}
-		strh := reflect.SliceHeader{Data: strhi.Data, Len: strhi.Len}
-		if strh.Data == 0 {
-			// str is nil
-			if rawh.Data == 0 {
-				// raw is nil
-				result.Raw = ""
-			} else {
-				// raw has data, safely copy the slice header to a string
-				result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
-			}
-			result.Str = ""
-		} else if rawh.Data == 0 {
-			// raw is nil
-			result.Raw = ""
-			// str has data, safely copy the slice header to a string
-			result.Str = string(*(*[]byte)(unsafe.Pointer(&strh)))
-		} else if strh.Data >= rawh.Data &&
-			int(strh.Data)+strh.Len <= int(rawh.Data)+rawh.Len {
-			// Str is a substring of Raw.
-			start := int(strh.Data - rawh.Data)
-			// safely copy the raw slice header
-			result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
-			// substring the raw
-			result.Str = result.Raw[start : start+strh.Len]
-		} else {
-			// safely copy both the raw and str slice headers to strings
-			result.Raw = string(*(*[]byte)(unsafe.Pointer(&rawh)))
-			result.Str = string(*(*[]byte)(unsafe.Pointer(&strh)))
-		}
-	}
-	return result
-}
-
-// fillIndex finds the position of Raw data and assigns it to the Index field
-// of the resulting value. If the position cannot be found then Index zero is
-// used instead.
-func fillIndex(json string, c *parseContext) {
-	if len(c.value.Raw) > 0 && !c.calcd {
-		jhdr := *(*reflect.StringHeader)(unsafe.Pointer(&json))
-		rhdr := *(*reflect.StringHeader)(unsafe.Pointer(&(c.value.Raw)))
-		c.value.Index = int(rhdr.Data - jhdr.Data)
-		if c.value.Index < 0 || c.value.Index >= len(json) {
-			c.value.Index = 0
-		}
-	}
-}
-
-func stringBytes(s string) []byte {
-	return *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{
-		Data: (*reflect.StringHeader)(unsafe.Pointer(&s)).Data,
-		Len:  len(s),
-		Cap:  len(s),
-	}))
-}
-
-func bytesString(b []byte) string {
-	return *(*string)(unsafe.Pointer(&b))
-}