Documentation
¶
Overview ¶
Package parser implements a parser for JavaScript.
import (
"github.com/robertkrimen/otto/parser"
)
Parse and return an AST
filename := "" // A filename is optional
src := `
// Sample xyzzy example
(function(){
if (3.14159 > 0) {
console.log("Hello, World.");
return;
}
var xyzzy = NaN;
console.log("Nothing happens.");
return xyzzy;
})();
`
// Parse some JavaScript, yielding a *ast.Program and/or an ErrorList
program, err := parser.ParseFile(nil, filename, src, 0)
Warning ¶
The parser and AST interfaces are still works-in-progress (particularly where node types are concerned) and may change in the future.
Index ¶
- func ParseFile(fileSet *file.FileSet, filename string, src interface{}, mode Mode) (*ast.Program, error)
- func ParseFileWithSourceMap(fileSet *file.FileSet, filename string, ...) (*ast.Program, error)
- func ParseFunction(parameterList, body string) (*ast.FunctionLiteral, error)
- func ReadSource(filename string, src interface{}) ([]byte, error)
- func ReadSourceMap(filename string, src interface{}) (*sourcemap.Consumer, error)
- func TransformRegExp(pattern string) (string, error)
- type Error
- type ErrorList
- type Mode
- type Parser
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func ParseFile ¶
func ParseFile(fileSet *file.FileSet, filename string, src interface{}, mode Mode) (*ast.Program, error)
ParseFile parses the source code of a single JavaScript/ECMAScript source file and returns the corresponding ast.Program node.
If fileSet == nil, ParseFile parses source without a FileSet. If fileSet != nil, ParseFile first adds filename and src to fileSet.
The filename argument is optional and is used for labelling errors, etc.
src may be a string, a byte slice, a bytes.Buffer, or an io.Reader, but it MUST always be in UTF-8.
// Parse some JavaScript, yielding a *ast.Program and/or an ErrorList
program, err := parser.ParseFile(nil, "", `if (abc > 1) {}`, 0)
func ParseFileWithSourceMap ¶
func ParseFileWithSourceMap(fileSet *file.FileSet, filename string, javascriptSource, sourcemapSource interface{}, mode Mode) (*ast.Program, error)
ParseFileWithSourceMap parses the sourcemap returning the resulting Program.
func ParseFunction ¶
func ParseFunction(parameterList, body string) (*ast.FunctionLiteral, error)
ParseFunction parses a given parameter list and body as a function and returns the corresponding ast.FunctionLiteral node.
The parameter list, if any, should be a comma-separated list of identifiers.
func ReadSource ¶
ReadSource reads code from src if not nil, otherwise reads from filename.
func ReadSourceMap ¶
ReadSourceMap reads the source map from src if not nil, otherwise is a noop.
func TransformRegExp ¶
TransformRegExp transforms a JavaScript pattern into a Go "regexp" pattern.
re2 (Go) cannot do backtracking, so the presence of a lookahead (?=) (?!) or backreference (\1, \2, ...) will cause an error.
re2 (Go) has a different definition for \s: [\t\n\f\r ]. The JavaScript definition, on the other hand, also includes \v, Unicode "Separator, Space", etc.
If the pattern is invalid (not valid even in JavaScript), then this function returns the empty string and an error.
If the pattern is valid, but incompatible (contains a lookahead or backreference), then this function returns the transformation (a non-empty string) AND an error.
Types ¶
type Error ¶
An Error represents a parsing error. It includes the position where the error occurred and a message/description.
type ErrorList ¶
type ErrorList []*Error //nolint:errname
ErrorList is a list of *Errors.
Source Files