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Documentation
¶
Overview ¶
Package parser is used to parse an input program from its tokens and produce an abstract syntax tree (AST) as output.
A parser is created by calling New() with a lexer as input. The parser should then be used only once, by calling parser.Parse() to produce the AST.
Index ¶
- Constants
- func Parse(input string) (*ast.Program, error)
- func ParseWithOpts(ctx context.Context, opts Opts) (*ast.Program, error)
- type BaseParserError
- func (e *BaseParserError) Cause() error
- func (e *BaseParserError) EndPosition() token.Position
- func (e *BaseParserError) Error() string
- func (e *BaseParserError) File() string
- func (e *BaseParserError) FriendlyMessage() string
- func (e *BaseParserError) Line() int
- func (e *BaseParserError) Message() string
- func (e *BaseParserError) SourceCode() string
- func (e *BaseParserError) StartPosition() token.Position
- func (e *BaseParserError) Type() string
- func (e *BaseParserError) Unwrap() error
- type ErrorOpts
- type Opts
- type Parser
- type ParserError
- type SyntaxError
Constants ¶
const ( LOWEST int PIPE // | COND // OR or AND ASSIGN // = DECLARE // := TERNARY // ? : EQUALS // == or != LESSGREATER // > or < SUM // + or - PRODUCT // * or / POWER // ** MOD // % PREFIX // -X or !X CALL // myFunction(X) IN // X in Y RANGE // range X INDEX // array[index], map[key] HIGHEST )
Precedence order for operators
Variables ¶
This section is empty.
Functions ¶
Types ¶
type BaseParserError ¶
type BaseParserError struct {
// contains filtered or unexported fields
}
BaseParserError is the simplest implementation of ParserError.
func NewParserError ¶
func NewParserError(opts ErrorOpts) *BaseParserError
NewBaseParserError returns a new BaseParserError populated with the given error data.
func (*BaseParserError) Cause ¶
func (e *BaseParserError) Cause() error
func (*BaseParserError) EndPosition ¶
func (e *BaseParserError) EndPosition() token.Position
func (*BaseParserError) Error ¶
func (e *BaseParserError) Error() string
func (*BaseParserError) File ¶
func (e *BaseParserError) File() string
func (*BaseParserError) FriendlyMessage ¶
func (e *BaseParserError) FriendlyMessage() string
func (*BaseParserError) Line ¶
func (e *BaseParserError) Line() int
func (*BaseParserError) Message ¶
func (e *BaseParserError) Message() string
func (*BaseParserError) SourceCode ¶
func (e *BaseParserError) SourceCode() string
func (*BaseParserError) StartPosition ¶
func (e *BaseParserError) StartPosition() token.Position
func (*BaseParserError) Type ¶
func (e *BaseParserError) Type() string
func (*BaseParserError) Unwrap ¶
func (e *BaseParserError) Unwrap() error
type ErrorOpts ¶
type ErrorOpts struct {
ErrType string
Message string
Cause error
File string
StartPosition token.Position
EndPosition token.Position
SourceCode string
}
ErrorOpts is a struct that holds a variety of error data. All fields are optional, although one of `Cause` or `Message` are recommended. If `Cause` is set, `Message` will be ignored.
type Opts ¶
type Opts struct {
// Input is the string being parsed.
Input string
// File is the name of the file being parsed (optional).
File string
}
Opts contains options for the parser.
type Parser ¶
type Parser struct {
// contains filtered or unexported fields
}
Parser object
type ParserError ¶
type ParserError interface {
Type() string
Message() string
Cause() error
File() string
StartPosition() token.Position
EndPosition() token.Position
SourceCode() string
Error() string
FriendlyMessage() string
}
ParserError is an interface that all parser errors implement.
type SyntaxError ¶
type SyntaxError struct {
*BaseParserError
}
func NewSyntaxError ¶
func NewSyntaxError(opts ErrorOpts) *SyntaxError
NewSyntaxError returns a new SyntaxError populated with the given error data
Source Files