parse

package
v0.2.0 Latest Latest
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 Go to latest Published: Aug 14, 2024 License: Apache-2.0 Imports: 10 Imported by: 1

README

Grammar


rule ::= atom '.'
       | atom  ':-' rhs

rhs ::= litOrFml (',' litOrFml)* '.'
      | litOrFml (',' litOrFml)* '|>' transforms

transforms ::= stmts '.'
             | 'do' apply-expr ',' stmts '.'

stmts ::= stmt (',' stmt)*
stmt ::= 'let' var '=' expr

litOrFml ::= atom | '!' atom | cmp

atom ::= pred-ident '(' exprs? ')'

expr ::= apply-expr
       | constant
       | var

exprs ::= expr (',' expr)*

apply-expr ::= fn-ident '(' exprs? ')'
             | [ exprs? ]

cmp ::= expr op expr

op ::= '=' | '!=' | '<' | '>'

constant   ::= name, number or string constant
fn-ident   ::= ident (starting with 'fn:')
pred-ident ::= ident (not starting with 'fn:')

Documentation

Overview

Package parse provides methods to parse datalog programs and parts thereof.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Atom 

func Atom(s string) (ast.Atom, error)

Atom parses an Atom from given string.

func BaseTerm 

func BaseTerm(s string) (ast.BaseTerm, error)

BaseTerm parses a BaseTerm from given string.

func Clause 

func Clause(s string) (ast.Clause, error)

Clause parses a single clause.

func LiteralOrFormula 

func LiteralOrFormula(s string) (ast.Term, error)

LiteralOrFormula parses a single Term, an equality or inequality from a given string.

func PredicateName 

func PredicateName(s string) (string, error)

PredicateName parses a predicate name.

func Term 

func Term(s string) (ast.Term, error)

Term parses a Term from given string.

Types

type Error 

type Error struct {
	Message string
	Line    int // 1-based line number within source.
	Column  int // 0-based line number within source.
}

Error represents a parser error messages, without location.

type Parser 

type Parser struct {
	gen.BaseMangleVisitor
	// contains filtered or unexported fields
}

Parser represents an object that can be used for parsing.

func (*Parser) ReportAmbiguity 

func (p *Parser) ReportAmbiguity(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex int, exact bool, ambigAlts *antlr.BitSet, configs *antlr.ATNConfigSet)

ReportAmbiguity implements error listener interface.

func (*Parser) ReportAttemptingFullContext 

func (p *Parser) ReportAttemptingFullContext(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex int, conflictingAlts *antlr.BitSet, configs *antlr.ATNConfigSet)

ReportAttemptingFullContext implements error listener interface.

func (*Parser) ReportContextSensitivity 

func (p *Parser) ReportContextSensitivity(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex, prediction int, configs *antlr.ATNConfigSet)

ReportContextSensitivity implements error listener interface.

func (*Parser) SyntaxError 

func (p *Parser) SyntaxError(recognizer antlr.Recognizer, offendingSymbol any, line, column int, msg string, e antlr.RecognitionException)

SyntaxError is called by ANTLR generated code when a syntax error is encountered.

func (*Parser) Visit 

func (p *Parser) Visit(tree antlr.ParseTree) any

Visit is the Visitor implementation.

func (Parser) VisitAppl 

func (p Parser) VisitAppl(ctx *gen.ApplContext) any

VisitAppl visits a parse tree produced by MangleParser#Appl.

func (Parser) VisitAtom 

func (p Parser) VisitAtom(ctx *gen.AtomContext) any

VisitAtom visits a parse tree produced by MangleParser#atoms.

func (Parser) VisitAtoms 

func (p Parser) VisitAtoms(ctx *gen.AtomsContext) any

VisitAtoms visits a parse tree produced by MangleParser#atoms.

func (Parser) VisitBStr added in v0.2.0 

func (p Parser) VisitBStr(ctx *gen.BStrContext) any

VisitBStr visits a parse tree produced by MangleParser#BStr.

func (Parser) VisitBoundsBlock 

func (p Parser) VisitBoundsBlock(ctx *gen.BoundsBlockContext) any

VisitBoundsBlock visits a parse tree produced by MangleParser#boundsBlock.

func (Parser) VisitClause 

func (p Parser) VisitClause(ctx *gen.ClauseContext) any

VisitClause visits a parse tree produced by MangleParser#clause.

func (Parser) VisitClauseBody 

func (p Parser) VisitClauseBody(ctx *gen.ClauseBodyContext) any

VisitClauseBody visits a parse tree produced by MangleParser#clauseBody.

func (Parser) VisitConst 

func (p Parser) VisitConst(ctx *gen.ConstContext) any

VisitConst visits a parse tree produced by MangleParser#Const.

func (Parser) VisitConstraintsBlock 

func (p Parser) VisitConstraintsBlock(ctx *gen.ConstraintsBlockContext) any

VisitConstraintsBlock visits a parse tree produced by MangleParser#constraintsBlock.

func (Parser) VisitDecl 

func (p Parser) VisitDecl(ctx *gen.DeclContext) any

VisitDecl visits a parse tree produced by MangleParser#decl.

func (Parser) VisitDescrBlock 

func (p Parser) VisitDescrBlock(ctx *gen.DescrBlockContext) any

VisitDescrBlock visits a parse tree produced by MangleParser#descrBlock.

func (Parser) VisitFloat 

func (p Parser) VisitFloat(ctx *gen.FloatContext) any

VisitFloat visits a parse tree produced by MangleParser#Float.

func (Parser) VisitLetStmt 

func (p Parser) VisitLetStmt(ctx *gen.LetStmtContext) any

VisitLetStmt visits a parse tree produced by MangleParser#letStmt.

func (Parser) VisitList 

func (p Parser) VisitList(ctx *gen.ListContext) any

VisitList visits a parse tree produced by MangleParser#List.

func (Parser) VisitLiteralOrFml 

func (p Parser) VisitLiteralOrFml(ctx *gen.LiteralOrFmlContext) any

VisitLiteralOrFml visits a parse tree produced by literalOrFml

func (Parser) VisitMap 

func (p Parser) VisitMap(ctx *gen.MapContext) any

VisitMap visits a parse tree produced by MangleParser#Map.

func (Parser) VisitNum 

func (p Parser) VisitNum(ctx *gen.NumContext) any

VisitNum visits a parse tree produced by MangleParser#Num.

func (Parser) VisitPackageDecl 

func (p Parser) VisitPackageDecl(ctx *gen.PackageDeclContext) any

VisitPackageDecl visits a parse tree produced by MangleParser#packageDecl.

func (Parser) VisitProgram 

func (p Parser) VisitProgram(ctx *gen.ProgramContext) any

VisitProgram visits a parse tree produced by MangleParser#program.

func (Parser) VisitStart 

func (p Parser) VisitStart(ctx *gen.StartContext) any

VisitStart visits a parse tree produced by MangleParser#start.

func (Parser) VisitStr 

func (p Parser) VisitStr(ctx *gen.StrContext) any

VisitStr visits a parse tree produced by MangleParser#Str.

func (Parser) VisitStruct 

func (p Parser) VisitStruct(ctx *gen.StructContext) any

VisitStruct visits a parse tree produced by MangleParser#Struct.

func (Parser) VisitTransform 

func (p Parser) VisitTransform(ctx *gen.TransformContext) any

VisitTransform visits a parse tree produced by MangleParser#transform.

func (Parser) VisitUseDecl 

func (p Parser) VisitUseDecl(ctx *gen.UseDeclContext) any

VisitUseDecl visits a parse tree produced by MangleParser#useDecl.

func (Parser) VisitVar 

func (p Parser) VisitVar(ctx *gen.VarContext) any

VisitVar visits a parse tree produced by MangleParser#Var.

type SourceUnit 

type SourceUnit struct {
	Decls   []ast.Decl
	Clauses []ast.Clause
}

SourceUnit consists of decls and clauses.

func Unit 

func Unit(reader io.Reader) (SourceUnit, error)

Unit parses a source unit (clauses and decls).

Source Files

View all Source files

Directories

Path Synopsis

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