org.virtuslab.yaml.internal.load.parse

Valid sequence of events should obey following grammar stream ::= STREAM-START document* STREAM-END document ::= DOCUMENT-START node DOCUMENT-END node ::= ALIAS | SCALAR | sequence | mapping sequence ::= SEQUENCE-START node* SEQUENCE-END mapping ::= MAPPING-START (node node)* MAPPING-END

Carries additional information about event which represents YAML node (scalar, start of mapping or sequence). This could be:

• anchor
• tags (not yet supported)

Parser takes a stream of Tokens and produces a series of serialization Events. Parsing can fail due to ill-formed input.

ParserImpl is using following productions:

ParseStreamStart ::= (stream_start) ParseDocumentStart ParseDocumentStartOpt ParseStreamEnd ParseStreamEnd ::= (stream_end)

ParseDocumentStart ::= (document_start) ParseNode ParseDocumentEnd ParseDocumentEnd ::= (document_end) ParseDocumentStartOpt ::= epsilon | ParseDocumentStart ParseDocumentStartOpt

ParseNode(indentLess=false) ::= ParseMappingStart | ParseFlowMappingStart | ParseSequenceStart(indentLess) | ParseFlowSeqStart | ParseScalar ParseScalar ::= scalar

ParseMappingStart ::= mapping_start ParseMappingEntry ParseMappingEnd ParseMappingEnd ::= mapping_end ParseMappingEntry ::= mapping_key ParseScalar ParseMappingValue ParseMappingEntryOpt ParseMappingValue ::= mapping_value ParseNode(true) ParseMappingEntryOpt ::= epsilon | ParseMappingEntry

ParseSequenceStart(indentLess)::= (seq_start) ParseSequenceEntry ParseSequenceEnd(indentLess) ParseSequenceEnd(indentLess) ::= (seq_end) ParseSequenceEntry ::= seq_value ParseNode ParseSequenceEntryOpt ParseSequenceEntryOpt ::= epsilon | ParseSequenceEntry

ParseFlowNode ::= ParseFlowMappingStart | ParseFlowSeqStart | ParseScalar

ParseFlowMappingStart ::= flow_mapping_start ParseFlowMappingEntryOpt ParseFlowMappingEnd ParseFlowMappingEnd ::= flow_mapping_end ParseFlowMappingEntry ::= mapping_key ParseScalar ParseMappingValue ParseFlowMappingEntryOpt ::= epsilon | ParseFlowMappingEntry ParseFlowMappingComma ::= epsilon | comma ParseFlowMappingEntryOpt

ParseFlowSeqStart ::= flow_seq_start ParseFlowSeqEntryOpt ParseFlowSeqEnd ParseFlowSeqEnd ::= flow_seq_end ParseFlowSeqEntry ::= (ParseFlowNode | ParseFlowPairKey) ParseFlowSeqComma ParseFlowSeqEntryOpt ::= epsilon | ParseFlowSeqEntry ParseFlowSeqComma ::= epsilon | comma ParseFlowSeqEntryOpt

ParseFlowPairKey ::= mapping_key ParseFlowNode ParseFlowPairValue ParseFlowPairValue ::= mapping_value ParseFlowNode