mirror of https://github.com/mikefarah/yq.git
374 lines
15 KiB
Go
374 lines
15 KiB
Go
// Use the top level Evaluator or StreamEvaluator to evaluate expressions and return matches.
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//
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package yqlib
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import (
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"bytes"
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"container/list"
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"fmt"
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"strconv"
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"strings"
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logging "gopkg.in/op/go-logging.v1"
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yaml "gopkg.in/yaml.v3"
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)
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var ExpressionParser ExpressionParserInterface
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func InitExpressionParser() {
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if ExpressionParser == nil {
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ExpressionParser = newExpressionParser()
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}
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}
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type xmlPreferences struct {
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AttributePrefix string
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ContentName string
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}
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var log = logging.MustGetLogger("yq-lib")
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var PrettyPrintExp = `(... | (select(tag != "!!str"), select(tag == "!!str") | select(test("(?i)^(y|yes|n|no|on|off)$") | not)) ) style=""`
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// GetLogger returns the yq logger instance.
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func GetLogger() *logging.Logger {
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return log
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}
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type operationType struct {
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Type string
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NumArgs uint // number of arguments to the op
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Precedence uint
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Handler operatorHandler
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}
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var orOpType = &operationType{Type: "OR", NumArgs: 2, Precedence: 20, Handler: orOperator}
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var andOpType = &operationType{Type: "AND", NumArgs: 2, Precedence: 20, Handler: andOperator}
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var reduceOpType = &operationType{Type: "REDUCE", NumArgs: 2, Precedence: 35, Handler: reduceOperator}
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var blockOpType = &operationType{Type: "BLOCK", Precedence: 10, NumArgs: 2, Handler: emptyOperator}
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var unionOpType = &operationType{Type: "UNION", NumArgs: 2, Precedence: 10, Handler: unionOperator}
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var pipeOpType = &operationType{Type: "PIPE", NumArgs: 2, Precedence: 30, Handler: pipeOperator}
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var assignOpType = &operationType{Type: "ASSIGN", NumArgs: 2, Precedence: 40, Handler: assignUpdateOperator}
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var addAssignOpType = &operationType{Type: "ADD_ASSIGN", NumArgs: 2, Precedence: 40, Handler: addAssignOperator}
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var subtractAssignOpType = &operationType{Type: "SUBTRACT_ASSIGN", NumArgs: 2, Precedence: 40, Handler: subtractAssignOperator}
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var assignAttributesOpType = &operationType{Type: "ASSIGN_ATTRIBUTES", NumArgs: 2, Precedence: 40, Handler: assignAttributesOperator}
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var assignStyleOpType = &operationType{Type: "ASSIGN_STYLE", NumArgs: 2, Precedence: 40, Handler: assignStyleOperator}
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var assignVariableOpType = &operationType{Type: "ASSIGN_VARIABLE", NumArgs: 2, Precedence: 40, Handler: assignVariableOperator}
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var assignTagOpType = &operationType{Type: "ASSIGN_TAG", NumArgs: 2, Precedence: 40, Handler: assignTagOperator}
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var assignCommentOpType = &operationType{Type: "ASSIGN_COMMENT", NumArgs: 2, Precedence: 40, Handler: assignCommentsOperator}
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var assignAnchorOpType = &operationType{Type: "ASSIGN_ANCHOR", NumArgs: 2, Precedence: 40, Handler: assignAnchorOperator}
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var assignAliasOpType = &operationType{Type: "ASSIGN_ALIAS", NumArgs: 2, Precedence: 40, Handler: assignAliasOperator}
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var multiplyOpType = &operationType{Type: "MULTIPLY", NumArgs: 2, Precedence: 42, Handler: multiplyOperator}
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var multiplyAssignOpType = &operationType{Type: "MULTIPLY_ASSIGN", NumArgs: 2, Precedence: 42, Handler: multiplyAssignOperator}
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var addOpType = &operationType{Type: "ADD", NumArgs: 2, Precedence: 42, Handler: addOperator}
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var subtractOpType = &operationType{Type: "SUBTRACT", NumArgs: 2, Precedence: 42, Handler: subtractOperator}
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var alternativeOpType = &operationType{Type: "ALTERNATIVE", NumArgs: 2, Precedence: 42, Handler: alternativeOperator}
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var equalsOpType = &operationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: equalsOperator}
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var notEqualsOpType = &operationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: notEqualsOperator}
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//createmap needs to be above union, as we use union to build the components of the objects
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var createMapOpType = &operationType{Type: "CREATE_MAP", NumArgs: 2, Precedence: 15, Handler: createMapOperator}
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var shortPipeOpType = &operationType{Type: "SHORT_PIPE", NumArgs: 2, Precedence: 45, Handler: pipeOperator}
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var lengthOpType = &operationType{Type: "LENGTH", NumArgs: 0, Precedence: 50, Handler: lengthOperator}
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var collectOpType = &operationType{Type: "COLLECT", NumArgs: 1, Precedence: 50, Handler: collectOperator}
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var mapOpType = &operationType{Type: "MAP", NumArgs: 1, Precedence: 50, Handler: mapOperator}
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var evalOpType = &operationType{Type: "EVAL", NumArgs: 1, Precedence: 50, Handler: evalOperator}
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var mapValuesOpType = &operationType{Type: "MAP_VALUES", NumArgs: 1, Precedence: 50, Handler: mapValuesOperator}
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var encodeOpType = &operationType{Type: "ENCODE", NumArgs: 0, Precedence: 50, Handler: encodeOperator}
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var decodeOpType = &operationType{Type: "DECODE", NumArgs: 0, Precedence: 50, Handler: decodeOperator}
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var anyOpType = &operationType{Type: "ANY", NumArgs: 0, Precedence: 50, Handler: anyOperator}
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var allOpType = &operationType{Type: "ALL", NumArgs: 0, Precedence: 50, Handler: allOperator}
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var containsOpType = &operationType{Type: "CONTAINS", NumArgs: 1, Precedence: 50, Handler: containsOperator}
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var anyConditionOpType = &operationType{Type: "ANY_CONDITION", NumArgs: 1, Precedence: 50, Handler: anyOperator}
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var allConditionOpType = &operationType{Type: "ALL_CONDITION", NumArgs: 1, Precedence: 50, Handler: allOperator}
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var toEntriesOpType = &operationType{Type: "TO_ENTRIES", NumArgs: 0, Precedence: 50, Handler: toEntriesOperator}
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var fromEntriesOpType = &operationType{Type: "FROM_ENTRIES", NumArgs: 0, Precedence: 50, Handler: fromEntriesOperator}
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var withEntriesOpType = &operationType{Type: "WITH_ENTRIES", NumArgs: 1, Precedence: 50, Handler: withEntriesOperator}
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var withOpType = &operationType{Type: "WITH", NumArgs: 1, Precedence: 50, Handler: withOperator}
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var splitDocumentOpType = &operationType{Type: "SPLIT_DOC", NumArgs: 0, Precedence: 50, Handler: splitDocumentOperator}
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var getVariableOpType = &operationType{Type: "GET_VARIABLE", NumArgs: 0, Precedence: 55, Handler: getVariableOperator}
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var getStyleOpType = &operationType{Type: "GET_STYLE", NumArgs: 0, Precedence: 50, Handler: getStyleOperator}
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var getTagOpType = &operationType{Type: "GET_TAG", NumArgs: 0, Precedence: 50, Handler: getTagOperator}
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var getKeyOpType = &operationType{Type: "GET_KEY", NumArgs: 0, Precedence: 50, Handler: getKeyOperator}
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var getParentOpType = &operationType{Type: "GET_PARENT", NumArgs: 0, Precedence: 50, Handler: getParentOperator}
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var getCommentOpType = &operationType{Type: "GET_COMMENT", NumArgs: 0, Precedence: 50, Handler: getCommentsOperator}
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var getAnchorOpType = &operationType{Type: "GET_ANCHOR", NumArgs: 0, Precedence: 50, Handler: getAnchorOperator}
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var getAliasOptype = &operationType{Type: "GET_ALIAS", NumArgs: 0, Precedence: 50, Handler: getAliasOperator}
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var getDocumentIndexOpType = &operationType{Type: "GET_DOCUMENT_INDEX", NumArgs: 0, Precedence: 50, Handler: getDocumentIndexOperator}
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var getFilenameOpType = &operationType{Type: "GET_FILENAME", NumArgs: 0, Precedence: 50, Handler: getFilenameOperator}
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var getFileIndexOpType = &operationType{Type: "GET_FILE_INDEX", NumArgs: 0, Precedence: 50, Handler: getFileIndexOperator}
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var getPathOpType = &operationType{Type: "GET_PATH", NumArgs: 0, Precedence: 50, Handler: getPathOperator}
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var explodeOpType = &operationType{Type: "EXPLODE", NumArgs: 1, Precedence: 50, Handler: explodeOperator}
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var sortByOpType = &operationType{Type: "SORT_BY", NumArgs: 1, Precedence: 50, Handler: sortByOperator}
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var sortOpType = &operationType{Type: "SORT", NumArgs: 0, Precedence: 50, Handler: sortOperator}
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var sortKeysOpType = &operationType{Type: "SORT_KEYS", NumArgs: 1, Precedence: 50, Handler: sortKeysOperator}
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var joinStringOpType = &operationType{Type: "JOIN", NumArgs: 1, Precedence: 50, Handler: joinStringOperator}
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var subStringOpType = &operationType{Type: "SUBSTR", NumArgs: 1, Precedence: 50, Handler: substituteStringOperator}
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var matchOpType = &operationType{Type: "MATCH", NumArgs: 1, Precedence: 50, Handler: matchOperator}
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var captureOpType = &operationType{Type: "CAPTURE", NumArgs: 1, Precedence: 50, Handler: captureOperator}
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var testOpType = &operationType{Type: "TEST", NumArgs: 1, Precedence: 50, Handler: testOperator}
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var splitStringOpType = &operationType{Type: "SPLIT", NumArgs: 1, Precedence: 50, Handler: splitStringOperator}
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var loadOpType = &operationType{Type: "LOAD", NumArgs: 1, Precedence: 50, Handler: loadYamlOperator}
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var keysOpType = &operationType{Type: "KEYS", NumArgs: 0, Precedence: 50, Handler: keysOperator}
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var collectObjectOpType = &operationType{Type: "COLLECT_OBJECT", NumArgs: 0, Precedence: 50, Handler: collectObjectOperator}
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var traversePathOpType = &operationType{Type: "TRAVERSE_PATH", NumArgs: 0, Precedence: 55, Handler: traversePathOperator}
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var traverseArrayOpType = &operationType{Type: "TRAVERSE_ARRAY", NumArgs: 2, Precedence: 50, Handler: traverseArrayOperator}
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var selfReferenceOpType = &operationType{Type: "SELF", NumArgs: 0, Precedence: 55, Handler: selfOperator}
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var valueOpType = &operationType{Type: "VALUE", NumArgs: 0, Precedence: 50, Handler: valueOperator}
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var envOpType = &operationType{Type: "ENV", NumArgs: 0, Precedence: 50, Handler: envOperator}
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var notOpType = &operationType{Type: "NOT", NumArgs: 0, Precedence: 50, Handler: notOperator}
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var emptyOpType = &operationType{Type: "EMPTY", Precedence: 50, Handler: emptyOperator}
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var envsubstOpType = &operationType{Type: "ENVSUBST", NumArgs: 0, Precedence: 50, Handler: envsubstOperator}
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var recursiveDescentOpType = &operationType{Type: "RECURSIVE_DESCENT", NumArgs: 0, Precedence: 50, Handler: recursiveDescentOperator}
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var selectOpType = &operationType{Type: "SELECT", NumArgs: 1, Precedence: 50, Handler: selectOperator}
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var hasOpType = &operationType{Type: "HAS", NumArgs: 1, Precedence: 50, Handler: hasOperator}
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var uniqueOpType = &operationType{Type: "UNIQUE", NumArgs: 0, Precedence: 50, Handler: unique}
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var uniqueByOpType = &operationType{Type: "UNIQUE_BY", NumArgs: 1, Precedence: 50, Handler: uniqueBy}
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var groupByOpType = &operationType{Type: "GROUP_BY", NumArgs: 1, Precedence: 50, Handler: groupBy}
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var flattenOpType = &operationType{Type: "FLATTEN_BY", NumArgs: 0, Precedence: 50, Handler: flattenOp}
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var deleteChildOpType = &operationType{Type: "DELETE", NumArgs: 1, Precedence: 40, Handler: deleteChildOperator}
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type Operation struct {
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OperationType *operationType
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Value interface{}
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StringValue string
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CandidateNode *CandidateNode // used for Value Path elements
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Preferences interface{}
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UpdateAssign bool // used for assign ops, when true it means we evaluate the rhs given the lhs
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}
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func recurseNodeArrayEqual(lhs *yaml.Node, rhs *yaml.Node) bool {
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if len(lhs.Content) != len(rhs.Content) {
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return false
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}
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for index := 0; index < len(lhs.Content); index = index + 1 {
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if !recursiveNodeEqual(lhs.Content[index], rhs.Content[index]) {
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return false
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}
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}
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return true
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}
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func findInArray(array *yaml.Node, item *yaml.Node) int {
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for index := 0; index < len(array.Content); index = index + 1 {
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if recursiveNodeEqual(array.Content[index], item) {
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return index
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}
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}
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return -1
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}
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func recurseNodeObjectEqual(lhs *yaml.Node, rhs *yaml.Node) bool {
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if len(lhs.Content) != len(rhs.Content) {
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return false
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}
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for index := 0; index < len(lhs.Content); index = index + 2 {
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key := lhs.Content[index]
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value := lhs.Content[index+1]
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indexInRHS := findInArray(rhs, key)
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if indexInRHS == -1 || !recursiveNodeEqual(value, rhs.Content[indexInRHS+1]) {
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return false
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}
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}
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return true
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}
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func recursiveNodeEqual(lhs *yaml.Node, rhs *yaml.Node) bool {
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if lhs.Kind != rhs.Kind {
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return false
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}
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if lhs.Kind == yaml.ScalarNode {
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//process custom tags of scalar nodes.
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//dont worry about matching tags of maps or arrays.
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lhsTag := lhs.Tag
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rhsTag := rhs.Tag
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if !strings.HasPrefix(lhsTag, "!!") {
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// custom tag - we have to have a guess
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lhsTag = guessTagFromCustomType(lhs)
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}
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if !strings.HasPrefix(rhsTag, "!!") {
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// custom tag - we have to have a guess
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rhsTag = guessTagFromCustomType(rhs)
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}
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if lhsTag != rhsTag {
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return false
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}
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}
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if lhs.Tag == "!!null" {
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return true
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} else if lhs.Kind == yaml.ScalarNode {
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return lhs.Value == rhs.Value
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} else if lhs.Kind == yaml.SequenceNode {
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return recurseNodeArrayEqual(lhs, rhs)
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} else if lhs.Kind == yaml.MappingNode {
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return recurseNodeObjectEqual(lhs, rhs)
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}
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return false
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}
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// yaml numbers can be hex encoded...
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func parseInt(numberString string) (string, int64, error) {
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if strings.HasPrefix(numberString, "0x") ||
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strings.HasPrefix(numberString, "0X") {
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num, err := strconv.ParseInt(numberString[2:], 16, 64)
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return "0x%X", num, err
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}
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num, err := strconv.ParseInt(numberString, 10, 64)
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return "%v", num, err
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}
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func createScalarNode(value interface{}, stringValue string) *yaml.Node {
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var node = &yaml.Node{Kind: yaml.ScalarNode}
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node.Value = stringValue
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switch value.(type) {
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case float32, float64:
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node.Tag = "!!float"
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case int, int64, int32:
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node.Tag = "!!int"
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case bool:
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node.Tag = "!!bool"
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case string:
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node.Tag = "!!str"
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case nil:
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node.Tag = "!!null"
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}
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return node
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}
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func headAndLineComment(node *yaml.Node) string {
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return headComment(node) + lineComment(node)
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}
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func headComment(node *yaml.Node) string {
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return strings.Replace(node.HeadComment, "#", "", 1)
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}
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func lineComment(node *yaml.Node) string {
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return strings.Replace(node.LineComment, "#", "", 1)
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}
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func footComment(node *yaml.Node) string {
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return strings.Replace(node.FootComment, "#", "", 1)
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}
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func createValueOperation(value interface{}, stringValue string) *Operation {
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var node = createScalarNode(value, stringValue)
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return &Operation{
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OperationType: valueOpType,
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Value: value,
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StringValue: stringValue,
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CandidateNode: &CandidateNode{Node: node},
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}
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}
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// debugging purposes only
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func (p *Operation) toString() string {
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if p == nil {
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return "OP IS NIL"
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}
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if p.OperationType == traversePathOpType {
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return fmt.Sprintf("%v", p.Value)
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} else if p.OperationType == selfReferenceOpType {
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return "SELF"
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} else if p.OperationType == valueOpType {
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return fmt.Sprintf("%v (%T)", p.Value, p.Value)
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} else {
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return fmt.Sprintf("%v", p.OperationType.Type)
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}
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}
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//use for debugging only
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func NodesToString(collection *list.List) string {
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if !log.IsEnabledFor(logging.DEBUG) {
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return ""
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}
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result := fmt.Sprintf("%v results\n", collection.Len())
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for el := collection.Front(); el != nil; el = el.Next() {
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result = result + "\n" + NodeToString(el.Value.(*CandidateNode))
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}
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return result
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}
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func NodeToString(node *CandidateNode) string {
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if !log.IsEnabledFor(logging.DEBUG) {
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return ""
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}
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value := node.Node
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if value == nil {
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return "-- nil --"
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}
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buf := new(bytes.Buffer)
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encoder := yaml.NewEncoder(buf)
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errorEncoding := encoder.Encode(value)
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if errorEncoding != nil {
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log.Error("Error debugging node, %v", errorEncoding.Error())
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}
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errorClosingEncoder := encoder.Close()
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if errorClosingEncoder != nil {
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log.Error("Error closing encoder: ", errorClosingEncoder.Error())
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}
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tag := value.Tag
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if value.Kind == yaml.DocumentNode {
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tag = "doc"
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} else if value.Kind == yaml.AliasNode {
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tag = "alias"
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}
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return fmt.Sprintf(`D%v, P%v, (%v)::%v`, node.Document, node.Path, tag, buf.String())
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}
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func KindString(kind yaml.Kind) string {
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switch kind {
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case yaml.ScalarNode:
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return "ScalarNode"
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case yaml.SequenceNode:
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return "SequenceNode"
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case yaml.MappingNode:
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return "MappingNode"
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case yaml.DocumentNode:
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return "DocumentNode"
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case yaml.AliasNode:
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return "AliasNode"
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default:
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return "unknown!"
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}
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}
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