199 lines
8.4 KiB
Go
199 lines
8.4 KiB
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// Symbol.go
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package expr
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import (
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"strings"
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)
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var symbolMap map[Symbol]symbolSpec
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type symbolClass int16
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const (
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symClassOperator symbolClass = iota
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symClassCommand
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symClassIdentifier
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symClassDelimiter
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symClassParenthesis
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symClassDeclaration
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symClassValue
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symClassOther
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)
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type symbolSpec struct {
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repr string
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kind symbolClass
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opType termPosition
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}
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func init() {
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symbolMap = map[Symbol]symbolSpec{
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SymUnknown: {"<unknown>", symClassOther, posLeaf}, // -1: Unknown symbol
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SymNone: {"<null>", symClassOther, posLeaf}, // 0: Null value for variable of type symbol
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SymError: {"<error>", symClassOther, posLeaf}, // 1: Error reading from stream
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SymEos: {"<eos>", symClassOther, posLeaf}, // 2: End of stream
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SymMinus: {"-", symClassOperator, posInfix}, // 3: '-'
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SymMinusEqual: {"-=", symClassOperator, posInfix}, // 4: '-='
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SymDoubleMinus: {"--", symClassOperator, posPostfix}, // 5: '--'
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SymPlus: {"+", symClassOperator, posInfix}, // 6: '+'
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SymPlusEqual: {"+=", symClassOperator, posInfix}, // 7: '+='
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SymDoublePlus: {"++", symClassOperator, posPostfix}, // 8: '++'
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SymStar: {"*", symClassOperator, posInfix}, // 9: '*'
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SymDoubleStar: {"**", symClassOperator, posInfix}, // 10: '**'
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SymSlash: {"/", symClassOperator, posInfix}, // 11: '/'
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SymBackSlash: {"\\", symClassOperator, posLeaf}, // 12: '\'
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SymVertBar: {"|", symClassOperator, posInfix}, // 13: '|'
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SymDoubleVertBar: {"||", symClassOperator, posInfix}, // 14: '||'
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SymComma: {",", symClassOperator, posInfix}, // 15: ','
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SymColon: {":", symClassOperator, posInfix}, // 16: ':'
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SymSemiColon: {";", symClassOperator, posInfix}, // 17: ';'
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SymDot: {".", symClassOperator, posInfix}, // 18: '.'
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SymDotSlash: {"./", symClassOperator, posInfix}, // 19: './'
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SymQuote: {"'", symClassDelimiter, posLeaf}, // 20: '\''
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SymDoubleQuote: {"\"", symClassDelimiter, posLeaf}, // 21: '"'
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SymBackTick: {"`", symClassDelimiter, posLeaf}, // 22: '`'
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SymExclamation: {"!", symClassOperator, posPostfix}, // 23: '!'
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SymQuestion: {"?", symClassOperator, posInfix}, // 24: '?'
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SymAmpersand: {"&", symClassOperator, posInfix}, // 25: '&'
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SymDoubleAmpersand: {"&&", symClassOperator, posInfix}, // 26: '&&'
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SymPercent: {"%", symClassOperator, posInfix}, // 27: '%'
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SymAt: {"@", symClassOperator, posPrefix}, // 28: '@'
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SymUndescore: {"_", symClassIdentifier, posLeaf}, // 29: '_'
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SymEqual: {"=", symClassOperator, posInfix}, // 30: '='
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SymDoubleEqual: {"==", symClassOperator, posInfix}, // 31: '=='
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SymLess: {"<", symClassOperator, posInfix}, // 32: '<'
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SymLessOrEqual: {"<=", symClassOperator, posInfix}, // 33: '<='
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SymGreater: {">", symClassOperator, posInfix}, // 34: '>'
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SymGreaterOrEqual: {">=", symClassOperator, posInfix}, // 35: '>='
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SymLessGreater: {"<>", symClassOperator, posInfix}, // 36: '<>'
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SymNotEqual: {"!=", symClassOperator, posInfix}, // 37: '!='
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SymDollar: {"$", symClassOperator, posPrefix}, // 38: '$'
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SymHash: {"#", symClassOperator, posPrefix}, // 39: '#'
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SymOpenRound: {"(", symClassParenthesis, posPrefix}, // 40: '('
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SymClosedRound: {")", symClassParenthesis, posPostfix}, // 41: ')'
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SymOpenSquare: {"[", symClassParenthesis, posPrefix}, // 42: '['
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SymClosedSquare: {"]", symClassParenthesis, posPostfix}, // 43: ']'
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SymOpenBrace: {"{", symClassParenthesis, posPrefix}, // 44: '{'
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SymClosedBrace: {"}", symClassParenthesis, posPostfix}, // 45: '}'
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SymTilde: {"~", symClassOperator, posPrefix}, // 46: '~'
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SymDoubleQuestion: {"??", symClassOperator, posInfix}, // 47: '??'
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SymQuestionEqual: {"?=", symClassOperator, posInfix}, // 48: '?='
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SymQuestionExclam: {"?!", symClassOperator, posInfix}, // 49: '?!'
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SymDoubleAt: {"@@", symClassCommand, posLeaf}, // 50: '@@'
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SymDoubleColon: {"::", symClassOperator, posInfix}, // 51: '::'
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SymDoubleGreater: {">>", symClassOperator, posInfix}, // 52: '>>'
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SymDoubleLess: {"<<", symClassOperator, posInfix}, // 53: '<<'
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SymCaret: {"^", symClassOperator, posInfix}, // 54: '^'
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SymDollarRound: {"$(", symClassOperator, posPrefix}, // 55: '$('
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SymOpenClosedRound: {"()", symClassOperator, posPostfix}, // 56: '()'
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SymDoubleDollar: {"$$", symClassCommand, posLeaf}, // 57: '$$'
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SymDoubleDot: {"..", symClassOperator, posInfix}, // 58: '..'
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SymTripleDot: {"...", symClassOperator, posPostfix}, // 59: '...'
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SymStarEqual: {"*=", symClassOperator, posInfix}, // 60: '*='
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SymSlashEqual: {"/=", symClassOperator, posInfix}, // 61: '/='
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SymPercEqual: {"%=", symClassOperator, posInfix}, // 62: '%='
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SymDoubleLessEqual: {"<<=", symClassOperator, posInfix}, // 63: '<<='
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SymDoubleGreaterEqual: {">>=", symClassOperator, posInfix}, // 64: '>>='
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SymAmpersandEqual: {"&=", symClassOperator, posInfix}, // 65: '&='
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SymVertBarEqual: {"|=", symClassOperator, posInfix}, // 65: '|='
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SymCaretEqual: {"^=", symClassOperator, posInfix}, // 66: '^='
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SymPlusGreater: {"+>", symClassOperator, posInfix}, // 67: '+>'
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SymLessPlus: {"<+", symClassOperator, posInfix}, // 68: '<+'
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SymPreInc: {"++", symClassOperator, posPrefix}, // : '++'
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SymPreDec: {"--", symClassOperator, posPrefix}, // : '--'
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// SymChangeSign
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// SymUnchangeSign
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// SymIdentifier
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// SymBool
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// SymInteger
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// SymVariable
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// SymFloat
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// SymFraction
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// SymString
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// SymIterator
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// SymOr: "or",
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// SymAnd: "and",
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// SymNot: "not",
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// SymComment
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// SymFuncCall
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// SymFuncDef
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// SymList
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// SymDict
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// SymIndex
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// SymExpression
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// SymSelector // <selector> ::= <expr> "?" <selector-case> {":" <selector-case>} ["::" <default-selector-case>]
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// SymSelectorCase // <selector-case> ::= [<list>] "{" <multi-expr> "}"
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// // SymOpenComment // 0: '/*'
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// // SymClosedComment // 0: '*/'
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// // SymOneLineComment // 0: '//'
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// keywordBase
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SymKwAnd: {"and", symClassOperator, posInfix},
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SymKwNot: {"not", symClassOperator, posInfix},
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SymKwOr: {"or", symClassOperator, posInfix},
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SymKwBut: {"but", symClassOperator, posInfix},
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SymKwFunc: {"func(", symClassDeclaration, posPrefix},
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SymKwBuiltin: {"builtin", symClassOperator, posPrefix},
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SymKwPlugin: {"plugin", symClassOperator, posPrefix},
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SymKwIn: {"in", symClassOperator, posInfix},
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SymKwInclude: {"include", symClassOperator, posPrefix},
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SymKwNil: {"nil", symClassValue, posLeaf},
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SymKwUnset: {"unset", symClassOperator, posPrefix},
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}
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}
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func SymToString(sym Symbol) string {
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if s, ok := symbolMap[sym]; ok {
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return s.repr
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}
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return ""
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}
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func SymListToString(symList []Symbol, quote bool) string {
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var sb strings.Builder
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if len(symList) == 0 {
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sb.WriteString("<nothing>")
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} else {
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for _, sym := range symList {
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if sb.Len() > 0 {
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sb.WriteByte(',')
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sb.WriteByte(' ')
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}
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if quote {
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sb.WriteByte('`')
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}
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sb.WriteString(SymToString(sym))
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if quote {
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sb.WriteByte('`')
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}
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}
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}
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return sb.String()
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}
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func StringEndsWithOperator(s string) bool {
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return endingOperator(s) != SymNone
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}
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func endingOperator(s string) (sym Symbol) {
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var matchLength = 0
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sym = SymNone
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lower := strings.TrimRight(strings.ToLower(s), " \t")
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for symbol, spec := range symbolMap {
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if strings.HasSuffix(lower, spec.repr) {
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if len(spec.repr) > matchLength {
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matchLength = len(spec.repr)
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if spec.kind == symClassOperator && (spec.opType == posInfix || spec.opType == posPrefix) {
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sym = symbol
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} else {
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sym = SymNone
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}
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}
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}
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}
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return
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}
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