TTokenType enumeration

In unit fpExprPars

Type representing different token types in expression parsing

Declaration

pascal

TTokenType = (ttPlus,ttMinus,ttLessThan,ttLargerThan,ttEqual,ttDiv,
 ttMod,ttMul,ttLeft,ttRight,ttLessThanEqual,
 ttLargerThanEqual,ttunequal,ttNumber,ttString,
 ttIdentifier,ttComma,ttAnd,ttOr,ttXor,ttTrue,ttFalse,
 ttNot,ttif,ttCase,ttPower,ttEOF)

Description

This enumeration defines all possible token types that can be encountered during expression parsing and lexical analysis. Each token type represents a fundamental unit of the expression language, from operators and keywords to literals and identifiers.

The token types are organized into several categories:

Arithmetic operators: ttPlus, ttMinus, ttMul, ttDiv, ttMod, ttPower
Comparison operators: ttEqual, ttUnequal, ttLessThan, ttLargerThan, ttLessThanEqual, ttLargerThanEqual
Logical operators: ttAnd, ttOr, ttXor, ttNot
Literals: ttNumber, ttString, ttTrue, ttFalse
Structure tokens: ttLeft, ttRight, ttComma
Keywords: ttIf, ttCase
Special tokens: ttIdentifier, ttEOF

The TFPExpressionScanner uses these token types to categorize input text during the lexical analysis phase of expression parsing.

Values

`ttPlus`	Plus operator token (+)
`ttMinus`	Minus operator token (-)
`ttLessThan`	Less than comparison operator token (<)
`ttLargerThan`	Greater than comparison operator token (>)
`ttEqual`	Equality comparison operator token (=)
`ttDiv`	Division operator token (/)
`ttMod`	Modulo operator token (mod)
`ttMul`	Multiplication operator token (*)
`ttLeft`	Left parenthesis token (()
`ttRight`	Right parenthesis token ())
`ttLessThanEqual`	Less than or equal comparison operator token (<=)
`ttLargerThanEqual`	Greater than or equal comparison operator token (>=)
`ttunequal`	Inequality comparison operator token (<>)
`ttNumber`	Numeric literal token
`ttString`	String literal token
`ttIdentifier`	Identifier token (variable or function name)
`ttComma`	Comma separator token (,)
`ttAnd`	Logical AND operator token (and)
`ttOr`	Logical OR operator token (or)
`ttXor`	Logical XOR operator token (xor)
`ttTrue`	Boolean true literal token
`ttFalse`	Boolean false literal token
`ttNot`	Logical NOT operator token (not)
`ttif`	Conditional if keyword token
`ttCase`	Case conditional keyword token
`ttPower`	Power/exponentiation operator token (**)
`ttEOF`	End of file token marking end of input

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.