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5
glow-core/src/main/java/com/naulian/glow_core/KotlinIndentation.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package com.naulian.glow_core | ||
|
|
||
| private val symbols = listOf( | ||
| '*', '.', '-', '@', '#', '$', '%', '^', '&', '?', | ||
| '|', '\\', '!', '{', '}', '(', ')', ',', ':', '>', | ||
| '<', ';', '+', '=', '[', ']', '/', '\'', '\"', | ||
| ) | ||
|
|
||
| class Lexer(private val source: CharSequence) { | ||
| private var cursor: Int = 0 | ||
| private fun char() = if (cursor < source.length) source[cursor] else Char.MIN_VALUE | ||
|
|
||
| fun nextToken(): Token { | ||
| return when (val c = char()) { | ||
| ' ' -> createSpaceToken() | ||
| '\n' -> createToken(Type.NEWLINE, c) | ||
| '*' -> createToken(Type.STAR, c) | ||
| '.' -> createToken(Type.DOT, c) | ||
| '-' -> createToken(Type.DASH, c) | ||
| '@' -> createToken(Type.AT, c) | ||
| '#' -> createToken(Type.HASH, c) | ||
| '$' -> createToken(Type.DOLLAR, c) | ||
| '%' -> createToken(Type.MODULO, c) | ||
| '^' -> createToken(Type.POW, c) | ||
| '&' -> createToken(Type.AND, c) | ||
| '?' -> createToken(Type.Q_MARK, c) | ||
| '|' -> createToken(Type.OR, c) | ||
| '\\' -> createToken(Type.B_SLASH, c) | ||
| '!' -> createToken(Type.BANG, c) | ||
| '{' -> createToken(Type.L_BRACE, c) | ||
| '}' -> createToken(Type.R_BRACE, c) | ||
| '(' -> createToken(Type.L_PAREN, c) | ||
| ')' -> createToken(Type.R_PAREN, c) | ||
| ',' -> createToken(Type.COMMA, c) | ||
| ':' -> createToken(Type.COLON, c) | ||
| '>' -> createToken(Type.GT, c) | ||
| '<' -> createToken(Type.LT, c) | ||
| ';' -> createToken(Type.S_COLON, c) | ||
| '+' -> createToken(Type.PLUS, c) | ||
| '=' -> createToken(Type.EQUAL_TO, c) | ||
| '[' -> createToken(Type.L_BRACKET, c) | ||
| ']' -> createToken(Type.R_BRACKET, c) | ||
| '/' -> createToken(Type.F_SLASH, c) | ||
| '\'' -> createToken(Type.S_QUOTE, c) | ||
| '\"' -> createToken(Type.D_QUOTE, c) | ||
| in '0'..'9' -> createNumberToken() | ||
| in 'a'..'z', | ||
| in 'A'..'Z', | ||
| '_' -> createWordToken() | ||
|
|
||
| Char.MIN_VALUE -> createToken(Type.EOF, c) | ||
| else -> createToken(Type.ILLEGAL, c) | ||
| } | ||
| } | ||
|
|
||
| private fun peek(offset: Int = 1): Char { | ||
| val position = cursor + offset | ||
| return if (position < source.length) source[position] else Char.MIN_VALUE | ||
| } | ||
|
|
||
| private fun createToken(type: Type, value: Char): Token { | ||
| cursor++ | ||
| return Token(type, value.toString()) | ||
| } | ||
|
|
||
| private fun createSpaceToken(): Token { | ||
| val start = cursor | ||
| while (char() == ' ') { | ||
| cursor++ | ||
| } | ||
|
|
||
| val identifier = source.substring(start, cursor) | ||
| return Token(Type.SPACE, identifier) | ||
| } | ||
|
|
||
| private fun createWordToken(): Token { | ||
| val start = cursor | ||
| while (char().isLetter() || char() == '_' || char().isDigit()) { | ||
| cursor++ | ||
| } | ||
|
|
||
| val identifier = source.substring(start, cursor) | ||
| return Token(Type.WORD, identifier) | ||
| } | ||
|
|
||
| private fun createNumberToken(): Token { | ||
| val start = cursor | ||
|
|
||
| while ( | ||
| char().isDigit() || char() == '_' || | ||
| char() == 'L' || char() == 'f' || | ||
| char() == '.' | ||
| ) { | ||
| cursor++ | ||
| } | ||
| return Token(Type.NUMBER, source.substring(start, cursor)) | ||
| } | ||
| } |
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