Execute input in the REPL.
Guesses whether the input is an expression or statement and handles it appropriately. Finally, after over a year, the Wren REPL automatically prints "3" if you type in "1 + 2". \o/
This commit is contained in:
Bob Nystrom
+145
-78
@@ -1,3 +1,4 @@
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import "meta" for Meta
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import "io" for Stdin
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class EscapeBracket {
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@@ -38,7 +39,7 @@ class Repl {
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} else if (byte == Chars.escape) {
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handleEscape()
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} else if (byte == Chars.carriageReturn) {
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executeLine()
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executeInput()
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} else if (byte == Chars.delete) {
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deleteLeft()
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} else if (byte >= Chars.space && byte <= Chars.tilde) {
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@@ -100,11 +101,73 @@ class Repl {
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}
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}
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executeLine() {
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// TODO: Execute line.
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executeInput() {
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System.print()
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var input = _line
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_line = ""
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_cursor = 0
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System.print()
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// Guess if it looks like a statement or expression. Statements need to be
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// evaluated at the top level in case they declare variables, but they
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// don't return a value. Expressions need to have their result displayed.
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var tokens = lex(input, false)
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if (tokens.isEmpty) {
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// No code, so do nothing.
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// TODO: Temp.
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System.print("empty")
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return
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}
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var first = tokens[0]
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var isStatement =
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first.type == Token.breakKeyword ||
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first.type == Token.classKeyword ||
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first.type == Token.forKeyword ||
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first.type == Token.foreignKeyword ||
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first.type == Token.ifKeyword ||
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first.type == Token.importKeyword ||
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first.type == Token.returnKeyword ||
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first.type == Token.varKeyword ||
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first.type == Token.whileKeyword
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var fiber
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if (isStatement) {
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fiber = Fiber.new {
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Meta.eval(input)
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}
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var result = fiber.try()
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if (fiber.error == null) return
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} else {
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var function = Meta.compileExpression(input)
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if (function == null) return
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fiber = Fiber.new(function)
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var result = fiber.try()
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if (fiber.error == null) {
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// TODO: Handle error in result.toString.
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System.print("%(Color.brightWhite)%(result)%(Color.none)")
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return
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}
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System.print("%(Color.red)Runtime error: %(result)%(Color.none)")
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// TODO: Print entire stack.
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}
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lex(line, includeWhitespace) {
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var lexer = Lexer.new(line)
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var tokens = []
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while (true) {
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var token = lexer.readToken()
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if (token.type == Token.eof) break
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if (includeWhitespace ||
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(token.type != Token.comment && token.type != Token.whitespace)) {
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tokens.add(token)
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}
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}
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return tokens
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}
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refreshLine() {
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@@ -113,14 +176,11 @@ class Repl {
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// Show the prompt at the beginning of the line.
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System.write(Color.gray)
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System.write("\r>> ")
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System.write("\r> ")
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System.write(Color.none)
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// Syntax highlight the line.
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var lexer = Lexer.new(_line)
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while (true) {
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var token = lexer.readToken()
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for (token in lex(_line, true)) {
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if (token.type == Token.eof) break
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System.write(TOKEN_COLORS[token.type])
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@@ -129,7 +189,7 @@ class Repl {
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}
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// Position the cursor.
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System.write("\r\x1b[%(3 + _cursor)C")
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System.write("\r\x1b[%(2 + _cursor)C")
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}
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}
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@@ -146,6 +206,8 @@ class Color {
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static white { "\x1b[37m" }
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static gray { "\x1b[30;1m" }
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static pink { "\x1b[31;1m" }
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static brightWhite { "\x1b[37;1m" }
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}
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/// Utilities for working with characters.
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@@ -329,6 +391,74 @@ var KEYWORDS = {
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"while": Token.whileKeyword
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}
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var TOKEN_COLORS = {
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Token.leftParen: Color.gray,
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Token.rightParen: Color.gray,
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Token.leftBracket: Color.gray,
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Token.rightBracket: Color.gray,
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Token.leftBrace: Color.gray,
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Token.rightBrace: Color.gray,
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Token.colon: Color.gray,
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Token.dot: Color.gray,
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Token.dotDot: Color.none,
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Token.dotDotDot: Color.none,
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Token.comma: Color.gray,
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Token.star: Color.none,
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Token.slash: Color.none,
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Token.percent: Color.none,
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Token.plus: Color.none,
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Token.minus: Color.none,
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Token.pipe: Color.none,
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Token.pipePipe: Color.none,
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Token.caret: Color.none,
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Token.amp: Color.none,
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Token.ampAmp: Color.none,
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Token.question: Color.none,
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Token.bang: Color.none,
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Token.tilde: Color.none,
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Token.equal: Color.none,
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Token.less: Color.none,
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Token.lessEqual: Color.none,
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Token.lessLess: Color.none,
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Token.greater: Color.none,
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Token.greaterEqual: Color.none,
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Token.greaterGreater: Color.none,
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Token.equalEqual: Color.none,
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Token.bangEqual: Color.none,
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// Keywords.
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Token.breakKeyword: Color.cyan,
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Token.classKeyword: Color.cyan,
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Token.constructKeyword: Color.cyan,
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Token.elseKeyword: Color.cyan,
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Token.falseKeyword: Color.cyan,
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Token.forKeyword: Color.cyan,
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Token.foreignKeyword: Color.cyan,
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Token.ifKeyword: Color.cyan,
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Token.importKeyword: Color.cyan,
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Token.inKeyword: Color.cyan,
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Token.isKeyword: Color.cyan,
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Token.nullKeyword: Color.cyan,
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Token.returnKeyword: Color.cyan,
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Token.staticKeyword: Color.cyan,
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Token.superKeyword: Color.cyan,
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Token.thisKeyword: Color.cyan,
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Token.trueKeyword: Color.cyan,
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Token.varKeyword: Color.cyan,
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Token.whileKeyword: Color.cyan,
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Token.field: Color.none,
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Token.name: Color.none,
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Token.number: Color.magenta,
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Token.string: Color.yellow,
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Token.interpolation: Color.yellow,
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Token.comment: Color.gray,
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Token.whitespace: Color.none,
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Token.line: Color.none,
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Token.error: Color.red,
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Token.eof: Color.none,
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}
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// Data table for tokens that are tokenized using maximal munch.
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//
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// The key is the character that starts the token or tokens. After that is a
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@@ -360,6 +490,10 @@ var PUNCTUATORS = {
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Chars.dot: [Token.dot, Chars.dot, Token.dotDot, Chars.dot, Token.dotDotDot]
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}
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/// Tokenizes a string of input. This lexer differs from most in that it
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/// silently ignores errors from incomplete input, like a string literal with
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/// no closing quote. That's because this is intended to be run on a line of
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/// input while the user is still typing it.
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class Lexer {
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construct new(source) {
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_source = source
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@@ -599,72 +733,5 @@ class Lexer {
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makeToken(type) { Token.new(_source, type, _start, _current - _start) }
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}
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var TOKEN_COLORS = {
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Token.leftParen: Color.gray,
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Token.rightParen: Color.gray,
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Token.leftBracket: Color.gray,
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Token.rightBracket: Color.gray,
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Token.leftBrace: Color.gray,
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Token.rightBrace: Color.gray,
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Token.colon: Color.gray,
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Token.dot: Color.gray,
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Token.dotDot: Color.none,
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Token.dotDotDot: Color.none,
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Token.comma: Color.gray,
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Token.star: Color.none,
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Token.slash: Color.none,
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Token.percent: Color.none,
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Token.plus: Color.none,
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Token.minus: Color.none,
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Token.pipe: Color.none,
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Token.pipePipe: Color.none,
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Token.caret: Color.none,
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Token.amp: Color.none,
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Token.ampAmp: Color.none,
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Token.question: Color.none,
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Token.bang: Color.none,
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Token.tilde: Color.none,
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Token.equal: Color.none,
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Token.less: Color.none,
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Token.lessEqual: Color.none,
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Token.lessLess: Color.none,
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Token.greater: Color.none,
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Token.greaterEqual: Color.none,
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Token.greaterGreater: Color.none,
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Token.equalEqual: Color.none,
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Token.bangEqual: Color.none,
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// Keywords.
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Token.breakKeyword: Color.cyan,
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Token.classKeyword: Color.cyan,
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Token.constructKeyword: Color.cyan,
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Token.elseKeyword: Color.cyan,
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Token.falseKeyword: Color.cyan,
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Token.forKeyword: Color.cyan,
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Token.foreignKeyword: Color.cyan,
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Token.ifKeyword: Color.cyan,
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Token.importKeyword: Color.cyan,
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Token.inKeyword: Color.cyan,
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Token.isKeyword: Color.cyan,
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Token.nullKeyword: Color.cyan,
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Token.returnKeyword: Color.cyan,
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Token.staticKeyword: Color.cyan,
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Token.superKeyword: Color.cyan,
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Token.thisKeyword: Color.cyan,
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Token.trueKeyword: Color.cyan,
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Token.varKeyword: Color.cyan,
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Token.whileKeyword: Color.cyan,
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Token.field: Color.none,
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Token.name: Color.none,
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Token.number: Color.magenta,
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Token.string: Color.yellow,
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Token.interpolation: Color.yellow,
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Token.comment: Color.gray,
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Token.whitespace: Color.none,
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Token.line: Color.none,
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Token.error: Color.red,
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Token.eof: Color.none,
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}
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// Fire up the REPL.
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Repl.new().run()
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+147
-78
@@ -1,5 +1,6 @@
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// Generated automatically from src/module/repl.wren. Do not edit.
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static const char* replModuleSource =
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"import \"meta\" for Meta\n"
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"import \"io\" for Stdin\n"
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"\n"
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"class EscapeBracket {\n"
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@@ -40,7 +41,7 @@ static const char* replModuleSource =
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" } else if (byte == Chars.escape) {\n"
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" handleEscape()\n"
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" } else if (byte == Chars.carriageReturn) {\n"
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" executeLine()\n"
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" executeInput()\n"
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" } else if (byte == Chars.delete) {\n"
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" deleteLeft()\n"
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" } else if (byte >= Chars.space && byte <= Chars.tilde) {\n"
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@@ -102,11 +103,75 @@ static const char* replModuleSource =
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" }\n"
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" }\n"
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"\n"
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" executeLine() {\n"
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" // TODO: Execute line.\n"
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" executeInput() {\n"
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" System.print()\n"
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" var input = _line\n"
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" _line = \"\"\n"
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" _cursor = 0\n"
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" System.print()\n"
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"\n"
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" // Guess if it looks like a statement or expression. Statements need to be\n"
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" // evaluated at the top level in case they declare variables, but they\n"
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" // don't return a value. Expressions need to have their result displayed.\n"
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" var tokens = lex(input, false)\n"
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" if (tokens.isEmpty) {\n"
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" // No code, so do nothing.\n"
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" // TODO: Temp.\n"
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" System.print(\"empty\")\n"
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" return\n"
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" }\n"
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"\n"
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" var first = tokens[0]\n"
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" var isStatement =\n"
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" first.type == Token.breakKeyword ||\n"
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" first.type == Token.classKeyword ||\n"
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" first.type == Token.forKeyword ||\n"
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" first.type == Token.foreignKeyword ||\n"
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" first.type == Token.ifKeyword ||\n"
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" first.type == Token.importKeyword ||\n"
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" first.type == Token.returnKeyword ||\n"
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" first.type == Token.varKeyword ||\n"
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" first.type == Token.whileKeyword\n"
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"\n"
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" if (isStatement) {\n"
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" var fiber = Fiber.new {\n"
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" Meta.eval(input)\n"
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" }\n"
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"\n"
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" var result = fiber.try()\n"
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" if (fiber.error != null) {\n"
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" System.print(\"%(Color.red)Runtime error: %(result)%(Color.none)\")\n"
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" // TODO: Print entire stack.\n"
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" }\n"
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" } else {\n"
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" var function = Meta.compileExpression(input)\n"
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" if (function == null) return\n"
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"\n"
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" var fiber = Fiber.new(function)\n"
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" var result = fiber.try()\n"
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" if (fiber.error == null) {\n"
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" // TODO: Handle error in result.toString.\n"
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" System.print(\"%(Color.brightWhite)%(result)%(Color.none)\")\n"
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" } else {\n"
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" System.print(\"%(Color.red)Runtime error: %(result)%(Color.none)\")\n"
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" // TODO: Print entire stack.\n"
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" }\n"
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" }\n"
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" }\n"
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"\n"
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" lex(line, includeWhitespace) {\n"
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" var lexer = Lexer.new(line)\n"
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" var tokens = []\n"
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" while (true) {\n"
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" var token = lexer.readToken()\n"
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" if (token.type == Token.eof) break\n"
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"\n"
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" if (includeWhitespace ||\n"
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" (token.type != Token.comment && token.type != Token.whitespace)) {\n"
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" tokens.add(token)\n"
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" }\n"
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" }\n"
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"\n"
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" return tokens\n"
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" }\n"
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"\n"
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" refreshLine() {\n"
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@@ -115,14 +180,11 @@ static const char* replModuleSource =
|
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"\n"
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" // Show the prompt at the beginning of the line.\n"
|
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" System.write(Color.gray)\n"
|
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" System.write(\"\r>> \")\n"
|
||||
" System.write(\"\r> \")\n"
|
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" System.write(Color.none)\n"
|
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"\n"
|
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" // Syntax highlight the line.\n"
|
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" var lexer = Lexer.new(_line)\n"
|
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"\n"
|
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" while (true) {\n"
|
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" var token = lexer.readToken()\n"
|
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" for (token in lex(_line, true)) {\n"
|
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" if (token.type == Token.eof) break\n"
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"\n"
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" System.write(TOKEN_COLORS[token.type])\n"
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@@ -131,7 +193,7 @@ static const char* replModuleSource =
|
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" }\n"
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"\n"
|
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" // Position the cursor.\n"
|
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" System.write(\"\r\x1b[%(3 + _cursor)C\")\n"
|
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" System.write(\"\r\x1b[%(2 + _cursor)C\")\n"
|
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" }\n"
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"}\n"
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"\n"
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@@ -148,6 +210,8 @@ static const char* replModuleSource =
|
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" static white { \"\x1b[37m\" }\n"
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"\n"
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" static gray { \"\x1b[30;1m\" }\n"
|
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" static pink { \"\x1b[31;1m\" }\n"
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" static brightWhite { \"\x1b[37;1m\" }\n"
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"}\n"
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"\n"
|
||||
"/// Utilities for working with characters.\n"
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@@ -331,6 +395,74 @@ static const char* replModuleSource =
|
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" \"while\": Token.whileKeyword\n"
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"}\n"
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"\n"
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"var TOKEN_COLORS = {\n"
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" Token.leftParen: Color.gray,\n"
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" Token.rightParen: Color.gray,\n"
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" Token.leftBracket: Color.gray,\n"
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" Token.rightBracket: Color.gray,\n"
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" Token.leftBrace: Color.gray,\n"
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" Token.rightBrace: Color.gray,\n"
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" Token.colon: Color.gray,\n"
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" Token.dot: Color.gray,\n"
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" Token.dotDot: Color.none,\n"
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" Token.dotDotDot: Color.none,\n"
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" Token.comma: Color.gray,\n"
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" Token.star: Color.none,\n"
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" Token.slash: Color.none,\n"
|
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" Token.percent: Color.none,\n"
|
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" Token.plus: Color.none,\n"
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" Token.minus: Color.none,\n"
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" Token.pipe: Color.none,\n"
|
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" Token.pipePipe: Color.none,\n"
|
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" Token.caret: Color.none,\n"
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" Token.amp: Color.none,\n"
|
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" Token.ampAmp: Color.none,\n"
|
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" Token.question: Color.none,\n"
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" Token.bang: Color.none,\n"
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" Token.tilde: Color.none,\n"
|
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" Token.equal: Color.none,\n"
|
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" Token.less: Color.none,\n"
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" Token.lessEqual: Color.none,\n"
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" Token.lessLess: Color.none,\n"
|
||||
" Token.greater: Color.none,\n"
|
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" Token.greaterEqual: Color.none,\n"
|
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" Token.greaterGreater: Color.none,\n"
|
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" Token.equalEqual: Color.none,\n"
|
||||
" Token.bangEqual: Color.none,\n"
|
||||
"\n"
|
||||
" // Keywords.\n"
|
||||
" Token.breakKeyword: Color.cyan,\n"
|
||||
" Token.classKeyword: Color.cyan,\n"
|
||||
" Token.constructKeyword: Color.cyan,\n"
|
||||
" Token.elseKeyword: Color.cyan,\n"
|
||||
" Token.falseKeyword: Color.cyan,\n"
|
||||
" Token.forKeyword: Color.cyan,\n"
|
||||
" Token.foreignKeyword: Color.cyan,\n"
|
||||
" Token.ifKeyword: Color.cyan,\n"
|
||||
" Token.importKeyword: Color.cyan,\n"
|
||||
" Token.inKeyword: Color.cyan,\n"
|
||||
" Token.isKeyword: Color.cyan,\n"
|
||||
" Token.nullKeyword: Color.cyan,\n"
|
||||
" Token.returnKeyword: Color.cyan,\n"
|
||||
" Token.staticKeyword: Color.cyan,\n"
|
||||
" Token.superKeyword: Color.cyan,\n"
|
||||
" Token.thisKeyword: Color.cyan,\n"
|
||||
" Token.trueKeyword: Color.cyan,\n"
|
||||
" Token.varKeyword: Color.cyan,\n"
|
||||
" Token.whileKeyword: Color.cyan,\n"
|
||||
"\n"
|
||||
" Token.field: Color.none,\n"
|
||||
" Token.name: Color.none,\n"
|
||||
" Token.number: Color.magenta,\n"
|
||||
" Token.string: Color.yellow,\n"
|
||||
" Token.interpolation: Color.yellow,\n"
|
||||
" Token.comment: Color.gray,\n"
|
||||
" Token.whitespace: Color.none,\n"
|
||||
" Token.line: Color.none,\n"
|
||||
" Token.error: Color.red,\n"
|
||||
" Token.eof: Color.none,\n"
|
||||
"}\n"
|
||||
"\n"
|
||||
"// Data table for tokens that are tokenized using maximal munch.\n"
|
||||
"//\n"
|
||||
"// The key is the character that starts the token or tokens. After that is a\n"
|
||||
@@ -362,6 +494,10 @@ static const char* replModuleSource =
|
||||
" Chars.dot: [Token.dot, Chars.dot, Token.dotDot, Chars.dot, Token.dotDotDot]\n"
|
||||
"}\n"
|
||||
"\n"
|
||||
"/// Tokenizes a string of input. This lexer differs from most in that it\n"
|
||||
"/// silently ignores errors from incomplete input, like a string literal with\n"
|
||||
"/// no closing quote. That's because this is intended to be run on a line of\n"
|
||||
"/// input while the user is still typing it.\n"
|
||||
"class Lexer {\n"
|
||||
" construct new(source) {\n"
|
||||
" _source = source\n"
|
||||
@@ -601,72 +737,5 @@ static const char* replModuleSource =
|
||||
" makeToken(type) { Token.new(_source, type, _start, _current - _start) }\n"
|
||||
"}\n"
|
||||
"\n"
|
||||
"var TOKEN_COLORS = {\n"
|
||||
" Token.leftParen: Color.gray,\n"
|
||||
" Token.rightParen: Color.gray,\n"
|
||||
" Token.leftBracket: Color.gray,\n"
|
||||
" Token.rightBracket: Color.gray,\n"
|
||||
" Token.leftBrace: Color.gray,\n"
|
||||
" Token.rightBrace: Color.gray,\n"
|
||||
" Token.colon: Color.gray,\n"
|
||||
" Token.dot: Color.gray,\n"
|
||||
" Token.dotDot: Color.none,\n"
|
||||
" Token.dotDotDot: Color.none,\n"
|
||||
" Token.comma: Color.gray,\n"
|
||||
" Token.star: Color.none,\n"
|
||||
" Token.slash: Color.none,\n"
|
||||
" Token.percent: Color.none,\n"
|
||||
" Token.plus: Color.none,\n"
|
||||
" Token.minus: Color.none,\n"
|
||||
" Token.pipe: Color.none,\n"
|
||||
" Token.pipePipe: Color.none,\n"
|
||||
" Token.caret: Color.none,\n"
|
||||
" Token.amp: Color.none,\n"
|
||||
" Token.ampAmp: Color.none,\n"
|
||||
" Token.question: Color.none,\n"
|
||||
" Token.bang: Color.none,\n"
|
||||
" Token.tilde: Color.none,\n"
|
||||
" Token.equal: Color.none,\n"
|
||||
" Token.less: Color.none,\n"
|
||||
" Token.lessEqual: Color.none,\n"
|
||||
" Token.lessLess: Color.none,\n"
|
||||
" Token.greater: Color.none,\n"
|
||||
" Token.greaterEqual: Color.none,\n"
|
||||
" Token.greaterGreater: Color.none,\n"
|
||||
" Token.equalEqual: Color.none,\n"
|
||||
" Token.bangEqual: Color.none,\n"
|
||||
"\n"
|
||||
" // Keywords.\n"
|
||||
" Token.breakKeyword: Color.cyan,\n"
|
||||
" Token.classKeyword: Color.cyan,\n"
|
||||
" Token.constructKeyword: Color.cyan,\n"
|
||||
" Token.elseKeyword: Color.cyan,\n"
|
||||
" Token.falseKeyword: Color.cyan,\n"
|
||||
" Token.forKeyword: Color.cyan,\n"
|
||||
" Token.foreignKeyword: Color.cyan,\n"
|
||||
" Token.ifKeyword: Color.cyan,\n"
|
||||
" Token.importKeyword: Color.cyan,\n"
|
||||
" Token.inKeyword: Color.cyan,\n"
|
||||
" Token.isKeyword: Color.cyan,\n"
|
||||
" Token.nullKeyword: Color.cyan,\n"
|
||||
" Token.returnKeyword: Color.cyan,\n"
|
||||
" Token.staticKeyword: Color.cyan,\n"
|
||||
" Token.superKeyword: Color.cyan,\n"
|
||||
" Token.thisKeyword: Color.cyan,\n"
|
||||
" Token.trueKeyword: Color.cyan,\n"
|
||||
" Token.varKeyword: Color.cyan,\n"
|
||||
" Token.whileKeyword: Color.cyan,\n"
|
||||
"\n"
|
||||
" Token.field: Color.none,\n"
|
||||
" Token.name: Color.none,\n"
|
||||
" Token.number: Color.magenta,\n"
|
||||
" Token.string: Color.yellow,\n"
|
||||
" Token.interpolation: Color.yellow,\n"
|
||||
" Token.comment: Color.gray,\n"
|
||||
" Token.whitespace: Color.none,\n"
|
||||
" Token.line: Color.none,\n"
|
||||
" Token.error: Color.red,\n"
|
||||
" Token.eof: Color.none,\n"
|
||||
"}\n"
|
||||
"\n"
|
||||
"// Fire up the REPL.\n"
|
||||
"Repl.new().run()\n";
|
||||
|
||||
Reference in New Issue
Block a user