Non puoi selezionare più di 25 argomenti
Gli argomenti devono iniziare con una lettera o un numero, possono includere trattini ('-') e possono essere lunghi fino a 35 caratteri.
357 righe
7.7 KiB
357 righe
7.7 KiB
// Utils
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println = (x) {
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if (!x) {
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print("\n");
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} else {
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print(x, "\n", full: 1);
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}
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};
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Object.subtype(name) { self.new(__name__: name) }
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// Input stream
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Stream = Object.subtype(#Stream);
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newStream(string) {
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self = Stream.new(
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content: string,
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position: 0,
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limit: len(string)
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);
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print("Created new stream object: { position: ", self.position, ", limit: ", self.limit, ", !atEnd(): ", !self.atEnd(), " }\n");
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self;
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}
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Stream.atEnd() { self.position >= self.limit }
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Stream.peek() { !self.atEnd() && self.content[self.position] }
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Stream.inc() { !self.atEnd() && { self.position = self.position + 1; } }
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Stream.next() {
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!self.atEnd() && {
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c = self.content[self.position];
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self.position = self.position + 1;
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c;
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}
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}
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Stream.setLastBegin = () { self.lastBegin = self.position; };
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// Context
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Context = Object.subtype(#Context);
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Context.init() { self.variables = []; self; }
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Context.declareVariable(var) { self.variables[var] = nil }
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// String Literal
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StringLiteral = Object.subtype(#StringLiteral);
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StringLiteral.match(stream, context, actions) {
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n = len(self.string);
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i = 0;
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success = 1;
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startCursor = stream.cursor;
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while(i < n && success == 1) {
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if (self.string[i] != stream.peek()) {
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success = 0;
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stream.cursor = startCursor;
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} else {
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i = i + 1;
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stream.inc();
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}
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}
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success;
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}
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// Character Class
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CharacterClass = Object.subtype(#CharacterClass);
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CharacterClass.match(stream, context, actions) {
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classLength = len(self.value);
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i = 0;
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prevChar = nil;
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success = 0;
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while (i < classLength && success == 0) {
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// [a] case
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if (prevChar == nil) {
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// println("[a] case");
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prevChar = self.value[i];
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if (stream.peek() == self.value[i]) {
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success = 1;
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}
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} else if (prevChar != nil && self.value[i] == ord('-')) {
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// [a-z] case
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if (i+1 < classLength) {
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// println("[a-z] case");
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rangeStart = charValue(prevChar);
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rangeEnd = charValue(self.value[i+1]);
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// print("Range Start: ", rangeStart, " | ");
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// print("Range End: ", rangeEnd, "\n");
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if (charValue(stream.peek()) >= rangeStart
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&& charValue(stream.peek()) <= rangeEnd
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) {
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success = 1;
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}
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prevChar = nil;
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i = i + 1;
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// [a-] case
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} else {
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// println("[a-] case");
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if (stream.peek() == ord('-')) {
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success = 1;
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}
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}
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// [ab] case
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} else if (prevChar != nil && self.value[i] != ord('-')) {
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// println("[ab] case");
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prevChar = self.value[i];
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if (stream.peek() == self.value[i]) {
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success = 1;
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}
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}
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// print("prevChar: ", prevChar, "\n");
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i = i + 1;
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}
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if (success == 1) {
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stream.inc();
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}
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success;
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}
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// Dot
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Dot = Object.subtype(#Dot);
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Dot.match(stream, context, actions) {
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if (stream.peek() != nil) {
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stream.inc();
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1;
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} else {
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0;
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}
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}
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// Begin
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Begin = Object.subtype(#Begin);
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Begin.match(stream, context, actions) {
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stream.setLastBegin();
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1;
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}
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// End
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End = Object.subtype(#End);
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End.match(stream, context, actions) {
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context.input = stream.string[stream.lastBegin..stream.cursor];
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1;
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}
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// Optional (? postfix operator)
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Optional = Object.subtype(#Optional);
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Optional.match(stream, context) {
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self.innerExpression.match(stream, context);
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1;
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}
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// Star
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Star = Object.subtype(#Star);
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Star.match(stream, context, actions) {
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while (self.innerExpression.match(stream, context) == 1) {}
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1;
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}
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// Plus
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Plus = Object.subtype(#Plus);
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Plus.match(stream, context, actions) {
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if (self.innerExpression.match(stream, context) == 1) {
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while (self.innerExpression.match(stream, context) == 1) {}
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1;
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} else {
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0;
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}
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}
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// And
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And = Object.subtype(#And);
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And.match(stream, context, actions) {
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position = stream.position;
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if (self.innerExpression.match(stream, context) == 1) {
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stream.position = position;
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1;
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} else {
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0;
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}
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}
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// Not
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Not = Object.subtype(#Not);
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Not.match(stream, context, actions) {
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position = stream.position;
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if (self.innerExpression.match(stream, context) == 1) {
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stream.position = position;
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0;
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} else {
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1;
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}
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}
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// Sequence
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Sequence = Object.subtype(#Sequence);
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Sequence.match(stream, context, actions) {
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i = 0;
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match = 1;
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while (i < self.length() && match == 1) {
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match = self[i].match(stream, context, actions);
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}
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match;
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}
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// Alternation
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Alternation = Object.subtype(#Alternation);
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Alternation.match(stream, context, actions) {
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i = 0;
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match = 0;
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while(i < self.length() && match == 0){
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initialActionCount = actions.length();
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match = self[i].match(stream, context, actions);
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if (match == 0) {
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while (actions.length() > initialActionCount) {
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actions.pop();
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}
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}
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}
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}
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// Action
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Action = Object.subtype(#Action);
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Action.match(stream, context, actions) {
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actions.push(self);
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self.context = context;
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1;
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}
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Action.execute() {
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// Declare all variables that a value is set to in the context
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for (statement in self.parseTree.body) {
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if (statement.__name__ == "SetVar") {
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self.context.declareVariable(statement.name);
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}
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}
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// Evaluate the parse tree and return to outer context if needed
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returnValue = eval(self.parseTree, env: self.context.variables);
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if (self.context.outerContext != nil) {
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self.context.outerContext.variables[self.context.returnValueName] = returnValue;
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}
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}
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// Assignment
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Assignment = Object.subtype(#Assignment);
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Assignment.match(stream, context, actions) {
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context.declareVariable(self.variableName);
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innerContext = Context.new(outerContext: context, returnValueName: self.variableName).init();
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self.rule.match(stream, innerContext, actions);
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}
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// Main
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// stream = newStream(readfile("input.txt"));
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stream = newStream("asdf1234");
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context = Context.new(outerContext: nil).init();
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actions = [];
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// s = StringLiteral.new(string: "ab");
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// print("Success : ", s.match(stream), "\n");
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// c = CharacterClass.new(value: " \n\t");
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// print("Parsing Character: ", stream.peek(), " | CharacterClass [", c.value,"] : ", c.match(stream), "\n");
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// d = Dot.new();
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// print("Parsing Character: ", stream.peek(), " | Dot : ", d.match(stream, context), "\n");
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println("\n--- Action Test ---\n");
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actionParseTree = `{
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innerVar = 151;
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};
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act = Action.new(parseTree: actionParseTree);
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assign = Assignment.new(variableName: #outerVar, rule: act);
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assign.match(stream, context, actions);
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actionParseTree2 = `{
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x = 69;
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};
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act2 = Action.new(parseTree: actionParseTree2);
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act2.match(stream, context, actions);
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for (action in actions) {
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action.execute();
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}
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print("global variable named innerVar => ", innerVar, " should be nil\n");
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print("global variable named x => ", x, " should be nil\n");
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print(context, "\n", full: 1);
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// c = CharacterClass.new(value: "a");
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// u = Not.new(innerExpression: c);
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// println(u.match(stream, context));
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// println(stream);
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//
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// println();
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// println();
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// println();
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//
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// gensokyo = [buses: 0, inhabitants: 1337];
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//
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// reimu = [location: gensokyo];
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// marisa = [location: gensokyo];
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//
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// println(marisa.location);
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// reimu.location.inhabitants = 42;
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// println(marisa.location);
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