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Loop parsing

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This commit is contained in:
Rafał Grodziński
2025-06-24 18:40:50 +09:00
parent 981854835e
commit 0c31072115
10 changed files with 131 additions and 13 deletions
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53
src/Parser/Parser.cpp
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@@ -15,6 +15,7 @@
#include "Parser/Statement/StatementExpression.h"
#include "Parser/Statement/StatementMetaExternFunction.h"
#include "Parser/Statement/StatementBlock.h"
#include "Parser/Statement/StatementLoop.h"
#include "Parser/Statement/StatementInvalid.h"
Parser::Parser(vector<shared_ptr<Token>> tokens): tokens(tokens) {
@@ -53,6 +54,10 @@ shared_ptr<Statement> Parser::nextStatement() {
statement = matchStatementReturn();
if (statement != nullptr)
return statement;
statement = matchStatementLoop();
if (statement != nullptr)
return statement;
statement = matchStatementExpression();
if (statement != nullptr)
@@ -151,8 +156,8 @@ shared_ptr<Statement> Parser::matchStatementVariable() {
if (expression == nullptr || !expression->isValid())
return matchStatementInvalid();
// Expect new line
if (!tryMatchingTokenKinds({TokenKind::NEW_LINE}, false, true))
// Expect comma or new line
if (!tryMatchingTokenKinds({TokenKind::COMMA}, true, false) && !tryMatchingTokenKinds({TokenKind::NEW_LINE}, false, true))
return matchStatementInvalid("Expected a new line after variable declaration");
return make_shared<StatementVariable>(identifierToken->getLexme(), valueType, expression);
@@ -174,6 +179,50 @@ shared_ptr<Statement> Parser::matchStatementReturn() {
return make_shared<StatementReturn>(expression);
}
shared_ptr<Statement> Parser::matchStatementLoop() {
if (!tryMatchingTokenKinds({TokenKind::REPEAT}, true, true))
return nullptr;
// initial
shared_ptr<Statement> initStatement = matchStatementVariable();
if (initStatement != nullptr && !initStatement->isValid())
initStatement = nullptr;
// got initial, expect comma
if (initStatement != nullptr && !tryMatchingTokenKinds({TokenKind::COMMA}, true, true))
return matchStatementInvalid("Expected comma after initial statement");
// pre condition
shared_ptr<Expression> preConditionExpression = nextExpression();
if (preConditionExpression == nullptr || !preConditionExpression->isValid())
return matchStatementInvalid("Expected pre-condition expression");
// post condition
shared_ptr<Expression> postConditionExpression;
if (tryMatchingTokenKinds({TokenKind::COMMA}, true, true)) {
postConditionExpression = nextExpression();
if (postConditionExpression == nullptr || !postConditionExpression->isValid())
return matchStatementInvalid("Expected post-condition expression");
}
// epxect new line
if (!tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true))
return matchStatementInvalid("Expected new line");
// body
shared_ptr<Statement> bodyBlockStatement = matchStatementBlock({TokenKind::SEMICOLON}, true);
if (bodyBlockStatement == nullptr)
return matchStatementInvalid("Expected block statement");
else if (!bodyBlockStatement->isValid())
return bodyBlockStatement;
// epxect new line
if (!tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true))
return matchStatementInvalid("Expected new line");
return make_shared<StatementLoop>(initStatement, preConditionExpression, postConditionExpression, dynamic_pointer_cast<StatementBlock>(bodyBlockStatement));
}
shared_ptr<Statement> Parser::matchStatementExpression() {
shared_ptr<Expression> expression = nextExpression();