Function parseExpression

python/text_generator.py:225–263

(lhs, tokens, currentIndex, minPrecedence)

def parseExpression(lhs, tokens, currentIndex, minPrecedence):
    if currentIndex >= len(tokens):
        return [lhs, currentIndex]

    lookahead = tokens[currentIndex]
    while (
        lookahead is not None
        and lookahead["type"] == "PYTHON_BINARY_OPERATOR"
        and getBinaryPrecedence(lookahead["properties"]["operator"]) >= minPrecedence
    ):
        operator = lookahead["properties"]["operator"]
        operatorPrecedence = getBinaryPrecedence(operator)
        currentIndex += 1
        rhs, currentIndex = parseLeaf(tokens, currentIndex)
        if currentIndex < len(tokens):
            lookahead = tokens[currentIndex]
            while (
                lookahead is not None
                and lookahead["type"] == "PYTHON_BINARY_OPERATOR"
                and getBinaryPrecedence(lookahead["properties"]["operator"]) > operatorPrecedence
            ):
                lookaheadOp = lookahead["properties"]["operator"]
                [rhs, currentIndex] = parseExpression(
                    rhs, tokens, currentIndex, getBinaryPrecedence(lookaheadOp)
                )
                if currentIndex < len(tokens):
                    lookahead = tokens[currentIndex]
                else:
                    lookahead = None
        else:
            lookahead = None
        if isBoolOp(operator):
            lhs = ast.BoolOp(getAstOperator(operator), [lhs, rhs])
        elif isCompareOp(operator):
            # TODO: Support mutiple comparators, e.g. a < b < c
            lhs = ast.Compare(lhs, [getAstOperator(operator)], [rhs])
        else:
            lhs = ast.BinOp(lhs, getAstOperator(operator), rhs)
    return [lhs, currentIndex]


def generateAstExpression(exp_node):