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41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
#ifndef SHARED_EXPRESSION_MODEL_H
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#define SHARED_EXPRESSION_MODEL_H
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#include <poincare/expression.h>
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#include <poincare/context.h>
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#include <poincare/layout.h>
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#include <kandinsky.h>
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#include <escher.h>
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namespace Shared {
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class ExpressionModel {
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public:
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ExpressionModel();
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const char * text() const;
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Poincare::Expression expression(Poincare::Context * context) const;
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Poincare::Layout layout();
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/* Here, isDefined is the exact contrary of isEmpty. However, for Sequence
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* inheriting from ExpressionModel, isEmpty and isDefined have not exactly
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* opposite meaning. For instance, u(n+1)=u(n) & u(0) = ... is not empty and
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* not defined. We thus have to keep both methods. */
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virtual bool isDefined();
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virtual bool isEmpty();
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virtual bool shouldBeClearedBeforeRemove() {
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return !isEmpty();
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}
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virtual void setContent(const char * c);
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virtual void tidy();
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constexpr static int k_expressionBufferSize = TextField::maxBufferSize();
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private:
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constexpr static size_t k_dataLengthInBytes = (TextField::maxBufferSize())*sizeof(char);
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static_assert((k_dataLengthInBytes & 0x3) == 0, "The expression model data size is not a multiple of 4 bytes (cannot compute crc)"); // Assert that dataLengthInBytes is a multiple of 4
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char m_text[k_expressionBufferSize];
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mutable Poincare::Expression m_expression;
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mutable Poincare::Layout m_layout;
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};
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}
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#endif
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