Initial commit: it compiles?

model/update.go

@@ -0,0 +1,99 @@
+package model
+
+func (m Model) update() Model {
+	// Reset sections to all true
+	m.sections = m.section*m.section - 1
+
+	// Update correctness/sections
+	for i := 0; i < m.size*m.size; i++ {
+		cell := m.field & i
+		marked := m.marks & i
+		flagged := m.flags & i
+
+		// Update the correctness of each cell
+		m.correct |= (cell & marked) | (flagged &^ cell)
+
+		// Update the correctness of each section
+		cellSection := ((i / (m.section * m.size)) * m.section) + (i/m.perSection)%m.section
+		m.sections &= m.correct & cellSection
+	}
+
+	// Check for complete sections, which are those where the row and column are both correct
+	completedIndices := map[int]bool{}
+	for i := 0; i < m.section*m.section; i++ {
+		if m.sections&i == 0 {
+			continue
+		}
+		mask := 0
+		x := i % m.section
+		y := i / m.section
+		for j := 0; j < m.section; j++ {
+			mask |= 1<<x + (j * m.section)
+			mask |= 1<<y + j
+		}
+		if m.sections&mask == mask {
+			completedIndices[i] = true
+		}
+	}
+
+	// Check for clears
+	clearedIndices := map[int]bool{}
+	clearedIncrease := 0
+	for i, _ := range completedIndices {
+		x := i % m.section
+		y := i / m.section
+
+		right := x + 1
+		if right == m.section {
+			right = -1
+		}
+
+		down := m.section
+		if y+1 == m.section {
+			down = -m.section
+		}
+
+		_, okRight := completedIndices[i+right]
+		_, okDown := completedIndices[i+down]
+		_, okDownRight := completedIndices[i+right+down]
+		if okRight && okDown && okDownRight {
+			clearedIndices[i] = true
+			clearedIndices[i+right] = true
+			clearedIndices[i+down] = true
+			clearedIndices[i+down+right] = true
+			clearedIncrease++
+			m.completed |= 1 << i
+			m.completed |= 1<<i + right
+			m.completed |= 1<<i + down
+			m.completed |= 1<<i + down + right
+		}
+	}
+
+	// Clear and bump scores
+	for i, _ := range clearedIndices {
+		m = m.randomizeSection(i)
+	}
+	if clearedIncrease > 0 {
+		m.score += clearedIncrease * (m.factor + 1)
+		m.clears++
+	}
+
+	// Check for blackout
+	if m.completed == m.section*m.section-1 {
+		m.completed = 0
+		m.factor++
+	}
+
+	// Update row/column states/correctness
+	for x := 0; x < m.size; x++ {
+		rowCorrect := true
+		columnCorrect := true
+		for y := 0; y < m.size; y++ {
+			cellCorrect := m.correct&y*m.size+x != 0
+			rowCorrect = rowCorrect && cellCorrect
+			columnCorrect = columnCorrect && cellCorrect
+		}
+	}
+
+	return m
+}