Function expression state with expression stack: expr_stack values: value_stack line: line tab: tab

the expression state (expr_state) stores information needed to continue expression evaluation after a child expression is computed, including the various stacks and the location (line and tab) of the expression

Format:

expression state with expression stack: expr_stack values: value_stack line: line tab: tab

Input:

Output:

Conditional properties that reference this function:

• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab k = s
  • k < j
  • value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
  • Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

  then Variables Map at time (t + 1) = varis

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab k = s
  • k < j
  • value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
  • Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

  then the line at time (t + 1) = line

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab k = s
  • k < j
  • value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
  • Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

  then the tab at time (t + 1) = tab

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab k = s
  • k < j
  • value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
  • Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

  then Expression Stack at time (t + 1) = expr_stack

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab k = s
  • k < j
  • value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
  • Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

  then Context Stack at time (t + 1) = rest

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab k = s
  • k < j
  • value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
  • Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

  then Value Stack at time (t + 1) = value_stack

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab k = s
  • k < j
  • value at (j - 1) in map (Control Map at time t) = pair ("method", mname)
  • Context Stack at time t = [ program context with variables: varis and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]

  then Control Map at time (t + 1) = control_map

  (link)
• if Parameters List at time t = [ ], then Context Stack at time (t + 1) = [ program context with variables: (Variables Map at time t) and expression state: (expression state with expression stack: (Expression Stack at time t) values: (Value Stack at time t) line: (the line at time t) tab: (the tab at time t)) and control map: (Control Map at time t), Context Stack at time t ] (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = return rex
  • Context Stack at time t = [ program context with variables: vars and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]
  • Expression Stack at time t = [ [ ], [ ] ]

  then Variables Map at time (t + 1) = vars

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = return rex
  • Context Stack at time t = [ program context with variables: vars and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]
  • Expression Stack at time t = [ [ ], [ ] ]

  then the line at time (t + 1) = line

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = return rex
  • Context Stack at time t = [ program context with variables: vars and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]
  • Expression Stack at time t = [ [ ], [ ] ]

  then the tab at time (t + 1) = tab

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = return rex
  • Context Stack at time t = [ program context with variables: vars and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]
  • Expression Stack at time t = [ [ ], [ ] ]

  then Control Map at time (t + 1) = control_map

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = return rex
  • Context Stack at time t = [ program context with variables: vars and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]
  • Expression Stack at time t = [ [ ], [ ] ]

  then Context Stack at time (t + 1) = rest

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = return rex
  • Context Stack at time t = [ program context with variables: vars and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]
  • Expression Stack at time t = [ [ ], [ ] ]

  then Expression Stack at time (t + 1) = expr_stack

  (link)
• if the following are true:
  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = return rex
  • Context Stack at time t = [ program context with variables: vars and expression state: (expression state with expression stack: expr_stack values: value_stack line: line tab: tab) and control map: control_map, rest ]
  • Expression Stack at time t = [ [ ], [ ] ]

  then Value Stack at time (t + 1) = value_stack

  (link)

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