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grammar.txt
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grammar.txt
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program
[program-heading] block `.`
program-heading
`program` identifier
block
declaration-part statement-part
declaration-part
[constant-definition-part] | [var-definition-part]
var-definition-part
`var` var-definition `;`
constant-definition-part
`const` constant-definition `;`
var-definition
identifier-list `:` type
type
range | built-in-type | type-identifier | array-type
array-type
`array` `[` range {`,` range} `]` `of` type
type-identifier
identifier
range
integer `..` integer
identifier-list
identifier {`,` identifier}
constant-definition
identifier `=` constant-expression
statement-part
`begin` statement-sequence `end`
statement-sequence
statement {`;` statement}
statement
(simple-statement | structured-statement)
simple-statement
[assingment-statement | procedure-statement]
procedure-statement
identifier [actual-parameter-list]
actual-parameter-list
`(` actual-parameter {`,` actual-parameter} `)`
constant-actual-parameter-list
`(` constant-actual-parameter {`,` constant-actual-parameter} `)`
actual-parameter
expression | variable | identifier
constant-actual-parameter
constant-expression | constant-entire-variable
structured-statement
compound-statement | repititive-statement | if-statement
if-statement
`if` expression `then` statement [`else` statement]
repeatitive-statement
while-statement | repeat-statement | for-statement
for-statement
`for` identifier `:=` expression (`to` | `downto`) expression `do` statement
while-statement
`while` expression `do` statement
repeat-statement
`repeat` statement-sequence `until` expression
compound-statement
`begin` statement-sequence `end`
assingment-statement
variable `:=` expression
expression
simple-expression [relational-operator simple-expression]
constant-expression
simple-constant-expression [relational-operator simple-constant-expression]
simple-expression
term {addition-operator term}
simple-constant-expression
constant-term {addition-operatop constant-term}
addition-operator
`+` | `-` | `or`
multiplication-operator
`*` | `/` | `div` | `mod` | `and`
term
factor {multiplication-operator factor}
constant-term
constant-factor {multiplication-operator constant-factor}
factor
variable | number | string | `nil` | function-designator
constant-factor
constant-factor | number | string | `nil` | function-designator-from-const
function-designator
identifier [ actual-parameter-list ]
function-designator-from-const
identifier [ constant-actual-parameter-list ]
variable
entire-variable | component-variable
component-variable
indexed-variable | field-designator
field-designator
identifier `.` variable
indexed-varialbe
identifier `[` expression-list `]`
expression-list
expression {`,` expression}
entire-variable
identifier
identifier
letter {letter|digit}
letter
`A` | `B` | `C` | `D` | `E` | `F` | `G` | `H` | `I` | `J` | `K` | `L` | `M` | `N` | `O` | `P` | `Q` | `R` | `S` | `T` | `U` | `V` | `W` | `X` | `Y` | `Z` | `a` | `b` | `c` | `d` | `e` | `f` | `g` | `h` | `i` | `j` | `k` | `l` | `m` | `n` | `o` | `p` | `q` | `r` | `s` | `t` | `u` | `v` | `w` | `x` | `y` | `z`
digit
`0` | `1` | `2` | `3` | `4` | `5` | `6` | `7` | `8` | `9`
relational-operator
`=` | `<>` | `<` | `<=` | `>` | `>=` | `in`