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Linux & OSX: Build with clang


An interpreter of lua-like language written in C++ 11.


cmake -G "Unix Makefiles"


cmake -G Xcode


Global function Description
print(...) Print values to stdout
puts(string) Print a string to stdout
ipairs(table) Returns a iterator to iterate array part of a table
pairs(table) Returns a iterator to iterate a table(array and hash)
type(value) Returns type of a value
getline() Returns a line string which gets from stdin
require(path) Load the path module
IO table Description [, mode]) Returns a file of path by mode when open success, otherwise returns nil and error description, mode is same with c function fopen, default is "r".
io.stdin() Returns a file of stdin
io.stdout() Returns a file of stdout
io.stderr() Returns a file of stderr
File table Description
file:close() Close file
file:flush() Flush write buffer
file:read(...) Read data from file, arguments could be number(read number bytes, returns as a string), "*n"(read a number and returns the number), "*a"(read whole file, returns as a string. Returns a empty string when on the end of file), "*l"(read a line, returns as a string without '\n'), "*L"(read a line, returns as a string with '\n'). Returns nil when on end of file.
file:seek([whence [, offset]]) Sets and gets the file position. whence could be "set", "cur", "end", offset is a number. If seek success, then returns the file position, otherwise returns nil and error description. Called with no argument, returns current position.
file:setvbuf(mode [, size]) Set the buffering mode for the output file. mode could be "no"(no buffering), "full"(full buffering), "line"(line buffering), size is a number specifies the size of the buffer, in bytes.
file:write(...) Write the value of each argument to file, arguments could be string and number. If success, returns the file, otherwise returns nil and error description.
Math table Description
math.abs(x) Same with c function abs
math.acos(x) Same with c function acos
math.asin(x) Same with c function asin
math.atan(x) Same with c function atan
math.atan2(y, x) Same with c function atan2
math.ceil(x) Same with c function ceil
math.cos(x) Same with c function cos
math.cosh(x) Same with c function cosh
math.deg(x) Returns the angle x(given in radians) in degrees.
math.exp(x) Same with c function exp
math.floor(x) Same with c function floor
math.frexp(x) Same with c function frexp, returns significand of the given number in range of [0.5, 1) and exponent.
math.huge The c macro HUGE_VAL
math.ldexp(m, e) Same with c function ldexp
math.log(x [, base]) Same with c function log, the default for base is e.
math.max(x, ...) Returns the maximum value
math.min(x, ...) Returns the minimum value
math.modf(x) Returns the integral part of x and the fractional part of x.
math.pi The value of PI
math.pow(x, y) Same with c function pow
math.rad(x) Returns the angle(given in degrees) in radians.
math.random([m [, n]]) Returns a uniform pseudo-random number. When called with no arguments, returns a real number in the range [0, 1). When called with number m, returns a integer in the range [1, m]. When called with number m and n, returns a integer in the range [m, n].
math.randomseed(x) Set x as the seed for the pseudo-random generator.
math.sin(x) Same with c function sin
math.sinh(x) Same with c function sinh
math.sqrt(x) Same with c function sqrt
math.tan(x) Same with c function tan
math.tanh(x) Same with c function tanh
String table Description
string.byte(s [, i [, j]]) Returns the numerical codes of the characters s[i] to s[j]. The default value for i is 1.
string.char(...) Returns a string with length equal to the number of arguments, in which each character has the numerical code equal to its corresponding argument.
string.len(s) Returns the length of the string s.
string.lower(s) Returns a string in which each character is lowercase.
string.upper(s) Returns a string in which each character is uppercase.
string.reverse(s) Returns a reverse string of the string s.
string.sub(s, i [, j]) Returns the substring of s[i..j].
Table table Description
table.concat(t [, sep [, i [, j]]]) Concatenate t[i] .. t[j] to a string, insert sep between two elements, the default values for i is 1, j is #t, sep is an empty string.
table.insert(t, [pos ,] value) Insert the value at position pos, by default, the value append to the table t. Returns true when insert success.
table.pack(...) Pack all arguments into a table and returns it.
table.remove(t [, pos]) Remove the element at position pos, by default, remove the last element. Returns true when remove success.
table.unpack(t [, i [, j]]) Returns t[i] .. t[j] elements of table t, the default for i is 1, the default for j is #t.


A toy interpreter of lua-like language







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