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doc: tut2: simplify debug macro example

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Simon Ruderich 2016-09-15 04:21:25 +02:00
commit 6a0d288cae
1 changed files with 5 additions and 4 deletions
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doc/tut2.rst
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@ -674,17 +674,18 @@ variable number of arguments:
macro debug(n: varargs[expr]): stmt = macro debug(n: varargs[expr]): stmt =
# `n` is a Nim AST that contains a list of expressions; # `n` is a Nim AST that contains a list of expressions;
# this macro returns a list of statements: # this macro returns a list of statements (n is passed for proper line
# information):
result = newNimNode(nnkStmtList, n) result = newNimNode(nnkStmtList, n)
# iterate over any argument that is passed to this macro: # iterate over any argument that is passed to this macro:
for i in 0..n.len-1: for x in n:
# add a call to the statement list that writes the expression; # add a call to the statement list that writes the expression;
# `toStrLit` converts an AST to its string representation: # `toStrLit` converts an AST to its string representation:
result.add(newCall("write", newIdentNode("stdout"), toStrLit(n[i]))) result.add(newCall("write", newIdentNode("stdout"), toStrLit(x)))
# add a call to the statement list that writes ": " # add a call to the statement list that writes ": "
result.add(newCall("write", newIdentNode("stdout"), newStrLitNode(": "))) result.add(newCall("write", newIdentNode("stdout"), newStrLitNode(": ")))
# add a call to the statement list that writes the expressions value: # add a call to the statement list that writes the expressions value:
result.add(newCall("writeLine", newIdentNode("stdout"), n[i])) result.add(newCall("writeLine", newIdentNode("stdout"), x))
var var
a: array[0..10, int] a: array[0..10, int]