Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/string_utils.cc

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "tools/gn/string_utils.h"
-
-#include "tools/gn/err.h"
-#include "tools/gn/scope.h"
-#include "tools/gn/token.h"
-#include "tools/gn/tokenizer.h"
-#include "tools/gn/value.h"
-
-namespace {
-
-// Constructs an Err indicating a range inside a string. We assume that the
-// token has quotes around it that are not counted by the offset.
-Err ErrInsideStringToken(const Token& token, size_t offset, size_t size,
-                         const std::string& msg,
-                         const std::string& help = std::string()) {
-  // The "+1" is skipping over the " at the beginning of the token.
-  Location begin_loc(token.location().file(),
-                     token.location().line_number(),
-                     token.location().char_offset() + offset + 1);
-  Location end_loc(token.location().file(),
-                   token.location().line_number(),
-                   token.location().char_offset() + offset + 1 + size);
-  return Err(LocationRange(begin_loc, end_loc), msg, help);
-}
-
-// Given the character input[i] indicating the $ in a string, locates the
-// identifier and places its range in |*identifier|, and updates |*i| to
-// point to the last character consumed.
-//
-// On error returns false and sets the error.
-bool LocateInlineIdenfitier(const Token& token,
-                            const char* input, size_t size,
-                            size_t* i,
-                            base::StringPiece* identifier,
-                            Err* err) {
-  size_t dollars_index = *i;
-  (*i)++;
-  if (*i == size) {
-    *err = ErrInsideStringToken(token, dollars_index, 1, "$ at end of string.",
-        "I was expecting an identifier after the $.");
-    return false;
-  }
-
-  bool has_brackets;
-  if (input[*i] == '{') {
-    (*i)++;
-    if (*i == size) {
-      *err = ErrInsideStringToken(token, dollars_index, 2,
-          "${ at end of string.",
-          "I was expecting an identifier inside the ${...}.");
-      return false;
-    }
-    has_brackets = true;
-  } else {
-    has_brackets = false;
-  }
-
-  // First char is special.
-  if (!Tokenizer::IsIdentifierFirstChar(input[*i])) {
-    *err = ErrInsideStringToken(
-        token, dollars_index, *i - dollars_index + 1,
-        "$ not followed by an identifier char.",
-        "It you want a literal $ use \"\\$\".");
-    return false;
-  }
-  size_t begin_offset = *i;
-  (*i)++;
-
-  // Find the first non-identifier char following the string.
-  while (*i < size && Tokenizer::IsIdentifierContinuingChar(input[*i]))
-    (*i)++;
-  size_t end_offset = *i;
-
-  // If we started with a bracket, validate that there's an ending one. Leave
-  // *i pointing to the last char we consumed (backing up one).
-  if (has_brackets) {
-    if (*i == size) {
-      *err = ErrInsideStringToken(token, dollars_index, *i - dollars_index,
-                                  "Unterminated ${...");
-      return false;
-    } else if (input[*i] != '}') {
-      *err = ErrInsideStringToken(token, *i, 1, "Not an identifier in string expansion.",
-          "The contents of ${...} should be an identifier. "
-          "This character is out of sorts.");
-      return false;
-    }
-    // We want to consume the bracket but also back up one, so *i is unchanged.
-  } else {
-    (*i)--;
-  }
-
-  *identifier = base::StringPiece(&input[begin_offset],
-                                  end_offset - begin_offset);
-  return true;
-}
-
-bool AppendIdentifierValue(Scope* scope,
-                           const Token& token,
-                           const base::StringPiece& identifier,
-                           std::string* output,
-                           Err* err) {
-  const Value* value = scope->GetValue(identifier, true);
-  if (!value) {
-    // We assume the identifier points inside the token.
-    *err = ErrInsideStringToken(
-        token, identifier.data() - token.value().data() - 1, identifier.size(),
-        "Undefined identifier in string expansion.",
-        std::string("\"") + identifier + "\" is not currently in scope.");
-    return false;
-  }
-
-  output->append(value->ToString());
-  return true;
-}
-
-}  // namespace
-
-bool ExpandStringLiteral(Scope* scope,
-                         const Token& literal,
-                         Value* result,
-                         Err* err) {
-  DCHECK(literal.type() == Token::STRING);
-  DCHECK(literal.value().size() > 1);  // Should include quotes.
-  DCHECK(result->type() == Value::STRING);  // Should be already set.
-
-  // The token includes the surrounding quotes, so strip those off.
-  const char* input = &literal.value().data()[1];
-  size_t size = literal.value().size() - 2;
-
-  std::string& output = result->string_value();
-  output.reserve(size);
-  for (size_t i = 0; i < size; i++) {
-    if (input[i] == '\\') {
-      if (i < size - 1) {
-        switch (input[i + 1]) {
-          case '\\':
-          case '"':
-          case '$':
-            output.push_back(input[i + 1]);
-            i++;
-            continue;
-          default:  // Everything else has no meaning: pass the literal.
-            break;
-        }
-      }
-      output.push_back(input[i]);
-    } else if (input[i] == '$') {
-      base::StringPiece identifier;
-      if (!LocateInlineIdenfitier(literal, input, size, &i, &identifier, err))
-        return false;
-      if (!AppendIdentifierValue(scope, literal, identifier, &output, err))
-        return false;
-    } else {
-      output.push_back(input[i]);
-    }
-  }
-  return true;
-}
-
-std::string RemovePrefix(const std::string& str, const std::string& prefix) {
-  CHECK(str.size() >= prefix.size() &&
-        str.compare(0, prefix.size(), prefix) == 0);
-  return str.substr(prefix.size());
-}